features fuses at 120 v or 240 v e24 resistance values rohs compliant* ul listed applications white goods inverters lighting metering fwxxa series fusible power resistors *rohs directive 2002/95/ec jan. 27, 2003 including annex and rohs recast 2011/65/eu june 8, 2011. speci cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. users should verify actual device performance in their speci c applications. dimensions: mm (inches) electrical characteristics characteristic fw series power 1, 2, 3, 5, 7** w resistance range 4.7 ohms to 100 ohms (e24 values) ul listed resistance range 4.7 ohms to 47 ohms tolerance 5 % temperature coef cient ?00 ppm/? operating temperature range -55 ? to +155 ? maximum voltage p*r fusing point see fusing performance chart fusing time see fusing performance chart product dimensions general introduction the fwxxa series of axial leaded wirewound resistors is designed to fuse under abnormal conditions such as sudden surges in voltage or circuit malfunctions. the resistor will fuse upon application of 120 or 240 voltages. the resistor will fuse safely if 120 or 240 v is applied. the time to fuse depends on the resistance value. ** 7 w = 240 vac only. materials resistor ............... wire wound around a ceramic core lead wire ........................tinned copper housing .......................... insulated resin *rohs compliant agency listing description ul file number: e349323 hl d d (dia.) h model dimensions d (max.) l (max.) hd fw10a (1 w) 5.5 (.217) 12 (.472) 28 ?3.0 (1.102 ?.118) 0.55 ?0.05 (.022 ?.002) fw20a (2 w) 6.0 (.236) 12 (.472) 28 ?3.0 (1.102 ?.118) 0.65 ?0.05 (.026 ?.002) fw30a (3 w) 6.5 (.256) 16 (.630) 28 ?3.0 (1.102 ?.118) 0.75 ?0.05 (.030 ?.002) fw50a (5 w) 7.5 (.295) 18 (.709) 28 ?3.0 (1.102 ?.118) 0.75 ?0.05 (.030 ?.002) fw70a (7 w) 9.5 (.374) 26 (1.024) 38 ?3.0 (1.496 ?.118) 0.75 ?0.05 (.030 ?.002) how to order fw 10 a 7r50 j a model fw = fusible wirewound rated power 10 = 1.0 watts 20 = 2.0 watts 30 = 3.0 watts 50 = 5.0 watts 70 = 7.0 watts pin style a = axial resistance code ?r<100 ohms: ??represents decimal point (examples: 7r50 = 7.5 ohms) ?r 100 ohms: first three digits are signi cant, fourth digit represents number of zeros to follow (example: 1000 = 100 ohms) resistance tolerance j = ? % packaging a = ammo pack ?1,000 pcs./box: fw10, fw20, fw30 ?500 pcs./box: fw50, fw70 resistance value (ohms) resistance code 4.7 4r70 5.1 5r10 5.6 5r60 6.2 6r20 6.8 6r80 7.5 7r50 8.2 8r20 9.1 9r10 10 10r0 popular values
speci cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device perfor mance may vary over time. users should verify actual device performance in their speci c applications. fwxxa series fusible power resistors performance speci cations characteristic limits test method (jis-c-5201 & jis-c-5202) temperature coef? cient 200 ppm/c max. 4.8 natural resistance changes per temperature (c): r 2 -r 2 x 10 6 (ppm/c) r 1 (t 2 -t 1 ) r 1 : resistance value at room temp. (t 1 ) r 2 : resistance value at room temp. +100 c (t 2 ) short time overload resistance change rate is 5 % max., with no evidence of mechanical damage. 4.13 permanent resistance change after the application of a potential of 2.5 times rcwv for 5 seconds. terminal strength no evidence of mechanical damage. 4.16 direct load: resistance to a 2.5 kg direct load for 10 seconds in the direction of the longitudinal axis of the terminal leads. twist test: terminal leads shall be bent through 90 at a point of approximately 6 mm from the body of the resistor and shall be rotated through 360 (about the original axis of the bent terminal) in alternating directions for a total of three rotations. resistance to soldering heat resistance change rate is 1 % max., with no evidence of mechanical damage. 