BD4944G-TR

Overview

The BD4944G-TR is a standard CMOS voltage detector IC from ROHM Semiconductor, designed for processor supervision. It features a fixed under-voltage detection threshold of 4.4V with a precision of ±1%. The device provides an active-low CMOS output and operates within a reset active voltage range of 0.95V to 10V. It includes a hysteresis voltage defined as VDET x 0.05. The circuit current is specified at 0.60μA (at VS=4.8V) in the on state and 0.85μA in the off state. It is housed in a compact SSOP5 package.

Feature Summary

• Provides precise under-voltage monitoring with a fixed 4.4V detection threshold
• Features low power consumption suitable for battery-operated systems
• Delivers an active-low CMOS output signal for direct interface with digital logic

Applications

• Processor supervisor circuits requiring stable voltage monitoring
• Battery-powered electronic devices needing under-voltage protection
• General-purpose voltage detection in embedded systems

Procurement Notes

Verify the specific ordering part number BD4944G-TR against the manufacturer's latest documentation to ensure compatibility with design requirements. Confirm that the supply status aligns with project timelines, as this component may be classified as not recommended for new designs. Cross-reference the SSOP5 package dimensions and electrical specifications with the official datasheet before finalizing procurement decisions.

Selection Notes

Select this component when a fixed 4.4V threshold is required for under-voltage detection. The CMOS output type simplifies integration with microcontrollers and digital logic gates. Consider the low operating current for applications where power efficiency is critical. Ensure the input voltage range covers the operational needs up to 10V. Verify that the lack of manual reset or watchdog timer functions meets the system safety requirements.

Part Context

The BD4944G-TR belongs to the BD49 series of standard voltage detectors manufactured by ROHM Semiconductor. This series focuses on providing reliable supervision for digital circuits with minimal external components. The device is part of a broader family of voltage monitors offering various thresholds and output configurations to suit different application constraints.

Replacement Considerations

The BD5244G-TR is listed as a similar level replacement with the same package. Note that the BD5244G-TR features an open-drain output and programmable reset delay, which differs from the BD4944G-TR's CMOS output and fixed timing. Verify functional compatibility before substitution.