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 @70°C
Resistance range
Tolerance
LEV
TCR
Operating temperature
Thermal Impedance
Pad / trace area*
Values
Pulse capability
W
Ohms
%
V
ppm/°C
°C
°C/W
mm
2
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
2.0±0.3
3.2±0.4
5.1±0.3
6.5±0.3
W
1.25±0.2
1.6±0.2
2.5±0.2
3.2±0.2
T max
0.6
0.7
0.8
0.8
A
0.3±0.15
0.4±0.2
0.6±0.3
0.6±0.3
B
0.9 min
1.7 min
3.0 min
4.4 min
C
0.3±0.1
0.4±0.15
0.6±0.25
0.6±0.25
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
© 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
WELWYN [ WELWYN COMPONENTS LIMITED ]
