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Resistors

UL Recognised

Wirewound Resistors

ULW Series

UL1412 recognised fusible resistor *

Failsafe mains fusing at 120 / 240Vrms

Inrush and surge withstanding

UL94-V0 flameproof coating

Surface mount ZI-form option

* UL file number E234469.

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

-55 to +155

250

350

Any value in range 4R7 to 100R is recognised. E24 preferred

4R7 to 100

watts

ULW3

4R7 to 100

±200

500

ULW4

4R7 to 100

ULW5

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

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

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.

BI Technologies IRC Welwyn

www.ttelectronicsresistors.com

06.16

UL Recognised

Wirewound Resistors

ULW Series

Terminations

Material:

Strength:

Solderability:

Hot tin dipped copper wire

The terminations meet the requirements of IEC 68.2.21

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.

Performance Data

Maximum*

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

Short term overload (5 x Pr for 5 seconds)

Pulse (see Pulse Performance graphs)

Climatic

Long term damp heat (56 days)

Climatic category

Temperature rapid change

Dry heat (1000 hours @ 200°C)

Vibration

Robustness & solder heat

* Addition of 0.01Ω applies

ΔR%

55/200/56

Typical

Thermal Performance

Derating Curve

300

Body Temperature Rise

Proportion of Rated Power (%)

100

150

200

250

300

Am bient Tem perature (°C)

Temperature Rise (°C)

250

200

150

100

ULW2

ULW3

ULW4

ULW5

Power (W)

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.

BI Technologies IRC Welwyn

www.ttelectronicsresistors.com

06.16

UL Recognised

Wirewound Resistors

ULW Series

Pulse

E (J)

ULW3

Pulse

ULW2

E (J)

ULW5

ULW3

ULW2

ULW5

Pulse Performance

Value ohms

4.7

4.3

5.3

Value ohms

1.7

3.6

4.7

10.42

9.73

4.3

5.3

1.7

3.6

10.42

9.73

3.2

11.35

3.2

11.35

3.9

1.3

9.51

3.9

1.3

9.51

5.3

1.7

8.89

5.3

1.7

8.89

2.8

1.75

10.3

2.8

1.75

10.3

4.9

1.8

12.66

4.9

1.8

12.66

(single or low repetition rate,

ΔR<5%)

(single or low repetition rate,

ΔR<5%)

Pulse Energy Limit

(10 pulses at 10s intervals, ΔR <5%)

Note the voltage shown is the nett voltage across the resistor. The generator

open circuit voltage will be higher due to the generator’s internal impedence.

1.2/50μs Peak Voltage Limit

Peak Voltage (kV)

ULW5

ULW3 & 4

ULW2

ULW5

ULW3 & 4

ULW2

Pulse Energy (J)

ULW2

100

Value (ohms)

Fusing Performance

ULW2 Fusing Characteristic

Maximum Fusing Time (s)

Initial Power (W)

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.

BI Technologies IRC Welwyn

www.ttelectronicsresistors.com

06.16

UL Recognised

Wirewound Resistors

ULW Series

Fusing Performance

ULW3 & ULW4 Fusing Characteristic

Maximum Fusing Time (s)

180

160

140

120

100

110

120

Initial Power (W)

ULW5 Fusing Characteristic

Maximum Fusing Time (s)

100

120

140

Initial Power (W)

160

180

200

Notes:

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, provided the initial power

is at least 20 x rated power.

3. Suitable for fusing at voltages up to 264Vrms.

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:

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.

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.

BI Technologies IRC Welwyn

www.ttelectronicsresistors.com

06.16

UL Recognised

Wirewound Resistors

ULW Series

Packaging

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:

http://www.ttelectronicsresistors.com/pdf/datasheet/ZI-form.pdf.

Dimensions (mm)

Type

ULW2

ULW3

ULW4

ULW5

Figure 1

Body location f1 - f2 <1.4mm

Ordering Procedure

Example: ULW2-33RJA25

(ULW2, 33 ohms ±5%, Pb-free)

Type

Leadforming

Value

3/4 characters

R = ohms

Tolerance

J = ±5%

Packing

A25

ULW2

Ammo pack, 2500/box

A1 ULW3, ULW4 Ammo pack, 1000/box

T075

ULW5

Tape & reel, 750/reel

ULW2 Optional code

ULW3

ULW4

ULW5

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.

BI Technologies IRC Welwyn

www.ttelectronicsresistors.com

06.16