Raleigh, N.C. Stackpole Electronics, Inc. has introduced a non-inductive version of its standard WW series of conformal coated, leaded wirewound resistors. The NWW series offers the expected performance of a wirewound resistor with the added characteristic of vastly improved inductance, making it suitable for high-switching applications. 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 though it is inherently inductive, said Stackpole. By using a non-inductively wound version this greatly reduces the inductance of any given resistor size and value combination; however, it does not completely eliminate the inductance, added the company.
A non-inductively wound wirewound has one winding in one direction and one in the other direction; known as Ayrton Perry winding, and a byproduct of this design is that it creates two resistors in parallel in each device. Because of this, non-inductive wirewounds have an upper resistance range limit of half the value possible with a standard winding. For ease of use, Stackpole has listed a non-inductive resistance value range on its datasheets along with the standard range.
The WW and NWW series are both RoHS compliant and offer standard tape-and-reel packaging in 250 to 2500-piece increments depending on size.
Pricing: $.16 to $1.06 each for minimum quantities, depending on size and value.
Availability: From stock to eight weeks.
Product information: wirewound resistors
Stackpole Electronics, 1-919-850-9500, www.seielect.com