BU4909G-TR

Supervisors Overview

The BU4909G-TR is a voltage detector IC manufactured by ROHM Semiconductor, designed for monitoring power supply voltages in electronic systems. It operates within a supply voltage range of 0.7 V to 7 V and features a typical under-voltage detection threshold of 0.9 V with ±1% precision. The device utilizes a CMOS output type with a low active state and provides an L-output current capability of 3.3 mA at low voltage and 6.5 mA at high voltage. It functions reliably across a temperature range of -40°C to 125°C and is housed in an SSOP5 package measuring 2.9x2.8 mm with a thickness of 1.25 mm.

Supervisors Feature Summary

• CMOS output structure providing low active state reset signals
• High precision voltage detection with ±1% accuracy tolerance
• Wide operating supply voltage range from 0.7 V to 7 V
• Extended industrial temperature rating spanning -40°C to 125°C

Supervisors Applications

• Microprocessor power supply monitoring
• Portable battery-powered equipment supervision
• Multi-output power system oversight

Supervisors Procurement Notes

Verify the specific ordering suffix TR for reel packaging configuration. Confirm RoHS compliance status as indicated in official documentation. Check supply status carefully, as this component may be designated Not Recommended for New Designs (NRND). Ensure the SSOP5 package dimensions match the target PCB footprint requirements before finalizing procurement decisions.

Supervisors Selection Notes

Select this component when a precise 0.9 V detection threshold is required for low-voltage monitoring applications. The CMOS output interface suits digital logic integration without additional pull-up components. Consider the wide temperature range for harsh environment deployments. Evaluate the NRND status against long-term production lifecycle requirements and potential obsolescence risks.

Supervisors Part Context

This part belongs to the BU49xx series of supervisory circuits from ROHM Semiconductor. These devices are engineered for reliable voltage monitoring in portable and desktop electronics. The series emphasizes low power consumption and compact packaging solutions suitable for space-constrained printed circuit board designs.

Supervisors Replacement Considerations

The BD5209G-1 is identified as a replacement option with the same SSOP5 package. Verify that the open-drain output of the substitute matches the circuit design requirements, as the BU4909G uses a CMOS output.