Ultra Precision Bulk
Ultra Precision Bulk
Precision Bulk
Metal Film Resistors
Metal Film Resistors
Film Resistors
4800 Series
4800 Series
4800 Series
Tolerances down to 0.005%
Tolerances down to 0.005%
Tolerances down to 0.005%
below level
Current noise and
and distortion below level
Current noise
distortion
Current noise and distortion below level
of practible measurement
of practible measurement
of practible measurement
Low thermal e.m.f
Low thermal e.m.f
Low thermal e.m.f
Ideal resistor for precision instrumentation
Ideal resistor for precision instrumentation
Ideal resistor for precision instrumentation
Use
Use
bulk metal gives superior stability
of
of bulk metal gives superior stability
Use of bulk metal gives superior stability
Planar construction gives
residual
Planar construction gives low
low residual
Planar construction gives low residual
capacitance and inductance
capacitance and inductance
capacitance and inductance
Welwyn Components
Welwyn Components
·
·
·
·
·
·
Electrical Data
Electrical Data
Commercial
Commercial
Power Rating at 70°C
Power Rating at 70°C
Resistance Range
Resistance Range
Limiting element voltage
Limiting element voltage
TCR (20 to 70°C)
TCR (20 to 70°C)
Resistance tolerance
Resistance tolerance
Thermal impedance
Thermal impedance
Values
Values
Ambient temperature range
Ambient temperature range
48 02/12/32
4804
4 80 5
48 02/12/32
4804
4 80 5
watts
0.5
1.5
1
watts
0.5
1.5
1
ohms
1R0 to 100K
0R5 to 200K
R33 to 300K
ohms
1R0 to 100K
0R5 to 200K
R33 to 300K
volts
200
350
500
volts
200
350
500
ppm/°C
5
5
5
ppm/°C
5
5
5
°C/watt
°C/watt
°C
°C
250
130
130
E24 and E96 preferred
E24 and E96 preferred
-55 to 155
-55 to 155
250
80
80
Notes
Notes
See table 1 below
See table 1 below
Any value to order
Any value to order
All styles and products
All styles and products
Table 1. Resistance Range (ohms) and Tolerance (%)
Table 1. Resistance Range (ohms) and Tolerance (%)
Tolerance (code)
Tolerance (code)
0.005 (E)
0.005 (E)
0.01 (L)
0.01 (L)
0.02 (P)
0.02 (P)
0.05 (W)
0.05 (W)
0.1 (B)
0.1 (B)
0.25 (C)
0.25 (C)
0.5 (D)
0.5 (D)
1.0 (F)
1.0 (F)
4802/12/32
4802/12/32
200R to 100K
200R to 100K
100R to 100K
100R to 100K
50R to 100K
50R to 100K
25R to 100K
25R to 100K
10R to 100K
10R to 100K
5R to 100K
5R to 100K
2R to 100K
2R to 100K
1R to 100K
1R to 100K
4804
4804
100R to 200K
100R to 200K
50R to 200K
50R to 200K
25R to 200K
25R to 200K
10R to 200K
10R to 200K
5R to 200K
5R to 200K
2R to 200K
2R to 200K
10R to 200K
10R to 200K
0.5R to 200K
0.5R to 200K
4805
4805
65R to 300K
65R to 300K
33R to 300K
33R to 300K
17R to 300K
17R to 300K
8R to 300K
8R to 300K
3.3R to 300K
3.3R to 300K
1.7R to 300K
1.7R to 300K
0.6R to 300K
0.6R to 300K
0.33R to 300K
0.33R to 300K
General Note
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
A subsidiary of
All information is subject to Welwyn’s own
product
product specification at time
liability.
Welwyn Components
the right to
right
changes in
data and is considered accuratewithout of going liability.
TT electronics reserves
reserves the
make
to make changes in
specification without notice or
notice or to print.
TT electronics plc
A subsidiary of
All information is subject to Welwyn’s own data and is considered accurate at time of
of going to print.
All information is subject to TT electronics’ own data and is considered accurate at time
going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
TT electronics plc
07.11
Telephone: +44 (0) 1670
Limited
· Bedlington, (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© Welwyn Components
822181 · Facsimile: +44 Northumberland NE22 7AA, UK
© TT electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
07.11
Telephone: +44 (0) 1670
02. 12
Ultra Precision Bulk
Bulk Metal
Ultra Precision
Metal
Resistors
Film
Film Resistors
4800 Series
4800 series
Welwyn Components
Physical Data
Dimensions (mm) & Weight (g)
Type
4802
4812
4804
4805
4832
L max
8.9
7.5
15.2
22.6
9.7
H max
10.2
8
13.2
13.2
5.4
W max
3.8
2.5
3.8
3.8
9.7
T min
30
30
30
30
30
d nom
0.6
0.6
0.6
0.6
0.6
S nom
5.1
5.1
10.2
17.8
1.5
Wt. nom
1
0.6
1.5
2
1.1
d
H
H
4802/12/04/05
L
W
T
S
4832
d dia
L
T
W
S
Construction
The resistor element is an etched bulk metal foil, bonded to
an alumina substrate. Connections to the foil are made by
copper wires welded to the foil to minimise thermal e.m.f.
Before encapsulation, the resistor element is coated with
silicone rubber to isolate the element from mechanical stress
which would adversely affect the carefully balanced
construction and result in poor resistance/temperature
characteristics.
Terminations
Material
Strength
Solderability
Solder coated copper wire
The terminations meet the requirements of
IEC 68.2.21.
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2.
Marking
Type reference, resistance value, tolerance and date code are
legend marked. The resistance value conforms to IEC 62.
Solvent Resistance
The protection will withstand all normal industrial solvents
suitable for cleaning printed circuit boards.
Performance Data
Actual
Load at commercial rating: 1000 hours at 70°C
Dry heat: 1000 hours at 155°C
Shelf life: 12 months at room temperature
Derating from rated power at 70°C
Short term overload
Climatic category
Climatic
Long term damp heat
Temperature rapid change
Resistance to solder heat
Vibration and bump
Noise. (in a decade of frequency)
Voltage coefficient of resistance
Insulation Resistance
Inductance
Capacitance
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
µV/V
ppm/V
ohms
µH
pF
Maximum
0.05
0.05
Zero at 155°C
0.01
55/155/56
0.05
0.05
0.01
0.01
0.01
Below level of
practicable measurement
>1000M
0.2
1
0.08
0.5
0.03
0.03
0.005
0.005
0.005
0.005
Typical
0.02
0.02
0.0025
Packaging
All components are supplied loose packed in either plastic bags
or panel boxes. Quantity per box will depend on resistor size.
General Note
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 ·
make changes in product specification without notice or liability.
Website: www.welwyn-tt.com
TT electronics reserves the right to
Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com ·
07.11
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
187
© TT electronics plc
02. 12
Ultra Precision
Ultra Precision Bulk
Bulk
Metal Film Resistors
Film Resistors
4800 Series
4800 series
Metal
Welwyn Components
Ordering Procedure
Example: 4812 at 73.2 kilohms and 0.01% tolerance -
4812
–
73K2L
I
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
E
L
P
W
0.005%
0.01%
0.02%
0.05%
B
C
D
F
0.1%
0.25%
0.5%
1%
Packing
I
Bag / Box
Standard
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
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
07.11
Telephone: +44 (0) 1670
© TT electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
02. 12
微控制器 MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
