BD87B34G-CTR

Overview

The BD87B34G-CTR is an automotive voltage detector IC integrating a reset function for monitoring microcomputer input voltage and a watchdog timer (WDT) for clock signal supervision. It features a typical under-voltage detection threshold of 3.4V with ±2.0% precision. The device supports a wide reset active voltage range from 2V to 20V, accommodating high-input systems. Static current consumption is low at 4.5µA (ON) and 3µA (OFF), enhancing system redundancy. The output type is open drain with a low-active state. External resistors configure the detection voltage, while capacitors adjust reset delay and WDT monitoring times.

Feature Summary

• Integrates microprocessor input voltage reset and clock signal watchdog timer functions
• Maintains low static current consumption across a wide 20V input voltage range
• Allows configurable reset detection voltage via external resistors
• Supports adjustable reset delay and watchdog monitoring times via external capacitors

Applications

• Automotive microcomputer power supply monitoring
• Microprocessor clock signal supervision
• System redundancy enhancement in high-voltage automotive environments
• Functional safety support for automotive electronic control units

Procurement Notes

Verify the specific suffix 'CTR' indicates the taping packaging format with a quantity of 3000 units per reel. Confirm the part meets AEC-Q100 Grade 1 qualification standards for automotive applications. Ensure the FS Supportive classification aligns with your functional safety analysis requirements. Cross-reference the SSOP6 package dimensions against your PCB footprint specifications before finalizing procurement.

Selection Notes

Select this component when a fixed 3.4V detection threshold is required for automotive microcontrollers. Choose the BD87B34G-CTR over other series members if the specific voltage level matches the target system's brown-out protection needs. Consider the SSOP6 package size constraints and the open-drain output compatibility with the microcontroller's reset pin logic levels during circuit design.

Part Context

This part belongs to ROHM's automotive-grade voltage detector family designed for functional safety support. It shares architectural similarities with models like BD87B29G-C and BD87B41G-C, differing primarily in the fixed detection voltage threshold. The series is characterized by low power consumption and integrated watchdog capabilities, targeting robust performance in harsh automotive electrical environments.

Replacement Considerations

Direct substitutes include BD87B29G-CTR (2.9V threshold), BD87B41G-CTR (4.1V threshold), and BD87B46G-CTR (4.6V threshold). Verify that the alternative detection voltage aligns with the microcontroller's reset requirements. Ensure the replacement maintains the same SSOP6 package and open-drain output characteristics.