General Purpose Surface
Mounted Resistors
WCR SERIES
● Excellent reliability
● Wide range of sizes and ohmic values
● Wrap around terminations
● Inner electrode protection
Electrical Data
0402
0603
0805
1206
2010
2512
Power rating at 70°C
Resistance range
watts
0.063
0.063
0.10
0.125
0.25
0.5
1.0
ohms 4R7 to 2M2 1R to 22M 1R to 22M 1R to 22M 1R to 22M 1R to 10M 1R to 10M
Limiting element voltage volts
50
50
150
200
see table below
see table below
200
200
TCR
ppm/°C
%
Resistance tolerance
Standard values
E24 / E96 preferred. Other values to special order
-55 to 125
Ambient temperature range °C
Tolerance/Resistance/TCR
WCR 0402
WCR 0603
WCR 0805
WCR 1206@1/8W WCR 1206@1/4W
WCR 2010
WCR 2512
Ohmic
Range
(Ohms)
TCR
ppm
/°C
Ohmic
Range
(Ohms)
TCR
ppm
Ohmic
Range
TCR
ppm
Ohmic
Range
TCR
ppm
Ohmic
Range
TCR
ppm
Ohmic
Range
TCR
ppm
Ohmic
Range
TCR
ppm
/°C*
Tolerance
/°C* (Ohms)
/°C* (Ohms)
/°C* (Ohms)
/°C* (Ohms)
/°C* (Ohms)
MIN MAX
MIN MAX
MIN MAX
MIN MAX
MIN MAX
MIN MAX
MIN MAX
100R 100K ±50 100R 100K ±50 100R 100K ±100 100R 100K ±100
± 0.5%
± 1%
10R 1MO ±100 1R 10M ±100 1R 10M ±100 1R 10M ±100 10R 1M ±100 1R 10M ±300 1R 10M ±300
10R 1M ±200 1R 10M ±200 1R 10M ±200 1R 10M ±200 10R 1M ±200 10R 1M ±200 10R 1M ±200
4R7 2M2 ±300 1R 10M ±200 1R 10M ±200 1R 10M ±200 10R 1M ±200 1R 10M ±300 1R 10M ±300
11M 22M ±300 11M 22M ±300 11M 22M ±300
± 2%
± 5%
± 10%
Zero jumper chips also available
*Note:TCR for low values 1R to 4R3 -100 to +600 ppm/°C.
TCR for high values 3M3 to 22M ± 300ppm/°C.
Physical Data
Dimensions (mm)
Style
0402
0603
L
W
T
C
A
1.0 ± 0.05 0.5 ± 0.03 0.35 ± 0.05 0.20 ± 0.1 0.25 ± 0.1
C
1.6 ± 0.15 0.8 ± 0.15 0.5 + 0.15 0.25 ± 0.2 0.25 ± 0.2
-0.05
T
A
0805
1206
2.0 + 0.2
1.25 + 0.2 0.5 + 0.15
-0.1 -0.10
0.4 ± 0.2
0.4 ± 0.2
L
W
A
3.2 + 0.1
-0.15
1.6 + 0.1 0.55 + 0.15 0.5 + 0.2
-0.15 -0.05 -0.25
0.5 + 0.2
-0.25
Wrap-around terminations
(3 faces)
2010
2512
5.0 ± 0.15 2.5 ± 0.15 0.56 ± 0.15 0.60 ± 0.25 0.60 ± 0.25
6.3 ± 0.15 3.2 ± 0.15 0.56 ± 0.15 0.60 ± 0.25 0.60 ± 0.25
*N.B. The minimum distance between the underside terminations of the WCR 1206 is 0.2mm.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk
Issue A 07/99
15