AD8642ARZ-REEL7

Overview

The AD8642ARZ-REEL7 is a dual-channel, low-power, precision JFET input operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail output capability and operates on single supplies from 5 V to 26 V or dual supplies from ±2.5 V to ±13 V. The device offers 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. It provides a gain bandwidth product of 3 MHz at 5 V and 3.5 MHz at ±13 V, with a slew rate of 2 V/μs and 3 V/μs respectively. The component is housed in an 8-lead SOIC package and functions within an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• JFET input architecture providing extremely low input bias current for high impedance signal interfacing.
• Rail-to-rail output stage enabling full dynamic range utilization in single-supply systems.
• Unity-gain stability without phase reversal when driving capacitive loads exceeding 500 pF.

Applications

• Photodiode amplifiers
• Precision current sensing
• Line- or battery-powered instruments

Procurement Notes

Verify the specific ordering suffix REEL7 corresponds to the reel packaging format required for automated assembly processes. Confirm that the RoHS compliant designation (Z) meets environmental regulations for the target deployment region. Ensure the 8-lead SOIC footprint matches the PCB layout specifications before finalizing procurement orders.

Selection Notes

Select this component for designs requiring low power consumption alongside high DC precision. The JFET input stage is suitable for applications demanding minimal loading on high-impedance sources. Verify that the 3 MHz bandwidth satisfies the AC performance requirements of the intended signal processing chain.

Part Context

This part belongs to the AD864x family of low power, rail-to-rail output, precision JFET amplifiers. The AD8642 variant specifically integrates two independent amplifiers within a single package, offering a compact solution for multi-channel signal conditioning tasks compared to single-channel alternatives.

Replacement Considerations

AD8642ARMZ

FAQ

Does the AD8642 support operation with inputs extending beyond the supply rails?

No, the input voltage range is limited to the supply rails (VS− to VS+). It does not feature over-the-top input capability.

What is the maximum capacitive load the output can drive while remaining stable?

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