[time-nuts] GC-1000 Clock Cap Choice

Bob Camp lists at rtty.us
Sun Jan 16 19:40:04 EST 2011


Hi

Be *very* careful of some of the manufacturers on that list. They do not all agree on what a X5R is and does. None of them take it to Z5U territory, but they don't all do the same thing for the temp co or the voltage dependance. Check the data sheet ....

Bob


On Jan 16, 2011, at 7:02 PM, Dr. Frank Stellmach wrote:

> Sorry, epcos sold ceramics business, and was itself swallowed by TDK.
> 
> If looking for X5R and X7R cer caps, visit vishay, kemet, taiyo yuden, murata and others instead.
> This special material specification is well hidden at the official manufacturers specs.
> 
> Those are high grade ceramic dielectrics, realtively cheap, not necessarily space qualified, only automotive, and especially not an exotic component anymore.
> 
> If Tek had problems with tantalums in the past, they either have chosen bad suppliers (reliable / safe production is critical), or that was at the time, where the failure mechanisms were not understood well, or they have ignored application hints.
> 
> Today, its possible to use Tantalums safely even in automotive applications, that goes for ceramics also.
> 
> Its - as always - a question of component knowledge and reliability engineering.
> 
> Frank
> 
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