Power Low-Inductance Low-Resistance Resistors (BWL)

Low-Inductance Resistor (BWL) Introduction

Token's (BWL) Power Low-Resistance Resistor minimise power consumption.

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  • Power Low-Inductance Low-Resistance Resistor (BWL)

In response to demand for more energy efficient products, Token Electronics has expanded its current sensing series offering with the launch of the BWL series, its lowest resistance value resistor, to minimise power consumption.

The BWL series has been designed for current sensing in power electronic systems and the resistors are available in 0.5W to 10W power ratings, with a wide ohmic range starting from as low as 0.005Ω.

Products in the economical, low-inductance BWL resistors are axial leads with high temperature mold compound, making them well-suited to the industry trend and are ideal for all types of current sensing applications including switching and linear power supplies, instruments and power amplifiers

In addition, the BWL series utilizes metal strip technology, essential for those involved in constructing devices and circuits for the detection of currents.

Token's BWL standard series is lead-free and RoHS compliant and can be a replacement for Vishay, IRC, KOA, Panasonic current sense resistor with more competitive price and short lead time. Contact us with your specific needs.

Download PDF Specification Power Low Resistance Resistor.

Features :
  • Low temperature coefficient. Excellent load life stability.
  • Low inductance. Cooler operation for high power to size ratio.
  • Proprietary processing technique produces extremely low resistance values.
Material :
  • BWL metal strip technology utilizes manganin.
  • Encapsulation: High temperature mold compound.
  • Element: Self-supporting nickel-chrome alloy. Terminals: Tinned copper.
Applications :
  • Instruments, Switching and linear power supplies, Power amplifiers, Notebook power management.

Technical Specifications & Dimensions (BWL)

(BWL) Power Derating Curve
(BWL) Power Derating Curve
Low Resistance Resistor (BWL) Dimensions
Low Resistance Resistor (BWL) Dimensions
Type Rated Watts
at 25°C (W)
Resistance Range (Ω) Tolerance Dimensions (Unit: mm)
Min Max A±0.25 ΦB±0.25 Φd F
BWL-0.5 0.5 0.01 1 ±1%
7.0 3.0 0.6 27.0
BWL-1 1.0 0.005 2 11.0 3.0 0.6 31.0
BWL-3 3.0 0.005 2 15.0 5.2 0.8 35.0
BWL-4 4.0 0.005 5 18.0 6.5 0.8 38.0
BWL-5 5.0 0.005 1 24.0 8.4 1.0 44.0
BWL-10 10.0 0.01 1 46.5 10.0 1.0 66.0

Electrical Performance (BWL)

Test Items Test Conditions Specifications
Operating Temp. Range   -55°C ~ 175°C
Insulation Resistance 500V >1GΩ
Dielectric Withstanding Voltage 500V AC 1 Min. ΔR ≤ ±0.1%R
Load Life 70°C on~off cycle 1000 Hrs. ΔR ≤ ±1%R
Moisture-Proof Load Life 40°C 95% RH on~off cycle 21 Hrs. ΔR ≤ ±0.2%R
Resistance to soldering heat 350°C, 3.5s ΔR ≤ ±0.1%R
Solderability 235±5°C, 5s(solder bath method) IEC68-2-20(1968)

Order Codes (BWL)

BWL - 1W R01 F P
Part Number
Power Rating (W)
0.5W 0.5
1W 1.0
3W 3.0
4W 4.0
5W 5.0
10W 10.0
Resistance (Ω)
R01 0.01Ω
0R1 0.1Ω
Resistance Tolerance (%)
F ±1%
G ±2%
J ±5%
P Bulk