STMicroelectronics

L7809CD2T

L7809CD2T Description

The L7809CD2T is a fixed-output positive linear voltage regulator from STMicroelectronics, designed to deliver a stable 9V output at up to 1.5A of continuous current. Housed in a D2PAK (TO-263) surface-mount package, this regulator is engineered for high-efficiency power management in demanding applications. With an input voltage range up to 35V and a low dropout voltage of 2V (typical at 1A), it ensures reliable performance even under fluctuating input conditions. The device operates across a wide temperature range (0°C to 125°C), making it suitable for industrial and automotive environments.

L7809CD2T Features

• Fixed 9V Output: Provides a precise, stable voltage for consistent system performance.
• High Current Capacity: Supports up to 1.5A output current, ideal for powering medium-load circuits.
• Robust Protection: Includes over-temperature and short-circuit protection for enhanced reliability.
• Low Quiescent Current: 8 mA typical Iq minimizes power loss in standby modes.
• Excellent PSRR: 55dB at 120Hz ensures superior noise rejection for sensitive applications.
• Wide Input Range: Accepts up to 35V input, accommodating various power sources.
• RoHS3 Compliant & REACH Unaffected: Meets environmental and regulatory standards.

L7809CD2T Applications

The L7809CD2T is particularly suited for:

• Industrial Control Systems: Powering sensors, actuators, and control logic requiring stable 9V supply.
• Automotive Electronics: Used in infotainment systems, dashboards, and lighting modules due to its wide operating temperature range.
• Consumer Electronics: Ideal for audio amplifiers, set-top boxes, and other devices needing reliable voltage regulation.
• Embedded Systems: Provides clean power to microcontrollers, FPGAs, and peripheral circuits.
• Power Supplies: Acts as a post-regulator in switch-mode power supplies to reduce ripple and noise.

Conclusion of L7809CD2T

The L7809CD2T stands out as a high-performance linear regulator, offering a balance of high current capability, robust protection, and low dropout voltage. Its D2PAK package ensures efficient thermal dissipation, while its wide input range and industrial-grade temperature tolerance make it versatile for harsh environments. Although marked as obsolete, it remains a reliable choice for legacy designs or applications requiring proven stability. For engineers seeking a 9V regulator with 1.5A output, the L7809CD2T delivers a compelling combination of performance and durability.