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 <1μH. For resistors operated in ambient temperatures above 70°C, power rating must be derated in accordance with the curve below. 70 Rated Load (%) 155 °C 100 80 60 40 The resistors are coated with layers of gray color lacquer for normal size & pink color lacquer for miniature size. 20 20 40 60 80 Ambient Temperature (°C) 100 120 140 160 TABLE 1 TEMPERATURE COEFFICIENT Value Range Temp. Coefficient (ppm/°C) Under 5KΩ -500~0 5K - 10KΩ -800~0 DIMENSIONS Unit: mm STYLE ød H L 5th color code: green øD DIMENSION Normal Miniature L øD H ød NCR-25 NCR50S 6.3±0.5 2.4±0.2 28±2.0 0.55±0.05 NCR-50 NCR1WS 9.0±0.5 3.3±0.3 26±2.0 0.55±0.05 NCR100 NCR2WS 11.5±1.0 4.5±0.5 35±2.0 0.8±0.05 NCR200 NCR3WS 15.5±1.0 5.0±0.5 33±2.0 0.8±0.05 35 Note: ELECTRICAL CHARACTERISTICS STYLE NCR-25 NCR50S Power Rating at 70°C 1/4W 1/2W Maximum Working Voltage PxR Voltage Proof on Insulation 500V Resistance Range 2.2Ω - 10KΩ for E24 series value Operating Temp. Range -55°C to +155°C Temperature Coefficient see Table 1 NCR-50 NCR1WS NCR100 1W NCR2WS NCR200 2W NCR3WS 3W Note: Special value is available on request ENVIRONMENTAL CHARACTERISTICS PERFORMANCE TEST TEST METHOD APPRAISE Short Time Overload IEC 60115-1 4.13 2.5 times RCWV for 5 Sec. ±0.75%+0.05Ω for normal style ±2.0%+0.05Ω for miniature style Voltage Proof on Insulation IEC 60115-1 4.7 in V-block for 60 Sec., test voltage by type By type Temperature Coefficient IEC 60115-1 4.8 -55°C to +155°C By type Insulation Resistance IEC 60115-1 4.6 in V-block for 60 Sec. >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