Whatever, DN2540 is the most popular, is Gfs 325 mmho for instance. Just because so easy to cascode with minimum parts, its very tempting to design like that in an HV CCS. But I say that the IRFBC with the help of a cascode tailed scheme governing its gate could do better. And yes TO-247 is a very nice big package, and you can drive your metal screw with using only a pad. But this good guy is 220.
IRFBC40 2.60 EUR
IRFP9240 2.13 EUR
Hey, 0.668 Euro is one Dollar and still $1.5? Unfair!
IRFBC40 2.60 EUR
IRFP9240 2.13 EUR
Hey, 0.668 Euro is one Dollar and still $1.5? Unfair!
It's a mad mad world
mouser probably gives higher prices to the rich folks.
Dig the price below, in CDN currency, no less
Still, I get them at 20c or so.
I told you, perfect for burning prototypes 
Yeah, the depletion mosfets have their place too but for now, I'll only use them as "high voltage jfets" in ccs.
mouser probably gives higher prices to the rich folks.
Dig the price below, in CDN currency, no less
Still, I get them at 20c or so.
I told you, perfect for burning prototypes Yeah, the depletion mosfets have their place too but for now, I'll only use them as "high voltage jfets" in ccs.
Attachments
I'd love to go to one of their meetings, but it's too advanced for me. I'll just look at the annual picture show.
Now I look at the curves better, I see that up to 1A that we use them and especially around 200-300mA, the 9240 was a very nice choice for being in my drawer and accessible in all downtown shops all the time. Cool. I use 9140 now. Even better for such common a part. Ooops! Ricardo is off to the shop still wearing his pyjamas.
I am going out now.... IRFP9140 is it then ?
It's resembling the ECC88/6DJ8 on higher current, which sounds dull on recommended settings
What's the news, replacing IRF9240 by IRF941O? The higher transconductance obtained with one regulator counteracts the effects of having several regulators. Spilling 300mA at 25V gives 7.5W heat, just tolerable in a compact casing I guess.
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IRFP9140 gfs=7.9S 19A 100V 0.2 Ohm TO-247 GDS. Its in the DCB1 BOM actually as alternative.
I got the IRFP9140
Should I replace both mosfets in the shunt or just the output one ?
Ricardo
(PS: I did not go in my pijamas... )
one 2sk170 MUST be retained.
The other two can be replaced with BF244b or similar CCS connected jFETs
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