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Old 14th June 2009, 12:48 AM   #1
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Default BD139/140 driver

Hello to All

I'm designing an amplifier and would use the BD139/140 as drivers (good in simulation "Fairchild").
Told me that the good BDs are only the old Philips.
Datasheet BD139 Philips-1999 and BD139 ST-recent:
http://www.datasheetcatalog.net/pt/d...BD139-16.shtml

I saw very recent projects to BD139/140-16, which is the FT(190Mhz???), these newer BDs?
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Old 26th November 2010, 10:17 AM   #2
abetir is offline abetir  Philippines
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same here fella, i'm about to construct a mosfet amp using IRF9540/IRF540 as the output pair but i'm not optimistic in finding these BD139/140 for drivers
in my area.
Has anyone of you knows of a better subs?
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Old 26th November 2010, 11:42 AM   #3
Mooly is online now Mooly  United Kingdom
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MJE340/350 are ancient old favourites.
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Old 26th November 2010, 11:55 AM   #4
sajti is offline sajti  Hungary
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Old 26th November 2010, 05:05 PM   #5
godfrey is online now godfrey  South Africa
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Here's a nice list:
Driver Transistors
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Old 26th November 2010, 10:03 PM   #6
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"Resurrected" the topic

About the BD 130/140 did not get more information, I opted for the MJE15028/29 that has a good symmetry PNP/NPN guaranteed by the manufacturer.
Quote:
MJE340/350 are ancient old favourites.
I prefer MJE 243/253 in place these and cost about the same price.
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Old 26th November 2010, 11:23 PM   #7
wahab is offline wahab  Algeria
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BD139/140 from fairchild, onsemi or stmicro should work quite well.
Just look for 10 or 16 versions, otherwise, they can have fairly low
current gain if the batch is mediocre..
Models from nxp/phillips are preferable, though...

Edit: in my spice library, the fairchild are faster than the phillips.
The onsemi are the worse.
Worth adding that generaly, fairchild has correct spice models.

Last edited by wahab; 26th November 2010 at 11:35 PM.
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Old 27th November 2010, 08:54 AM   #8
jitter is offline jitter  Netherlands
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Quote:
Originally Posted by Rafael L View Post
Hello to All

I'm designing an amplifier and would use the BD139/140 as drivers (good in simulation "Fairchild").
Told me that the good BDs are only the old Philips.
Datasheet BD139 Philips-1999 and BD139 ST-recent:
BD139-16 Datasheet pdf - Transistor de poder de NPN - Philips

I saw very recent projects to BD139/140-16, which is the FT(190Mhz???), these newer BDs?
The company I work for assembles an instrument used for electrochemical impedance spectroscopy. It's basically a simple device but one that demands high quality components be used to meet incredibly stringent linearity and noise specs. E.g. 5-10% of the AD797 exhibit the "popcorn effect" and need to be replaced for the device to be within noise specs.

One of the components in it has some BD139/140, we are specifically NOT allowed to use Philips. ON is specified instead, and these have never given any problems. You might consider these yourself.
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Old 27th November 2010, 12:15 PM   #9
Bonsai is online now Bonsai  Taiwan
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For Driver applictions in audio amplifiers Cob and popcorn noise are not paramters I would concern myself with. For a VAS transistor, it is of course a completely different story -there Cob is critical, although I would assume popcorn noise less so (popcorn noise on a device designed to conduct 10's of mA sounds a bit strange to my ears I have to admit).

Therefore, provided your design does not exceed the Vce breakdown spec, I don't see a problem with the BD139/140 from any supplier.
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Old 27th November 2010, 02:23 PM   #10
jitter is offline jitter  Netherlands
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I mentioned the popcorn effect mostly as an illustration of the tight specs this device is subject to. We're talking 4 nA pp noise into a 1k load, not something you'd worry about in an audio device. The name was derived from the fact that it sounds like corn popping when played through speakers, though...

I don't know the reason for the exclusion of the Philips BD139/140 in this product, but I mentioned it because OP implies that these would be the only good ones.
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