NCR-25KR-52-390R

Through-hole resistors Non-Inductive & Flame-Proof Type Carbon Film Resistors Normal & Miniature Style [ NCR Series ] FEATURES Power Rating 1/4W, 1/2W, 1W, 2W, 3W Resistance Tolerance ±5%, ±10% T.C.R. see Table 1 Flameproof Multi-layer Coating Meets UL-94V-0 Flameproof Feature Meets Overload Test UL-1412 INTRODUCTION DERATING CURVE The NCR Series Carbon Film Non-Inductive & Flame-Proof Resistors are manufactured by coating a homogeneous film of pure carbon on high grade ceramic rods. Tinned connecting leads of electrolytic copper are welded to the end-caps. The inductance is 1,000MΩ Solderability IEC 60115-1 4.17 235±5°C for 3±0.5 Sec. 95% Min. coverage Solvent Resistance of Marking IEC 60115-1 4.30 IPA for 5±0.5 Min. with ultrasonic No deterioration of coatings and markings Robustness of Terminations IEC 60115-1 4.16 Direct load for 10 Sec. in the direction of the terminal leads ≥2.5kg (24.5N) Periodic-pulse Overload IEC 60115-1 4.39 4 times RCWV 10,000 cycles (1 Sec. on, 25 Sec. off) ±1.0%+0.05Ω Damp Heat Steady State IEC 60115-1 4.24 40±2°C, 90-95% RH for 56 days, loaded with 0.1 times RCWV ±3.0%+0.05Ω Endurance at 70°C IEC 60115-1 4.25 70±2°C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off) ±3.0%+0.05Ω Temperature Cycling IEC 60115-1 4.19 -55°C  Room Temp.  +155°C  Room Temp. (5 cycles) ±1.0%+0.05Ω Resistance to Soldering Heat IEC 60115-1 4.18 260±3°C for 10±1 Sec., immersed to a point 3±0.5mm from the body ±1.0%+0.05Ω Accidental Overload Test IEC 60115-1 4.26 4 times RCWV for 1 Min. No evidence of flaming or arcing Note: RCWV(Rated Continuous Working Voltage) = Power Rating x Resistance Value or Max. working voltage listed above, whichever less. Revision: 201304