BU4818F-TR

Supervisors Overview

The BU4818F-TR is a processor supervisor manufactured by Rohm Semiconductor, designed for monitoring power supply voltages in electronic circuits. It features a fixed detection threshold of 1.8V with an active low output state and open-drain configuration. The device operates within a reset active voltage range of 0.7V to 7V and maintains a detection precision of ±1%. It supports a maximum operating temperature of 125°C and a minimum of -40°C. The component consumes 0.40μA at VDET=4.8V when on and 0.55μA when off. It utilizes a 4-SOP package with dimensions of 2.0x2.1mm.

Supervisors Feature Summary

• Provides stable voltage supervision with a fixed 1.8V detection threshold for reliable system monitoring.
• Features an open-drain output capable of driving external pull-up resistors for flexible logic interfacing.
• Operates across a wide temperature range from -40°C to +125°C for industrial environment suitability.

Supervisors Applications

• Processor power supply monitoring
• Microcontroller reset circuit generation
• Battery-powered device voltage supervision

Supervisors Procurement Notes

Verify the specific ordering suffix and packaging type against official Rohm documentation before procurement. Confirm RoHS compliance status and current supply availability as distribution channels may vary. Ensure the selected variant matches the required SOP4 package dimensions and pinout configuration for PCB integration.

Supervisors Selection Notes

Select this component when a fixed 1.8V threshold is required without adjustable delay or manual reset functions. Consider the open-drain output capability for compatibility with various logic families. Evaluate the low standby current consumption for battery-operated applications requiring extended operational life.

Supervisors Part Context

This part belongs to Rohm's standard voltage detector series, specifically engineered for supervisory applications. It complements other models in the family by offering a fixed threshold option in a compact surface-mount package. The design focuses on simplicity and reliability for basic power management tasks.

Supervisors Replacement Considerations

BD5218G-1TR is listed as a recommended replacement with similar specifications, though it features an SSOP5 package and adjustable delay timer. Verify pinout compatibility and functional differences before substitution.