Precision power wirewound resistors 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. Direct provides wirewound resistors (KNP-R).

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.

Direct KNP-R series have an operating temperature range of -55°C ~ +375°C, They must be derated at high ambient temperatures according to the chart below.

Precision Power Wirewound Resistors (KNP-R)

Technical Specifcations
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 (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: 1Ω and below ±150 ppm/°C, 1Ω to 9.9Ω ±100 ppm/°C, 10Ω and above ±100 ppm/°C,
(50 ppm/°C on request)

Electrical Performance
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)

How to Order
KNP-R3A U 100R B P
Part Number
KNP-R
Characteristic
(°C)
U 275°C
V 375°C
Resistance
(Ω)
0R1 0.1Ω
1R
100R 100Ω
1KR 1000Ω
Resistance Tolerance
B ±0.1%
C ±0.25%
D ±0.5%
F ±1%
G ±2%
H ±3%
J ±5%
Package
TB Taping Box
P Bulk


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