REG101NA-3.3/3K

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

The REG101NA-3.3/3K is a fixed positive low-dropout (LDO) linear voltage regulator manufactured by Texas Instruments, originally under the Burr-Brown brand. It provides a stable 3.3V output with a maximum dropout voltage of 0.13V at rated load. The device supports up to 100mA of output current and operates within an ambient temperature range of -40°C to +85°C. It utilizes NMOS pass transistor technology for efficient regulation. The component is housed in a five-pin SOT-23 surface-mount package, designated as PDSO5, suitable for space-constrained printed circuit board applications requiring precise voltage control.

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

• Fixed 3.3V output voltage ensures consistent power supply stability without external adjustment components.
• Low dropout characteristic of 0.13V allows operation with minimal input-to-output voltage differential.
• NMOS pass transistor design enables high efficiency and fast transient response capabilities.

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

• Portable battery-powered equipment requiring stable 3.3V logic levels
• Embedded systems with strict space limitations utilizing SOT-23 packaging
• Noise-sensitive analog circuits needing regulated DC power sources

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

Verify the manufacturer origin, as this part was originally produced by Burr-Brown before its acquisition by Texas Instruments. Confirm the specific suffix /3K indicates the reel quantity configuration if required for assembly line integration. Ensure the datasheet matches the exact electrical specifications for the 3.3V variant, as other voltage options exist within the same family. Cross-reference the pinout diagram to confirm compatibility with existing PCB footprints.

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

Select this regulator when a fixed 3.3V rail is necessary with minimal quiescent current consumption. The 100mA current limit suits moderate load applications but may require higher-current alternatives for heavy loads. Consider the SOT-23 thermal performance for enclosed designs. Verify that the input voltage remains sufficiently above 3.43V to maintain regulation under all operating conditions and load transients.

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

This component belongs to the REG101 series of low-noise, low-dropout linear regulators. The series includes various fixed output voltages and adjustable versions. The NA suffix typically denotes the plastic SOT-23 package variant. The /3K suffix specifies the tape and reel packaging format, distinct from cut-tape or tube options found in other distribution channels.

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

The REG101NA-3.3/250 serves as a direct functional substitute, differing primarily in packaging quantity rather than electrical characteristics. Both parts share identical pinouts, dropout voltages, and current capabilities. Verify that the replacement source confirms the same NMOS architecture and thermal ratings to ensure seamless integration into existing designs.