General Purpose Surface Mounted Resistors Welwyn Components WCR Series * Excellent reliability * Wide range of sizes and ohmic values * Wrap around terminations * Inner electrode protection Electrical Data 0402 0603 1206 0805 2010 2512 watts 0.063 0.1 0.125 0.25 0.5 1.0 ohms to 2M2 1R to 22M 1R to 22M 1R to 22M 1R to 10M to 10M 4R7 1R volts 50 50 150 200 200 200 ppm / C s e e t a b l e b e l o w % see table below E24 / E96 preferred. Other values to special order Power rating at 70 C Resistance range Limiting element voltage T CR Resistance tolerance Standard values Ambient temperature range C Zero Ohm Jumper Chip Rating A Zero Ohm Jumper Chip Resistance mOhms -55 to 155 1 1.5 2 2 <50 <50 <50 <50 1 <50 Tolerance/Resistance/TCR Tolerance 0.5% 1% 2% 5% 10% WCR 2010 WCR 2512 WCR 0402 WCR 0603 WCR 0805 WCR 1206@1/4W Ohmic Ohmic TCR Ohmic TCR TCR Ohmic TCR Ohmic TCR Ohmic TCR Range ppm Range ppm Range ppm Range ppm Range ppm Range ppm (Ohms) / C (Ohms) /C * (Ohms) /C * (Ohms) /C * (Ohms) /C * (Ohms) /C* MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX 100R 100K 50 100R 100K 50 100R 100K 100 10R 1MO 100 1R 10M 100 1R 10M 100 10R 1M 100 1R0 9R1 -100 to +600 1R 10M 300 10R 1M 200 1R 10M 200 1R 10M 200 10R 1M 200 10R 1M0 100 10R 1M 200 4R7 2M2 300 1R 10M 200 1R 10M 200 10R 1M 200 1M0 10M 300 1R 10M 300 11M 22M 300 11M 22M 300 * Notes -*Note: TCR forTCR low for values to 10R: to +600ppm/C, 11R to 100R: 200ppm/C low1Rvalues 1R-400 to 4R3 -100 to +600 ppm/C. TCR for high values 3M3 to 22M: 300ppm/ TCR for high values 3M3 to 22M 300ppm/C. Physical Data Dimensions (mm) Style L W T C A 0402 1.0 0.05 0.5 0.03 0.35 0.05 0.20 0.1 0.25 0.1 0.5 + 0.15 -0.05 0603 1.6 0.15 0.8 0.15 0.25 0.2 0.25 0.2 + 0.15 -0.10 0805 2.0 + 0.2 1.25 + 0.2 -0.1 0.5 0.4 0.2 0.4 0.2 0.55 + 0.15 -0.05 0.5 + 0.2 -0.25 0.5 + 0.2 -0.25 1206 3.2 + 0.1 -0.15 1.6 + 0.1 -0.15 2010 5.0 0.15 2.5 0.15 0.56 0.15 0.60 0.25 0.60 0.25 2512 6.3 0.15 3.2 0.15 0.56 0.15 0.60 0.25 0.60 0.25 C T A L W A Wrap-around terminations (3 faces) 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 Iss 07.03 15 General Purpose Surface Mounted Resistors Welwyn Components WCR Series Figure 1 Construction Tin Plating Nickel Barrier Dipped Conductor The chips have a high alumina substrate (96% minimum) with a ruthenium oxide resistance element and silver palladium, nickel and tin plated terminations. A glazed protection coat is applied to the resistive element (See Fig.1) Terminations Solderability Strength Silver Palladium The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. The terminations meet requirements of IEC 68.2.21. Marking Epoxy Melamine Protection Glass Dielectric Resistance Element 96% min Alumina Substrate All resistors are individually marked with 3 digits. The first two digits are the significant figures and the third defines the number of added zeros. Jumpers are marked 000. Types 0201 and 0402 have no marking. Table 1 Resistance value ohms 100R >100R, 10K >10K, 100K >100K, 1M0 >1M0 E96 1% components that can not be marked with 4 digits will be marked with a standard 3 digit code. Details can be supplied upon request. Solvent Resistance The protective epoxy lacquer and marking are resistant to all normal industrial cleaning fluids suitable for printed circuits. Noise dB -10 0 +15 +20 +30 Performance Data Maximum Change 0201 Load: 1000 hrs at 70C Shelf life: 12 months at room temp. 0402 0603 0805 1206 R% 10R-100K : 1 4R7-100K : 1 1R-100K : 1 1R-100K : 1 1R-100K : 1 R% >100K : 2 >100K : 2 >100K : 2 >100K : 2 >100K : 2 0.2 0.2 0.2 0.2 0.2 1210 2010 1R-100K : 1 1R-100K : 1 >100K : 2 >100K : 2 0.2 0.2 2512 3% + 0.1R 0.2 zero @ 125 C Derate linearly to zero from 70C R% 2 2 2.5 2.5 2.5 2.5 2.5 5 Max voltage volts 50 100 100 200 400 400 400 400 Climatic R% 3 3 3 3 3 3 3 3 Short term overload (6.25 x rated power) Climatic Catagory Long term damp heat 55/125/56 <1% tol: 1, >2% tol: 3 R% Temperature rapid change R% 1 1 1 1 1 1 1 1 Resistance to solder heat R% 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 Vibration and bump R% 1 1 1 1 1 1 1 1 500 500 500 500 Noise see table 1 Insulation resistance ohms Voltage proof volts > 1G 100 Packaging Packaging All chips are tape mounted and supplied on standard 8mm All chips are tape mounted and supplied on standard 8mm tape reel, as IEC publication 286-3. tape reel, as IEC publication 286-3. 180mm (7 inch) reel is standard 180mm standard carriesthe 5,000 pieces. 250mm (7 (10inch) inch)reel reeliscarrying double standard quantity (Except 0402 carries 10,000 pieces) can be supplied by agreement. 250mm (10 inch) reel carrying double the standard quantity can be supplied by agreement. 500 500 Chip Resistor Labstock For Designers Chip Resistor Labstock For Designers WCR chip resistors are available in a special package of the most WCR chip resistors are available in a special package of the most popular sizes containing 50 each of the E24 values. popular sizes containing 50 each of the E24 values. Please contact the sales desk for full details of this excellent Please contact the sales desk for full details of this excellent solution for designers and your prototype build requirements. solution for designers and your prototype build requirements. Note: For zero ohm jumper chips use the dummy value & tolerance code R005J (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 Issue D * 05.08 07.03