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Resistive Components
Welwyn Components Limited
Welwyn Electronics Park, 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
IRC Inc. (AFD)
4222 South Staples Street
Corpus Christi, Texas 78411, USA
Telephone:+1 985 992 7900
Facsimile: +1 985 992 3377
Email: ircafd@irctt.com
Website: www.irctt.com
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
Issue 8 · 13.06.01
Subsidiaries of TT electronics plc
Performance Data
Physical Data
Thin film resistor material, overglaze and organic protection
are screen printed on a 96% alumina substrate. Wrap-
around terminations have an electroplated nickel barrier
and tin-lead solder coating, this ensures excellent ‘leach’
resistance properties and solderability. Chips can withstand
immersion in solder at 260°C for 30 seconds.
Maximum
Typical
Load at rated power:
1000 hours at 70°C
R%
R%
2
0.25
Shelf life:
12 months at room temperature
0.1
0.02
Derating from rated power at 70°C
Zero at 155°C
Overload:
6.25 x rated power for 5 seconds
R%
R%
R%
R%
R%
Volts
1
0.1
Dry heat: 1000 hours at 155°C
1
0.2
Long term damp heat
1
0.25
Temperature rapid change
0.25
0.05
Resistance to solder heat
0.25
0.05
Voltage proof
500
L
W
T max
A
B*
C
Wt.
0805
2.0±0.3
1.25±0.2
0.6
0.3±0.15
0.9 min
0.3±0.1
0.009
1206
3.2±0.4
1.6±0.2
0.7
0.4±0.2
1.7 min
0.4±0.15
0.020
2010
5.1±0.3
2.5±0.2
0.8
0.6±0.3
3.0 min
N/A
0.036
2512
6.5±0.3
3.2±0.2
0.8
0.6±0.3
4.4 min
N/A
0.055
Note: An 0.01 ohm addition to be added to the performance of all resistors <10 ohms.
* This dimension determines the number of conductors which may pass under the surface mounted chip.
Dimensions of PWC chips are given below in mm and weight in g.
Construction & Solderability
T
W
A
A
B
L
Wrap-around terminations
(3 faces)
Note: Circuit diagrams shown for example only. Single, continuous pulse and pulse voltage graphs are based on theoretical data.
Welwyn Components Ltd. have over 60 years experience
in designing and manufacturing resistive components.
Excellence in Technology
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