BU46K454G-TL

Supervisors Overview

The BU46K454G-TL is a voltage detector IC from the ROHM BU45/BU46 series, designed for monitoring single power supply lines. It features a fixed threshold voltage of 4.5 V with an accuracy of ±1%. The device operates within a maximum supply voltage of 6 V and consumes a typical operating current of 2.8 µA. It provides a CMOS output type with a fixed reset delay time of 400 ms, eliminating the need for external timing capacitors. The component supports surface mount installation in an SOT-23-3 package and functions reliably across a temperature range of -40°C to +105°C.

Supervisors Feature Summary

• Built-in counter timer delay circuit removes the requirement for external capacitors for delay time setting.
• Highly accurate voltage detection with ±1% precision for reliable system supervision.
• Low current consumption design suitable for battery-powered or energy-efficient applications.

Supervisors Applications

• Monitoring power supply voltages in portable electronic devices
• Supervising microprocessor reset circuits in embedded systems
• Battery voltage level detection in consumer electronics

Supervisors Procurement Notes

Verify availability status as this component may be obsolete or not recommended for new designs. Confirm package compatibility and thermal requirements against current project specifications. Check for moisture sensitivity handling instructions if storage conditions exceed specified limits. Ensure replacement parts are evaluated for pinout and electrical parameter alignment before integration.

Supervisors Selection Notes

Select this part when a fixed 4.5 V threshold with high accuracy is required. Consider the 400 ms fixed delay for reset timing needs without external components. Evaluate the low quiescent current for power-sensitive designs. Verify that the CMOS output interface matches the downstream logic requirements. Assess the operating temperature range against environmental conditions.

Supervisors Part Context

This component belongs to the BU45/BU46 series of voltage detectors from ROHM Semiconductor. These series are characterized by high accuracy and low current consumption. The specific model BU46K454G-TL utilizes a fixed delay architecture, distinguishing it from adjustable delay variants within the broader product family.

Supervisors Replacement Considerations

The BD5245G-1TR is listed as a similar specification replacement. Note differences in output type (Open drain vs CMOS) and adjustable delay capability. Verify pinout compatibility and electrical parameter alignment before substitution.