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Old 28th October 2001, 08:05 PM   #1
sonnya is offline sonnya  Denmark
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Philips says "closely matched current gain".
Philips have been smart : no where in the datasheet is there any data on how close they are matched.

Does any but knows where i can find some data on this subject or do any one have some experience on those types.

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Sonny
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Old 16th April 2002, 09:39 AM   #2
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I'm also a bit irritated about the poor datasheet. I have asked Philips about this and they said around 10% and it seems likely. I have used them in my monster overkill phono amp, in the correction amp. The result is quite OK. Approx. 1 mV offset.

Bare in mind though, that they aren't like SSM2220, SSM2221, MAT02, MAT03. The pricetag is up in the sky for those devices.
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Old 16th April 2002, 09:59 AM   #3
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I have a bunch of Siemens (now Infineon) devices. Matching is typically 20% for devices of the same and 30% for PN devices.

The only benefits are smaller case and some thermal coupling, albeit not as fast as if the trannies were on a single die.

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Old 16th April 2002, 02:16 PM   #4
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Was it the same part number, BC847BS/57 from Infineon?
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Old 16th April 2002, 04:59 PM   #5
sonnya is offline sonnya  Denmark
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Thanks for your answer.. I think i will calculate with 20% mismatch.
I do know that the SSM ot MAT types arent cheap at all. That is the reason why i was looking on the types from Philips or Infineon. 1/20 of the price ... I think i can live with some mismatch!! hehe! I am going to try them! Maybe on some daughterboard.

For the Infineon. Try this link Per: http://www.infineon.com/cgi/ecrm.dll....jsp?oid=-8963

By the way Per.. Nice circuitboards you have made .. Are you using Wago connectors.. Looks like it.. Cannot get a better PCB-connector for flexible cable than this. They are used in submarines to.

Sonny
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Old 16th April 2002, 06:08 PM   #6
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Per,

I think the pairs with same polarity are called S and the mixed pairs PN at Infineon.

Greetings,

Eric
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Old 16th April 2002, 06:20 PM   #7
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Talking Hfe ratio

The Toshiba 2SA1349and 2SC3381 are within 10% at 2 mA.

H.H.
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Old 16th April 2002, 08:46 PM   #8
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Default Wago connector is cool!

Quote:
Originally posted by sonnya

By the way Per.. Nice circuitboards you have made .. Are you using Wago connectors.. Looks like it.. Cannot get a better PCB-connector for flexible cable than this. They are used in submarines to.

Sonny [/B]
Yes, Wago is cool.

You know, when Wago had the patent, the competitors did everything to talk bad. Weidmüller even printed a booklet about it! Now when the patent is free, guess who manufactures it besides Wago!

Wago you must like! We (at work) hasn't lost a single Wago customer. If you like Wago you continue to use it. One disadvantage though: Useless if you have more than one wire in one connector!
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Old 16th April 2002, 09:17 PM   #9
sonnya is offline sonnya  Denmark
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Default Re: Wago connector is cool!

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Originally posted by peranders


Yes, Wago is cool.

You know, when Wago had the patent, the competitors did everything to talk bad. Weidmüller even printed a booklet about it! Now when the patent is free, guess who manufactures it besides Wago!

Wago you must like! We (at work) hasn't lost a single Wago customer. If you like Wago you continue to use it. One disadvantage though: Useless if you have more than one wire in one connector!
I was going to say the same .. Only one wire, but the contact never gets loose!!

We have made some equipment with those connectors, perfect !!but you need a lot of space for spare connectors!

Sonny
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Old 19th April 2002, 07:14 AM   #10
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Default Anybody else used these transistors?

Are there more people out there (besides I and Sonny A) who have built something with BC847BS and BC857BS?

As I have said before I have used them in my monster phono amp in the correction stage with excellent result. The only disadvantage is that they are so tiny.

An australian dude have designed a 20 kW amp with those pairs but I haven't seen it working yet. At the moment he is doing something....

http://homepages.picknowl.com.au/glenk/
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