BU4242G-TR

Overview

The BU4242G-TR is a CMOS voltage detector IC from ROHM Semiconductor, designed for monitoring single power supply rails. It features an adjustable reset delay timer and an open-drain output active low. The typical under-voltage detection threshold is 4.2V with ±1% precision. The operating voltage range spans from 0.7V to 7V. It operates within a temperature range of -40°C to +125°C. The device consumes 0.40μA in the ON state and 0.55μA in the OFF state at VDET=4.8V. It is housed in a compact SSOP-5 package.

Feature Summary

• Adjustable reset delay timer allows customization of response time via external components.
• Open-drain output provides flexibility for interfacing with various logic levels.
• Low power consumption ensures minimal impact on battery-operated systems.
• High accuracy voltage detection maintains system stability under varying conditions.

Applications

• Portable electronic devices requiring reliable power supervision
• Battery-powered equipment needing low quiescent current
• Industrial control systems operating in wide temperature ranges
• Consumer electronics utilizing standard CMOS logic interfaces

Procurement Notes

Verify the specific suffix G-TR confirms the SSOP-5 tape-and-reel packaging configuration. Confirm RoHS compliance status as indicated in official documentation. Check for any end-of-life notices or recommended replacement parts such as BD5242G-1 if sourcing for new designs. Ensure the supplier provides valid traceability data for quality assurance purposes.

Selection Notes

Select this component when a precise 4.2V threshold is required with adjustable timing delays. Consider the open-drain output capability for level shifting needs. Evaluate the low current consumption against system power budgets. Compare thermal performance requirements against the specified -40°C to +125°C operating range.

Part Context

This part belongs to the BU42xx series of voltage detectors from ROHM. These ICs are commonly used for supervising power supplies in portable and industrial applications. The series offers various threshold voltages and packages to suit different design constraints while maintaining consistent functional characteristics like adjustable delays and low power operation.

Replacement Considerations

BD5242G-1 is listed as a similar level replacement with the same pinout and package. Verify electrical parameter compatibility before substitution. Check if the newer part meets all original design specifications including temperature range and current consumption.

FAQ

How is the reset delay time adjusted?

The reset delay time is adjusted using an external resistor connected to the delay terminal, allowing designers to customize the response time based on application requirements.

What is the output type of the BU4242G-TR?

The BU4242G-TR features an open-drain output that becomes active low when the monitored voltage drops below the detection threshold.