matched transistors: gotta love those prices

Try finding dual darlingtons.

Manufacturer: PRX Other Products Sales Price $140.00 Mfg. Part # KD324510 Condition NS Unit In Stock 4 In Stock And Ready To Ship!

Product Overview Dual Darlington Transistor Module (100 Amperes/600 Volts)

For that price you'd want it manufactured by nude virgins and then individually tweaked and sorted by a wise old pipe smoking gray bearded analog guru with his tounge stuck out at the right angle.

Dave.

Now THAT is funny! I smoked a pipe for 36 years, from age 18 to age

1. (Then a heart attack at age 58... should never have quit smoking :-)

...Jim Thompson

CA3127, only $2.63 (but DigiKey is out of stock on that one). How does anyone learn electronics, if the matched transistors for a lab experiment cannot be obtained without NRE charges for a semicustom?

Dunno of they're matched -- Digikey used to sell Zetex matched pairs as "current mirrors"; they still might.

You can get parts like the MAT01 for $11

If you act fast, you can get some DMMT5551-7 parts for small change.

This looks promising:

Not a dual darlington and pretty crappy transistors, at that. =20

SPICE.

CT-

We were using ZDT605s but they went obsolete and I couldn't find=20 any replacement. For the old product, we were able to find enough=20 for an end-of-life buy (I hope purchasing listened). For a new=20 application I didn't need the current thus gain, so ditched the=20 darlington configuration and used a DMMT3904 (two 3904s in a=20 SOT-363). Not a perfect solution but good enough.

=20

Zetex was bought out by Diodes Inc. and has dropped a pile of=20 parts.

AD sells matched pairs too, but they're quite expensive ($6-$10,=20 IIRC).

^^^ ^^^

Only a couple (five and 1-1/2) of orders of magnitude off my requirements. ;-)

^^^^^^^ Three here, too. ;-)

Diodes Inc only has 6 items for matched pairs now .

Vceo max is 160V FOR DMMT5551.

Digikey has all of them in stock.For soime reason the search at Digikey list some of them under singles not dual, but they do have all of them. 56 cents cut tape.