4.18 permanent resistance change when leads are immersed to a point 2.0 to 2.5 mm from the body in 260 c (5 c) solder for 10 (1) seconds. solderability 95 % coverage minimum 4.17 the area covered with a new, smooth, clean, shiny and continuous surface free from concentrated pinholes. test temp. of solder: 245 c (3 c). dwell time in solder: 2~3 seconds. load life in humidity resistance change rate is 5 % max., with no evidence of mechanical damage. 7.9 resistance change after 1,000 hours (1.5 hours on, 0.5 hours off) at rcwv in a humidity test chamber controlled at 40 c (2 c) and 90-95 % relative humidity. safety fuse resistance value shall increase at least 100 times initial value. 1 w ~ 5 w: load 120/240 vac voltage. 7 w: load 240 vac voltage. resistor must be safely fused. dielectric withstanding voltage no evidence of ? ashover mechanical damage, arcing or insulation breakdown. ul1412, 19.1 a resistor (or a resistor and its mounting if provided), shall withstand, without breakdown, for a period of not less than one minute, a 60 hz potential of 1000 v plus twice the rated voltage applied between live parts and dead metal parts, if any. 1st significant figure 2nd significant figure 3rd significant figure multiplier tolerance typical part marking color 1st band 2nd band 3rd band multiplier tolerance black 0 0 0 1 brown 1 1 1 10 1 % red 2 2 2 100 2 % orange 3 3 3 1 k yellow 4 4 4 10 k green 5 5 5 100 k 0.5 % blue 6 6 6 1 m 0.25 % violet 7 7 7 10 m 0.10 % grey 8 8 8 0.05 % white 9 9 9 gold 0.1 5 % silver 0.01 10 %
speci cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device perfor mance may vary over time. users should verify actual device performance in their speci c applications. fwxxa series fusible power resistors fusing performance temperature rise power derating curve pulse performance 1.2/50 s peak voltage limit (10 pulses at 10 sec. intervals, r < 5 %) note: the voltage shown in these curves is the voltage across t he resistor. the generator voltage will be higher due to the gen erator?s internal impedance. 7 w 5 w 3 w 2 w 1 w 0 1 2 3 4 5 6 4.7 5.6 6.8 8.2 10 12 15 18 22 27 33 39 47 68 100 120 20 value (ohms) peak voltage (kv) 0 20 40 60 80 100 120 140 160 180 200 220 240 1 w 2 w 3 w 5 w 7 w 10 20 maximum fusing time (s) initial power (w) 30 40 70 50 60 1 w 2 w 3 w 5 w 7 w rated load (%) 0 20 40 20 60 80 100 100 heat rise (c) 200 300 0 -55 0 50 100 150 200 250 +70 c +155 c +275 c 300 20 40 percent rated load (%) ambient temperature (c) 60 80 100
speci cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device perfor mance may vary over time. users should verify actual device performance in their speci c applications. fwxxa series fusible power resistors 05/13 packaging speci cations model o p a b c qty./box fw10a (1 w) 58 1 (2.283 .039) 5 0.3 (.197 .112) 75 5 (2.953 .197) 70 5 (2.756 .197) 255 5 (10.039 .197) 1,000 pcs. fw20a (2 w) 58 1 (2.283 .039) 5 0.3 (.197 .112) 80 5 (3.150 .197) 82 5 (3.228 .197) 255 5 (10.039 .197) 1,000 pcs. fw30a (3 w) 65 1 (2.559 .039) 10 0.3 (.393 .112) 90 5 (3.543 .197) 119 5 (4.685 .197) 255 5 (10.039 .197) 1,000 pcs. fw50a (5 w) 65 1 (2.559 .039) 10 0.3 (.393 .112) 90 5 (3.543 .197) 88 5 (3.465 .197) 255 5 (10.039 .197) 500 pcs. fw70a (7 w) 65 1 (2.559 .039) 10 0.3 (.393 .112) 90 5 (3.543 .197) 88 5 (3.465 .197) 255 5 (10.039 .197) 500 pcs. dimensions: mm (inches) o l1 l2 z = 1.0 t 61 s t p c b asia-paci c: tel: +886-2 2562-4117 ?fax: +886-2 2562-4116 europe: tel: +41-41 768 5555 ?fax: +41-41 768 5510 the americas: tel: +1-951 781-5500 ?fax: +1-951 781-5700 www.bourns.com
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