PWC WELWYN | Alldatasheet

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Technical content

  • Excellent pulse withstand performance
  • Improved working voltage
  • Improved power rating
  • Standard chip sizes (0805 to 2512)
  • Custom designs available 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. © 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 Electrical Data Issue G · 03.06 A subsidiary of TT electronics plc Size 0805 1206 2010 2512 Power @70°C W 0.125 0.33 0.75 1.5 Resistance range Ohms 1R0 to 10M Tolerance % 10R to 1M: 0.5, All values: 1, 5 LEV V 150 200 400 500 TCR ppm/°C <10R:200 ≥10R:100 Operating temperature °C -55 to +155 Thermal Impedance °C/W 220 160 80 50 Pad / trace area* mm 2 40 50 60 100 Values E24 or E96 preferred other values to special order Pulse capability See graphs - full application note available on request Physical Data 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. Dimensions of PWC resistors are given below in mm and weight in g L W T max A B C Wt. T WA A B L Wrap-around terminations (3 faces) *Recommended minimum pad & adjacent trace area for each termination for rated power dissipation on FR4 PCB Welwyn ComponentsWelwyn Components

© 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 Performance Data Size Maximum Typical Load at rated power: 1000 hours at 70°C ∆R% 1 0.25 Shelf life test: 12 months at room temperature ∆R% 0.1 0.02 Derating from rated power at 70°C Zero at 155°C Overload: 6.25 x rated power for 2 seconds ∆R% 1 0.1 Dry heat: 1000 hours at 155°C ∆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 Voltage proof Volts 500 Pulse Performance Data 1.2/50µs Lightning Surge 100 1000 10000 1 10 100 1000 10000 100000 1000000 10000000 Value (ohms) Peak voltage (volts) 0805 1206 2010 2512 10/700µs Lightning Surge 100 1000 10000 1 10 100 1000 10000 100000 1000000 10000000 Value (ohms) Peak Voltage (Volts) 0805 1206 2010 2512 Lightning Surge Resistors are tested in accordance with IEC 60 115-1 using both 1.2/50µs and 10/700µs pulse shapes. The limit of acceptance is a shift in resistance of less than 1% from the initial value. Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms. Welwyn ComponentsWelwyn Components

© 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 Performance Data Single Pulse 100 1000 0.0001 0.001 0.01 0.1 1 Pulse Duration ti (s) Pulse Power P (W) 0805 1206 2010 2512 Continuous Pulses 0.1 100 0.0001 0.001 0.01 0.1 1 Pulse Duration ti (s) Pulse Power P (W) 0805 1206 2010 2512 Pulse Voltage 100 1000 10000 0.0001 0.001 0.01 0.1 1 Pulse Duration ti (s) Pulse Voltage (Volts) 0805 1206 2010 2512 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. 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 70°C. Again the limit of acceptance was a shift in resistance of less than 1% from the initial value. Welwyn ComponentsWelwyn Components

Temperature Derating Curve 125 Ambient Temperature /°C % of Rated Power 100-15 70 155 Pulse Withstanding Chip Resistors PWC Series © 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 Thermal Performance Data Issue G · 03.06 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. 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 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. PWC 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. 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%. Temperature Rise Curves Power Dissipation /W Temperature Rise /°C 0 0.5 1 1.5 0805 1206 2010 2512 Application Notes 2.5 ± 0.5 13 ± 0.5 33 ± 1.0 Marking 0.8 ± 0.15 80 ± 2 178 ± 2 9.0 8mm tape: 9mm ± 0.5 12mm tape: 13mm ± 0.5 + 0.1 - 0.15 GF W E T Tape dimensions in mm W P1 P0 P2 D0 D1 E F A0 B0 K0 T T1 T2 Type PWC 2512 - 10K F Size Value (use IEC62 code) Tolerance (use IEC62 code) D0 . 5 % F1 % J5 % Welwyn ComponentsWelwyn Components