AD8666ARZ-REEL7

Overview

The AD8666ARZ-REEL7 is a dual-channel, rail-to-rail output CMOS operational amplifier from Analog Devices. It operates on single supplies of 5 V to 16 V or dual supplies of ±2.5 V to ±8 V. Key electrical parameters include a maximum offset voltage of 2.5 mV and a maximum input bias current of 1 pA. The device features a gain bandwidth product of 4 MHz and a slew rate of 3.5 V/μs. Voltage noise density is specified at 10 nV/√Hz at 1 kHz and 8 nV/√Hz at 10 kHz. Supply current per amplifier ranges from 1.1 mA to 2.0 mA across the operating temperature range of −40°C to +125°C.

Feature Summary

• Rail-to-rail output capability with unity-gain stability
• Low input bias current of 1 pA maximum
• Extended supply voltage operation up to 16 V
• Low noise performance suitable for precision applications

Applications

• Sensor amplification
• Photodiode amplification
• Medical equipment signal conditioning
• ADC drivers
• Reference buffers

Procurement Notes

Verify the specific package option against the ordering guide, as the REEL7 suffix indicates tape and reel packaging in the 8-Lead SOIC_N (R-8) format. Confirm RoHS compliance status via the Z suffix designation. Ensure the automotive grade variants are distinguished if required by application reliability standards. Cross-reference the datasheet revision B specifications for accurate parameter validation during component selection.

Selection Notes

Select this component when low input bias current and wide supply voltage range are critical requirements. The dual-channel configuration offers space efficiency compared to single-channel alternatives. Consider the 4 MHz bandwidth for moderate-speed signal processing tasks. Evaluate thermal resistance characteristics for the SOIC-8 package under expected load conditions to ensure reliable operation within the extended industrial temperature limits.

Part Context

This part belongs to the AD866x family of low-cost, low-noise, rail-to-rail output amplifiers. The family includes single-channel (AD8665), dual-channel (AD8666), and quad-channel (AD8668) variants. These devices utilize CMOS technology to achieve high input impedance and low power consumption while maintaining precision performance metrics suitable for cost-sensitive applications typically requiring JFET amplifiers.

Replacement Considerations

The AD8666WARZ-R7 serves as an automotive qualified alternative within the same package and pinout configuration. Designers should verify that any substitute meets the specific electrical tolerances and reliability requirements of the target application.