BU7291SG-TR

Overview

The BU7291SG-TR is a single-channel CMOS operational amplifier manufactured by ROHM Semiconductor. It features input and output full swing capabilities, allowing the output voltage to approach both supply rails within 0.1V. The device operates on a single power supply ranging from 2.4V to 5.5V with a typical circuit current of 0.47mA per channel. Key electrical characteristics include a gain-bandwidth product of 2.8MHz, a slew rate of 3V/µs, and an exceptionally low input bias current of 1pA typical. It provides a high DC voltage gain of 105dB and includes built-in electrostatic protection circuits.

Feature Summary

• Supports input and output full swing operation for maximum dynamic range in low-voltage applications.
• Features extremely low input bias current of 1pA typical, minimizing loading effects on high-impedance sources.
• Includes integrated phase compensation capacitor and internal electrostatic protection circuits.

Applications

• Low-voltage signal conditioning circuits
• Battery-powered portable electronic devices
• Sensor interface amplification

Procurement Notes

Verify the specific suffix 'SG' indicates the extended temperature range variant (-40°C to +105°C) compared to standard versions. Confirm package type SSOP-5 matches design requirements. Check RoHS compliance status and ensure ordering quantities align with tape-and-reel specifications provided by the manufacturer.

Selection Notes

Select this component when full-swing output is required near ground or positive rail voltages. The low input bias current makes it suitable for high-impedance sensor interfaces. Ensure the operating voltage stays within the 2.4V to 5.5V range. Consider the -40°C to +105°C temperature range if environmental conditions exceed standard commercial limits.

Part Context

This part belongs to the BU7291 series of low-voltage high-speed CMOS operational amplifiers. The SG suffix typically denotes an industrial temperature grade extension compared to standard commercial variants. It is designed for monolithic integration with internal phase compensation, simplifying external component requirements for stability.

Replacement Considerations

Direct pin-compatible substitutes may exist within the same family, such as the BU7291G-TR, though verification of temperature range and exact electrical parameters is required. Cross-reference with other single-channel full-swing op-amps ensuring matching supply voltage and package constraints.