78M09 – 7809 – L78M09 – 9V Positive Voltage Regulator IC SMD TO 252 DPAK Package

78M09 – 7809 – L78M09 – 9V Positive Voltage Regulator IC SMD TO 252 DPAK Package

The 78M09 (also known as 7809 or L78M09) is a fixed +9V positive linear voltage regulator designed to provide a stable and reliable +9V DC output for a wide range of electronic applications. It is part of the 78xx family of positive voltage regulators, widely used in power supply circuits, embedded systems, and analog electronics.

This SMD version comes in a TO-252 (DPAK) surface-mount package, offering good thermal performance while saving PCB space. The regulator includes built-in current limiting, thermal shutdown, and short-circuit protection, ensuring safe and reliable operation.

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Applications

• +9V regulated power supplies
• Dual-polarity (±) power supply systems
• Analog and op-amp circuits
• Audio amplifiers and signal processing circuits
• Industrial control systems
• Measurement and instrumentation equipment
• Embedded systems and power modules

Features

• Fixed Output Voltage: +9V DC
• Regulator Type: Positive linear voltage regulator
• Package: TO-252 (DPAK) SMD
• Output Current: Up to 500mA (typical for 78M series, with proper heatsinking)
• Built-in thermal shutdown and current limiting protection
• Short-circuit protected
• Good line and load regulation
• Requires minimal external components
• Compact SMD package with good heat dissipation
• High reliability and stable performance