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).
|Technical Specifications (KNP-R)|
|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|
|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)|
|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)
|Order Codes (KNP-R)|