BU4845G-TR

Supervisors Overview

The BU4845G-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for supervisory circuit applications. It features a single-channel monitoring input with an open-drain output type and a threshold voltage of 4.5V. The device operates within a supply voltage range of 0.8V to 6V and maintains a detection accuracy of ±0.9%. It is housed in a compact 5-SSOP package (SC-74A/SOT-753) suitable for surface mount installation. The component supports a wide operating temperature range from -40°C to +125°C and includes a low reset active state without manual reset or watchdog timer functionality.

Supervisors Feature Summary

• CMOS technology ensures low power consumption for battery-operated systems
• Open-drain output provides flexible interface compatibility with various logic families
• Compact SSOP-5 package facilitates space-constrained PCB layouts

Supervisors Applications

• Portable electronic devices requiring voltage supervision
• Embedded systems needing power-on reset signals
• Battery-powered equipment monitoring supply levels

Supervisors Procurement Notes

Verify the obsolete status and NRND designation before procurement, as this part is not recommended for new designs. Confirm availability through authorized distributors, noting that standard packaging quantities may apply. Ensure compliance with RoHS directives and check for moisture sensitivity handling requirements during storage and assembly processes.

Supervisors Selection Notes

Select this component when a fixed 4.5V threshold is required for system supervision. Consider the open-drain output capability for interfacing with different voltage domains. Evaluate the thermal performance within the specified -40°C to +125°C range for your application environment. Compare against newer alternatives if long-term supply stability is a critical project requirement.

Supervisors Part Context

This voltage detector belongs to the BU48 series of simple reset/power-on-reset ICs from ROHM. It is part of a family of supervisory circuits designed for general-purpose voltage monitoring. The specific model utilizes a 5-pin SSOP package, distinguishing it from other variants in the series that may offer different pin counts or additional features like watchdog timers.

Supervisors Replacement Considerations

The BD5245G-1 is identified as a similar level replacement with the same SSOP5 package. Verify electrical parameter compatibility, particularly the threshold voltage and output characteristics, before substituting. Note that the BD5245G-1 is recommended for new designs, whereas the BU4845G-TR is obsolete.