# Need assistance identifying a diode in an smp power supply **URL:** \ **Category:** Discrete Semiconductor Products\ **Tags:** sanken, diodes, cross-reference\ **Created:** [July 15, 2021, 9:53pm UTC](https://forum.digikey.com/t/need-assistance-identifying-a-diode-in-an-smp-power-supply/15453 "2021-07-15T21:53:49Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![allen305](https://avatars.discourse-cdn.com/v4/letter/a/8e8cbc/32.png) [@allen305](https://forum.digikey.com/u/allen305)\ **Post date:** [July 15, 2021, 9:53pm UTC](https://forum.digikey.com/t/need-assistance-identifying-a-diode-in-an-smp-power-supply/15453/1 "2021-07-15T21:53:50Z")
I have a diode rectifier which I need to replace in an SMP power supply, see attached pictures. The diode is identified as D6 on the circuit board (denoted by white arrow in pictures). ![Panasonic VHS VCR - PV4160A1 Diode D6 01 Exploded View](https://global.discourse-cdn.com/digikey/original/3X/f/7/f7082009859cf3045e3051a5e55e38ed9ce7f871.jpeg) ![Panasonic VHS VCR - PV4160A1 D6 Diode1M](https://global.discourse-cdn.com/digikey/original/3X/8/f/8fd9bb3bd737f846e49ceeaf9505e45f90c8fa56.jpeg) ![Panasonic VHS VCR - PV4160A1 D6 Diode Circuitboard Exploded View](https://global.discourse-cdn.com/digikey/original/3X/f/8/f829547c2aa7e89d54e352595608dfb6d8e03929.jpeg) The diode is from Panasonic VHS VCR model PV4160A1. Unfortunately, I cannot find a schematic for this model. I did find a schematic for a similar model, Panasonic PV4601, which lists 2 replacement part numbers: ERB32-01L3 and RUK2YXFC1. I don't know if either could be substituted for D6 on my SMP. Any help would be appreciated. Thanks! ---
**Author:** ![Michael\_Rudi](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/michael_rudi/32/6162_2.png) [@Michael\_Rudi](https://forum.digikey.com/u/Michael_Rudi)\ **Post date:** [July 15, 2021, 10:41pm UTC](https://forum.digikey.com/t/need-assistance-identifying-a-diode-in-an-smp-power-supply/15453/2 "2021-07-15T22:41:17Z")
Hello Allen305 and welcome to the TechForum. I have no reference to the part you image. Can you enumerate the markings on that diode? I don’t know if I’ll be able to derive it but I’ll give it a shot. ---
**Author:** ![allen305](https://avatars.discourse-cdn.com/v4/letter/a/8e8cbc/32.png) [@allen305](https://forum.digikey.com/u/allen305)\ **Post date:** [July 15, 2021, 11:41pm UTC](https://forum.digikey.com/t/need-assistance-identifying-a-diode-in-an-smp-power-supply/15453/3 "2021-07-15T23:41:41Z")
The D6 diode, shown in my picture, has the following markings: Brown stripe marks cathode; 01 (large font); 1 3 (3 could be a symbol); **:** (2 dots vertical orientation); C 3 (3 could be a symbol). I tested the diode on my ESR meter: Ir=0.14 uA ; uF=492 mV ; C=49 pF. Unfortunately, I have no datasheet or schematic for the VCR. ---
**Author:** ![JohnMHanninen](https://avatars.discourse-cdn.com/v4/letter/j/82dd89/32.png) [@JohnMHanninen](https://forum.digikey.com/u/JohnMHanninen)\ **Post date:** [July 16, 2021, 12:00am UTC](https://forum.digikey.com/t/need-assistance-identifying-a-diode-in-an-smp-power-supply/15453/4 "2021-07-16T00:00:18Z")
I did locate some information online showing the diode as a 100v 1.2 amp diode. I located this Sanken part number EM 2V1 or Digi-Key part number EM2V1CT-ND For the web link [click here](https://www.digikey.com/en/products/detail/sanken/EM-2V1/4572555?s=N4IgjCBcoGwJxVAYygMwIYBsDOBTANCAPZQDaIALGGABxwDsIAuoQA4AuUIAyuwE4BLAHYBzEAF9CcGIhApIGHAWJlKABnpwAzDWZtOkHv2FjJIOGAqz5ivIRKRyFGlvqNCFelrAzCAVjU4NS0QfwAmGktQkD8I6j0QDi5eQVEJQjA4Oms0LDsVRxA1BKTDFJN0kDCNCGg5XKV7VTA1NQACADVoilbOkoMQAFUhAXYAeVQAWVx0bABXPlxKgFownMh%2BOeUHcj9mM2WEOvlN7eb9szXCgBMBImulpnEgA) This is a 400v 1.2a so it should work for you. ---
**Author:** ![allen305](https://avatars.discourse-cdn.com/v4/letter/a/8e8cbc/32.png) [@allen305](https://forum.digikey.com/u/allen305)\ **Post date:** [July 16, 2021, 1:16am UTC](https://forum.digikey.com/t/need-assistance-identifying-a-diode-in-an-smp-power-supply/15453/5 "2021-07-16T01:16:53Z")
Thanks for the information. I ordered the suggested diode from DigiKey. What does the brown cathode, numbers and letter mean on the diode? ---
**Author:** ![allen305](https://avatars.discourse-cdn.com/v4/letter/a/8e8cbc/32.png) [@allen305](https://forum.digikey.com/u/allen305)\ **Post date:** [July 19, 2021, 11:37pm UTC](https://forum.digikey.com/t/need-assistance-identifying-a-diode-in-an-smp-power-supply/15453/6 "2021-07-19T23:37:52Z")
The diode length is 7.5 mm and the diameter is 3mm (approx). ---
**Author:** ![Michael\_Rudi](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/michael_rudi/32/6162_2.png) [@Michael\_Rudi](https://forum.digikey.com/u/Michael_Rudi)\ **Post date:** [July 20, 2021, 12:14am UTC](https://forum.digikey.com/t/need-assistance-identifying-a-diode-in-an-smp-power-supply/15453/7 "2021-07-20T00:14:39Z")
I wasn’t able to find a reference to the meaning of those markings allen305, I wouldn’t correlate the size of the Diode to the application too much though. Manufacturing processes over time have allowed for gains in size/compactness of electrical components.