Datasheet

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)
Temperature Rise (°C)
Derating Curve
0
20
40
60
80
100
0 50 100 150 200 250 300
Ambient Temperature (°C)
Proportion of Rated Power (%)
ULW2
ULW3 ULW4
ULW5
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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
02.12