Through-hole resisT ors g eneral Type Metal Film r esistors Normal & Miniature style MFr s eries 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 Cur Ve For resistors operated in ambient temperatures above 70C, power rating must be derated iNTroDuCTioN in accordance with the curve below. The MFR Series Metal Film Resistors are 70 155 C Rated Load (%) 100 manufactured using a vacuum sputtering system 80 to deposit multiple layers of mixed metal 60 alloys and passivative materials onto a carefully treated high grade ceramic substrate. After a 40 helical groove has been cut in the resistive layer, 20 tinned connecting leads of electrolytic copper 20 40 60 80 100 120 140 160 Ambient Temperature (C) are welded to the end-caps. The resistors are coated with layers of blue color lacquer. DiMeNsioNs Unit: mm sTYle DiMeNsioN Normal Miniature l D h d MFR-12 MFR25S 3.40.3 1.90.2 282.0 0.450.05 d MFR-25 MFR50S 6.30.5 2.40.2 282.0 0.550.05 H L D MFR-50 MFR1WS 9.00.5 3.30.3 262.0 0.550.05 MFR100 MFR2WS 11.51.0 4.50.5 352.0 0.80.05 MFR200 MFR3WS 15.51.0 5.00.5 332.0 0.80.055 Note: eleCTriCAl ChArACTerisTiCs sTYle MFr -12 MFr 25s MFr -25 MFr50 s MFr -50 MFr1W s MFr100 MFr 2Ws MFr 200 MFr 3Ws Power Rating at 70C 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 1 - 4M7 & for E24 & E96 series value Operating Temp. Range -55C to +155C Temperature Coefficient 50ppm/C, 100ppm/C Note: Special value is available on request eNViroNMeNTAl ChArACTerisTiCs Per For MANCe TesT TesT MeTho D APPr Aise Shor t Time Overload IEC 60115-1 4.13 2.5 times RCWV for 5 sec. (Not more than maximum Overload Voltage) 0.25%+0.05 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 -55C to +155C By type Insulation Resistance IEC 60115-1 4.6 in V-block for 60 Sec. >10,000M Solderability IEC 60115-1 4.17 2455C for 30.5 Sec. 95% Min. coverage No deterioration of Solvent Resistance of Marking IEC 60115-1 4.30 IPA for 50.5 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%+0.05 Damp Heat Steady State IEC 60115-1 4.24 402C, 90-95% RH for 56 days, loaded with 0.1 times RCWV 1.5%+0.05 Endurance at 70C IEC 60115-1 4.25 702C at RCWV (or Umax., Whichever less) for 1,000 Hr. (1.5Hr.on, 0.5Hr. Off) 1.5%+0.05 Temperature Cycling IEC 60115-1 4.19 -55C Room Temp. +155C Room Temp. (5 cycles) 0.75%+0.05 Resistance to Soldering Heat IEC 60115-1 4.18 2603C for 101 Sec., immersed to a point 30.5mm from the body 0.25%+0.05 Note: RCWV(Rated Continuous Working Voltage) = Power Rating x Resistance Value or Max. working voltage listed above, whichever less. Revision: 2020
