AD8661ARZ

Overview

The AD8661ARZ is a single-channel, rail-to-rail output operational amplifier manufactured by Analog Devices Inc. It utilizes DigiTrim® technology to achieve low offset voltage and operates on a single supply voltage ranging from 5 V to 16 V. Key electrical parameters include a maximum input offset voltage of 100 µV at 5 V, a maximum input bias current of 1 pA, and a gain-bandwidth product of 4 MHz. The device features a slew rate of 3.5 V/µs and an output current capability of 140 mA per channel. It is housed in an 8-SOIC package with a width of 3.90 mm and supports an extended industrial operating temperature range from -40°C to +125°C.

Feature Summary

• DigiTrim® patented adjustment technology ensures low offset voltage without requiring laser trimming.
• Rail-to-rail output capability combined with wide 5 V to 16 V single-supply operation.
• Extremely low input bias current suitable for high-impedance sensor interfaces.

Applications

• Photodiode amplification systems
• Analog-to-digital converter (ADC) drivers
• Medical monitoring equipment

Procurement Notes

Verify the specific suffix 'ARZ' to confirm the narrow-body 8-SOIC package variant and RoHS compliance status. Confirm that the required operating temperature range matches the extended industrial specification (-40°C to +125°C), as other package options within the AD8661 family may have different thermal ratings. Ensure design compatibility with the 140 mA output drive requirement.

Selection Notes

Select this component when a single-channel amplifier with rail-to-rail output is required for single-supply applications up to 16 V. It is appropriate for designs needing low offset and bias current but does not require the higher bandwidth or multi-channel configurations offered by the AD8662 or AD8664 variants. Verify that the 4 MHz gain-bandwidth product meets the signal frequency requirements.

Part Context

The AD8661ARZ belongs to the AD8661/AD8662/AD8664 family of precision CMOS amplifiers. While the AD8662 provides dual channels and the AD8664 provides quad channels, the AD8661 specifically offers a single-channel configuration. All members share the same core DigiTrim® architecture and performance characteristics, differing primarily in channel count and pinout compatibility.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.