BU4211FVE-TR

Overview

The BU4211FVE-TR is a voltage detector IC from Rohm Semiconductor designed for monitoring single power supply rails. It features an adjustable reset delay timer and an open-drain output active low. The device operates within a supply voltage range of 0.7 V to 7 V with a typical under-voltage detection threshold of 1.1 V. It offers high precision accuracy of ±1% and includes hysteresis voltage defined as VDET multiplied by 0.05. The component supports a wide operating temperature range from -40°C to 125°C and is housed in a VSOF-5 surface-mount package.

Feature Summary

• Provides simple reset or power-on reset functionality with an adjustable delay timer controlled by an external resistor.
• Features an open-drain output configuration that asserts a low signal when the monitored voltage falls below the detection threshold.
• Incorporates built-in hysteresis to prevent output oscillation during voltage transitions near the detection point.

Applications

• Microcontroller system supervision
• Memory backup circuit monitoring
• General-purpose voltage level detection

Procurement Notes

Verify the exact suffix and packaging type against the manufacturer's current documentation, as distribution listings may vary. Confirm RoHS compliance status and lead times directly with authorized suppliers, noting that availability may be limited due to end-of-life status. Ensure the selected variant matches the required detection voltage and package dimensions for your specific design constraints.

Selection Notes

Select this component when a low-cost, single-channel voltage supervisor with adjustable timing is required. The open-drain output allows flexibility in interfacing with various logic families. Consider the ±1% accuracy and wide temperature range for industrial applications. Verify that the external resistor value for the delay timer fits within the specified resistance limits for reliable operation.

Part Context

This part belongs to the BU42xxFVE series of voltage detectors from Rohm Semiconductor. These devices are designed for general-purpose power management applications requiring simple supervision without complex communication interfaces. The series typically shares similar pinouts and functional characteristics, differing primarily in detection thresholds and package options.

Replacement Considerations

BD5211G-1 is listed as a recommended replacement with the same pinout. Verify compatibility regarding package differences (VSOF-5 vs SSOP-5) and electrical specifications before substitution.