BU4240FVE-TR

Overview

The BU4240FVE-TR is a voltage detector IC manufactured by Rohm Semiconductor, designed for monitoring single-channel power supply voltages. It features an adjustable delay timer and operates within a reset active voltage range of 0.7 to 7 V. The typical under-voltage detection voltage is 4.0 V with a precision of ±1%. The device utilizes an open-drain output type and maintains a low reset active state. It functions reliably across a temperature range of -40°C to 125°C. The component is housed in a VSOF5 package with dimensions of 1.6x1.6 mm and a thickness of 0.6 mm.

Feature Summary

• Provides simple reset or power-on reset functionality with an adjustable delay timer.
• Features an open-drain output capable of sinking specified currents for reliable interfacing.
• Operates over an extended industrial temperature range suitable for diverse environments.

Applications

• Monitoring microprocessor power supply rails for undervoltage conditions
• Implementing programmable reset delays in embedded systems
• Protecting battery-powered devices from deep discharge

Procurement Notes

Verify the specific suffix and package variant against current manufacturer documentation, as availability status may have changed. Confirm that the VSOF5 footprint matches your PCB design constraints. Check for end-of-life notices or last-time-buy recommendations before finalizing procurement plans to ensure long-term supply stability.

Selection Notes

Select this component when a fixed 4.0 V threshold with high precision is required alongside customizable reset timing. Compare the open-drain output drive capability against load requirements. Ensure the operating voltage range covers the system's minimum and maximum supply levels without exceeding the absolute maximum ratings defined in the datasheet.

Part Context

This part belongs to the BU42xx series of voltage detectors from Rohm, which offers various threshold voltages and package options. The FVE suffix typically denotes the VSOF5 surface-mount package. Related parts in the family include BU4241FVE-TR and BU4242FVE-TR, which share similar functional characteristics but differ in detection thresholds.

Replacement Considerations

The BD5240G-1 is documented as a recommended replacement with the same pinout. Verify compatibility regarding package differences (SSOP5 vs VSOF5) and slight variations in output current capabilities and operating temperature ranges before substitution.

FAQ

What is the typical accuracy of the detection voltage?

The detection voltage precision is typically ±1%.

Does the BU4240FVE-TR support manual reset?

No, the device does not feature a manual reset function.