Electronics Forum: pure tin (Page 1 of 9)

Pcb immersion tin thickness

Electronics Forum | Wed Aug 09 08:06:07 EDT 2006 | davef

See "IPC-4554 Specification for Immersion Tin Plating for Printed Circuit Boards" 3.2.1 Immersion Tin Thickness. The most common reason for solderability issues with the white tin surface coating during multiple thermal excursions is a thin white ti

High tin content @ Wavesolder

Electronics Forum | Tue Feb 27 13:21:24 EST 2001 | kmorris

We've recently identified that one of our wavesolder machines has a high tin content. It should be 63% and is greater than 1% above that. We are adding pure tin to adjust the ratio back to 63%. I'm wondering what defects might be expected as the ti

Lead free tin copper only

Electronics Forum | Wed Feb 08 04:08:35 EST 2006 | fctassembly

Hello Greg, I agree with you that the article in SMT Magazine should be studied very carefully as it contains many errors in respect to SN100C. The testing performed was a DOE and was not an optimized run. There is also a statement on dross generatio

Immersion white tin wave soldering problem

Electronics Forum | Fri Dec 16 08:16:41 EST 2005 | davef

Heat cycles deplete the pure tin layer. Each solder cycle reduces the tin thickness by ~0.1 micron (4 uin). So, if you start with a thin imm tin coating you'll have problems after multiple heat cycles. Steve Wentz says, "In almost every case I've

Immersion white tin wave soldering problem

Electronics Forum | Fri Dec 16 08:00:26 EST 2005 | jax

What you are most likely dealing with: Insufficient Pure Sn layer ( multiple causes ) Because elevated temperatures accelerate the diffusion process, the thickness of the Pure Sn layer will reduce during every thermal cycle... ( bakeing PCBs, S

Pure Tin Quandry

Electronics Forum | Sat Jun 04 01:39:39 EDT 2005 | adlsmt

It would appear that pure tin is backward compatible with leaded processes. This makes it a great finish, as if you migrate all your parts over time there is no issue mixing them. I am not aware of any finish that eliminates the possibility of tin wh

Rollback the Lead-Free Initiative by Dr. Howard Johnson

Electronics Forum | Mon Jul 14 11:35:09 EDT 2008 | stepheniii

NASA won't allow a pure tin finish in space. Any part with a pure tin finish must be recoated.

How to prevent defective material from getting to stock?

Electronics Forum | Thu Aug 14 14:01:03 EDT 2003 | Andrea

I was recently given a copy of the "Tin Whisker Agency Action Notice" I was then asked to recommend and implement a action to prevent the suseptible components from reaching our stockroom. Since I can not commit my personel to activly research which

Pure Tin Quandry

Electronics Forum | Fri Jun 03 16:40:48 EDT 2005 | Andrea

I have a customer who has put a restriction against pure tin finish components. We have gotten our BOMs compliant with all but 5 parts. Fairchild p/n FDD6512A, FQD12N20C, IRLM120A Bournes 3214G-1-501E Sprague 10TS-D10 I am looking for a standard pr

Solder briding on QFP

Electronics Forum | Mon Mar 01 15:28:30 EST 2010 | mikesewell

Pure tin finish? Tin whiskers?

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