BD4954G-TR

Overview

The BD4954G-TR is a standard voltage detector IC from the BD49xxx series, manufactured by ROHM Semiconductor. It features a typical under-voltage detection threshold of 5.4V with ±1% precision. The device operates within a reset active voltage range of 0.95V to 10V and utilizes a CMOS output type with an active low state. Circuit current consumption is specified at 0.60μA (ON) and 0.85μA (OFF) at Vs=4.8V. Hysteresis voltage is defined as Vs x 0.05. The component is housed in a 5-pin SSOP package and supports an operating temperature range from -40°C to 105°C. It lacks manual reset, watchdog timer, and automotive certification.

Feature Summary

• Provides precise under-voltage detection with high accuracy for system supervision.
• Features ultra-low current consumption suitable for battery-powered applications.
• Includes built-in hysteresis to prevent output oscillation during voltage transitions.

Applications

• Processor supervisor circuits requiring voltage monitoring
• Battery-operated electronic devices needing power management
• General-purpose system reset generation

Procurement Notes

Verify supply status carefully as the BD4954G is listed as 'Last Time Buy' or discontinued in official documentation. Confirm that the replacement part BD5250G-1TR meets specific application requirements, noting differences in detection voltage (5.0V vs 5.4V), output type (open drain vs CMOS), and package dimensions. Ensure compatibility with existing PCB layout and circuit design before finalizing procurement decisions.

Selection Notes

Select this component when a 5.4V detection threshold with CMOS push-pull output is required. Consider the BD5250G-1TR if an open-drain output or different voltage range is acceptable. Evaluate the trade-off between the discontinued status of the BD4954G and the availability of the recommended replacement. Verify that the SSOP5 package fits the mechanical constraints of the target design.

Part Context

The BD4954G-TR belongs to the BD49xxx series of highly accurate, low-current voltage detector ICs. This family offers various detection voltages ranging from 2.3V to 6.0V in 0.1V increments. The series is designed for applications requiring reliable power supervision with minimal quiescent current, utilizing CMOS output stages for direct interfacing with digital logic circuits.

Replacement Considerations

The BD5250G-1TR is the officially recommended similar level replacement. Key differences include a 5.0V detection voltage versus 5.4V, an open-drain output instead of CMOS, and a smaller SOT23-5 package compared to the SSOP5. Designers must adjust circuitry to accommodate the output type change and verify voltage threshold compatibility.

FAQ

What is the output configuration of the BD4954G?

The BD4954G features a CMOS output type with an active low reset state.

Does the BD4954G include a watchdog timer?

No, the BD4954G does not include a watchdog timer or manual reset function.