BU4842FVE-TR

Supervisors Overview

The BU4842FVE-TR is a CMOS voltage detector IC from Rohm Semiconductor, designed for supervising single-channel power supply voltages. It features an open-drain output and provides a low-active reset signal without manual reset or watchdog timer capabilities. The device operates within a supply voltage range of 0.7 V to 7 V and detects under-voltage conditions with a typical threshold of 4.2 V. It exhibits high accuracy with a detection precision of ±1% and includes hysteresis set at VDET x 0.05 to prevent oscillation. The component supports surface-mount installation in a VSOF-5 package and functions reliably across an extended temperature range of -40°C to +125°C.

Supervisors Feature Summary

• Provides simple reset and power-on reset functionality via an open-drain output interface
• Delivers precise voltage monitoring with ±1% detection accuracy and defined hysteresis
• Operates effectively across a wide industrial temperature range up to 125°C

Supervisors Applications

• Monitoring microprocessor power supply rails for undervoltage conditions
• Supervisory circuits in portable electronic devices requiring low current consumption
• Industrial control systems needing reliable voltage detection in harsh environments

Supervisors Procurement Notes

Verify the obsolete status and last-time-buy availability through official Rohm channels before procurement planning. Confirm that the VSOF-5 package dimensions align with existing PCB footprints. Ensure compliance with RoHS3 specifications for environmental regulations. Cross-reference the specific suffix with manufacturer documentation to confirm pinout compatibility if substituting into existing designs.

Supervisors Selection Notes

Select this component when a single-channel voltage supervisor with open-drain output is required. The 4.2 V threshold suits standard 3.3 V and 5 V logic systems. Consider the low static current for battery-operated applications. Verify that the absence of a watchdog timer meets system safety requirements. Ensure the operating voltage range covers the minimum expected supply levels during brown-out events.

Supervisors Part Context

This part belongs to the BU4842 series of standard voltage detectors manufactured by Rohm Semiconductor. The series offers various threshold voltages and package options to accommodate different design constraints. The BU4842FVE-TR specifically utilizes the VSOF-5 package for compact surface-mount integration. It serves as a fundamental building block for power management integrity in digital circuits.

Supervisors Replacement Considerations

BD5242G-1TR is a recommended replacement with similar specifications but differs in package type (SSOP5 vs VSOF5) and includes adjustable delay features.