FCR_C.qxd 28/4/03 9:52 am Page 1 Fusing Surface Mounted Resistors Welwyn Components FCR Series • Fuses under overload conditions • Flow or re-flow soldering • Excellent stability Electrical Data FCR 1/4 FCR 1/2 Power Rating @ 70°C watts 0.25 0.5 Resistance range ohms 10R - 300R 10R - 100R ±500 ±500 ±5 ±5 TCR ppm/°C Resistance tolerance % Ambient temperature range °C -55 to 125 Values E24 preferred Max standoff voltage 100V Fusing Characteristics 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 Dimensions (mm) Type FCR1/4 L W A T 3.20 2.60 0.50 0.55 ±0.15 ±0.15 ±0.20 ±0.15 5.00 2.50 0.60 +0.1529 ±0.15 ±0.15 ±0.25 0.55 -0.05 Wrap-around terminations (3 faces) T FCR1/2 A L A W Power Rating Packaging Parts supplied Tape and Reel 5000 pieces per 7” reel as per IEC 286-3. (%) 100 80 Power Rating For resistors operated in ambient temperatures above 70°C. Power rating must be derated in accordance with the derating curve. 60 40 20 0 - 55 0 70 Ambient temperature 125 (°C) 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: [email protected] · Website: www.welwyn-tt.com 22 A subsidiary of TT electronics plc Issue C · 04.03