BU45K454G-TL

Supervisors Overview

The BU45K454G-TL is a fixed delay voltage detector IC from the ROHM BU45/BU46 series, designed for monitoring power supply voltages. It features a threshold voltage of 4.5V with ±1% accuracy and a fixed reset delay timer of 400ms. The device operates within a supply voltage range of 0.6V to 6V and consumes a typical operating current of 2.8µA. It provides an open-drain output and is housed in an SSOP-3 package. The component supports an operating temperature range from -40°C to +105°C and includes built-in hysteresis.

Supervisors Feature Summary

• Built-in counter timer delay circuit eliminates the need for external capacitors for delay time setting
• High detection accuracy of ±1% ensures reliable voltage monitoring without manual reset functionality
• Low current consumption design suitable for battery-powered applications with no watchdog timer or backup switch

Supervisors Applications

• Power supply voltage monitoring in portable electronic devices
• Microprocessor system reset circuits requiring fixed delay timing
• Battery-operated equipment where low standby current is critical

Supervisors Procurement Notes

Verify component authenticity through authorized channels as this part is obsolete. Confirm package integrity and moisture sensitivity level handling requirements before assembly. Check for RoHS compliance documentation. Ensure replacement strategies are in place due to end-of-life status. Validate electrical parameters against original design specifications during integration.

Supervisors Selection Notes

Consider the BU45K454G-TL for designs requiring precise 4.5V detection with a fixed 400ms delay. Evaluate the SSOP-3 footprint constraints and thermal performance within the specified temperature range. Compare current consumption metrics against alternative supervisory circuits if lower power is required. Assess compatibility with open-drain logic levels in the target system architecture.

Supervisors Part Context

This component belongs to the BU45/BU46 series of highly accurate, low current consumption voltage detectors. These ICs integrate internal delay timers to simplify circuit design by removing external timing components. The series offers various threshold voltages and delay options to accommodate different power management needs across consumer and industrial electronics.

Supervisors Replacement Considerations

The BD5245G-1 is listed as a similar specification replacement. Note that the substitute uses an SSOP-5 package instead of SSOP-3 and features adjustable delay rather than fixed delay. Verify pinout compatibility and electrical parameter alignment before substitution.