MFR-25FRF52-348R

Through-hole resistors General Type Metal Film Resistors Normal & Miniature Style [ MFR Series ] FEATURES Power Rating 1/6W, 1/4W, 1/2W, 1W, 2W, 3W Resistance Tolerance ±0.5%, ±1%, ±2%, ±5% T.C.R. ±50ppm/°C, ±100ppm/°C DERATING CURVE For resistors operated in ambient temperatures above 70°C, power rating must be derated in accordance with the curve below. INTRODUCTION The MFR Series Metal Film Resistors are manufactured using a vacuum sputtering system to deposit multiple layers of mixed metal alloys and passivative materials onto a carefully treated high grade ceramic substrate. After a helical groove has been cut in the resistive layer, tinned connecting leads of electrolytic copper are welded to the end-caps. The resistors are coated with layers of blue color lacquer. Rated Load (%) 70 155 °C 100 80 60 40 20 20 40 60 80 100 120 140 160 Ambient Temperature (°C) DIMENSIONS Unit: mm STYLE ød H L øD DIMENSION Normal Miniature L øD H ød MFR-12 MFR25S 3.4±0.3 1.9±0.2 28±2.0 0.45±0.05 MFR-25 MFR50S 6.3±0.5 2.4±0.2 28±2.0 0.55±0.05 MFR-50 MFR1WS 9.0±0.5 3.3±0.3 26±2.0 0.55±0.05 MFR100 MFR2WS 11.5±1.0 4.5±0.5 35±2.0 0.8±0.05 MFR200 MFR3WS 15.5±1.0 5.0±0.5 33±2.0 0.8±0.05 5 Note: ELECTRICAL CHARACTERISTICS STYLE MFR-12 MFR25S Power Rating at 70°C 1/6W 1/4W Maximum Working Voltage 200V 250V 300V 350V 400V 500V Maximum Overload Voltage 400V 500V 600V 700V 800V 1,000V Voltage Proof on Insulation 300V 700V 1,000V Resistance Range 1Ω - 4M7Ω & for E24 & E96 series value Operating Temp. Range -55°C to +155°C Temperature Coefficient ±50ppm/°C, ±100ppm/°C 400V MFR-25 MFR50S MFR-50 1/2W MFR1WS MFR100 1W 500V MFR2WS MFR200 MFR3WS 2W 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. (Not more than maximum Overload Voltage) ±0.25%+0.05Ω Voltage Proof on Insulation IEC 60115-1 4.7 In V-Block for 60 sec., test voltage as above table No Breakdown Temperature Coefficient IEC 60115-1 4.8 Between -55°C to +155°C By type Insulation Resistance IEC 60115-1 4.6 in V-block for 60 Sec. >10,000MΩ Solderability IEC 60115-1 4.17 245±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 ±1.5%+0.05Ω Endurance at 70°C IEC 60115-1 4.25 70±2°C at RCWV (or Umax., Whichever less) for 1,000 Hr. (1.5Hr.on, 0.5Hr. Off) ±1.5%+0.05Ω Temperature Cycling IEC 60115-1 4.19 -55°C  Room Temp.  +155°C  Room Temp. (5 cycles) ±0.75%+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 ±0.25%+0.05Ω Note: RCWV(Rated Continuous Working Voltage) = Power Rating x Resistance Value or Max. working voltage listed above, whichever less. Revision: 2020