Pulse Withstanding
Pulse Withstanding
Chip
Resistors
Resistors
PWC Series
PWC Series
Excellent pulse withstand performance
Excellent pulse withstand performance
Improved working voltage
Improved working voltage
Improved power rating
Improved
chip sizes (0805 to 2512)
Standard
power rating
Custom designs available
Standard chip sizes (0805 to 2512)
Anti-sulphur version available
Custom designs available
Welwyn Components
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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
145
125
80
60
70
250
55
100
40
500
0805
0.25
0.33
1206
0.5
0.75
1R0 to 10M
10R to 1M: 0.5, All values: 1, 5
400
<10R:200
≥10R:100
500
2010
1
1.5
2512
2
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
C
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.
Note that anti-sulphur version parts below 100R are
produced in flip-chip format with the resistor element on
the underside.
Marking
Components are not marked. Reels are marked with type,
value, tolerance, date code and quantity.
Solvent Resistance
The body protection is resistant to all normal industrial
cleaning solvents suitable for printed circuits.
General Note
General Note
Welwyn Components reserves
to
right
changes
changes in product specification without
liability.
TT electronics reserves the right
the
make
to make
in product specification without notice or
notice 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.
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
A subsidiary of
TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
07. 08
05.13
37
WELWYN [ WELWYN COMPONENTS LIMITED ]
