Witch FET to buy?
I have used BF245, A and B, but DigiKey do not have those. I need a cheap, general purpose FET, A and B. TO92 are OK. DigiKey are, for us, an ok source.
Captcha'd for this! ???
Here are a datasheet of BF245:
I am not "familiar" with FETs. I guess 15V and 15 mA will do for me. I will try it as a preamp. for a heart beat sensor.
I wasn't sure if you were using it for small signal switching, or looking for a higher current rated device.
For many applications I've used the 2N7000 (TO-92 through hole package), 2N7002 (SOT23-3L Surface mount package).
Vdss = 60 V
Id = 350 mA
Rdson < 5 ohms, (Typically 2 ohms)
It is readily available from lots of suppliers.
I second the 2n7000/2n7002 recommendation. I bought some of the 7002's from tayda where they're 4c ea.
I have no special talents. I am only passionately curious. - Albert Einstein
2N7000 is not a re[lacement, it is a totaly different kind of device.
Try sourcing 2N5484, 2N5485 or 2N5486 as a last choice based on gate pinch off voltage specification.
Just checked Digikey. the part no longer stocked . Same at Element14.
Digikey do have
Yes it is grim.
Element14 do have SMD equivalents if that is any help.
google "BF245 replacement" give this :
But if you don't need the speed go for one of the others
A bf245 is a jfet. Fine if you want to switch audio. If you want to switch a relay or led, then you want a mosfet like the 2N7000/2 suggested.
My local supplier (www.reichelt.de) has BF245B and BF245C in stock. I could order some and send them to you.
If you need only 2, I have enough to send you 2,
give me a PM.
BFR31 or BF 5484 or 2SK192 might do the job also.
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