BU4311F-TR

Overview

The BU4311F-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for low-voltage detection applications. It features an adjustable reset delay time and operates within a supply voltage range of 0.7 V to 7 V. The typical under-voltage detection threshold is 1.1 V with a precision of ±1%. The device consumes a maximum operating current of 550 nA and has a power dissipation rating of 400 mW. It provides a CMOS output type with a low active state and includes hysteresis voltage defined as VDET x 0.05. The component supports an external delay circuit resistance of 10.0 MΩ and functions reliably across a temperature range of -40°C to +125°C.

Feature Summary

• CMOS output structure with low active state for digital system supervision
• Adjustable reset delay timer utilizing external resistance components
• Ultra-low static current consumption suitable for battery-powered devices
• High accuracy voltage detection with specified hysteresis characteristics

Applications

• Portable electronic equipment requiring low voltage monitoring
• Battery-operated systems needing power failure detection
• Microprocessor reset circuits in consumer electronics
• Industrial control units operating in extended temperature ranges

Procurement Notes

Verify the specific ordering suffix and package variant against the official ROHM datasheet before procurement. Confirm that the selected part number matches the required detection voltage and delay configuration. Check the current supply status as this component may be subject to lifecycle changes or obsolescence notices. Ensure compatibility with existing PCB footprint and soldering processes for SOP-4 packages. Cross-reference RoHS compliance requirements with project specifications.

Selection Notes

Select the BU4311F-TR when a precise 1.1 V detection threshold with high accuracy is required for supervisory applications. Consider the adjustable delay feature if noise immunity during power-up sequences is critical. Evaluate the ultra-low current consumption benefits for energy-constrained designs. Verify that the CMOS output drive capability meets the load requirements of the connected logic gates. Assess the operating temperature range suitability for the intended environmental conditions.

Part Context

This component belongs to the BU42(43)xxF series of voltage detectors from ROHM Semiconductor. The series is characterized by CMOS technology offering low power consumption and high reliability. These devices are engineered for compact surface-mount installations in modern electronic assemblies. The family provides various detection thresholds to accommodate different system voltage levels.

Replacement Considerations

The BD5211G-1 is documented as a recommended replacement with similar specifications. Note that the substitute utilizes an SSOP5 package rather than the original SOP4 form factor. Pinout compatibility should be verified during design integration. The replacement offers comparable detection voltage and delay functionality.