BU4927G-TR

Supervisors Overview

The BU4927G-TR is a CMOS voltage detector IC manufactured by Rohm Semiconductor, designed for monitoring single-channel power supply voltages. It features a fixed detection threshold of 2.7V with a precision of ±1%. The device operates within a supply voltage range of 0.7V to 7V and supports an active low reset output in a push-pull/totem pole configuration. It functions without manual reset or watchdog timer capabilities. The component is rated for industrial temperatures from -40°C to +125°C and consumes a typical operating current of 400µA at VDET=4.8V. It is housed in a compact 5-pin SSOP package.

Supervisors Feature Summary

• CMOS technology ensures low power consumption suitable for battery-operated applications.
• Fixed 2.7V detection threshold provides reliable under-voltage supervision.
• Push-pull output stage eliminates the need for external pull-up resistors.

Supervisors Applications

• Portable electronic devices requiring low standby current
• Battery-powered systems needing under-voltage protection
• General-purpose microprocessor reset circuits

Supervisors Procurement Notes

Verify the obsolete status before procurement, as this part is not recommended for new designs. Confirm that the replacement BD5227G-1TR meets functional requirements, noting differences such as open-drain output and adjustable delay. Ensure compatibility with existing PCB footprints and validate electrical parameters against the specific application needs prior to ordering.

Supervisors Selection Notes

Select this component only for legacy system maintenance or repair where the specific 2.7V threshold and push-pull output are required. Evaluate the BD5227G-1TR as the primary alternative, considering its open-drain output and adjustable delay features. Verify that the operating voltage range and temperature specifications align with the target environment constraints.

Supervisors Part Context

This component belongs to the BU4927 series of standard voltage detectors from Rohm Semiconductor. It is classified as a simple reset/power-on-reset circuit. The product line focuses on providing basic voltage supervision with minimal external components. The series includes variants with different thresholds and output configurations to support various power management requirements.

Supervisors Replacement Considerations

The BD5227G-1TR is a confirmed substitute with the same SSOP5 package. Note that it features an open-drain output instead of push-pull and includes an adjustable delay timer. Verify circuit compatibility regarding output drive capability and timing requirements when transitioning to the replacement part.

Supervisors FAQ

Is the BU4927G-TR recommended for new designs?

No, the component is marked as Not Recommended for New Designs (NRND) by the manufacturer.

Does the BU4927G-TR include a manual reset function?

No, the device does not support manual reset operations.