General Purpose Surface
Mounted Resistors
WCR Series
Welwyn Components
•
Excellent reliability
•
Wide range of sizes and ohmic values
•
Wrap around terminations
•
Inner electrode protection
Electrical Data
½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½
Resistance range
½½½½½½½½½½½½½½½½
Limiting element voltage
½½½½½½½½½½½½½½½½½½½½½½½
TCR
½½½
Resistance tolerance
½½½½½½½½½½½½½½½½½½½½
Standard values
½½½½½½½½½½½½½½½
Ambient temperature range
˚C
½½½½½½½½½½½½½½½½½½½½½½½½½
½½
Zero Ohm Jumper Chip Rating
A
½½½½½½½½½½½½½½½½½½½½½½½½½½
½
Zero Ohm Jumper Chip Resistance
mOhms
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
½½½½½
Power rating at 70˚ C
0402
0603
1206
2010
½½½½
2512
½½½½
½½½½
0805
½½½½
½½½½
½½½½
½½½½
½½½½
watts
0.063
0.1
0.125
0.25
0.5
1.0
½½½½½
½½½½
½½½½½
½½½
½½½½½
½½½½
½½½½
½½½
½½½
ohms
4R7 to 2M2
½½½½½½½½½½ ½½½½½½½½½
to
½½½½½½½½½
1R to 22M
1R to 22M
1R 22M
1R to 10M
1R to 10M
½½½½½½½½½
½½½½½½½½½ ½½½½½½½½½ ½½½½½½½½½
½½½½ ½½½½½½½½½
volts
50
50
150
200
200
200
½½½½½
½½
½½
½½
½½½
½½½
½½½
½½½
½½½
ppm/˚ C
see table below
½½½½½½½½½½½½½½½
½½½½½½
%
see table below
½½½½½½½½½½½½½½½
½
E24 / E96 preferred. Other values to special order
1
<50
½½½
½½½
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
-55 to 155
½½½½½½½½½½
1
1.5
2
2
½
½
½½½
½
½
½
<50
<50
<50
<50
½½½
½½½
½½½
½½½
½½½
½½½
Tolerance/Resistance/TCR
½½½½½½½½½½½½½½½½½½½½½½½½½½½½
½½½½½
1206@
1
/
4
W
WCR 2010
WCR 2512
WCR 0402
WCR 0603
WCR 0805
WCR
½½½½
½½½½
Ohmic
½½½½
½½½½½½½½½½½
TCR
½½½½½½½½½½½
Tolerance
Ohmic
TCR
Ohmic
TCR
TCR
Ohmic
TCR
Ohmic TCR
Ohmic
Range
ppm
ppm
Range
½½½½½½½½½½½½½½½½½½½½½
ppm
Range
ppm
Range ppm
½½½½½½½½½½½½½½½½½½½½½
Range
ppm
½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½
Range
½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½
(Ohms)
/˚ C
(Ohms)
½½½½½½½½½½½½½½½½½½½½½½
/˚C *
(Ohms)
½½½½½½½½½½½½½½½½½½½½½½
/˚C *
(Ohms)
/˚C *
(Ohms) /˚C *
½½½½½½½½½½½½½½½½½½½½½½
(Ohms)
/˚C*
½½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½½
MIN
½½½½½½½½½½½½½½½½½½½½½½½½½
MAX
MAX
MIN
MIN MAX
½½½½½½½½½½½½½½½½½½½½½½½½½
MIN MAX
½½½½½½½½½½½½½½½½½½½½½½½½½
MIN MAX
MIN MAX
½½½½½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½
½½½½½½½½
½½½½½½½½
± 0.5%
100R
½½½½½½½½
100K ±50 100R 100K ±50 100R 100K
½½½½½½½½
±100
½½½½½½
½½½½½½½½½½½½½½½½½½½
± 1%
10R 1MO ±100
1R
10M ±100
1R
10M
½½½½½½½½½½½½½½½½½½½
±100 1R0 9R1
-100 to +600
±100 10R
1M
1R
10M ±300
½½½½
½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½
±100
½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½
±200 10R 1M0
± 2%
10R
1M ±200
1R
10M ±200
1R
10M ±200 10R
1M
10R
1M ±200
½½½½
½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½
± 5%
4R7 2M2 ±300
1R
10M ±200
1R
10M ±200 10R
1M ±200 1M0 10M
±300
1R
10M ±300
½½½½
½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½
± 10%
11M 22M ±300 11M 22M ±300
½½½½½
½½½½½½½½½½½½½½½½½½½½
Physical Data
½½½½½½½½½½½½½½½
½½½½½½½½½½½½½
* Notes – TCR for
TCR for low values 1R to 4R3 -100 to +600 ppm/˚C.
±200ppm/ºC
*Note:
low values 1R to 10R: -400 to +600ppm/ºC, 11R to 100R:
TCR for high values 3M3 to 22M: ±300ppm/º
TCR for high values 3M3 to 22M ± 300ppm/˚C.
