BU4911G-TR

Supervisors Overview

The BU4911G-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-input power supply lines. It operates within a supply voltage range of 0.7 V to 7 V and features a typical under-voltage detection threshold of 1.1 V with ±1% precision. The device provides a low-active CMOS output without manual reset or watchdog timer functions. It consumes 400 nA in the ON state and 550 nA in the OFF state at VDET=4.8V, housed in an SSOP-5 package suitable for surface mount applications across a temperature range of -40°C to +125°C.

Supervisors Feature Summary

• CMOS output structure providing low-power operation for battery-sensitive systems
• High accuracy voltage detection with ±1% tolerance on the threshold voltage
• Compact SSOP-5 surface mount packaging for space-constrained designs

Supervisors Applications

• Portable electronic devices requiring low standby current
• Battery-powered equipment needing reliable power failure detection
• Embedded systems utilizing single-supply voltage monitoring

Supervisors Procurement Notes

Verify component authenticity through authorized distributors as this part is marked Not Recommended for New Designs (NRND). Confirm package integrity upon receipt, as the SSOP-5 form factor requires careful handling during assembly. Ensure design updates are planned due to the discontinued status for new projects.

Supervisors Selection Notes

Select this component when a fixed 1.1 V threshold is required for single-channel supervision. Compare against the BD5211G-1 if adjustable delay or open-drain output is needed instead of the standard CMOS configuration. Evaluate the NRND status carefully to ensure long-term availability aligns with product lifecycle requirements.

Supervisors Part Context

This part belongs to the BU4911 series of standard voltage detectors from ROHM. It serves as a legacy solution for basic power management tasks where high precision and low quiescent current are prioritized over advanced features like watchdog timers or manual resets.

Supervisors Replacement Considerations

The BD5211G-1 is documented as a similar level replacement with the same SSOP-5 package. Note that the substitute offers an open-drain output and adjustable delay, differing from the original's fixed CMOS output.