LM317LZ-TR Adjustable Linear Voltage Regulator - 100mA Output | STMicroelectronics

Precision Voltage Regulation for Modern Electronics

The LM317LZ-TR from STMicroelectronics represents a new standard in adjustable linear voltage regulation technology. This compact yet powerful device delivers precise output voltage control while maintaining exceptional thermal stability and protection features. Designed for engineers seeking reliable power management solutions, this regulator combines advanced technical specifications with robust operational safeguards.

Key Technical Advantages

Operating within an impressive 1.2V to 37V output range, the LM317LZ-TR accommodates diverse electronic design requirements. Its 40V maximum input voltage capability ensures compatibility with various power sources while maintaining 100mA output current capacity. The device's 80dB PSRR (Power Supply Rejection Ratio) at 120Hz guarantees minimal noise interference, making it ideal for sensitive analog circuits and precision instrumentation.

Advanced protection systems form the core of its reliability features. Integrated over-current, over-temperature, and short-circuit safeguards ensure uninterrupted operation even in challenging environments. The TO-92-3 package combines compact form factor with excellent thermal dissipation properties, supporting continuous operation across the full 0°C to 125°C temperature range.

Design Flexibility and Applications

Engineers benefit from the LM317LZ-TR's remarkable versatility across multiple domains. Its adjustable output makes it suitable for:

• Precision instrumentation and measurement equipment
• Industrial control systems and automation devices
• Battery charging circuits with variable voltage requirements
• Audio equipment requiring clean power supplies
• Embedded systems with customized voltage needs

The device's through-hole mounting configuration simplifies PCB integration while ensuring mechanical stability. Its low quiescent current operation enhances energy efficiency in battery-powered applications, making it a preferred choice for portable electronics designers.

Performance Characteristics

What truly distinguishes the LM317LZ-TR is its combination of precision and durability. The regulator maintains ±1.5% load and line regulation accuracy while delivering consistent performance across varying thermal conditions. The built-in thermal shutdown mechanism activates at 125°C, preventing damage from overheating without requiring external monitoring circuitry.

For power supply designs seeking minimal component count, this regulator requires only two external resistors to set the output voltage. The internal current limiting circuit adjusts automatically to load conditions, eliminating the need for additional protection components in most applications.

Technical Implementation

Implementing the LM317LZ-TR in circuit designs follows standard linear regulator practices while offering unique advantages. Designers should consider:

• Selecting appropriate input/output capacitors for stability
• Calculating resistor divider values using Vout = 1.25V(1 + R2/R1)
• Ensuring adequate PCB copper area for thermal management
• Considering input protection diodes for inductive load applications

With its comprehensive protection systems and wide operating range, this regulator simplifies power supply design while meeting demanding reliability requirements. The device complies with industry-standard quality certifications, ensuring consistent performance across production batches.

Future-Proof Engineering

As electronics continue evolving toward greater integration and miniaturization, the LM317LZ-TR provides a reliable foundation for both traditional and emerging applications. Its combination of established performance characteristics with modern protection features ensures design longevity in rapidly changing technological environments. Whether used in prototyping or mass production, this regulator offers the stability and precision required for demanding engineering projects.

Tags: linear regulator, adjustable voltage, power management, industrial electronics, circuit protection