Resistors
Pulse Withstanding
Welwyn Components
Chip Resistors
Pulse Withstanding
Chip Resistors
PWC Series
Excellent pulse withstand performance
PWC Series
Improved working voltage
Excellent pulse withstand performance
Improved power rating
Improved working voltage
Standard chip sizes (0805 to 2512)
Improved power rating
CustomCustom designs a designsv ailableavailable
Anti-sulphur version availab le
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
Size PWC0603 PWC0805 PWC1206 PWC2010 PWC2512
0.125 0.25 0.33 0.5 0.75 1 1.5 2
Power @70C W
Resistance range ohms 1R0 to 10M
Tolerance % 10R to 1M: 0.5, All values: 1, 5
LEV V 75 150 200 400 500
<10R:200 10R:100
TCR ppm/C
Operating temperature C -55 to +155
Thermal Impedance C/W 302 220 160 145 80 70 55 40
2
Pad / trace area * mm 30 40 50 125 60 250 100 500
Values
E96 preferred - other values to special order
See graphs full application note available on request
Pulse Capability
*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
C
L W T max A B C Wt.
T
1.50.1 0.80.1 0.55 0.30.15 0.6 min 0.30.15 0.002
0603
A
B
2.00.3 1.250.2 0.6 0.30.15 0.9 min 0.30.1 0.009
0805
L
W
A
1206 3.20.4 1.60.2 0.7 0.40.2 1.7 min 0.40.15 0.020
Wrap-around terminations
(3 faces)
2010 5.10.3 2.50.2 0.8 0.60.3 3.0 min 0.60.25 0.036
2512 6.50.3 3.20.2 0.8 0.60.3 4.4 min 0.60.25 0.055
Construction Marking
Thick film resistor material, overglaze and organic protection Components are not marked. Reels are marked with type,
are screen printed on a 96% alumina substrate. Wrap-around value, tolerance, date code and quantity.
terminations have an electroplated nickel barrier and solder
coating, this ensures excellent leach resistance properties Solvent Resistance
and solderability. The body protection is resistant to all normal industrial
cleaning solvents suitable for printed circuits.
Note that anti-sulphur version parts below 100R are
produced in flip-chip format with the resistor element on
the underside.
General Note
General Note
BI Technologies IRC Welwyn
Welwyn Components reserves the right to make changes in product specification without notice or liability.
TT Electronics reserves the right to make changes in product specification without notice or liability.
A subsidiary of
All information is subject to Welwyns 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.
TT electronics plc
Pulse Withstanding
Pulse Withstanding
Chip Resistors
Chip Resistors
PWC Series
Welwyn Components
PWC Series
Performance Data
Size Maximum Typical
Load at rated power: 1000 hours at 70C R% 1 0.25
Shelf life test: 12 months at room temperature R% 0.1 0.02
Derating from rated power at 70C Zero at 155C
Overload: 6.25 x rated power for 2 seconds R% 1 0.1
Dr y heat: 1000 hours at 155C 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
Resistance to sulphur-bearing gas (AS version only): ASTM-B-809 0.25 0.05
Voltage proof Volts 500
Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms.
Pulse Performance Data
Pulse Performance Data
Lightning Surge
lightning surge resistors are tested in accordance with IEC 60 115-1 using both 1.2/50s and 10/700s pulse shapes. 10 pulses are applied. The limit of
acceptance is a shift in resistance of less than 1% from the initial value.
2512
2010
1206
0805
0603
Lightning Surge
lightning surge resistors are tested in
accordance with IEC 60 115-1 using
both 1.2/50s and 10/700s pulse shapes.
10 pulses are applied. The limit of
acceptance is a shift in resistance of less
than 1% from the initial value.
2512
2010
1206
0805
0603
General Note
BI Technologies IRC Welwyn
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics own data and is considered accurate at time of going to print.