AD8641ARZ-REEL

Overview

The AD8641ARZ-REEL is a single-channel, low power, precision JFET input operational amplifier manufactured by Analog Devices. It features rail-to-rail output capability and operates on a single supply of 5 V to 26 V or dual supplies of ±2.5 V to ±13 V. Key electrical specifications include a maximum offset voltage of 750 µV, a maximum input bias current of 1 pA, and a gain bandwidth product of 3.5 MHz at ±13 V. The device draws a typical supply current of 200 µA and maintains stability with capacitive loads exceeding 500 pF.

Feature Summary

• Extremely low input bias current characteristic of JFET technology
• Rail-to-rail output swing capability for wide dynamic range
• Unity-gain stable without phase reversal issues
• Capable of buffering CMOS DACs and ASICs in single-supply systems

Applications

• Photodiode amplifiers
• Precision current sensing
• Battery-powered instrumentation
• Industrial controls

Procurement Notes

Verify the specific package option R-8 (8-Lead Standard Small Outline Package) matches the design requirements. Confirm RoHS compliance status indicated by the 'Z' suffix. Ensure the reel packaging format aligns with automated assembly equipment capabilities before finalizing procurement orders.

Selection Notes

Select this component when low input bias current and high precision are required alongside low power consumption. The rail-to-rail output allows for maximum signal swing in single-supply applications. Verify that the 3.5 MHz gain bandwidth product meets the frequency response needs of the target circuit design.

Part Context

This part belongs to the AD8641/AD8642/AD8643 family of low power, precision JFET amplifiers. While the AD8642 offers dual channels and the AD8643 provides quad channels, the AD8641 is configured as a single amplifier. All variants share similar electrical characteristics and thermal performance profiles within the extended industrial temperature range.

Replacement Considerations

Direct functional substitutes within the same family include the AD8642ARZ-REEL for dual-channel applications and the AD8643ARZ-REEL for quad-channel configurations. Other packages such as KS-5 or RM-8 may be considered if pin compatibility and board space allow.