Fast Fusible Metal Film Resistors WFF Series Welwyn Components • • • Low power fusing Predictable fusing characteristics Flameproof protection com Electrical Data WFF1/4 Power rating at 70˚ C Resistance range Limiting element voltage TCR Resistance tolerance Standard values Thermal impedance Ambient temperature range ˚ C/watt ˚C 150 watts ohms volts ppm/˚ C % 0.
25 0R1 - 10K 250 WFF1/2 0.
5 0R10 - 27K 350 250 5 E24 preferred 120 -55 to 155 100 WFF1 1 0R2 - 1K5 350 Physical Data Dimensions (mm) & Weight (g) Type L max 6.
2 9.
0 12.
5 D max 2.
3 2.
5 3.
4 4.
2 f min 21.
0 19.
6 17.
8 d nom 0.
6 0.
8 0.
8 PCB mounting centres 10.
2 12.
7 18.
4 Min.
bend radius 0.
6 1.
2 1.
2 Wt.
nom 0.
3 0.
6 0.
...

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