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IRN, ULN, IRF, ULF SLIM PROFILE
WIRE WOUND, METAL CLAD RESISTORS
 IP65 RATING AVAILABLE

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The IRN(N=narrow and flat) & IRF(F=flat) models are metal-clad, wire-wound, high-power, extremely low
inductance resistors designed for industrial and other applications where space is at a premium and
performance is a must. The ULN and ULF are UL approved versions of these models.  Our extruded aluminum
housing provides rugged and strong protection. The flat design allows excellent heat dissipation. These models
are available with flying leads or tab terminals.  The most common applications for these models are
motor drives, braking and snubber applications and power sources for industrial equipment.

GENERAL SPECIFICATIONS

Model

Wattage Rating on Heat Sink

Resistance Range [ohms]

Tolerances

IRN50/ULN50C

50W

1-420

+-0.5(D)

+-1.0(F)

+-2.0(G)

+-5.0(J)

+-10(K)

IRN100/ULN100C

100W

1-1.1K

IRN150/ULN150C

150W

1-1.75K

IRF100/ULF100C

100W

1-1.1K

IRF150/ULF150C

150W

1-1.75K

IRF200/ULF200C

200W

1-2.2K

IRF250/ULF250C

250W

1-2.79K

IRF300/ULF300C

300W

1-3.5K

IRF400

400W

1-4.45K

ULF400C

400W

1-3.08K

IRF500

500W

1-5.78K

ULF500C

500W

1-2.46K

CHARACTERISTICS

1/Temperature Range

Cement:  -55C to +200C, Silicone:  -55-150C   

2/Insulation Resistance

20Mohms minimum  

3/Dielectric Strength

IRN/IRF

                              AC1500V, 2500V, 3000V, 4500V; Max. leakage current: 2mA 

ULN/ULF

  See Note 2

4/Temp. Coefficient

+-260ppm/C maximum   

5/Short Time Overload

+-[1%+0.05 ohms]                                                                                     5 X Power Rating-5sec.

6/Moisture Resistance

+-[2%+0.05 ohms]                                      40C, 95% RH, DC100V case to terminal (500hrs.)

7/Thermal Shock

+-[1%+0.05 ohms]                                                          Power rating 30min., -25C, 15minutes

8/Vibration

+-[1%+0.05 ohms]                                            10Hz-55Hz-10Hz (1min.), 2hrs. each direction

9/Moisture Load Life

+-[2%+0.05 ohms]          40C,95% RH, 0.1 X Power rating, 1.5h. on, 30min. off, 500 hours 

10/Load Life

+-[5%+0.05 ohms]                                              Power rating, 1.5h. on, 30min. off, 500 hours

Note1:
ULN/ULF dielectric strength options of 1500V, 3500V, 4500V are also available.
Optional dielectric strength must be higher than standard (calculated by formula)
 Note2:
Less than 50V:  500V 1 min.
50-600V:  [1000V+(voltage  rating X 2) 1 min.
601-1500V:  [2000V+(voltage  rating X 2.25) 1 min.

SURFACE TEMPERATURE INCREASE VERSUS POWER LOAD
 (Heatsink size 400X400X3mm)

 

DIMENSIONS

Model

Dimensions [mm]

Weight [g]

L1+-1

L2+-0.3

W1+-0.3

W2+-0.3

IRN50/ULN50

70

50

60

50

100

IRN100/ULN100

120

100

60

50

160

IRN150/ULN150

170

150

60

50

220

IRF100/ULF100

90

70

80

70

155

IRF150/ULF150

120

100

80

70

200

IRF200/ULF200

150

130

80

70

245

IRF250/ULF250

180

160

80

70

290

IRF300/ULF300

210

190

80

70

335

IRF400/ULF400

270

250

80

70

430

IRF500/ULF500

330

310

80

70

525

FLYING LEADS

Model

2mm2

1.25mm2

UL 3512 AWG 16

IRN/F 50-150

-

1ohm

-

IRF200

1-4ohm

4.1ohm

-

IRF250

1-5ohm

5.1ohm

-

IRF300

1-6ohm

6.1ohm

-

IRF400

1-8ohm

8.1ohm

-

IRF500

1-10ohm

10.1ohm

-

ULN/F 50-500

-

-

1ohm

DERATING CURVE

1 IRF,IRN,ULF,ULN100-500 on heat sink; IRN,ULN50 free air
 2 IRF,IRN,ULF,ULN100 in free air
3 IRF,IRN,ULF,ULN150 in free air
4 IRF,IRN,ULF,ULN200 in free air
5 IRF,IRN,ULF,ULN250-300 in free air
6 IRF,IRN,ULF,ULN400 in free air
7 IRF,IRN,ULF,ULN500 in free air

Heat Sink Size:
IRF,IRN,ULF,ULN100-200: 200X200X3mm
IRF,ULF250-400: 400X400X3mm
 IRF,ULF500: 600X600X3mm

ORDERING PROCEDURE EXAMPLE

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