BU4319FVE-TR

Overview

The BU4319FVE-TR is a CMOS low-voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-channel power supply voltages. It features an adjustable reset delay timer and operates within a supply voltage range of 0.7 V to 7 V. The typical threshold detection voltage is 1.9 V with a precision of ±1%. The device draws a circuit current of 550 nA at the ON state and 400 nA at the OFF state when VDET is 4.8 V. It provides a low-active output with hysteresis defined as VDET x 0.05. The component supports an external delay circuit resistance up to 10.0 MΩ and functions reliably across a temperature range of -40°C to 125°C.

Feature Summary

• CMOS architecture ensures low power consumption suitable for battery-operated applications.
• Adjustable reset delay time allows customization via external resistance.
• High accuracy voltage detection with specified hysteresis prevents false triggering.

Applications

• Portable electronic devices requiring low standby current
• Battery-powered systems needing reliable under-voltage protection
• Embedded circuits utilizing adjustable timing sequences

Procurement Notes

Verify the specific suffix and package variant against the official datasheet before procurement, as availability may vary. Confirm that the intended application environment falls within the specified operating temperature range of -40°C to 125°C. Ensure compatibility with the required threshold voltage and delay timing parameters. Check for any recent lifecycle status updates from the manufacturer regarding production availability.

Selection Notes

Select this component when a single-channel voltage monitor with adjustable delay is required. Compare the 1.9 V threshold against system requirements to ensure proper reset activation. Evaluate the CMOS output type against load driving needs. Consider the VSOF-5 package dimensions for PCB layout constraints. Verify that the static current specifications meet the overall power budget of the design.

Part Context

This part belongs to the BU42(43)xxFVE series of supervisory circuits from ROHM Semiconductor. It is categorized under PMIC - Power Management ICs. The device serves as a voltage detector specifically optimized for low-voltage detection in compact surface-mount packages. It shares functional similarities with other parts in the BU43xx family but differs in package type and specific electrical characteristics.

Replacement Considerations

The BD5219G-1 is listed as a recommended replacement with the same pinout. Note differences in output type (Open drain vs CMOS) and supply voltage ranges. Verify thermal performance and package size compatibility before substitution.

FAQ

What is the maximum external resistance allowed for the adjustable delay timer?

The maximum delay circuit resistance supported by the BU4319FVE-TR is 10.0 MΩ.

Does the BU4319FVE-TR include a manual reset function?

No, the device does not feature a manual reset input; it relies on automatic power-on or undervoltage detection.