FT531JA

Overview

The FT531JA is a fixed positive linear voltage regulator manufactured by Fremont Micro Devices Ltd. It provides a stable 3.3V output with a maximum current capability of 250mA. The device features a low dropout voltage of 0.4V at 100mA and operates within an input voltage range up to 6V. Key electrical specifications include a quiescent current of 36µA and power supply rejection ratios of 72dB at 1kHz and 60dB at 10kHz. It is housed in a compact SOT-23-5 package suitable for surface mount applications.

Feature Summary

• Compact SOT-23-5 surface mount packaging designed for space-constrained PCB layouts
• Integrated overcurrent protection functionality for circuit safeguarding
• Enable control pin allows for efficient power management and system shutdown

Applications

• Portable battery-powered electronic devices requiring regulated power supplies
• Embedded systems utilizing microcontrollers or logic circuits
• Consumer electronics with strict spatial limitations on the mainboard

Procurement Notes

Verify component authenticity through authorized distributors due to obsolete status. Confirm RoHS3 compliance and MSL level 1 handling requirements during storage. Cross-reference datasheet revisions to ensure compatibility with existing design specifications before finalizing procurement orders.

Selection Notes

Select this regulator when a fixed 3.3V rail is required with moderate current demands. Evaluate thermal dissipation needs based on the voltage differential between input and load. Consider the enable pin feature if power sequencing or standby modes are integral to the system architecture.

Part Context

This component belongs to the FT531 series of low-dropout regulators from Fremont Micro Devices Ltd. The series is engineered for applications where board area is critical, offering high performance in minimal footprints. The FT531JA specifically denotes the 3.3V output variant within this family.

Replacement Considerations

Public confirmed substitute part numbers: None available.