BU4942G-TR

Supervisors Overview

The BU4942G-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-input power supply voltages. 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 low-active CMOS output without manual reset or watchdog timer functions. It consumes a maximum static current of 550 nA and dissipates up to 540 mW. Operating temperatures span from -40°C to +125°C, housed in an SSOP-5 package.

Supervisors Feature Summary

• CMOS output interface providing low-active signal generation
• High accuracy voltage detection with ±1% threshold precision
• Ultra-low static current consumption for battery efficiency
• Wide operating temperature range suitable for industrial environments

Supervisors Applications

• Microprocessor power supply monitoring
• Portable battery-powered equipment supervision
• Multi-output power system tracking
• Test and measurement instrument voltage control

Supervisors Procurement Notes

Verify the specific ordering suffix and revision level against the official datasheet before procurement. Confirm that the SSOP-5 package dimensions match the target PCB footprint. Check RoHS compliance status as indicated in the latest documentation. Ensure the component lifecycle status is acceptable for the intended production timeline.

Supervisors Selection Notes

Select this component when a fixed 4.2 V threshold is required for single-channel voltage supervision. Consider the CMOS output drive capability and lack of delay timer for system timing requirements. Evaluate the 550 nA static current impact on overall system power budget. Verify compatibility with the 0.7 V minimum operating voltage of the monitored circuit.

Supervisors Part Context

This part belongs to the BU49xx series of standard voltage detectors from ROHM Semiconductor. It is specifically engineered for microprocessor reset circuits and power management applications. The series offers various threshold voltages while maintaining consistent package and electrical characteristics across models.

Supervisors Replacement Considerations

The BD5242G-1 is documented as a replacement with the same SSOP-5 package. Note differences in output type (Open drain vs CMOS) and reset delay capabilities. Verify pinout compatibility and electrical parameter alignment before substitution.