L4940V85

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

The L4940V85 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 output current capability of 1.5 A. The device features a very low dropout voltage, typically 0.5 V at rated load, with a maximum specified dropout of 0.9 V. It operates within an input voltage range of 9.5 V to 17 V, with a maximum absolute input rating of 30 V. The component is housed in a TO-220AB package (3-pin plus tab) and supports an operating junction temperature range from -40 °C to +150 °C.

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

• Incorporates internal protection mechanisms including thermal shutdown, short-circuit protection, reverse polarity protection, and anti-saturation circuitry.
• Designed for high efficiency in battery-powered equipment due to very low quiescent current and minimal input-to-output voltage drop.
• Offers precise fixed output voltage regulation suitable for industrial and consumer applications requiring stable power delivery.

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

• Secondary regulation for switch mode power supplies
• Distributed power systems with on-card voltage regulation
• Battery-powered equipment requiring extended battery life

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

Verify the specific suffix 'V85' confirms the 8.5 V fixed output variant. Ensure the package designation matches the required TO-220AB form factor. Confirm compliance with RoHS standards if environmental regulations apply. Check datasheet revisions for any updates to absolute maximum ratings or thermal characteristics before finalizing procurement specifications.

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

Select this component when a stable 8.5 V rail is required with up to 1.5 A load current. It is appropriate for applications where input voltage exceeds 9.5 V but remains below 30 V. Consider its thermal performance in TO-220 packaging for heat dissipation needs. Ideal for replacing older regulators in designs prioritizing low dropout and high reliability in consumer or industrial electronics.

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

The L4940V85 belongs to the L4940 series of low-dropout linear regulators. This family includes variants with different fixed output voltages such as 5 V and 12 V. The series shares common features like 1.5 A output current capability and robust internal protection circuits. These devices are widely used in general-purpose power management roles across various electronic systems.

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

Compatible substitutes include other L4940 series variants with different output voltages if system requirements change. Verify pin compatibility and thermal resistance values when considering alternative packages or manufacturers. Ensure replacement parts meet the same electrical specifications for dropout voltage and current handling capabilities.