BD139-16 & BD140-16? Anyone use these transistors? - Page 3 - diyAudio
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Old 27th February 2007, 01:47 PM   #21
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Default Are Toshiba 2SC3421 & 2SA1358 better ???

Or are these obsolete? Thanks Ray
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Old 27th February 2007, 01:55 PM   #22
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Better if you need a higher voltage rating, but they easily cost 4 times as much.
For the cost and for rails lower than 35Vdc you'll have to do better in finding a superior device, much better.
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Old 27th February 2007, 05:32 PM   #23
jcx is offline jcx  United States
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It is really unlikely that most transistors are really identical to their nominal 10-20-30+ year old base part

the growth/diffusion equipment, wafer sizes, lithography, materials purity all have changed several generations since the original parts were made

ON Semi anounced an broad "die shrink" change in 2003 for many of these driver transistor types:

http://www.diyaudio.com/forums/showt...282#post483282
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Old 27th February 2007, 05:45 PM   #24
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Default I did some experimentation with oscillators

And back in 1976 or so, I would have to sort through 100s of 2n2219As and 2N2905A to find two that were matched. The JANTX2n2219A and -05A was the best because they were presorted. How can you buy presorted transistors now???? But this particular die was very fast and the oscillators would produce less waveform distortion with this transistor than most others because of C-B capacitance that controls switching times and I guess because of die geometry. I've just been out of it and want to upgrade my system. Just trying to find up to date, fast transistors. Thanks again. Ray
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Old 1st March 2007, 08:06 PM   #25
sbrook is offline sbrook  Canada
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Defintely OLD ... They're lower voltage VCE cousins the BD137/138 are listed in my Mullard pocket data book dated 1970.

Mullard was the British components division of Philips after being bought out in the 1920s. Philips continued to use the Mullard name until 1988 in the UK. In 2006, Philips spun off and sold the majority of its business sharesin Philips semicondictors to NXP. So you may see all 3 names associated with the same semiconductor products.
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Old 1st March 2007, 08:57 PM   #26
lineup is offline lineup  Sweden
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Default Re: Thanks for all the suggestions!

Quote:
Originally posted by grhughes
Any special advice for heat sinking SOT89 transistors. The first transistor of a sziklai pair doesn't have to be heat sinked? I've never used SMT devices. I guess they have to lay flat?? Thanks, Ray

BC639 / BC640 are TO-92 versions of
BD139 / BD140
But of course TO-92 can not take as MUCH Heat/ temperature
as can one TO-126.


If you want modern SMT versions of BC639/BC640
for 80 Volt Collector Emitter,
check out these data sheets at Philips Website http://www.nxp.com/

BCP-53 and BCP-56
BCX-53 and BCX-56

You will also find Spice + Saber Models for those:
http://www.nxp.com/models/


If you make maximal good mounting for cooling,
these small SMT transistors can take close to 1 Watt.


PRODUCT PAGES:

http://www.nxp.com/pip/BC639.html
BC639; BCP56; BCX56
80 V, 1 A NPN medium power transistor series


http://www.nxp.com/pip/BC640.html
BC640; BCP53; BCX53
80 V, 1 A PNP medium power transistors




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since 1985 ( 22 years! )

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Old 2nd March 2007, 07:21 AM   #27
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Here's a pic: the one on the left is a Philips type, the second one a Thomson device.
Technology may have evolved in 20 years time, but 20 years ago the Philips BDs were very different from the others, as are the last production runs.
The Philips lab was amazing, i had one of the first pre-production CD100s in 1982/1983, (compliment of Philly Med. Systems), marketing never was their strongpoint.
Mullard tubes lives again, btw.

LineUp.
the ones on the pic i bought before 1985, guess i'm an ever bigger relic than you.
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Old 2nd March 2007, 12:17 PM   #28
sbrook is offline sbrook  Canada
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Indeed they do, Mullard valves (my Brit heritage ) are manufactured by New Sensor Corp. who make Sovtek, Tungsol etc. They have acquired the rights from Philips to use the name and the construction design of Mullard valves.
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Old 7th May 2007, 06:28 PM   #29
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Finally managed to get a clear digital cam shot of last production Philips BD140 devices, tricky casing color, so here goes=>
Attached Images
File Type: jpg phi-bd140.jpg (51.0 KB, 950 views)
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Old 16th June 2007, 11:44 AM   #30
lineup is offline lineup  Sweden
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Quote:
Originally posted by jacco vermeulen
Finally managed to get a clear digital cam shot of last production Philips BD140 devices, tricky casing color, so here goes=>
thanks for you images, jacco

I have only a few of my BD139/140 supply.
Think they are all Philips.
At least when I bought them,
the big electronics supplier in North Europe http://www.elfa.se/
website in: Svenska Norsk Dansk Suomi Polski English
had a lot of (old) Philips semiconductors.

Now looks as they sell OSE OnSemi former Motorola versions ...
Are they okay?
Quote:
Buy!
BD135/OSE 71-041-02 Info Datasheet 1.10 0.82 0.41 NPN E C B 12.5 45 1.5 40/250
BD136/OSE 71-036-58 Info Datasheet 0.97 0.45 0.32 PNP E C B 12.5 45 1.5 40/250
BD137/OSE 71-036-66 Info Datasheet 0.95 0.44 0.31 NPN E C B 12.5 60 1.5 40/250
BD138/OSE 71-036-74 Info Datasheet 0.96 0.45 0.32 PNP E C B 12.5 60 1.5 40/250
BD139/OSE 71-036-82 Info Datasheet 0.76 0.35 0.24 NPN E C B 12.5 80 1.5 40/250
BD140/OSE 71-042-35 Info Datasheet 1.03 0.76 0.38 PNP E C B 12.5 80 1.5 40/250

Below is result from my electronical corner of my room ( I live alone in 1 room + kitchen + bathroom)
Photo Session 15 minutes ago:
Lineup Audio Lab
Exhibition of BD139 BD140 stuff


Image #1:
Overview of a part of my working place, with those TO-126
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File Type: jpg 687__1a_80.jpg (92.7 KB, 820 views)
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