Chip socket - Revision history

Jnc: copy edit

2018-12-16T15:37:05Z

copy edit

Jnc: +cat

2018-12-14T18:58:11Z

+cat

Jnc: A pretty good start

2018-10-27T01:02:16Z

A pretty good start

New page

A '''chip socket''' (usually plain '''socket''') is a device which can hold an [[integrated circuit]] and allow it to make electrical contact on all the pins of [[Dual Inline Package|DIPs]].

Use of sockets allows failed chips to be easily removed and replaced; for this reason they are often found on [[dynamic RAM|DRAM]] [[main memory]] boards. However, some manufacturers, such as [[Digital Equipment Corporation|DEC]], eschewed them, probably for a mix of reasons:

* Cost (sockets do not provide any additional functionality, but increase the parts cost).
* The potential for bad contacts between the pins on the chip, and the socket (on older boards, it is common to have to remove and replace chips to clear poor contact caused by corrosion).
* Companies which had a large [[field service]] organizations would be better set up to take in 'broken' boards and repair them; allowing the customers to repair boards by chip replacement would make life easier for small manufacturers.

On DRAM boards, socketing the memory chips also allowed upgrading the boards when larger DRAM chips came out. A number of boards (e.g. the [[National Semiconductor]] [[National Semiconductor NS23C QBUS memory|NS23C]] and [[National Semiconductor NS23M QBUS memory|NS23M]] memory cards.

Sockets are often found on large chips, even on boards from manufacturers which didn't use them much; whether this is because it limited the chances of damaging them with heat when soldering them in, or because it's harder to remove large chips to replace them if/when they fail, is unclear.

Boards made using [[wire-wrap]] usually have all their chips in sockets; the wire-wrap pins come straight out of the socket, with no intermediary.

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-A '''chip socket''' (usually plain '''socket''') is a device which can hold an [[integrated circuit]] and allow it to make electrical contact on all the pins of [[Dual Inline Package|DIPs]].
+A '''chip socket''' (usually plain '''socket''') is a device which can hold an [[integrated circuit]] chip and allow it to make electrical contact on all the pins of the chip plugged into it. They are commonly used to hold [[Dual Inline Package|DIPs]], but sockets exist for other packaging formats as well.
-Use of sockets allows failed chips to be easily removed and replaced; for this reason they are often found on [[dynamic RAM|DRAM]] [[main memory]] boards. However, some manufacturers, such as [[Digital Equipment Corporation|DEC]], eschewed them, probably for a mix of reasons:
+Use of sockets allows failed chips to be easily removed and replaced; for this reason they are often found on [[Dynamic RAM|DRAM]] [[main memory]] boards. However, some manufacturers, such as [[Digital Equipment Corporation|DEC]], eschewed them, probably for a mix of reasons:
 * Cost (sockets do not provide any additional functionality, but increase the parts cost).
@@ Line 7: / Line 7: @@
 * Companies which had a large [[field service]] organizations would be better set up to take in 'broken' boards and repair them; allowing the customers to repair boards by chip replacement would make life easier for small manufacturers.
-On DRAM boards, socketing the memory chips also allowed upgrading the boards when larger DRAM chips came out. A number of boards (e.g. the [[National Semiconductor]] [[National Semiconductor  NS23C QBUS memory|NS23C]] and [[National Semiconductor NS23M QBUS memory|NS23M]] memory cards.
+On DRAM boards, socketing the memory chips also allowed upgrading the boards when larger DRAM chips came out. A number of boards (e.g. the [[National Semiconductor]] [[National Semiconductor  NS23C QBUS memory|NS23C]] and [[National Semiconductor NS23M QBUS memory|NS23M]] memory cards).
 Sockets are often found on large chips, even on boards from manufacturers which didn't use them much; whether this is because it limited the chances of damaging them with heat when soldering them in, or because it's harder to remove large chips to replace them if/when they fail, is unclear.