BD4857G-TR

Overview

The BD4857G-TR is a standard CMOS voltage detector IC manufactured by ROHM Semiconductor. It features a fixed detection threshold of 5.7V and an open-drain output configuration. The device operates within a supply voltage range up to 10V and maintains high accuracy with a tolerance of 1%. It includes a reset delay time of 100 microseconds and consumes a typical operating current of 900 nA. The component is housed in a 5-pin SSOP package and supports operation across a temperature range from -40°C to +105°C.

Feature Summary

• Provides precise voltage monitoring with high detection accuracy
• Features low power consumption suitable for battery-operated systems
• Utilizes an open-drain output for flexible logic interfacing

Applications

• Power-on reset circuits for microprocessors
• Voltage supervision for portable electronic devices
• Battery backup switching systems

Procurement Notes

This component has been officially announced as obsolete by the manufacturer. Procurement should focus on verifying the authenticity of remaining stock from authorized distributors or secondary market sources. Buyers must confirm the specific revision level and packaging condition, as availability is limited and subject to final sale without replacement guarantees from the original producer.

Selection Notes

Engineers requiring this specific 5.7V threshold should evaluate the broader BD48 series for available alternatives with similar electrical characteristics. Considerations include matching the open-drain output capability and ensuring the thermal performance aligns with the application's environmental constraints. Verify that the replacement part offers comparable accuracy and delay timing to maintain system integrity.

Part Context

The BD4857G-TR belongs to the BD48xxx series of highly accurate, low-current voltage detectors from ROHM. This family is characterized by N-channel open-drain outputs and is designed for applications requiring reliable power supervision. The device represents a discontinued generation of PMIC solutions, previously utilized in compact embedded systems where space and power efficiency were critical design parameters.

Replacement Considerations

No public confirmed substitute part numbers are available for this obsolete component.