BU4919F-TR

Supervisors Overview

The BU4919F-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring power supply voltages within a range of 0.7 V to 7 V. It features a typical under-voltage detection threshold of 1.9 V with a precision of ±1%. The device operates on a single input and provides a CMOS output type with a reset active state of low. It consumes a circuit current of 0.40 μA (ON) and 0.55 μA (OFF) at VDET=4.8V. The component supports an operating temperature range from -40°C to +125°C and is housed in a SOP-4 package.

Supervisors Feature Summary

• CMOS output structure for direct logic interface compatibility
• High accuracy voltage detection with ±1% precision tolerance
• Ultra-low power consumption suitable for battery-operated systems
• Wide operating voltage range supporting various system rails

Supervisors Applications

• Portable electronic devices requiring low standby current
• Battery-powered equipment needing reliable power supervision
• General-purpose industrial control systems
• Consumer electronics utilizing standard voltage rails

Supervisors Procurement Notes

Verify the specific suffix 'TR' indicates tape and reel packaging configuration. Confirm the exact threshold voltage variant matches design requirements as the BU4919 series includes multiple voltage options. Check RoHS compliance status through official documentation. Ensure the SOP-4 package dimensions align with PCB layout constraints. Validate that the CMOS output type meets the load requirements of the downstream circuitry.

Supervisors Selection Notes

Select this component when a fixed 1.9 V threshold is required for system reset or monitoring. Consider the CMOS output drive capability against the connected load. Evaluate the ±1% precision against system noise margins. Compare the 0.40 μA operating current against stricter low-power alternatives if battery life is critical. Ensure the -40°C to +125°C temperature range covers the intended application environment.

Supervisors Part Context

The BU4919F-TR belongs to the BU4919 series of standard voltage detectors from ROHM Semiconductor. This series is characterized by high precision and low current consumption. The part is specifically identified by its 1.9 V detection threshold and SOP-4 package. It serves as a supervisory circuit for maintaining system stability during power fluctuations.

Supervisors Replacement Considerations

The BD5219G-1 is listed as a similar specification replacement. Note that the BD5219G-1 uses an SSOP-5 package and open-drain output, requiring pinout and electrical characteristic verification before substitution.