AD8551ARM-REEL

Overview

The AD8551ARM-REEL is a single-channel, zero-drift operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output swings and operates on a single supply voltage ranging from 2.7 V to 5 V. The device exhibits an ultralow offset voltage of 1 μV with a drift of 0.005 μV/°C across the industrial temperature range of −40°C to +125°C. Key electrical parameters include a gain bandwidth product of 1.5 MHz at 5 V, a slew rate of 0.4 V/μs, and a typical supply current of 975 μA. It provides high common-mode rejection ratio (CMRR) and power supply rejection ratio (PSRR) exceeding 130 dB.

Feature Summary

• Zero-drift architecture utilizing auto-zero stabilization to maintain ultralow offset voltage and minimal drift over temperature.
• Rail-to-rail input and output capability allowing full signal swing within the supply voltage range.
• High open-loop gain and exceptional common-mode and power supply rejection ratios exceeding 130 dB.
• Ultralow input bias current and low supply current consumption suitable for precision applications.

Applications

• Temperature sensors
• Pressure sensors
• Precision current sensing
• Strain gage amplifiers
• Medical instrumentation

Procurement Notes

Verify the specific package suffix 'RM' corresponds to the 8-lead MSOP configuration required for your design. Confirm that the '-REEL' designation indicates tape-and-reel packaging rather than tube or cut tape. Ensure the operating environment stays within the specified -40°C to +125°C range to guarantee performance against the documented offset drift specifications.

Selection Notes

Select this component when sub-microvolt offset stability is critical without external trimming. The rail-to-rail I/O makes it suitable for low-voltage single-supply systems where signal integrity near the rails is required. Consider the 1.5 MHz bandwidth and 0.4 V/μs slew rate for moderate-speed precision applications. Verify that the 8-lead MSOP footprint matches your PCB layout constraints.

Part Context

This part belongs to the AD855x family of zero-drift amplifiers, which includes dual (AD8552) and quad (AD8554) variants. The AD8551 is the single-channel version designed for cost-sensitive, high-precision applications. It replaces older chopper-stabilized designs by offering similar accuracy without requiring external capacitors, simplifying the circuit design while maintaining high performance in harsh environments.

Replacement Considerations

Direct pin-compatible substitutes within the same family include the AD8552ARZ-REEL (dual channel) and AD8554ARZ-REEL (quad channel). For single-channel replacements, verify if other Analog Devices zero-drift op-amps meet the specific 2.7 V to 5 V supply and MSOP package requirements.

FAQ

Does the AD8551 require external capacitors for its auto-zero function?

No, the AD8551 utilizes an internal auto-zero topology that does not require external capacitors for operation.

What is the maximum supply voltage for the AD8551?

The absolute maximum supply voltage rating is 6 V, but the guaranteed operating range is 2.7 V to 5 V.