General Purpose Surface
Resistors
Mounted Resistors
General Purpose Surface
Mounted Resistors
General Purpose Surface
WCR Series
Mounted Resistors
Excellent reliability
WCR Series
Excellent reliability
WCR Series
Wrap around terminations
Wide range of sizes and ohmic values
Inner electrode protection
Excellent reliability
Wrap
range of sizes and ohmic values
Wide
around terminations
Inner electrode protection
Wrap around terminations
Inner electrode protection
AEC-Q200 grade available
Wide range of sizes and ohmic values
Welwyn Components
Welwyn Components
Electrical Data
Electrical
rating @ 70°C
Data
Power
All parts are Pb-free and comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
0201
0402
0603
0805
1206
1210
2010
2512
0.1
0.125
0.25
0.5
1.0
0.05
0.25
0.063
watts
Resistance range
ohms 10R to 1M0 1R0 to 1M0
1R0 to 10M
0603
0805
1206
2010
2512
1210
0402
0201
150
25
50
75
Limiting element votage
volts
200
0.1
0.125
0.25
0.5
1.0
0.05
0.063
Power ratingTCR*
@ 70°C
watts
100 0.25
200
250
ppm/°C
Resistance range
ohms 10R to 1M0 1R0 to 1M0
1R0 to 10M
1
Resistance Tolerance
%
150
25
50
75
Limiting element votage
volts
200
E24 or E96
Standard values
100
200
250
TCR*
ppm/°C
-55 to 155
Ambient temperature range
°C
1
Resistance Tolerance Jumper Chip Rating %
Zero-ohm
amps
1.5
2
0.5
1
E24 or E96
Standard values
<50
Zero-ohm Jumper Chip Resistance milliohms
-55 to 155
Ambient temperature range
°C
* Notes – TCR for low values 1R to 10R: -400 to +600ppm/ºC, 11R to 100R: ±200ppm/ºC
Zero-ohm Jumper Chip Rating
amps
1.5
2
0.5
1
TCR for high values 3M3 to 10M: ±300ppm/º
<50
Zero-ohm Jumper Chip Resistance milliohms
Physical Data
Dimensions (mm)
Physical Data
L
Style
* 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
The chips have a high alumina substrate (96% minimum) with
a ruthenium oxide resistance element and silver palladium,
Figure
Construction
and tin plated terminations. A glazed protection coat
1
nickel
The chips have a high alumina substrate (96% minimum) with
is applied to the resistive element (See Fig.1)
a ruthenium oxide resistance element and silver palladium,
Terminations
nickel and tin plated terminations. A glazed protection coat
Solderability
The terminations meet the requirements of
is applied to the resistive element (See Fig.1)
IEC 115-1, Clause 4.17.3.2.
Terminations
Strength
The terminations meet requirements of
Solderability
The terminations meet the requirements of
IEC 68.2.21.
IEC 115-1, Clause 4.17.3.2.
Strength
The terminations meet requirements of
IEC 68.2.21.
General Note
T
C
A
W
0.6 ± 0.03
0.23 ± 0.03
0.12 ± 0.05
0.15 ± 0.05
0.3 ± 0.03
0201
Dimensions (mm)
1.0 ± 0.1
0.35 ± 0.05
0.2 ± 0.1
0.25 ± 0.1
0.5 ± 0.05
0402
L
T
C
1.6 ± 0.15
0.5 ± 0.15
0.25 ±A
0.2
0.25 ± 0.2
W
Style
0.8 ± 0.15
0603
C
A
0.6 ± 0.03
0.23 ± 0.03
0.12 ± 0.05
0.15 ± 0.05
2.0 ± ± 0.03 1.25+ 0.2 -0.1 0.5 + 0.15 -0.10
0.4 ± 0.2
0.4 ± 0.2
0.3 0.2
0201
0805
1.0 ± 0.1
0.35 -0.15
0.2 ± -0.1
0.25 ± 0.1
L
3.2 +0.1±-0.25 1.6 + 0.1 ± 0.05 0.55 +0.150.1 0.5 + 0.2-0.25 0.5+ 0.2 -0.25
0.5 0.05
0402
1206
W
A T
1.6 ± 0.15 3.2 0.8 ± 0.15
0.50.15
± 0.15 0.550.25 ± 0.2
0.25 ± 0.2
+ 0.1 -0.2
+0.15 -0.1
0.5 ± 0.25
0.5 ± 0.2
0603
2.6 ±
1210
A
Wrap-around terminations
2.0 ± 0.2
0.4 0.15
0.4 ± 0.2
5.0 ± 0.15 -0.1 0.5 + 0.15 -0.10 0.56 ± ± 0.2
0.60 ± 0.25
0.60 ± 0.25
1.25+ 0.2
0805
2.5 ± 0.15
2010
(3 faces)
L
3.2 +0.1 -0.25 1.6 + 0.1 -0.15 0.55 +0.15 -0.1 0.56+ 0.2-0.25 0.60 ±0.2 -0.25 1.2 ± 0.85
