BD139-16 & BD140-16? Anyone use these transistors? - Page 2 - diyAudio
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Old 26th February 2007, 09:08 AM   #11
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A bit awkward, isn't it.
Even the Siemens versions +20 years ago were totally different.
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Old 26th February 2007, 09:20 AM   #12
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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
I would recommend these devices:

http://www.nxp.com/acrobat_download/...53_BCX53_6.pdf

http://www.nxp.com/acrobat_download/...56_BCX56_7.pdf

unless you will get original Philips BD139/BD140 - the same die in TO126 case.

Cheers

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Old 26th February 2007, 09:32 AM   #13
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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

I've used them for the last 25 years, on and off.
That help?

Jan Didden
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Old 26th February 2007, 09:33 AM   #14
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Excellent choice. I have used BCP53/56 in this amp.
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Old 26th February 2007, 09:55 AM   #15
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How do you distinguish the Philips version?
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Old 26th February 2007, 11:30 AM   #16
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Devices from other manufacturers usually carry a logo.
For instance: ST(Samsung) or SGS (Thomson), since 1987 one and the same company.
Most have the printing vertically on the device, an exception is an On/Motorola which looks very similar to the Philips device.
Philips devices have horizontal labels, either no logo or something like phi scribbled unreadable in front of the hFe ranking. See example picture, i'll post you a better/sharper one later on=>

ps:
i haven't spent a second keeping track on such devices in 20 years time as i've only used the Philly parts since, please correct me if i flunked the exam. The lines above are taken from the brainwash bank.
Amusing crumb: it was a German audio designer who pointed me to not using any other than the Phi devices.
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File Type: jpg philips bd140.jpg (4.9 KB, 1195 views)
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Old 26th February 2007, 01:22 PM   #17
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Quote:
Originally posted by stoolpigeon
How do you distinguish the Philips version?
On top of what already was written by jacco, I would add that it is possible to check the capacitances of the device if you have a capacitance meter. If my memory serves me right, Philips BD140 would have B-C capacitance about 50-60pF at 0V, and ST etc. - about 100-120 pF. In any case the capacitances on BC640 and Philips BD140 (and their NPN complements BC639/BD139) are near identical.

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Old 26th February 2007, 01:44 PM   #18
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Quote:
Originally posted by x-pro
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) a

But the 8W rating of the Philips is at a Tmb of 70º C and they are usualy usually given at 25º C...
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Old 26th February 2007, 02:10 PM   #19
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Quote:
Originally posted by Tube_Dude
But the 8W rating of the Philips is at a Tmb of 70º C and they are usualy usually given at 25º C...
It is given by Philips at less or equal 70C ambient. However it is the absolute maximum dissipation for this device and as such it would be the same for 25C.

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Old 26th February 2007, 02:32 PM   #20
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Default Thanks for all the suggestions!

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
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