BU45L294G-TL

Overview

The BU45L294G-TL is a fixed-delay voltage detector IC from the ROHM BU45 series, housed in an SSOP-3 package. It features a threshold voltage of 2.9 V with ±1% accuracy and an open-drain output. The device operates within a supply voltage range of 0.6 V to 6 V, consuming 2.8 µA at standby. It includes a fixed reset delay timer of 400 ms and offers a hysteresis voltage of VDET x 0.05. The component supports an operating temperature range from -40°C to +105°C.

Feature Summary

• Integrated fixed delay timer eliminates the need for external capacitors
• High precision detection with ±1% threshold voltage accuracy
• Ultra-low current consumption suitable for battery-powered applications

Applications

• Portable electronic devices requiring low power monitoring
• Microprocessor system reset circuits
• Battery-operated equipment supervision

Procurement Notes

Verify the Not Recommended for New Designs (NRND) status before integration into new products. Confirm RoHS compliance and moisture sensitivity levels during handling. Ensure the SSOP-3 package dimensions match the target PCB footprint. Check for available ECAD models for simulation compatibility.

Selection Notes

Select this component for designs prioritizing minimal external component count due to the built-in delay timer. The open-drain output requires an external pull-up resistor. Consider the 400 ms delay duration against system startup requirements. Verify that the 2.9 V threshold aligns with the monitored rail's minimum operating voltage.

Part Context

This part belongs to the BU45/BU46 series of CMOS voltage detectors known for high accuracy and low current. It serves as a supervisory circuit for maintaining system stability by detecting under-voltage conditions. The specific model provides a fixed response time without adjustable timing components.

Replacement Considerations

BD5229G-1TR is listed as a similar specification replacement with adjustable delay and SSOP-5 packaging.