L7809ACD2T

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The L7809ACD2T is a three-terminal positive linear voltage regulator from the STMicroelectronics L78 series. It provides a fixed 9 V output with a maximum continuous output current of 1.5 A. The device accepts an input voltage range from 11 V to 35 V. Key electrical parameters include a line regulation of 80 mV and load regulation of 100 mV. It features a typical power supply rejection ratio (PSRR) of 56 dB at 120 Hz. The component operates within a junction temperature range of 0 °C to +125 °C and has a quiescent current of 4.3 mA.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Integrates internal thermal overload protection, short-circuit protection, and safe area protection for robust operation.
• Provides local on-card voltage regulation to eliminate distribution issues associated with single-point regulation systems.
• Offers high line and load regulation performance suitable for stable power delivery in electronic circuits.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• General-purpose positive voltage regulation in electronic equipment
• Local on-card regulation for distributed power architectures
• Power supplies for microcontroller-based systems

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix 'D2T' corresponds to the D2PAK surface-mount package and tape-and-reel packaging format. Confirm that the 'A' designation indicates the 2% output voltage tolerance variant. Ensure compatibility with the required thermal management solution for 1.5 A operation. Cross-reference the manufacturer part number with official STMicroelectronics documentation to confirm active status and pinout configuration.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a fixed 9 V output is required with up to 1.5 A load capability in a surface-mount form factor. The D2PAK package facilitates efficient heat dissipation compared to smaller SOT packages. Consider the 11 V minimum input requirement and ensure sufficient headroom for the desired load current. The 2% tolerance version offers tighter voltage accuracy than standard variants.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the L78xx family of three-terminal positive regulators, widely used for fixed-voltage applications. The L78L series offers lower current (100 mA), while the standard L78 series supports up to 1.5 A. The D2PAK package distinguishes it from through-hole TO-220 versions, enabling automated surface-mount assembly processes.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Equivalent parts include the L7809CD2T (standard tolerance) or L7809ABD2T (extended temperature). Verify pinout compatibility and thermal resistance characteristics before substitution. Alternative manufacturers may offer pin-compatible regulators with similar electrical specifications.