AD8643ACPZ-REEL

Overview

The AD8643ACPZ-REEL7 is a quad precision JFET operational amplifier from Analog Devices, housed in a 16-lead LFCSP package. It features low supply current of 250 μA max and very low input bias current of 1 pA max. The device supports single-supply operation from 5 V to 26 V or dual-supply operation from ±2.5 V to ±13 V. Key electrical characteristics include a maximum offset voltage of 750 μV, a gain bandwidth product of 2.5 MHz, and a slew rate of 2 V/μs at 5 V supplies. It offers rail-to-rail output capability and operates over an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Extremely low input bias current for high-impedance signal applications
• Rail-to-rail output swing capability
• Low power consumption suitable for heat-sensitive designs
• Unity-gain stable with no phase reversal

Applications

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

Procurement Notes

Verify the specific ordering suffix REEL7 corresponds to the reel packaging format required for your assembly line. Confirm that the ACPZ variant matches the 16-lead LFCSP footprint on your PCB layout. Ensure the RoHS compliant status aligns with your manufacturing standards. Cross-reference the manufacturer part number with official distributor catalogs to validate authenticity before procurement.

Selection Notes

Select this component when designing circuits requiring multiple channels with minimal power dissipation and low bias currents. The quad configuration reduces board space compared to single-channel alternatives. Consider the LFCSP package for compact designs where thermal management via the exposed pad is feasible. Verify that the 2.5 MHz bandwidth meets the signal processing requirements of the target application.

Part Context

This part belongs to the AD8641/AD8642/AD8643 family of low power, rail-to-rail output, precision JFET amplifiers. While the AD8641 provides one channel and the AD8642 provides two, the AD8643 integrates four amplifiers in a single package. All variants share similar electrical specifications but differ in channel count and available package options such as SOIC, MSOP, and SC70.

Replacement Considerations

Direct substitutes within the same family include the AD8641ACPZ-REEL7 (single channel) and AD8642ACPZ-REEL7 (dual channel), though pin counts and functionality differ. For quad configurations, verify if other manufacturers offer equivalent JFET input amplifiers with matching rail-to-rail outputs and low bias currents.