BU4942F-TR

Supervisors Overview

The BU4942F-TR is a CMOS 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 a typical under-voltage detection threshold of 4.2 V with ±1% precision. The device provides a CMOS output type with a low reset active state and includes no manual reset or watchdog timer functions. It consumes 0.40 μA in the ON state and 0.55 μA in the OFF state at VDET=4.8V. The component supports an operating temperature range from -40°C to 125°C and is housed in a compact SOP-4 package measuring 2.0x2.1 mm.

Supervisors Feature Summary

• CMOS output interface providing digital voltage monitoring signals
• High accuracy voltage detection with ±1% precision tolerance
• Low power consumption suitable for battery-operated systems
• Compact SOP-4 surface mount packaging for space-constrained designs

Supervisors Applications

• Portable electronic devices requiring voltage supervision
• Battery-powered equipment needing under-voltage protection
• General-purpose supervisory circuits in consumer electronics
• Industrial control systems operating within specified temperature ranges

Supervisors Procurement Notes

Verify current availability status as the component may be subject to last-time-buy restrictions. Confirm RoHS compliance details through official datasheets before integration. Ensure ordering suffix matches required packaging specifications. Cross-reference pinout compatibility if replacing existing designs. Validate thermal performance against application requirements.

Supervisors Selection Notes

Select this component when a precise 4.2 V detection threshold is required with minimal quiescent current. Consider the CMOS output drive capability for direct logic interfacing. Evaluate the SOP-4 footprint constraints against PCB layout limitations. Compare hysteresis characteristics against noise immunity requirements in the target environment.

Supervisors Part Context

This part belongs to the BU4941F series of standard voltage detectors from ROHM Semiconductor. It shares functional similarities with other members of the family but differs in specific detection thresholds and package options. The series targets cost-sensitive applications requiring reliable power management without complex configuration.

Supervisors Replacement Considerations

BD5242G-1 is listed as a similar specification replacement with SSOP-5 packaging. Verify pinout compatibility and output type differences (Open drain vs CMOS) before substitution.