LTspice is a

SPICE In the culinary arts, a spice is any seed, fruit, root, Bark (botany), bark, or other plant substance in a form primarily used for flavoring or coloring food. Spices are distinguished from herbs, which are the leaves, flowers, or stems of pl ...

-based

analog Analog or analogue may refer to: Computing and electronics * Analog signal, in which information is encoded in a continuous variable ** Analog device, an apparatus that operates on analog signals *** Analog electronics, circuits which use analog ...

electronic circuit simulator computer software, produced by

semiconductor A semiconductor is a material with electrical conductivity between that of a conductor and an insulator. Its conductivity can be modified by adding impurities (" doping") to its crystal structure. When two regions with different doping level ...

manufacturer

Analog Devices Analog Devices, Inc. (ADI), also known simply as Analog, is an American multinational corporation, multinational semiconductor company specializing in data conversion, signal processing, and power management technology, headquartered in Wilming ...

(originally by

Linear Technology Linear Technology Corporation was an American semiconductor company that designed, manufactured and marketed high performance analog integrated circuits. Applications for the company's products included telecommunications, cellular telephones, ne ...

). It is the most widely distributed and used SPICE software in the industry. Though it is

freeware Freeware is software, often proprietary, that is distributed at no monetary cost to the end user. There is no agreed-upon set of rights, license, or EULA that defines ''freeware'' unambiguously; every publisher defines its own rules for the free ...

,Mike Engelhardt: ''LTspice IV Help → F.A.Q. → License and Distribution.'' (Help of software version 4.19u of 4 September 2013)Mike Engelhardt: ''LTspice IV Help → Introduction → License Agreement/Disclaimer.'' (Help of software version 4.19u of 4 September 2013) it is not artificially restricted to limit its abilities (no limits on: features, nodes, components, subcircuits). It ships with a

library A library is a collection of Book, books, and possibly other Document, materials and Media (communication), media, that is accessible for use by its members and members of allied institutions. Libraries provide physical (hard copies) or electron ...

of SPICE models from

Maxim Integrated Maxim Integrated Products, Inc., was an American semiconductor company that designed, manufactured, and sold analog and mixed-signal integrated circuits for the automotive, industrial, communications, consumer, and computing markets. Maxim's pr ...

, and third-party sources.

Overview

LTspice provides

schematic capture Schematic capture or schematic entry is a step in the design cycle of electronic design automation (EDA) at which the electronic diagram, or electronic schematic of the designed electronic circuit, is created by a designer. This is done interac ...

to enter an electronic schematic for an

electronic circuit An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or Conductive trace, traces through which electric current can flow. It is a t ...

, an enhanced

type analog electronic circuit

simulator A simulation is an imitative representation of a process or system that could exist in the real world. In this broad sense, simulation can often be used interchangeably with model. Sometimes a clear distinction between the two terms is made, in ...

, and a

waveform viewer A waveform viewer is a software tool for viewing the signal levels of either a digital circuit, digital or analog circuit design.Janick Bergeron, ''Writing Testbenches: Functional verification of HDL Models'', Kluwer Academic Publishers, 2000 Wave ...

to show the results of the simulation. Circuit simulation analysis based on transient, noise, AC, DC, DC transfer function, DC operating point can be performed and plotted as well as fourier analysis. Heat dissipation of components can be calculated and efficiency reports can also be generated. It has enhancements and specialized models to speed the simulation of

switched-mode power supplies A switched-mode power supply (SMPS), also called switching-mode power supply, switch-mode power supply, switched power supply, or simply switcher, is an electronic power supply that incorporates a switching regulator to convert electrical powe ...

(SMPS) in

DC-to-DC converter A DC-to-DC converter is an electronic circuit or electromechanical device that converts a source of direct current (DC) from one voltage level to another. It is a type of Electric power conversion, electric power converter. Power levels range from ...

s. LTspice does not generate

printed circuit board A printed circuit board (PCB), also called printed wiring board (PWB), is a Lamination, laminated sandwich structure of electrical conduction, conductive and Insulator (electricity), insulating layers, each with a pattern of traces, planes ...

