This is a diode from a small 5 Vdc power supply that is part of a powered subwoofer. Main supply voltages of about plus minus 45 Vdc look to be okay but the little 5V supply appears to be dead.

A quick check shows that this diode is shorted. Markings are (top) V1H (bottom) P133L

Google isn't much help (or I'm using the wrong search terms). Closest I can see is a Turkish supplier website that suggests this is a 100V 3A part. However, no hint of speed.

Unknown Diode

Any suggestions of what this might be greatly appreciated!

  • \$\begingroup\$ you can hack in your own brand new 5v supply of you can find where the burned-out one was fed, but keep in mind there could be a good reason the oem 5v reg died, like something downstream failing short. \$\endgroup\$
    – dandavis
    Jan 29, 2022 at 9:24
  • \$\begingroup\$ That was going to be my 2nd choice. Goodness knows how many times I've done exactly that previously. I actually keep a stock of small 5V 3A 90..250 Vac power supply modules on hand for just that situation. But I'd like to fix the existing supply if all it takes is a diode. \$\endgroup\$ Jan 29, 2022 at 18:41

2 Answers 2


The very first item that a quick google of "diode V1H" throws up is this site
Scrolling down a bit you find a section headed "DIODE V1h Marking Code Datasheets Context Search".
Follow the link to the data sheet PDF.

  • \$\begingroup\$ I had found that site but the devices listed in the page that is visible in my browser are for a quad TVS in a 6-pin package. It did not occur to me to scroll way further down the page. Lesson learned! \$\endgroup\$ Jan 29, 2022 at 1:39
  • \$\begingroup\$ So that part appears to be a 2.1A 60V Shcottky diode. Many thanks! \$\endgroup\$ Jan 29, 2022 at 1:40
  • \$\begingroup\$ @DwayneReid Yes, a Schottky diode fits what we know about the circuit (low voltage power supply). It sounds highly likely. \$\endgroup\$ Jan 29, 2022 at 12:16
  • \$\begingroup\$ This diode is in the primary side of the supply. Unfortunately, the traces dive underneath the transformer. I can trace it but it will be a pain in the butt. \$\endgroup\$ Jan 29, 2022 at 18:38
  • Manufacturer: Vishay Intertechnology, Inc
  • Manufacturer part number: VS-10BQ060PBF (obsolete!!)
  • Data sheet: click

enter image description here

  • Manufacturer part number (substitute): VS-10BQ060-M3
  • Data sheet (substitute): click
  • Distributor link (substitute): click
  • Part type: Schottky rectifier

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