L4940D2T10-TR

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

The L4940D2T10-TR is a three-terminal positive linear regulator from the L4940 series, manufactured by STMicroelectronics. It provides a fixed 10 V output with a maximum continuous current of 1.5 A and operates within an input voltage range up to 17 V. The device utilizes a D²PAK surface-mount package and features very low dropout characteristics, typically 450 mV at 1 A load. Electrical specifications include a quiescent current of 8 mA at light loads and supply voltage rejection of 62 dB at 120 Hz under full load conditions.

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

• Provides precise fixed 10 V output for stable power regulation
• Features very low dropout voltage to minimize energy loss in battery-powered equipment
• Includes internal thermal shutdown, short-circuit protection, and reverse polarity protection

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

• On-card regulation in distributed power supply systems
• Battery-powered equipment requiring extended operational life
• Industrial and consumer electronic applications

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

Verify the specific ordering code matches the required output voltage and package type. Confirm that the D²PAK footprint aligns with the target PCB layout. Ensure compliance with environmental directives such as RoHS3 if applicable to the manufacturing region. Cross-reference the datasheet revision history for any recent mechanical or electrical updates before finalizing component selection.

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

Select this component when a fixed 10 V rail is required with high current capability. Consider the thermal resistance values provided in the datasheet to determine appropriate heatsinking requirements for the operating environment. Evaluate the line and load regulation specifications against the sensitivity of the downstream circuitry to ensure performance meets system stability criteria.

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 offers multiple fixed output voltages including 5 V, 8.5 V, and 12 V variants. These devices are designed for applications where efficiency and low heat dissipation are critical, utilizing advanced semiconductor processes to achieve high performance in standard TO-220 and D²PAK packages.

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 typical dropout voltage at a 1 A load?

The typical dropout voltage is 450 mV at an output current of 1 A.

Does the device offer protection against reverse input connections?

Yes, the L4940 series includes built-in reverse polarity protection.