BD45321G-TR

Overview

The BD45321G-TR is a voltage detector supervisory circuit manufactured by ROHM Semiconductor, designed for monitoring single-input power supply rails. It features a fixed threshold voltage of 3.1 V with an accuracy of ±1%. The device provides an open-drain output and includes a manual reset function without a watchdog timer. It operates within a supply voltage range up to 10 V and maintains a typical static current of 800 nA. The component supports a reset delay time of 50 ms and functions across an extended temperature range from -40°C to +105°C.

Feature Summary

• Monitors single power supply input with fixed threshold detection
• Provides open-drain output signal for system reset control
• Supports manual reset functionality via dedicated pin
• Operates with low static current consumption

Applications

• Microcontroller system power supervision
• Embedded device voltage monitoring
• Industrial control board reset management
• Consumer electronics power integrity checks

Procurement Notes

Verify component authenticity through authorized channels due to end-of-life status. Confirm RoHS compliance documentation matches specific manufacturing lot requirements. Validate package marking against official datasheet specifications to prevent counterfeit substitution. Ensure storage conditions adhere to moisture sensitivity levels prior to assembly processing.

Selection Notes

Evaluate compatibility with target microcontroller reset input requirements regarding voltage levels and drive capability. Consider the fixed 50 ms delay duration against system startup timing constraints. Assess thermal performance within the specified operating temperature range for the intended application environment. Verify that the open-drain output configuration aligns with existing pull-up resistor networks in the design.

Part Context

This component belongs to the BD45 series of voltage detectors, which are specialized supervisory circuits for maintaining system stability. The BD45321G-TR variant specifically targets applications requiring a 3.1 V detection threshold. It utilizes an SSOP-5 surface-mount package for compact integration into modern electronic designs.

Replacement Considerations

The BD5231G-1TR is documented as a replacement option with the same SSOP-5 package. Note that the replacement offers adjustable delay timing rather than the fixed 50 ms delay found in the original part.