BU4921FVE-TR

Supervisors Overview

The BU4921FVE-TR is a standard voltage detector manufactured by Rohm Semiconductor, currently designated as a last-time buy product. It features a CMOS output type with a low-active reset state and operates within a reset active voltage range of 0.7 to 7 V. The typical under-voltage detection voltage is 2.1 V with a precision of ±1%. Hysteresis is defined as VDET x 0.05. Circuit current consumption is 0.40 μA (ON) and 0.55 μA (OFF) at VDET=4.8V. It lacks manual reset, watchdog timer, and automotive qualification. The device is housed in a VSOF5 package.

Supervisors Feature Summary

• CMOS output interface providing low-active reset signaling
• Integrated hysteresis function defined as a percentage of the detection voltage
• Low power consumption suitable for battery-operated applications

Supervisors Applications

• Portable electronic devices requiring voltage supervision
• Battery-powered systems needing under-voltage protection
• General-purpose circuit monitoring where low standby current is critical

Supervisors Procurement Notes

This component is officially classified as a last-time buy item by the manufacturer. Procurement should be limited to final replacement needs or legacy system maintenance. Verify that the VSOF5 package matches your existing footprint requirements. Confirm RoHS compliance status through official documentation before integration into new production runs.

Supervisors Selection Notes

Select this part only if the specific 2.1 V threshold and CMOS output characteristics align with system requirements. Note that the recommended replacement BD5221G-1 utilizes an open-drain output and SSOP5 package, necessitating schematic and layout adjustments. Ensure compatibility with the 0.7 to 7 V operating range and verify thermal performance within the specified temperature limits.

Supervisors Part Context

The BU4921FVE-TR belongs to Rohm's standard voltage detector family, designed for simple supervisory functions without complex timing features. It serves as a cost-effective solution for basic power management tasks in consumer electronics. The trailing '-TR' indicates tape-and-reel packaging for automated assembly processes.

Supervisors Replacement Considerations

The BD5221G-1 is listed as a similar specification alternative. However, it uses an SSOP5 package instead of VSOF5 and offers an open-drain output rather than CMOS. Designers must account for these physical and electrical differences during migration.