Sourcing precision resistors / sealed vref - Page 1
Forum section: electronics / general

author: alex-sh
author_rank: Regular Contributor
timestamp: February 21, 2023, 10:08:38 am
content: Hi,I was trying to source the Vishay resistor - Vishay VHD divider.47 weeks lead time ))I think this is a good idea if other forum members can share where they are sourcing parts - precision resistors or metal can vrefs

author: sahko123
author_rank: Frequent Contributor
timestamp: February 21, 2023, 10:38:25 am
content: For the most part if you want something custom then you would need to wait those 47 weeks. maybe less maybe more depending on their current demand and the quantity

author: alex-sh
author_rank: Regular Contributor
timestamp: February 21, 2023, 10:51:22 am
content: No, I do not want custom made resistorsThese are used to be available, but now due to covid, huge problem to source even such common values:Vishay VHD divider - 10k/25.2kVishay Z202 - 1kVishay Z202 - 350

author: alex-sh
author_rank: Regular Contributor
timestamp: February 21, 2023, 10:52:16 am
content: Quote from: sahko123 on February 21, 2023, 10:38:25 amI will not wait for 47 weeks.I'd rather order custom made resistors. I think it will be much quicker.

author: mendip_discovery
author_rank: Super Contributor
timestamp: February 21, 2023, 06:11:37 pm
content: If you order custom ones then you will be looking at least 47 weeks.I would love to know the real reason for the slowing up at the manufacture of the resistors. Did they loose some key staff? Has the higher ups made decisions that are slowly shutting down the business?

author: alex-sh
author_rank: Regular Contributor
timestamp: February 23, 2023, 10:25:15 pm
content: Quote from: mendip_discovery on February 21, 2023, 06:11:37 pmHow can 1k resistor be a custom made? This is a standard low tempco resistor.I wonder how others are coping with such an issue?

author: mendip_discovery
author_rank: Super Contributor
timestamp: February 24, 2023, 01:55:09 pm
content: Quote from: alex-sh on February 23, 2023, 10:25:15 pmOK then, made to order would be a better way to put it. The stuff on the shelf has gone, they seem to be in a position of making stuff to order rather than getting spare stock onto the shelves. The process for making a 1k vs a 1.1k etc is the same, it is the same people on the same machines just aiming for different end values.

author: alex-sh
author_rank: Regular Contributor
timestamp: February 27, 2023, 08:05:46 pm
content: Quote from: mendip_discovery on February 24, 2023, 01:55:09 pmRight.Now back to the topic - anyone knows anyone who can make a custom precision resistors quicker than 47 weeks?

author: TimFox
author_rank: Super Contributor
timestamp: February 27, 2023, 08:31:19 pm
content: Before retirement, I often dealt with Texas Componentshttps://www.texascomponents.com/store/home.aspfor custom-value Vishay foil resistors.They offer quick delivery--my work experience was pre-plague, but they definitely were fast.I believe they stock raw dice from Vishay, then trim and package them to order.You don't indicate your country of residence--I don't know their export policy.

author: CosteC
author_rank: Regular Contributor
timestamp: March 01, 2023, 03:26:36 pm
content: Quote from: alex-sh on February 21, 2023, 10:08:38 amYou did not specify value or accuracy needed, not sure where you are geographically, but I know at least two companies around making custom thick film resistors/dividers. Funny fact is tolerance is poor but division ratio is stable as well as temperature coefficients.No idea however how their delivery time looks now.

author: alex-sh
author_rank: Regular Contributor
timestamp: March 04, 2023, 09:25:19 pm
content: Quote from: TimFox on February 27, 2023, 08:31:19 pmIts the UK.And I order many components from the USA so its ok. +20% VAT ((

author: alex-sh
author_rank: Regular Contributor
timestamp: March 04, 2023, 09:28:29 pm
content: Quote from: CosteC on March 01, 2023, 03:26:36 pm± 0.2 ppm/°CFrom 0.001%Various values to build LTZ1000A 10V booster.And its the UK, but it does not matter - the world is global now

author: CosteC
author_rank: Regular Contributor
timestamp: March 05, 2023, 01:44:47 am
content: Quote from: alex-sh on March 04, 2023, 09:28:29 pmGot guys with 0.01% so 10x worse than you need.Not this application - this is very low voltage stuff.Sorry. Anyway this is interesting topic, keeping such accuracy it difficult task, with thermal gradients, Seeback effects and other nasty stuff. Climatic category is next wide topic..Quote from: alex-sh on March 04, 2023, 09:28:29 pmWord is less and less global. Brexit, China is semi closed, Russia under sanctions, war in Ukraine. Pre-Brexit shipment PL-UK was 3 days normal. Now "normal" is close to two weeks. Express is rarely 3 days.