Analog Devices Inc. AD8626ARZ

Overview

AD8626ARZ from Analog Devices is a dual-channel, precision JFET-input operational amplifier optimized for low-power, single-supply operation (5 V to 26 V) and rail-to-rail output swing. It delivers 5 MHz gain bandwidth, 5 V/µs slew rate, <1 pA input bias current, 500 µV max offset voltage, and 17.5 nV/√Hz voltage noise density - enabling high-accuracy signal conditioning in photodiode preamps, DAC output buffers, and precision filters.

For engineers reviewing the AD8626ARZ datasheet, AD8626ARZ pinout, AD8626ARZ application, or AD8626ARZ equivalent, this page provides verified technical context, package-specific pin definitions, real-world application mappings, and validated alternative options for industrial instrumentation, battery-powered sensors, and automotive signal chains.

Technical Context

The AD8626ARZ employs an n-channel JFET input stage to achieve true single-supply operation with input common-mode range extending 0.2 V below V– and up to 2 V below V+, plus rail-to-rail output swing within 5 mV of rails at ±2 mA load. Its unity-gain-stable architecture supports capacitive loads >500 pF without phase reversal - confirmed across −40°C to +85°C.

It features a bipolar rail-to-rail output stage, low 630 µA/amp quiescent current, and high CMRR (87 dB typ @ 5 V), PSRR (104 dB typ), and channel separation (104 dB @ 1 kHz), making it suitable for multi-channel precision analog front-ends where crosstalk and supply sensitivity must be minimized.

Key Specifications

Pinout & Package

AD8626ARZ is supplied in an 8-lead SOIC (R-8) package with standard pinout and no internal NC pins. Thermal resistance θ_JA = 158°C/W supports reliable operation in industrial ambient conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2134PA and ADA4625-2ARZ, AD8626ARZ uniquely balances ultra-low input current (≤1 pA), low power (630 µA/amp), rail-to-rail operation, and industrial temperature support - making it the optimal choice for cost-sensitive, battery-operated, or multi-channel precision analog systems where leakage and supply efficiency are critical.

Availability

AD8626ARZ is available at Aetrix Electronics and suitable for photodiode amplifiers, DAC output buffering, and precision low-frequency filtering requiring stable component supply across industrial, automotive, and test equipment lifecycles.

Supply support for AD8626ARZ 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 AD862x family was designed specifically for precision, low-power, single-supply signal conditioning in instrumentation, sensor interfaces, and portable measurement systems - emphasizing picoamp input bias, rail-to-rail swing, and robustness across −40°C to +85°C.

FAQ

What is the maximum capacitive load the AD8626ARZ can drive without instability?

The AD8626ARZ is specified to remain stable with capacitive loads exceeding 500 pF, as confirmed in the datasheet's typical performance characteristics and applications information. This capability allows direct interface to ADC input capacitors, long cables, or multi-stage active filters without external isolation resistors or compensation networks - provided layout practices minimize parasitic inductance at the output node. The AD8626ARZ achieves this via internal frequency compensation optimized for unity-gain stability.

Does the AD8626ARZ support true rail-to-rail input operation?

Yes, the AD8626ARZ supports rail-to-rail input operation with a common-mode voltage range extending from 0.2 V below V– to 2 V below V+. In a 5 V single-supply configuration, this means the input accepts signals from −0.2 V to +3.0 V. Operation within 2 V of V+ increases common-mode error and reduces bandwidth, as documented in Figure 15 and Applications Information section - so design margins should keep inputs ≥2 V below V+ for full-spec performance.

Can the AD8626ARZ be used in dual-supply configurations?

Yes, the AD8626ARZ is fully specified for dual-supply operation from ±2.5 V to ±13 V. Electrical characteristics tables include dedicated rows for ±13 V conditions, confirming parameters such as ±12.92 V output swing, ±15 mA output current, and 105 dB CMRR. Its JFET input stage ensures symmetrical performance and low input current across both polarities - making it suitable for bipolar sensor signal conditioning and legacy industrial systems with split supplies.

What is the thermal performance of the AD8626ARZ in SOIC package?

The AD8626ARZ in 8-lead SOIC (R-8) package has a junction-to-ambient thermal resistance (θ_JA) of 158°C/W, as listed in Table 4 of the datasheet. At maximum rated supply (26 V) and worst-case output loading, power dissipation remains below 150 mW - resulting in <24°C junction-to-ambient rise above ambient. This enables reliable operation in sealed enclosures up to +85°C ambient without forced airflow or heatsinking.

How does the AD8626ARZ handle input overvoltage conditions?

The AD8626ARZ tolerates input voltages up to 15 V below V– if the total voltage between V+ and the input terminal stays ≤26 V. However, inputs exceeding V+ by >300 mV for >10 seconds risk permanent damage. To protect against transient overvoltage, a 10 kΩ series resistor on the noninverting input limits current while adding negligible noise - a method validated in the Applications Information section and Figure 46 implementation notes.