L4940D2T85

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

The L4940D2T85-TR is a three-terminal positive linear regulator from the L4940 series, manufactured by STMicroelectronics. It provides a fixed output voltage of 8.5 V with a maximum continuous output current of 1.5 A. The device utilizes a D2PAK surface-mount package and supports an input voltage up to 17 V. Key electrical characteristics include a typical dropout voltage of 400 mV at 0.5 A and 900 mV at 1.5 A. Quiescent current ranges from 5 mA to 50 mA depending on load conditions.

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

• Integrated thermal shutdown protection prevents damage during overheating events.
• Built-in short-circuit protection limits output current to safe levels.
• Reverse polarity protection safeguards the component against incorrect input connections.

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

• Battery-powered equipment requiring low consumption
• Industrial control systems
• Consumer electronics power supplies

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

Verify the specific order code L4940D2T85-TR matches the required 8.5 V output and D2PAK package configuration. Confirm that the supplier documentation explicitly references the L4940xx datasheet for accurate electrical parameters. Ensure compliance with environmental standards such as RoHS3 if applicable to the project requirements.

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

Select this component when a stable 8.5 V rail is needed with high current capability in a compact surface-mount form factor. Consider the thermal resistance values provided in the datasheet to determine appropriate heatsinking or PCB copper area requirements for the expected power dissipation under maximum load conditions.

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

This part belongs to the L4940 series of very low drop 1.5 A regulators. The series includes variants with different fixed output voltages (5 V, 10 V, 12 V) and packages (TO-220, TO-220FP). The D2PAK variant offers a balance between thermal performance and mounting density suitable for automated assembly processes.

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

L4940D2T5-TR (5 V output)

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

What is the maximum reverse input voltage allowed?

The absolute maximum rating for reverse input voltage is -15 V, dependent on the specific output voltage variant and load resistance.

Does the L4940D2T85-TR include overcurrent protection?

Yes, the device features internal current limiting and short-circuit protection to safeguard against excessive load currents.