General Purpose Surface
General
Purpose Surface
Purpose Surface
Mounted Resistors
Mounted
Resistors
Resistors
WCR
WCR Series
Series
WCR Series
Excellent reliability
Excellent reliability
Excellent
range of sizes
ohmic values
Wide
Wide
reliability
and ohmic values
range of sizes and
Wide Wrap around terminations
Wrap
range of
terminations
around
sizes and ohmic values
Inner
around terminations
electrode protection
Wrap Inner electrode protection
Welwyn Components
Welwyn Components
·
·
·
·
Inner electrode protection
Electrical Data
Electrical Data
0603
0805
1206
2010
2512
1210
0402
0201
0603
0.1
0805
0.125
1206
0.25
2010
0.5
2512
1.0
1210
0.25
0402
0.063
0201
0.05
Power rating @ 70C
watts
Resistance range
1R0 to 10M 0.5
0.1
0.125
0.25
1.0
0.05
0.25
0.063
Power rating @ 70
C
watts ohms 10R to 1M0 1R0 to 1M0
Limiting element votage
volts
Resistance range
ohms 10R to 1M0 1R0 to 1M0
150 1R0 to 10M
25
50
200
200
250
TCR*
Limiting element votage
voltsppm/C
150 100
25
50
200
1
%
100
200
250
TCR* Resistance Tolerance
ppm/C
Standard values
1 E24 or E96
Resistance Tolerance
%
-55
Ambient
C
E24 or E96 to 155
Standard values temperature range
Zero-ohm Jumper Chip
2
0.5
1
-55 to 1.5
155
Ambient temperature range Rating
C
amps
<50
Zero-ohm Chip Rating
Zero-ohm Jumper Jumper Chip Resistance milliohms
amps
1.5
2
0.5
1
Zero-ohm Jumper Chip Resistance milliohms
* Notes – TCR for low values
<50
10R: -400 to +600ppm/ºC, 11R to 100R: ±200ppm/ºC
1R to
TCR for high values 3M3 to 10M: ±300ppm/º
* Notes – TCR for low values 1R to 10R: -400 to +600ppm/ºC, 11R to 100R: ±200ppm/ºC
TCR for high values 3M3 to 10M: ±300ppm/º
Physical Data
Physical Data
Dimensions (mm)
L
T
C
A
Dimensions (mm)
W
Style
0.6 ± 0.03 W 0.3 ± 0.03 T 0.23 ± 0.03 C 0.12 ± 0.05 A 0.15 ± 0.05
0201
L
Style
1.0
0.35 0.12
0.2
0.25
0.5
0402
± 0.03 ± 0.05 ± 0.03 ± 0.03 ± 0.03 ± 0.05 ± 0.05 ± 0.1 ± 0.05 ± 0.1
0.6
0.23
0.15
0.3
0201
1.6
0.5
0.25 ± 0.2 ± 0.1
0.25 ± 0.2
0.8
0603
± 0.05 ± 0.15 ± 0.03 ± 0.15 ± 0.05 ± 0.15 ± 0.1
1.0
0.35
0.2
0.25
0.5
0402
2.0 ± 0.2 ± 0.15 0.2 -0.1± 0.5 + 0.15 0.25 ± 0.2 ± 0.2
-0.10
0.4
0.4
0805
± 0.15
1.6
0.5 0.15
0.25 ± 0.2 ± 0.2
0.8 1.25+
0603
3.2
-0.25 1.6 + 0.5 + 0.15 -0.10
-0.1 0.5
1206
2.0 ± 0.2 +0.11.25+ 0.2 -0.10.1 -0.15 0.55 +0.150.4 ± 0.2 + 0.2-0.25 ± 0.2 0.2 -0.25
0.4 0.5+
0805
0.55 +0.15 + 0.2-0.25 ± 0.25 0.2 -0.25 ± 0.2
0.5 0.5+
0.5
2.6 0.15
1210
+0.1 3.2 + 0.1 -0.20.1 -0.15± 0.55 +0.15 -0.1 0.5-0.1
3.2
-0.25 1.6 +
1206
5.0 ± 0.15 ± 0.15 ± 0.55 +0.150.56 ± 0.15 ± 0.25 ± 0.25 ± 0.2
0.60
0.60 ± 0.25
2.5 0.15
2010
+ 0.1 -0.2
3.2
-0.1
0.5
0.5
2.6
1210
6.3
0.56 0.60
0.60
0.60
3.2
2512
± 0.15 ± 0.15 ± 0.15 ± 0.15 ± 0.15 ± 0.15 ± 0.25 ± 0.25 ± 0.25 ± 0.25
5.0
0.56
0.60
2.5
2010
2512
6.3 ± 0.15
3.2 ± 0.15
0.56 ± 0.15
0.60 ± 0.25
0.60 ± 0.25
C
C
A
A
L
L
A
T
W
T
W
A
Wrap-around terminations
(3 faces)
Wrap-around terminations
(3 faces)
Figure 1
Construction
The chips
Construction
have a high alumina substrate (96% minimum) with
Figure 1
a have a high alumina substrate (96% minimum) with
The chipsruthenium oxide resistance element and silver palladium,
nickel and resistance element and silver palladium,
a ruthenium oxidetin plated terminations. A glazed protection coat
is applied to terminations. A glazed protection coat
nickel and tin platedthe resistive element (See Fig.1)
is applied to the resistive element (See Fig.1)
Terminations
Solderability
The terminations meet the requirements of
Terminations
IEC 115-1, Clause 4.17.3.2.
