BD87A34FVM-TR

Overview

The BD87A34FVM-TR is a voltage detector with an integrated watchdog timer manufactured by ROHM Semiconductor. It features a typical detection voltage of 3.4V with high precision of ±1.5% over the operating temperature range of -40°C to +105°C. The device operates within a reset active voltage range of 1.0V to 10V and consumes a typical circuit current of only 5µA. It utilizes an N-ch open-drain output and includes adjustable reset delay and watchdog timer functions via external capacitors connected to CT and CTW terminals.

Feature Summary

• High detection voltage accuracy of ±1.5% across the full industrial temperature range
• Ultra-low power consumption with a typical operating current of 5µA
• Integrated watchdog timer for system reliability monitoring
• Adjustable reset delay and watchdog timer intervals using external capacitors

Applications

• Microprocessor reset circuits requiring precise voltage monitoring
• Battery-powered systems needing low standby current
• Industrial control units with watchdog timer requirements
• Portable electronic devices with strict power constraints

Procurement Notes

Verify the specific suffix TR indicates tape-and-reel packaging when ordering. Confirm the RoHS compliance status matches project requirements. Ensure the MSOP-8 package dimensions align with PCB layout specifications. Check for any end-of-life notices or recommended replacement parts from the manufacturer before finalizing procurement plans.

Selection Notes

Select this component when a fixed 3.4V detection threshold is required. Consider the ±1.5% precision for applications demanding tight voltage margins. Evaluate the 5µA quiescent current against total system power budgets. Verify that the N-ch open-drain output interface is compatible with the downstream logic levels.

Part Context

This part belongs to the BD87A series of voltage detectors from ROHM, which also includes variants like the BD87A29FVM with different detection voltages. These components share similar features such as low current consumption and watchdog timers but differ in their specific trip points. The series is designed for general-purpose power supply management in compact packages.

Replacement Considerations

The BD87A29FVM-TR is a related variant within the same family offering a 2.9V detection voltage instead of 3.4V. Both share the MSOP-8 package and similar functional characteristics. Verify if the lower detection threshold meets the application requirements before substituting.