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| Double-Sided Chip Resistors DSC Series Welwyn Components * 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 Power @70C 2 second overload power @25C Short pulse performance Resistance range Tolerance LEV TCR Operating temperature Dielectric withstand voltage Thermal Impedance Pad & trace area for rated power* Values Ohms % Volts ppm/C C Volts C/W mm 2 2010 0.75 4.7 See graphs 1R0 to 4M7 10R to 1M: 0.5, All values: 1, 5 2512 1.5 9.4 Watts Watts 0.33 2.1 200 400 <10R:200 >10R:100 _ -55 to +155 500 500 160 50 80 60 E24 or 96 preferred - other values to special order 50 100 *Recommended minimum pad & adjacent trace area for each termination for rated power dissipation on FR4 PCB Physical Data Dimensions (mm) & Weight (g) L 1206 2010 2512 3.20.4 5.10.3 6.50.3 W 1.60.2 2.50.2 3.20.2 T max 0.7 0.8 0.8 A 0.40.2 0.60.3 0.60.3 B min 1.7 3.0 4.4 C 0.40.15 0.60.25 0.60.25 Wt. 0.020 A C T B L 0.036 0.055 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 Issue B * 01.06 (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 Double Sided Chip Resistors DSC Series Welwyn Components Performance Data Maximum Load at rated power: Overload: Dry heat: 1000 hours at 70C Typical 0.25 Zero at 155C 0.1 0.02 0.2 0.25 0.05 0.05 R% R% R% R% R% R% R% 1 1 0.1 1 1 0.25 0.25 Derating from rated power at 70C 6.25 x rated power for 2 seconds 12 months at room temperature Shelf life test: 1000 hours at 155C Long term damp heat Temperature rapid change Resistance to solder heat Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms. Pulse Performance Data Lightning Surge Resistors have been tested in accordance with IEC 60 115-1 using both 1.2/50s and 10/700s pulse shapes. Also, the 2512 size has been tested to the Bellcore GR1089 2/10s and 10/1000s pulse shapes. The limit of acceptance is a shift in resistance of less than 1% from the initial value. 1.2/50s Lightning Surge 10,000 Peak Voltage (V) 1,000 1206 2010 2512 100 10 1 10 100 1,000 10,000 100,000 1,000,000 10,000,000 Value (Ohms) 10/700s Lightning Surge 10,000 Peak Voltage (V) 1,000 1206 2010 2512 100 10 10 100 1,000 10,000 100,000 1,000,000 10,000,000 Value (Ohms) (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 B * 01.06 Double Sided Chip Resistors DSC Series Welwyn Components DSC2512 - Bellcore GR1089 Lightning Surge 10,000 Peak Voltage (V) 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 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. Single Pulse 1,000 Peak Power (W) 100 1206 2010 2512 10 1 0.0001 0.001 0.01 0.1 1 Pulse Duration (s) Continuous Load Due to Repetitive Pulses 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 70C. Again the limit of acceptance was a shift in resistance of less than 1% from the initial value. 1,000 Continuous Pulses Peak Power (W) 100 1206 2010 2512 10 1 0.0001 0.001 0.01 0.1 1 Pulse Duration (s) (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 B * 01.06 Double Sided Chip Resistors DSC Series Welwyn Components Thermal Performance Data Temperature Derating Curve 125 % of Rated Power 100 75 50 25 0 -15 70 155 Ambient Temperature/C Temperature Rise Curves Temperature Rise/C 80 60 40 20 0 0 0.5 1 1.5 1206 2010 2512 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 D0 P2 P0 Marking (Both sides) 33 1.0 T Wr E 178 2 80 2 B0 T1 A0 K0 P1 D1 2.5 0.5 0.8 0.15 Tape and reel dimensions (mm) W 0.3 1206 2010 2512 8 12 12 P1 0.1 4 4 8 P0 0.1 4 4 4 P2 0.05 2 2 2 D0 0.1 1.5 1.5 1.5 D1 0.2 1 1.5 1.5 E 0.1 1.75 1.75 1.75 F 0.05 3.5 5.5 5.5 A0 0.1 1.95 2.79 3.61 B0 0.1 3.55 5.89 6.96 K0 0.1 1.0 0.91 1.17 T 0.05 0.2 0.28 0.28 T1 nom 0.05 0.06 0.06 T2 0.15 1.3 1.21 1.45 (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 G Issue B * 01.06 W 13 0.5 F Double Sided Chip Resistors DSC Series Welwyn Components 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 260C. 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 155C. For soldered resistors, the joint temperature should not exceed 110C. This condition is met when the stated power levels at 70C 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 Size Value (use IEC62 code) Tolerance (use IEC62 code) D F J 0.5% 1% 5% T3 T18 Tape 1206 or 2010 2512 3000/reel 1800/reel DSC 2512 - 10K F T18 Packing 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 Issue B * 01.06 |
Price & Availability of DSC
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