AD8634HFZ

Overview

The AD8634HFZ is a quad zero-drift operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output capabilities, supporting supply voltages from ±2.5 V to ±15 V or a single 5 V to 30 V source. The device operates within an extended temperature range of −40°C to +210°C. Key electrical specifications include a maximum input offset voltage of 3 µV, a maximum input bias current of 75 pA, and a gain-bandwidth product of 1.5 MHz. It delivers a typical slew rate of 2.5 V/µs and consumes approximately 3 mA of supply current per amplifier.

Feature Summary

• Zero-drift architecture utilizing Auto-Zero technology to minimize offset voltage drift over time and temperature.
• Rail-to-rail input and output stages enabling full signal swing capability across the entire supply range.
• Extended high-temperature operation rated for environments up to +210°C.
• High precision performance with ultra-low input bias current and low noise density.

Applications

• High-precision thermocouple amplification
• RTD (Resistance Temperature Detector) signal conditioning
• Strain gauge measurement systems
• Medical instrumentation requiring high stability

Procurement Notes

Verify that the specific part number AD8634HFZ corresponds to the ceramic flat package variant intended for extreme temperature applications. Confirm RoHS compliance status as indicated by the suffix. Ensure compatibility with the required operating temperature range before finalizing procurement orders.

Selection Notes

Select this component when application requirements demand stable DC performance at temperatures exceeding standard industrial limits. The ceramic package provides necessary thermal resilience compared to plastic variants. Consider the quad configuration if multiple channels are needed in a compact footprint.

Part Context

This device belongs to the AD863x family of precision amplifiers, which includes single, dual, and quad channel versions. The HFZ designation specifically identifies the high-temperature ceramic flat package option, distinguishing it from standard plastic packages like the HRZN variant found in the same series.

Replacement Considerations

The AD8634HRZN serves as a pin-compatible alternative within the same family but is rated for a lower maximum temperature of +175°C. Verify thermal requirements before substituting.