Non-inductive Wirewound Resistors


Introduction (KNPN)

Wirewound Non-inductive Resistors (KNPN) Series
Non-inductive Wire Wound Resistors (KNPN)
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Non-inductive Wire Wound Resistor Improves Inductance for High Frequency Applications.

Token Electronics has introduced a non-inductive version KNPN resistor of conformal coated, leaded wirewounds. The KNPN non-inductive wire wound resistor offers the expected performance with the added characteristic of vastly improved inductance, making it suitable for high-switching applications.

Wirewound technology has long been known as a leading technology for power resistor needs though it is inherently inductive. Known as Ayrton Perry winding, a non-inductively wound has one winding in one direction and one in the other direction.

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.

This non-inductive winding is available in all standard KNPN sizes from 0.5 watts up to 6 watts with options 1%, 2% and 5% tolerance. The KNPN series is RoHS compliant and also can be supplied with radial, goalpost or lancet preformed leads.

To address your need for technical and economic success in a timely manner, our custom solutions are available. Contact us with your specific needs.

Features :

  1. Low cost
  2. Excellent pulse load capability
  3. Non-inductive Ayrton Perry winding
  4. A wide resistance range 0.1Ω to 50Ω
  5. A wide range of power ratings 0.5W to 6W
  6. Operating temperature range -55°C ~ 155°C
  7. Products with Pb-free Terminations and RoHS compliant

Applications :

  1. Power tools
  2. Current sensing
  3. Consumer applications
  4. Power supplies, Welders
  5. High voltage applications
  6. High-switching applications
  7. Home entertainment, appliances

General Specifications (KNPN)

Non-inductive Wirewound KNPN Dimensions
Non-inductive Resistor (KNPN) Dimensions
Type Rated
Dimensions (Unit: mm) Resistance
Range (Ω)
D ± 0.5 L ± 1 H ± 3 d ± 0.05
KNPN KNPN-50 1/2W 4 9.0 26 0.50~0.55 0.1-10 Ω ± 1%
± 2%
± 5%
KNPN-100 1W 4 9.0 26 0.50~0.55 0.1-10 Ω
KNPN-100B 1W 4.5 11.5 26 0.75~0.80 0.1-10 Ω
KNPN-200 2W 4.5 11.5 26 0.75~0.80 0.1-10 Ω
KNPN-200B 2W 5.5 15.5 35 0.75~0.80 0.1-20 Ω
KNPN-300 3W 5.5 15.5 35 0.75~0.80 0.1-20 Ω
KNPN-400 4W 6.5 17.5 35 0.75~0.80 0.1-30 Ω
KNPN-500 5W 6.5 17.5 35 0.75~0.80 0.1-30 Ω
KNPN-500B 5W 8.5 24.5 38 0.75~0.80 0.1-50 Ω
KNPN-600 6W 8.5 24.5 38 0.75~0.80 0.1-50 Ω

Electrical Performance (KNPN)

(KNPN) Power derating curve
(KNPN) Power derating curve
Operating Temperature Range
-55 °C ~ 275 °C (0W)
Resistance Temp. Coeff.
Room temperature/100 °C up ± 300 PPM / °C
Short Time Overload 10 times of rated wattage for 5 sec. ± 2 %
Rated Load Rated wattage 30 min. ± 1 %
Voltage Withstanding 500VAC 1 min ± 1 %
Temperature Cycling -20 °C ~ 85 °C 5 cycles ± 1 %

Application Notes of Non-inductive Wire Wounds (KNPN)

  1. When being used in AC circuits, some wirewound structures give inductance ingredients or parasitic capacity, so they may cause unusual phenomena such as oscillations etc.
    Quorum deviations of other components should be carefully taken into account for use.

  2. Application and Placement: Wire wound resistors use different gauges of wire as resistance elements.
    Sometimes the gauge is extremely thin (finer than a strand of human hair) and very susceptible to breakage in environments containing salts, ash, dust and corrosives. Avoid utilization in such environments.

  3. Do not install in dusty areas because the accumulation will cause shorts and poor conductance.

Order Codes (KNPN)

KNPN-100 1W 10R J P
Part Number
Rated Power (W)
Resistance Value (Ω)
0R1 0.1Ω
1R2 1.2Ω
10R 10Ω
12R 12Ω
Resistance Tolerance (%)
F ±1%
G ±2%
J ±5%
P Bulk
TB Taping Box