BD45345G-TR

Overview

The BD45345G-TR is a CMOS voltage detector IC from ROHM Semiconductor, designed for monitoring single power supply lines. It features a fixed delay timer of 50 milliseconds and an open-drain output active low. The typical under-voltage detection threshold is 3.4V with a precision of ±1%. The device operates within a reset active voltage range of 0.95V to 10V and supports manual reset functionality. It consumes ultra-low current, approximately 0.80μA in the ON state and 0.85μA in the OFF state at VDET=4.8V. The component is housed in a compact SSOP5 package (2.9x2.8mm) and functions reliably across a temperature range of -40°C to +105°C.

Feature Summary

• Integrates a fixed 50ms delay timer to prevent false resets during power-up transients.
• Supports manual reset input for system initialization control.
• Features high-precision voltage detection with ±1% accuracy tolerance.
• Utilizes an open-drain output configuration compatible with various logic levels.

Applications

• Microprocessor and microcontroller power supply supervision
• Battery-operated equipment voltage monitoring
• Industrial control system reset circuits

Procurement Notes

Verify the specific suffix G-TR confirms the tape-and-reel packaging format required for automated assembly processes. Confirm that the RoHS compliance status aligns with regional environmental regulations for electronic components. Ensure the SSOP5 package dimensions match the target PCB footprint constraints. Validate the operating temperature range against the intended application environment specifications.

Selection Notes

Select this component when a fixed delay time is sufficient for the application's noise immunity requirements. Choose based on the 3.4V detection threshold matching the monitored rail voltage. Consider the manual reset feature if external initialization control is necessary. Evaluate the low standby current consumption for battery-powered designs requiring extended operational life.

Part Context

This part belongs to the BD45 series of voltage detectors, which are characterized by low power consumption and small package sizes. The series includes variants with different detection voltages and delay times. The BD45345G-TR specifically addresses applications requiring precise monitoring of 3.3V or 3.4V logic systems with guaranteed reset timing stability.

Replacement Considerations

The BD5234G-1 is documented as a recommended replacement with the same SSOP5 package and similar detection voltage. Note that the substitute offers adjustable delay time instead of fixed delay and lacks manual reset capability. Verify functional compatibility regarding output drive strength and hysteresis characteristics before substitution.