FCR 1 / 4 FCR 1 / 2 power rating @ 70? watts 0.25 0.5 resistance range ohms 10r - 300r 10r - 100r tcr ppm/? ?00 ?00 resistance tolerance % 5 5 ambient temperature range ? -55 to 125 values e24 preferred max standoff voltage 100v fusing surface mounted resistors FCR series fuses under overload conditions flow or re-flow soldering excellent stability 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 fusing characteristics issue c ?04.03 a subsidiary of tt electronics plc welwyn components FCR 1 / 4 FCR 1 / 2 resistance ohms 10r - 27r 30r - 300r 10r -100r fusing power watts 3.75 3.00 4.50 fusing time 1 to 60 seconds physical data 22 power rating for resistors operated in ambient temperatures above 70?. power rating must be derated in accordance with the derating curve. packaging parts supplied tape and reel 5000 pieces per 7?reel as per iec 286-3. 100 80 60 40 20 0 (%) - 55 0 70 125 ( c) ambient temperature power rating t w a a l wrap-around terminations (3 faces) dimensions (mm) type l w a t FCR 1 / 4 3.20 2.60 0.50 0.55 ?.15 ?.15 ?.20 ?.15 FCR 1 / 2 5.00 2.50 0.60 +0.1529 ?.15 ?.15 ?.25 0.55 -0.05 FCR_c.qxd 28/4/03 9:52 am page 1
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