L78L08ABD13TR

Overview

The L78L08ABD13TR is a three-terminal positive linear voltage regulator from the STMicroelectronics L78L series, housed in an SO-8 surface-mount package. It provides a fixed output voltage of 8 V with a maximum output current capability of 100 mA. The device features internal thermal overload and short-circuit protection, ensuring robust operation under fault conditions. It operates within a junction temperature range of -40 °C to +125 °C. Electrical characteristics include a typical quiescent current of 6 mA at 25 °C and a supply voltage rejection ratio of 45 dB at 120 Hz.

Feature Summary

• Incorporates internal current limiting and thermal shutdown mechanisms for inherent protection against overload and overheating.
• Requires no external components for basic regulation, simplifying circuit design and reducing bill of materials.
• Offers improved performance over Zener diode/resistor combinations with lower noise and reduced quiescent current.

Applications

• Local or on-card voltage regulation to eliminate distribution problems associated with single-point regulation.
• Replacement for Zener diode and resistor combinations in biasing circuits.
• Configuration with power pass elements to create high-current voltage regulators.

Procurement Notes

Verify that the specific ordering suffix matches the required package type and tape/reel specifications. Confirm the 'A' selection code corresponds to the ±4% output voltage tolerance requirement. Ensure the component grade meets environmental compliance standards such as ECOPACK if applicable to the manufacturing process.

Selection Notes

Select this part when a fixed 8 V output is required with up to 100 mA load current in a compact surface-mount form factor. The extended -40 °C to +125 °C operating range makes it suitable for industrial environments. Consider the SO-8 package's thermal resistance and copper area requirements for adequate heat dissipation during continuous operation.

Part Context

This component belongs to the L78Lxx family of low-power positive voltage regulators manufactured by STMicroelectronics. The family includes various output voltages and packages such as TO-92 and SOT-89. The L78L08 variant specifically targets applications requiring an 8 V rail with moderate current demands in space-constrained designs.

Replacement Considerations

Direct pin-compatible replacements within the same manufacturer's portfolio include other L78L08 variants with different package options (e.g., L78L08CD13TR) or selection codes (e.g., L78L08ACD13TR). Verify that any substitute maintains the required ±4% tolerance and SO-8 footprint.