BU45K234G-TL

Overview

The BU45K234G-TL is a fixed-delay time type voltage detector IC from ROHM Semiconductor. It features a threshold voltage of 2.3 V and a reset delay time of 400 ms. The device operates within a supply voltage range of 0.6 V to 6 V with an accuracy of ±1%. It has an open-drain output, consumes 2.8 µA in the ON state, and functions between -40°C and +105°C. The component is housed in an SSOP-3 package.

Feature Summary

• Built-in counter timer delay circuit eliminates the need for external capacitors for delay setting
• High detection accuracy with ±1% precision for the threshold voltage
• Low current consumption suitable for battery-powered applications
• Fixed low-level active reset output without manual reset or watchdog timer

Applications

• Microprocessor reset circuits
• Battery voltage monitoring systems
• Portable electronic devices requiring low power supervision
• Embedded system power management

Procurement Notes

Verify the obsolete status before procurement as this part is Not Recommended for New Designs (NRND). Confirm availability through authorized distributors for existing production runs. Ensure compatibility with the SSOP-3 package dimensions and verify RoHS compliance details via the official datasheet prior to integration into final assemblies.

Selection Notes

Select this component when a fixed 400 ms delay and 2.3 V threshold are required. Consider the BU46 series if CMOS output is preferred over open-drain. Evaluate the BD5223G-1TR as a recommended replacement offering adjustable delay and improved current efficiency if design flexibility is needed.

Part Context

This voltage detector belongs to the BU45/BU46 series designed for high accuracy and low current consumption. The BU45 variant specifically utilizes an N-channel open-drain output structure. It is part of ROHM's portfolio aimed at simplifying power management by integrating timing functions directly into the detector IC.

Replacement Considerations

The BD5223G-1TR is listed as a similar specification replacement. Note that the BD5223G-1TR uses an SSOP-5 package instead of SSOP-3 and offers adjustable delay times rather than fixed delays.