Solderability
The terminations meet the requirements of
Strength
IEC 115-1, Clause 4.17.3.2. requirements of
The terminations meet
Strength
The terminations meet requirements of
IEC 68.2.21.
IEC 68.2.21.
Tin Plating
Nickel Barrier
Tin Plating
Dipped Conductor
Nickel Barrier
Dipped Conductor
Epoxy Melamine
Protection
Glass Dielectric
Epoxy Melamine
Protection
Silver
Resistance Element
Silver Palladium Glass Dielectric
Resistance Element
Palladium
96% min Alumina Substrate
96% min Alumina Substrate
General Note
General
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
General
Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
A subsidiary of
Welwyn Components reserves the right to make changes in product specification without notice or liability.
TT electronics reserves the right to make changes in product specification without notice or liability.
TT electronics plc
A subsidiary of
All information is subject
Components Limited
is· considered accurate at time of going to print.
© Welwyn
to Welwyn’s own data and Bedlington, Northumberland NE22 7AA,
to
All information is subject to TT electronics’ own data and is considered accurate at time of going
UK
print.
TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
Iss 07.03
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT electronics plc
Iss 07.03
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
02.13
General Purpose Surface
General Purpose Surface
Mounted Resistors
Mounted Resistors
WCR Series
WCR Series
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.
Table 1
Resistance
value ohms
100R
>100R, 10K
>10K, 100K
>100K, 1M0
>1M0
Welwyn Components
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
1R-100K : 1
>100K : 2
0.2
2.5
200
3
55/125/56
1
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
1206
1R-100K : 1
>100K : 2
0.2
2.5
400
3
1210
1R-100K : 1
>100K : 2
0.2
2.5
400
3
2010
1R-100K : 1
>100K : 2
0.2
2.5
400
3
2512
3% + 0.1R
0.2
5
400
3
R%
10R-100K : 1 4R7-100K : 1 1R-100K : 1
R%
R%
volts
0.2
2
50
3
zero @ 125 °C
R%
R%
R%
R%
R%
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 is standard carries 5,000 pieces.
250mm (10 inch) reel carrying double the standard quantity
(Except 0402 carries 10,000 pieces)
can be supplied by agreement.
Packaging
Packaging
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.
Note: For zero ohm jumper chips use the dummy value & tolerance code
R005J
© Welwyn Components
General Note
1670 822181
Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0)
· Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
Issue D ·
01.11
07.03
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
02.13
General Purpose Surface
Mounted Resistors
WCR Series
Ordering Procedure
Ordering Procedure
This product has two valid part numbers:
European (Welwyn) Part Number: WCR1206-10KFI
(1206, 10 kilohms ±1%, Pb-free)
W
C
1
1
Type
2
Size
R
1
2
2
3
Value
E24 = 3 characters
E96 = 4 characters
R = ohms
K = kilohms
M = megohms
0
6
-
1
0
3
4
Tolerance
F = ±1%
K
F
4
I
5
5
Packing
I = Standard
0201
20000/reel
0402
10000/reel
0603, 0805,
5000/reel
1206, 1210
2010, 2512
4000/reel
WCR 0201
0402
0603
0805
1206
1210
2010
2512
Note: For zero ohm jumper chips use the dummy value & tolerance code
R005J
USA (IRC) Part Number: WCR-WCR1206LF-1002FPLT
(1206, 10 kilohms ±1%, Pb-free)
W
C
1
1
WCR
2
WCR
3
Size
0201
0402
0603
0805
1206
1210
2010
2512
R
-
W
C
2
4
Termination
LF = Pb-free
R
1
2
3
5
Value
3 digits + multiplier
R = ohms for values
<100 ohms
0
6
L
4
F
1
0
5
6
Tolerance
F = ±1%
0
2
F
6
P
L
7
7
Packing
PLT = Paper Tape
0201
20000/reel
0402
10000/reel
0603, 0805,
5000/reel
1206, 1210
2010
4000/reel
ELT = Plastic Tape
2512
4000/reel
T
Family Model
Note: For zero ohm jumper chips use value & tolerance code
R000J
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
02.13
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