BU4819F-TR

Supervisors Overview

The BU4819F-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-channel power supply voltages. It features a typical under-voltage detection threshold of 1.9V with a precision of ±1%. The device operates within a reset active voltage range of 0.7V to 7V and supports a maximum supply voltage of 7V. It utilizes an open-drain output type with a low reset active state. The component consumes 0.40μA in the ON state and 0.55μA in the OFF state at VDET=4.8V. It offers a hysteresis voltage of VDET x 0.05 and lacks manual reset or watchdog timer functions. The IC is housed in a SOP-4 package and is rated for an operating temperature range from -40°C to +125°C.

Supervisors Feature Summary

• CMOS technology enables ultra-low current consumption for battery-powered applications
• Open-drain output provides flexible interfacing with various logic families
• Integrated hysteresis prevents output oscillation during voltage transitions

Supervisors Applications

• Portable electronic devices requiring low standby current
• Battery-operated systems needing reliable power supervision
• General-purpose voltage monitoring in consumer electronics

Supervisors Procurement Notes

Verify the specific suffix 'F' confirms the SOP-4 package and standard specifications. Confirm end-of-life status as the part is marked as discontinued or not recommended for new designs. Check RoHS compliance documentation for environmental requirements. Ensure the reel quantity matches production needs. Validate that the open-drain output configuration suits the target circuit design.

Supervisors Selection Notes

Select this component when a fixed 1.9V threshold is required for simple power supervision. Consider the open-drain output compatibility with the system's pull-up resistor network. Evaluate the ±1% accuracy against application tolerance requirements. Compare the 0.40μA operating current against stricter low-power alternatives if necessary. Ensure the SOP-4 footprint fits the available PCB space constraints.

Supervisors Part Context

This part belongs to the BU48xx series of standard voltage detectors from ROHM. It shares functional similarities with other parts in the family but differs in threshold voltage and package options. The BU4819F-TR specifically targets applications needing a 1.9V detection point. It is distinct from the BU4919 series which may offer different output types or features. The TR suffix indicates tape and reel packaging for automated assembly.

Supervisors Replacement Considerations

The BD5219G-1 is listed as a similar level replacement with the same package. Verify pinout compatibility before substitution. Note differences in reset delay timer availability and output current capabilities between the original and substitute parts.