STMicroelectronics

L7809ABV-DG

L7809ABV-DG Description

The L7809ABV-DG is a fixed-output linear voltage regulator from STMicroelectronics, designed to deliver a stable 9V output at up to 1.5A of continuous current. Housed in a TO-220AB package, this through-hole-mount IC is engineered for robustness, featuring over-temperature and short-circuit protection to ensure reliable operation under demanding conditions. With a 35V maximum input voltage and a typical dropout voltage of 2V @ 1A, it is well-suited for applications requiring efficient voltage regulation. Though marked as obsolete, it remains a viable choice for legacy designs due to its ROHS3 compliance and REACH-unaffected status.

L7809ABV-DG Features

• Fixed 9V Output: Ensures consistent voltage regulation without adjustable components.
• High Current Capacity: Supports 1.5A output current, ideal for powering medium-load circuits.
• Wide Input Range: Accepts up to 35V input, accommodating fluctuating supply voltages.
• Low Dropout: 2V typical dropout at 1A minimizes power dissipation.
• Built-in Protections: Over-temperature and short-circuit safeguards enhance durability.
• Low Quiescent Current: 6 mA Iq improves efficiency in standby modes.
• High PSRR: 61dB at 120Hz ensures excellent noise rejection for sensitive applications.
• Through-Hole Mounting: Simplifies assembly in prototyping or industrial systems.

L7809ABV-DG Applications

The L7809ABV-DG excels in scenarios demanding stable 9V power:

• Industrial Control Systems: Powers sensors, actuators, and control logic with reliable voltage.
• Consumer Electronics: Used in audio amplifiers, set-top boxes, and legacy devices.
• Automotive Auxiliary Circuits: Suitable for non-critical 12V-to-9V conversion (e.g., dashboard displays).
• Test & Measurement Equipment: Provides clean power for precision analog circuits.
• Retro Computing: Ideal for restoring or maintaining vintage electronics requiring 9V rails.

Conclusion of L7809ABV-DG

While obsolete, the L7809ABV-DG remains a dependable choice for 9V regulation, offering a balance of high current output, robust protections, and ease of integration. Its TO-220AB package and through-hole design make it accessible for prototyping and repairs, though designers should consider modern alternatives for new projects. For legacy systems or cost-sensitive applications, this regulator delivers proven performance with minimal external components.