[sdiy] PNP and NPN matched pairs / arrays?

[Tom Wiltshire]

On 4 Jan 2012, at 20:02, Dave Kendall wrote:

> 
> On Jan 4, 2012, at 19:25, Justin Owen wrote:
> 
>> Hello,
>> 
>> I'm about to start looking into the world of matched transistor pairs or arrays of 4.
>> I'm working on a design that might benefit from matched versions of 2x NPN and 2x PNP pairs (4x NPN and 4x PNP total).
>> Ideally I'd like something that was available in DIL and SOT-23 (or similar) - but if I had to choose one over the other - SMT parts are my preference.
>> Does anyone have a favourite part or range they could suggest for me to have a look at?
>> FYI - I'm currently using 2N3904s and 2N3906s matched with my DMM - so I'm up for hearing about any parts that might be an improvement on that (excluding hand-matching pairs).
>> Thanks - and happy new year to everyone!
>> 
>> Justin
>> 
> 
> I haven't used them myself, but I believe they have been used in sdiy successfully before (can't remember where though - an Oakley module maybe?)
> 
> Check out the THAT340 for a dual NPN + PNP pair in a DIL or SMT package.
> http://www.alldatasheet.com/datasheet-pdf/pdf/122003/ETC1/THAT300.html
> 
> Hope this helps :-)
> Happy new year!
> 
> cheers,
> Dave

The THAT Corp ones are supposed to be very good, but there's no comparison on price. £6/unit for the THAT Corp NPN+PNP pair in SOIC format, versus £0.32/unit for the separate NPN/PNP pair in SOT26 that Crow mentioned. I know which ones I'd try first...

T.