LM1086IS-3.3

Overview

The LM1086IS-3.3/NOPB is a fixed positive low-dropout linear regulator manufactured by Texas Instruments, designed to deliver up to 1.5 A of output current. It provides a stable 3.3 V output voltage with high accuracy and features a typical dropout voltage of 1.3 V at maximum load. The device operates within an input voltage range of 4.5 V to 27 V and supports a wide junction temperature range from -40°C to +125°C. Packaged in a surface-mount D2PAK (TO-263) housing, it integrates internal current limiting and thermal shutdown protection for robust performance in space-constrained applications requiring efficient power regulation.

Feature Summary

• Fixed 3.3 V output voltage with high precision regulation
• Capable of delivering up to 1.5 A continuous output current
• Low dropout voltage specification ensures efficient operation under varying load conditions
• Integrated thermal shutdown and current limit protection mechanisms

Applications

• Portable battery-powered equipment requiring efficient voltage regulation
• Post-regulation stages for switching power supplies
• Embedded systems and microcontroller power distribution networks
• Industrial control modules operating in extended temperature environments

Procurement Notes

Verify the complete ordering part number includes the NOPB suffix to ensure lead-free compliance and RoHS adherence. Confirm the package variant matches the required TO-263 form factor for PCB layout compatibility. Check manufacturer datasheets for specific thermal resistance values relevant to your copper pad design. Ensure input voltage constraints are respected to avoid exceeding absolute maximum ratings during transient events.

Selection Notes

Select this component when a fixed 3.3 V rail is needed with moderate current demands up to 1.5 A. Consider the dropout voltage characteristics relative to your minimum input voltage to maintain regulation. Evaluate thermal management requirements based on the power dissipation calculated from the voltage differential and load current. Compare against adjustable variants if flexible output voltages are required instead of fixed options.

Part Context

This device belongs to the LM1086 family of low-dropout regulators, which also includes adjustable versions and other output voltage options such as 1.8 V, 2.5 V, and 5 V. The IS suffix denotes the surface-mount D2PAK package, distinguishing it from through-hole TO-220 variants like the CT series. The family is characterized by bipolar process technology and is widely used in general-purpose power management applications across industrial and consumer sectors.

Replacement Considerations

Direct substitutes include LM1086CSX-3.3/NOPB and LM1086IS-3.3/NOPB from Texas Instruments or National Semiconductor. Cross-manufacturer equivalents may exist but require verification of pinout compatibility and electrical parameter alignment. Always consult official replacement guides to ensure functional equivalence without redesigning the surrounding circuitry.