AD8638ARJZ-REEL7

Overview

The AD8638ARJZ-REEL7 is a single-channel, auto-zero operational amplifier manufactured by Analog Devices Inc. in a 5-lead SOT-23 package. It operates on a single supply of 5 V to 16 V or dual supplies of ±2.5 V to ±8 V. Key electrical parameters include a maximum offset voltage of 9 μV, a typical gain bandwidth product of 1.5 MHz, and a maximum input bias current of 40 pA at 25°C. The device features rail-to-rail output swing, low noise density of 60 nV/√Hz, and high common-mode rejection ratio (CMRR) of 133 dB.

Feature Summary

• Utilizes a patented auto-zeroing topology to achieve extremely low offset voltage and drift without requiring external capacitors.
• Provides rail-to-rail output swing to maximize signal-to-noise ratio within the specified supply voltage range.
• Greatly reduces digital switching noise typically found in chopper-stabilized amplifiers through optimized internal architecture.

Applications

• Pressure and position sensors
• Strain gage amplifiers
• Medical instrumentation
• Thermocouple amplifiers

Procurement Notes

Verify that the ordering suffix REEL7 corresponds to the reel packaging format required for your assembly line. Confirm the specific SOT-23-5 pinout matches your PCB footprint design. Ensure the component meets RoHS compliance standards if mandated by your regional regulations. Cross-reference the manufacturer part number with official distributor catalogs to validate authenticity before procurement.

Selection Notes

Select this component when high DC precision is required alongside low power consumption in a compact surface-mount package. It is suitable for applications needing rail-to-rail output capability without the complexity of external filtering for chopper noise. Consider the extended industrial temperature range specifications if the operating environment varies significantly.

Part Context

The AD8638 is part of the AD8638/AD8639 series of wide bandwidth, auto-zero amplifiers from Analog Devices. While the AD8639 offers dual channels, the AD8638 provides a single channel configuration. This series combines the benefits of zero-drift performance with low cost and low noise, eliminating the need for external capacitors often required by other precision amplifier topologies.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

Does the AD8638 require external capacitors for its auto-zero function?

No, the AD8638 utilizes an internal topology that does not require external capacitors for operation.

What is the maximum input bias current specification?

The maximum input bias current is 40 pA at 25°C, increasing to 105 pA over the full temperature range.