BU4229F-TR

Overview

The BU4229F-TR is a CMOS voltage detector IC from Rohm Semiconductor, designed for monitoring single-channel power supply voltages. It features an adjustable reset delay timer and operates within a supply voltage range of 0.7 V to 7 V. The device provides a typical under-voltage detection threshold of 2.9 V with a precision of ±1%. It utilizes an open-drain output type and supports a low active reset state. The component is housed in a compact SOP-4 package and is rated for operation across a wide temperature range from -40°C to +125°C.

Feature Summary

• Adjustable reset delay timer allows customization of output timing relative to voltage thresholds.
• Open-drain output configuration facilitates interface compatibility with various logic families.
• Ultra-low current consumption ensures minimal power drain during standby or active monitoring states.

Applications

• Portable electronic devices requiring efficient battery voltage supervision
• Embedded systems needing reliable power-on reset generation
• Industrial control circuits operating in extended temperature environments

Procurement Notes

Verify the specific suffix F-TR against the manufacturer's latest datasheet to confirm package dimensions and tape-and-reel specifications. Confirm RoHS compliance status as required by your assembly standards. Check for end-of-life notifications or last-time-buy recommendations, as this component may have limited future availability. Ensure the open-drain output requirements match your system's pull-up resistor design.

Selection Notes

Select this component when a single-channel voltage monitor with adjustable delay is required. The 2.9 V threshold suits applications where mid-range voltage supervision is critical. Consider the SOP-4 footprint for space-constrained PCB layouts. Verify that the open-drain output aligns with the input requirements of the downstream microcontroller or logic gate. Evaluate the ±1% accuracy against system tolerance requirements.

Part Context

This part belongs to the BU42xx series of CMOS voltage detectors from Rohm Semiconductor. The series is characterized by low power consumption and high accuracy. The BU4229F-TR specifically targets cost-sensitive consumer and industrial applications where precise voltage monitoring and flexible timing are necessary without complex external components.

Replacement Considerations

BD5229G-1 is listed as a recommended replacement with the same pinout. Verify package compatibility, as BD5229G-1 uses SSOP-5 while BU4229F-TR uses SOP-4. Check if the output type difference (CMOS vs Open Drain) affects circuit functionality.