Ultra Precision Bulk
Metal Film Resistors
Resistors
Ultra Precision Bulk
4800 Series
Ultra Precision Bulk
Metal Film Resistors
Metal Film Resistors
to 0.005%
•
Tolerances down
•
Current noise and distortion below level
4800 Series
of practible measurement
•
Low thermal e.m.f
4800 Series
down to 0.005%
•
TolerancesIdeal resistor for precision instrumentation
•
distortion below level
•
Current noise and
0.005%
Tolerances down
of bulk metal gives superior stability
Use
to
•
of practible measurement
Current noise and distortion below level of practible measurement
•
Planar construction gives low residual
•
Low thermal e.m.f
capacitance and inductance
Low thermal e.m.f
•
Ideal resistor for precision instrumentation
Ideal resistor for precision instrumentation
•
Use of bulk metal gives superior stability
Use of bulk metal gives superior stability
•
Planar construction gives low residual
capacitance and inductance
Planar construction gives low residual capacitance and inductance
Welwyn Components
Welwyn Components
Electrical Data
Commercial
Power Rating at 70°C
All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
48 02/12/32
watts
ohms
volts
48 02/12/32
ppm/°C
0.5
1R0 to 100K
°C/watt
200
5
°C
0.5
1R0 to 100K
200
4804
5
1
4804
1
0R5 to 200K
350
4 80 5
5
1.5
4 80 5
1.5
R33 to 300K
500
5
80
Any value to order
All styles and products
See table 1 below
Any value to order
Notes
See table 1 below
Notes
Re tance Ra
Electrical
sis
Data
nge
Commercial
Limiting element voltage
watts
ohms
volts
ppm/°C
°C/watt
TCR (20 to 70°C)
Power Rating at 70°C
Resistance tolerance
Resistance Range
Thermal impedance
Limiting element voltage
Values
TCR (20 to 70°C)
Ambient temperature range
Resistance tolerance
Thermal impedance
Values
Ambient temperature range
0R5 to 200K
R33 to 300K
250
130
350
500
E24 and E96 preferred
5
5
-55 to 155
130
80
250
Table 1. Resistance Range
-
(ohms) and Tolerance
l st
(%)
nd products
°C
55 to 155
Al yles a
Tolerance (code)
0.005 (E)
4802/12/32
200R to 100K
4804
100R to 200K
50R to 200K
4805
65R to 300K
33R to 300K
E24 and E96 preferred
01 (L)
100R to 100
Table 1.
0.
Resistance Range (ohms) and Tolerance
K
(%)
0.02 (P)
Tolerance (code)
0.05 (W)
0.005 (E)
0.1 (B)
0.01 (L)
0.25 (C)
0.02 (P)
0.5 (D)
0.05 (W)
1.0 (F)
0.1 (B)
0.25 (C)
0.5 (D)
1.0 (F)
4802/12/32
200R to 100K
100R to 100K
50R to 100K
25R to 100K
10R to 100K
5R to 100K
2R to 100K
1R to 100K
50R to 100K
25R to 200K
17R to 300K
4804
4805
25R to 100K
10R to 200K
8R to 300K
100R to 200K
65R to 300K
10R to 100K
5R to 200K
3.3R to 300K
50R to 200K
33R to 300K
5R to 100K
2R to 200K
1.7R to 300K
25R to 200K
17R to 300K
2R to 100K
10R to 200K
0.6R to 300K
10R to 200K
8R to 300K
1R to 100K
0.5R to 200K
0.33R to 300K
5R to 200K
3.3R to 300K
2R to 200K
10R to 200K
0.5R to 200K
1.7R to 300K
0.6R to 300K
0.33R to 300K
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
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
General Note
General Note
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Welwyn Components reserves the right to make changes in product specification
or liability.
TT Electronics reserves the right to make changes in product specification without notice
without notice or liability.
All information
subject to TT Electronics’ own data and is considered
accurate at time of going
print.
All information is
is subject to Welwyn’s own data and is considered
accurate at time of going to
to print.
BI Technologies IRC Welwyn
A subsidiary of
www.ttelectronics.com/resistors
TT electronics plc
07.11
03.20
07.11
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT Electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
Ultra Precision Bulk
Metal
Ultra Precision Bulk
Metal Film Resistors
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
Solderable finish 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
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
Telephone: +44 (0) 1670 822181
make changes in product specification
Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
TT Electronics reserves the right to
· Facsimile: +44 (0) 1670 829465 ·
without notice or liability.
BI Technologies IRC Welwyn
07.11
www.ttelectronics.com/resistors
187
© TT Electronics plc
03.20
Ultra Precision Bulk
Metal Film Resistors
4800 Series
Ordering Procedure
Example: 4812-73K2LI
(4812, 73.2 kilohms ±0.01%, Pb-free)
4
8
1
1
Type
4802
4804
4805
4812
4832
2
Value
1
2
-
7
3
2
K
2
L
3
I
4
4
Tolerance
I
5
Finish & Packing
Pb-free, bulk in bag & box
E24 & E96 = 3/4 characters E = ±0.005%
More characters may be used L = ±0.01%
P = ±0.02%
for non-standard values
R = ohms
W = ±0.05%
K = kilohms
B = ±0.1%
C = ±0.25%
D = ±0.5%
F = ±1%
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
03.20
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