BU4931F-TR

Supervisors Overview

The BU4931F-TR is a CMOS voltage detector IC from ROHM Semiconductor, designed for monitoring single power supply lines. It features a fixed under-voltage detection threshold of 3.1 V with ±1% accuracy and a hysteresis of VDET x 0.05. The device operates within a reset active voltage range of 0.7 to 7 V and supports a maximum supply voltage of 7 V. It draws a typical circuit current of 0.40 μA (ON) and 0.55 μA (OFF) at VDET=4.8V. The output provides low-level drive currents of 3.3 mA and high-level currents of 6.5 mA. Packaged in SOP-4, it functions across an industrial temperature range of -40°C to +125°C.

Supervisors Feature Summary

• CMOS architecture ensures ultra-low power consumption suitable for battery-operated systems.
• Fixed 3.1 V detection threshold with high precision eliminates external resistor requirements.
• Robust output stage delivers sufficient drive current for direct logic interface.

Supervisors Applications

• Portable electronic devices requiring efficient power management
• Battery-powered equipment needing reliable under-voltage protection
• General-purpose supervisory circuits in consumer electronics

Supervisors Procurement Notes

Verify the obsolete status and last-time-buy designation before finalizing procurement plans. Confirm that the SOP-4 package dimensions align with existing PCB footprints. Ensure compliance with RoHS directives as indicated in official documentation. Review lead times carefully due to potential discontinuation risks associated with this component lifecycle stage.

Supervisors Selection Notes

Select this component when a fixed 3.1 V threshold is required without external programming resistors. The CMOS output type suits digital logic interfaces directly. Consider the operating temperature range and package size constraints. Verify that the supply voltage does not exceed the 7 V maximum rating during normal operation or transient conditions.

Supervisors Part Context

This part belongs to the BU49xx series of standard voltage detectors manufactured by ROHM Semiconductor. These components are engineered for compact surface-mount applications. The series typically offers various detection voltages and packages to support diverse system supervision needs. This specific model utilizes the SOP-4 form factor for space-efficient integration.

Supervisors Replacement Considerations

The BD5231G-1 is documented as a recommended replacement with similar specifications. Note differences in package type (SSOP5 vs SOP-4) and output structure (open drain vs CMOS). Verify pinout compatibility and electrical parameter alignment before substitution.