Way down the 2SK3018 thread,
On 8/6/19 5:24 AM, Winfield Hill wrote:> Robert Baer wrote... >> WARNING. Be advised that every manufacturer of a given part (the >> 2SK3018 in this case) runs their fab differently, and you may find that >> those particular specs may be WIDELY different - enough to make the part >> virtually useless. > > Or not. Of course, one must fully evaluate a > second-source manufacturer's parts, before > committing it to manufacturing.
Too right--and worth a separate thread of its own, I think.
My favourite horrible example is the TLV431. The Diodes Inc version is super well behaved and stable, as shown in the stability plot on P.7 of .
Ooooonnn the other hand, see ON Semi's (in)stability plot at Figure 18 of
and TI's not-quite-as-bad-but-still-pretty-awful TI version, Figure 18 of .
The Diodes part is stable for all load capacitances and all output voltages, provided the anode current is over a milliamp or so.
The other two have horribly complicated behaviour, with the ON Semi part taking the biscuit with four separate regions of instability.
What are your horror stories?
Cheers
Phil Hobbs