Pulse Withstanding Chip Resistors
PWC SERIES
• Excellent Pulse Withstand Performance
• Improved working voltage
• Improved power rating
• Standard chip sizes (0805 to 2512)
Electrical Data
Size 0805 1206 2010 2512
Power @70°C 0.125W 0.33W 0.75W 1.5W
Resistance range 1R0 to 10M
Tolerance 0.5*, 1, 5%
LEV 150V 200V 400V 500V
TCR <10R:200ppm/°C >10R:100ppm/°C
Operating temperature -55 to +155°C
Values E96 preferred other values to special order
Pulse Capability See graphs – full application note available on request
*0.5% Tolerance only available on values 10R to 1M0
Physical Data
Dimensions of PWC resistors are given below in mm and weight in g
L W T max A B* C Wt.
0805
2.0±0.3 1.25±0.2 0.6 0.3±0.15 0.9 min 0.3±0.1 0.009
1206
3.2±0.4 1.6±0.2 0.7 0.4±0.2 1.7 min 0.4±0.15 0.020
2010
5.1±0.3 2.5±0.2 0.8 0.6±0.3 3.0 min N/A 0.036
2512 6.5±0.3 3.2±0.2 0.8 0.6±0.3 4.4 min N/A 0.055
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 IRC –– Advanced Film Division Advanced Film Division
4222 South Staples Street, Corpus Christi, Texas, 78411,USA. Tel: 361-992-7900 Fax: 361-992-3377 Web: www.irctt.com
Construction
Thick film resistor material, overglaz
e 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.
Issue A 15-8-2001 SM
B
Performance Data
Maximum Typical
Load at rated power: 1000 hours at 70°C ∆R% 1 0.25
Shelf life test: 12 months at room temperature ∆R% 0.1 0.02
Derating from rated power at 70°C Zero at 155°C
Overload: 6.25 x rated power for 5 seconds ∆R% 1 0.1
Dry heat: 1000 hours at 155°C ∆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
Voltage proof Volts 500
Note: An 0.01 ohm addition to be added to the performance of all resistors <10 ohms.
Pulse Performance Data
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 IRC –– Advanced Film Division Advanced Film Division
4222 South Staples Street, Corpus Christi, Texas, 78411,USA. Tel: 361-992-7900 Fax: 361-992-3377 Web: www.irctt.com
1.2/50µµs Lightning Surge
10
100
1000
10000
1 10 100 1000 10000 100000 1000000 10000000
Value (ohms)
Peak voltage (volts)
O805
1206
2010
2512
10/700µµs Lightning Surge
10
100
1000
10000
1 10 100 1000 10000 100000 1000000 10000000
Value (ohms)
Peak Voltage (Volts)
O805
1206
2010
2512
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.
Issue A 15-8-2001 SM
Pulse Performance Data
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 IRC –– Advanced Film Division Advanced Film Division
4222 South Staples Street, Corpus Christi, Texas, 78411,USA. Tel: 361-992-7900 Fax: 361-992-3377 Web: www.irctt.com
Single Pulse
1
10
100
1000
0.0001 0.001 0.01 0.1 1
Pulse Duration ti (s)
Pulse Power P (W)
O805
1206
2010
2512
Continuous Pulses
0.1
1
10
100
0.0001 0.001 0.01 0.1 1
Pulse Duration ti (s)
Pulse Power P (W)
O805
1206
2010
2512
Pulse Voltage
10
100
1000
10000
0.0001 0.001 0.01 0.1 1
Pulse Duration ti (s)
Pulse Voltage (Volts)
O805
1206
2010
2512
Single Impulse.
The single impulse graph is the
result of 50 impulses of
rectangular shape applied at one
minute intervals. The limit of
accep
tance 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
ob
tained 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.
Issue A 15-8-2001 SM
Packaging
Resistors are supplied tape and reel as per IEC 286-3.
Type 1206 2010 2512
Reel 3,000 3,000 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 - 10K F
Type
Size
Value (use IEC62 code)
Tolerance (use IEC 62 code)
D 0.5%
F 1%
J 5%
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 IRC –– Advanced Film Division 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
