BU4240F-TR

Overview

The BU4240F-TR is a 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 delay timer for reset timing control. The device provides a threshold detection voltage of 4.0 V with a precision accuracy of ±1%. It utilizes an open-drain output type and lacks manual reset or watchdog timer functionalities. The component is housed in a SOP-4 package and supports surface-mount installation. It functions reliably across a temperature range of -40°C to +125°C.

Feature Summary

• Adjustable delay timer functionality for customizable reset timing
• Open-drain output configuration for flexible interfacing
• High detection accuracy with ±1% precision threshold

Applications

• Power supply monitoring systems
• Microcontroller reset circuits
• Embedded system supervision

Procurement Notes

Verify the current lifecycle status as the component may be classified as obsolete or last-time buy. Confirm availability through authorized distributors, as stock levels vary. Ensure the SOP-4 package matches the target PCB footprint. Check RoHS compliance details if required for specific regulatory standards. Validate that the 4.0 V threshold aligns with the system's voltage requirements before procurement.

Selection Notes

Select this component when a fixed 4.0 V detection threshold is required with adjustable reset delay capabilities. The open-drain output suits designs needing external pull-up resistors. Consider the SOP-4 package size for space-constrained layouts. Verify that the operating temperature range meets environmental conditions. Note that manual reset and watchdog features are absent, requiring external implementation if needed.

Part Context

This part belongs to the BU42(43)xxF series of voltage detectors from ROHM Semiconductor. It is categorized under PMIC - Power Management ICs and specifically Supervisory Circuits. The device is designed for low-voltage detection applications, offering a balance between precision and flexibility through its adjustable delay feature. It serves as a critical component for ensuring stable operation in electronic systems by monitoring power supply integrity.

Replacement Considerations

The BD5240G-1TR is listed as a recommended replacement with the same pinout. Both devices share similar specifications including a 4.0 V detection voltage and adjustable delay timer. However, the replacement uses an SSOP-5 package instead of SOP-4, requiring layout adaptation. Verify electrical compatibility and thermal performance before substitution.