() Product Name Metal Film Fixed Resistor 2017 06 10 B/3 13-1 Version Enactment Date JUN 30, 2017 Page 1. General 1.1 Scope RoHS This specification is available for Metal Film Fixed Resistor,it accords with RoHS test of Environment related substance requirement 1.2 () Type designation (example) , The type designation shall be in the following form and as specified. MF 2 W 1E F T73 Form Type Rated power Nominal resistance Resistance P P Type value tolerance M M Type Normal Small 5% J E-24 Series MB MB Type 1/8W 1/4WS 2% G FK1 FK1Type 1/4W 1/2WS F 1% E-96 Series FK2 FK2 Type 1/2W 1WS D 0.5% FKK FKK Type 1W 2WS 2W 3WS 3W 5WS 5W 1.3 Rated power 70, -1 70 Rated power is maximum power which can be continuously loaded at specified ambient temperature 70,as Table-1 however when the ambient temperature exceeds 70,rated power should be determined from the derating curve of Fig.1. (%) () Product Name Metal Film Fixed Resistor 2017 06 10 B/3 13-2 Version Enactment Date JUN 30, 2017 Page -1 Table-1 () Type Rated power Maximum working Maximum overload Resistance voltage voltage Range() MF1/8W 0.125W 150V 300V 1~1M MF1/4W 250V 500V 1~10M 0.25W MF1/2W 0.5W 300V 700V 1~10M MF1W 1W 350V 800V 1~10M MF2W 2W 500V 800V 1~10M MF3W 3W 500V 800V 1~10M MF5W 5W 500V 1000V 1~10M MF1/4WS 0.25W 150V 300V 1~10M MF1/2WS 0.5W 250V 700V 1~10M MF1WS 1W 300V 800V 1~10M MF2WS 2W 350V 800V 1~10M MF3WS 3W 500V 1000V 1~10M MF5WS 5W 500V 1000V 1~10M Figure 1 Power derating curve 120 -55 70 100 80 60 40 20 0 -60 -40 -20 0 20 40 60 80 100 120 140 160 180 200 220 240 260 Ambient Temperature() 155 1.4 Rated voltage (), The rated voltage shall be the D.C. or A.C.(R.M.S. at power frequency) voltage which corresponds the rated power and the value of which is calculated from the formula below. Small size Normal size Rated load(%)