R1191L033D-TR

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

The R1191L033D-TR is a fixed-output low-dropout (LDO) linear voltage regulator manufactured by Nisshinbo Micro Devices Inc. It provides a fixed output voltage of 3.3 V with a maximum continuous output current of 300 mA. The device supports an input voltage range from 3.5 V to 16 V and operates within a temperature range of -40°C to +85°C. Key electrical specifications include a typical power supply rejection ratio (PSRR) of 70 dB, a line regulation of 0.02 %/V, and a load regulation of 50 mV. The regulator features a dropout voltage of approximately 1 V at full load and maintains a quiescent current of 50 µA. It is housed in a compact SOT-23-5 surface-mount package.

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

• Integrates manual ECO mode shift functionality to optimize power consumption during light-load conditions.
• Includes built-in reverse current protection to prevent backflow when the input voltage drops below the output level.
• Provides comprehensive internal protection mechanisms against over-temperature, short-circuit currents, and excessive power dissipation.

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

• Battery-powered portable electronic devices requiring efficient power management
• Embedded systems utilizing microcontrollers or sensors with stable 3.3 V logic requirements
• Industrial control modules operating under variable input voltage conditions

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

Verify the specific suffix codes on the component marking to ensure compatibility with your design requirements. Confirm that the ordering information matches the exact package type and output voltage tolerance specified in the official datasheet. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components. Ensure compliance with RoHS directives if required for your target market regulations.

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

Select this component when a stable 3.3 V rail is needed from higher voltage sources up to 16 V. The low quiescent current makes it suitable for battery-operated applications where standby power loss must be minimized. The inclusion of reverse current protection allows for safe operation in systems with multiple power domains or capacitive loads. Verify thermal performance calculations based on the expected power dissipation in the SOT-23-5 package.

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

This device belongs to the R1191 series of LDO regulators from Nisshinbo Micro Devices Inc., formed through the merger of Ricoh Microdevices and New Japan Radio. The series is designed for general-purpose power management in consumer electronics and industrial equipment. The R1191L variant specifically denotes the package and feature set optimized for standard surface-mount assembly processes.

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

Direct substitutes within the same family include other R1191L variants with different fixed output voltages, such as R1191L030D-TR or R1191L035D-TR, provided the voltage requirement differs. Ensure any replacement maintains the same 300 mA output current capability and SOT-23-5 footprint for mechanical compatibility.