High Power

Chip Resistors

SC3 Series

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

Issue A · 03.02

Welwyn Components

85

Typical

1

%

R

5

.

0

%

R

5

.

0

%

R

5

.

0

%

R

5

.

0

%

R

5

.

0

%

R

5

2

.

0

%

R

R%

0.25

5

2

.

0

%

R

1

.

0

%

R

90 Seconds min.

Performance Data

Temperature Rise vs Pad Area

Construction

Resistive thick film material, overglaze and organic protection

are screen printed on a 96% alumina substrate. The

components are laser trimmed to achieve the required

resistance tolerance.

Terminations

The wrap-around copper terminations have an electroplated

nickel barrier and tin-lead solder coating, this ensures

excellent ‘leach’ resistance properties and solderability.

Chips can withstand immersion in solder at 250˚C for 90

seconds and are suitable for reflow or wave soldering

mounting applications.

Marking

The body protection and marking are resistant to all normal

industrial cleaning solvents suitable for printed circuits.

Chips are packed and mounted with marking side up.

The SC3 Chips are mounted with the actual resistor element

mounted face down on its termination pads.

1000

100

10

Termination Pad Area (each end)

1 watt

2 watt

3 watt

Pulse Power Rating

100

10

1

0

.

0

1

0

.

1

1

.

0

Time (sec)

The wrap-around terminations have an electroplated nickel

barrier and matte tin finish. This ensures

excellent ‘leach’ resistance properties and solderability.

Issue B · 01.07