LM195, LM395

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SNOSBO4C – JUNE 1999 – REVISED APRIL 2013

LM195/LM395 Ultra Reliable Power Transistors

Check for Samples: LM195, LM395

For low-power applications (under 100 mA), refer to

1

FEATURES

the LP395 Ultra Reliable Power Transistor.

2

•

Internal Thermal Limiting

The LM195/LM395 are available in the standard TO-

•

Greater than 1.0A Output Current

3, Kovar TO-5, and TO-220 packages. The LM195 is

•

3.0

μA Typical Base Current

rated for operation from

−55°C to +150°C and the

•

500 ns Switching Time

LM395 from 0°C to +125°C.

•

2.0V Saturation

Simplified Circuit

•

Base Can be Driven up to 40V without Damage

•

Directly Interfaces with CMOS or TTL

•

100% Electrical Burn-in

DESCRIPTION

The

LM195/LM395

are

fast,

monolithic

power

integrated circuits with complete overload protection.

These devices, which act as high gain power

transistors, have included on the chip, current limiting,

power

limiting,

and

thermal

overload

protection

making them virtually impossible to destroy from any

type of overload. In the standard TO-3 transistor

power package, the LM195 will deliver load currents

in excess of 1.0A and can switch 40V in 500 ns.

The inclusion of thermal limiting, a feature not easily

available

in

discrete

designs,

provides

virtually

absolute

protection

against

overload.

Excessive

power dissipation or inadequate heat sinking causes

the thermal limiting circuitry to turn off the device

preventing excessive heating.

The LM195 offers a significant increase in reliability

as well as simplifying power circuitry. In some

applications, where protection is unusually difficult,

such as switching regulators, lamp or solenoid drivers

where normal power dissipation is low, the LM195 is

especially advantageous.

The LM195 is easy to use and only a few precautions

need be observed. Excessive collector to emitter

voltage can destroy the LM195 as with any power

transistor. When the device is used as an emitter

follower with low source impedance, it is necessary to

insert a 5.0k resistor in series with the base lead to

prevent

possible

emitter

follower

oscillations.

Although the device is usually stable as an emitter

follower, the resistor eliminates the possibility of

Figure 1. 1.0 Amp Lamp Flasher

trouble without degrading performance. Finally, since

it

has

good

high

frequency

response,

supply

bypassing is recommended.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.