L78S15CV

Overview

The L78S15CV is a three-terminal positive linear voltage regulator from the STMicroelectronics L78S series, housed in a TO-220 package. It provides a fixed output voltage of 15 V with an output current capability of up to 2 A when adequate heat sinking is utilized. The device accepts an input voltage range extending up to 35 V and operates within a junction temperature range of -40 °C to +125 °C. Internal circuitry includes short-circuit protection, thermal overload shutdown, and safe area protection.

Feature Summary

• Integrates internal current limiting and thermal shutdown mechanisms for robust operation under fault conditions.
• Provides local on-card regulation to eliminate distribution problems associated with single-point power supplies.
• Requires no external components for basic fixed voltage regulation functionality.

Applications

• Local or on-card voltage regulation for electronic circuits
• Replacement for Zener diode and resistor combinations
• General-purpose power supply sections requiring fixed 15 V output

Procurement Notes

Verify the specific suffix designation against official documentation, as variations may indicate different tape-and-reel packaging or temperature grades rather than functional changes. Confirm that the procurement channel sources directly from authorized distributors to ensure component authenticity and traceability. Cross-reference the part number with the latest datasheet revision to validate pinout compatibility and electrical specifications before integration into designs.

Selection Notes

Select this component when a fixed 15 V output at currents approaching 2 A is required in a through-hole TO-220 form factor. Ensure the application design incorporates sufficient thermal management, such as a heatsink, to sustain the maximum rated output current. Consider the input-to-output voltage differential to calculate power dissipation accurately and maintain operation within the specified safe operating area limits.

Part Context

This regulator belongs to the L78S family of three-terminal positive regulators designed for high-current applications compared to standard L78C or L78L series devices. The L78S series is engineered to deliver over 2 A of output current, making it suitable for more demanding power requirements while maintaining the simplicity of fixed-voltage regulation without external feedback networks.

Replacement Considerations

Compatible substitutes include other L78S series variants with identical pinouts but different fixed output voltages, provided the system requires a different rail. Verify that any replacement maintains the same TO-220-3 package footprint and meets the 2 A current carrying capacity and 35 V maximum input voltage ratings.