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Non-inductive options for high speed and low inductance power applications...


RALEIGH, NC (July 17, 2007) – Stackpole Electronics, Inc. introduces their non-inductive version of the standard conformal coated, leaded, wirewound series the WW.  Designated the NWW this product offers the same robust performance expected from a wirewound technology with the added characteristic of vastly improved inductance.  This non-inductive winding is available in all standard WW sizes from .6 watts up to 13 watts.

Wirewound technology has long been known as a leading technology for power resistor needs.  The most critical drawback with this technology is that it is inherently inductive.  This is logical given that a wirewound inductor and a wirewound resistor are made with essentially the same materials and processes.  This fact limits the use of wirewounds for applications with high switching speeds, which require low inductance.  Now the same standard wirewounds can be used for these applications by using a non-inductively wound version.  This manufacturing method greatly reduces the inductance of any given resistor size and value combination, however it does not completely eliminate the inductance.  A non-inductively wound wirewound has one winding in one direction and one in the other direction; known as Ayrton Perry winding.  A byproduct of this design is that this creates two resistors in parallel in each device.  Because of this, non-inductive wirewounds have an upper resistance range limit of ½ the value possible with a standard winding.  For ease of use, Stackpole has listed a non-inductive resistance value range on their data sheets along with the standard range.

The WW and NWW series are both RoHS compliant and offer standard tape and reel packaging in 250 pcs to 2500 pcs increments depending on size.  Pricing is size and value dependent, but ranges from $.16 each to $1.06 each for minimum quantities.  Standard lead-time for this product is stock to 8 weeks.

For more information about Stackpole products, contact Utech Electronics, Inc. at 1-5250 Finch Ave. East, Scarborough ON M1S 5A4; phone 1-800-268-8832; fax 416-609-2900; email; or visit the Web site at

Stackpole Electronics Inc. is a leading global manufacturer of resistors supplying to the worlds largest OEMs, contract manufacturers and distributors. Headquartered in Raleigh, N.C., the privately held company began manufacturing in 1928 as part of Stackpole Carbon Company in St. Mary’s, Pennsylvania.  Now affiliated with Akahane Electronics, Stackpole has manufacturing facilities in Japan, Taiwan, China and Mexico; warehousing facilities in El Paso, Hong Kong and Japan; and sales offices in Tokyo, Hong Kong and Taiwan.

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