BU4840F-TR

Supervisors Overview

The BU4840F-TR is a CMOS voltage detector IC manufactured by ROHM Semiconductor, designed for power supply support applications. It features a fixed under-voltage detection threshold of 4.0 V with a precision of ±1%. The device operates within a reset active voltage range of 0.7 V to 7 V and supports a maximum supply voltage of 7 V. It utilizes an open-drain output type with a low-active reset state. The component functions without manual reset or watchdog timer capabilities. It is housed in a 4-SOP package and maintains a typical operating current of 0.40 μA at Vdet=4.8V.

Supervisors Feature Summary

• CMOS technology ensures ultra-low current consumption for extended battery life.
• Fixed threshold voltage provides precise monitoring without external adjustment components.
• Open-drain output interface allows flexible connection to various logic families.

Supervisors Applications

• Power supply supervision in portable electronic devices
• Microcontroller system reset generation
• Battery-powered equipment voltage monitoring

Supervisors Procurement Notes

Verify the specific suffix 'TR' indicates tape-and-reel packaging when sourcing. Confirm the manufacturer designation as ROHM Semiconductor to ensure authenticity. Check for end-of-life status as some variants may be discontinued. Validate RoHS compliance requirements against project specifications. Ensure the 4-SOP package dimensions match the target PCB footprint constraints.

Supervisors Selection Notes

Select this component when a fixed 4.0 V threshold is required for single-channel voltage monitoring. Consider the open-drain output compatibility with the target system logic levels. Evaluate the low operating current suitability for energy-constrained designs. Verify that the absence of a watchdog timer meets the application safety requirements. Compare package size constraints against available board space.

Supervisors Part Context

This part belongs to the BU4840 series of standard voltage detectors from ROHM Semiconductor. It serves as a supervisory circuit for maintaining system stability during power fluctuations. The series typically includes variants with different threshold voltages and package options to accommodate diverse design needs.

Supervisors Replacement Considerations

BD5240G-1TR is listed as a similar specification replacement option. Verify pinout compatibility and electrical parameter alignment before substitution. Confirm package differences between SOP4 and SSOP5 formats impact the mechanical design.