L4940P85

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

The L4940P85 is a three-terminal positive low-dropout voltage 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 operates within an input voltage range up to 17 V and features a typical dropout voltage of 400 mV at 0.5 A load. It is housed in a TO-220FP package and supports an operating junction temperature range from -40 °C to +150 °C.

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

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

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

• Battery-powered equipment requiring efficient power regulation
• Industrial control systems utilizing distributed supply architectures
• Consumer electronics needing on-card voltage regulation

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

Verify that the component matches the specific L4940P85 order code for the 8.5 V fixed output variant. Confirm the physical package corresponds to the TO-220FP form factor as specified in the datasheet. Ensure environmental compliance requirements align with ECOPACK lead-free specifications provided by the manufacturer.

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

Select this regulator when a stable 8.5 V rail is required for loads up to 1.5 A. Consider its low quiescent current for battery-operated designs where minimizing standby consumption is critical. Evaluate thermal resistance values relative to the expected ambient temperature and heat dissipation capabilities of the PCB layout.

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

This component belongs to the L4940 series of very low drop 1.5 A regulators. The series includes variants with fixed outputs of 5 V, 10 V, and 12 V. All members share similar internal protection circuits and are designed for applications demanding high efficiency and reliability in compact power management solutions.

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

Compatible substitutes within the same family include L4940V5 (5 V), L4940V10 (10 V), and L4940V12 (12 V). These parts maintain identical pinouts and protection features but differ in their fixed output voltage settings.