STMicroelectronics L78L06ABUTR

Overview

L78L06ABUTR from STMicroelectronics is a fixed-output +6 V, 100 mA positive voltage regulator in SOT-89 package, featuring thermal overload protection, short-circuit current limiting, and ±4% output voltage tolerance at 25 °C. It delivers stable local regulation for low-power microcontrollers, sensors, and analog circuitry with 50 µV RMS output noise and 39–46 dB supply voltage rejection at 120 Hz.

For engineers reviewing the L78L06ABUTR datasheet, L78L06ABUTR pinout, L78L06ABUTR application, or L78L06ABUTR equivalent, this device serves as a drop-in replacement for legacy 78L06 regulators in space-constrained industrial control, automotive body electronics, and IoT sensor nodes requiring robust DC/DC conversion without external components.

Technical Context

The L78L06ABUTR implements a monolithic three-terminal linear regulator architecture with internal current limiting, thermal shutdown, and safe-area protection-enabling operation up to 125 °C junction temperature. Its design eliminates need for external compensation or bypass capacitors beyond standard input/output decoupling (0.33 µF / 0.1 µF).

It operates with a minimum dropout voltage of 1.7 V across its full load range (1–100 mA) and maintains output regulation under line variations (VI = 8.5–20 V) and load changes (IO = 1–70 mA), supporting reliable power delivery in noisy automotive and industrial environments.

Key Specifications

Pinout & Package

SOT-89 package: 3-pin surface-mount plastic package with exposed die attach pad for enhanced thermal dissipation (R_thJA = 55 °C/W with 6 cm² copper pour). Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output linear regulator applications.

Compared with LM78L06ACZ, L78L06ABUTR adds automotive-grade temperature support and lower thermal resistance; versus MC78L06ABDR2G, it saves board space while maintaining identical electrical specs and thermal capability in optimized layouts.

Availability

L78L06ABUTR is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, medical wearables, and smart home controllers requiring stable component supply with guaranteed long-term continuity.

Supply support for L78L06ABUTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The L78L series targets cost-sensitive, space-constrained applications needing rugged, no-frills linear regulation-optimized for local point-of-load use in automotive ECUs, industrial PLC I/O modules, and battery-powered edge devices.

FAQ

What input voltage range is supported by the L78L06ABUTR?

The L78L06ABUTR supports an input voltage range of 8.5 V to 20 V for proper regulation at full 100 mA load. Minimum input must exceed 7.7 V (6 V + 1.7 V dropout) under all operating conditions; maximum input is limited by internal power dissipation and thermal limits-30 V absolute max for VO = 6 V per datasheet Table 1.

Can the L78L06ABUTR be used without input or output capacitors?

No. The datasheet mandates a 0.33 µF ceramic capacitor at the input and a 0.1 µF ceramic capacitor at the output, placed within 10 mm of their respective pins. Omitting either causes instability, oscillation, or poor transient response-especially under dynamic load changes typical in microcontroller-based systems.

How does the thermal performance of the SOT-89 package compare to TO-92 for this part?

In identical PCB layouts, the SOT-89 package achieves R_thJA = 55 °C/W (with 6 cm² copper pour), while TO-92 reaches only 200 °C/W. This means the SOT-89 can dissipate ~3.6× more power before reaching thermal shutdown-critical for continuous 100 mA operation in confined enclosures or elevated ambient temperatures.

Is the L78L06ABUTR pin-compatible with older 78L06 variants?

Yes-L78L06ABUTR uses the standard three-terminal configuration (IN-GND-OUT) and matches the pinout of industry-standard 78L06 regulators in SOT-89. However, its tighter ±4% tolerance (AB grade) and extended -40 to +125 °C operating range provide improved accuracy and reliability over legacy ±8% (C grade) parts.