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IC pins - what is the metal ?

N

Nigel Cook

Jan 1, 1970
0
What are IC / Transistor pins etc made of ?.
The name for the material and its alloyed? constituents
I thought it was something called kynar but that may be wrong.

e-mail (removing .....) [email protected].....k
electronic hints and repair briefs
http://homepages.tcp.co.uk/~diverse

Nigel,Diverse Devices,Southampton,England
 
J

jtech

Jan 1, 1970
0
Nigel Cook said:
What are IC / Transistor pins etc made of ?.
The name for the material and its alloyed? constituents
I thought it was something called kynar but that may be wrong.

e-mail (removing .....) [email protected].....k
electronic hints and repair briefs
http://homepages.tcp.co.uk/~diverse

Nigel,Diverse Devices,Southampton,England
Tinned brass usually, some may be gold plated brass.
 
P

petrus bitbyter

Jan 1, 1970
0
Nigel Cook said:
What are IC / Transistor pins etc made of ?.
The name for the material and its alloyed? constituents
I thought it was something called kynar but that may be wrong.

Hmm... think you are. Kynar is an insulator.
FAIK tin plated brass is the most common.

petrus
 
S

Sam Goldwasser

Jan 1, 1970
0
petrus bitbyter said:
Hmm... think you are. Kynar is an insulator.
FAIK tin plated brass is the most common.

This is April 1. :)

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
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N

Nigel Cook

Jan 1, 1970
0
Sam Goldwasser said:
This is April 1. :)

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

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Explains why i could not find the constituent metals in kynar by keyword
search - must be some other trade name or something I mis-remembered as
kynar.
Some formulations seem to be hard and some soft or is it just work-hardening
of brass in the formation of the pins ?

For hoaxes how about this for someoe's effort
http://www.netcentral.co.uk/satcure/audio/scam.htm
 
P

petrus bitbyter

Jan 1, 1970
0
Nigel Cook said:
Explains why i could not find the constituent metals in kynar by keyword
search - must be some other trade name or something I mis-remembered as
kynar.

Google for "kynar wire" (kynar insulated wire) to find thousends of hits.
Some formulations seem to be hard and some soft or is it just work-hardening
of brass in the formation of the pins ?

Don't know.
For hoaxes how about this for someoe's effort
http://www.netcentral.co.uk/satcure/audio/scam.htm

petrus
 
S

Sam Goldwasser

Jan 1, 1970
0
petrus bitbyter said:
Google for "kynar wire" (kynar insulated wire) to find thousends of hits.

Kynar is a mechanically tough insulation that used to be used on wirewrap
wire. It has nothing to do with IC pins.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the feedback form on the S.E.R FAQ Web sites.
 
J

Jerry Maple

Jan 1, 1970
0
Kynar is a mechanically tough insulation that used to be used on
wirewrap wire. It has nothing to do with IC pins.

I believe the word everybody's been searching for is "kovar".

Jerry
 
N

Nigel Cook

Jan 1, 1970
0
Jerry Maple said:
I believe the word everybody's been searching for is "kovar".

Jerry

Yep, must be my failing memory.
Just searched for Kovar and one firmulation for that
used in leads is an alloy of Iron,Nickel and Cobalt
no zinc which was what i was expecting
 
E

exray

Jan 1, 1970
0
Nigel said:
Yep, must be my failing memory.
Just searched for Kovar and one firmulation for that
used in leads is an alloy of Iron,Nickel and Cobalt
no zinc which was what i was expecting

too much time on your hands, mate.


-exm
 
N

Nigel Cook

Jan 1, 1970
0
Nigel Cook said:
Yep, must be my failing memory.
Just searched for Kovar and one firmulation for that
used in leads is an alloy of Iron,Nickel and Cobalt
no zinc which was what i was expecting

The presence of iron explains why I have occassionly come across rusted IC
pins when the ICs have been stored in certain types of conductive foam
that seem to have taken moisture out of the air.
 
J

Jim Adney

Jan 1, 1970
0
I believe the word everybody's been searching for is "kovar".

It's possible, but I doubt it. Kovar is used for wires to be sealed in
glass, and similar applications. I believe it has a low coefficient of
expansion (or just happens to match that of glass.) I've used it as a
match to alumina ceramic.

Yes, Kovar will rust. It is also magnetic, which makes this an easy
hypothesis to test. I'll try this here in a minute.

It's just possible that Kovar was used for the lead frame in the early
days when IC bodies were ceramic.

-
 
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