Diodes question  - Page 1
Forum section: electronics / beginners

author: Crambone
author_rank: Frequent Contributor
timestamp: September 02, 2020, 02:32:14 am
content: I’m rebuilding a rectifier board and need to replace some diodes.10D101S1942V06BNot sure what to replace them with, would like to order at mouser

author: ArthurDent
author_rank: Super Contributor
timestamp: September 02, 2020, 02:47:35 am
content: Depends. If the slightly larger lead diameter isn't a problem probably the 1N5408 will work in all locations. Do a Google search to check. If the current isn't over an amp then maybe the 1N4007 would work to replace all and be the same physical size.

author: floobydust
author_rank: Super Contributor
timestamp: September 02, 2020, 04:11:24 am
content: It sounds like a Yaesu FT-101, FT-901, FT-902, FL-2100 power supply board.The hassle is most diodes are 1A or 3A, either a bit light for the rating or a bit fat.10D10 1,000PIV 1.5A DO-41/DO-204AL package, 0.8mm leads. Replacement would be 1N5399.Upgrades could beBYT783A 1,000PIV soft-recovery in smaller SOD-64 glass package (like SF5408) but fatter 1.3mm leads might not fit the pcb without reaming.UF54083A 1,000PIV soft-recovery but it's double the size and same fat 1.3mm leads. I find vanilla 1N5408's slow switching (recovery) at high voltages and no longer use them.1S1942 200PIV 0.5A DO-15 package, 0.8mm leads. Replacement would be 1N4004-1N4007 or UF4004-4007.V06B 100PIV 1.4A DO-15 package (some pics SOD package), 0.8mm leads. Replacement would be FR203-FR207 or HER203-207 at 2A.Twirling an Exacto knife will easily ream the pcb holes 0.5mm larger, so I would use the SOD-64 glass packaged parts and maybe use all BYT78/SF5408's on the board.

author: greenpossum
author_rank: Frequent Contributor
timestamp: September 02, 2020, 04:17:04 am
content: Datasheet for 1S1942 is here:https://www.digchip.com/datasheets/parts/datasheet/939/1S1942-pdf.phpA 1N400x with 200V+ reverse holdoff should do. You can search which x is >= 200V.

author: Crambone
author_rank: Frequent Contributor
timestamp: September 02, 2020, 01:32:52 pm
content: Thanks guys

author: tkamiya
author_rank: Super Contributor
timestamp: October 03, 2020, 07:36:35 pm
content: I recall 10D10 as 1000 volt 1.0 amp. It was this way in 1980s. Spec may have changed, but if you are dealing with older equipment, that's what it was in 80s.

author: AnasMalas
author_rank: Regular Contributor
timestamp: October 04, 2020, 02:38:46 pm
content: Quote from: floobydust on September 02, 2020, 04:11:24 amYeah about that. I dont know if this device has a single sided PCB where this would be no problem, or if it is a more modern plated through hole, but yeah you definitely dont want to do this to a plated through hole. Instead if the lead doesnt fit, maybe file/grind that down instead

author: floobydust
author_rank: Super Contributor
timestamp: October 05, 2020, 04:35:34 am
content: The Yaesu rectifier boards are single-sided, they are have high voltage. The problem is 3A diodes have huge fat 1.3mm leads and the next step down is 1A parts.People sell replacement Yaesu rectifier pc boards with upgraded (3A 1000PIV) diodes on eBay.https://harbachelectronics.com/product-category/yaesu/