BU46K234G-TL

Overview

The BU46K234G-TL is a CMOS voltage detector IC from the ROHM BU45/BU46 series, designed for monitoring single power supply inputs. It features a fixed threshold voltage of 2.3 V with an accuracy of ±1%. The device includes an internal counter timer that provides a fixed reset delay time of 400 ms, eliminating the need for external capacitors. It operates within a supply voltage range of 0.6 V to 6 V and consumes a typical quiescent current of 2.8 µA. The component is housed in an SSOP-3 package and supports operation temperatures from -40°C to +105°C.

Feature Summary

• Integrated counter timer circuit eliminates the requirement for external delay-setting capacitors.
• CMOS output structure ensures low power consumption suitable for battery-operated systems.
• Fixed reset delay time simplifies design by removing external timing components.

Applications

• Microprocessor system reset circuits
• Battery-powered equipment supervision
• Portable electronic device 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 or surplus channels. Ensure compatibility with existing PCB footprints and validate that the fixed 400 ms delay meets system timing requirements. Check RoHS compliance documentation if required for specific regulatory standards.

Selection Notes

Select this component when a fixed 2.3 V threshold and 400 ms delay are sufficient for the application. Consider alternatives if adjustable delay times or different package types are needed. Verify that the CMOS output drive capability meets the load requirements of the downstream circuitry. Ensure the operating temperature range aligns with the environmental conditions of the final product.

Part Context

This voltage detector belongs to the BU45/BU46 series, which offers high accuracy and low current consumption. The series is characterized by built-in timer circuits, reducing component count. The BU46K234G-TL specifically targets applications requiring precise under-voltage detection with minimal external support components.

Replacement Considerations

The BD5223G-1 is listed as a similar specification replacement. Note that the substitute uses an SSOP-5 package instead of SSOP-3, requiring layout adjustments. The replacement offers adjustable delay times and lower current consumption but differs in output type and pin configuration.