BU4943F-TR

Supervisors Overview

The BU4943F-TR is a CMOS voltage detector IC manufactured by ROHM Semiconductor, designed for supervisory circuit applications. It features a fixed threshold voltage of 4.3 V with a precision of ±1%. The device operates within a supply voltage range of 0.7 V to 7 V and supports a maximum operating temperature of +125 °C. Key electrical parameters include a typical operating current of 0.40 μA at VDET=4.8V and a static current of 550 nA. The output type is CMOS with a low active state, and it lacks manual reset or watchdog timer functions. The component is housed in an SOP-4 package.

Supervisors Feature Summary

• CMOS voltage detection with high accuracy
• Low power consumption design
• Wide operating voltage range support

Supervisors Applications

• Portable equipment power management
• Battery-powered system supervision
• Microprocessor reset circuits

Supervisors Procurement Notes

Verify the specific suffix and package configuration against the official datasheet before ordering, as variations exist within the series. Confirm end-of-life status and last-time-buy availability through authorized distributors. Ensure compatibility with existing PCB footprint and thermal requirements during procurement planning.

Supervisors Selection Notes

Select this component when a fixed 4.3 V threshold is required for single-input voltage monitoring. Consider the CMOS output drive capability and lack of hysteresis adjustment. Evaluate the SOP-4 package constraints against available board space. Compare against similar specifications if automotive qualification or adjustable delay features are needed.

Supervisors Part Context

This part belongs to the BU4943F standard voltage detector series from ROHM Semiconductor. It is specifically engineered for low-voltage detection in portable devices. The series emphasizes low current consumption and compact packaging solutions for modern electronic designs requiring reliable power supervision.

Supervisors Replacement Considerations

The BD5243G-1TR is listed as a recommended replacement with similar specifications. Note differences in package type (SSOP5 vs SOP4) and output structure (open drain vs CMOS). Verify pinout compatibility and electrical parameter alignment before substitution.