Moulded Axial Leaded High Precision Wirewound Resistors (BWW)

(BWW) High Precision Wirewound Resistors - Introduction

Precision Power Resistor (BWW) Operates in Harsh Environments

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  • Precision Axial Moulded Wirewound Power Resistors - BWW Series

The new BWW series moulded axial leaded wirewound resistors from Token use high-purity alumina ceramic cores with wire winding which are spot welded by precision CNC machine tools to ensure total operational consistency throughout.

Also, using advanced encapsulation die/mould technologies, this precision power resistors are encapsulated with epoxy molding compound.

The BWW models possess a wide resistance value from 0.1Ω to 39KΩ and meets the stringent requirements of MIL-R-93. Ayrton Perry noninductive windings are available on request. The BWW precision version has low ohmic values for current sensing applications.

All versions are miniaturised for better power to dimension ratios and are available in 0.5W to 10W rated power at 25°C. Tolerance is available in ±0.1%, ±0.25%, ±0.5%, ±1% and ±2% with TCR ±25PPM/°C, ±50PPM/°C and ±150PPM/°C which makes them ideally suited for use in precision applications.

The BWW series is RoHS compliant with 100% Sn (lead free) coated terminals. To address your need for technical and economic success in a timely manner, our custom solutions are the best option. Contact us with your specific needs.

Download complete PDF High Precision Wirewound Resistors (BWW).

Features :
  • Insulation, Moisture Proof.
  • High Precision and reliability.
  • Axial Moulded, Excellent load life stability.
  • Meets the Standards of MIL-R-93, RoHS compliant with 100% lead free.
Applications :
  • Electrical loads, Filament dropping, DC/DC converters, AC/DC inverters,
  • Motor speed controls, Bias supply, Current shunts, Voltage dropping, Crow-bar circuits.
  • Voltage divider networks, High-voltage bleeders, Dynamic braking, Capacitor charging/discharging regulation,

(BWW) Technical Specifications & Dimensions

(BWW) Power Derating Curve
Wirewound High Precision Resistors
(BWW) Power Derating Curve
High Precision Wirewound Resistors (BWW) Dimensions
High Precision Wirewound Resistors
(BWW) Moulded Axial Leaded Dimensions
Type Rated Watts
at 25°C
Resistance Range
Dimensions (Unit: mm)
Min Max A±0.25 ΦB±0.25 Φd F
BWW-0.5 0.5 0.1 100 ±0.1
7.0 3.0 0.6 27.0
BWW-1 1.0 0.1 1K 11.0 3.0 0.6 31.0
BWW-3 3.0 0.1 10K 15.0 5.2 0.8 34.0
BWW-4 4.0 0.1 15K 18.0 6.5 0.8 38.0
BWW-5 5.0 1 24K 24.0 8.4 1.0 44.0
BWW-10 10.0 1 39K 46.5 10.0 1.0 66.0

(BWW) Electrical Performance

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)

Application Notes of Precision Wire Wounds (BWW)

  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.

(BWW) Order Codes

BWW - 5 100R F D P
Part Number
Rated Power (W)
0.5 1/2W
1 1W
3 3W
4 4W
5 5W
10 10W
Resistance Value (Ω)
0R1 0.1Ω
100R 100Ω
1K 1000Ω
Resistance Tolerance (%)
B ±0.1%
C ±0.25%
D ±0.5%
F ±1%
G ±2%
C ±25PPM/°C
D ±50PPM/°C
K ±150PPM/°C
P Bulk