STMicroelectronics L7908CV-DG Linear Voltage Regulator -8V 1.5A TO-220

STMicroelectronics L7908CV-DG: High-Performance Linear Voltage Regulation for Demanding Applications

The STMicroelectronics L7908CV-DG stands as a testament to precision engineering in linear voltage regulation technology. Designed to deliver a fixed -8V output with a maximum current capacity of 1.5A, this negative voltage regulator combines robust performance with comprehensive protection features. Housed in a TO-220 package, it strikes an optimal balance between thermal efficiency and compact form factor, making it ideal for industrial control systems, automotive electronics, and advanced power management solutions.

Technical Excellence in Voltage Regulation

This fixed-output linear regulator operates with exceptional stability across its -35V maximum input voltage range. The device maintains precise output regulation with minimal dropout voltage (1.1V @ 1A typical), ensuring reliable performance even in fluctuating power environments. Its 60dB PSRR (Power Supply Rejection Ratio) at 120Hz demonstrates superior noise suppression capabilities, critical for maintaining signal integrity in sensitive analog circuits.

Advanced Protection Architecture

Engineered for reliability, the L7908CV-DG incorporates dual protection mechanisms: integrated over-temperature shutdown and robust short-circuit protection. These features work in tandem to prevent damage under fault conditions while maintaining operational stability across its 0°C to 125°C operating temperature range. The through-hole mounting configuration ensures mechanical durability in vibration-prone environments.

Key performance characteristics include:

• 3mA quiescent current for energy-efficient operation
• Excellent transient response through optimized internal compensation
• Wide thermal protection range for demanding applications

Industrial and Automotive Applications

With its negative voltage configuration and industrial-grade specifications, this regulator excels in applications requiring stable power delivery in challenging conditions. Common use cases include:

• Automotive power systems requiring negative voltage rails
• Industrial process control equipment
• Test and measurement instrumentation
• High-reliability embedded systems

The TO-220 package facilitates effective heat dissipation while maintaining compatibility with standard PCB assembly processes. This makes the L7908CV-DG particularly suitable for applications where thermal management and long-term reliability are critical.

Design Considerations and Implementation

When integrating this regulator into circuit designs, engineers should consider the following:

• Input/output capacitor selection for stability
• Thermal management through appropriate heatsinking
• Noise filtering for sensitive analog applications
• Proper PCB layout to minimize voltage drops

Compared to switching regulators, the L7908CV-DG offers simpler implementation with fewer external components, while maintaining the advantages of linear regulation including low output noise and excellent transient response.

Technical Specifications Overview

The L7908CV-DG represents STMicroelectronics' commitment to power management innovation, combining proven design principles with modern semiconductor technology to deliver reliable performance in demanding environments.

Tags: Linear Regulator, Negative Voltage Regulator, TO-220 Package, Power Management, Industrial Electronics