General Note

IRC reserves the right to make changes in product specification without notice or liability.

All information is subject to IRC’s own data and is considered accurate at time of going to print.

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TT electronics plc

• 4222 South Staples Street • Corpus Christi Texas 78411 USA

Wire and Film Technologies Division

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Low Resistance

Metal Element Resistor

Environmental Testing

LOB Series

Ω to 0.1Ω)

≤.02 µh @ 0.5MHz)

Test Parameters

MIL-STD 202

MAX %

∆R *

Unit

Load Life (2,000 hours)

Method 108

±1%

%

∆R

Thermal Shock

Method 107

±1%

%

∆R

Vibration

Method 204

±0.5%

%

∆R

Mechanical Shock

Method 213

±0.5%

%

∆R

Dielectric Strength

Method 301

±0.5%

%

∆R

Insulation Resistance

Method 302

Ohms

DESCRIPTION:

The LOB

Ω Series power precision metal element resistors feature resistance values down to 0.005 with virtually no inductance.

Available in 1, 3, and 5 watt rated axial leaded packages, these resistors are compatible with automatic insertion equipment.

APPLICATIONS:

• Switchmode and linear power supplies

• Automotive current-sensing circuits

• Instrumentation

• Regulators

CONSTRUCTION:

The LOB

Ω Series resistors feature tinned copper leads welded directly to a low-temperature coefficient resistance element in a

highly automated proprietary process. The leaded resistor elements are then encapsulated in a molding compound.

Specifications

*±0.0005 ohm allowance for test/contact error.

*Power Dissipation - The maximum wattage rating depends upon the amount of heat which can be transferred to the surroundings while not exceeding the maximum element temperature. Ambient

air temperature, velocity of cooling air, thermal resistance of heat, and the temperature of surrounding objects will affect this transfer, and must be taken into account when selecting a resistor.

Style

Continuous Power Dissipation

@ 25°C in free air (watts)

Overload Power

for 5 seconds (watts)

Maximum Working

Voltage (volts)

Maximum Storage

Temperature (°C)

LOB-1

1

5

1 x R

175

LOB-3

3

15

3 x R

175

LOB-5

5

25

5 x R

175

√

√

√

LOB Series Issue October 2008 Sheet 1 of 3