78M09

Overview

The EVVO 78M09 is a fixed negative linear voltage regulator designed to provide a stable -9V DC output. It operates with an input voltage range typically extending from -10.5V to -35V, ensuring regulation under varying supply conditions. The device delivers a maximum continuous output current of 1A and includes internal protection mechanisms such as thermal overload shutdown and safe operating area (SOA) limiting. Packaged in standard through-hole configurations like TO-220 or TO-263, it serves as a reliable power management component for generating negative rails in mixed-signal electronic circuits.

Feature Summary

• Provides a fixed -9V regulated output voltage
• Includes internal thermal overload protection
• Features safe operating area (SOA) protection
• Supports continuous output current up to 1A

Applications

• Power supplies for operational amplifier circuits requiring negative rails
• Mixed-signal systems needing stable negative voltage references
• Industrial control equipment power distribution

Procurement Notes

Verify the specific package variant and suffix code upon ordering, as these determine pinout compatibility and mounting style. Confirm that the supplier provides original manufacturer documentation to ensure authenticity. Check for RoHS compliance requirements if applicable to your assembly process. Ensure adequate heat sinking is planned for high-current applications to maintain thermal stability.

Selection Notes

Select this component when a stable -9V rail is required for analog signal processing. Ensure the input voltage remains within the specified minimum and maximum limits to prevent dropout or damage. Consider thermal resistance and ambient temperature when determining the need for a heatsink, especially near the 1A current limit. Verify that the load current does not exceed the rated maximum continuous output.

Part Context

This part belongs to the family of standard three-terminal linear voltage regulators, specifically those providing negative output voltages. It is functionally comparable to industry-standard parts like the LM79xx series, offering similar pinouts and electrical characteristics. These regulators are widely used in legacy and modern designs alike for simple, low-noise negative voltage generation.

Replacement Considerations

Direct pin-compatible replacements include the LM7909, MC7909, and UA7909. When substituting, verify that the replacement part meets or exceeds the original current and voltage ratings. Ensure thermal performance characteristics are compatible with the existing heatsinking solution.