0.5 ± 0.15
0.5+ 0.25
6.3 ± 0.15
1206
3.2 ± 0.15
W
2512
A
3.2 + 0.1 -0.2
0.55 +0.15 -0.1
0.5 ± 0.25
0.5 ± 0.2
2.6 ± 0.15
1210
Wrap-around terminations
5.0 ± 0.15
0.56 ± 0.15
0.60 ± 0.25
0.60 ± 0.25
2.5 ± 0.15
2010
Figure 1
(3 faces)
Construction
± 0.15
6.3 ± 0.15
0.56 ± 0.15
0.60 ± 0.25
1.2 ± 0.85
3.2
2512
C
T
Tin Plating
Epoxy Melamine
Protection
Nickel Barrier
Glass Dielectric
Silver
Dipped Conductor
Resistance Element
Palladium
Epoxy Melamine
Protection
Glass Dielectric
Silver
Resistance Element
Palladium
96% min Alumina Substrate
96% min Alumina Substrate
Tin Plating
Nickel Barrier
Dipped Conductor
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.
General
Note
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
General
Note
Welwyn Components
the right to make changes in
changes
specification
specification without notice or liability.
Telephone: +44 (0) 1670 make
product
in product
without notice or
Email:
TT Electronics reserves
reserves the right to 822181 · Facsimile: +44 (0) 1670 829465 ·
liability.
info@welwyn-tt.com · Website: www.welwyn-tt.com
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
Iss 07.03
A subsidiary of
TT electronics plc
www.ttelectronics.com/resistors
Iss 07.03
06.18
A subsidiary of
TT electronics plc
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT Electronics plc
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
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
300
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 @ 155 °C
R%
R%
R%
R%
R%
All chips in 1210 size and smaller are tape mounted and supplied on standard 8mm paper tape, 2010 size on 12mm paper
All chips are tape mounted and supplied on standard 8mm
tape or plastic tape, and 2512 size on 12mm plastic tape reel, as
Chip
publication 286-3.
For Designers
IEC
Resistor Labstock
tape reel, as IEC publication 286-3.
WCR chip resistors are available in a special package of the most
180mm (7 inch) reel is standard
180mm (7 inch) reel is standard carries 5,000 pieces.
popular sizes containing 50 each of the E24 values.
250mm (10 inch) reel carrying double the standard quantity
(Except 0402 carries 10,000 pieces)
Please contact the sales desk for full details of this excellent
can be supplied by agreement.
Packaging
Packaging
Note: For zero ohm jumper chips use the dummy value & tolerance code
R005J
General Note
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own
+44 (0)
is considered accurate
info@welwyn-tt.com ·
Telephone: +44 (0) 1670 822181 · Facsimile:
data and
1670 829465 · Email:
at time of going to print.
Website: www.welwyn-tt.com
BI Technologies IRC Welwyn
Issue D ·
01.11
07.03
www.ttelectronics.com/resistors
© TT Electronics plc
06.18
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
1
E24 = 3 characters
E96 = 4 characters
R = ohms
K = kilohms
M = megohms
0
6
-
1
0
3
4
Tolerance
1
F = ±1%
K
F
4
I
5
5
Grade / Packing
I = Standard
A = AEC-Q200 grade
2
Both grades use standard
packing as follows:
0201
0402
0603, 0805,
1206, 1210
2010, 2512
20000/reel
10000/reel
5000/reel
4000/reel
WCR 0201
0402
0603
0805
1206
1210
2010
2512
Note 1: For zero ohm jumper chips use the dummy value & tolerance code
R005J
Note 2: AEC-Q200 grade on resistor chips is not available in 0201 size.
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.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
06.18
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