R1173H331D-T1-FE

Product Overview

The R1173H331D-T1-FE is a Nisshinbo Micro Devices Inc. linear voltage regulator intended for positive fixed-output power conversion. It provides a 3.3 V regulated output from an input voltage up to 6 V and supports an output current of 1 A. The device is supplied in a surface-mount SOT-89-5 package and includes an enable control, over-current protection, and over-temperature protection. With a 100 µA quiescent current and 70 dB power-supply rejection at 1 kHz, it is suited to compact single-rail power architectures where a fixed 3.3 V rail must be generated from a higher DC source while maintaining a controlled output under load and thermal stress.

Key Features

• Fixed 3.3 V positive output with 1 A output current rating.
• Input voltage rating supports operation up to 6 V.
• Enable control allows the regulator output to be switched on or off.
• Over-current and over-temperature protection help manage abnormal load and thermal conditions.
• 100 µA quiescent current supports low idle-power budget considerations.
• 70 dB PSRR at 1 kHz reduces input-supply noise transfer to the output.
• SOT-89-5 surface-mount package supports compact board layouts.

Applications

• Battery-powered or regulated 3.3 V logic subsystems requiring a fixed linear output.
• Embedded control boards where a single 1 A load needs a regulated 3.3 V rail.
• Power inputs that must be stepped down from up to 6 V DC.
• Compact devices using enable-controlled power sequencing for a fixed output.

Design & Procurement Notes

When selecting the R1173H331D-T1-FE for a design, confirm that the available input voltage remains within the 6 V maximum rating and that the load does not exceed 1 A. The fixed 3.3 V output and SOT-89-5 package suit compact layouts, but the regulator dissipates power as heat, so input-output voltage difference and load current should be evaluated against the -40°C to 85°C operating range. The enable control can be used for controlled startup or shutdown, while over-current and over-temperature protections provide fault response. PSRR and quiescent current should also be considered when the regulator feeds noise-sensitive or battery-conscious circuitry.