UL Recognised

Wirewound Resistors

ULW Series

Terminations

Material:

Hot tin dipped 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

Solvent Resistance

The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits.

Flammability

The resistor coating will not burn or emit incandescent particles under any condition of applied temperature or power overload.

* Addition of 0.01Ω applies

Maximum*

Typical

Load at rated power (1000 hours @ 25°C)

ΔR%

5

3

Short term overload (5 x Pr for 5 seconds)

ΔR%

5

1

Pulse (see Pulse Performance graphs)

ΔR%

5

2

Climatic

ΔR%

5

2

Long term damp heat (56 days)

ΔR%

5

1

Climatic category

55/200/56

Temperature rapid change

ΔR%

5

1

Dry heat (1000 hours @ 200°C)

ΔR%

5

3

Vibration

ΔR%

5

1

Robustness & solder heat

ΔR%

5

1

Performance Data

Thermal Performance

Body Temperature Rise

0

50

100

150

200

250

300

0

1

2

3

4

5

Power (W)

Derating Curve

0

20

40

60

80

100

0

50

100

150

200

250

300

Ambient Temperature (°C)

ULW2 / ULWP2R

ULW3

ULW4

ULW5

BI Technologies IRC Welwyn

09.17

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