An interposer is an electrical interface routing between one socket or connection and another. The purpose of an interposer is to spread a connection to a wider pitch or to reroute a connection to a different connection.
An interposer can be made of either silicon or organic (printed circuit board-like) material. Interposer comes from the Latin word , meaning "to put between".interposes - definition of interposes by the Free Online Dictionary, Thesaurus and Encyclopedia
They are often used in BGA packages,

multi-chip module A multi-chip module (MCM) is generically an electronic assembly (such as a package with a number of conductor terminals or Lead (electronics), "pins") where multiple integrated circuits (ICs or "chips"), semiconductor Die (integrated circuit), d ...

s and high-bandwidth memory. A common example of an interposer is an integrated circuit die to BGA, such as in the Pentium II. This is done through various substrates, both rigid and flexible, most commonly FR4 for rigid, and

polyimide Polyimide (sometimes abbreviated PI) is a monomer containing imide groups belonging to the class of high-performance plastics. With their high heat-resistance, polyimides enjoy diverse applications in roles demanding rugged organic materials, suc ...

for flexible. Silicon and glass are also evaluated as an integration method. Interposer stacks are also a widely accepted, cost-effective alternative to 3D ICs. There are already several products with interposer technology in the market, notably the AMD Fiji/Fury GPU, and the Xilinx Virtex-7 FPGA. In 2016, CEA Leti demonstrated their second-generation 3D- NoC technology, which combines small dies ("chiplets"), fabricated at the FDSOI 28 nm node, on a 65 nm

CMOS Complementary metal–oxide–semiconductor (CMOS, pronounced "sea-moss ", , ) is a type of MOSFET, metal–oxide–semiconductor field-effect transistor (MOSFET) semiconductor device fabrication, fabrication process that uses complementary an ...

interposer. Another example of an interposer is the adapter used to plug a

SATA SATA (Serial AT Attachment) is a computer bus interface that connects host bus adapters to mass storage devices such as hard disk drives, optical drives, and solid-state drives. Serial ATA succeeded the earlier Parallel ATA (PATA) standard ...

drive into a SAS backplane with redundant ports. While SAS drives have two ports that can be used to connect to redundant paths or storage controllers, SATA drives only have a single port. Directly, they can only connect to a single controller or path. SATA drives can be connected to nearly all SAS backplanes without adapters, but using an interposer with a port-switching logic allows providing path redundancy.

References

Integrated circuits {{electronics-stub

See also

References