BU4843F-TR

Supervisors Overview

The BU4843F-TR is a CMOS voltage detector IC manufactured by ROHM Semiconductor, designed for monitoring power supply voltages. It features a fixed under-voltage detection threshold of 4.3V with a precision of ±1%. The device operates within a reset active voltage range of 0.7V to 7V and utilizes an open-drain output type. Key electrical characteristics include a circuit current of 0.40μA in the ON state and 0.55μA in the OFF state at VDET=4.8V. Hysteresis is set at VDET x 0.05. It supports a minimum operating temperature of -40°C and a maximum of 125°C. The component is housed in an SOP-4 package.

Supervisors Feature Summary

• CMOS technology ensures low power consumption suitable for battery-operated applications.
• Fixed threshold voltage detection provides reliable system reset without external components.
• Open-drain output allows flexible interfacing with various logic families.

Supervisors Applications

• Portable electronic devices requiring voltage supervision
• Battery-powered systems needing under-voltage protection
• General-purpose microcontroller reset circuits

Supervisors Procurement Notes

Verify end-of-life status as the BU4843F series is listed as obsolete or not recommended for new designs. Confirm availability through authorized distributors or last-time buy channels. Ensure compatibility with existing PCB footprints if replacing older inventory. Check RoHS compliance documentation for environmental regulations. Validate supply chain stability before finalizing design specifications.

Supervisors Selection Notes

Select this component when a fixed 4.3V threshold is required for voltage monitoring. Consider the SOP-4 package size constraints during layout planning. Evaluate the ±1% precision against system tolerance requirements. Compare current consumption specs with other ROHM detectors like the BD5243G-1 if lower power is needed. Ensure the open-drain output matches the target logic level requirements.

Supervisors Part Context

The BU4843F-TR belongs to ROHM's standard voltage detector family, specifically the BU48xx series. These ICs are designed for simple, cost-effective power management solutions. The 'TR' suffix indicates tape and reel packaging for automated assembly. This series complements other ROHM products like the BD52xx series, offering similar functionality in different packages.

Supervisors Replacement Considerations

The BD5243G-1 is listed as a similar specification replacement with an SSOP-5 package. Verify pinout compatibility and package dimensions before substitution. The BD5243G-1 offers adjustable delay and slightly different current specs. Ensure the replacement meets all thermal and electrical requirements of the original design.