Suitable Replacement for F12C20CT Common Cathode Rectifier Diode

Thread Starter

dmarciano84

Joined Oct 1, 2023
36
I am looking into building my first SMPS to convert 120VAC to 5VDC @ 10A. I have been reading and looking up schematics and found one that a good schematic and list of components that I wanted to try and replicate. However, there is one component that I can't find; it is a common cathode rectifier F12C20CT.

This component is apparently made by a company called ThinkiSemi which I personally have never heard of. I could order it through their website, but I am not comfortable with that, eBay only has a single listing for pre-owened ones, and my usual sites (DigiKey, Mouser, and Jameco) don't carry them. I looked up its datasheet and tried to find a close match. The closest match that I could find on DigiKey was the SFF1604GH.

As I have never built a SMPS previously, and never have had to use a rectifier diode either, I was curious if anyone has ever seen this component (i.e., F12C20CT), if the SFF1604GH would be a suitable replacement, and/or if there are any other recommended parts that could be suggested.

TIA
 

k1ng 1337

Joined Sep 11, 2020
906
Here are the main parameters of interest for SMPS. Choose a diode with these minimum specs according to F12C20CT datasheet:

- Maximum Reserve Voltage > 200VDC / 140VAC

- Maximum Forward Current > 12A

- Reverse Recovery Time < 150ns

Post the SMPS schematic if you have it. You'll get better answers.
 

Thread Starter

dmarciano84

Joined Oct 1, 2023
36
Here are the main parameters of interest for SMPS. Choose a diode with these minimum specs according to F12C20CT datasheet:

- Maximum Reserve Voltage > 200VDC / 140VAC

- Maximum Forward Current > 12A

- Reverse Recovery Time < 150ns

Post the SMPS schematic if you have it. You'll get better answers.
Those were the main values I was comparing. For the 1604G it has the values"

  • Repetitive Peak Reverse Voltage: 200V
  • Reverse Voltage (Total RMS Value): 140V
  • Forward Current 16A
  • Reverse Recovery Time: 35ns

so it seemed to be sufficient but wasn't sure if these were the only values I should be comparing for this application. The schematic I am referencing is this:
1701711581454.png
 

k1ng 1337

Joined Sep 11, 2020
906
Those were the main values I was comparing. For the 1604G it has the values"

  • Repetitive Peak Reverse Voltage: 200V
  • Reverse Voltage (Total RMS Value): 140V
  • Forward Current 16A
  • Reverse Recovery Time: 35ns

so it seemed to be sufficient but wasn't sure if these were the only values I should be comparing for this application. The schematic I am referencing is this:
View attachment 309119
They are on the output so it should be alright. I can't comment on the circuit itself since I've never built an AC-DC converter.

Do you understand what the circuit is doing? If not, it might be a good idea to stick to low voltage DC-DC converters. High voltage AC can be dangerous if the feedback mechanism is disturbed.
 
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