STMicroelectronics L78L06ABZ

Overview

L78L06ABZ from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 6 V output at up to 100 mA, with ±4% output voltage tolerance (A-grade), thermal overload protection, short-circuit protection, and no external components required. It operates across -40 °C to +125 °C junction temperature and features 1.7 V dropout voltage, 50 µV RMS output noise (10 Hz–100 kHz), and 39–46 dB supply voltage rejection at 120 Hz - used for local on-card regulation in industrial control modules, sensor signal conditioning circuits, and low-power microcontroller power rails.

For engineers reviewing the L78L06ABZ datasheet, L78L06ABZ pinout, L78L06ABZ application, or L78L06ABZ equivalent, this page delivers verified technical context, package-specific thermal data, real-world load/line regulation performance, and validated alternative options for fixed-voltage local regulation where input-to-output differential is ≥2.5 V and ambient operating temperature spans automotive-grade ranges.

Technical Context

The L78L06ABZ implements an internally compensated, monolithic bipolar linear regulator architecture with built-in current limiting (typically 150 mA), thermal shutdown activation at ~165 °C junction temperature, and safe-area protection. Its internal bandgap reference and error amplifier maintain stable 6 V output under varying load (1–100 mA) and line (8.5–20 V input) conditions.

It supports TO-92, SO-8, and SOT-89 packages - the ABZ suffix denotes TO-92 packaging with extended temperature grade (-40 °C to +125 °C). Thermal resistance is 200 °C/W (junction-to-ambient, no heatsink) and 15 °C/W (junction-to-case), enabling 100 mA operation without forced cooling when PCB copper area is optimized.

Key Specifications

Pinout & Package

Supplied in TO-92 package (ABZ suffix), with 3 leads: Input (pin 1), Ground (pin 2), Output (pin 3). The TO-92 case provides 200 °C/W junction-to-ambient thermal resistance without heatsink; mounting on ≥6 cm² copper area reduces R_thJA significantly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM78L06ACZ and MC78L06ABPRAG, the L78L06ABZ offers superior thermal robustness, lower dropout, and lower noise - making it the optimal choice for space-constrained, wide-temperature, and precision analog applications where reliability and signal integrity are critical.

Availability

L78L06ABZ is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, medical wearables, and smart home controllers requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant sourcing.

Supply support for L78L06ABZ 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 belongs to ST's legacy linear regulator product line, engineered specifically for cost-effective, robust, and easy-to-use fixed-voltage regulation in space- and reliability-constrained embedded systems.

FAQ

What is the minimum input voltage required for stable 6 V output at 100 mA?

The L78L06ABZ requires a minimum input voltage of 7.7 V to maintain regulation at 100 mA load, based on its 1.7 V typical dropout voltage. At light loads (<10 mA), input can drop to 6.5 V while retaining output accuracy within ±4%. Input below 6.5 V causes output to track input linearly.

Can L78L06ABZ be used in parallel to increase output current?

No - the L78L06ABZ lacks current-sharing capability and has no built-in balancing features. Parallel connection risks thermal runaway due to mismatched output voltages and unequal current distribution. For >100 mA, use a single higher-current regulator (e.g., L7806CD2T) or add an external pass transistor per Figure 14 in DS0424.

Is an input capacitor mandatory, and what value is recommended?

Yes - a minimum 0.33 µF ceramic capacitor is mandatory between input and ground, placed ≤5 mm from pins 1 and 2. This prevents high-frequency oscillation caused by trace inductance. For noisy input sources (e.g., switchers), add a 10 µF tantalum in parallel to improve low-frequency ripple rejection.

Does L78L06ABZ require a heat sink in TO-92 package at full 100 mA load?

At 100 mA with 12 V input (6 V drop × 100 mA = 600 mW dissipation), junction temperature rise is ~120 °C above ambient (200 °C/W × 0.6 W) - exceeding safe limits. A minimum 2 cm² copper pour is required; for continuous 100 mA operation in >50 °C ambient, a small clip-on heatsink or SO-8 variant (L78L06ABD) is strongly recommended.