Analog Devices Inc. AD8667ARMZ

Overview

AD8667ARMZ from Analog Devices is a dual, rail-to-rail output, precision CMOS operational amplifier optimized for low-noise, low-input-bias-current sensor signal conditioning. It delivers 175 µV max offset voltage, 23 nV/√Hz voltage noise, and 300 fA typical input bias current at 5 V supply, operating from 5 V to 16 V. It is used in photodiode amplification, pH meter front ends, and low-power ADC driver stages.

For engineers reviewing the AD8667ARMZ datasheet, AD8667ARMZ pinout, AD8667ARMZ application, or AD8667ARMZ equivalent, this page provides verified specifications, MSOP-8 package details, real-world application context, and validated alternative options for precision analog design.

Technical Context

The AD8667ARMZ implements Analog Devices' DigiTrim® trimming for stable low-offset performance across −40°C to +125°C. Its CMOS input stage enables femtoampere-level bias current and high input impedance, critical for electrometer-grade transimpedance amplifiers and high-Z sensor interfaces.

It supports single-supply operation up to 16 V with rail-to-rail output swing (e.g., 15.95 V high / 25 mV low at 100 µA load), 540 kHz gain bandwidth, and 0.3 V/µs slew rate - enabling accurate dc-coupled gain, offset adjustment, and active filtering in medical diagnostics and industrial instrumentation.

Key Specifications

Pinout & Package

AD8667ARMZ is housed in an 8-lead MSOP (RM-8) package (3.0 mm × 3.0 mm, 0.85 mm height) with exposed pad connected to V− or left floating per datasheet guidance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision op amp applications.

Compared with OP2177ARZ and ADA4522-2ARMZ, the AD8667ARMZ uniquely balances femtoampere input bias, 23 nV/√Hz noise, and 5–16 V single-supply operation - making it optimal for high-impedance, battery-operated sensor front ends where both dc precision and ac fidelity matter.

Availability

AD8667ARMZ is available at Aetrix Electronics and suitable for photodiode amplification, pH/ORP meter front ends, and low-power ADC driver applications requiring stable component supply across industrial and medical product lifecycles.

Supply support for AD8667ARMZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD866x family targets precision, low-power, rail-to-rail op amps for sensor signal conditioning in harsh environments - emphasizing low offset, ultra-low input bias, and extended temperature operation.

FAQ

What is the maximum supply voltage for AD8667ARMZ?

The AD8667ARMZ supports a maximum supply voltage of 18 V absolute maximum, with recommended operation up to 16 V. At 16 V, it delivers rail-to-rail output swing (e.g., 15.95 V high / 25 mV low at 100 µA load) and maintains 540 kHz gain bandwidth. Exceeding 16 V risks exceeding absolute maximum ratings and degrading long-term reliability.

Does AD8667ARMZ require external compensation for unity-gain stability?

No, the AD8667ARMZ is internally compensated for unity-gain stability across its full operating range (5 V to 16 V). It achieves ≥60° phase margin with 20 pF capacitive load and exhibits no peaking or oscillation in standard non-inverting or inverting configurations - eliminating need for external compensation components in most designs.

How is the exposed pad on the AD8667ARMZ MSOP package configured?

The exposed pad on the AD8667ARMZ (RM-8 package) must be connected to V− or left unconnected - it must not be tied to ground or any other potential. Per Analog Devices' datasheet Figure 3 and Note 2, this connection improves thermal dissipation and electrical performance; soldering it to V− reduces θJA from 145°C/W to an effective lower value in typical PCB layouts.

Can AD8667ARMZ drive capacitive loads directly?

The AD8667ARMZ can drive up to 200 pF capacitive load while maintaining ≥60° phase margin and minimal overshoot (<10%), as verified in Figures 25 and 28 of the datasheet. For loads >200 pF, isolation resistance (e.g., 10–100 Ω in series with output) is recommended to preserve stability without degrading bandwidth significantly.

What is the guaranteed input offset voltage drift over temperature for AD8667ARMZ?

The AD8667ARMZ guarantees input offset voltage drift of 1.5 µV/°C minimum to 5 µV/°C maximum across −40°C to +125°C. This tight drift spec ensures predictable, low-drift performance in uncalibrated systems - critical for pH meters and thermocouple amplifiers where ambient temperature varies widely during operation.