BU45K272G-TL

Supervisors Overview

The BU45K272G-TL is a fixed-delay voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-input power supply lines. It features an open-drain output and operates within a maximum supply voltage of 6 V. The device triggers a reset signal when the input voltage drops below a threshold of 2.7 V, with a fixed delay time of 200 ms. It supports a reset active voltage range from 0.6 V to 6 V and maintains high accuracy with a detection precision of ±1%. The component is housed in an SSOP-3 package and functions reliably across a temperature range of -40°C to +105°C.

Supervisors Feature Summary

• Provides stable system supervision through a fixed 200 ms reset delay timer to prevent false triggering during transient voltage dips.
• Features an open-drain output configuration compatible with various logic families, supporting a wide reset active voltage range.
• Delivers precise under-voltage detection with ±1% accuracy and built-in hysteresis to ensure noise immunity.

Supervisors Applications

• Monitoring battery-powered portable electronic devices to indicate low power conditions.
• Supervising microcontroller and digital logic circuits against brown-out events.
• Protecting memory and storage components during unexpected power loss scenarios.

Supervisors Procurement Notes

Verify the specific ordering suffix and package variant before procurement, as availability may vary by region. Confirm that the selected component matches the required threshold voltage and output type for your circuit design. Check for any recent lifecycle status updates, as this part may be subject to discontinuation or replacement recommendations by the manufacturer.

Supervisors Selection Notes

Select this component when a fixed delay response is sufficient for the application's stability requirements. Ensure the 2.7 V threshold aligns with the minimum operating voltage of the monitored load. Consider the SSOP-3 package constraints for PCB layout and verify that the open-drain output can drive the subsequent logic inputs effectively within the specified voltage range.

Supervisors Part Context

This voltage detector belongs to the BU45/BU46 series of supervisory circuits from ROHM Semiconductor. These devices are engineered for compact designs requiring minimal external components. The BU45K272G-TL specifically targets applications needing reliable under-voltage protection with a standardized delay characteristic, fitting into the broader portfolio of power management ICs for consumer and industrial electronics.

Supervisors Replacement Considerations

The BD5227G-1 is documented as a similar specification replacement. Note that the BD5227G-1 utilizes an SSOP-5 package instead of SSOP-3 and offers an adjustable delay timer rather than a fixed one. Verify pinout compatibility and electrical parameter alignment before substituting.