Performance Data

CECC 40101-004 CECC 40101-804 *ACTUAL PERFORMANCE

REQUIREMENTS REQUIREMENTS MAXIMUM

TYPICAL

Load at commercial rating: 1000 hours at 70°C

∆R%

0.3

0.1

Load at CECC rating: 1000 hours at 70°C

∆R%

0.5

0.5

0.3

0.05

Dry heat: 1000 hours at 155°C

∆R%

0.5

0.5

**1.0

0.15

Shelf life: 12 months at room temperature

∆R%

Not specified

Not specified

0.1

0.03

Derating from rated power at 70°C

Zero at 155°C

50% at 125°C

Short term overload

∆R%

0.1

0.1

0.1

0.02

Climatic

∆R%

0.5

0.5

0.3

0.1

Climatic category

55/155/56

55/125/56

55/155/56

Long term damp heat

∆R%

0.5

0.5

0.5

0.1

Temperature rapid change

∆R%

0.1

0.1

**0.2

0.05

Resistance to solder heat

∆R%

0.1

0.1

0.06

0.03

Vibration and bump

∆R%

0.1

0.1

0.06

0.02

Noise (in a decade of frequency)

µV/V

Not specified

Not specified

1.0

0.1

Voltage coefficient of resistance

ppm/V

Not specified

Not specified

<1

Note: *An 0.01 ohm addition to be added to the performance claims of all resistors <10R.

** All products within the specified approved range meet CECC requirements.

Precision Metal

Film Resistors

RC SERIES

© Welwyn Components Limited

Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk

Issue A 07/99

CONSTRUCTION

A metal film is deposited onto a high quality ceramic

former. Nickel-plated steel caps are force fitted to the

former and termination wires are welded to the caps.

The resistor is adjusted to value by a helical cut in

the film and the body is protected with a specially

formulated epoxy coating.

TERMINATIONS

Material

Solder coated 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.

MARKING

Type reference, TCR code, resistance value and

tolerance code.

The resistance values conform to IEC 62.

SOLVENT RESISTANCE

The body protection and marking are resistant to all

normal industrial cleaning solvents suitable for

printed circuits.

Physical Data

Dimensions (mm) & Weight (g)

PCB

Min.

mounting

Bend

Type

L max

D max

f min

d nom

centres

Radius

Wt. nom

RC55

7.2

2.5

30

0.6

10.2

0.6

0.24

RC65

10.0

3.7

30

0.6

12.7

0.6

0.40

RC70

15.5

5.5

30

0.8

18.4

1.2

1.15

L

D

f

d

174