(PCB) layouts, but netlists can be exported to PCB layout software. While LTspice does support simple logic gate simulation, it is not designed specifically for simulating logic circuits. It is used by many users in fields including

radio frequency Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around to around . This is roughly between the u ...

electronics,

power electronics Power electronics is the application of electronics to the control and conversion of electric power. The first high-power electronic devices were made using mercury-arc valves. In modern systems, the conversion is performed with semiconduct ...

audio electronics Audio most commonly refers to sound, as it is transmitted in signal form. It may also refer to: Sound *Audio signal, an electrical representation of sound * Audio frequency, a frequency in the audio spectrum *Digital audio, representation of soun ...

digital electronics Digital electronics is a field of electronics involving the study of digital signals and the engineering of devices that use or produce them. It deals with the relationship between Binary number, binary inputs and outputs by passing electrical s ...

, and other disciplines.

LTspice/SwitcherCAD III

In 1999, LTspice III was released, the first public release. It is designed to run on

Windows Windows is a Product lining, product line of Proprietary software, proprietary graphical user interface, graphical operating systems developed and marketed by Microsoft. It is grouped into families and subfamilies that cater to particular sec ...

95, 98, 98SE, ME, NT4.0, 2K, XP. This version is no longer available for download from Analog Devices. Initially, LTspice III was internally released to Linear Technology's Field Application Engineers (FAE) in October 1999, who then gave it away during customer visits via

CD-ROM A CD-ROM (, compact disc read-only memory) is a type of read-only memory consisting of a pre-pressed optical compact disc that contains computer data storage, data computers can read, but not write or erase. Some CDs, called enhanced CDs, hold b ...

media. In June 2001, it was released for public downloading from the Linear Technology website. Originally, LTspice/SwitcherCAD ran only on Microsoft Windows platforms, but since 2003 it is able to run under the

Wine Wine is an alcoholic drink made from Fermentation in winemaking, fermented fruit. Yeast in winemaking, Yeast consumes the sugar in the fruit and converts it to ethanol and carbon dioxide, releasing heat in the process. Wine is most often made f ...

Windows compatibility layer on

Linux Linux ( ) is a family of open source Unix-like operating systems based on the Linux kernel, an kernel (operating system), operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically package manager, pac ...

LTspice IV

In 2008, LTspice IV was released. It is designed to run on Windows 2K, XP, Vista, 7 with a processor that contains a minimum instruction set similar to a

Pentium 4 Pentium 4 is a series of single-core central processing unit, CPUs for Desktop computer, desktops, laptops and entry-level Server (computing), servers manufactured by Intel. The processors were shipped from November 20, 2000 until August 8, 20 ...

processor. Though IV is still available for download, it is no longer maintained. LTspice was originally called SwitcherCAD, but that name was removed when IV was released. A native Apple

macOS macOS, previously OS X and originally Mac OS X, is a Unix, Unix-based operating system developed and marketed by Apple Inc., Apple since 2001. It is the current operating system for Apple's Mac (computer), Mac computers. With ...

10.7+ application was introduced in 2013.

LTspice XVII

In 2016, LTspice XVII was released, and is currently the latest version. It is designed to run on 32-bit or 64-bit editions of

7, 8, 8.1, 10, and

10.9+. Summary of major changes from LTspice IV to LTspice XVII are: * Add 64-bit executables. * Add

Unicode Unicode or ''The Unicode Standard'' or TUS is a character encoding standard maintained by the Unicode Consortium designed to support the use of text in all of the world's writing systems that can be digitized. Version 16.0 defines 154,998 Char ...

characters in

schematic A schematic, or schematic diagram, is a designed representation of the elements of a system using abstract, graphic symbols rather than realistic pictures. A schematic usually omits all details that are not relevant to the key information the sc ...

netlist In electronic design, a netlist is a description of the connectivity of an electronic circuit. In its simplest form, a netlist consists of a list of the electronic components in a circuit and a list of the nodes they are connected to. A netwo ...

s, plot. * Add device equations for

IGBT An insulated-gate bipolar transistor (IGBT) is a three-terminal power semiconductor device primarily forming an electronic switch. It was developed to combine high efficiency with fast switching. It consists of four alternating layers (NPNP) that ...

, diode soft recovery, arbitrary

state machine A finite-state machine (FSM) or finite-state automaton (FSA, plural: ''automata''), finite automaton, or simply a state machine, is a mathematical model of computation. It is an abstract machine that can be in exactly one of a finite number o ...

