A precision wirewound resistor is designed to absorb high energy impulses. Stable materials used in the wiring of a wirewound resistor leads to high accuracy, superior stability, and low temperature coefficient of resistance (TCR).
Johanson Dielectrics precision wirewound resistors (RWP series) are designed to meet the demanding requirements for high energy impulses. Our wirewound resistors achieve tight tolerances starting at ±0.005%, and are available as radial and axial resistors for thru-hole mounting or soldering of wires on the leads.
We design your radial and axial resistors to address the majority of industry standard impulse requirements through mass and wire geometry (length and diameter) design.
Contact us for your unique impulse requirements. Our applications engineers will assist in finding the right wirewound resistor for your application.

Wire wound resistor, Wirewound resistor, Axial resistors, Low temperature coefficient of resistance, Low tcr resistor, Ultra high precision resistor
KEY FEATURES:
  • Low TCR ±2ppm/°C
  • Temperature Coefficients of ± 2ppm/°C
  • Temperature Range -55°C to +145°C
  • Resistance to 6 Mega-Ohms
  • Resistance Tolerance starting at ± 0.005%
  • Long Term Stability / 100ppm/year
  • High TCR Available - Platinum & Balco Wire
  • Matched Resistance Sets to ± 0.001 and
    ± 0.5 ppm/°C
  • 100% Acceptance Tested
  • RoHS Compliant
  • Options available: Wide TCR Range,
    High Stability and Fast Rise Time
APPLICATIONS
  • Smart Grid Metering
  • Power Inverters
  • Engine Sensors
  • Temperature Sensors
PRODUCT SERIES (RWP) RESISTANCE(Ω) POWER RATING(W) TOLERANCE 1 TEMPERATURE COEFFICIENT TEMPERATURE RANGE 1
Radial Up to 1M 0.125 to 0.500
± 0.005% to 1%
  • >100 Ω : ± 10ppm/°C
  • 10 Ω to 100 Ω : ± 20ppm/°C
  • <10 Ω : ± 30ppm/°C
- 55°C to + 145°C
Axial Up to 6M 0.06 to 2.00

1 See Power Derating Curve

Power Derating Curve
Radial
Package Code B01 B02 B03 B04
Max Resistance (Ω) 500k 750k 500k 1M
Max Working Voltage (V) 150 150 150 150
Power Rating (W) 0.125 0.250 0.300 0.500
Dimensions
Inches [mm]
Width
±0.010”
[±0.25mm]
0.140
[3.56]
0.150
[3.81]
0.102
[2.59]
0.160
[4.06]
Height
±0.025”
[±0.64mm]
0.250
[6.35]
0.270
[6.86]
0.320
[8.13]
0.525
[13.34]
Length
±0.010”
[±0.25mm]
0.270
[6.86]
0.540
[13.72]
0.300
[7.62]
0.585
[14.86]
Lead Diameter 1
±0.002”
[±0.05mm]
0.032
[0.81]
0.032
[0.81]
0.025
[0.64]
0.032
[0.81]
Lead Spacing
±0.015”
[±0.4mm]
0.125
[3.18]
0.250
[6.35]
0.150
[3.81]
0.400
[10.16]

* Moisture Sensitivity Level: MSL - 1

Radial Dimensions
Radial Dimensions diagram
1 Lead Length 1.00” [25.40mm] Min

Axial Dimensions
Axial Dimensions diagram
2 Lead Length 1.50” [38.10mm] Min
Axial
Package Code A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12
Max Resistance (Ω) 75k 150k 150k 250k 250k 400k 500k 500k 750k 750k 1M 1M
Max Working Voltage (V) 75 100 100 100 100 150 150 100 200 200 200 200
Power Rating (W) 0.06 0.08 0.08 0.10 0.10 0.12 0.15 0.15 0.175 0.20 0.20 0.20
Dimensions Inches [mm]
Length
±0.010”
[±0.25mm]
0.210
[5.33]
0.260
[6.60]
0.260
[6.60]
0.375
[9.53]
0.312
[7.92]
0.250
[6.35]
0.295
[7.49]
0.250
[6.35]
0.375
[9.53]
0.450
[11.43]
0.375
[9.53]
0.375
[9.53]
Diameter
±0.002”
[±0.05mm]
0.100
[2.54]
0.125
[3.18]
0.125
[3.18]
0.125
[3.18]
0.156
[3.96]
0.187
[4.75]
0.187
[4.75]
0.250
[6.35]
0.187
[4.75]
0.187
[4.75]
0.250
[6.35]
0.250
6.35]
Lead Spacing
±0.015”
[±0.4mm]
0.020
[0.51]
0.020
[0.51]
0.025
[0.64]
0.020
[0.51]
0.020
[0.51]
0.025
[0.64]
0.025
[0.64]
0.025
[0.64]
0.025
[0.64]
0.025
[0.64]
0.032
[0.81]
0.025
[0.64]

 

Package Code A13 A14 A15 A16 A17 A18 A19 A20 A21 A22 A23
Max Resistance (Ω) 1M 1.2M 1.2M 2.5M 2.5M 3.8M 3.8M 6M 6M 6M 6M
Max Working Voltage (V) 250 300 300 400 400 300 400 600 800 900 1000
Power Rating (W) 0.25 0.25 0.25 0.33 0.33 0.40 0.50 0.75 1.00 1.50 2.00
Dimensions Inches [mm]
Length
±0.010”
[±0.25mm]
0.465
[11.81]
0.500
[12.70]
0.500
[12.70]
0.750
[19.05]
0.750
[19.05]
0.500
[12.70]
0.750
[19.05]
1.000
[25.40]
1.000
[25.40]
1.500
[38.10]
2.000
[50.80]
Diameter
±0.002”
[±0.05mm]
0.210
[5.33]
0.250
[6.35]
0.250
[6.35]
0.250
[6.35]
0.250
[6.35]
0.375
[9.53]
0.375
[9.53]
0.375
[9.53]
0.500
[12.70]
0.500
[12.70]
0.500
[12.70]
Lead Spacing
±0.015”
[±0.4mm]
0.025
[0.64]
0.032
[0.81]
0.025
[0.64]
0.032
[0.81]
0.025
[0.64]
0.032
[0.81]
0.032
[0.81]
0.032
[0.81]
0.032
[0.81]
0.032
[0.81]
0.032
[0.81]

* Moisture Sensitivity Level: MSL - 1

Available Options (Consult Factory)
  • Wide TCR Range: Low and High TC configurations from -20ppm/ºC to +6000ppm/ºC. Down to 1ppm/ºC available.
  • High Stability: High stability version with maximum resistance change of ± 20ppm/year under normal conditions.
  • Fast Rise Time: Low reactance design for fast rise time and extended frequency response.
  • Special Testing Requirements
  • Special Pulse Requirements
How to Order RWP Series Part Number Breakdown

This datasheet is subject to change without notice.