BU4820F-TR

Supervisors Overview

The BU4820F-TR is a single-channel voltage detector manufactured by Rohm Semiconductor, designed for supervising power supply voltages in electronic circuits. It operates within a supply voltage range of 0.7 V to 7 V and features a fixed detection threshold of 2 V with ±1% accuracy. The device provides an open-drain output that asserts a low-active reset signal when the monitored voltage falls below the threshold. It supports a wide operating temperature range from -40°C to +125°C and is housed in a compact 4-SOP (SC-82) surface-mount package.

Supervisors Feature Summary

• Provides simple reset or power-on reset functionality via an open-drain output interface.
• Delivers high precision voltage monitoring with a typical accuracy of ±1%.
• Operates across a broad industrial temperature range suitable for diverse environmental conditions.

Supervisors Applications

• Monitoring battery voltage levels in portable electronic devices
• Supervising microprocessor power supplies for system stability
• Ensuring correct initialization sequences in embedded systems

Supervisors Procurement Notes

Verify component authenticity through authorized distributors due to end-of-life status. Confirm package integrity upon receipt as the unit is obsolete. Cross-reference datasheet specifications against current design requirements before integration. Ensure storage conditions maintain moisture sensitivity level 1 compliance. Validate replacement compatibility if sourcing alternatives for existing production lines.

Supervisors Selection Notes

Select this component for applications requiring precise 2V threshold monitoring with minimal quiescent current consumption. The open-drain output allows flexible interfacing with various logic families. Consider the 4-SOP package dimensions for PCB layout constraints. Evaluate thermal performance within the specified -40°C to +125°C operational range. Assess suitability for non-critical reset functions where adjustable delay timers are unnecessary.

Supervisors Part Context

The BU4820 series represents Rohm's standard voltage detector lineup, offering reliable supervision for single-rail power systems. This specific variant utilizes a fixed threshold architecture without manual reset or watchdog capabilities. It serves as a cost-effective solution for basic power management tasks in consumer and industrial electronics where high precision and wide temperature tolerance are required.

Supervisors Replacement Considerations

BD5220G-1TR is a recommended replacement with identical SSOP5 packaging and similar 2.0V detection voltage. The substitute offers improved precision at ±0.9% and includes an adjustable delay timer feature. Verify pinout compatibility and electrical parameter alignment during transition planning.