½
½
½
½
½
½½½½½
Dimensions (mm)
½½½½½½½½½½
½½½½½½½½½½½
½½½½½½½½½½½
½½½½½½½½½½½
½½½½½½½½½½
½½½½
Style
L
W
T
C
A
½½½½½½½½½½
½½½½½½½½½½½
½½½½½½½½½
½½½½½½½½½½
½½½½½½½½½½
½½½½
½½½½½½½½½½
½½½½½½½½½½
½½½½½½½½½½
½½½½½½½½½½
0.1
½½½½½½½½½½
½½½½
0402
1.0 ± 0.05
0.5 ± 0.03
0.35 ± 0.05
0.20 ± 0.1
0.25 ±
½½½½½½½½½
½½½½½½½½½½½½½½½½
½½½½½½½½½
½½½½½½½½½½½½½½
0.5 + 0.15 -0.05
½½½½½½½½½
½½½½
0603
1.6 ± 0.15
0.8 ± 0.15
0.25 ± 0.2
0.25 ± 0.2
½½½½½½½½½½½½½½ ½½½½½½½½½½½½½½½ ½½½½½½½½½½½½½½½ ½½½½½½½½½½½½½½ ½½½½½½½½½½½½½½
½½½½
0805
2.0 + 0.2
0.4 ± 0.2
0.4 ±
½½½½½½½½½½½½½½
1.25 + 0.2 -0.1 0.5 + 0.15 -0.10
½½½½½½½½½½
½½½½½½½½½½½½½½½
½½½½½½½½½
0.2
½½½½½½½½½½
½½½½
0.5 + 0.2
1206
+ 0.1 -0.15 0.55 + 0.15 -0.05 0.5 + 0.2 -0.25
½½½½½½½½½½½
-0.25
½½½½½½½½½½
½½½½½½½½½½½
½½½½½½½½½½½
½½½½
3.2 + 0.1 -0.15 1.6
½½½½½½½½½½
½½½½½½½½½½
½½½½½½½½½½½
½½½½½½½½½½½
½½½½½½½½½½
½½½½
2010
5.0 ± 0.15
2.5 ± 0.15
0.56 ± 0.15
0.60 ± 0.25
½½½½½½½½½½½
0.60 ± 0.25
½
C
½
½
A
½
½
½
T
2512
6.3 ± 0.15
3.2 ± 0.15
0.56 ± 0.15
0.60 ± 0.25
0.60 ± 0.25
L
½½½½½½½½½½½½½½½½½½½½½½½½
W
A
½½½½½½½½½
Wrap-around terminations
(3 faces)
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.
A subsidiary of
TT electronics plc
Iss 07.03
© 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
15
General Purpose Surface
Mounted Resistors
WCR Series
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)
Figure 1
Welwyn Components
Tin Plating
Nickel Barrier
Dipped Conductor
Silver
Palladium
Epoxy Melamine
Protection
Glass Dielectric
Resistance Element
Terminations
Solderability
Strength
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2.
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.
96% min Alumina Substrate
Table 1
Resistance
value ohms
100R
>100R, 10K
>10K, 100K
>100K, 1M0
>1M0
Noise
dB
-10
0
+15
+20
+30
Solvent Resistance
The protective epoxy lacquer and marking are resistant to all
normal industrial cleaning fluids suitable for printed circuits.
Performance Data
Maximum Change
0201
Load: 1000 hrs at 70°C
Shelf life: 12 months at room temp.
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
Insulation resistance
Voltage proof
ohms
volts
100
500
500
>100K : 2
0402
>100K : 2
0.2
2
100
3
0603
>100K : 2
0.2
2.5
100
3
0805
>100K : 2
0.2
2.5
200
3
1206
>100K : 2
0.2
2.5
400
3
1210
2010
2512
3% + 0.1R
0.2
5
400
3
R%
10R-100K : 1 4R7-100K : 1 1R-100K : 1 1R-100K : 1 1R-100K : 1
R%
R%
volts
0.2
2
50
3
1R-100K : 1 1R-100K : 1
>100K : 2
>100K : 2
0.2
2.5
400
3
0.2
2.5
400
3
zero @ 125 °C
R%
R%
R%
R%
R%
55/125/56
<1% tol: 1, >2% tol: 3
1
2.5
1
1
2.5
1
1
2.5
1
1
2.5
1
see table 1
> 1G
500
500
500
500
1
2.5
1
1
2.5
1
1
2.5
1
1
2.5
1
Packaging
Packaging
All chips are tape mounted and supplied on standard 8mm
All chips are tape mounted and supplied on standard 8mm
tape reel, as IEC publication 286-3.
tape reel, as IEC publication 286-3.
180mm (7 inch) reel is standard
180mm (7 inch) reel iscarrying double the standard quantity
250mm (10 inch) reel standard carries 5,000 pieces.
(Except 0402 carries 10,000 pieces)
can be supplied by agreement.
250mm (10 inch) reel carrying double the standard quantity
can be supplied by agreement.
Chip Resistor Labstock For Designers
Chip Resistor Labstock For Designers
WCR chip resistors are available in a special package of the most
WCR chip resistors are available in a special package of the most
popular sizes containing 50 each of the E24 values.
popular sizes containing 50 each of the E24 values.
Please contact the sales desk for full details of this excellent
Please contact the sales desk for full details of this excellent
solution for designers and your prototype build requirements.
solution for designers and your prototype build requirements.
Note: For zero ohm jumper chips use the dummy value & tolerance code
R005J
© 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 ·
05.08
07.03
