LD2982BM33R

Overview

The LD2982BM33R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 3.3 V output with a maximum load current of 50 mA. The device operates within an input voltage range supporting its low dropout characteristics and maintains a quiescent current of approximately 100 µA. It is housed in a compact SOT-23-5 surface-mount package. The regulator functions reliably across an extended temperature range from -40 °C to +125 °C, ensuring performance in demanding environments.

Feature Summary

• Ultra-low dropout voltage operation for efficient power management
• Low noise output suitable for sensitive analog circuits
• Integrated inhibit function for power control
• Compatible with low ESR capacitors for stability

Applications

• Battery-powered portable devices requiring low quiescent current
• RF modules and communication equipment needing low noise regulation
• Embedded systems with TTL-compatible shutdown requirements
• Medical instrumentation requiring stable low-voltage supplies

Procurement Notes

Verify the complete part number including suffixes such as 'R' for reel packaging against official STMicroelectronics documentation. Confirm RoHS compliance status and specific tape-and-reel quantities if applicable. Ensure the ordering code matches the exact output voltage and package variant required for your design to avoid compatibility issues.

Selection Notes

Select this component when a fixed 3.3 V output at 50 mA is required with minimal voltage drop. Consider the SOT-23-5 package size constraints and thermal dissipation capabilities. Evaluate the need for the inhibit pin functionality versus simpler regulator options. Ensure input voltage remains within specified limits to maintain regulation under all load conditions.

Part Context

This part belongs to the LD2982 series of very low drop and low noise voltage regulators. The series includes variants with different output voltages and inhibit configurations. The LD2982BM33R specifically denotes the 3.3 V fixed output version with B-grade matching and R-suffix reel packaging. It complements other LDOs in the portfolio offering higher current or adjustable outputs.

Replacement Considerations

Direct substitutes include other LD2982 series variants with compatible pinouts and electrical characteristics. Verify that alternative parts support the same 50 mA load current and 3.3 V output. Check for equivalent inhibit functionality and low ESR capacitor compatibility. Ensure thermal performance and package dimensions match the existing PCB layout.