BU4342F-TR

Overview

The BU4342F-TR is a CMOS supervisory circuit manufactured by ROHM Semiconductor, designed for low-voltage detection with a fixed threshold of 4.2V. It operates within a supply voltage range of 0.7V to 7V and features an adjustable reset delay timer. The device utilizes a four-pin SOP package and maintains a typical operating current of 550nA. It provides high accuracy with a detection precision of ±1% and includes hysteresis voltage defined as VDET multiplied by 0.05. The component supports a maximum operating temperature of 125°C and delivers a low-level output current of 3.3mA.

Feature Summary

• CMOS architecture enabling ultra-low power consumption suitable for battery-operated systems
• Adjustable reset delay timer allowing customizable response timing via external components
• Fixed under-voltage detection threshold ensuring precise monitoring of power supply integrity

Applications

• Portable electronic devices requiring reliable power management
• Battery-powered equipment needing low-voltage cutoff protection
• General-purpose microcontroller reset circuits in consumer electronics

Procurement Notes

Verify the specific suffix and package variant against the official datasheet to ensure compatibility with design requirements. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer. Check for obsolescence notices or last-time-buy statuses before finalizing procurement plans.

Selection Notes

Select this component when a fixed 4.2V detection threshold is required without manual reset functionality. Consider the adjustable delay feature if system startup stability needs to be managed. Ensure the SOP-4 package fits the available PCB space and that the CMOS output interface matches the downstream logic requirements.

Part Context

This part belongs to the BU43xx series of voltage detectors from ROHM Semiconductor. These devices are engineered for compact, low-power applications where precise voltage monitoring is critical. The series typically offers various threshold options and packaging styles to accommodate different design constraints.

Replacement Considerations

BD5242G-1 is listed as a recommended replacement with the same pinout configuration. Verify package dimensions and electrical characteristics such as output drive capability and operating temperature range before substitution.