BD45391G-TR

Overview

The BD45391G-TR is a CMOS voltage detector IC manufactured by Rohm Semiconductor. It features a fixed reset delay time of 100 msec and an under-voltage detection threshold of 3.9V with ±1% precision. The device operates within a reset active voltage range of 0.95 to 10V and utilizes an open-drain output type. Key electrical characteristics include a circuit current of 0.80μA (on) and 0.85μA (off) at Vdet=4.8V, with no hysteresis voltage specified in the primary data. It lacks manual reset, watchdog timer, and automotive certification capabilities.

Feature Summary

• Built-in fixed 100 msec reset delay timer for stable power-on sequencing
• High accuracy voltage detection with ±1% threshold precision
• Low power consumption suitable for battery-operated applications
• Open-drain output configuration for flexible logic interfacing

Applications

• Portable electronic devices requiring reliable power monitoring
• Battery-powered systems needing low quiescent current supervision
• General-purpose microprocessor reset circuits
• Embedded systems with fixed delay requirements

Procurement Notes

Verify component authenticity through authorized distributors as this part has been announced for discontinuation. Confirm supply status via official Rohm channels or last-time-buy notices. Ensure compatibility with existing design parameters before procurement due to potential end-of-life constraints.

Selection Notes

Select this component when a fixed 100 msec delay and 3.9V threshold are required. Consider alternatives if adjustable delay, manual reset, or automotive qualification is needed. Verify package availability in 5-SSOP format and ensure input voltage ranges match system specifications.

Part Context

This voltage detector belongs to Rohm's BD45xxx series of CMOS supervisors. It is designed for general-purpose power management in consumer electronics. The series typically offers high accuracy and low current consumption. This specific model is characterized by its fixed delay and open-drain output, distinguishing it from variants with adjustable delays or additional features like watchdog timers.

Replacement Considerations

The BD5243G-1TR is listed as a similar level replacement with the same SSOP5 package. However, verify functional differences such as adjustable delay versus fixed delay and precision variations before substitution.