Hello Technet,

Anybody who has an opinion about if it is necessary to have different
rules=
 for derating a design with PED:s  (Plastic Encapsulated Devices) than
cera=
mic components?

Sometimes a situation comes up to use PED:s more or less outside the
specif=
ied temperature limits.
Is there anybody, who has any experience of this and maybe also an idea
of =
sufficient derating when using PEDs outside limits? The use outside
tempera=
ture limits provides of course the necessary tests. Derating can be
perform=
ed in different ways, dep. on device types, e.g. reduced voltage,
fun-out e=
tc.

Sven-Eric B=E4ckstr=F6m




Sven-Eric-

Though it may not address ceramic vs. PED directly, you may be
interested in a recent IEEE Trans. CPMT article, prefaced by Michael
Pecht of CALCE Univ. of Maryland, "Uprating Electronic Components for
Use Outside their Temperature Specification Limits", by Mark Wright,
David Humphrey, and F. Patrick McCluskey, IEEE CPMT Part A, Vol.20,
No.2, June 1997, p. 251-256.

Michael Alderete
[log in to unmask]
Aerojet

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