RS3221-3.3YF5

Overview

The RS3221-3.3YF5 is a fixed-output linear low-dropout regulator manufactured by Runic Technology, designed for efficient voltage regulation in compact electronic systems. This component provides a stable 3.3V output with a maximum continuous current capacity of 200mA, suitable for powering sensitive digital logic and analog circuits. It operates within an input voltage range up to 7.5V and features integrated protection mechanisms including overcurrent and thermal shutdown to ensure device safety under fault conditions. The regulator delivers high power supply rejection ratios of 48dB at 217Hz and 36dB at 1kHz, minimizing noise interference from the power source. Designed for surface-mount applications, it utilizes the SOT-23-5 package (SC-74A) to facilitate automated assembly and space-constrained PCB layouts. The device supports an enable control feature for power management optimization and functions reliably across a wide operating temperature range from -40°C to +85°C.

Feature Summary

• Integrated overcurrent and thermal shutdown protection mechanisms
• Enable pin functionality for precise power control
• High power supply rejection ratio for noise reduction

Applications

• Portable consumer electronics requiring stable 3.3V logic levels
• Battery-powered devices utilizing low-dropout regulation
• Embedded sensor modules and microcontroller power supplies

Procurement Notes

Verify that the specific suffix YF5 corresponds to the SOT-23-5 package configuration required for your design. Confirm RoHS3 compliance status if environmental regulations apply to your manufacturing process. Ensure input voltage does not exceed the 7.5V maximum rating during operation. Check datasheet specifications for thermal derating requirements based on ambient temperature conditions.

Selection Notes

Select this component when a fixed 3.3V output is required with moderate current demands up to 200mA. Consider the SOT-23-5 footprint constraints and verify compatibility with existing PCB silkscreen and pad designs. Evaluate thermal performance if the device will operate near the upper temperature limits or in enclosed spaces without adequate airflow.

Part Context

The RS3221 series represents Runic Technology's portfolio of low-power linear regulators optimized for portable applications. This family includes various output voltage options and package configurations to support diverse system architectures. The RS3221-3.3YF5 specifically addresses the common need for 3.3V rail generation in modern digital circuits, offering a balance between performance, size, and cost efficiency for mass-produced electronic goods.

Replacement Considerations

Cross-reference with other 200mA LDOs in SOT-23-5 packages featuring 3.3V fixed outputs. Verify pinout compatibility before substitution to prevent circuit damage. Compare PSRR specifications and quiescent current values to ensure equivalent noise performance and power efficiency in the target application.