General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print. A subsidiary of
TT electronics plc
© IRC Advanced Film Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Email: afdsales@irctt.com • Website: www.irctt.com WCR Series Issue February 2005
IRC Advanced Film Division
WCR Series
• Tolerances to ±0.5%
• TCR down to ±50 ppm/°C
• Zero ohm jumpers available
• Wide ohmic range 1 ohm to 22M ohm
• Now supplied with Pb-free terminations
Specifications
P/N TCR
(ppm/C)
Ohmic Range Rated
Power at
70C
(milliwatts)
Max.
Working
Voltage
Max.
Overload
Voltage
Packaging
±5% ±2% ±1% ±0.5% Carrier
Tape Qty.
WCR0402
±200
±100
±50
4R7-1M
N/A
N/A
N/A
N/A
N/A
N/A
10R-1M
N/A
N/A
N/A
N/A
63 50 100 Card-
board 10K
WCR0603
±400
±200
±100
±50
1R0-9R76, 1M1-10M
10R-1M
N/A
N/A
1R0-9R76, 1M1-10M
N/A
10R-1M
N/A
1R0-9R76
N/A
10R-1M
N/A
1R0-9R76
N/A
N/A
1R0-1M
100 50 100 Card-
board 5K
WCR0805
±400
±200
±100
±50
1R0-9R76, 6M2-22M
10R-5.6M
N/A
N/A
N/A
1R0-10M
N/A
N/A
1R0-9R76, 1M1-10M
N/A
10R-976K
N/A
N/A
N/A
N/A
10R-1M
125 150 200 Card-
board 5K
WCR1206
±400
±200
±100
±50
1R0-9R76, 6M2-22M
10R-5M6
N/A
N/A
N/A
1R0-10M
N/A
N/A
1R0-9R76, 1M1-10M
N/A
10R-976K
N/A
N/A
N/A
N/A
10R-1M
250 200 400 Card-
board 5K
WCR1210
±400
±200
±100
1R0-9R76, 1M1-10M
10R-1M
N/A
N/A
10R-1M
N/A
1R0-9R76, 1M1-10M
N/A
10R-976K
N/A
N/A
10R-976K
250 200 400 Plastic 4K
WCR2010
±400
±200
±100
±50
1R0-9R76, 6M2-22M
10R-5M6
N/A
N/A
N/A
10R-1M
N/A
N/A
1R0-9R76, 1M1-10M
N/A
10R-1M
N/A
N/A
N/A
N/A
10R-976K
500 200 400 Plastic 4K
WCR2512
±400
±200
±100
±50
1R0-9R76, 6M2-22M
10R-5M6
N/A
N/A
N/A
10R-1M
N/A
N/A
1R0-9R76, 1M1-10M
N/A
10R-1M
N/A
N/A
N/A
N/A
10R-976K
1000 200 400 Plastic 4K
Nickel
Barrier
Thick Film
Element
Glass
Passivation
Wrap-
around
termination
Organic
Protection
Pb-free
Plating
General Purpose Thick Film
Chip Resistor
WCR Series Issue February 2005
• Corpus Christi Texas 78411 USA
© IRC Advanced Film Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Email: afdsales@irctt.com • Website: www.irctt.com
IRC Advanced Film Division
General Purpose Thick Film
Chip Resistor
Test Conditions Test Method Max Change (5%) Max Change (1%)
Short Time Overload 5 Seconds
2.5 X Rated Power ±2.0% ±0.75%
Temperature Cycling 5 Cycles
-55°C to +125°C ±0.5% ±0.5%
Humidity
1000 Hours
40°C ±2°C
90-95% RH
±3.0% ±1.0%
Load Life 1000 Hours
70°C ±3°C ±3.0% ±1.0%
High Temperature
Exposure
1000 Hours
125°C ±3°C ±1.0% ±1.0%
Low Temperature
Exposure
1000 Hours
-55°C ±3°C ±1.0% ±1.0%
Effects od Solder Heat 10 ±1 Seconds 260°C
±5°C ±1.0% ±0.75%
Solderablitiy 3 ±0.5 Seconds 235°C
±5°C 95% Min Coverage 95% Min Coverage
Environmental Performance
Model L W H a b
WCR0402 0.039±0.002 0.020±0.002 0.014±0.002 0.008±0.004 0.010±0.002
WCR0603 0.063±0.008 0.032±0.008 0.020±0.005 0.012±0.009 0.012±0.009
WCR0805 0.079±0.008 0.049±0.008 0.020±0.005 0.016±0.009 0.012±0.009
WCR1206 0.125±0.009 0.063±0.008 0.024±0.005 0.020±0.013 0.016±0.008
WCR1210 0.126±0.008 0.102±0.008 0.024±0.004 0.020±0.012 0.016±0.008
WCR2010 0.197±0.008 0.098±0.008 0.024±0.004 0.020±0.012 0.016±0.008
WCR2512 0.248±0.008 0.122±0.008 0.024±0.004 0.020±0.012 0.016±0.008
Dimensions (inches)
L
a
WH
b
SIDE
BO TTOM
TOP
WCR Series Issue February 2005
• Corpus Christi Texas 78411 USA
© IRC Advanced Film Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Email: afdsales@irctt.com • Website: www.irctt.com
IRC Advanced Film Division
General Purpose Thick Film
Chip Resistor
Tape & Reel Packaging
Tape Type
(P=Paper, E=Plastic)
Tolerance
J=±5%, G=±2%, F=±1, D=±0.5%
Ordering Data
Sample Part Number: WCR - WCR1206LF - 1001 - F - P - LT
Model
WCR0402LF, WCR0603LF, WCR0805LF, WCR1206LF,
WCR1210LF, WCR2010LF, WCR2512LF
Resistance
3-digit resistance code for tolerances G and J.
4-digit resistance code for tolerances F and D.
For additional information or to discuss your specific requirements,
please contact our Applications Team using the contact details below.
Power Derating Chart
Temperature in °C
% Rated Power