BU4344G-TR

Overview

The BU4344G-TR is a CMOS low voltage detector manufactured by ROHM Semiconductor, designed for supervisory circuit applications. It features an adjustable reset delay timer and operates within a supply voltage range of 0.7 V to 7 V. The device detects under-voltage conditions with a typical threshold of 4.4 V and maintains a detection precision of ±1%. Packaged in an SSOP-5 format, it supports a maximum power dissipation of 540 mW and functions reliably across an extended temperature range from -40°C to +125°C.

Feature Summary

• CMOS output type provides direct logic interface compatibility
• Adjustable reset delay timer allows customizable timing control
• High accuracy voltage detection ensures reliable system monitoring

Applications

• Portable equipment requiring low voltage supervision
• Battery-powered systems needing under-voltage protection
• General electronic circuits requiring reset signal generation

Procurement Notes

Verify the current lifecycle status before procurement, as this component may be designated as Not Recommended for New Designs (NRND). Confirm that the SSOP-5 package dimensions align with existing PCB footprints. Ensure the 4.4 V threshold meets specific circuit requirements. Check RoHS compliance documentation if environmental regulations apply. Validate availability through authorized distributors due to potential end-of-life constraints.

Selection Notes

Select this component when a fixed 4.4 V threshold is required alongside an adjustable delay feature. Consider the CMOS output capability for driving digital inputs directly. Evaluate the 550 nA operating current against strict power budget constraints. Compare the SSOP-5 package size against available board space. Assess the ±1% precision requirement against system tolerance levels.

Part Context

This part belongs to the BU42(43)xxG series of standard voltage detectors. It serves as a dedicated supervisory IC for monitoring single-input power rails. The device integrates internal hysteresis to prevent output oscillation during threshold transitions. It is distinct from watchdog-enabled variants within the broader product family.

Replacement Considerations

The BD5244G-1 is documented as a replacement with the same pinout and package. Verify that the open-drain output of the substitute matches the circuit design, as the original uses a CMOS output.