WIREWOUND RESISTORS

Power Precision Wirewound Resistors

KNP-R

Power precision wirewound resistors The new KNP-R series moulded axial leaded wirewound resistors from Tokenchina use high-purity alumina ceramic cores with wire winding by high precision machine tools to ensure total operational consistency throughout.


The resistors are also encapsulated with ceramic-silicone coating compound using advanced encapsulation mould/die technologies.


This KNP-R version has ultralow ohmic values for current sensing applications. An ultrahigh ohmic value and noninductive windings are available.


The KNP-R series is lead-free, RoHS compliant and MIL-R-26F standard.


Characteristics U: Power precision wirewound resistors Power Derating Curve

  • 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.

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

Technical Specifications & Dimensions - Precision Wirewound KNP-R

Power precision wirewound resistors 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 Characteristics - Precision Wirewound KNP-R

Test Items Test Method Specifications
Load Life +25°C, 1.5Hrs on ~ 0.5Hrs off cycle, 1000 Hrs. U: ΔR±(1%+0.05Ω)
V: ΔR±(3%+0.05Ω)
Rated Load Rated wattage 30 minutes. ΔR±(1%+0.05Ω)
Temp. Cycle -20°C ~ 85°C 5 cycles ΔR±(1%+0.05Ω)
Incombustibility 16 times of rated wattage for 5 min. Not flamed
Voltage Withstanding 500VAC 1 minute. ΔR±(1%+0.05Ω)
Insulation Resistance 500V 20MΩ
Short Time Overload 2.5 times of rated voltage 5 sec. ΔR±(2%+0.05Ω)
Soldering After Resistance 235°C for 3 sec ΔR±(0.5%+0.05Ω)

How to Order - Power Precision Wirewound KNP- R

KNP-R3A U 3R85 B P
Product Type
Characteristic
U 275°C
V 375°C
Resistance
R100 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%
Packaging
TB Taping Box
P Bulk

PDF download

KNP-R Series - Precision Wirewound Resistors