Matched dual SMD transistors for input and current mirror

[speedy6963]

Toshiba HN4A06 as diff pair
Toshiba HN4C51 as the current mirror

anyone see problems with using these ? will be feeding from current source LND150

Microsoft OneDrive - Access files anywhere. Create docs with free Office Online.

 

[ohdsp]

Look like good parts....

Always best to build and test if you are not sure, stick them down on some veroboard or similar.

 

[Mark Tillotson]

Yes good specs - what voltage / current are you thinking of - the low power dissipation might become an issue in some circumstances, but otherwise they look capable.

 

[speedy6963]

Yes good specs - what voltage / current are you thinking of - the low power dissipation might become an issue in some circumstances, but otherwise they look capable.

The LND150 is proving about 2ma to the pair, about 1ma per trans.

I have it running and seems to work well and wondered why I have never seen them used in any designs.

the pairs are extremely well matched and using no degeneration in the circuit and performs beyond expectations

 

[Bonsai]

NXP also do these see for example the BCM856 and it’s complement.

For DIY they are small parts with a tight lead pitch. I have a discrete line stage using them in a current mirror - but some folks will struggle I think.

 

[Bigun]

I did this in 2011 using a home etched pcb. Never again, it was too hard. But with a commercially produced pcb like those I use nowadays it should be fine.

TGM5 - all-BJT Simple Symmetric Amplifier

 

[DaveG]

I don't see on the datasheets about matching of the Toshiba's. Are they?