BU4242FVE-TR

Overview

The BU4242FVE-TR is a single-channel voltage detector manufactured by Rohm Semiconductor, designed for supervisory circuit applications. It operates within a supply voltage range of 0.7 V to 7 V and features an adjustable reset delay timer. The device provides an open-drain output with low-active reset logic. Key electrical parameters include a typical under-voltage detection threshold of 4.2 V, hysteresis defined as VDET multiplied by 0.05, and accuracy of ±1%. Circuit current consumption is specified at 0.40 μA (ON) and 0.55 μA (OFF) at VDET=4.8V. It supports L-output currents of 3.3 mA (LowVol) and 6.5 mA (HighVol). The component is housed in a VSOF-5 package and functions across a temperature range of -40°C to 125°C.

Feature Summary

• Features an adjustable reset delay timer allowing customizable timing configurations via external components.
• Provides open-drain output capability suitable for interfacing with various digital logic families.
• Includes built-in hysteresis to prevent output oscillation during power supply transitions.

Applications

• Power supply monitoring in portable electronic devices
• Microcontroller system reset generation
• Battery backup switching circuits

Procurement Notes

Verify the specific suffix and tape-and-reel configuration against current manufacturer documentation, as availability may vary. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer, noting that end-of-life status can impact long-term sourcing reliability.

Selection Notes

Select this component when a low-power, single-channel voltage detector with adjustable delay is required. Ensure the 4.2 V detection threshold aligns with the target system's minimum operating voltage. Verify that the open-drain output drive strength meets the load requirements of the connected circuitry.

Part Context

This part belongs to the BU42xx series of CMOS voltage detectors from Rohm Semiconductor. These devices are engineered for low standby current consumption and high precision, making them suitable for battery-operated equipment. The VSOF-5 package offers a compact footprint for space-constrained designs.

Replacement Considerations

BD5242G-1 is identified as a recommended replacement with the same pinout. Note that the BD5242G-1 utilizes an SSOP5 package rather than VSOF-5, requiring mechanical layout adjustments during substitution.