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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Texas Instruments LP395Z/NOPB

Name: LP395Z/NOPB
Brand: Texas Instruments
SKU: LP395Z/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LP395Z/NOPB

Manufacturer:: Texas Instruments

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: LP395Z/NOPB.pdf

Description:: TRANS NPN 36V TO-92-3

Quantity:: RFQ Add To RFQ list

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Inventory:1,747

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Product details

Overview

LP395Z/NOPB from Texas Instruments is a monolithic NPN power transistor with integrated thermal, current, and power limiting-designed as a robust, low-drive lamp/solenoid driver. It delivers 100 mA output, features 0.5 μA typical base current (flowing *out* of base), 2 μs switching time, and operates across −40°C to +125°C in TO-92 package.

For engineers reviewing the LP395Z/NOPB datasheet, LP395Z/NOPB pinout, LP395Z/NOPB application, or LP395Z/NOPB equivalent, key selection criteria include its blowout-proof cold-filament inrush handling, 1.82 V max saturation voltage at 100 mA, ±36 V base tolerance, and open-base turn-on behavior-critical for fail-safe lamp control and industrial solenoid interfacing.

Technical Context

The LP395Z/NOPB integrates on-die protection circuitry requiring minimum 1.6 V V_CE in saturation to activate, resulting in higher V_CE(SAT) than standard NPN transistors. Its base current flows *outward*, enabling direct TTL/CMOS interface without external pull-downs.

Unlike conventional NPNs, it turns on when the base is left floating and withstands +36 V base drive without damage-but draws reverse current if base is pulled below emitter by >0.6 V. Thermal limiting disables conduction before die temperature exceeds safe limits under overload.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	100 mA continuous-supports small incandescent lamps and solenoids without external current limiting.
Saturation Voltage	1.82 V max at IC = 100 mA-defines minimum headroom needed across collector-emitter in on-state.
Base Current	−0.3 μA typical (out of base)-enables direct logic-level drive with no base resistor required in many configurations.
Switching Time	2 μs-supports moderate-speed on/off cycling for lamp flashing and pulsed load control.
Operating Temperature	−40°C to +125°C-qualified for under-hood automotive, industrial controls, and wide-ambient embedded systems.
V_CE Max	36 V-sets maximum supply rail compatibility for 24 V industrial and 32 V automotive auxiliary circuits.
Thermal Resistance	150°C/W (0.4″ leads)-guides heatsinking requirements for sustained 100 mA operation at elevated ambient.

Pinout & Package

LP395Z/NOPB uses a standard TO-92 (LP) package per JEDEC TO-226 variation AA, with straight leads, 5.34 mm max height, and marking "LP 395Z".

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to load return; base current flows out through this pin in active mode.
2 (Base)	Control input	Accepts +36 V max drive; turns device on when ≥0.7 V above emitter; floats high to enable turn-on.
3 (Collector)	Power input terminal	Connects to positive supply; current flows from collector to emitter when base is active.

Key Features

Feature	Design Value
Internal thermal limiting	Automatically disables conduction before junction temperature exceeds safe threshold-no external thermal shutdown circuit needed.
Blowout-proof design	Survives lamp filament short-circuit events without failure-eliminates need for series fuses or redundant drivers.
Low quiescent leakage	0.24 mA max IQ at V_BE = 0 V-minimizes standby power loss in battery-operated lamp/solenoid systems.
Direct TTL/CMOS interface	No base resistor required due to outward base current-reduces BOM count and PCB area in digital-output-driven loads.
+36 V base tolerance	Withstands overvoltage transients on control line-enhances reliability in noisy industrial environments.

Applications

Lamp Driver	Solenoid Interface
Use Scenario: Driving 12 V/24 V incandescent indicator lamps in automotive dashboards or industrial HMIs where filament shorts must not destroy the driver. IC Role / Device Role / Timing Role: High-gain, protected NPN switch providing current-limited, thermally self-protected load control. Use Value: Eliminates external current-limiting resistors and fuses while extending lamp life via cold-filament inrush limiting.	Use Scenario: Controlling 24 V DC solenoids in factory automation valves or vending machine actuators subject to mechanical jamming. IC Role / Device Role / Timing Role: Robust power switch with built-in current and thermal foldback to survive sustained stall currents. Use Value: Prevents driver destruction during solenoid coil lock-up-reducing field failure rates and service costs.
Optically Isolated Switch	Two-Terminal Current Limiter
Use Scenario: Output stage of an optocoupler-based control circuit driving AC/DC loads where galvanic isolation and fault resilience are mandatory. IC Role / Device Role / Timing Role: Isolated-side power switch with inherent short-circuit immunity and no external protection components. Use Value: Simplifies isolated I/O design by integrating protection previously requiring discrete MOSFETs + sense resistors + comparators.	Use Scenario: Creating a self-contained, two-wire current limiter for sensor biasing or LED string control in space-constrained modules. IC Role / Device Role / Timing Role: Two-terminal device (base tied to collector) functioning as programmable current source with thermal foldback. Use Value: Enables compact, reliable current regulation without op-amps, references, or external feedback networks.

Lamp Driver

Solenoid Interface

Use Scenario: Driving 12 V/24 V incandescent indicator lamps in automotive dashboards or industrial HMIs where filament shorts must not destroy the driver.

IC Role / Device Role / Timing Role: High-gain, protected NPN switch providing current-limited, thermally self-protected load control.

Use Value: Eliminates external current-limiting resistors and fuses while extending lamp life via cold-filament inrush limiting.

