Pulse Withstanding Withstanding Pulse Resistors Chip Resistors Welwyn Components PWC Series PWC Series Excellent pulse withstand performance Excellent withstand Improvedpulse working voltageperformance Improved voltage Improved working power rating Improved power rating Standard chip sizes (0805 to 2512) Custom designs available Standard chip sizes (0805 to 2512) Anti-sulphur version available Custom designs available * * * * * * Electrical Data Size 1206 0805 Power @70C 0.125 W Resistance range 0.33 0.5 Ohms Tolerance % LEV V TCR ppm/C Operating temperature 2010 2512 0.75 1 1.5 2 1R0 to 10M 10R to 1M: 0.5, All values: 1, 5 150 200 400 500 <10R:200 10R:100 C -55 to +155 Thermal Impedance C/W 220 160 145 80 70 55 40 Pad / trace area * mm 40 50 125 60 250 100 500 2 Values E96 preferred - other values to special order See graphs - full application note available on request Pulse Capability *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 W T max A B C Wt. 0805 2.00.3 1.250.2 0.6 0.30.15 0.9 min 0.30.1 0.009 1206 3.20.4 1.60.2 0.7 0.40.2 1.7 min 0.40.15 0.020 2010 5.10.3 2.50.2 0.8 0.60.3 3.0 min 0.60.25 0.036 2512 6.50.3 3.20.2 0.8 0.60.3 4.4 min 0.60.25 0.055 C T A B L A W Wrap-around terminations (3 faces) Construction Marking 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. Components are not marked. Reels are marked with type, value, tolerance, date code and quantity. Note that anti-sulphur version parts below 100R are produced in flip-chip format with the resistor element on the underside. Solvent Resistance The body protection is resistant to all normal industrial cleaning solvents suitable for printed circuits. General Note Note General Welwyn Components reserves right to make in changes in specification product specification without TT electronics reserves the right the to make changes product without notice or notice liability.or liability. All information is subject to Welwyn's own data and is considered accurate at time of going to print. All information is subject to TT electronics' own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) Welwyn Components Limited * Bedlington, Northumberland NE22 7AA, UK (c) TT electronics plc822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com Telephone: +44 (0) 1670 07. 08 11.12 37 Pulse PulseWithstanding Withstanding Chip ChipResistors Resistors Welwyn Components PWC Series PWC Series Performance Data Size Maximum Typical 0.25 Load at rated power: 1000 hours at 70C R% 1 Shelf life test: 12 months at room temperature R% 0.1 0.02 Derating from rated power at 70C Zero at 155C Overload: 6.25 x rated power for 2 seconds R% 1 Dry heat: 1000 hours at 155C 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 0.25 0.05 Resistance to sulphur-bearing gas (AS version only): ASTM-B-809 Voltage proof 0.1 Volts 500 Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms. Pulse Performance Data 1.2/50 s Lightning Surge 10000 1000 Peak Voltage (Volts) ) s lt o (v e g a tl o v k a e P O805 1206 2010 2512 100 10 1 10 100 1000 10000 100000 1000000 10000000 Value (ohms) Lightning Surge lightning surge resistors are tested in accordance with IEC 60 115-1 using both 1.2/50s and 10/700s pulse shapes. 10 pulses are applied. The limit of acceptance is a shift in resistance of less than 1% from the initial value. 10/700 s Lightning Surge 10000 Peak Voltage (Volts) 1000 O805 1206 2010 2512 100 10 1 10 100 1000 10000 100000 1000000 10000000 Value (ohms) General Note TT electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT electronics' own data and is considered accurate at time of going to print. www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 (c) TT electronics plc822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com 07. 08 11.12 Pulse Withstanding Pulse Withstanding Chip Resistors Chip Resistors Welwyn Components PWC Series PWC Series Pulse Performance Data Single Pulse 1000 Pulse Power P (W) 100 O805 1206 2010 2512 10 Single Impulse 1 0.0001 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. 0.001 0.01 0.1 1 Pulse Duration ti (s) Continuous Pulses 100 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. 10 Pulse Power P (W) Continuous Load Due to Repetitive Pulses O805 1206 2010 2512 1 0.1 0.0001 0.001 0.01 0.1 1 Pulse Duration ti (s) Pulse Voltage 10000 Pulse Voltage (Volts) 1000 O805 1206 2010 2512 100 10 0.0001 0.001 0.01 0.1 1 Pulse Duration ti (s) General Note TT Welwyn electronics reserves the right to make changes in product specification without notice (c) Components Limited Bedlington, Northumberland NE22 7AA, UK or liability. 07.08 Telephone: +44 is (0)subject 1670 822181 * Facsimile: +44data (0) and 1670is 829465 * Email: info@welwyn-tt.com * Website: All information to TT electronics' own considered accurate at time of going to print. www.welwyn-tt.com 12. 08 www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) TT electronics plc 11.12 Pulse PulseWithstanding Withstanding Chip ChipResistors Resistors Welwyn Components PWC Series PWC Series Temperature Derating Curve Temperature Rise /C % of Rated Power Thermal Performance Data 125 100 75 50 25 0 -15 70 Ambient Temperature /C 155 Temperature Rise Curves 80 0805 1206 2010 2512 60 40 20 0 0 0.5 1 Power Dissipation /W 1.5 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. 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. 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 Example: PWC2512 at 2.0 kilohms and 5% tolerance on a reel of 1800 pieces PWC Type 2512 2K0 J I 3000/reel 1800/reel 1000/reel Standard Size Termination Standard terminations AS Anti-sulphur terminations Value (use IEC62 code) Tolerance (use IEC62 code) D F 0.5% 1% J 5% Packing I Tape T1 (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK General Note 0805, 1206 or 2010 2512 All sizes Telephone: +44 (0) 1670 Facsimile: +44 in (0)product 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com TT electronics reserves the822181 right to* make changes specification without notice or liability. All information is subject to TT electronics' own data and is considered accurate at time of going to print. 09. 09 www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) TT electronics plc 11.12