L78L05A

Overview

The UMW L78L05A is a three-terminal positive voltage regulator belonging to the L78LxxA series. It provides a fixed output voltage of 5V with a maximum output current of 100mA. The device operates within an input voltage range up to 30V and features a power supply rejection ratio (PSRR) of 49dB at 120Hz. It has a typical static current of 2mA and supports surface-mount installation in an SO-8 package measuring 6.12 x 3.91mm with a height of 1.63mm. The component functions reliably across a working temperature range of -20°C to +120°C, with storage capabilities from -55°C to +150°C.

Feature Summary

• Integrates internal current limiting and thermal shutdown mechanisms for overload protection.
• Designed for local or on-card regulation to eliminate noise associated with single-point distribution.
• Capable of delivering up to 100mA output current when adequate heat dissipation is provided.

Applications

• Local or on-card voltage regulation
• Noise elimination in power distribution systems
• Replacement for Zener diode-resistor combinations

Procurement Notes

Verify the manufacturer designation as Shenzhen UMW Semiconductor Co., Ltd. Confirm the specific package variant matches the required SO-8 dimensions and pin configuration. Ensure the operating temperature range aligns with the system's environmental requirements. Cross-reference the part number against official datasheets to confirm active status and compliance with RoHS standards before finalizing procurement.

Selection Notes

Select this component for applications requiring a compact, fixed 5V source with moderate current demands. The SO-8 package suits space-constrained surface-mount designs. Consider thermal management strategies if continuous operation near the 100mA limit is expected. Verify that the input voltage remains within the specified maximum to ensure stable regulation and prevent device damage.

Part Context

This component is part of the L78LxxA series of linear regulators produced by UMW. It shares functional similarities with other industry-standard three-terminal positive regulators but is distinguished by its specific packaging and manufacturer specifications. The series is designed for general-purpose voltage regulation tasks where simplicity and reliability are prioritized over high-current capability.

Replacement Considerations

Compatible substitutes include the STMicroelectronics L78L05ACZ and Texas Instruments LM78L05ACM. Verify pinout compatibility and electrical parameters such as output current and voltage tolerance before substitution. Ensure the replacement package matches the existing footprint to avoid PCB redesign.