AD8666ARZ

Overview

The AD8666ARZ is a dual-channel, precision CMOS operational amplifier from Analog Devices. It features rail-to-rail output capability and operates on single supplies from 5 V to 16 V or dual supplies of ±2.5 V to ±8 V. The device offers a gain bandwidth product of 4 MHz and a slew rate of 3.5 V/µs. Key electrical characteristics include a maximum input offset voltage of 2.5 mV, low input bias current of 1 pA, and low noise density of 8 nV/√Hz at 10 kHz. It is housed in an 8-lead SOIC_N package and functions within an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Rail-to-rail output stage provides full signal swing across the supply range.
• Low input bias current minimizes loading effects on high-impedance sensor circuits.
• Unity-gain stable design ensures reliable performance in buffer configurations.
• Extended operating voltage range accommodates diverse power supply architectures.

Applications

• Sensor amplification
• Reference buffers
• Medical equipment
• Photodiode amplification
• ADC driver

Procurement Notes

Verify that the ordering suffix ARZ corresponds to the 8-Lead SOIC_N package option as specified in the manufacturer's ordering guide. Confirm RoHS compliance status for the specific batch. Ensure the procurement channel sources directly from authorized distributors to guarantee component authenticity and traceability. Cross-reference the part number against the latest datasheet revision B specifications before finalizing orders.

Selection Notes

Select this component when a dual-channel amplifier with rail-to-rail output is required for cost-sensitive applications. It serves as a suitable alternative to higher-priced JFET amplifiers due to its low input bias current and wide supply range. Consider the 4 MHz bandwidth and low noise profile for signal conditioning tasks involving high-impedance sensors or physiological measurements where precision is critical.

Part Context

This model belongs to the AD866x family of single-supply, rail-to-rail output amplifiers designed for low noise and low offset performance. The family includes the AD8665 (single), AD8666 (dual), and AD8668 (quad) variants. These devices are optimized for systems requiring wide operating voltage ranges up to 16 V while maintaining low power consumption and high input impedance characteristics.

Replacement Considerations

The AD8666ARMZ is a verified substitute offering identical electrical specifications but utilizing an 8-Lead MSOP package instead of the SOIC_N form factor. Designers must verify pinout compatibility and thermal dissipation requirements when transitioning between these package options.

FAQ

Does the AD8666ARZ exhibit phase reversal upon input overdrive?

No, the device is designed to prevent output phase reversal even when the input common-mode voltage exceeds the supply rails.

What is the maximum short-circuit output current rating?

The short-circuit output current is rated at ±19 mA for a 5 V supply and ±140 mA for a 16 V supply.