L78L12A

Overview

The UMW L78L12A is a three-terminal positive linear voltage regulator belonging to the L78LxxA series. It provides a fixed output voltage of 12 V with a maximum output current capability of 100 mA. The device operates within an input voltage range of 14 V to 35 V and supports surface-mount installation in an SOIC-8 package. Key electrical parameters include a typical power supply rejection ratio (PSRR) of 49 dB, a maximum static current of 2 mA, and a maximum power dissipation of 500 mW. The component is designed for operation over an extended temperature range, supporting storage temperatures from -55°C to +150°C.

Feature Summary

• Incorporates internal circuitry for thermal shutdown and current limiting to ensure operational robustness under fault conditions.
• Designed for local or on-card regulation applications to eliminate noise and distribution issues associated with single-point regulation systems.
• Provides a stable fixed 12 V output suitable for low-power electronic circuits requiring precise voltage control.

Applications

• Local or on-card voltage regulation in embedded systems
• Power supply stages for portable battery-operated devices
• Noise-sensitive analog circuit biasing

Procurement Notes

Verify that the specific order references the UMW manufacturer designation and the L78L12A part number to distinguish it from generic equivalents. Confirm the package type is SOIC-8 and check RoHS compliance status against the latest datasheet. Ensure the supplier provides official documentation confirming the 100 mA output rating and thermal protection features before finalizing procurement.

Selection Notes

Select this component when a fixed 12 V output is required with a maximum load current of 100 mA. The SOIC-8 surface-mount package is suitable for space-constrained designs. Verify that the input voltage remains between 14 V and 35 V to maintain proper regulation. Consider the 500 mW power dissipation limit and implement adequate thermal management if the voltage drop across the regulator generates significant heat during operation.

Part Context

The L78L12A is part of the broader L78LxxA family of three-terminal positive regulators produced by UMW. This series shares common architectural features such as internal current limiting and thermal shutdown. While other variants in the family provide different fixed output voltages, the L78L12A specifically targets applications requiring a 12 V rail. It serves as a compact alternative to larger through-hole packages for modern surface-mount assembly processes.

Replacement Considerations

Compatible substitutes include the STMicroelectronics L78L12ACUTR and Texas Instruments LM78L12ACM/NOPB. These alternatives offer similar electrical characteristics but may differ in package style or pinout configuration. Verify pin compatibility and thermal performance before substituting to ensure circuit integrity.