AT8551/TR

Overview

The AT8551/TR is a single-channel, zero-drift CMOS operational amplifier manufactured by Analog Technologies, Inc. It features rail-to-rail input and output capabilities with a gain-bandwidth product of 4.5 MHz and a slew rate of 2.7 V/μs. The device operates on supply voltages ranging from +2.7V to +5.5V, consuming 640 μA per amplifier. Key electrical specifications include a maximum offset voltage of 5 μV, an input bias current of 50 pA, and a common-mode rejection ratio of 130 dB. It is housed in a SOT-23-5 package and functions within an extended temperature range of −40°C to +125°C.

Feature Summary

• Utilizes auto-zeroing techniques to achieve ultralow offset voltage and near-zero drift over time and temperature variations.
• Provides rail-to-rail input and output swing capability for maximum dynamic range operation.
• Features high gain, high common-mode rejection ratio (CMRR), and high power-supply rejection ratio (PSRR).
• Designed for fast overload recovery and low quiescent power consumption.

Applications

• Temperature and pressure sensor signal amplification
• Weight scale and strain gauge instrumentation
• Medical and industrial precision measurement equipment
• Handheld test instruments requiring battery efficiency
• Precision current sensing circuits

Procurement Notes

Verify the specific package configuration required for your design, as the AT8551 series is available in multiple form factors including SOT-23-5, SOIC-8, and MSOP-8. Confirm that the ordering suffix matches the desired reel quantity and packaging type. Ensure compatibility with your PCB footprint before finalizing procurement orders.

Selection Notes

Select this component when system requirements demand minimal offset voltage drift without external trimming. It serves as a direct drop-in replacement for similar zero-drift amplifiers like the AD8551. Consider the 4.5 MHz bandwidth and 2.7 V/μs slew rate for applications requiring moderate speed alongside high DC precision.

Part Context

This part belongs to the AT8551/AT8552 family of zero-drift RRIO CMOS operational amplifiers. The AT8551 represents the single-amplifier version, while the AT8552 provides dual amplifiers in the same technology node. Both variants share identical core performance characteristics regarding noise, drift, and power consumption.

Replacement Considerations

The datasheet explicitly identifies the AT8551 as an upgraded drop-in replacement for the AD8551. Designers should verify pinout compatibility and ensure that the supply voltage limits remain within the specified 2.7V to 5.5V range during substitution.

FAQ

Does the AT8551 require external capacitors for stability?

No, the device is unity-gain stable and does not require external capacitors for basic operation, though a 0.1µF capacitor across supply pins is recommended for optimal performance.

What is the maximum supply voltage for the AT8551?

The operating supply voltage range is +2.7V to +5.5V. The absolute maximum rating between V+ and V− is 7.0V; exceeding this may cause permanent damage.