[sdiy] bc847bs and bc857bs - new matched versions

[Benjamin Riggs]

I actually didn't mean either, funny that. The bc847a,b,c are single
trannies, the bc847bs is a transistor pair. I did know 'bout the bcm847bs
being a matched pair, but farnells don't list em here in oz, only the
bc847bs. And they're cheap as chips @ au$0.12 each, so I'm curious to know
if they're useful as a matched pair.

Oh and they're ROHS compliant.

Ben.

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Steve Lenham
Sent: Thursday, 2 June 2005 7:34 PM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] bc847bs and bc857bs - new matched versions

Don't know if they are what Ben meant, but Philips have just released 
"supermatched" versions of the BC847 and 857, called BCM847 and BCM857.

The datasheet claims hFE matching of 10% and VBE matching of 2mV which, for 
those following that thread too, is as good as the specs for the integrated 
NPNs on the Zetex 700 Series semicustom array (and the PNPs are in some 
respects better).

To (not?) answer the usual question, the data doesn't specify whether the 
die is monolithic.

Cheers,

Steve L.


----- Original Message ----- 
From: "Mark Smith" <Mark.Smith at pace.co.uk>
To: <ben.r at iinet.net.au>; <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, June 02, 2005 12:02 PM
Subject: RE: [sdiy] bc847bs and bc857bs


> used them for 15 years. Although not exactly the same, we have used them 
> as like for like replacements for BC547B, BC557B.
>
> They are just good old bog standard small signal trannies. Everything we 
> make at work has 100's of the things in. Somehow they've managed to filter

> into all my synth projects too...
>
> mark
>
> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Benjamin Riggs
> Sent: 02 June 2005 11:36
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] bc847bs and bc857bs
>
>
> Anyone have any experience using these? Any comments? The data sheet 
> doesn't
> say too much except they are closely matched for Hfe.
>
> Ben.
>
>
>
>