Resistors
Ultra Precision Metal Film Resistors
CAR series
Tolerance down to 0.01%
Low TCR’s
High reliability
Superior moisture performance
Non standard values available
Higheststabilitymetallmavailable
Matched sets and networks
Ultra Precision
Metal Film Resistors
CAR series
•Tolerance down to 0.01%
•Low TCR’s
•High reliability
•Superior moisture performance
•Non standard values available
•Highest stability metal film available
•Matched sets and networks
Tolerance
TCR CAR5 CAR6 CAR7
ppm/°C 0.01-0.02% 0.05% 0.1-1% 0.01/0.02% 0.05% 0.1-1% 0.01-0.02% 0.05% 0.1-1%
5 50 to 300k 10 to 500k 10 to 500k 50 to 500k 10 to 500k 10 to 500k 50 to 750k 10 to 750k 10 to 750k
10 50 to 300k 10 to 1M 10 to 1M 50 to 500k 10 to 1M 10 to 1M 50 to 750k 10 to 1M 10 to 1.5M
15 50 to 300k 10 to 1M 10 to 1M 50 to 500k 10 to 1M 10 to 1M 50 to 750k 10 to 1M 10 to 3.5M
25 50 to 300k 10 to 1M 10 to 1.5M 50 to 500k 10 to 1M 10 to 3M 50 to 750k 10 to 1M 10 to 5M
50 50 to 300k 10 to 1M 10 to 3M 50 to 500k 10 to 1M 10 to 5M 50 to 750k 10 to 1M 10 to 10M
Dimensions (mm) and Weight (g)
PCB Min
mounting Bend Wt.
Type L Max D Max f min d nom. centres Radius nom.
CAR5 7.2 2.5 30 0.6 10.2 0.6 0.24
CAR6 10.0 3.7 30 0.6 12.7 0.6 0.40
CAR7 15.5 5.5 30 0.8 18.4 1.2 1.15
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
CAR5 CAR6 CAR7 Notes
Power rating at 70°C watts 0.25 0.33 0.5
Power rating at 85°C watts 0.125 0.25 0.33
Resistance range ohms 10R0 to 3M 10R0 to 5M 10R0 to 10M
Limiting element voltage volts 250 350 500
TCR (20 to +70°C)
Resistance tolerance %
0.01, 0.02, 0.05, 0.1, 0.25, 0.5 & 1
combinations
Standard values E24, E96 preferred below
Thermal impedance °C/watt 110 70 60
Ambient temperature range
Note1: Based on sampling. 100% screened product is available.
°C -55 to +155
Electrical Data
Table of Resistance Restrictions
Physical Data
A subsidiary of
TT electronics plc
Welwyn Components
178
L
Df
d
1
ppm/°C 5, 10, 15, 25, 50 See tolerance/TCR
Ultra Precision
Metal Film Resistors
CAR series
•Tolerance down to 0.01%
•Low TCR’s
•High reliability
•Superior moisture performance
•Non standard values available
•Highest stability metal film available
•Matched sets and networks
Tolerance
TCR CAR5 CAR6 CAR7
ppm/°C 0.01-0.02% 0.05% 0.1-1% 0.01/0.02% 0.05% 0.1-1% 0.01-0.02% 0.05% 0.1-1%
5 50 to 300k 10 to 500k 10 to 500k 50 to 500k 10 to 500k 10 to 500k 50 to 750k 10 to 750k 10 to 750k
10 50 to 300k 10 to 1M 10 to 1M 50 to 500k 10 to 1M 10 to 1M 50 to 750k 10 to 1M 10 to 1.5M
15 50 to 300k 10 to 1M 10 to 1M 50 to 500k 10 to 1M 10 to 1M 50 to 750k 10 to 1M 10 to 3.5M
25 50 to 300k 10 to 1M 10 to 1.5M 50 to 500k 10 to 1M 10 to 3M 50 to 750k 10 to 1M 10 to 5M
50 50 to 300k 10 to 1M 10 to 3M 50 to 500k 10 to 1M 10 to 5M 50 to 750k 10 to 1M 10 to 10M
Dimensions (mm) and Weight (g)
PCB Min
mounting Bend Wt.
Type L Max D Max f min d nom. centres Radius nom.
CAR5 7.2 2.5 30 0.6 10.2 0.6 0.24
CAR6 10.0 3.7 30 0.6 12.7 0.6 0.40
CAR7 15.5 5.5 30 0.8 18.4 1.2 1.15
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
CAR5 CAR6 CAR7 Notes
Power rating at 70°C watts 0.25 0.33 0.5
Power rating at 85°C watts 0.125 0.25 0.33
Resistance range ohms 10R0 to 3M 10R0 to 5M 10R0 to 10M
Limiting element voltage volts 250 350 500
TCR (20 to +70°C)
Resistance tolerance %
0.01, 0.02, 0.05, 0.1, 0.25, 0.5 & 1
combinations
Standard values E24, E96 preferred below
Thermal impedance °C/watt 110 70 60
Ambient temperature range
Note1: Based on sampling. 100% screened product is available.
