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JosephKK

Phil Allison posted to
alt.binaries.schematics.electronic:

"Joseph Krazy Klutz"
" Phil Allison "

All the Darlington power BJTs I have ever seen use ONE chip.

The driver is tucked away in a corner.

** As in this example, (see jpegs) from the early 1980s.

A TIC brand " MJ15004 " coded " 8024" for the 24th week of
1980.

Unless i misjudge the photos pretty badly that is no where near a
typical 100 W device, let alone a 300 W device.

** Joe - real MJ15004s are NOT Darlingtons !!!!

Not the issue

They do not have 1.4 volts drop from B to E terminals.

None that i have used exhibited darlington behavior.

They do not have a reverse diode from C to E .

What does that have do with the example shown?

They do not read 4.3 kohms from B to E in both directions.

That would indicate a dead transistor, not the issue of the
photograph.

Capice ????

So far, it seems that i comprehend better than you. Two dice is not
one die. Exactly one lifted lead and one visible attachment point
needs no explanation.

....... Phil