WIREWOUND RESISTORS

High Precision Wirewound Resistors

BWWPower precision wirewound resistors

Designed to meet the exacting requirements of military specification MIL-R-93, the new BWW Series moulded precision wirewound resistors from Tokenchina offer high stability and low temperature coefficient of resistance (TCR).


Offering tolerances as accurate as ±0.001 and covering applications from precision to power, the BWW Series resistors feature a wide range of tolerances (±0.001 to ±2%), low inductance, and they are RoHS compliant.


The axial configuration the BWW Series makes the resistors ideal for PCB and hard wiring applications.


Features precision wirewound resistors Power Derating Curve

  • Axial Moulded Type
  • High Reliability
  • Insulation, Moisture Proof
  • Excellent load life stability
  • Meets the Standards of MIL-R-93
  • High ohmic value precision series
  • Ideally suited for use in precision applications
  • Miniaturized better power to dimension ratios
  • PCB and hard wiring applications.

Specifications & Dimensions - Precision Wirewound BWW

Type Rated Watts
at 25°C
(W)
Resistance Range
(Ω)
Tolerance
(%)
TCR
(PPM/°C)
Dimensions (mm)
Min Max A±0.25 ΦB±0.25 Φd F
BWW-0.5 0.5 0.1 100 ±0.1
±0.25
±0.5
±1
±2
±25
±50
±150
7.0 3.0 0.8 27.0
BWW-1 1.0 0.1 1K 11.0 3.0 0.8 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

Environmental Characteristics - Precision Wirewound BWW

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

How to Order - High Precision Wirewound BWW

BWW - 1W 100R F D P
Product Type
Power Rating
Resistance
R100 0.1Ω
100R 100Ω
1KR 1000Ω
Resistance Tolerance
B ±0.1%
C ±0.25%
D ±0.5%
F ±1%
G ±2%
TCR
C ±25PPM/°C
D ±50PPM/°C
K ±150PPM/°C
Packaging
P Bulk

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BWW Series - High Precision Wirewound Resistors