°C -55 to +155
Electrical Data
Table of Resistance Restrictions
Physical Data
A subsidiary of
TT electronics plc
Welwyn Components
178
L
Df
d
1
ppm/°C 5, 10, 15, 25, 50 See tolerance/TCR
10.19
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
AllPb-freepartscomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)AllPb-freepartscomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)
Ultra Precision Metal Film Resistors
CAR series
Figure 1
Construction
Ceramic rods are coated with a metal film and plated steel
caps are force fitted. A helical cut is used to adjust the film to
its final value.
Termination wires are welded to the caps and the resistor is
protected with a specially formulated epoxy coating.
Terminations
Material Solderable finish copper wire.
Strength The terminations meet the requirements of
IEC 68.2.21
Solderability The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
Ultra Precision
Metal Film Resistors
CAR 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
179
Welwyn Components
Values 10 ≤250k Values > 250k
Actual Performance Actual Performance
Maximum Typical Maximum Typical
Load at rated power : 1000 hrs at 70°C (or 85°C) ∆R % 0.05 0.02 0.25 0.05
Shelf life : 12 months at room temperature ∆R %
C°551 ta oreZC°551 ta oreZ)C°58 ro( C°07 ta rewop detar morf gnitareD
Short term overload ∆R % 0.01 0.001 0.08 0.01
Climatic ∆R % 0.05 0.02 0.2 0.05
65/551/5565/551/55yrogetac citamilC
Long term damp heat ∆R % 0.05 0.02 0.2 0.05
Temperature rapid change ∆R % 0.04 0.02 0.25 0.05
Resistance to solder heat ∆R % 0.02 0.003 0.05 0.005
Vibration and bump ∆R % 0.02 0.002 0.06 0.02
1.0130.02.0V/Vµ)ycneuqerf fo edaced a ni( esioN
50.0<2.050.0<3.0V/mppecnatsiser fo tneiciffeoc egatloV
Marking
Type reference, TCR code, resistance value and tolerance
code.
The resistance value marking conforms to IEC 62.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning fluids suitable for printed circuits.
Performance Data
Application Notes
Matched Sets
Resistors can be supplied matched for tolerance and TCR
down to ±0.005% and ±1ppm/°C respectively.
52
f1f2
66
5
Body location f 1 – f 2≤ 1.4 mm
Dry heat : 1000 hrs at 155°C ∆
Load at rated power : 8000 hrs at 70°C (or 85°C) ∆
R %
R % 0.1 0.04 0.5 0.1
0.15 0.08 1 0.2
0.01 0.003 0.04 0.02
10.19
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Figure 1
Construction
Ceramic rods are coated with a metal film and plated steel
caps are force fitted. A helical cut is used to adjust the film to
its final value.
Termination wires are welded to the caps and the resistor is
protected with a specially formulated epoxy coating.
Terminations
Material Solderable finish copper wire.
Strength The terminations meet the requirements of
IEC 68.2.21
Solderability The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
Ultra Precision
Metal Film Resistors
CAR 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
179
Welwyn Components
Values 10 ≤250k Values > 250k
Actual Performance Actual Performance
Maximum Typical Maximum Typical
Load at rated power : 1000 hrs at 70°C (or 85°C) ∆R % 0.05 0.02 0.25 0.05
Shelf life : 12 months at room temperature ∆R %
C°551 ta oreZC°551 ta oreZ)C°58 ro( C°07 ta rewop detar morf gnitareD
Short term overload ∆R % 0.01 0.001 0.08 0.01
Climatic ∆R % 0.05 0.02 0.2 0.05
65/551/5565/551/55yrogetac citamilC
Long term damp heat ∆R % 0.05 0.02 0.2 0.05
Temperature rapid change ∆R % 0.04 0.02 0.25 0.05
Resistance to solder heat ∆R % 0.02 0.003 0.05 0.005
Vibration and bump ∆R % 0.02 0.002 0.06 0.02
1.0130.02.0V/Vµ)ycneuqerf fo edaced a ni( esioN
50.0<2.050.0<3.0V/mppecnatsiser fo tneiciffeoc egatloV
Marking
Type reference, TCR code, resistance value and tolerance
code.
The resistance value marking conforms to IEC 62.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning fluids suitable for printed circuits.
