SB190 rectifier diode alternative

[mikay786]

I'm just troubleshooting this Toshiba combo vhs / dvd recorder.

I've got a diode that's flaring up on the thermal cam so looking to replace

Marking are SB190 which shows it as a 90v 1A schotky diode.

Only thing close I can fine is a 100v one

https://www.ebay.co.uk/itm/192048920321

Will that do the job?

[pavithra_uk]

Re: SB190 rectifier diode alternative

SB1100 is perfectly fine.
it is same diode as SB190 with higher voltage

[redwire]

Re: SB190 rectifier diode alternative

It's strange to have such a high voltage rectifier in a DVD combo player, usually they are 12V and 5V rail kind of thing.
The penalty using Schottky diodes with higher rated PIV is losses go up, they make more heat due to their higher voltage drop. SB170-SB1100 datasheet

[pavithra_uk]

Re: SB190 rectifier diode alternative

It's strange to have such a high voltage rectifier in a DVD combo player, usually they are 12V and 5V rail kind of thing.
The penalty using Schottky diodes with higher rated PIV is losses go up, they make more heat due to their higher voltage drop. SB170-SB1100 datasheet

I found several LED backlit monitors with LED supply voltage less than 20V but using 200V schottkey diodes in power supply rail. and they failed after some time. this can be the cause. but don't know why they use high voltage diodes.