BU4840G-TR

Supervisors Overview

The BU4840G-TR is a single-channel voltage detector manufactured by ROHM Semiconductor, designed for supervisory circuit applications. It operates within a supply voltage range of 0.7 V to 7 V and features a fixed detection threshold of 4 V with ±1% accuracy. The device utilizes an open-drain output configuration and provides a low-active reset signal without manual reset or watchdog timer capabilities. It is housed in a compact 5-pin SSOP package (SC-74A/SOT-753) and supports surface-mount installation. The component functions reliably across an extended temperature range from -40°C to +125°C.

Supervisors Feature Summary

• Provides precise voltage monitoring with a fixed 4V threshold and high accuracy
• Features low-power operation suitable for battery-supplied systems
• Delivers active-low reset signal via open-drain output interface

Supervisors Applications

• Portable electronic devices requiring power management supervision
• Microprocessor system reset circuits
• Battery-operated equipment monitoring

Supervisors Procurement Notes

Verify the specific suffix G-TR against the official datasheet to confirm the SSOP-5 package type and taping format. Confirm RoHS compliance status and check for any end-of-life notifications, as this component may be marked as not recommended for new designs. Ensure the supplier documentation matches the manufacturer's current specifications before procurement.

Supervisors Selection Notes

Select this component when a fixed 4V detection threshold is required for single-channel voltage supervision. It is appropriate for designs needing low quiescent current and an open-drain output compatible with various logic levels. Consider the operating temperature range and package constraints during PCB layout. Verify that the absence of a watchdog timer meets the system safety requirements.

Supervisors Part Context

This part belongs to the BU48xx series of standard voltage detectors from ROHM Semiconductor. These ICs are engineered for simple reset generation and power supply monitoring in consumer and industrial electronics. The series offers various threshold voltages to accommodate different rail requirements while maintaining consistent package dimensions and electrical characteristics across the family.

Supervisors Replacement Considerations

BD5241G-1 is listed as a similar level replacement with the same package and comparable threshold voltage.