L78L09A

Overview

The UMW L78L09A is a fixed positive linear voltage regulator belonging to the L78Lxx series. It provides a nominal output voltage of 9 V with a maximum output current capability of 100 mA. The device supports an input voltage range from 11 V to 30 V and operates within a temperature range of -25°C to +70°C. Internal circuitry includes overcurrent protection, thermal shutdown, and safe area compensation to ensure robust operation under varying load conditions.

Feature Summary

• Fixed 9 V output voltage regulation
• Internal overcurrent and thermal protection mechanisms
• Compact SOT-89 surface-mount package

Applications

• Battery-powered equipment power supplies
• Audio and video devices
• Communication equipment
• Security monitoring systems

Procurement Notes

Verify the specific suffix against official UMW documentation to confirm pinout compatibility and exact electrical tolerances. Confirm that the requested package matches the required PCB footprint. Ensure the operating environment remains within the specified temperature limits for reliable performance.

Selection Notes

Select this component when a stable 9 V supply is required at currents up to 100 mA. Consider the thermal dissipation capabilities of the SOT-89 package relative to the expected voltage drop and load current. Verify input voltage stability to maintain regulation within specified limits.

Part Context

This part belongs to the L78Lxx family of three-terminal positive regulators manufactured by UMW Semiconductor. These components are designed as direct replacements for standard industry equivalents in low-power applications requiring simple voltage regulation without complex external circuitry.

Replacement Considerations

Cross-reference with other manufacturers' L78L09 variants to verify pinout alignment and thermal characteristics before substitution.