flameproof metal film resistors fa series approval to bs cecc 40101-019 and 40101-024 resistance range 0.1 ohm to 1m ohm flameproof protection fa025 fa05 FA1 fa94 power rating at 70? watts 0.5 1.0 1.5 2.0 resistance range ohms 0r1 to 1m 0r1 to 1m 0r1 to 1m 2r6 to 1m0 limiting element voltage volts 350 350 500 700 isolation voltage volts 500 500 700 1000 tcr ppm/? 150 resistance tolerance % 1 ohm: 5, 10 >1 ohm: 1, 2, 5 ambient temperature range ? -55 to 155 general note welwyn components reserves the right to make changes in product specification without notice or liability. all information is subject to welwyn s own data and is considered accurate at time of going to print. ?welwyn components limited ?bedlington, northumberland ne22 7aa, uk telephone: +44 (0) 1670 822181 ?facsimile: +44 (0) 1670 829465 ?email: info@welwyn-tt.com ?website: www.welwyn-tt.com electrical data * approved cecc 40101-019 / 40101-024 fx ex dx cx power rating at 70? watts 0.25 0.5 1.0 2.0 resistance range ohms 1 to 1m 1 to 1m 1 to 1m 10 to 100k limiting element voltage volts 250 350 500 700 isolation voltage volts 500 700 1000 1400 **tcr ppm/? 250 resistance tolerance % 1, 2, 5 ambient temperature range ? -55 to 125 standard values e24 preferred thermal impedance c/watt 140 110 90 60 issue b ?03.02 a subsidiary of tt electronics plc welwyn components 145 *these specificatios are identical except that bs cecc 40101-024 includes flammability tests. **specification tcr - actual tcr as for commercial. l d f d dimensions (mm) & weight (g) pcb min. mounting bend type l max d max f min d nom centres radius wt.nom fa025 6.2 2.5 21.0 0.6 10.2 0.6 0.3 fa05 9.0 3.6 19.6 0.8 12.7 1.2 0.5 FA1 14.5 5.3 23.6 0.8 20.3 1.2 1.1 fa94 13.1 5.9 29.5 0.8 19.5 1.2 1.1 physical data
flameproof power metal film resistors fa series ? welwyn components limited bedlington, northumberland ne22 7aa, uk telephone: +44 (0) 1670 822181 ?facsimile: +44 (0) 1670 829465 ?email: info@welwyn-tt.com ?website: www.welwyn-tt.com issue b ?03.02 welwyn components 146 application notes 1. if the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than 4mm from the body. 2. due to operating temperature limitations imposed by some pcb materials, derating may be necessary. an estimate of the temperature rise to be expected can be calculated using the thermal impedance figures given under electrical data. b f 1 f 2 6 6 c body location f 1 ?f 2 1.4 mm packaging all fa series resistors are normally supplied tape packed ready for loading onto automatic sequencing and insertion machines. component wires will not protrude beyond the outside edge of the tapes. alternative packaging available by request. lead formed resistors can also be supplied. standard options of lancet, radial and goalpost forming are shown in lead form information section. marking resistors are colour coded with 4 bands. iec 62 colours are used. solvent resistance the body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. flammability the resistors will not burn or emit incandescent particles under any condition of applied temperature or power overload. construction the resistance element is a precisely controlled thin film of metal alloy on a high purity ceramic core, protected by a cement coating applied so that terminations remain completely clear. this permits a well defined body length, (clean lead to clean lead dimension l). terminations material solder-coated copper wire. strength the terminations meet the requirements of iec 68.2.21 solderability the terminations meet the requirements of iec 115-1, clause 4.17.3.2 cecc 40101-019/40101-024 actual performance requirements maximum typical load at commercial rating: 1000 hrs at 70? ? r % not specified 3 1 load at cecc rating: 1000 hrs at 70? 2 2 1 load at 35% rated power: 1000 hrs at 125? ? r % 2 1 0.7 dry heat: 1000 hours at 155? ? r % not specified 1 0.7 shelf life: 12 months at room temperature ? r % not specified 0.5 0.5 derating 35% of rated power at 125? zero at 235? short term overload ? r % 0.5 0.2 0.02 climatic ? r % 2 0.5 0.5 climatic category ? r % 55/125/56 55/125/56 long term damp heat ? r % 2 2 0.5 temperature rapid change ? r % 0.5 0.25 0.05 resistance to solder heat ? r % 0.5 0.25 0.07 vibration and bump ? r % 0.5 0.1 0.01 performance data type fa025 fa05 FA1 fa94 large ammo pack 5000 2500 1000 1000 standard quantities per package type b c fa025/fa05 52 5 FA1 67 10 fa94 77 10
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