Use Scenario: Controlling 24 V DC solenoids in factory automation valves or vending machine actuators subject to mechanical jamming.

IC Role / Device Role / Timing Role: Robust power switch with built-in current and thermal foldback to survive sustained stall currents.

Use Value: Prevents driver destruction during solenoid coil lock-up-reducing field failure rates and service costs.

Optically Isolated Switch

Two-Terminal Current Limiter

Use Scenario: Output stage of an optocoupler-based control circuit driving AC/DC loads where galvanic isolation and fault resilience are mandatory.

IC Role / Device Role / Timing Role: Isolated-side power switch with inherent short-circuit immunity and no external protection components.

Use Value: Simplifies isolated I/O design by integrating protection previously requiring discrete MOSFETs + sense resistors + comparators.

Use Scenario: Creating a self-contained, two-wire current limiter for sensor biasing or LED string control in space-constrained modules.

IC Role / Device Role / Timing Role: Two-terminal device (base tied to collector) functioning as programmable current source with thermal foldback.

Use Value: Enables compact, reliable current regulation without op-amps, references, or external feedback networks.

Equivalent & Alternatives

The following parts are listed as comparable options for similar protected NPN transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM395Z/NOPB	1 A rated output vs. LP395Z/NOPB's 100 mA; larger TO-39 package; identical protection architecture.	Used in higher-power lamp banks or relay coils; requires more board area and thermal management.	Select LM395Z/NOPB only when >100 mA load current or higher power dissipation is required.
ZTX653	No integrated protection; standard NPN with 1 A rating; 0.5 V V_CE(SAT); requires external current/thermal protection circuitry.	Suitable for cost-sensitive designs where protection is implemented at system level-not component level.	Choose ZTX653 only if full custom protection is already designed and validated; LP395Z/NOPB reduces validation effort.

Compared with LM395Z/NOPB and ZTX653, the LP395Z/NOPB uniquely balances ultra-reliable single-chip protection with low-drive simplicity in a miniature TO-92 footprint-making it optimal for space- and reliability-constrained 100 mA load switching.

Availability

LP395Z/NOPB is available at Aetrix Electronics and suitable for industrial HMI indicators, automotive interior lighting, solenoid valve control, and opto-isolated I/O modules requiring stable component supply and long-term obsolescence mitigation.

Supply support for LP395Z/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The LP395Z/NOPB belongs to TI's Ultra Reliable Power Transistor family-designed specifically to replace unprotected discrete transistors in safety-critical electromechanical interfaces where field reliability outweighs marginal cost savings.

FAQ

What is the function of the LP395Z/NOPB in a circuit?

The LP395Z/NOPB functions as a protected NPN power switch that drives incandescent lamps, solenoids, and other moderate-current loads. Its internal thermal, current, and power limiting eliminate the need for external protection components. Unlike standard NPN transistors, it sources base current and turns on when the base is left open-making it ideal for fail-safe digital control applications.

Does the LP395Z/NOPB require a base resistor when driven by TTL or CMOS?

No, the LP395Z/NOPB does not require an external base resistor when driven directly by TTL or CMOS outputs. Its base current flows *out* of the base terminal (not into it), allowing logic-high signals to forward-bias the base-emitter junction without sinking current from the driver. This simplifies interface design and reduces component count in the LP395Z/NOPB application circuit.

What happens if the base of the LP395Z/NOPB is left unconnected?

If the base of the LP395Z/NOPB is left unconnected (open), the device turns on due to internal biasing-this is a documented feature, not a fault condition. This behavior enables simple "always-on" or fail-safe activation modes. However, in noise-prone environments, a weak pull-down may be added to ensure predictable off-state behavior in the LP395Z/NOPB design.

Can the LP395Z/NOPB safely drive a lamp with a cold filament surge?

Yes, the LP395Z/NOPB is specifically designed to handle cold-filament inrush currents common in incandescent lamps. Its internal current limiting activates during surge conditions, preventing destructive current spikes. This "blowout-proof" capability is a core specification of the LP395Z/NOPB and eliminates the need for external inrush limiters or fuses in lamp driver applications.

What is the maximum allowable base-to-emitter reverse voltage for the LP395Z/NOPB?

The LP395Z/NOPB has a maximum base-to-emitter reverse voltage rating of 10 V. Exceeding this value risks damage to the internal protection circuitry. While the device tolerates +36 V on the base relative to emitter in forward bias, pulling the base more than 0.6 V below the emitter causes reverse conduction-so clamping or limiting is advised in bidirectional control scenarios involving the LP395Z/NOPB.

LP395Z/NOPB Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: -

Voltage - Collector Emitter Breakdown (Max):: 36 V

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: -

Power - Max:: -

Frequency - Transition:: -

Operating Temperature:: 0°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

LP395Z/NOPB FAQ

1.How can I place an order for LP395Z/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LP395Z/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LP395Z/NOPB reliable?

The price and inventory of LP395Z/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP395Z/NOPB is usually 5 days.

3.What payment methods are accepted for LP395Z/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP395Z/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LP395Z/NOPB?

LP395Z/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LP395Z/NOPB order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LP395Z/NOPB?

For technical support, including LP395Z/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP395Z/NOPB requirements.

6.How does Aetrix verify that LP395Z/NOPB is sourced from the original manufacturer or authorized distributors?

All LP395Z/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LP395Z/NOPB meets industry standards.

7.What is the process for return or replacement of LP395Z/NOPB?

All LP395Z/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP395Z/NOPB, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LP395Z/NOPB part is unused and in its original packaging.

Return procedure for LP395Z/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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