. * Add user-defined symbol and library directory search path settings to the LTspice control panel. * Add schematic

thumbnail Thumbnails are reduced-size versions of pictures or videos, used to help in recognizing and organizing them, serving the same role for images as a normal text index does for words. In the age of digital images, visual search engines and image-o ...

and preview support on Microsoft Windows. * Add editors for most

commands. * Add

multi-monitor Multi-monitor, also called multi-display and multi-head, is the use of multiple physical display devices, such as Computer monitor, monitors, Television set, televisions, and Video projector, projectors, in order to increase the area available fo ...

support.

Updates

Every month, LTspice updates have been released with new SPICE models, fixed SPICE models, or software changes. At any time, a user can manually update LTspice by choosing "Sync Release" from the "Tools" pulldown menu. From the "Help" pulldown menu, "Show Change Log" displays a list of every SPICE model and software change since LTspice XVII was first released. In March 2017,

merged into

. Over time, SPICE models for Analog Devices components have gradually been added to LTspice. In August 2021,

merged with Analog Devices. Since then, SPICE models for Maxim components are being gradually added into LTspice. Updates are no longer provided for Windows XP and MacOS 10.9, as well as older versions of Windows and MacOS.

Device models

LTspice ships with thousands of third-party models (

capacitor In electrical engineering, a capacitor is a device that stores electrical energy by accumulating electric charges on two closely spaced surfaces that are insulated from each other. The capacitor was originally known as the condenser, a term st ...

diode A diode is a two-Terminal (electronics), terminal electronic component that conducts electric current primarily in One-way traffic, one direction (asymmetric electrical conductance, conductance). It has low (ideally zero) Electrical resistance ...

inductor An inductor, also called a coil, choke, or reactor, is a Passivity (engineering), passive two-terminal electronic component, electrical component that stores energy in a magnetic field when an electric current flows through it. An inductor typic ...

resistor A resistor is a passive two-terminal electronic component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active e ...

transistor A transistor is a semiconductor device used to Electronic amplifier, amplify or electronic switch, switch electrical signals and electric power, power. It is one of the basic building blocks of modern electronics. It is composed of semicondu ...

ferrite bead A ferrite beadalso called a ferrite block, ferrite core, ferrite ring, EMI filter, or ferrite chokeis a type of choke (electronics), choke that suppresses high-frequency electronic noise in electronic circuits. Ferrite beads employ high-frequen ...

opto-isolator An opto-isolator (also called an optocoupler, photocoupler, or optical isolator) is an electronic component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent high voltages from affecting the s ...

s, 555 timer, and more), as well as macro models for

and

parts ( ADCs, analog switches,

comparator In electronics, a comparator is a device that compares two voltages or currents and outputs a digital signal indicating which is larger. It has two analog input terminals V_+ and V_- and one binary digital output V_\text. The output is ideally ...

s, DACs, filters, opamps,

timer A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. It can also usually be stopped manually before the whole duration has elapsed. An example of a simple timer is an hourglass ...

voltage reference A voltage reference is an electronic device that ideally produces a fixed (constant) voltage irrespective of the loading on the device, power supply variations, temperature changes, and the passage of time. Voltage references are used in power sup ...

s, voltage supervisors,

voltage regulator A voltage regulator is a system designed to automatically maintain a constant voltage. It may use a simple feed-forward design or may include negative feedback. It may use an electromechanical mechanism or electronic components. Depending on the ...

s, 0.01% quad resistor networks, and more). In the device library, Analog Devices part numbers start with "AD", and Linear Technology parts start with "LT". LTspice allows a user to choose from device models that ship with LTspice, as well as allows the user to define their own device model, or use 3rd party models from numerous electronic component manufacturers, or use a model from a 3rd party device library. Starting with LTspice XVII, control panel settings were added to allow the user to specify search directories for 3rd party device symbols and libraries. See option setting at LTspice -> Tools -> Control Panel -> Sym. & Lib. Search Paths. The text that describes intrinsic SPICE models can be placed directly on an LTspice schematic by using the spice directive .op button. The advantage of this method is the 3rd party model is self-contained as part of the schematic when you distribute the schematic file. The same .model can also be copied to an

ASCII ASCII ( ), an acronym for American Standard Code for Information Interchange, is a character encoding standard for representing a particular set of 95 (English language focused) printable character, printable and 33 control character, control c ...

