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Old 25th March 2008, 12:32 PM   #21
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TAEC, since 1965.
Here's another number
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Old 25th March 2008, 06:05 PM   #22
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it seems almost the 2N3055 chip.
to note the absence of copper pad

Click the image to open in full size.
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Old 25th March 2008, 07:57 PM   #23
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so what did you crack open ?
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Old 25th March 2008, 08:05 PM   #24
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by jacco vermeulen
so what did you crack open ?

Isn't the 2N3055 chip a bit small ? lol
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Old 25th March 2008, 08:10 PM   #25
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Nope, you meant to say : are the others not huge ?
(hint : square rule)
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Old 26th March 2008, 12:47 PM   #26
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I have open an original (I hope ) 2N3773 ON-semi

Observe that :
- the larger silicon chip
- the larger emitter wire
- the copper pad
- without silicon glue

Click the image to open in full size.
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Old 26th March 2008, 01:53 PM   #27
jaycee is offline jaycee  United Kingdom
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Quote:
Originally posted by AndrewT
what!
I have various ages of amplifiers fitted with Toshiba To3 2n3773 transistors going back to the late 70s.
I have a copy of Toshiba's datasheet from the 80s.
Toshiba must have a very short memory or you asked the wrong question.
I think I misread Rod Elliots page - he mentions the 2N2773 transistor having never been made by Toshiba.

However I have noticed that Japanese semiconductor manufacturers never like to admit to their old parts
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Old 26th March 2008, 02:48 PM   #28
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I have some of the Toshiba branded 2N3773, they do not work well in amplifiers designed to use them (Crown DC300A).

The ON Semiconductor 2N3773 has 40% more die area, and the copper heat spreader coin, I suspect that has a lot to do with it.

Hard to think of these parts being equivalent.
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Old 26th March 2008, 04:04 PM   #29
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Genuine 2N3773s are workhorses, I like them.
~250W 100mS SOA at Tc=70°C. One pair of them in quasi-complementary configuration does 100W-RMS safely.
Attention, for audio amplifiers only the epitaxial type's are OK (Ft=4MHz)! The homotexial (Ft=0.5...1Mhz) 2N3773s are only sufficient as series pass transistors in linear PSUs.
Somewhere I've got an old Mot (?) datasheet that shows Ft curves too. Anyone interested? Then I'll dig up my winchester.
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Old 26th March 2008, 04:17 PM   #30
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How does one tell the difference between homo & epi?

1.5A continuous @ 100Vce is almost unique among 150W devices. And even better ONsemi supply 100% tested for this parameter.

A real workhorse.

ps,
ONsemi show near 400W upto 80Vce for 100mS SOA
Which probably explains why my Crimson1704 1pair Quasi complementary claim 170W into 4r0 and I have tested it to 200W into 4r0 in the short term (~2seconds)
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