l eaded r es isto r s f eat ur es power rating 1/4w, 1/2w, 1w, 2w, 3w resistance tolerance 1% t.c.r. 50ppm/c, 100ppm/c flameproof multi-layer coating meets ul-94v-0 flameproof feature meets overload test ul-1412 de r ati ng curv e for resistors operated in ambient temperatures above 70c, power rating must be derated in accordance with the curve below. metal film resistors flame-proo f type type type normal & miniature style [ fmf series ] i n t r od uc tio n the fmf series flame proof resistors are manufactured using vacuum sputtering system to deposit multiple layers of mixed metals alloy 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 gray color lacquer. ?d h l ?d di m e n sio n s unit: mm st yl e di m e n sio n normal miniature l ? d h ?d fmf-25 fmf50s 6.30.5 2.40.2 282.0 0.550.05 fmf-50 fmf1ws 9.00.5 3.30.3 262.0 0.550.05 fmf100 fmf2ws 11.51.0 4.50.5 352.0 0.80.05 fmf200 fmf3ws 15.51.0 5.00.5 332.0 0.80.05 rated load (%) ambient temperature (c) 160 140 120 100 80 60 40 100 80 60 40 20 20 70 155 c
note: 13 note: rated continuous working voltage (rcwv) = power rating x resistance value e l e c t r i c a l ch a r a c te r isti c s st yl e fmf-25 fmf50 s fmf-50 fmf1w s fmf100 fmf2w s fmf200 fmf3w s power rating at 70c 1/4w 1/2w 1w 2w 3w maximum working voltage 250v 300v 350v 400v 500v maximum overload voltage 500v 600v 700v 800v 1,000v dielectric withstanding voltage 400v 500v 600v 750v resistance range 1 - 10m & 0 for e24 & e96 series value operating temp. range -55c to +155c temperature coeffcient 50ppm/c, 100ppm/c note: special value is available on request e nv i r o nm e n ta l ch a r a c te r isti c s p e rf o rm a nc e test test m et h od a ppr aise short time overload jis-c-5202 5.5 2.5 times rcwv for 5 sec. 0.25%+0.05 dielectric withstanding voltage jis-c-5202 5.7 in v-block for 60 sec. by type temperature coeffcient jis-c-5202 5.2 -55c to +155c by type insulation resistance jis-c-5202 5.6 in v-block >1,000m solderability jis-c-5202 6.5 2605c for 50.5 sec. 95% min. coverage resistance to solvent jis-c-5202 6.9 ipa for 1 min. with ultrasonic no deterioration of coatings and markings terminal strength jis-c-5202 6.1 direct load for 10 sec. in the direction of the terminal leads 2.5kg (24.5n) pulse overload jis-c-5202 5.8 4 times rcwv 10,000 cycles (1 sec. on, 25 sec. off) 1.0%+0.05 load life in humidity jis-c-5202 7.9 402c, 90-95% rh at rcwv for 1,000 hr. (1.5 hr. on, 0.5 hr. off) 1.5%+0.05 load life jis-c-5202 7.10 70c at rcwv for 1,000 hr. (1.5 hr. on, 0.5 hr. off) 1.5%+0.05 temperature cycling jis-c-5202 7.4 -55c ? room temp. ? +155c ? room temp. (5 cycles) 0.75%+0.05 resistance to soldering heat jis-c-5202 6.4 35010c for 30.5 sec. 0.25%+0.05 overload flame retardant jis-c-5202 7.12 4 times rcwv for 1 min. no evidence of faming or arcing
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