BD3775AF-E2

Overview

The BD3775AF-E2 is a dual-channel reset and comparator integrated circuit manufactured by ROHM Semiconductor, designed for power supply voltage monitoring. It operates within a supply voltage range of 3.5 V to 18 V and features a typical threshold detection voltage of 1.23 V with ±1.5% precision. The device includes three monitored inputs and provides open-collector outputs. It consumes 350 µA at 5 V and functions between -40°C and +85°C. The IC is housed in an SOP-8 package (5.0×6.2 mm) and lacks manual reset or watchdog timer capabilities.

Feature Summary

• Provides high-precision voltage detection with user-selectable threshold levels and hysteresis for reliable under-voltage monitoring.
• Integrates internal open-collector output comparators to enable over-voltage protection circuits and reference voltage generation.
• Features an adjustable delay timer for releasing the reset signal, configurable via an external capacitor on the CT node.

Applications

• Monitoring power supply voltages during instantaneous interruptions or drops to generate reset signals.
• Generating power-on reset signals when power supply voltage returns to normal levels.
• Implementing over-voltage protection circuits using the built-in comparator functionality.

Procurement Notes

Verify the specific suffix E2 against the manufacturer's datasheet to confirm pinout and electrical characteristics match your design requirements. Ensure the SOP-8 package dimensions align with your PCB footprint constraints. Confirm that the absence of a manual reset function does not conflict with system initialization logic. Validate that the operating temperature range meets your environmental specifications.

Selection Notes

Select this component when precise monitoring of multiple power rails is required without complex external circuitry. The adjustable delay feature allows customization of reset timing based on system stability needs. The low current consumption makes it suitable for battery-powered applications where efficiency is critical. Consider the open-collector output type for compatibility with various logic families.

Part Context

This part belongs to ROHM's supervisory circuit portfolio, specifically categorized under PMIC - Power Management ICs. It serves as a specialized solution for systems requiring robust power integrity management. The BD3775AF series is distinct from audio amplifiers or DDR regulators found in other ROHM product lines, focusing solely on voltage supervision and comparison tasks.

Replacement Considerations

Check for direct substitutes within the BD3775 family, such as the BD3775AF, ensuring functional equivalence. Verify that any alternative maintains the same SOP-8 package and electrical parameters. Consult official substitution guides for cross-references that preserve performance and compatibility.