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
·
·
·
·
·
·
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
0.125
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
11.12
37
Pulse Withstanding
Pulse Withstanding
Chip Resistors
Chip Resistors
PWC Series
PWC Series
Welwyn Components
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
Resistance to sulphur-bearing gas (AS version only): ASTM-B-809
Voltage proof
Volts
Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms.
ΔR%
ΔR%
ΔR%
ΔR%
ΔR%
1
1
1
0.25
0.25
0.25
500
ΔR%
ΔR%
Maximum
1
0.1
Zero at 155°C
0.1
0.2
0.25
0.05
0.05
0.05
Typical
0.25
0.02
Pulse Performance Data
1.2/50 s Lightning Surge
10000
)
s
t
l
o
v
(
e
g
a
t
l
o
v
k
a
e
P
1000
O805
1206
2010
2512
Peak Voltage (Volts)
100
10
1
10
100
1000
10000
100000
1000000
10000000
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.
Value (ohms)
10/700 s Lightning Surge
10000
1000
Peak Voltage (Volts)
O805
1206
2010
2512
100
10
1
10
100
1000
10000
100000
1000000
10000000
Value (ohms)
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670
© TT electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
07. 08
11.12
Pulse Withstanding
Pulse Withstanding
Chip
Chip
Resistors
Resistors
PWC Series
PWC Series
Welwyn Components
Pulse Performance Data
Single Pulse
1000
100
Pulse Power P (W)
O805
1206
2010
2512
10
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.
100
1
0.0001
0.001
0.01
Pulse Duration ti (s)
0.1
1
Continuous Pulses
Pulse Power P (W)
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.
10
O805
1206
2010
2512
1
0.1
0.0001
0.001
0.01
Pulse Duration ti (s)
0.1
1
Pulse Voltage
10000
1000
Pulse Voltage (Volts)
O805
1206
2010
2512
100
10
0.0001
0.001
0.01
Pulse Duration ti (s)
0.1
1
General Note
TT electronics
Components Limited
Bedlington, Northumberland NE22 7AA, UK
© Welwyn
reserves the right to make changes in product specification without notice or liability.
07.08
Telephone: +44
is subject
822181 · Facsimile: +44 (0)
and is
829465 · Email: info@welwyn-tt.com
to print.
www.welwyn-tt.com
All information
(0) 1670
to TT electronics’ own data
1670
considered accurate at time of going
· Website:
12. 08
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
11.12
Pulse Withstanding
Pulse Withstanding
Chip Resistors
Chip Resistors
PWC
Series
PWC
Series
Welwyn Components
Thermal Performance Data
125
100
75
50
25
0
-15
70
Ambient Temperature /°C
155
Temperature Rise /°C
% of Rated Power
Temperature Derating Curve
Temperature Rise Curves
80
60
40
20
0
0
0.5
1
Power Dissipation /W
1.5
0805
1206
2010
2512
Packaging
0805 and 1206 PWC series resistors are supplied on 8mm carrier tape and 7 inch reels as per IEC 286-3, quantity per reel; 3000.
2010 and 2512 PWC series resistors are supplied on 12mm carrier tape and 7 inch reels as per IEC 286-3, quantity per
reel; 2010 : 3000pcs; 2512 : 1800pcs.
Reels of 1000pcs are available on request.
Application Notes
PWC resistors are ideally suited for handling by automatic
methods due to their rectangular shape and the small
dimensional tolerances. Electrical connection to a ceramic
substrate or to a printed circuit board can be made by reflow
or wave soldering of wrap-around terminations.
Wrap-around terminations provide good leach properties and
ensure reliable contact. Due to the robust construction, the
PWC can be immersed in the solder bath for 30 seconds at
260°C. This enables the resistor to be mounted on one side
of a printed circuit board and wire-leaded components
applied on the other side.
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. Allowance should be made if
smaller areas of copper are used.
A full Application Note on the PWC Series is available.
Ordering Procedure
Example: PWC2512 at 2.0 kilohms and 5% tolerance
on a reel of 1800 pieces -
Type
Size
Termination
Standard terminations
AS Anti-sulphur terminations
Value (use IEC62 code)
Tolerance (use IEC62 code)
D
F
0.5%
1%
PWC
2512
2K0
J
I
J
5%
Packing
I
T1
Tape
0805, 1206 or 2010
2512
All sizes
3000/reel
1800/reel
1000/reel
Standard
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
General Note
Telephone: +44 (0) 1670 822181 ·
make changes in product specification without notice or liability.
Website: www.welwyn-tt.com
TT electronics reserves the right to
Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com ·
09. 09
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
11.12
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