Double-Sided Chip Resistors Welwyn Components DSC Series • Two parallel resistance elements in a single chip • Excellent pulse withstand performance • Laser trimmed up to 0.5% tolerance • Enhanced working voltage • Enhanced power rating • Pb-free terminations Electrical Data 1206 2010 2512 Power @70°C Watts 0.33 0.75 1.5 2 second overload power @25°C Watts 2.1 4.7 9.4 Short pulse performance See graphs Resistance range Ohms Tolerance 1R0 to 4M7 % LEV Volts TCR ppm/°C Operating temperature 10R to 1M: 0.5, All values: 1, 5 200 400 °C -55 to +155 Dielectric withstand voltage Volts Thermal Impedance °C/W 160 mm 50 Pad & trace area for rated power* 500 <10R:200 >10R:100 _ 500 2 Values 80 50 60 100 E24 or 96 preferred - other values to special order * Recommended minimum pad & adjacent trace area for each termination for rated power dissipation on FR4 PCB Physical Data Dimensions (mm) & Weight (g) 1206 L W T max A B min C Wt. 3.2±0.4 1.6±0.2 0.7 0.4±0.2 1.7 0.4±0.15 0.020 C T A 2010 2512 5.1±0.3 6.5±0.3 2.5±0.2 3.2±0.2 0.8 0.8 0.6±0.3 0.6±0.3 3.0 4.4 0.6±0.25 0.6±0.25 0.036 0.055 B L A W Wrap-around terminations (3 faces) Construction Thick film resistor material, overglaze and organic protection are screen printed on a 96% alumina substrate. Wrap-around terminations have an electroplated nickel barrier and Pb-free solderable coating, this ensures excellent ‘leach’ resistance properties and solderability. Marking Components are not marked. Reels are marked with type, value, tolerance, date code and quantity. Solvent Resistance The body protection is resistant to all normal industrial cleaning solvents suitable for printed circuits. 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 · 01.06 Double Sided Chip Resistors Welwyn Components DSC Series Performance Data Maximum Load at rated power: ∆R% 1000 hours at 70°C 0.25 Derating from rated power at 70°C Overload: Zero at 155°C 6.25 x rated power for 2 seconds Shelf life test: Typical 1 12 months at room temperature ∆R% 1 0.1 ∆R% 0.1 0.02 ∆R% 1 0.2 Long term damp heat ∆R% 1 0.25 Temperature rapid change ∆R% 0.25 0.05 Resistance to solder heat ∆R% 0.25 0.05 Dry heat: 1000 hours at 155°C Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms. Pulse Performance Data Lightning Surge 1.2/50µs Lightning Surge 10,000 Peak Voltage (V) Resistors have been tested in accordance with IEC 60 115-1 using both 1.2/50µs and 10/700µs pulse shapes. Also, the 2512 size has been tested to the Bellcore GR1089 2/10µs and 10/1000µs pulse shapes. The limit of acceptance is a shift in resistance of less than 1% from the initial value. 1,000 1206 2010 2512 100 10 1 10 100 1,000 10,000 100,000 1,000,000 10,000,000 Value (Ohms) 10/700µs Lightning Surge Peak Voltage (V) 10,000 1,000 1206 2010 2512 100 10 10 100 1,000 10,000 100,000 1,000,000 10,000,000 Value (Ohms) © 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 · 01.06 Double Sided Chip Resistors Welwyn Components DSC Series DSC2512 - Bellcore GR1089 Lightning Surge Peak Voltage (V) 10,000 2/10us 1,000 10/1000us 100 1 10 100 1,000 10,000 100,000 1,000,000 10,000,000 Value (Ohms) Single Pulse Single Pulse 1,000 Peak Power (W) The single impulse graph is the result of 50 impulses of rectangular shape applied at one-minute intervals. The limit of acceptance was a shift in resistance of less than 1% from the initial value. 100 1206 2010 2512 10 1 0.0001 0.001 0.01 0.1 1 Pulse Duration (s) Continuous Load Due to Repetitive Pulses Continuous Pulses 1,000 Peak Power (W) The continuous load graph was obtained by applying repetitive rectangular pulses where the pulse period was adjusted so that the average power dissipated in the resistor was equal to its rated power at 70°C. Again the limit of acceptance was a shift in resistance of less than 1% from the initial value. 100 1206 2010 2512 10 1 0.0001 0.001 0.01 0.1 1 Pulse Duration (s) © 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 · 01.06 Double Sided Chip Resistors Welwyn Components DSC Series Thermal Performance Data Temperature Derating Curve % of Rated Power 125 100 75 50 25 0 -15 70 155 Ambient Temperature/°C Temperature Rise/°C Temperature Rise Curves 80 60 1206 2010 40 2512 20 0 0 0.5 1 1.5 Power Dissipation/W Packaging 1206 DSC series resistors are supplied on 8mm carrier tape and 7 inch reels as per IEC 286-3, quantity per reel; 3000. 2010 and 2512 DSC series resistors are supplied on 12mm carrier tape and 7 inch reels as per IEC 286-3, quantity per reel; 2010 : 3000pcs; 2512 : 1800pcs. Reels of 1000pcs are available on request. T2 T 33 ± 1.0 P2 Wr G B0 80 ± 2 178 ± 2 F 13 ± 0.5 W E Marking (Both sides) P0 D0 T1 0.8 ± 0.15 2.5 ± 0.5 A0 K0 D1 P1 Tape and reel dimensions (mm) W P1 P0 P2 D0 D1 E F A0 B0 K0 T T1 T2 ±0.3 ±0.1 ±0.1 ±0.05 ±0.1 ±0.2 ±0.1 ±0.05 ±0.1 ±0.1 ±0.1 ±0.05 nom ±0.15 1206 8 4 4 2 1.5 1 1.75 3.5 1.95 3.55 1.0 0.2 0.05 1.3 2010 12 4 4 2 1.5 1.5 1.75 5.5 2.79 5.89 0.91 0.28 0.06 1.21 2512 12 8 4 2 1.5 1.5 1.75 5.5 3.61 6.96 1.17 0.28 0.06 1.45 © 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 · 01.06 Double Sided Chip Resistors Welwyn Components DSC Series Application Notes DSC resistors are ideally suited for handling by automatic methods due to their rectangular shape and the small dimensional tolerances. Electrical connection to a ceramic substrate or to a printed circuit board can be made by reflow or wave soldering of wrap-around terminations. Wrap-around terminations provide good leach properties and ensure reliable contact. Due to the robust construction, the DSC can be immersed in the solder bath for 30 seconds at 260°C. This enables the resistor to be mounted on one side of a printed circuit board and wire-leaded components applied on the other side. DSC is compatible with typical Pb-free soldering materials and temperature profiles DSC resistors themselves can operate at a maximum temperature of 155°C. For soldered resistors, the joint temperature should not exceed 110°C. This condition is met when the stated power levels at 70°C and recommended pad and trace areas are used. Allowance should be made if smaller areas of copper are used. Ordering Procedure Specify type reference etc as shown in this example of DSC2512 10K ohms 1%. Type DSC 2512 - 10K F T18 Size Value (use IEC62 code) Tolerance (use IEC62 code) D 0.5% F 1% J 5% Packing T3 T18 Tape 1206 or 2010 3000/reel 2512 1800/reel © 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 Standard Issue B · 01.06