BD139-16 & BD140-16? Anyone use these transistors? - diyAudio
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Old 25th February 2007, 05:11 PM   #1
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Default BD139-16 & BD140-16? Anyone use these transistors?

Are they new, modern, fast? How's the c-b capacitance? Need 60c-e breakdown, >625mw. Thanks Ray
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Old 25th February 2007, 05:55 PM   #2
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You too can type "BD139 datasheet" into Google and get a .pdf dayasheet in seconds.
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Old 25th February 2007, 06:38 PM   #3
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Default Yes, I have the datasheet. ........

I'm looking for real world experience! Datasheet says nothing about the c-b capacitance. Need to talk to a real person who has used them. Thanks Ray
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Old 25th February 2007, 06:54 PM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
these are an old design and as usual the manufacturer at that time gave very few details.

What were they afraid of divulging? How large a spread in parameters existed at that time?

Surprisingly, modern versions with newly published data sheets do not show any extra information.
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Old 25th February 2007, 07:03 PM   #5
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Default Re: BD139-16 & BD140-16? Anyone use these transistors?

Quote:
Originally posted by grhughes
Are they new, modern, fast? How's the c-b capacitance? Need 60c-e breakdown, >625mw. Thanks Ray
Very good transistors.
Along with TO-220, MJE15030 / MJE15031
these TO-126 are the most used as Drivers for Audio Output stages.

They are also often used as thermal sensors, placed on the heatsink.
To avoid thermal 'runaway' and overheating.

They do excellent compared to most alternative transistors
in my Audio Amplifiers simulations!

They are old, yes. There are newer surface mounted versions of these.
Even though old, they compete very well.
Maybe because there just isn't too many good audio driver complementary NPN/PNP around.


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Old 25th February 2007, 08:23 PM   #6
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Default Re: BD139-16 & BD140-16? Anyone use these transistors?

Quote:
Originally posted by grhughes
Are they new, modern, fast? How's the c-b capacitance? Need 60c-e breakdown, >625mw. Thanks Ray
You need to be aware that there are genuine Philips BD139 and BD140 - both are excellent devices (essentially these are BC639 and BC640 in TO126 package) and there are many other devices carrying these numbers - namely from ST, Samsung and many others, all of which are not very good at all from my experience. None of these "clone" manufacturers would give Ft parameter in their datasheet (Philips ones are rated at 160 MHz) and the device capacitances are about twice of the values for Philips (now NXT http://www.nxp.com )

Here is the link for Philips datasheets:

http://www.nxp.com/acrobat_download/..._138_140_3.pdf

http://www.nxp.com/acrobat_download/..._137_139_3.pdf

Unfortunately, these good transistors are no longer in production. So, if you are sure that you'll get proper Philips BD139/140 transistors - use them, otherwise I wouldn't touch these "clones" - they are not really good for anything, IMHO - even in a voltage regulator.

Cheers

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Old 26th February 2007, 08:12 AM   #7
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I use them all the time for;

- middle stages and V(be) multipliers in audio power amplifiers.
- output stages in small amps (headphone amps)
- audio and high frequency line drivers
- switches

Lots of places.

Cheers
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Old 26th February 2007, 08:46 AM   #8
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Back in the old days you had to open a semiconductor book to look at a datasheet, instead of clicking a pdf.
Of course, the semiconductor data book comes free if you've got a relative employed at the Philips NatLab in Eindhoven.
Free online datasheets often are abbreviated versions, sometimes saves you 10 to 14 pages.

A bunch of BD139/140s in parallel make a fantastic class A headphone amp output stage.
Philips versions are much nicer, Cob of 5.7pF, downside that the power they handle is 2/3d of the different die version.
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Old 26th February 2007, 09:01 AM   #9
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Default Re: Yes, I have the datasheet. ........

Quote:
Originally posted by grhughes
I'm looking for real world experience! Datasheet says nothing about the c-b capacitance. Need to talk to a real person who has used them. Thanks Ray
What are going to use those for?
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Old 26th February 2007, 09:04 AM   #10
x-pro is offline x-pro  United Kingdom
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Quote:
Originally posted by jacco vermeulen
Philips versions are much nicer, Cob of 5.7pF, downside that the power they handle is 2/3d of the different die version.
"Different die version" is a completely different transistor altogether which by accident shares the name with the original Philips device. Most annoying is the fact that these are much slower devices that Philips and would perform considerably poorer in audio. It is indeed 12W device (Philips is 8W) and no Ft rating at all.

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