Pulse Withstanding

Chip Resistors

PWC Series

Pulse Withstanding

Chip Resistors

PWC Series

© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK

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

07. 08

Performance Data

Welwyn Components

Pulse Performance Data

Lightning Surge

Lightning surge resistors are tested in

accordance with IEC 60 115-1 using

both 1.2/50µs and 10/700µs pulse shapes.

10 pulses are applied. The limit of

acceptance is a shift in resistance of less

than 1% from the initial value.

Size

Maximum

Typical

Load at rated power: 1000 hours at 70°C

ΔR%

1

0.25

Shelf life test: 12 months at room temperature

ΔR%

0.1

0.02

Derating from rated power at 70°C

Zero at 155°C

Overload: 6.25 x rated power for 2 seconds

ΔR%

1

0.1

Dry heat: 1000 hours at 155°C

ΔR%

1

0.2

Long term damp heat

ΔR%

1

0.25

Temperature rapid change

ΔR%

0.25

0.05

Resistance to solder heat

ΔR%

0.25

0.05

Resistance to sulphur-bearing gas (AS version only): ASTM-B-809

0.25

0.05

Voltage proof

Volts

500

Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms.

Pulse Performance Data

Lightning Surge

Lightning surge resistors are tested in accordance with IEC 60 115-1 using both 1.2/50µs and 10/700µs pulse shapes. 10 pulses are applied. The limit of

acceptance is a shift in resistance of less than 1% from the initial value.

2512

2010

1206

0805

0603

2512

2010

1206

0805

0603

09.18

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.

© TT Electronics plc

www.ttelectronics.com/resistors

BI Technologies IRC Welwyn