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Product Detailed Parameters
- Description：5V CONSTANT-VOLTAGE POWER SUPPLY
- Series：*
- Mfr：Sanyo
- Package：Bulk
- Output Configuration：-
- Output Type：-
- Number of Regulators：-
- Voltage - Input (Max)：-
- Voltage - Output (Min/Fixed)：-
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：-
- Current - Output：-
- Current - Quiescent (Iq)：-
- Current - Supply (Max)：-
- PSRR：-
- Control Features：-
- Protection Features：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The L78MS05J-A is a fixed positive standard linear voltage regulator manufactured by Sanyo. It provides a nominal output voltage of 5V with a maximum output current capability of 1A. The device utilizes a bipolar process and is housed in a TP-3 package, which corresponds to the TO-220 physical form factor. As a three-terminal regulator, it requires minimal external components for operation, integrating internal current limiting, thermal overload protection, and safe area compensation to ensure robust performance under varying load conditions.
Feature Summary
- Provides stable fixed positive voltage regulation
- Integrates internal short-circuit and thermal protection mechanisms
- Utilizes a robust three-terminal design for simplified circuit implementation
Applications
- General-purpose power supply circuits requiring regulated 5V rails
- Embedded systems and microcontroller power distribution
- Industrial control equipment power management
Procurement Notes
Verify the manufacturer origin carefully, as Sanyo Semiconductor assets were acquired by Onsemi. Confirm that the specific part number matches the original Sanyo datasheet specifications rather than generic equivalents. Ensure the package type aligns with the required thermal dissipation needs for the intended application current levels.
Selection Notes
Select this component when a reliable 1A fixed 5V source is needed without complex feedback networks. Consider the thermal resistance of the mounting environment, as linear regulation dissipates excess voltage as heat. Verify input voltage headroom requirements to maintain proper dropout voltage margins during peak load operations.
Part Context
This regulator belongs to the L78M series family, designed for medium-current applications. It serves as a direct replacement for older standard L78xx series regulators but offers improved reliability features. The series is widely recognized for its simplicity and cost-effectiveness in basic power regulation tasks across various electronic industries.
Replacement Considerations
Public confirmed substitute part numbers include L78M05, L78M05T, and TS78M05A. These alternatives share similar electrical characteristics and pinouts, facilitating direct board-level swaps provided thermal and voltage ratings are compatible.
