Identifying a new micro SMD bridge rectifier - Page 1
Forum section: electronics / beginners

author: pauljmccain
author_rank: Contributor
timestamp: January 09, 2016, 08:00:43 pm
content: Hello,I came across this tiny little SMD brdige rectifier in a Chinese product, but have no idea where it came from. I'd love to use it in a design I'm working on.I know it's rated to at least 20V, and at least 200mA.Similar package to the newer 2320 chip from Bournes (https://www.bourns.com/pdfs/CD2320-B.pdf), but it's exactly 33% smaller. Anyone have any idea?Thanks!

author: Dago
author_rank: Frequent Contributor
timestamp: January 09, 2016, 08:25:52 pm
content: There seem to be at least TO-253-4 packaged devices which are smaller and have equivelant or better ratingshttp://www.digikey.fi/product-detail/en/BAS%203007A-RPP%20E6327/BAS3007A-RPPE6327INCT-ND/2023144

author: pauljmccain
author_rank: Contributor
timestamp: January 09, 2016, 08:42:33 pm
content: Thanks for the suggestion! I'll use that if I can't figure it out, but I'm hoping this one might have a better price and thermal properties with the chip-style package.

author: pauljmccain
author_rank: Contributor
timestamp: January 14, 2016, 03:31:50 am
content: In case anyone else is looking, I was actually able to find this. Brand new chip size out of Taiwan, seems to be only two manufacturers. Shoot me a PM for link if you need it!

author: jancumps
author_rank: Unknown
timestamp: January 14, 2016, 04:28:06 am
content: Why PM? Can you please post the link?

author: pauljmccain
author_rank: Contributor
timestamp: January 14, 2016, 06:26:33 am
content: Sorry, the one I found was embedded behind a login, so a link wouldn't do any good.I did just find a direct link though:http://www.secosgmbh.com/datasheet/products/new_series/MBCN/MB10M.pdfPretty cool little chip.

author: jancumps
author_rank: Unknown
timestamp: January 14, 2016, 06:40:00 am
content: thanks!

author: tszaboo
author_rank: Super Contributor
timestamp: January 14, 2016, 02:53:27 pm
content: The Bourns part handles 400V+ so it can be used in those awful capacitive dropper power supplies. But this is only 20V. May I ask, what is the point? The only parts giving out 20V are transformers, and they are huge. PoE is not ok... Is this for some kind of small generator or something?

author: Zero999
author_rank: Super Contributor
timestamp: January 14, 2016, 02:57:24 pm
content: In the case of a capacitive power supply, most of the voltage is dropped in the capacitor and the voltage dropped across the bridge rectifier depends on the load which could be a TL431 set to 5V.

author: pauljmccain
author_rank: Contributor
timestamp: January 14, 2016, 03:07:33 pm
content: Quote from: NANDBlog on January 14, 2016, 02:53:27 pmI do 12V electronic design. And I'm sure there's applications for other things at low voltage levels where you might not want four components.

author: mikerj
author_rank: Super Contributor
timestamp: January 14, 2016, 04:11:44 pm
content: Quote from: pauljmccain on January 14, 2016, 03:07:33 pmI think the point is that if you already have the space for a power transformer, then it's unlikely you'll be worried about saving a mm or so on the rectifier.

author: pauljmccain
author_rank: Contributor
timestamp: January 14, 2016, 05:37:37 pm
content: Quote from: mikerj on January 14, 2016, 04:11:44 pmWell, you can design your way and I'll design mine. In what I do, every tenth of a mm counts!

author: pauljmccain
author_rank: Contributor
timestamp: January 14, 2016, 06:05:44 pm
content: Quote from: blueskull on January 14, 2016, 05:40:09 pmVery cool, checking those out. Thanks!

author: tszaboo
author_rank: Super Contributor
timestamp: January 14, 2016, 06:11:10 pm
content: Quote from: Hero999 on January 14, 2016, 02:57:24 pmI get that. Still, can you use a diode bridge, with much less voltage rating? I would have guessed that the actual reverse voltage can be higher, during turn on, transients etc... For exapmle turning it on when the voltage is maximum?Quote from: mikerj on January 14, 2016, 04:11:44 pmRight. So I guess it might be worth mentioning, that SMPS should be smaller, unless the power is really low, ~0.1W psu.