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| Pulse Withstanding Chip Resistors PWC Series * Excellent pulse withstand performance * Improved working voltage * Improved power rating * Standard chip sizes (0805 to 2512) * Custom designs available Welwyn Components Electrical Data Size Power @70C Resistance range Tolerance LEV TCR Operating temperature Thermal Impedance Pad / trace area* Values Pulse capability W Ohms % V ppm/C C C/W mm2 220 40 160 50 150 200 -55 to +155 80 60 50 100 0805 0.125 1206 0.33 1R0 to 10M 10R to 1M: 0.5, All values: 1, 5 400 500 <10R:200 10R:100 2010 0.75 2512 1.5 E24 or E96 preferred other values to special order See graphs - full application note available on request *Recommended minimum pad & adjacent trace area for each termination for rated power dissipation on FR4 PCB Physical Data Dimensions of PWC resistors are given below in mm and weight in g L 0805 1206 2010 2512 2.00.3 3.20.4 5.10.3 6.50.3 W 1.250.2 1.60.2 2.50.2 3.20.2 T max 0.6 0.7 0.8 0.8 A 0.30.15 0.40.2 0.60.3 0.60.3 B 0.9 min 1.7 min 3.0 min 4.4 min C 0.30.1 0.40.15 0.60.25 0.60.25 Wt. 0.009 0.020 0.036 0.055 A B L A W T 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 solder 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 Resitance 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 G * 03.06 (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 37 Pulse Withstanding Chip Resistors PWC Series Welwyn Components Performance Data Size Load at rated power: Shelf life test: Overload: Dry heat: 1000 hours at 70C Maximum R% R% R% R% R% R% R% Volts 1 0.1 Zero at 155C 1 1 1 0.25 0.25 500 Typical 0.25 0.02 0.1 0.2 0.25 0.05 0.05 12 months at room temperature Derating from rated power at 70C 6.25 x rated power for 2 seconds 1000 hours at 155C Long term damp heat Temperature rapid change Resistance to solder heat Voltage proof Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms. Pulse Performance Data 1.2/50s Lightning Surge 10000 Peak voltage (volts) 1000 0805 1206 2010 2512 100 Lightning Surge Resistors are tested in accordance with IEC 60 115-1 using both 1.2/50s and 10/700s pulse shapes. The limit of acceptance is a shift in resistance of less than 1% from the initial value. 10 1 10 100 1000 10000 Value (ohms) 100000 1000000 10000000 10/700s Lightning Surge 10000 Peak Voltage (Volts) 1000 0805 1206 2010 2512 100 10 1 10 100 1000 10000 Value (ohms) 100000 1000000 10000000 (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 G * 03.06 Pulse Withstanding Chip Resistors PWC Series Welwyn Components Pulse Performance Data Single Pulse 1000 Pulse Power P (W) 100 0805 1206 2010 2512 10 1 0.0001 0.001 Single Impulse 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. The power applied was subject to the restrictions of the maximum permissible impulse voltage graph as shown. 0.01 Pulse Duration ti (s) 0.1 1 Continuous Pulses 100 Pulse Power P (W) 10 0805 1206 2010 2512 1 Continuous Load Due to Repetitive Pulses The continuous load grpah 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. 0.1 0.0001 0.001 0.01 Pulse Duration ti (s) 0.1 1 Pulse Voltage 10000 Pulse Voltage (Volts) 1000 0805 1206 2010 2512 100 10 0.0001 0.001 0.01 Pulse Duration ti (s) 0.1 1 (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 G * 03.06 Pulse Withstanding Chip Resistors PWC Series Welwyn Components Thermal Performance Data 125 100 75 50 25 0 -15 70 Ambient Temperature /C 155 Temperature Rise /C % of Rated Power Temperature Derating Curve Temperature Rise Curves 80 60 40 20 0 0 0.5 1 Power Dissipation /W 1.5 0805 1206 2010 2512 Packaging 0805 and 1206 PWC series resistors are supplied on 8mm carrier tape and 7 inch reels as per IEC 286-3, quantity per reel; 3000. Marking T2 P0 D0 P2 8mm tape: 9mm 0.5 12mm tape: 13mm 0.5 33 1.0 9.0 + 0.1 - 0.15 T 2010 and 2512 PWC 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. Tape dimensions in mm 13 0.5 178 2 80 2 B0 F E T1 A0 K0 P1 D1 2.5 0.5 0.8 0.15 0805 1206 2010 2512 W 0.3 8 8 12 12 P1 0.1 4 4 4 8 P0 0.1 4 4 4 4 P2 0.05 2 2 2 2 D0 0.1 1.5 1.5 1.5 1.5 D1 0.2 1 1 1.5 1.5 E 0.1 1.75 1.75 1.75 1.75 F 0.05 3.5 3.5 5.5 5.5 A0 0.1 1.65 1.95 2.79 3.61 B0 0.1 2.45 3.55 5.89 6.96 K0 0.1 0.8 1.0 0.91 1.17 T 0.05 0.2 0.2 0.28 0.28 T1 nom 0.05 0.05 0.06 0.06 Application Notes PWC 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 PWC 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. PWC 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. A full Application Note on the PWC Series is available. Ordering Procedure Specify type reference etc as shown in this example of PWC2512 10K ohms 1%. Type Size Value (use IEC62 code) Tolerance (use IEC62 code) D F J 0.5% 1% 5% PWC 2512 - 10K F (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 G * 03.06 G T2 0.15 1.1 1.3 1.21 1.45 W |
Price & Availability of PWC2512-10KD
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