BU4821FVE-TR

Supervisors Overview

The BU4821FVE-TR is a standard voltage detector manufactured by Rohm Semiconductor, currently designated as End-of-Life (Last Time Buy). It features an under-voltage detection threshold of 2.1V with ±1% precision. The device operates within a reset active voltage range of 0.7V to 7V and utilizes an open-drain output type with a low-active reset state. It lacks manual reset, watchdog timer, and automotive qualification capabilities. Typical circuit current consumption is 0.40μA in the ON state and 0.55μA in the OFF state at VDET=4.8V. Hysteresis is set at VDET x 0.05. It is housed in an SSOP5 package and supports a temperature range from -40°C to 125°C.

Supervisors Feature Summary

• Provides precise under-voltage monitoring with high accuracy for system supervision
• Features low power consumption suitable for battery-operated applications
• Includes built-in hysteresis to prevent output oscillation during threshold transitions

Supervisors Applications

• Portable electronic devices requiring low standby current
• Battery-powered equipment needing reliable power-fail detection
• General-purpose industrial control systems operating within specified voltage ranges

Supervisors Procurement Notes

This component is officially classified as Last Time Buy or End-of-Life by the manufacturer. Procurement should be limited to final replacement needs only, as future supply is not guaranteed. Verify RoHS compliance status and confirm the specific ordering suffix matches required packaging before acquisition. Cross-reference official datasheets for exact pinout and electrical characteristics to ensure compatibility with existing designs.

Supervisors Selection Notes

Select this part when a fixed 2.1V threshold with high precision is required. It is suitable for designs prioritizing low quiescent current over advanced features like watchdog timers. Ensure the application does not require automotive-grade reliability or manual reset functionality. Consider the SSOP5 package constraints for PCB layout and thermal management requirements.

Supervisors Part Context

The BU4821FVE-TR belongs to Rohm's standard voltage detector family, designed for simple supervisory functions. It serves as a legacy component being phased out in favor of newer alternatives like the BD5221G-1 series. The device integrates essential monitoring capabilities into a compact surface-mount package, targeting cost-sensitive consumer and industrial markets where high-volume production is no longer supported.

Supervisors Replacement Considerations

The BD5221G-1 is listed as a similar specification replacement with recommended status. Verify package differences and slight variations in current consumption and precision before substitution.