power metal film resistors mf-s series ? small size for power rating ? range of 4 sizes: 0.5 watt to 3 watt at 70?c ? flameproof protection mf1/2s mf1s mf2s mf3s 0 . 3 0 . 2 0 . 1 5 . 0 s t t a w c ? 0 7 t a g n i t a r r e w o p k 0 7 4 1 r 0 m 1 1 r 0 s m h o e g n a r e c n a t s i s e r 0 5 3 s t l o v e g a t l o v t n e m e l e g n i t i m i l 0 1 < 0 5 1 c ? / m p p r c t :350 10 :150 0 0 7 0 0 5 s t l o v e g a t l o v n o i t a l o s i % e c n a r e l o t e c n a t s i s e r 1 : 5, 10 >1 : 1, 2, 5 standard values e24 preferred 0 6 0 8 0 1 1 0 4 1 t t a w / c ? e c n a d e p m i l a m r e h t 5 5 1 o t 5 5 - c ? e g n a r e r u t a r e p m e t t n e i b m a 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 issue c ?01.06 a subsidiary of tt electronics plc welwyn components 147 dimensions (mm) & weight (g) pcb min. mounting bend type l max d max f min d nom centres radius wt.nom mf1/2s 6.2 2.5 21.0 0.6 1.02 0.6 0.3 mf1s 9.0 3.6 19.6 0.8 12.7 1.2 0.5 mf2s 12.5 4.2 17.8 0.8 18.4 1.2 0.9 mf3s 14.5 5.3 23.8 0.8 20.3 1.2 1.1 physical data l d f d 10.2 issue d ?01.07
flameproof power metal film resistors mf-s 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 c ?01.06 welwyn components 148 application notes 1. if the resistors are to dissipate full rate 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. 3. lead formed resistors can also be supplied. standard options of lancet, radial and goalpost forming are shown in lead form information section. b f 1 f 2 6 6 c body location f 1 ? f 2 1.4 mm figure 1 packaging the preferred method of packaging is taped and ammo packed, see figure 1 for critical dimensions. alternative packaging is available by special request. marking mf series resistors are colour coded with 5 bands for 1% tolerance or 4 bands for other tolerances. 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 maximum load: 1000 hours at 70?c 5 % r shelf life: 12 months at room temperature 1 % r derating from rated power at 70?c c ? 5 5 1 t a o r e z % r climatic 1 % r climatic category 40/125/56 temperature rapid change 5 . 0 % r resistance to solder heat 5 . 0 % r performance data type mf 1 / 2 s mf1s mf2s mf3s large ammo pack 5000 2500 2500 1000 standard quantities per package c b e p y t mf 1 / 2 s 52 5 mf1s 52 5 mf2s 52 5 mf3s 67 10 issue d ?01.07
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