General Purpose Surface Welwyn Components Mounted Resistors WCR Series s Excellent reliability Wide range of sizes and ohmic values s Wrap around terminations s Inner electrode protection s Electrical Data 0201 0402 0603 0805 1206 1210 2010 2512 0.05 0.063 0.1 0.125 0.25 0.25 0.5 1.0 Power rating 70C watts Resistance range ohms 10R to 1M0 1R0 to 10M Limiting element votage volts 25 50 150 200 TCR* ppm/C 250 100 200 Resistance Tolerance % 1 Standard values E24 or E96 -55 to 125 Ambient temperature range C Zero-ohm Jumper Chip Rating amps 0.5 1 1.5 2 Zero-ohm Jumper Chip Resistance milliohms <50 * Notes TCR for low values 1R to 10R: -400 to +600ppm/C, 11R to 100R: 200ppm/C TCR for high values 3M3 to 10M: 300ppm/ Physical Data Dimensions (mm) L T C A Style W C 0.6 0.03 0.23 0.03 0.12 0.05 0.15 0.05 0201 0.3 0.03 1.0 0.05 0402 0.5 0.03 0.35 0.05 0.2 0.1 0.25 0.1 T 1.6 0.15 0.5 0.15 0.25 0.2 0.25 0.2 0603 0.8 0.15 A 2.0 0.2 1.25+ 0.2 -0.1 0.5 + 0.15 -0.10 0.4 0.2 0.4 0.2 0805 3.2 +0.1 -0.25 0.55 +0.15 -0.1 0.5 + 0.2-0.25 0.5+ 0.2 -0.25 L 1206 1.6 + 0.1 -0.15 W A 3.2 + 0.1 -0.2 0.55 +0.15 -0.1 0.5 0.25 0.5 0.2 1210 2.6 0.15 Wrap-around terminations 5.0 0.15 0.56 0.15 0.60 0.25 2010 2.5 0.15 0.60 0.25 (3 faces) 6.3 0.15 0.56 0.15 0.60 0.25 0.60 0.25 2512 3.2 0.15 Figure 1 Construction Tin Plating The chips have a high alumina substrate (96% minimum) with Nickel Barrier a ruthenium oxide resistance element and silver palladium, coat Dipped Conductor nickel and tin plated terminations. A glazed protection is applied to the resistive element (See Fig.1) Epoxy Melamine Protection Glass Dielectric Terminations Silver Resistance Element Palladium Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. Strength The terminations meet requirements of IEC 68.2.21. 96% min Alumina Substrate General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. A subsidiary of All information is subject to Welwyns own data and is considered accurate at time of going to print. TT electronics plc Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Iss 07.03 Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.comGeneral Purpose Surface Mounted Resistors WelwynComponents WCR Series Table 1 Marking All resistors are individually marked with 3 digits. The first two Resistance Noise value ohms dB digits are the significant figures and the third defines the 100R -10 number of added zeros. Jumpers are marked 000. Types 0201 >100R, 10K 0 and 0402 have no marking. >10K, 100K +15 E96 1% components that can not be marked with 4 digits >100K, 1M0 +20 will be marked with a standard 3 digit code. Details can be >1M0 +30 supplied upon request. Solvent Resistance The protective epoxy lacquer and marking are resistant to all normal industrial cleaning fluids suitable for printed circuits. Performance Data Maximum Change 0201 0402 0603 0805 1206 1210 2010 2512 Load: 1000 hrs at 70C R% 10R-100K : 1 4R7-100K : 1 1R-100K : 1 1R-100K : 1 1R-100K : 1 1R-100K : 1 1R-100K : 1 3% + 0.1R >100K : 2 >100K : 2 >100K : 2 >100K : 2 >100K : 2 >100K : 2 >100K : 2 Shelf life: 12 months at room temp. R% 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 zero 125 C Derate linearly to zero from 70C Short term overload (6.25 x rated power) 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 Climatic Catagory 55/125/56 1 Long term damp heat 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 Noise see table 1 Insulation resistance ohms > 1G Voltage proof volts 100 500 500 500 500 500 500 Packaging Packaging All chips are tape mounted and supplied on standard 8mm Chip Resistor Labstock For Designers All chips are tape mounted and supplied on standard 8mm Chip Resistor Labstock For Designers tape reel, as IEC publication 286-3. WCR chip resistors are available in a special package of the most tape reel, as IEC publication 286-3. WCR chip resistors are available in a special package of the most 180mm (7 inch) reel is standard popular sizes containing 50 each of the E24 values. 180mm (7 inch) reel is standard carries 5,000 pieces. popular sizes containing 50 each of the E24 values. 250mm (10 inch) reel carrying double the standard quantity Please contact the sales desk for full details of this excellent (Except 0402 carries 10,000 pieces) Please contact the sales desk for full details of this excellent can be supplied by agreement. solution for designers and your prototype build requirements. Note: For zero ohm jumper chips use the dummy value & tolerance code R005J 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 02.09 Issue D 07.03