Full bridge rectifier questions - Page 1
Forum section: electronics / beginners

author: Electrolitty
author_rank: Contributor
timestamp: May 13, 2023, 09:10:34 am
content: I got a bunch of old (but unused) electronic parts and among these are a few three phase FBRs.I tried to find a datasheet but I couldn't find any specification about them.Maybe a forum member knows better where to search.Inscriptions on the component are " SEMTECH CDBV", "795-25" and "9132".I include a picture of each side of the component.Another question relates to the connection pins. Is there a specific socket for this type of component? It definitely doesn't look as one should try to solder these.Thanks for any help with this.

author: mikerj
author_rank: Super Contributor
timestamp: May 13, 2023, 10:40:40 am
content: Those pins (actually turrets) are designed for a wire to be wrapped around and soldered.Micross acquired Semtech a while back, they list many bridge rectifiers though none with that part number:https://www.micross.com/hi-rel-diodes/three-phase-full-wave-bridge-assemblies/I found this after a random selection, same style package with the solder turrets though I have no idea if the electrical specs are relevant to the device you have.https://www.micross.com/pdf/hi-rel-diodes-datasheets/three-phase-full-wave-bridge-assemblies/SC6BA4.pdf"9132" looks like a date code, 32nd week of 1991 so these are quite old devices.

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 13, 2023, 12:06:25 pm
content: I found thishttps://www.lintechcomponents.com/product/011595915/79525/96467

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 13, 2023, 02:29:34 pm
content: One thing that it rated for maximum reverse voltage is only 200V. I don't see many 3 phase power with voltage less than 200V.

author: bdunham7
author_rank: Super Contributor
timestamp: May 13, 2023, 02:51:55 pm
content: Quote from: BeBuLamar on May 13, 2023, 02:29:34 pmThere are (or were, anyway) three-phase transformers for 24 and 48VAC for various purposes from control electronics to battery charging. Welding too, but I doubt that rectifier is going to work for DC welding.

author: MrAl
author_rank: Super Contributor
timestamp: May 14, 2023, 05:25:21 am
content: Quote from: Electrolitty on May 13, 2023, 09:10:34 amHi,That "25" could be 25 amps or 250 volts.Without a datasheet you'd have to do some careful testing. Not sure what test equipment you have.

author: Electrolitty
author_rank: Contributor
timestamp: May 14, 2023, 05:30:40 pm
content: Thank you everybody for your input.It is more out of curiosity that I want to know more about this component. I usually do not work with voltages or currents where it starts to get really dangerous. Three phase rectification is also a topic that is not really on my agenda. But I'll try to test the component on a standard transformer with 30 or 40 Volts secondary output, of course connected to an isolation transformer and in a first phase with a current limitation through light bulbs.Should anybody come across a datasheet, I'll be happy to hear from you.Cheers

author: MrAl
author_rank: Super Contributor
timestamp: May 14, 2023, 11:49:46 pm
content: Quote from: Electrolitty on May 14, 2023, 05:30:40 pmHi,Just to note, you can use with single phase too. Two diodes wont be used then.

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 15, 2023, 11:26:18 am
content: To test it you can use the diode check function of a DMM. You can also connect a single phase low voltage AC (like 12VAC from a transformer) to 2 of the AC terminal and you would have the pulsed DC voltage out of the 2 DC terminals.

author: MrAl
author_rank: Super Contributor
timestamp: May 15, 2023, 12:00:49 pm
content: Hi,I was going to suggest a DC voltage versus leakage test, along with a DC current versus forward voltage drop versus package size test.The voltage and current specs can then be extracted from the test data.