BD87B46G-CTR

Overview

The BD87B46G-CTR is an automotive voltage detector IC integrating reset and watchdog timer (WDT) functions. It features a typical under-voltage detection voltage of 4.6V with ±2.0% precision. The device supports a reset active voltage range from 2V to 20V and operates with circuit currents of 4.5µA (ON) and 3µA (OFF). Hysteresis is set at VDET×0.036. It utilizes an SSOP-6 package, complies with AEC-Q100 Grade 1 standards, and supports functional safety analysis.

Feature Summary

• Integrates microprocessor input voltage monitoring reset and clock signal monitoring watchdog timer
• Maintains low static current across a wide input voltage range up to 20V
• Supports adjustable reset delay time and watchdog monitoring duration via external capacitors

Applications

• Automotive microprocessor system power supply supervision
• Microcontroller clock signal integrity monitoring
• Functional safety support in automotive electronic control units

Procurement Notes

Verify the specific suffix 'CTR' indicates tape-and-reel packaging configuration as documented. Confirm RoHS compliance status and FS supportive classification for the exact part number variant. Ensure the SSOP-6 package dimensions match the design layout requirements. Validate that the 4.6V detection threshold aligns with the target system voltage levels before procurement.

Selection Notes

Select this component when both undervoltage reset and watchdog timer functionalities are required in a single package. The open-drain output type requires appropriate pull-up resistor configuration. Consider the external capacitor requirements for adjusting timing parameters. The wide operating temperature range suits harsh automotive environments.

Part Context

This part belongs to Rohm Semiconductor's automotive-grade voltage detector series designed for functional safety applications. It shares architectural similarities with other models in the BD87B family but differs in detection voltage thresholds and package options. The series targets robust microprocessor supervision in demanding vehicular electronics.

Replacement Considerations

BD87B46FVM-C offers similar functionality in an MSOP-8 package. BD87B41G-C provides a 4.1V detection threshold in the same SSOP-6 form factor. BD87B34G-C features a 3.4V detection threshold. Verify pin compatibility and detection voltage alignment when substituting.