AD8642ARZ-REEL

Overview

The AD8642ARZ-REEL is a dual-channel, low-power precision JFET operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail output capability and unity-gain stability without phase reversal. The device operates on single supplies from 5 V to 26 V or dual supplies from ±2.5 V to ±13 V. Key electrical specifications include a maximum supply current of 250 μA per amplifier, a maximum input bias current of 1 pA, and a maximum offset voltage of 750 μV. The gain bandwidth product is 3.5 MHz with a slew rate of 3 V/μs at ±13 V. It is housed in an 8-lead SOIC package.

Feature Summary

• Extremely low input bias current characteristic of JFET technology
• Rail-to-rail output swing capability
• Unity-gain stable operation without phase reversal
• Low power consumption suitable for battery-powered systems

Applications

• Line- or battery-powered instruments
• Photodiode amplifiers
• Precision current sensing
• Medical instrumentation
• Industrial controls

Procurement Notes

Verify the specific ordering suffix REEL against the manufacturer's official documentation to confirm tape-and-reel packaging and quantity specifications. Ensure the component matches the required RoHS compliance status indicated by the Z suffix. Cross-reference the pinout configuration for the 8-lead SOIC package during integration planning.

Selection Notes

Select this component for applications requiring high DC precision combined with low quiescent current. The JFET input stage provides superior bias current performance compared to CMOS alternatives. Verify that the load capacitance requirements remain within the stability limits specified for capacitive loading in the datasheet.

Part Context

This part belongs to the AD864x family of precision amplifiers, which includes the single-channel AD8641 and quad-channel AD8643 variants. All members share similar electrical characteristics but differ in channel count and available package options such as SC70, MSOP, and LFCSP.

Replacement Considerations

Direct functional substitutes within the same family include the AD8641 (single channel) and AD8643 (quad channel). Other packages for the dual-channel variant include AD8642ARMZ (MSOP).

FAQ

Does the AD8642 exhibit phase reversal when the input signal exceeds the common-mode range?

No, the AD8642 is designed to be free of phase reversal issues even when inputs exceed the supply rails.

What is the maximum capacitive load the AD8642 can drive stably?

The outputs remain stable with capacitive loads of more than 500 pF.