Juha First of all, there appear to be 2 different request for a resistor supplier out there on the list with the same subject line within a week of each other, looking for different kinds of resistors. This is in response to you looking for a sense resistor.
It appears that at least some of the responders to your question do not know what a sense resistor is. A "sense resistor" is the actual name of a special type of precision low ohmage, high wattage, precision tolerance (usually less than 1%) resistor, which is used to sense current flow in a given circuit by measuring the voltage drop across the KNOWN resistance, and the best way to look for one is to do a search on the web using +SENSE +RESISTOR (with the plus in front of each word). This will render a number of "hits", all related to sense resistors, but most links not going to the resistors themselves, although you will find a few. As a side note, I have not been able to find anything that looks very suitable in the new Digikey Catalog, and since the resistance value has to be specifically known, it will not do to attempt to make one out of a copper trace as one responder suggested. Needless to say, IRC would be my first choice. Have you looked thru their entire product line, or done a search at their site for "sense" or "sense resistor"? Have you thought about trying to get some samples directly from IRC? Their website is at: ===> http://www.irctt.com If you can't find anything there, you might want to try a company called ISOTEK, and the following link may be a start to solving your problem, although the tolerance seems to be outside the ballpark: ===> http://www.isotekcorp.com/pdf/SMK-New.pdf Please remember that if you cannot find the exact value that you need that you can combine two or more resistors (including sense resistors) in parallel to get the exact value that you want. This also will allow you to use lower wattages since each parallel resister is carrying only part of the load. I know that I have seen several very small surface mount tubular sense resistors in circuitry that has come from Japan and China, but have never been able to actually track down a source for them. You may be able to find a surface mount tubular sense resistor close in size to what you need, but remember that the tubular type resistors require their own special footprint. By the way, if you actually do find a good source for small surface mount tubular sense resistors, please pass it on to me. JaMi Smith Optical Crossing Inc. Glendale CA * * * * * * * * * * -----Original Message----- From: Juha Pajunen [mailto:[EMAIL PROTECTED]] Sent: Tuesday, January 22, 2002 4:37 AM To: Protel EDA Forum Subject: [PEDA] Looking for a resistor supplier. Hi, Looking for 0.004R (2512 footprint, 1-2W) sense resistor for switching power supply, can you help me? I have one (IRC LRF 2512-01-R004-J http://www.welwyn-tt.com/lrc_fr.htm ) but distributor says that you have to get 1800 (I need 100-200), you know where can get less? Sincerely, Juha Pajunen, Hw Engineer Bitboys Oy E-mail: [EMAIL PROTECTED] ------------ NOTE: This message, and any attached files, may contain privileged or confidential information. It is intended for use only by the designated recipients. Any disclosure, copying or distribution of, or reliance upon, this message by anyone else is strictly prohibited. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
