L7808CD2T

Overview

The L7808CD2T is a fixed-output linear voltage regulator from the STMicroelectronics L78 series, designed for positive voltage regulation. It provides a nominal output of 8 V with a maximum continuous output current capability of 1.5 A. The device supports an input voltage range up to 35 V and operates within a junction temperature range of 0 °C to +125 °C. Key electrical parameters include a typical line regulation of 80 mV and load regulation of 100 mV. It features a quiescent current of approximately 4.3 mA and offers a typical power supply rejection ratio (PSRR) of 56 dB.

Feature Summary

• Integrated internal current limiting, thermal shutdown, and safe area protection for robust operation.
• Eliminates distribution problems associated with single-point regulation through local on-card voltage control.
• Provides stable fixed positive voltage output suitable for various electronic circuit applications.

Applications

• Local on-card voltage regulation in embedded systems.
• General-purpose positive voltage stabilization in consumer electronics.
• Power supply conditioning for low-power integrated circuits.

Procurement Notes

Verify the specific suffix 'D2T' against official STMicroelectronics documentation to confirm the exact package type and tape-and-reel configuration. Ensure compatibility with surface-mount assembly processes. Cross-reference the part number with authorized distributors to confirm availability and authenticity, as variations exist within the L78 family regarding packaging and thermal characteristics.

Selection Notes

Select this component when a fixed 8 V output is required with moderate current demands up to 1.5 A. Consider the D2PAK package for improved thermal dissipation compared to smaller SMD options. Evaluate the input-to-output voltage differential to ensure adequate heat sinking is provided, as linear regulators dissipate excess energy as heat. Verify that the application does not require ultra-low quiescent current, as this device draws approximately 4.3 mA.

Part Context

This component belongs to the L78 series of three-terminal positive linear regulators manufactured by STMicroelectronics. The series is widely recognized for its reliability and simplicity in fixed-voltage applications. The L7808 variant specifically targets 8 V output requirements. The D2T designation typically indicates a surface-mount D2PAK package with tape-and-reel delivery, distinguishing it from through-hole TO-220 versions like the L7808CV.

Replacement Considerations

Compatible substitutes include other manufacturers' equivalents such as MC78M08 or LM7808, provided pinouts and thermal performance are verified. For direct pin-compatible replacements within the same package, consider the L7808CDT or L7808CDTR from STMicroelectronics. Ensure any replacement maintains the 1.5 A current rating and 35 V maximum input voltage specifications.