Precision Power Wirewound Resistors (KNP-R)

Wire Wound Resistors (KNP-R)

Power Wire Wound Resistors Boast Consistent Precision Power Operation.

Direct’s highest quality conformal axial terminal ceramic-silicone coated KNP-R power resistors for applications requiring high stability and precision. The KNP-R wire-wound has a low temperature coefficient and maintain a high degree of stability under demanding conditions.

The power precision KNP-R series meeting MIL-R-26E (U and V characteristics) and surface temperature (hot spot) 375°C max. Resistors with a wide range of 0.01Ω ~ 82kΩ, covering applications from precision to power. Products with lead-free terminations meet EU RoHS and China RoHS requirements.

Characteristics U :
275°C Maximum hot spot temperature. 1% Maximum ΔR in 1000 hours load life.

Characteristics V :
375°C Maximum hot spot temperature. 3% Maximum ΔR in 1000 hours load life.

Operating temperature range is -55°C ~ +375°C and derated power at high ambient temperatures as according to the chart below. Direct is equipped to design and produce custom components to meet many design and reliability demands. In addition to standard military-grade resistor products, we also have many resistive products designed to meet various source-controlled drawings.

Contact us with your specific needs.

Download complete PDF Wire Wound Resistors (KNP-R).

Features :
  1. Excellent load life stability
  2. High Precision and reliability
  3. Axial ceramic-silicone coated
  4. Meets the Standards of MIL-R-26E
  5. RoHS compliant with 100% lead free
Applications :
  1. Radar, Ground Vehicles
  2. Communications systems
  3. Bias supply, Current shunts, Voltage dropping
  4. Motor speed controls, Voltage divider networks
  5. Medical instrumentation and Medical implantables
Technical Specifications (KNP-R)
Precision Power Wirewound Resistors (KNP-R) Power Derating Curve Precision Power Wirewound Resistors (KNP-R) Dimensions
Type MIL - R-26E Power Rating (W) Max. Working Voltage (V) Resistance Range (Ω) Dimensions (Unit: mm)
U V U V 0.1% 0.25% 0.5% 1% 2% 3% 5% L ± 0.81 D ± 0.81 d ± 0.1
KNP-R1/4 - 0.40 - 20 - 10~950 1~3.4K 6.35 1.98 0.51
KNP-R1/2 RW70 0.75 - 29 - 10~1.3K 1~4.9K 7.92 1.98 0.51
KNP-R1A - 1.00 - 53 - 1~2.7K 0.1~10.4K 10.31 2.36 0.64
KNP-R1 RW69 1.10 - 62 - 1~4.0K 0.1~15K 13.49 2.36 0.64
KNP-R2A - 2.50 3.25 138 157 1~8.6K 0.01~32.3K 12.70 5.33 0.81
KNP-R2 RW79 3.00 3.75 135 148 1~5K 0.01~2K 13.49 4.06 0.81
KNP-R3A - 3.00 3.75 135 148 1~6.5K 0.01~34.5K 14.27 5.33 0.81
KNP-R3 - 3.25 4.75 185 220 1~11.4K 0.01~42.1K 20.62 5.33 1.02
KNP-R4 RW67 4.00 5.50 210 250 1~12.7K 0.01~47.1K 15.88 7.62 1.02
KNP-R5 RW74 5.00 6.50 330 376 0.5~24.5K 0.01~51K 22.22 7.62 1.02
KNP-R7 RW68 7.00 9.00 504 576 0.5~41.4K 0.01~75K 30.94 9.52 1.02
KNP-R10 RW78 10.00 13.00 799 911 0.5~71.3K 0.01~82K 45.21 9.52 1.02
Temperature Coefficient: 1 Ω and below ± 150 ppm/°C, 1 Ω to 9.9 Ω ± 100 ppm/°C, 10 Ω and above ± 100 ppm/°C, (50 ppm/°C on request)
Electrical Performance (KNP-R)
Test Items Test Method Specifications
Short Time Overload 2.5 times of rated voltage 5 sec. ΔR±(2%+0.05Ω)
Rated Load Rated wattage 30 minutes. ΔR±(1%+0.05Ω)
Voltage Withstanding 500VAC 1 minute. ΔR±(1%+0.05Ω)
Insulation Resistance 500V 20MΩ
Temp. Cycle -20°C ~ 85°C 5 cycles ΔR±(1%+0.05Ω)
Soldering After Resistance 235°C for 3 sec ΔR±(0.5%+0.05Ω)
Incombustibility 16 times of rated wattage for 5 min. Not flamed
Load Life +25°C, 1.5Hrs on ~ 0.5Hrs off cycle, 1000 Hrs. U: ΔR±(1%+0.05Ω)
V: ΔR±(3%+0.05Ω)
Order Codes (KNP-R)
KNP-R3A U 100R B P
Type
KNP-R3A
Characteristic (°C)
U 275°C
V 375°C
Resistance Value
(Ω)
0R1 0.1Ω
1R
100R 100Ω
1K 1000Ω
Resistance Tolerance
(%)
B ±0.1%
C ±0.25%
D ±0.5%
F ±1%
G ±2%
H ±3%
J ±5%
Package
P Bulk
TB Taping Box