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Power Rating 1/6W, 1/4W, 1/2W, 1W, 2W, 3W Resistance T olerance ±0.5%, ±1%, ±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. Rated Load (%) Ambient Temperature (°C)160140120100806040 100 70 155 °C DiMeNsioNs Unit: mm sTYle DiMeNsioN Normal Miniature l øD h ød 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. Metal Film Resistors General Type Normal & Miniature Style [ MFR Series ] ød H L øD
Note: RCWV(Rated Continuous Working Voltage) = Power Rating x Resistance Value or Max. working voltage listed above, whichever less. Revision: 201304 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 - 10MΩ & 0Ω for E24 & E96 series value Operating Temp. Range -55°C to +155°C Temperature Coefficient ±15ppm/°C, ±25ppm/°C, ±50ppm/°C, ±100ppm/°C Note: Special value is available on request eNViroNMeNTAl ChArACTerisTiCs PerForMANCe TesT TesT MeThoD APPrAise 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. >10,000MΩ 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) 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