BD46241G-TR

Overview

The BD46241G-TR is a voltage detector IC from ROHM Semiconductor, designed for monitoring supply voltages with high precision. It features a fixed reset delay time of 100 ms and operates within a detection voltage range of 0.95 V to 10 V. The device offers a typical under-voltage detection threshold of 2.4 V with a precision of ±1%. It utilizes an open-drain output type and supports manual reset functionality. The component is available in an SSOP-5 package and is rated for operation between -40°C and +105°C.

Feature Summary

• Integrates a built-in counter timer circuit that eliminates the need for external capacitors for delay time setting.
• Provides high-accuracy voltage detection with a typical precision of ±1% across the operating range.
• Features low current consumption with circuit current values as low as 0.80 μA (on) and 0.85 μA (off).
• Supports manual reset input for controlled system initialization without requiring additional logic.

Applications

• Monitoring power supply voltages in embedded systems requiring precise reset timing.
• Protecting microcontrollers and memory devices from unstable power conditions during startup or shutdown.
• Ensuring system reliability in industrial equipment operating within extended temperature ranges.

Procurement Notes

Verify the specific ordering suffix and package variant against the official ROHM datasheet before procurement, as availability may vary by region. Confirm that the open-drain output configuration aligns with the target circuit's pull-up requirements. Check for end-of-life status or last-time-buy notices, as this component may be subject to discontinuation. Ensure compatibility with the required thermal management specifications for the intended application environment.

Selection Notes

Select this component when a fixed 100 ms reset delay is sufficient for the system's stability requirements. Choose the BD46241G-TR over adjustable delay variants if external capacitor placement is constrained or if design simplicity is prioritized. Consider the open-drain output interface for compatibility with various logic levels via external pull-up resistors. Evaluate the ±1% accuracy specification against the system's voltage tolerance margins to ensure reliable detection thresholds.

Part Context

The BD46241G-TR belongs to the BD46 series of CMOS voltage detector ICs from ROHM Semiconductor. This series is characterized by its integration of internal delay timers, reducing external component count compared to earlier generations. It serves as a supervisory circuit alternative to general-purpose comparators, offering dedicated reset functionality optimized for digital logic protection. The part is distinct from automotive-specific variants like the BD46Exxxx-M series, which carry AEC-Q100 certification.

Replacement Considerations

The BD5224G-1TR is listed as a similar level replacement with the same package and pinout. Verify that the BD5224G-1TR's adjustable delay feature does not conflict with designs relying on the fixed 100 ms delay of the BD46241G-TR. Confirm that the output type and precision specifications remain compatible with the existing circuit design.