BU4338F-TR

Overview

The BU4338F-TR is a supervisory circuit manufactured by ROHM Semiconductor, designed for power supply support applications. It functions as a voltage detector with a typical under-voltage detection threshold of 3.8V and a precision of ±1%. The device features an adjustable reset delay timer and operates within a reset active voltage range of 0.7V to 7V. It utilizes a CMOS output type with a low active state. Key electrical parameters include a circuit current of 0.40μA in the ON state and 0.55μA in the OFF state at VDET=4.8V. The hysteresis voltage is defined as VDET multiplied by 0.05. The component supports an L-output current of 3.3mA (LowVol) and 6.5mA (HighVol), with a delay circuit resistance of 10.0MΩ. It operates across a temperature range from -40°C to 125°C and is housed in a SOP4 package.

Feature Summary

• Integrates an adjustable reset delay timer for customized timing control.
• Provides high-precision voltage detection with ±1% accuracy.
• Features ultra-low power consumption suitable for battery-operated systems.

Applications

• Portable electronic devices requiring efficient power management
• Embedded systems needing reliable voltage supervision
• Consumer electronics utilizing CMOS logic interfaces

Procurement Notes

Verify the specific suffix and package variant against the official datasheet to ensure compatibility with existing PCB layouts. Confirm that the operating temperature range meets the environmental requirements of the target application. Check the latest supply status, as this component may be subject to discontinuation or limited availability. Ensure that the replacement parts, if necessary, maintain identical pinout and electrical characteristics to avoid redesign efforts.

Selection Notes

Select this component when a fixed 3.8V detection threshold with adjustable delay is required. Consider the low quiescent current for energy-sensitive designs. Evaluate the CMOS output drive capability against load requirements. Compare performance metrics such as hysteresis and precision against alternative supervisors to ensure system stability under varying voltage conditions.

Part Context

This part belongs to the BU43xx series of voltage detectors from ROHM Semiconductor. These components are engineered for monitoring power rails in digital circuits. The series offers various threshold voltages and output configurations to suit different system architectures. The BU4338F-TR specifically addresses applications needing precise under-voltage detection with flexible reset timing.

Replacement Considerations

The BD5238G-1 is listed as a recommended replacement with the same pinout and package. Verify electrical parameter differences, particularly regarding output type and current ratings, before substitution.