text file on your computer too, but it won't "travel" with a schematic when you copy it to another computer. For example, the following diode part numbers aren't included in the current LTspice device library: : .model 1N4004_WIKI D(Is=500p Rs=0.12 N=1.6 Tt=4u Cjo=40p M=0.35 BV=400 Ibv=5.00u Mfg=BobCordellBook Type=Silicon) :

.model  1N4007_WIKI D(Is=7.02767n Rs=0.0341512 N=1.80803 Tt=1e-07 Cjo=1e-11 Vj=0.7 M=0.5 Eg=1.05743 Xti=5 Fc=0.5 BV=1000 Ibv=5e-08 Mfg=OnSemiconductor Type=Silicon)

: .model 1N5408_WIKI D(Is=63.0n Rs=14.1m N=1.70 Tt=4.32u Cjo=53.0p M=0.333 BV=1000 Ibv=10.0u Mfg=DiodesInc Type=Silicon)

Number conventions

In LTspice, numeric values can be expressed in four different ways:

integer An integer is the number zero (0), a positive natural number (1, 2, 3, ...), or the negation of a positive natural number (−1, −2, −3, ...). The negations or additive inverses of the positive natural numbers are referred to as negative in ...

(i.e., 1000), real (i.e., 1000.0), scientific e-notation (i.e., 1e3, 1.0e3), scale factor notation (i.e., 1K, 1K0). If the first character after a number is not the letter "e" for scientific e-notation or a scale factor suffix (left column of table), then trailing characters are ignored. For example, 5 is treated the same as 5V, 5

Volt The volt (symbol: V) is the unit of electric potential, Voltage#Galvani potential vs. electrochemical potential, electric potential difference (voltage), and electromotive force in the International System of Units, International System of Uni ...

, 5Volts, 5 Hz, or 5

Hertz The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), often described as being equivalent to one event (or Cycle per second, cycle) per second. The hertz is an SI derived unit whose formal expression in ter ...

Scale factors

Integer and real numbers supports a scale factor (multiplier) suffix. These are based mostly on metric conventions. The suffix (left column) can be upper, lower, or mixed

case Case or CASE may refer to: Instances * Instantiation (disambiguation), a realization of a concept, theme, or design * Special case, an instance that differs in a certain way from others of the type Containers * Case (goods), a package of relate ...

, known as case insensitive. For example, 1MEG, 1meg, or 1Meg represents 1000000; 1k, or 1K represents 1000. Any appended text after the suffix (left column) is ignored. For example, 2Meg Hz, or 2Mega

Ohm Ohm (symbol Ω) is a unit of electrical resistance named after Georg Ohm. Ohm or OHM may also refer to: People * Georg Ohm (1789–1854), German physicist and namesake of the term ''ohm'' * Germán Ohm (born 1936), Mexican boxer * Jörg Ohm (1 ...

represents 2000000; 3m V, or 3mOhm represents 0.003; 4uF, or 4u

Henry Henry may refer to: People and fictional characters * Henry (given name), including lists of people and fictional characters * Henry (surname) * Henry, a stage name of François-Louis Henry (1786–1855), French baritone Arts and entertainmen ...

represents 0.000004. In LTspice, any suffix (left column) can replace the

decimal point FIle:Decimal separators.svg, alt=Four types of separating decimals: a) 1,234.56. b) 1.234,56. c) 1'234,56. d) ١٬٢٣٤٫٥٦., Both a comma and a full stop (or period) are generally accepted decimal separators for international use. The apost ...

of a

real number In mathematics, a real number is a number that can be used to measure a continuous one- dimensional quantity such as a duration or temperature. Here, ''continuous'' means that pairs of values can have arbitrarily small differences. Every re ...

, a common format for printed schematics. For example, 4K7 represents 4700, 1u8 represents 0.0000018.

