All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
ULW2
Power rating at 25°C
5 second overload rating at 25ºC
Inrush / surge performance
Resistance range
TCR
Isolation voltage
Resistance tolerance
UL recognised standard values
Thermal impedance
Ambient temperature range
ohms
ppm/°C
volts
%
ohms
°C/watt
°C
110
82
-55 to +155
250
350
5
Any value in range 4R7 to 100R is recognised. E24 preferred
62
54
4R7 to 100
watts
watts
2
10
ULW3
3
15
4R7 to 100
±200
500
ULW4
4
20
4R7 to 100
ULW5
5
25
4R7-100
See Pulse Performance graphs
Note - no limiting element voltage applies; maximum continuous voltage is √(P.R)
Physical Data
Dimensions (mm) and weight (g)
Type
ULW2
ULW3
ULW4
ULW5
L Max
9.0
14.5
13
16.5
D Max
3.8
5.8
5.6
7.2
f min
19.8
24.6
22.8
23.6
0.8
d nom
PCB
mount
centres
12.7
20.3
18.9
22.9
1.2
Min
bend
radius
Wt.
Nom
0.5
1.1
1.0
1.8
d
D
L
f
Construction
A high purity ceramic rod is assembled with interference fit end caps to which are welded the terminations. The surge withstanding resistive element is
wound on the rod and welded to the caps. Flameproof fusible cement coating is applied prior to marking with indelible ink. The components are then
leadformed if required and packed.
Marking
ULW2 & ULW3 resistors are marked with five colour bands. The first four indicate value and tolerance in conformance with IEC62. The fifth yellow band
denotes defined fusibility. ULW4 and ULW5 resistors are legend marked with type, value and tolerance.
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.
The standard packaging for ULW is taped. The critical dimensions are shown in Figure 1. The component wires will not protrude beyond the outside edge
of the tapes. Taped product is then packed into ammo boxes for ULW2, 3 and 4 or onto reels for ULW5. Alternative packaging is available by request. These
products are also available in a range of lead forming options. In particular, they are available in ZI-form SMD format packed in blister tape - see:
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