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LP395

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SNOSBF3C –APRIL 1998–REVISED MARCH 2013

LP395 Ultra Reliable Power Transistor

Check for Samples: LP395

The LP395 is easy to use and only a few precautions

FEATURES

need be observed. Excessive collector to emitter

• Internal Thermal Limiting

voltage can destroy the LP395 as with any transistor.

• Internal Current and Power Limiting

When the device is used as an emitter follower with a

low source impedance, it is necessary to insert a 4.7

• Specified 100 mA Output Current

kΩ resistor in series with the base lead to prevent

• 0.5 μA Typical Base Current

possible emitter follower oscillations. Also since it has

• Directly Interfaces with TTL or CMOS

good high frequency response, supply by-passing is

recommended.

• +36 Volts On Base Causes No Damage

• 2 μs Switching Time

Areas where the LP395 differs from a standard NPN

transistor are in saturation voltage, leakage

(quiescent) current and in base current. Since the

DESCRIPTION

internal protection circuitry requires voltage and

The LP395 is a fast monolithic transistor with

current to function, the minimum voltage across the

complete overload protection. This very high gain

device in the on condition (saturated) is typically 1.6

transistor has included on the chip, current limiting,

Volts, while in the off condition the quiescent

power limiting, and thermal overload protection,

(leakage) current is typically 200 μA. Base current in

making it difficult to destroy from almost any type of

this device flows out of the base lead, rather than into

overload. Available in an epoxy TO-92 transistor

the base as is the case with conventional NPN

package this device is specified to deliver 100 mA.

transistors. Also the base can be driven positive up to

Thermal limiting at the chip level, a feature not

36 Volts without damage, but will draw current if

available in discrete designs, provides

driven negative more than 0.6 Volts. Additionally, if

comprehensive protection against overload.

the base lead is left open, the LP395 will turn on.

Excessive power dissipation or inadequate heat

The LP395 is a low-power version of the 1-Amp

sinking causes the thermal limiting circuitry to turn off

LM195/LM295/LM395 Ultra Reliable Power

the device preventing excessive die temperature.

Transistor.

The LP395 offers a significant increase in reliability

The LP395 is rated for operation over a −40°C to

while simplifying protection circuitry. It is especially

+125°C range.

attractive as a small incandescent lamp or solenoid

driver because of its low drive requirements and

blowout-proof design.

Connection Diagram

Typical Applications

Figure 1. TO-92 Package

See NS Package LP0003A

Figure 2. Fully Protected Lamp Driver

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.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (12 pages)

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LP395 www.ti.com SNOSBF3C – APRIL 1998 – REVISED MARCH 2013 LP395 Ultra Reliable Power Transistor Check for Samples: LP395 FEATURES 1 • • • • • • • 2 Internal Thermal Limiting Internal Current and Power Limiting Specified 100 mA Output Current 0.5 μA Typical Base Current Directly Interfaces with TTL or CMOS +36 Volts On Base Causes No Damage 2 μs Switching Time DESCRIPTION The LP395 is a fast monolithic transistor with complete overload protection.
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LP395 SNOSBF3C – APRIL 1998 – REVISED MARCH 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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LP395 www.ti.com SNOSBF3C – APRIL 1998 – REVISED MARCH 2013 SIMPLIFIED CIRCUIT APPLICATIONS INFORMATION One failure mode incandescent lamps may experience is one in which the filament resistance drops to a very low value before it actually blows out. This is especially rough on most solid-state lamp drivers and in most cases a lamp failure of this type will also cause the lamp driver to fail.
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LP395 SNOSBF3C – APRIL 1998 – REVISED MARCH 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS 4 5 Volt Transfer Function 36 Volt Transfer Function Figure 3. Figure 4. Collector Characteristics Available Collector Current Figure 5. Figure 6. Quiescent Collector Current Saturation Voltage Figure 7. Figure 8.
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LP395 www.ti.com SNOSBF3C – APRIL 1998 – REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Collector Current Threshold Figure 9.
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LP395 SNOSBF3C – APRIL 1998 – REVISED MARCH 2013 www.ti.com TYPICAL APPLICATIONS Figure 10. Lamp Flasher (Short Circuit Proof) Figure 11. Optically Isolated Switch Figure 12. Two Terminal Current Limiter Figure 13.
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LP395 www.ti.com SNOSBF3C – APRIL 1998 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision B (March 2013) to Revision C • Page Changed layout of National Data Sheet to TI format ............................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 18-Oct-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.