Pulse Withstanding Chip Resistors
PWC SERIES
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•
•
•
Excellent Pulse Withstand Performance
Improved working voltage
Improved power rating
Standard chip sizes (0805 to 2512)
Electrical Data
Size
Power @70°C
Resistance range
Tolerance
LEV
TCR
Operating temperature
Values
Pulse Capability
0805
0.125W
1206
0.33W
1R0 to 10M
0.5*, 1, 5%
150V
200V
400V
500V
<10R:200ppm/°C >10R:100ppm/°C
-55 to +155°C
E96 preferred other values to special order
See graphs – full application note available on request
*0.5% Tolerance only available on values 10R to 1M0
2010
0.75W
2512
1.5W
Physical Data
Dimensions of PWC resistors are given below in mm and weight in g
0805
1206
2010
2512
L
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
N/A
N/A
Wt.
0.009
0.020
0.036
0.055
B
Construction
Thick film resistor material, overglaze and
organic protections are screen printed on a 96%
alumina substrate. Wrap-around terminations
have an electroplated nickel barrier and tin-lead
solder coating; this ensures excellent ‘leach’
resistance properties and solderability. Chips
can withstand immersion in solder at 260°C for
30 seconds.
Marking
No marking provided.
Solvent Resistance
The body protection and marking are resistant to
all normal industrial cleaning solvents suitable
for printed circuits.
General Note
IRC, reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own test data and is considered accurate at time of print.
Issue A 15-8-2001 SM
©
IRC – Advanced Film Division
4222 South Staples Street, Corpus Christi, Texas, 78411,USA. Tel: 361-992-7900 Fax: 361-992-3377 Web: www.irctt.com
Performance Data
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 5 seconds
Dry heat: 1000 hours at 155°C
Long term damp heat
Temperature rapid change
Resistance to solder heat
Voltage proof
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
Volts
Maximum
1
0.1
Zero at 155°C
1
1
1
0.25
0.25
500
0.1
0.2
0.25
0.05
0.05
Typical
0.25
0.02
Note: An 0.01 ohm addition to be added to the performance of all resistors <10 ohms.
Pulse Performance Data
1.2/50µ s Lightning Surge
µ
10000
1000
Peak voltage (volts)
O805
1206
2010
2512
100
Lightning Surge
Resistors
are
tested
in
accordance with IEC 60 115-1
using both 1.2/50us and
10/700us pulse shapes. The
limit of acceptance is a shift in
resistance of less than 1%
from the initial value.
10
1
10
100
1000
10000
100000
1000000
10000000
Value (ohms)
10/700µ s Lightning Surge
µ
10000
1000
Peak Voltage (Volts)
O805
1206
2010
2512
100
10
1
10
100
1000
10000
100000
1000000
10000000
Value (ohms)
General Note
IRC, reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own test data and is considered accurate at time of print.
Issue A 15-8-2001 SM
©
IRC – Advanced Film Division
4222 South Staples Street, Corpus Christi, Texas, 78411,USA. Tel: 361-992-7900 Fax: 361-992-3377 Web: www.irctt.com
Pulse Performance Data
S in g l e P u l s e
1000
100
Pulse Power P (W)
O805
1206
2010
2512
10
Pulse Power P (W)
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. The power
applied was subject to the
restrictions of the maximum
permissible impulse voltage
graph as shown.
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.
1
0.0001
0.001
0.01
Pulse Duration ti (s)
0.1
1
Continuous Pulses
100
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)
O 8 0 5
1206
2010
2512
100
10
0.0001
0.001
0.01
Pulse Duration ti (s)
0.1
1
General Note
IRC, reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own test data and is considered accurate at time of print.
©
IRC – Advanced Film Division
4222 South Staples Street, Corpus Christi, Texas, 78411,USA. Tel: 361-992-7900 Fax: 361-992-3377 Web: www.irctt.com
Issue A 15-8-2001 SM
Packaging
Resistors are supplied tape and reel as per IEC 286-3.
Type
Reel
1206
3,000
2010
3,000
2512
1,800
Mounting
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 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.
Operating Temperature Range
PWC resistors themselves can operate at a maximum temperature of 155°C (see performance above). For
soldered resistors, the joint temperature should not exceed 110°C. This condition is met when the stated
power levels at 70°C are used.
Ordering Procedure
Specify type reference etc as shown in this example of PWC2512 10K ohms 1%.
PWC 2512
Type
Size
Value (use IEC62 code)
Tolerance (use IEC 62 code)
D
F
J
0.5%
1%
5%
-
10K
F
General Note
IRC, reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own test data and is considered accurate at time of print.
Issue A 15-8-2001 SM
©IRC
– Advanced Film Division
IRC
4222 South Staples Street, Corpus Christi, Texas, 78411,USA. Tel: 361-992-7900 Fax: 361-992-3377 Web: www.irctt.com
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