Analog Devices Inc. AD8604ARQZ-RL

Overview

AD8604ARQZ-RL from Analog Devices is a quad, rail-to-rail input/output precision CMOS operational amplifier optimized for single-supply operation from 2.7 V to 5.5 V. It delivers 8 MHz gain bandwidth, 5 V/µs slew rate, 500 µV max offset voltage (A grade), 750 µA/amplifier supply current, and operates across −40°C to +125°C - enabling high-accuracy signal conditioning in battery-powered instrumentation, sensor interfaces, and multipole filters.

For engineers reviewing the AD8604ARQZ-RL datasheet, AD8604ARQZ-RL pinout, AD8604ARQZ-RL application, or AD8604ARQZ-RL equivalent, this page provides verified technical context, package-specific pin definitions, real-world use-value mapping, and validated alternative options for precision analog design in space-constrained, low-voltage systems.

Technical Context

The AD8604ARQZ-RL employs Analog Devices' DigiTrim® post-package trimming to achieve sub-millivolt offset without laser trimming - correcting mechanical stress-induced errors in the 16-lead QSOP (RQ) package. Its dual-input-stage architecture (NMOS + PMOS differential pairs) enables true rail-to-rail common-mode input range (0 V to V_S) and rail-to-rail output swing (within 15 mV of rails at 1 mA load).

It features unity-gain stability, no phase reversal, and low distortion (THD+N < 0.001% at 1 kHz), with open-loop gain of 80 dB typical into 2 kΩ. Input bias current remains ≤60 pA (typ) across temperature, supporting high-impedance sensor front-ends and photodiode amplifiers without significant DC error.

Key Specifications

Pinout & Package

AD8604ARQZ-RL is housed in a 16-lead Shrink Small Outline QSOP (RQ suffix), measuring 4.4 mm × 3.9 mm × 1.4 mm, with standard SOIC-compatible footprint and gull-wing leads. Thermal resistance θ_JA = 115°C/W (4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8604ARQZ-RL, OPA4340UA offers superior DC precision and noise but sacrifices speed and automotive compliance, while TSV914IQDT trades offset and temperature range for extreme power efficiency - making AD8604ARQZ-RL the balanced choice for high-fidelity, high-reliability, single-supply analog signal chains.

Availability

AD8604ARQZ-RL is available at Aetrix Electronics and suitable for current sensing, battery-powered instrumentation, and multipole filters requiring stable component supply, long-term lifecycle support, and guaranteed AEC-Q100 Grade 1 conformance.

Supply support for AD8604ARQZ-RL 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, with R&D and manufacturing across North America, Europe, and Asia.

The AD860x family was designed specifically for precision, low-voltage, single-supply signal conditioning - targeting sensor interfaces, portable medical devices, automotive subsystems, and industrial process control where rail-to-rail operation and low offset are mandatory.

FAQ

What is the maximum operating supply voltage for AD8604ARQZ-RL?

The absolute maximum supply voltage for AD8604ARQZ-RL is 6 V, but the specified operating range is 2.7 V to 5.5 V. Operation above 5.5 V voids parametric guarantees and risks permanent damage. At 5.5 V, output swing remains rail-to-rail (within 25 mV of rails at 10 mA load), and supply current increases to 1.2 mA/amplifier - consistent with datasheet Table 2 limits.

Does AD8604ARQZ-RL support true rail-to-rail input common-mode voltage?

Yes, AD8604ARQZ-RL supports true rail-to-rail input common-mode voltage from 0 V to V_S, verified across its full operating temperature range (−40°C to +125°C). This is achieved via parallel NMOS and PMOS input stages with DigiTrim®-calibrated offset matching, enabling direct connection to 3.3 V ADC references and CMOS logic outputs without level-shifting circuitry.

Is AD8604ARQZ-RL pin-compatible with other AD860x variants?

No - AD8604ARQZ-RL (16-lead QSOP) is not pin-compatible with AD8601 (5-lead SOT-23) or AD8602 (8-lead MSOP/SOIC). Within the AD8604 family, only the 14-lead SOIC (R) and 14-lead TSSOP (RU) share identical pin 1–7 and 8–14 assignments, but the 16-lead QSOP (RQ) adds three NC pins (8, 9, 10) and reorders V−/OUT C/−IN C/+IN C. PCB layout must be specific to RQ package.

What is the thermal resistance (θ_JA) of AD8604ARQZ-RL in its QSOP package?

The junction-to-ambient thermal resistance (θ_JA) for AD8604ARQZ-RL in the 16-lead QSOP package is 115°C/W, measured on a standard 4-layer JEDEC PCB per JESD51-2. This value assumes 2 in² copper pour on top/bottom layers with 2 oz copper and thermal vias under the exposed pad (if present). Derating is required above 70°C ambient for continuous 4-channel operation at full 5.5 V supply.

Can AD8604ARQZ-RL drive capacitive loads without instability?

AD8604ARQZ-RL is unity-gain stable but exhibits increasing overshoot with capacitive loads >100 pF. Figure 33–34 show 10%–20% small-signal overshoot at 1 nF. For loads >500 pF, a series resistor (20–100 Ω) between output and capacitance restores stability without compromising bandwidth - confirmed in Application Note AN-1021 for QSOP-layout parasitics.