ULW2-47RJA25 TT Electronics/Welwyn, ULW2-47RJA25 Datasheet - Page 4

• Manufacturer Part Number: ULW2-47RJA25
• Description: RES 47 OHM 2W 5% AXIAL
• Manufacturer: TT Electronics/Welwyn
• Series: ULWr

Specifications of ULW2-47RJA25

• Featured Product: ULW Series Wirewound Resistors
• Resistance (ohms): 47
• Number Of Terminations: 2
• Package / Case: Axial
• Power (watts): 2W
• Composition: Wirewound
• Features: Flame Proof, Fusible
• Temperature Coefficient: ±200ppm/°C
• Tolerance: ±5%
• Size / Dimension: 0.150" Dia x 0.354" L (3.80mm x 9.00mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Height: -
• Other names: 985-1002-3

UL Recognised Wirewound Resistors
ULW Series
Fusing Performance
Application Notes
Application Notes
1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be
soldered closer than 4mm from the body.
2. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. An
estimate of the temperature rise to be expected can be calculated using the thermal impedance figures
given under Electrical Data.
3. For the purposes of UL approval, the following points should be observed:
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3.1 To protect against fire under all conditions of overload, a positive clearance of at least
13mm should be provided between the body of the resistor and any combustible materials.
3.2 A positive clearance of 13mm should be provided between the resistor body or terminations
and uninsulated parts of opposite polarity or uninsulated dead metal parts.
3.3 Limited Short Circuit testing should be performed in the complete appliance.
Notes:
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· Bedlington, Northumberland NE22 7AA, UK
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1. Typical fusing times are around 1/3 of the maximum figures.
2. After fusing the resistance value is >100 times the initial nominal value.
3. Suitable for fusing at voltages up to 264Vrms.
ULW3 & ULW4 Fusing Characteristic
60
ULW5 Fusing Characteristic
100
70
120
Initial Power (W)
Initial Power (W)
80
140
90
160
100
180
110
Welwyn Components
200
120
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