Compatibility

Although LTspice was originally based upon Berkeley

3f5 source code, it no longer is, thus some of its features may create non-portable files. Competitor SPICE programs have non-portable features too. LTspice features that may not be supported by some SPICE programs: *

characters in schematics, netlists, plot. This is a new feature in LTspice XVII, thus older versions of LTspice don't support Unicode. * Unicode (U+00B5) µ

micro Micro may refer to: Measurement * micro- (μ), a metric prefix denoting a factor of 10−6 Places * Micro, North Carolina, town in U.S. People * DJ Micro, (born Michael Marsicano) an American trance DJ and producer * Chii Tomiya (都宮 � ...

character as an alternate symbol for ASCII (hex 75) u letter, which used as the micro (10⁻⁶) scale factor. See option setting at LTspice -> Tools -> Control Panel -> Netlist Options -> Convert 'µ' to 'u'. * Unicode (U+2212) −

minus The plus sign () and the minus sign () are mathematical symbols used to denote positive and negative functions, respectively. In addition, the symbol represents the operation of addition, which results in a sum, while the symbol represent ...

character as an alternate symbol for ASCII (hex 2D) − minus/dash/hyphen character. * Suffix replacing decimal point. See option setting at LTspice -> Tools -> Control Panel -> SPICE -> Accept 3K4 as 3.4K. LTspice does not support the following features: * LTspice does not support scale factors of "atto" 10⁻¹⁸, "peta" 10¹⁵, or "exa" 10¹⁸. * HSPICE supports 'a' for "atto" 10⁻¹⁸, which must be replaced with 'e-18' to be compatible with LTspice and other SPICE software. * HSPICE supports 'X' as a synonym for "meg" 10⁶, which must be replaced with 'e6' or 'MEG'to be compatible with LTspice and other SPICE software.

Node name conventions

In LTspice, a node/net (connection point) on the schematic can be labeled by using the Label Net tool button or F4 key. The "Label Net" wizard has three choices for a label, two predefined graphical symbols (GND, COM), or a user-defined node/net name. The two graphical symbols represent: * GND - The ground symbol assigns a node with a special global net name of "0". * COM - The COM symbol assigns a node with a net name of "COM", which has no special significance. Historically,

and older version of LTspice software only supported printable

characters for node/net names, then LTspice XVII added support for

characters. A user-defined name supports two optional features that can be prepended to the text name: * _ - An

underscore An underscore or underline is a line drawn under a segment of text. In proofreading, underscoring is a convention that says "set this text in italic type", traditionally used on manuscript or typescript as an instruction to the printer. Its ...

causes an

overbar An overline, overscore, or overbar, is a typographical feature of a horizontal line drawn immediately above the text. In old mathematical notation, an overline was called a '' vinculum'', a notation for grouping symbols which is expressed in ...

to be placed above the entire name, which commonly means an active low signal. For example, "_RESET" is shown on the schematic as "". * $G_ - This means a node is global, no matter where the name occurs in the circuit hierarchy. For example, "$G_ENABLE" / "$G_ERROR". The ground symbol is treated in a similar way, but it does not have "$G_" prepended to it. When a node/net name is placed on a schematic, it will have one of five different visual representations. Two are automatically determined, while three others are chosen by the "Port Type" field in the "Label Net" wizard. * None - Bare text. This is the default. * Global - "Rectangle" around the text. This is automatically shown for a global net name that starts with "$G_". * Input - "Rectangle with triangle end" around the text. This is chosen by the "Port Type" field in the "Label Net" wizard. * Output - "Rectangle with triangle on other end" around the text. This is chosen by the "Port Type" field in the "Label Net" wizard. * Bidirectional - "Rectangle with triangle on two ends" around the text. This is chosen by the "Port Type" field in the "Label Net" wizard.

File format

Many of the LTspice files are stored as an

text file A text file (sometimes spelled textfile; an old alternative name is flat file) is a kind of computer file that is structured as a sequence of lines of electronic text. A text file exists stored as data within a computer file system. In ope ...

, which can be viewed or edited with any ASCII

text editor A text editor is a type of computer program that edits plain text. An example of such program is "notepad" software (e.g. Windows Notepad). Text editors are provided with operating systems and software development packages, and can be used to c ...

program. One side benefit of an ASCII

file format A file format is a Computer standard, standard way that information is encoded for storage in a computer file. It specifies how bits are used to encode information in a digital storage medium. File formats may be either proprietary format, pr ...

is that a schematic can be listed in any printed document, such as book, magazine, datasheet, research paper, or homework assignment, which allows recreating LTspice files without electronic file distribution. LTspice

filename extension A filename extension, file name extension or file extension is a suffix to the name of a computer file (for example, .txt, .mp3, .exe) that indicates a characteristic of the file contents or its intended use. A filename extension is typically d ...

s:What are the different LTspice file types; LTwiki.
/ref> * .asc -

. It consists of a

based on

text-based commands. * .asy -

electronic symbol An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit. These symbols are ...

