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 iNTroDuCTioN in accordance with the curve below. The MFR Series Metal Film Resistors are Rated Load (%) 70 155°C 100 manufactured using a vacuum sputtering system to deposit multiple layers of mixed metal 80 alloys and passivative materials onto a carefully 60 treated high grade ceramic substrate. After a 40 helical groove has been cut in the resistive layer, 20 tinned connecting leads of electrolytic copper are welded to the end-caps. The resistors are 20 40 60 80 100 120 140 160 Ambient Temperature (°C) coated with layers of blue color lacquer. DiMeNsioNs Unit: mm sTYle 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 ød MFR-25 MFR50S 6.3±0.5 2.4±0.2 28±2.0 0.55±0.05 H L øD 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 MFr-25 MFr50s MFr-50 MFr1Ws MFr100 MFr2Ws MFr200 MFr3Ws Power Rating at 70°C 1/6W 1/4W 1/2W 1W 2W 3W Maximum Working Voltage 200V 250V 300V 350V 400V 500V Maximum Overload Voltage 400V 500V 600V 700V 800V 1,000V Voltage Proof on Insulation 300V 400V 500V 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 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 No deterioration of Solvent Resistance of Marking IEC 60115-1 4.30 IPA for 5±0.5 Min. with ultrasonic 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