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产品型号4812的Datasheet PDF文件预览

Ultra Precision Bulk

Metal Film Resistors

Welwyn Components

4800 Series

• BS/CECC approved

Tolerances down to 0.005%

Current noise and distortion below level

of practible measurement

•

Low thermal e.m.f

Ideal resistor for precision instrumentation

Use of bulk metal gives superior stability

Planar construction gives low residual

capacitance and inductance

•

Electrical Data

Commercial

4802/12/32

4804

4805

Notes

Power Rating at 20°C

Resistance Range

watts

0.5

1.5

ohms 1R0 to 100K 0R5 to 200K 33R0 to 300K

Limiting element voltage

TCR (20 to 70°C)

volts

200

350

500

ppm/°C

Resistance tolerance

See table 1 below

Approved BS CECC 40-302-002*

Power rating at 70°C

Resistance range

4802/12

0.25

watts

ohms

100 to 56K

200

Limiting element voltage

TCR (-55 to 125°C)

volts

ppm/°C

Resistance tolerance

Thermal impedance

Values

See table 1 below

°C/watt

°C

250

130

E24 and E96 preferred

-55 to 155

Any value to order

Ambient temperature range

All styles and products

* BS CECC 40 Style reference: 4802 BX; 4812 CX

Table 1. Resistance Range (ohms) and Tolerance (%)

Tolerance (code)

0.005 (E)

0.01 (L)

4802/12/32

200R to 100K

100R to 100K

50R to 100K

25R to 100K

10R to 100K

5R to 100K

4804

4805

100R to 200K

50R to 200K

25R to 200K

10R to 200K

5R to 200K

2R to 200K

10R to 200K

0.5R to 200K

65R to 300K

33R to 300K

17R to 300K

8R to 300K

0.02 (P)

0.05 (W)

0.1 (B)

3.3R to 300K

1.7R to 300K

0.6R to 300K

0.33R to 300K

0.25 (C)

0.5 (D)

2R to 100K

1.0 (F)

1R to 100K

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

Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

Issue B · 03.02

186

Ultra Precision Bulk Metal

Film Resistors

Welwyn Components

4800 series

Physical Data

Dimensions (mm) & Weight (g)

4802/12/04/05

Type

L max

H max

10.2

W max

3.8

T min

d nom

0.6

S nom Wt. nom

4802

4812

4804

4805

4832

8.9

5.1

7.5

2.5

0.6

1.5

d dia

15.2

22.6

9.7

13.2

5.4

3.8

0.6

10.2

17.8

1.5

4832

3.8

0.6

9.7

0.6

1.1

Terminations

Material

Strength

Construction

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.

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.

Solderability

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

Maximum

0.05

Typical

0.02

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

∆R%

0.05

0.02

0.0025

Zero at 155°C

55/155/56

∆R%

0.01

0.005

Climatic category

Climatic

∆R%

µV/V

0.05

0.01

0.03

Long term damp heat

Temperature rapid change

Resistance to solder heat

Vibration and bump

0.005

Noise. (in a decade of frequency)

Below level of

practicable measurement

>1000M

Voltage coefficient of resistance

Insulation Resistance

Inductance

ppm/V

ohms

µH

0.2

0.08

0.5

Capacitance

Packaging

All components are supplied loose packed in either plastic bags

or panel boxes. Quantity per box will depend on resistor size.

Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

Issue B · 03.02

187

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