BU45K344G-TL

Overview

The BU45K344G-TL is a fixed-delay voltage detector IC from ROHM Semiconductor, designed for monitoring supply voltages with high precision. It features a typical detection voltage of 3.4V and an accuracy of ±1%. The device operates within a reset active voltage range of 0.6V to 6V, utilizing an open-drain output type. A built-in fixed delay timer provides a 400msec reset delay, eliminating the need for external capacitors. The circuit consumes 2.3μA in the ON state and 2.8μA in the OFF state, with hysteresis set at VDET x 0.05. It supports a wide operating temperature range from -40°C to +105°C.

Feature Summary

• Integrates a fixed 400msec delay timer circuit internally, removing the requirement for external timing components.

Applications

• Monitoring power supply voltages in electronic circuits
• Providing reset signals for microcontrollers and logic systems
• Ensuring system stability during power-up and power-down sequences

Procurement Notes

This component is classified as obsolete or not recommended for new designs. Verify current availability through authorized distributors, noting that stock may be limited or discontinued. Confirm RoHS compliance status and check for valid replacement alternatives such as the BD5234G-1 series if sourcing new production units is required.

Selection Notes

Select this part when a fixed 400msec delay is acceptable without external components. Ensure the 3.4V threshold aligns with the target system voltage. Consider the open-drain output compatibility with downstream logic levels. Evaluate the ±1% precision against system tolerance requirements before finalizing the design choice.

Part Context

The BU45K344G-TL belongs to the BU45/BU46 series of highly accurate, low-current voltage detectors. These ICs are engineered for applications requiring precise voltage supervision with minimal power consumption. The series typically offers various detection voltages and delay options to suit different supervisory needs in portable and industrial electronics.

Replacement Considerations

The BD5234G-1 is listed as a similar specification replacement. Note that the substitute features an adjustable delay timer rather than a fixed one, and uses an SSOP5 package instead of SSOP3. Verify pinout compatibility and functional differences before substitution.