Performance Data
Application Notes
Matched Sets
Resistors can be supplied matched for tolerance and TCR
down to ±0.005% and ±1ppm/°C respectively.
52
f1f2
66
5
Body location f 1 – f 2≤ 1.4 mm
Dry heat : 1000 hrs at 155°C ∆
Load at rated power : 8000 hrs at 70°C (or 85°C) ∆
R %
R % 0.1 0.04 0.5 0.1
0.15 0.08 1 0.2
0.01 0.003 0.04 0.02
Figure 1
Construction
Ceramic rods are coated with a metal film and plated steel
caps are force fitted. A helical cut is used to adjust the film to
its final value.
Termination wires are welded to the caps and the resistor is
protected with a specially formulated epoxy coating.
Terminations
Material Solderable finish copper wire.
Strength The terminations meet the requirements of
IEC 68.2.21
Solderability The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
Ultra Precision
Metal Film Resistors
CAR 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
179
Welwyn Components
Values 10 ≤250k Values > 250k
Actual Performance Actual Performance
Maximum Typical Maximum Typical
Load at rated power : 1000 hrs at 70°C (or 85°C) ∆R % 0.05 0.02 0.25 0.05
Shelf life : 12 months at room temperature ∆R %
C°551 ta oreZC°551 ta oreZ)C°58 ro( C°07 ta rewop detar morf gnitareD
Short term overload ∆R % 0.01 0.001 0.08 0.01
Climatic ∆R % 0.05 0.02 0.2 0.05
65/551/5565/551/55yrogetac citamilC
Long term damp heat ∆R % 0.05 0.02 0.2 0.05
Temperature rapid change ∆R % 0.04 0.02 0.25 0.05
Resistance to solder heat ∆R % 0.02 0.003 0.05 0.005
Vibration and bump ∆R % 0.02 0.002 0.06 0.02
1.0130.02.0V/Vµ)ycneuqerf fo edaced a ni( esioN
50.0<2.050.0<3.0V/mppecnatsiser fo tneiciffeoc egatloV
Marking
Type reference, TCR code, resistance value and tolerance
code.
The resistance value marking conforms to IEC 62.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning fluids suitable for printed circuits.
Performance Data
Application Notes
Matched Sets
Resistors can be supplied matched for tolerance and TCR
down to ±0.005% and ±1ppm/°C respectively.
52
f1f2
66
5
Body location f 1 – f 2≤ 1.4 mm
Dry heat : 1000 hrs at 155°C ∆
Load at rated power : 8000 hrs at 70°C (or 85°C) ∆
R %
R % 0.1 0.04 0.5 0.1
0.15 0.08 1 0.2
0.01 0.003 0.04 0.02
CAR5 and CAR6 standard packing is in tape, as
shown below, whilst CAR7 is bulk packed.
Packaging
CAR series
Ordering Procedure
This product has two valid part numbers:
European (Welwyn) Part Number: CAR5V-31K6PI (CAR5 with TCR ±5ppm/°C at 31.6 kilohms ±0.02%, Pb-free)
C
A
R
5
V
-
3
1
6
P
I
1
2
3
4
5
USA (IRC) Part Number: CAR5LFV3162PA (CAR5 with TCR ±5ppm/°C at 31.6 kilohms ±0.02%, Pb-free)
C
A
R
5
L
F
V
3
6
2
P
A
1
2
3
4
5
6
1
2
3
4
5
Type TCR (ppm/°C) ValueTolerance Finish, Screening & Packing
CAR5
V = ±5
E24 = 3/4 characters
E96 = 4/5 characters
R = ohms
K = kilohms
M = megohms
L = ±0.01%
CAR6
T = ±10
P = ±0.02%
CAR7
Y = ±15
W = ±0.05%
D = ±25
B = ±0.1%
C = ±50
C = ±0.25%
D = ±0.5%
F = ±1%
1
2
3
4
5
6
Type Termination TCR (ppm/°C) ValueTolerance Packing
CAR5
Omit for SnPb
V = ±5
3 digits + multiplier
L = ±0.01%
CAR6
LF = Pb-free
T = ±10
R = ohms for
values <100 ohms
P = ±0.02%
CAR7
Y = ±15
W = ±0.05%
D = ±25
B = ±0.1%
C = ±50
C = ±0.25%
D = ±0.5%
F = ±1%
SC = Standard packing & Pb-free
with 5ppm/°C screened
PB = Standard packing & SnPb
CAR5
CAR7 Bulk 250/box
Ammo Up to 5000/box
CAR6 Ammo Up to 2500/box
I = Standard packing & Pb-free
A
B
CAR5
CAR7 Bulk 250/box
Ammo up to 5000/box
CAR6 Ammo up to 2500/box
10.19
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Ultra Precision Metal Film Resistors