MMF-25FRE1K33

Through-hole resistors Melf Metal Film Resistors General Type Normal & Miniature Style [ MMF Series ] FEATURES Power Rating 1/6W, 1/4W, 0.4W, 1/2W, 0.6W, 1W Resistance Tolerance ±0.1%, ±0.25%, ±0.5%, ±1%, ±2%, ±5% T.C.R. ±15ppm/°C, ±25ppm/°C, ±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 MMF Series Melf 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. SMD enabled structure. Rated Load (%) 70 155 °C 100 80 60 40 20 20 40 60 80 Ambient Temperature (°C) 100 120 140 160 DIMENSIONS Unit: mm STYLE D C L DIMENSION Normal Miniature L D C Min. MMF-12 MMF25S / MMF204 3.50±0.2 1.40±0.15 0.5 MMF-25 MMF50S / MMF207 5.90±0.2 2.20±0.1 0.5 MMF-50 MMF1WS 8.50±0.2 3.20±0.2 0.5 21 Note: ELECTRICAL CHARACTERISTICS STYLE MMF-12 MMF25S MMF204 MMF-25 MMF50S MMF207 MMF-50 MMF1WS Power Rating at 70°C 1/6W 1/4W 0.4W 1/4W 1/2W 0.6W 1/2W 1W Maximum Working Voltage 150V 200V 250V 350V Maximum Overload Voltage 300V 400V 500V 700V Voltage Proof on Insulation 300V 500V 700V Resistance Range 0.22Ω-3.9Ω for tol ±5%, E96 series value, 4Ω - 1MΩ for tol ±1% E24 + E96 series value Operating Temp. Range -55°C to +155°C Temperature Coefficient ±50ppm/°C for 4Ω - 1MΩ , ±100ppm/°C for 0.22Ω - 3.9Ω 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) ±0.5%+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 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 ±2.0%+0.1Ω 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) ±2.0%+0.1Ω 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 ±0.5%+0.05Ω Note: RCWV(Rated Continuous Working Voltage) = Power Rating x Resistance Value or Max. working voltage listed above, whichever less. Revision: 2020