Trying to figure out what this resistor is - Page 1
Forum section: electronics / repair

author: Bi0
author_rank: Newbie
timestamp: August 14, 2024, 04:21:45 am
content: Hey all,I have an Ego battery that is new from this year (already got a replacement want to try fixing this one too). On the BMS, they changed to using a smd resistor or fuse marked 510 with a line over it. Package size is 1206. I opened the replacement battery and that is how I found this, I measured it and it does have a resistance of 51 ohms. I did find some fuses that have the line above for fast acting and line below for lag time. But I'm guessing that this isn't the case here since it's a 51 ohm resistor. Anyone have any idea what that line might be designating?

author: gamalot
author_rank: Super Contributor
timestamp: August 14, 2024, 04:53:20 am
content: 01S = 10 ohmSorry I didn't read it carefully.

author: Bi0
author_rank: Newbie
timestamp: August 14, 2024, 04:54:54 am
content: Quote from: gamalot on August 14, 2024, 04:53:20 amSo I thought this as well. But if you did it that way the 1 would be upside down.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: August 14, 2024, 12:25:23 pm
content: Fusible Resistor??

author: bastl_r
author_rank: Regular Contributor
timestamp: August 14, 2024, 12:31:03 pm
content: For a fuse the traces are to small, i think.

author: Bi0
author_rank: Newbie
timestamp: August 14, 2024, 03:57:05 pm
content: Quote from: Wallace Gasiewicz on August 14, 2024, 12:25:23 pmThis is what I was thinking, but I can not find a smd fusible resistor that's 51 ohms. Was tempted to just use a normal 51 ohm resistor and see what happens...but I'm also not -totally- sure what would happen if it needs to blow if it would cause issues vs a fusible resistor.

author: Smile2016
author_rank: Regular Contributor
timestamp: August 14, 2024, 04:26:02 pm
content: 51 Ohms , red ink is probably tolerance <1%

author: Bi0
author_rank: Newbie
timestamp: August 14, 2024, 05:03:07 pm
content: Quote from: Smile2016 on August 14, 2024, 04:26:02 pmI wasn't sure about the red ink since the blown one was white ink.I found 2 promising resistors: 1206 package, 51 ohms - one is .5% tolerance and 1w and the other is .1% tolerance and .25w. I measured the working battery and there's about .19w over that smd.My main concern was if this is a fusible resistor, would it matter if I just use a resistor that much?

author: Bi0
author_rank: Newbie
timestamp: August 19, 2024, 12:05:19 am
content: A user on reddit was actually able to figure out what this is and figured I would post here should anyone be looking in the future. TLDR it's NCR's marking system for non-trimming resistors. The specs are pretty close to the .25w resistor I was already looking at. Here's a spec sheet for it:https://www.smart-ele.co.kr/wp-content/uploads/2022/07/ncr_spec_sheet.pdf

author: ArdWar
author_rank: Frequent Contributor
timestamp: August 20, 2024, 02:03:10 am
content: What is "non-trimming resistors"?Is it film resistor that are full deposit and aren't cut trimmed? Implying full width current path and maybe higher surge withstand capacity?

author: TimNJ
author_rank: Super Contributor
timestamp: August 20, 2024, 02:16:19 am
content: I recognized the pink text from TA-I’s catalog (series RAS):https://www.tai.com.tw/product/5c8yP3CZM4PXDqq7/685ZtD4gg2Qm5uXfI don’t think text color is at all standardized to mean anything(?) Does the hat over the first number really indicate anything about type?

author: Bi0
author_rank: Newbie
timestamp: August 22, 2024, 09:27:32 pm
content: Quote from: ArdWar on August 20, 2024, 02:03:10 amI had to look it up too. Basically normal resistors they use a laser to trim them and basically fine tune them to the exact resistance. These I guess they don't "trim" at all and are just made to a super high tolerance from the start. From the sounds of it allowing for a higher max working voltage.