Series Excellent pulse withstand performance Improved working voltage

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Series Excellent pulse withstand performance Improved working voltage

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Pulse Withstanding Chip Resistors
Series Excellent pulse withstand performance Improved working voltage Improved power rating Standard chip sizes (0805 2512) Custom designs available
Welwyn Components
Size Power @70°C Resistance range Tolerance Operating temperature Thermal Impedance trace area* Values Pulse capability Ohms ppm/°C °C/W +155 0805 0.125 1206 0.33 0.5, values: <10R:200 10R:100 2010 0.75 2512
preferred other values special order graphs full application note available request
*Recommended minimum adjacent trace area each termination rated power dissipation
Physical Data
Dimensions resistors given below weight 0805 1206 2010 2512 2.0±0.3 3.2±0.4 5.1±0.3 6.5±0.3 1.25±0.2 1.6±0.2 2.5±0.2 3.2±0.2 0.3±0.15 0.4±0.2 0.6±0.3 0.6±0.3 0.3±0.1 0.4±0.15 0.6±0.25 0.6±0.25 0.009 0.020 0.036 0.055
Wrap-around terminations faces)
Construction
Thick film resistor material, overglaze organic protection screen printed alumina substrate. Wrap-around terminations have electroplated nickel barrier solder coating, this ensures excellent `leach' resistance properties solderability.
Marking
Components marked. Reels marked with type, value, tolerance, date code quantity.
Solvent Resitance
body protection resistant normal industrial cleaning solvents suitable printed circuits.
General Note
Welwyn Components reserves right make changes product specification without notice liability. information subject Welwyn's data considered accurate time going print. subsidiary electronics Issue 03.06
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, Telephone: 1670 822181 Facsimile: 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
Pulse Withstanding Chip Resistors
Series
Welwyn Components
Performance Data
Size Load rated power: Shelf life test: Overload: heat:
1000 hours 70°C
Maximum Volts Zero 155°C 0.25 0.25
Typical 0.25 0.02 0.25 0.05 0.05
months room temperature
Derating from rated power 70°C
6.25 rated power seconds 1000 hours 155°C
Long term damp heat Temperature rapid change Resistance solder heat Voltage proof
Note: 0.01 addition added performance resistors Ohms.
Pulse Performance Data
1.2/50µs Lightning Surge
10000
Peak voltage (volts)
1000 0805 1206 2010 2512
Lightning Surge
Resistors tested accordance with 115-1 using both 1.2/50µs 10/700µs pulse shapes. limit acceptance shift resistance less than from initial value.
1000 10000 Value (ohms) 100000 1000000 10000000
10/700µs Lightning Surge
10000
Peak Voltage (Volts)
1000 0805 1206 2010 2512
1000 10000 Value (ohms) 100000 1000000 10000000
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, Telephone: 1670 822181 Facsimile: 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
Issue 03.06
Pulse Withstanding Chip Resistors
Series
Welwyn Components
Pulse Performance Data
Single Pulse
1000
Pulse Power
0805 1206 2010 2512
0.0001
0.001
Single Impulse
single impulse graph result impulses rectangular shape applied minute intervals. limit acceptance shift resistance less than from initial value. power applied subject restrictions maximum permissible impulse voltage graph shown.
0.01 Pulse Duration
Continuous Pulses
Pulse Power
0805 1206 2010 2512
Continuous Load Repetitive Pulses
continuous load grpah obtained applying repetitive rectangular pulses where pulse period adjusted that average power dissipated resistor equal rated power 70°C. Again limit acceptance shift resistance less than from initial value.
0.0001
0.001
0.01 Pulse Duration
Pulse Voltage
10000
Pulse Voltage (Volts)
1000 0805 1206 2010 2512
0.0001
0.001
0.01 Pulse Duration
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, Telephone: 1670 822181 Facsimile: 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
Issue 03.06
Pulse Withstanding Chip Resistors
Series
Welwyn Components
Thermal Performance Data
Ambient Temperature Temperature Rise Rated Power
Temperature Derating Curve
Temperature Rise Curves
Power Dissipation 0805 1206 2010 2512
Packaging
0805 1206 series resistors supplied carrier tape inch reels 286-3, quantity reel; 3000.
Marking
tape: 12mm tape: 13mm 0.15
2010 2512 series resistors supplied 12mm carrier tape inch reels 286-3, quantity reel; 2010 3000pcs; 2512 1800pcs. Reels 1000pcs available request.
Tape dimensions
0.15
0805 1206 2010 2512
±0.3
±0.1
±0.1
±0.05
±0.1
±0.2
±0.1 1.75 1.75 1.75 1.75
±0.05
±0.1 1.65 1.95 2.79 3.61
±0.1 2.45 3.55 5.89 6.96
±0.1 0.91 1.17
±0.05 0.28 0.28
0.05 0.05 0.06 0.06
Application Notes
resistors ideally suited handling automatic methods their rectangular shape small dimensional tolerances. Electrical connection ceramic substrate printed circuit board made reflow wave soldering wrap-around terminations. Wrap-around terminations provide good leach properties ensure reliable contact. robust construction, immersed solder bath seconds 260°C. This enables resistor mounted side printed circuit board wire-leaded components applied other side. resistors themselves operate maximum temperature 155°C. soldered resistors, joint temperature should exceed 110°C. This condition when stated power levels 70°C recommended trace areas used. Allowance should made smaller areas copper used. full Application Note Series available.
Ordering Procedure
Specify type reference shown this example PWC2512 ohms Type Size Value (use IEC62 code) Tolerance (use IEC62 code)
0.5%
2512
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, Telephone: 1670 822181 Facsimile: 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
Issue 03.06
±0.15 1.21 1.45

Series Excellent pulse withstand performance Improved working voltage

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