shown in a schematic. * .cir - external netlist input. * .fft - FFT binary output. * .lib - model library subcircuits. * .plt -

waveform In electronics, acoustics, and related fields, the waveform of a signal is the shape of its Graph of a function, graph as a function of time, independent of its time and Magnitude (mathematics), magnitude Scale (ratio), scales and of any dis ...

viewer plot settings. * .raw - binary output, optional ASCII output. * .sub - subcircuit.Subcircuit structure guide; Audio perfection.
/ref> * .lib / .sub / .mod / .model - device model. While any file extension is allowed, users tend to gravitate towards common ones.

Example

The following example can be viewed by copying each into two different text files. For each, copy the text in the gray box from this article, paste into an ASCII

, saving as a text file. Both files must have the same "base name" and sit in the same directory. To see it, opening the "asc" file with LTspice then click the "Run" button inside LTspice software. * LTspice_RC.asc * LTspice_RC.plt

Schematic file

LTspice

s are stored as an ASCII text file with a filename extension of "asc". The following example shows the contents from a small LTspice schematic file for a simple

RC circuit A resistor–capacitor circuit (RC circuit), or RC filter or RC network, is an electric circuit composed of resistors and capacitors. It may be driven by a voltage source, voltage or current source and these will produce different responses. A fi ...

with four schematic symbols: V1 is 10

volt The volt (symbol: V) is the unit of electric potential, Voltage#Galvani potential vs. electrochemical potential, electric potential difference (voltage), and electromotive force in the International System of Units, International System of Uni ...

DC voltage source, R1 is 1K

ohm Ohm (symbol Ω) is a unit of electrical resistance named after Georg Ohm. Ohm or OHM may also refer to: People * Georg Ohm (1789–1854), German physicist and namesake of the term ''ohm'' * Germán Ohm (born 1936), Mexican boxer * Jörg Ohm (1 ...

, C1 is 1 uF

, ground. The bottom three TEXT lines are: 1) a transient simulation directive with a stop time parameter of 10 ms (.tran 10mS), 2) a

directive to set the initial condition of RC "out" net to zero volts (.ic v(OUT)=0V), and 3) a text comment (title). Version 4 SHEET 1 880 680 WIRE 224 96 128 96 WIRE 128 160 128 96 WIRE 224 192 224 176 WIRE 288 192 224 192 WIRE 224 208 224 192 WIRE 128 288 128 240 WIRE 224 288 224 272 WIRE 224 288 128 288 WIRE 224 304 224 288 FLAG 224 304 0 FLAG 288 192 OUT IOPIN 288 192 Out SYMBOL res 208 80 R0 SYMATTR InstName R1 SYMATTR Value 1K SYMBOL cap 208 208 R0 SYMATTR InstName C1 SYMATTR Value 1uF SYMATTR SpiceLine V=50 SYMBOL voltage 128 144 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 0 7 10 Left 2 WINDOW 3 -20 57 Left 2 SYMATTR InstName V1 SYMATTR Value 10V TEXT 120 344 Left 2 !.tran 10mS TEXT 120 376 Left 2 !.ic v(OUT)=0V TEXT 8 72 Left 2; RC Circuit - LTspice - Wikipedia

Plot file

LTspice

viewer plot settings are stored as an ASCII text file with a filename extension of "plt". If this optional plot file is present, then all plot planes will automatically be displayed after the "Run" button is pressed, otherwise the user will need to click on each net to see the waveform(s). To create a plot file on Windows, after a plot graph is displayed, right-click on it and choose "File", then choose "Save Plot Settings".Save Plot Configurations; LTwiki.
/ref> The following example for the above schematic shows settings for a "transient analysis" simulation with two waveforms on one plot plane consisting of the RC

voltage Voltage, also known as (electrical) potential difference, electric pressure, or electric tension, is the difference in electric potential between two points. In a Electrostatics, static electric field, it corresponds to the Work (electrical), ...

at "out" net and

current Currents, Current or The Current may refer to: Science and technology * Current (fluid), the flow of a liquid or a gas ** Air current, a flow of air ** Ocean current, a current in the ocean *** Rip current, a kind of water current ** Current (hydr ...

through resistor R1, which are labeled V(out) and I(R1) at the top of the plot graph. ransient Analysis