Trimmable Surface Mount Resistors Welwyn Components CRT Series • 40% adjustment available • Wrap around terminations • Inner electrode protection Electrical Data Commercial CRT0805 CRT1206 CRT1210 Power rating at 70°C 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 125°C ppm/°C 250 % ± 20 °C -55 to 125 *Resistance tolerance at 20°C 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 0.4±0.2 0.50 Wrap-around terminations (3 faces) -0.05 -0.15 0.5±0.2 0.5±0.2 0.55 T A L A W 0.55 -0.05 Construction Marking The chips have a high alumina substrate (96% minimum) with ruthenium oxide resistance element and silver palladium, nickel and solder plated terminations. A glass dielectric coat is applied to the resistive element. All relevant information recorded on the reel. Solvent Resistance 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. A subsidiary of TT electronics plc © 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 Issue B · 03.02 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 70°C Derate linearly to zero from 70°C Zero at 125°C Packaging Parts supplied Tape and Reel 5000 pieces per 7” reel as per IEC 286-3. © 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 36 Issue B · 03.02