BU45L272G-TL

Overview

The BU45L272G-TL is a voltage detector IC from the ROHM BU45/BU46 series, designed for monitoring single-input power supplies. It features a fixed threshold voltage of 2.7 V with an accuracy of ±1%. The device operates within a supply voltage range of 0.6 V to 6 V and consumes a typical operating current of 2.8 µA. It provides a reset delay time of 200 ms without requiring external timing capacitors due to its built-in counter timer circuit. The output stage is open-drain, and the component supports manual reset-free operation. It is housed in an SSOP-3 package and functions reliably across a temperature range of -40°C to +105°C.

Feature Summary

• Built-in counter timer delay circuit eliminates the need for external capacitors for delay time setting.
• High detection accuracy of ±1% ensures precise voltage monitoring.
• Low current consumption design suitable for battery-powered applications.
• Fixed reset delay time simplifies circuit design by removing external timing components.

Applications

• Portable electronic devices requiring low standby current
• Battery-operated equipment needing reliable power supervision
• Embedded systems with strict space constraints using SSOP-3 packaging

Procurement Notes

Verify component authenticity through authorized channels as this part is marked Not Recommended for New Designs (NRND). Confirm that the open-drain output configuration matches your system logic requirements. Ensure thermal management aligns with the specified operating temperature range. Check for moisture sensitivity handling procedures during storage and assembly. Validate that the 2.7V threshold meets your specific under-voltage detection needs.

Selection Notes

Select this component when a fixed 2.7V threshold with high accuracy is required. Consider the open-drain output type for compatibility with pull-up resistor configurations. Evaluate the 200ms reset delay against system startup timing requirements. Assess the low current consumption benefit for battery life extension. Verify that the SSOP-3 package fits within the available PCB area constraints.

Part Context

This component belongs to the BU45/BU46 series of voltage detectors known for high accuracy and low power consumption. The BU45L272G-TL specifically offers a 2.7V threshold with open-drain output. It is part of ROHM's portfolio aimed at providing reliable supervisory solutions for portable electronics. The series is characterized by integrated timer circuits that reduce external component count.

Replacement Considerations

BD5227G-1TR is listed as a similar specification replacement. Note that the BD5227G-1TR uses an SSOP-5 package instead of SSOP-3, requiring layout adjustments. The BD5227G-1TR offers adjustable delay time rather than fixed 200ms. Verify pinout compatibility and electrical parameter alignment before substitution.