FS: Reel of Vishay WSR-2 R01 10mOhm 1% 2W current sense resistors - Page 1
Forum section: electronics / general

author: owiecc
author_rank: Frequent Contributor
timestamp: October 10, 2013, 06:33:51 pm
content: SMD size 4527Qty: ca. 1420I can sell a part of it. Price: lower than Farnell/RS/eBayShipping from Denmark. Shipping costs depend on qty.

author: echen1024
author_rank: Super Contributor
timestamp: October 13, 2013, 04:37:31 am
content: How much for 10? Ship to US

author: Christopher
author_rank: Frequent Contributor
timestamp: October 13, 2013, 02:53:40 pm
content: ^ farnell etc are probably better for small-qty

author: owiecc
author_rank: Frequent Contributor
timestamp: October 13, 2013, 02:58:32 pm
content: I took Digikey's price and cut it in half:qty$/pc$10.6600.66100.6126.12500.52726.351000.46846.752500.425106.255000.391195.5Weigh is approx. 0.44g/pc.Calculate shipping cost here:http://www.postdanmark.dk/Find prisen. Choosebrevfor letter andpakkefor package (if you want a lot). Choose your country to calculate shipping costs.

author: sorin
author_rank: Frequent Contributor
timestamp: October 14, 2013, 03:15:52 pm
content: http://www.ebay.com/itm/4005695561735mOHM25pcs $7 (with free shipping for USA)

author: owiecc
author_rank: Frequent Contributor
timestamp: October 14, 2013, 03:41:06 pm
content: Quote from: sorin on October 14, 2013, 03:15:52 pmWell, if you need 10mOhm then you need twice as many. Plus the shipping outside US is not free. If you can find a better deal go for it.If you buy _a lot_ I can match cheaper offers. But for 10/20pcs it is not worth for me.

author: Jon86
author_rank: Frequent Contributor
timestamp: October 17, 2013, 06:17:30 pm
content: Those are 50mOhm...

author: SeanB
author_rank: Super Contributor
timestamp: October 17, 2013, 07:24:25 pm
content: Danish Post office needs to update country list a little. Republic of South Africa changed name to South Africa only 19 years ago..........

author: owiecc
author_rank: Frequent Contributor
timestamp: October 17, 2013, 08:55:56 pm
content: Wikipedia says Republic of South Africa is the official name. Like Republic of Poland is the official name of Poland. I guess it is not to confuse South Africa with geographical south Afrika. Similarly south of Poland in not called sydpolen (which in theory is correct because syd=south, polen=Poland) because Sydpolen is actually the South Pole.

author: BravoV
author_rank: Super Contributor
timestamp: October 26, 2013, 05:28:52 am
content: Got mine today, thanks !Have to admit shipping cost from Denmark is relatively cheap compared to that eBay deal, and 0.01R is a lot nicer.

author: codeboy2k
author_rank: Super Contributor
timestamp: October 26, 2013, 11:27:10 pm
content: Quote from: BravoV on October 26, 2013, 05:28:52 amI'll think I'll buy 30 too@owiecc do you still have these?

author: owiecc
author_rank: Frequent Contributor
timestamp: October 27, 2013, 10:12:25 am
content: Sure, I still have a lot. PM me and we'll talk details.

author: codeboy2k
author_rank: Super Contributor
timestamp: November 12, 2013, 07:04:25 am
content: Got mine today, thanks once again!It seems it took about 10 days shipping, not too bad

author: owiecc
author_rank: Frequent Contributor
timestamp: November 12, 2013, 08:24:09 am
content: Quote from: codeboy2k on November 12, 2013, 07:04:25 amPost says it should be 4-6 days but maybe it should 4+6 days insteadFor those that did not buy yet. As you can all see I still have around 1300 resistors so order yours today. It's you only chance to make a cheap distributed 130ohm resistor. Dissipate up to 2.6kW /stops speaking in infomercial voice/.

author: SeanB
author_rank: Super Contributor
timestamp: November 12, 2013, 08:05:28 pm
content: Got mine as well, nicely packed in a padded box, even serialised as to where they came off the reel.

author: BravoV
author_rank: Super Contributor
timestamp: November 13, 2013, 05:05:57 am
content: At the datasheet for this particular 10 mOhm 2 Watt, it says :- Temperature coefficient : +/- 75 ppm/C- Element TCR : < 20 ppm/CNoob question, what are these ? Why two types of temp co ?

author: owiecc
author_rank: Frequent Contributor
timestamp: November 13, 2013, 03:09:07 pm
content: One is the TCR for the whole device (leads+resistive element) and the other one is TCR of resistive element only.

author: codeboy2k
author_rank: Super Contributor
timestamp: November 13, 2013, 05:30:14 pm
content: I wish the data sheets for resistors (especially power resistors) also had a line showing thermal resistance from the element to the package and from the package to air.With this information I can determine the rise in temperature based on the power dissipation, and this helps give more meaning to the tempco, especially as I am using these for current sensing and want to know how it will impact the accuracy.

author: BravoV
author_rank: Super Contributor
timestamp: November 14, 2013, 04:57:03 am
content: I think I worded my question wrongly, codeboy2k post above represents it more properly about the thermal resistance from inside to outside.Cause there is no relationship between the element tempco which is fully sealed and encased inside vs the whole resistor body (include the leads) tempco, which makes the element tcr tempco become pointless, cmmiw.

author: codeboy2k
author_rank: Super Contributor
timestamp: November 14, 2013, 06:08:03 pm
content: Quote from: BravoV on November 14, 2013, 04:57:03 amNo, I think your question above was worded perfectly fine. The datasheet DOES have 2 tempco's, and your question was why is there 2.user owiecc answered it correctly, one is just the element, the other is the whole device. But as you said:Quoteand that is exactly correct. Any calculation I do on the resistor I have to use the device TCR, I just ignore the element TCR, because I always want worst case errors.

author: BravoV
author_rank: Super Contributor
timestamp: November 15, 2013, 01:59:44 am
content: I think we have to agree that the nice&low element tempco figure was "forcefully" inserted by marketing dept. into the datasheet.

author: owiecc
author_rank: Frequent Contributor
timestamp: January 27, 2014, 08:49:14 pm
content: Small bump. I still have a lot of them. Anyone interested?