IC pins - what is the metal ?

N

Nigel Cook

Guest
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 .....) diverse2@tcp.co.u.....k
electronic hints and repair briefs
http://homepages.tcp.co.uk/~diverse

Nigel,Diverse Devices,Southampton,England
 
"Nigel Cook" <diverse2@tcp.co.antispam.uk> wrote in message
news:JvGdnXdcdbAQKvbdRVn-sQ@tcp.co.uk...
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 .....) diverse2@tcp.co.u.....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.
Click to expand...
 
"Nigel Cook" <diverse2@tcp.co.antispam.uk> schreef in bericht
news:JvGdnXdcdbAQKvbdRVn-sQ@tcp.co.uk...
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.
Click to expand...
Hmm... think you are. Kynar is an insulator.
FAIK tin plated brass is the most common.

petrus

e-mail (removing .....) diverse2@tcp.co.u.....k
electronic hints and repair briefs
http://homepages.tcp.co.uk/~diverse

Nigel,Diverse Devices,Southampton,England
Click to expand...

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"petrus bitbyter" <p.kralt@reducespamforchello.nl> writes:

"Nigel Cook" <diverse2@tcp.co.antispam.uk> schreef in bericht
news:JvGdnXdcdbAQKvbdRVn-sQ@tcp.co.uk...
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.
Click to expand...
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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"Sam Goldwasser" <sam@saul.cis.upenn.edu> wrote in message
news:6wk70zbzov.fsf@saul.cis.upenn.edu...
"petrus bitbyter" <p.kralt@reducespamforchello.nl> writes:

"Nigel Cook" <diverse2@tcp.co.antispam.uk> schreef in bericht
news:JvGdnXdcdbAQKvbdRVn-sQ@tcp.co.uk...
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.

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/
+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.
Click to expand...
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
 
"Nigel Cook" <diverse2@tcp.co.antispam.uk> schreef in bericht
news:lPqdnWD2aZoSwfHdRVn-jw@tcp.co.uk...
"Sam Goldwasser" <sam@saul.cis.upenn.edu> wrote in message
news:6wk70zbzov.fsf@saul.cis.upenn.edu...
"petrus bitbyter" <p.kralt@reducespamforchello.nl> writes:

"Nigel Cook" <diverse2@tcp.co.antispam.uk> schreef in bericht
news:JvGdnXdcdbAQKvbdRVn-sQ@tcp.co.uk...
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.

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/
+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.



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.
Click to expand...
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 ?
Click to expand...
Don't know.

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



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"petrus bitbyter" <p.kralt@reducespamforchello.nl> writes:

Google for "kynar wire" (kynar insulated wire) to find thousends of hits.
Click to expand...
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/
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Sam Goldwasser <sam@saul.cis.upenn.edu> wrote in
news:6wsmfmi8ik.fsf@saul.cis.upenn.edu:

Kynar is a mechanically tough insulation that used to be used on
wirewrap wire. It has nothing to do with IC pins.
Click to expand...
I believe the word everybody's been searching for is "kovar".

Jerry
 
"Jerry Maple" <jerry.maple@nospam.gddsi.com> wrote in message
news:Xns94BF7A424CB4Cjerrymaplegddsicom@10.240.12.59...
Sam Goldwasser <sam@saul.cis.upenn.edu> wrote in
news:6wsmfmi8ik.fsf@saul.cis.upenn.edu:


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
Click to expand...
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
 
Nigel Cook wrote:
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
Click to expand...
too much time on your hands, mate.


-exm
 
"Nigel Cook" <diverse2@tcp.co.antispam.uk> wrote in message
news:CrGdnUr_98uS-PPdRVn-uw@tcp.co.uk...
"Jerry Maple" <jerry.maple@nospam.gddsi.com> wrote in message
news:Xns94BF7A424CB4Cjerrymaplegddsicom@10.240.12.59...
Sam Goldwasser <sam@saul.cis.upenn.edu> wrote in
news:6wsmfmi8ik.fsf@saul.cis.upenn.edu:


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

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
Click to expand...
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.
 
On Fri, 02 Apr 2004 12:04:04 -0700 Jerry Maple
<jerry.maple@nospam.gddsi.com> wrote:

Sam Goldwasser <sam@saul.cis.upenn.edu> wrote in
news:6wsmfmi8ik.fsf@saul.cis.upenn.edu:


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".
Click to expand...
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.

-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
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