STMicroelectronics L78L33ACZ Linear Voltage Regulator 3.3V 100mA TO-92-3 Package

STMicroelectronics L78L33ACZ Linear Voltage Regulator: Precision Power Management Solution

Engineered for reliability and efficiency, the STMicroelectronics L78L33ACZ linear voltage regulator represents a benchmark in fixed-output power regulation technology. This compact TO-92-3 packaged device delivers precise 3.3V output at 100mA current capacity while incorporating advanced protection mechanisms for industrial and consumer electronics applications.

Designed with modern power system requirements in mind, this fixed linear regulator combines robust performance characteristics with space-saving packaging. Its maximum input voltage capability of 30V provides flexibility across various power supply configurations, while maintaining a stable 3.3V output with minimal ripple and noise. The device's 49dB PSRR (Power Supply Rejection Ratio) at 120Hz ensures clean voltage delivery even in electrically noisy environments.

Key Performance Features

At the heart of this regulator's design lies its advanced thermal management system. The integrated over-temperature protection circuitry automatically reduces output current when safe operating temperatures are exceeded, preventing potential damage from thermal runaway. This feature, combined with built-in over-current and short-circuit protection, makes the L78L33ACZ exceptionally durable in demanding applications.

With a quiescent current of just 5.5mA and maximum supply current of 6mA, this regulator demonstrates exceptional efficiency in standby mode. The device maintains stable output voltage across its entire operating temperature range of 0°C to 125°C, making it suitable for both commercial and industrial environments where thermal stability is critical.

Design Flexibility and Application Scope

The L78L33ACZ's TO-92-3 package offers excellent thermal dissipation characteristics while maintaining compatibility with standard through-hole PCB layouts. This packaging format, combined with the device's inherent stability and protection features, makes it ideal for a wide range of applications including:

Industrial control systems benefit significantly from this regulator's robust design, particularly in programmable logic controllers (PLCs) and sensor interface circuits. Consumer electronics manufacturers leverage its compact form factor for powering microcontroller units (MCUs) and digital signal processors (DSPs) in portable devices. Automotive electronics systems utilize its thermal protection capabilities in engine control modules and onboard diagnostics (OBD) interfaces.

For embedded system designers, the device offers simplified power architecture through its minimal external component requirements. Unlike switching regulators that require complex peripheral circuits, this linear regulator only needs basic input/output capacitors for stable operation. This simplicity reduces overall system complexity while maintaining high reliability.

Tags: Linear Voltage Regulator, Fixed Output Regulator, TO-92-3 Package, Low Dropout Regulator, Power Management IC