BU45K334G-TL

Overview

The BU45K334G-TL is a fixed-delay voltage detector IC from the ROHM BU45 series, designed for monitoring single-input power supplies. It features a 3.3 V threshold with 1% accuracy and a built-in 400 ms reset delay timer, eliminating the need for external capacitors. The device operates within a supply voltage range of 0.6 V to 6 V and offers an open-drain output. Packaged in an SSOP-3 format, it supports surface-mount installation and functions across temperatures from -40°C to +105°C while consuming only 2.8 µA.

Feature Summary

• Built-in counter timer delay circuit removes requirement for external delay-setting capacitors
• High detection accuracy maintained at 1% tolerance for the monitored voltage threshold
• Low current consumption design suitable for battery-powered or energy-efficient applications

Applications

• Microprocessor system reset circuits
• Battery voltage monitoring systems
• Portable electronic device power management

Procurement Notes

Verify component authenticity through authorized channels due to Not Recommended for New Designs status. Confirm package integrity and moisture sensitivity handling requirements before assembly. Cross-reference datasheet specifications against current project needs as this part may be subject to obsolescence or limited availability constraints.

Selection Notes

Select this component when a fixed 400 ms delay is required without external timing components. Ensure the 3.3 V threshold aligns with target logic levels. Consider the open-drain output configuration compatibility with downstream circuitry. Evaluate thermal performance within the specified operating temperature range for the intended environment.

Part Context

This voltage detector belongs to the BU45/BU46 series, characterized by high accuracy and low power consumption. The BU45K334G-TL specifically utilizes the SSOP-3 package with a rotated ground pin configuration. It serves as a supervisory circuit within the PMIC category, providing reliable under-voltage detection for digital systems.

Replacement Considerations

The BD5233G-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 rather than fixed delay and has different current consumption characteristics.