Marie,
First, look at capacitors: do you have wet electrolytes? They are the worse.
The second best are the tantalum capacitors. What are the voltage and the
current capacity of the board? Solders can be broken, and current transient
may cause high voltage spikes over the supply lines. 

Ofer Cohen
Quality Assurance Manager
Seabridge Ltd.


-----Original Message-----
From: ME Magnin [mailto:[log in to unmask]]
Sent: Monday, February 10, 2003 18:14
To: [log in to unmask]
Subject: [TN] Dammage on components at low temperatures


Dear Technetters,
we have build PCB's with a commercial range processor (and a few other
components), and tried to have it work at -40°C.
of course, it failed, this could be predictable.
our concern is that the board failed too when tested during raising
temperature to +40°C (via a low temperature gradiant), because of several
dammaged components.
our R&D engineer is investigating to determine the cause of the failure, but
it brought me to the following question : is there any risk to destroy a
component when using it at a temperature lower than the lower limit ?
if yes, which process does dammage the component ?

thanks for sharing your experience

kind regards

Marie Magnin
QA Manager

FIRSTEC SA
Rue du Grand Pré 70
CH 1211 Genève 2

Tél.   : +41(0)22 918 36 85
Fax   : +41(0)22 918 36 93
mailto:[log in to unmask]
http://www.firstec.ch

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