BU4944F-TR

Supervisors Overview

The BU4944F-TR is a CMOS voltage detector IC manufactured by ROHM Semiconductor, designed for monitoring single-input power supply rails. It features a typical under-voltage detection threshold of 4.4 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 draws a circuit current of 0.55 μA at the off state (VDET=4.8V) and includes a hysteresis voltage defined as VDET x 0.05. The component utilizes an SOP-4 package, offers a CMOS output type with a low reset state, and functions reliably across an extended temperature range from -40°C to +125°C.

Supervisors Feature Summary

• CMOS voltage detection architecture providing high accuracy with ±1% precision
• Low static power consumption suitable for battery-operated systems
• Integrated hysteresis function to prevent output oscillation during threshold transitions

Supervisors Applications

• Portable electronic devices requiring efficient power management
• Embedded systems needing reliable brown-out protection
• Industrial control units operating in wide temperature environments

Supervisors Procurement Notes

Verify the obsolete status and last-time-buy availability through official ROHM channels before finalizing procurement plans. Confirm that the SOP-4 package dimensions and pinout align with existing PCB footprints. Ensure compliance with RoHS directives and check for any regional distribution restrictions or lead time constraints associated with end-of-life components.

Supervisors Selection Notes

Select this component when a fixed 4.4 V threshold is required without manual reset or watchdog timer functionality. The CMOS output interface simplifies integration with digital logic circuits. Consider the extended temperature rating for harsh environments. Evaluate the low standby current against system power budgets. Verify that the single-input monitoring capability meets the specific application requirements.

Supervisors Part Context

This part belongs to the BU49xx series of standard voltage detectors from ROHM Semiconductor. These ICs are engineered for supervisory applications where precise voltage monitoring is critical. The series typically excludes complex features like adjustable delays or watchdog timers, focusing instead on fundamental reset generation and reliability.

Supervisors Replacement Considerations

The BD5244G-1 is listed as a recommended replacement with similar specifications. Note differences in package type (SSOP5 vs SOP-4) and output structure (Open Drain vs CMOS). Verify pin compatibility and electrical parameter alignment before substitution.