0402 0603 0805 1206 2010 2512
Power rating at 70˚ C watts 0.063 0.1 0.125 0.25 0.5 1.0
smhoegnar ecnatsiseR
4R7 to 2M2 1R to 22M 1R to 22M 1R to 22M 1R to 10M 1R to 10M
Limiting element voltage volts 50 50 150 200 200 200
woleb elbat eesC˚/mppRCT
woleb elbat ees%ecnarelot ecnatsiseR
redro laiceps ot seulav rehtO .derreferp 69E / 42Eseulav dradnatS
551 ot 55-C˚egnar erutarepmet tneibmA
Zero Ohm Jumper Chip Rating A 1 1 1.5 2 2
Zero Ohm Jumper Chip Resistance mOhms <50 <50 <50 <50 <50
General Purpose Surface
Mounted Resistors
WCR Series
•Excellent reliability
•Wide range of sizes and ohmic values
•Wrap around terminations
•Inner electrode protection
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, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
WCR 0402 WCR 0603 WCR 0805 WCR 1206@1/4W WCR 2010 WCR 2512
Tolerance Ohmic TCR Ohmic TCR Ohmic TCR Ohmic TCR Ohmic TCR Ohmic TCR
Range ppm Range ppm Range ppm Range ppm Range ppm Range ppm
(Ohms) /˚ C (Ohms) /˚C * (Ohms) /˚C * (Ohms) /˚C * (Ohms) /˚C * (Ohms) /˚C*
MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX
± 0.5% 100R 100K ±50 100R 100K ±50 100R 100K ±100
± 1% 10R 1MO ±100 1R 10M ±100 1R 10M ±100 10R 1M ±100 1R0
9R1
-100 to +600
1R 10M ±300
± 2% 10R 1M ±200 1R 10M ±200 1R 10M ±200 10R 1M ±200 10R 1M0 ±100 10R 1M ±200
± 5% 4R7 2M2 ±300 1R 10M ±200 1R 10M ±200 10R 1M ±200 1M0 10M ±300 1R 10M ±300
003±M22M11003±M22M11%01±
Electrical Data
Iss 07.03
A subsidiary of
TT electronics plc
Welwyn Components
15
*Note: TCR for low values 1R to 4R3 -100 to +600 ppm/˚C.
TCR for high values 3M3 to 22M ± 300ppm/˚C.
Tolerance/Resistance/TCR
Dimensions (mm)
Style L W T C A
0402 1.0 ± 0.05 0.5 ± 0.03 0.35 ± 0.05 0.20 ± 0.1 0.25 ± 0.1
0603 1.6 ± 0.15 0.8 ± 0.15
0.5 + 0.15 -0.05
0.25 ± 0.2 0.25 ± 0.2
0805 2.0 + 0.2 1.25 + 0.2 -0.1
0.5 + 0.15 -0.10
0.4 ± 0.2 0.4 ± 0.2
1206 3.2 + 0.1 -0.15 1.6 + 0.1 -0.15
0.55 + 0.15 -0.05
0.5 + 0.2 -0.25 0.5 + 0.2 -0.25
2010 5.0 ± 0.15 2.5 ± 0.15 0.56 ± 0.15 0.60 ± 0.25 0.60 ± 0.25
2512 6.3 ± 0.15 3.2 ± 0.15 0.56 ± 0.15 0.60 ± 0.25 0.60 ± 0.25
Physical Data
T
W
A
A
L
Wrap-around terminations
(3 faces)
C
WCR_D.qxd 7/7/03 11:42 am Page 1
* Notes – TCR for low values 1R to 10R: -400 to +600ppm/ºC, 11R to 100R: ±200ppm/ºC
TCR for high values 3M3 to 22M: ±300ppm/º
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General Purpose Surface
Mounted Resistors
WCR Series
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com Issue D · 07.03
Welwyn Components
Construction
The chips have a high alumina substrate (96% minimum) with
a ruthenium oxide resistance element and silver palladium,
nickel and tin plated terminations. A glazed protection coat
is applied to the resistive element (See Fig.1)
Terminations
Solderability The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2.
Strength The terminations meet requirements of
IEC 68.2.21.
Marking
All resistors are individually marked with 3 digits. The first two
digits are the significant figures and the third defines the
number of added zeros. Jumpers are marked 000. Types 0201
and 0402 have no marking.
E96 1% components that can not be marked with 4 digits
will be marked with a standard 3 digit code. Details can be
supplied upon request.
Solvent Resistance
The protective epoxy lacquer and marking are resistant to all
normal industrial cleaning fluids suitable for printed circuits.
Figure 1
Table 1
Packaging
All chips are tape mounted and supplied on standard 8mm
tape reel, as IEC publication 286-3.
180mm (7 inch) reel is standard carries 5,000 pieces.
(Except 0402 carries 10,000 pieces)
250mm (10 inch) reel carrying double the standard quantity
can be supplied by agreement.
Chip Resistor Labstock For Designers
WCR chip resistors are available in a special package of the most
popular sizes containing 50 each of the E24 values.
Please contact the sales desk for full details of this excellent
solution for designers and your prototype build requirements.
Tin Plating
Nickel Barrier
Dipped Conductor
Silver
Palladium
96% min Alumina Substrate
Epoxy Melamine
Glass Dielectric
Resistance Element
esioNecnatsiseR
Bdsmhoeulav
01-R001
>100R, 0K01
>10K, 51+K001
>100K, 02+0M1
03+0M1>
Packaging
All chips are tape mounted and supplied on standard 8mm
tape reel, as IEC publication 286-3.
180mm (7 inch) reel is standard
250mm (10 inch) reel carrying double the standard quantity
can be supplied by agreement.
Chip Resistor Labstock For Designers
WCR chip resistors are available in a special package of the most
popular sizes containing 50 each of the E24 values.
Please contact the sales desk for full details of this excellent
solution for designers and your prototype build requirements.
05.08
Protection
Performance Data
Load: 1000 hrs at 70°C 10R-100K : 1
>100K : 2
Shelf life: 12 months at room temp. 0.2
0201 0402 0603 0805
Maximum Change
1206 1210 2010 2512
2 2 2.5 2.5 2.5 2.5 2.5 5
33333333
11111111
2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5
11111111
50 100 100
500
200 400 400 400 400
100 500 500 500 500 500
0.2 0.2
zero @ 125 °C
55/125/56
<1% tol: 1, >2% tol: 3
see table 1
> 1G
0.20.2 0.2 0.2 0.2
R%
R%
R%
R%
R%
R%
Derate linearly to zero from 70°C
Short term overload (6.25 x rated power)
Max voltage
Climatic
Climatic Catagory
Long term damp heat
Temperature rapid change
Resistance to solder heat
Vibration and bump
Noise
ohms
volts
Insulation resistance
Voltage proof
volts
R%
R%
4R7-100K : 1
>100K : 2
1R-100K : 1
>100K : 2
1R-100K : 1
>100K : 2
1R-100K : 1
>100K : 2
1R-100K : 1
>100K : 2
1R-100K : 1
>100K : 2
3% + 0.1R
Note: For zero ohm jumper chips use the dummy value & tolerance code R005J
