BU4945FVE-TR

Supervisors Overview

The BU4945FVE-TR is a single-channel voltage detector manufactured by ROHM Semiconductor. It operates within a supply voltage range of 0.7V to 7V and features a fixed detection threshold of 4.5V with ±1% precision. The device utilizes a CMOS push-pull/totem pole output configuration, eliminating the need for external pull-up resistors. It includes a hysteresis voltage defined as VDET multiplied by 0.05 to prevent output oscillation during threshold crossing. The component supports an operating temperature range from -40°C to 125°C and is housed in a compact VSOF5 package.

Supervisors Feature Summary

• CMOS push-pull output structure provides direct drive capability without requiring external pull-up components.
• High detection accuracy of ±1% ensures reliable monitoring of power supply levels.
• Integrated hysteresis function prevents output noise-induced false triggering at the detection threshold.

Supervisors Applications

• Monitoring 5V logic power rails in embedded systems
• Supervising battery voltage levels in portable devices
• Providing reset signals for microcontrollers during power-up sequences

Supervisors Procurement Notes

This component is officially classified as obsolete by the manufacturer. Verify current availability through authorized distributors or secondary markets. Confirm that replacement units match the original VSOF5 package dimensions and pinout. Ensure compliance with RoHS3 standards if required for your specific application environment.

Supervisors Selection Notes

Select this part when a fixed 4.5V threshold with high precision is required. The push-pull output simplifies circuit design compared to open-drain alternatives. Consider the wide operating temperature range for industrial applications. Evaluate the low standby current for battery-powered designs where power efficiency is critical.

Supervisors Part Context

The BU4945 series consists of standard voltage detectors designed for general-purpose power supervision. These ICs monitor input voltages and generate reset signals when thresholds are exceeded. The FVE suffix indicates the specific VSOF5 surface-mount package variant used for space-constrained PCB layouts.

Supervisors Replacement Considerations

BD5245G-1TR is documented as a recommended substitute with similar specifications. Note that the BD5245G-1 uses an SSOP5 package and an open-drain output, requiring external pull-up components unlike the push-pull BU4945FVE-TR.