I have a headphone amp that uses a couple of these to drive the transformer in a DC-DC converter. Like so many TH components, these low-power Mosfets are no longer made. Key spec seems to be the low on-resistance (0.3-0.4 Ohms).
I've never spec'ed mosfets before so I wanted to get some input. Two possible replacements are Vishay VISHS85750 and Diodes Inc/Zetex ZVN4306AV.
Wha'dya think?
I've never spec'ed mosfets before so I wanted to get some input. Two possible replacements are Vishay VISHS85750 and Diodes Inc/Zetex ZVN4306AV.
Wha'dya think?
I assumed the data sheet has a typo; "Rds(off)" should be "Rds(on)"
My concern is more the power dissipation. Over 800mw in a TO-92 package is pretty rare these days (perhaps always?), based on my spelunking with the Digikey search tools. I only got 2 hits for
* MOSFET
* N-channel
* TO-92 package
* over 900mA Id
and they were the Diodes Inc. ZVN4306 and ZVN4310. Maybe 850mW would suffice.
Hard to tell how close they were designing it without a schematic or some measurements. A 60V-rated part in an HPA?
These days, they seem to use TO-220 package.
Kind regards,
Drew
My concern is more the power dissipation. Over 800mw in a TO-92 package is pretty rare these days (perhaps always?), based on my spelunking with the Digikey search tools. I only got 2 hits for
* MOSFET
* N-channel
* TO-92 package
* over 900mA Id
and they were the Diodes Inc. ZVN4306 and ZVN4310. Maybe 850mW would suffice.
Hard to tell how close they were designing it without a schematic or some measurements. A 60V-rated part in an HPA?
These days, they seem to use TO-220 package.
Kind regards,
Drew
Thanks Drew. Yeah, offerings in the 92L package are pretty much gone and I don't think there's room for a TO-220, it's a pretty dense layout. I used 1A Id and <500mOhm Rds(on) for my scan, with only two results. I ordered some of the ZVN4306 from Digikey but USPS appears to have lost the package. 🙁
Last night I found another possibility in one of my junk boxes, some IRFU110's (TO-251).
Schematic is attached (Q31 and Q32).
Last night I found another possibility in one of my junk boxes, some IRFU110's (TO-251).
Schematic is attached (Q31 and Q32).
Attachments
The ZVN4306 's arrived yesterday, along with a new SG3524. These ZVN's are the little "Eline" package, which may explain the low power rating. We'll see if they hold up.
Just to wrap this up, the ZVN4306's are working fine, so a good sub for the K975 (note the different lead pinout, though).