L78S75CV

Overview

The L78S75CV is a three-terminal positive linear voltage regulator from the STMicroelectronics L78Sxx series, providing a fixed 7.5V output with a maximum current capability of 2A. It operates within an input voltage range of 10.5V to 35V and features low dropout characteristics relative to standard L78 devices. The component includes internal protections such as thermal shutdown, overload protection, and safe area protection. It is housed in a TO-220 package with three pins for through-hole mounting and supports an operating temperature range from 0°C to 150°C.

Feature Summary

• Provides local on-card regulation to eliminate distribution problems associated with single-point regulation.
• Embeds internal current limiting, thermal shut-down, and safe area protection for robust operation.
• Designed primarily as a fixed voltage regulator but can be adapted for adjustable outputs using external components.

Applications

• Local on-card voltage regulation in electronic circuits.
• General-purpose power supply systems requiring stable positive voltage.
• Applications necessitating high current delivery with integrated thermal and short-circuit protection.

Procurement Notes

Verify the specific output voltage tolerance and thermal resistance requirements against the official STMicroelectronics datasheet before procurement. Confirm that the TO-220 package dimensions and pinout align with the target PCB footprint. Ensure adequate heat sinking is planned, as delivering the full 2A output current requires proper thermal management to maintain junction temperatures within the specified 0°C to 150°C operating range.

Selection Notes

Select the L78S75CV when a fixed 7.5V output at up to 2A is required with high reliability. This device is suitable for applications where the input voltage remains between 10.5V and 35V. Consider this part over standard L78 variants if higher current capacity is needed, or over L78M variants if lower current suffices. Verify that the system design accommodates the thermal dissipation inherent to linear regulation at the expected load conditions.

Part Context

The L78S75CV belongs to the L78Sxx series of three-terminal positive regulators, which are designed to deliver higher output currents compared to the standard L78xx series. This series is available in various packages including TO-220, TO-220FP, D²PAK, and DPAK. The L78Sxx series maintains the core benefits of the L78 family, such as internal protection features and ease of use, while offering enhanced current handling capabilities for demanding power management applications.

Replacement Considerations

Compatible substitutes include other L78Sxx series regulators with different fixed output voltages, such as L78S12CV or L78S15CV, provided the voltage requirement matches. Standard L78xx series regulators like L7812CV may serve as alternatives if lower current (1A) is acceptable. Ensure any replacement maintains the same TO-220-3 package and electrical specifications relevant to the application.