Trimmable Surface Mount Resistors Welwyn Components CRT Series * 40% adjustment available * Wrap around terminations * Inner electrode protection Electrical Data CRT0805 CRT1206 CRT1210 Power rating at 70C Commercial watts 0.1 0.125 0.25 Resistance range ohms 10R to 1M 10R to 1M 10R to 1M volts 100 200 200 Limiting element voltage TCR -55 to 125C ppm/C 250 % 20 C -55 to 125 *Resistance tolerance at 20C Standard values E24 Ambient temperature range *Tolerance +0-30% is available. Physical Data Dimensions (mm) & Weight (g) Type CRT0805 CRT1206 CRT1210 L W +0.2 +0.2 2.0 1.25 -0.1 -0.1 +0.1 +0.1 3.2 1.6 -0.15 -0.15 -0.05 +0.10 +0.1 +0.15 3.2 2.6 -0.15 -0.15 A T +0.15 0.40.2 0.50 Wrap-around terminations (3 faces) -0.05 -0.15 0.50.2 0.50.2 0.55 T A L A W 0.55 -0.05 Construction Marking The chips have a high alumina substrate (96% minimum) with All relevant information recorded on the reel. ruthenium oxide resistance element and silver based terminations, plated with nickel and tin. A protective coating Solvent Resistance is applied to the resistive element. The chips are resistant to all normal industrial cleaning fluids suitable for printed circuits. Terminations Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. 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. (c) 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 A subsidiary of TT electronics plc 06.08 35 Trimmable Surface Mount Resistors Welwyn Components CRT Series Performance Data Maximum Typical R% 3 0.4 Short term overload (6.25 x rated power) R% 2.5 0.4 Long term damp heat R% 3 0.5 Temperature rapid change R% 1 0.1 Resistance to solder heat R% 2.5 0.2 Load at rated power: 1000 hours at 70C Derate linearly to zero from 70C Zero at 125C Packaging Parts supplied Tape and Reel 5000 pieces per 7" reel as per IEC 286-3. Ordering Procedure Example: CRT1/8 (1206) at 4.7 kilohms maximum with +0 / -30% tolerance on a reel of 5000 pieces CRT1/8- 4K7QI Type Size Value (use IEC62 code) Tolerance (use IEC62 code) M Q 20% +0, -30% Packing I Tape All sizes 5000/reel Standard (c) 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 36 06.08