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2500

更新时间： 2024-11-12 02:56:03

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描述
Low Value Metal Film Resistors

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2500 数据手册

Low Value

Metal Film Resistors

Welwyn Components

2500 Series

Resistance values down to 0.025 ohms

•

Low inductance

•

Tolerances down to 1%

•

Flameproof protection

•

Electrical Data

2504

2.0

Notes

Power rating at 25°C

Power rating at 70°C

Resistance range

watts

ohms

volts

1.5

0R025 to 1

700

Isolation voltage

TCR (+20° to 70°C)

Resistance tolerance

Thermal impedance

Values

ppm/°C

See Figure 1

1, 2, 5, 10

Measured at 6mm from caps

°C/watt

E24

Operating temperature range

°C

-55 to +150

Physical Data

Dimensions (mm) & weight (g)

PCB

Min.

bend

radius

mounting

centres

Wt.

Type

L Max

14.5

D Max

5.3

f min

23.8

d nom

0.8

nom

2504

20.3

1.2

1.1

Construction

Marking

The metal film is deposited on a high purity ceramic rod. End

caps are force fitted and termination wires welded to the

caps. The resistive film is then adjusted to the required value;

finally the cement protection is applied to the resistor body

and marked with indelible ink.

Values below R10 are colour coded with 3 bands. Values R10

and above are marked with 4 bands. IEC 62 colours are used.

Solvent Resistance

The body protection and marking are resistant to all normal

industrial cleaning fluids suitable for printed circuits.

Terminations

Material

Strength

Solder-coated copper wire.

The terminations meet the requirements of

IEC 68.2.21

Flammability

The resistors will not burn or emit incandescent particles

under any condition of applied temperature or power

overload.

Solderability The terminations meet the requirements of

IEC 115-1, Clause 4.17.3.2

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

155

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