Resistors
PWC Series
Pulse Withstanding
Pulse Withstanding Chip Resistors
Chip Resistors
Excellent pulse withstand performance
PWC Series
Improved working voltage
Excellent pulse withstand performance
Improved power rating
Improved working voltage
Custom designs available
Improved power rating
Anti-sulphur version available
Standard chip sizes (0805 to 2512)
Custom designs available
Welwyn Components
All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
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
302
30
220
40
160
50
75
150
PWC0603
0.125
PWC0805
0.25
PWC1206
0.33
0.5
1R0 to 10M
10R to 1M: 0.5, All values: 1, 5
200
<10R:200
≥10R:100
-55 to +155
145
125
80
60
70
250
55
100
40
500
400
500
PWC2010
0.75
1
PWC2512
1.5
2
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 (mm) & weight (mg)
L
0603
0805
1206
2010
2512
1.6±0.1
2.0±0.15
3.2±0.2
5.1±0.3
6.5±0.3
W
0.8±0.1
1.25±0.15
1.6±0.2
2.5±0.2
3.2±0.2
T max
0.55
0.6
0.7
0.8
0.8
A
0.3±0.15
0.3±0.15
0.4±0.2
0.6±0.3
0.6±0.3
B min
0.6
0.9
1.7
3.0
4.4
C
0.3±0.15
0.3±0.1
0.4±0.15
0.6±0.25
0.6±0.25
Wt.
2.2
4.7
8.5
36
55
A
B
L
C
T
A
W
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 5R 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 the right to make changes in product specification
or liability.
TT Electronics reserves the right to make changes in product specification without notice
without 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.
BI Technologies IRC Welwyn
A subsidiary of
TT electronics plc
www.ttelectronics.com/resistors
07. 08
06.20
© 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
37
Pulse Withstanding Chip Resistors
PWC Series
Performance Data
Size
Load at rated power: 1000 hours at 70°C
Shelf life test: 12 months at room temperature
Derating from rated power at 70°C
Overload: 6.25 x rated power for 2 seconds
Dry heat: 1000 hours at 155°C
Long term damp heat
Temperature rapid change
Resistance to solder heat
Anti-sulphur grade (AS)
ΔR%
ΔR%
ΔR%
ΔR%
Maximum
Typical
1
0.25
0.1
0.02
Zero at 155°C
1
0.1
1
0.2
1
0.25
0.25
0.25
0.25
0.25
1
500
0.25
0.05
0.05
0.05
0.05
0.05
0.25
ΔR%
ΔR%
ΔR%
ASTM-B-809 (1000 hours, 50°C, 91-93% RH)
ΔR%
EIA-977 (750 hours, 105°C)
ΔR%
Sulphur-resistant grade (SR) ASTM-B-809 (1000 hours, 50°C, 91-93% RH)
ΔR%
Modified ASTM-B-809 (1000 hours, 105°C, 85% RH)
ΔR%
Voltage proof
Volts
Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms.
Pulse Performance Data
Lightning Surge
Lightning surge resistors are tested in accordance with IEC 60 115-1 using both 1.2/50µs and 10/700µs 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
2512
2010
1206
0805
0603
General Note
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.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
06.20
Pulse Withstanding Chip Resistors
PWC Series
Single Impulse
The single impulse graph is the result of 50 impulses of rectangular shape applied at one minute intervals. The limit of acceptance was a shift in
resistance of less than 1% from the initial value.
2512
2010
1206
0805
0603
Continuous Load Due to Repetitive Pulses
The continuous load graph was obtained by applying repetitive rectangular pulses where the pulse period was adjusted so that the average
power dissipated in the resistor was equal to its rated power at 70°C. Again the limit of acceptance was a shift in resistance of less than 1% from the
initial value
2512
2010
1206
0805
0603
General Note
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.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
06.20
Pulse
Withstanding Chip Resistors
Pulse
Withstanding
Chip Resistors
PWC Series
PWC Series
Welwyn Components
Thermal Performance Data
% of Rated Power
Temperature Derating Curve
125
100
75
50
25
0
-15
70
Ambient Temperature /°C
155
Packaging
0603, 0805 and 1206 resistors are supplied on 8mm carrier tape and 2010 and 2512 resistors are supplied on 12mm carrier tape,
all on 7 inch reels as per IEC 286-3.
Application Note
PWC resistors themselves can operate at a maximum temperature of 155°C. For soldered resistors, the joint temperature should not exceed 110°C. This
condition is met when the stated power levels at 70°C and recommended pad and trace areas are used. Pad and trace area is defined as the total area of
the solder pad plus all copper trace within two squares of the edge of the solder pad. Allowance should be made if smaller areas of copper are used.
This product has two valid part numbers:
This product has two valid part numbers:
Ordering Procedure
Ordering Procedure
P
W
1
1
Type
2
Size
C
2
5
2
3
Sulphur Grade
1
A full Application Note on the PWC Series is available.
European (Welwyn) Part Number: PWC2512-2K0JI
(2512, 2 kilohms ±5%, Pb-free)
1
2
3
4
Value
-
2
K
4
0
J
5
5
Tolerance
D = ±0.5%
F = ±1%
J = ±5%
I
6
6
Termination & Packing
I = Pb-free, Standard,
PB = SnPb, Standard
0603
5000/reel
0805, 1206,
3000/reel
2010
2512
1800/reel
T1 = Pb-free, 1K reel
All sizes
1000/reel
PWC 0603 Omit for standard E24 = 3/4 characters
0805 AS = Anti-sulphur E96 = 3/4 characters
1206 SR = Sulphur Resistant
R = ohms
2010
K = kilohms
2512
M = megohms
Note 1: For new designs requiring resistance to sulphur-bearing gas, SR grade is preferred.
USA (IRC) Part Number: PWC-PWC2512LF-2K00-J
P
W
1
1
PWC
2
PWC
3
Size
1206
2010
2512
C
-
P
W
2
4
Termination
C
2
5
3
5
Value
1
2
L
4
(2512, 2 kilohms ±5%, Pb-free)
F
-
2
K
5
6
Tolerance
Packing
Plastic tape
1206, 2010
2512
3000/reel
1800/reel
0
0
-
J
6
Family Model
Omit for SnPb E24 = 4 characters D = ±0.5%
LF = Pb-free E96 = 4 characters F = ±1%
R = ohms
J = ±5%
K = kilohms
M = megohms
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
General Note
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
BI Technologies
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.
09. 09
IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
06.20
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