BU45K464G-TL

Supervisors Overview

The BU45K464G-TL is a fixed-delay voltage detector IC from ROHM Semiconductor, designed for monitoring single power supply lines. It features a typical under-voltage detection threshold of 4.6V with ±1% precision. The device provides an open-drain output that activates when the input voltage falls below the detection level, following a fixed internal delay timer of 400ms. It operates within a reset active voltage range of 0.6V to 6V and consumes low circuit current, typically 2.3μA in the ON state and 2.8μA in the OFF state. Hysteresis is set at VDET x 0.05. The component is housed in an SSOP-3 package and supports an operating temperature range from -40°C to +105°C.

Supervisors Feature Summary

• Integrates a built-in counter timer delay circuit, eliminating the need for external capacitors for delay time setting.
• Provides high accuracy voltage detection with a typical precision of ±1%.
• Features low current consumption suitable for battery-powered applications.
• Offers an open-drain output type for flexible interface compatibility.

Supervisors Applications

• Monitoring power supply voltages in portable electronic devices
• Reset generation circuits for microcontrollers and digital logic
• Battery backup switching supervision
• General-purpose supervisory circuits requiring fixed delay response

Supervisors Procurement Notes

Verify the specific suffix TL indicates tape and reel packaging if required for automated assembly. Confirm the supply status as Not Recommended for New Designs (NRND) or obsolete before finalizing design-in decisions. Ensure the SSOP-3 package dimensions match the target PCB footprint. Check RoHS compliance documentation for environmental regulatory requirements. Validate the 4.6V threshold against the specific system voltage rails to ensure correct triggering behavior.

Supervisors Selection Notes

Select this component when a fixed 400ms delay is acceptable and no manual reset or watchdog functionality is needed. Compare with BD5246G-1 if adjustable delay or lower current consumption is prioritized over the fixed delay feature. Consider the open-drain output requirement for pull-up resistor implementation. Evaluate the SSOP-3 package size constraints against available board space. Verify that the 4.6V detection threshold aligns with the minimum operating voltage of the protected load.

Supervisors Part Context

This part belongs to the BU45/BU46 series of highly accurate, low current consumption voltage detector ICs from ROHM. The series is characterized by built-in delay timers, removing the need for external timing components. The BU45 variant specifically offers an open-drain output, distinguishing it from CMOS output options in the broader family. These detectors are intended for general industrial and consumer electronics applications rather than automotive grade environments.

Supervisors Replacement Considerations

BD5246G-1 is listed as a similar specification replacement, though it features an adjustable delay timer instead of a fixed one and uses an SSOP-5 package. Verify pinout compatibility and electrical parameter alignment before substitution.