Analog Devices Inc. AD8627AKSZ-R2

Overview

AD8627AKSZ-R2 from Analog Devices is a precision single-channel JFET-input operational amplifier in a 5-lead SC70 package, featuring rail-to-rail output, 1 pA max input bias current, 5 MHz gain bandwidth, and 500 µV max offset voltage at 25°C. It operates from single supplies (5 V to 26 V) or dual supplies (±2.5 V to ±13 V), enabling use in photodiode transimpedance amplifiers and battery-powered instrumentation.

For engineers reviewing the AD8627AKSZ-R2 datasheet, AD8627AKSZ-R2 pinout, AD8627AKSZ-R2 application, or AD8627AKSZ-R2 equivalent, key selection criteria include ultra-low input bias current for high-impedance sensor interfaces, rail-to-rail output swing under light load, and guaranteed performance across −40°C to +85°C industrial temperature range.

Technical Context

The AD8627AKSZ-R2 employs an n-channel JFET input stage delivering true single-supply operation with input common-mode range extending 0.2 V below V− and up to 2 V below V+, and a unique bipolar rail-to-rail output stage that achieves ≤5 mV dropout at 2 mA load. Its unity-gain stable architecture supports capacitive loads >500 pF without oscillation.

It exhibits low 17.5 nV/√Hz voltage noise density at 1 kHz and 0.4 fA/√Hz current noise density-critical for low-noise, high-source-impedance applications like photodiode preamplification-and maintains 60° phase margin across supply voltages and temperatures.

Key Specifications

Pinout & Package

AD8627AKSZ-R2 is housed in a 5-lead SC70 (KS suffix) surface-mount package, optimized for space-constrained PCB layouts and tape-and-reel automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA140AIDBVR and ADA4625-1ACPZ-R7, AD8627AKSZ-R2 delivers the best balance of ultra-low input bias current, industrial temperature stability, and sub-1 mA quiescent power - making it uniquely suited for long-life, high-impedance, battery- or loop-powered sensing systems where thermal drift and standby current dominate design constraints.

Availability

AD8627AKSZ-R2 is available at Aetrix Electronics and suitable for photodiode amplification, line-powered instrumentation, and battery-powered sensor signal conditioning requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD8627AKSZ-R2 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 design centers and manufacturing facilities worldwide.

The AD862x family-including AD8627AKSZ-R2-is engineered for precision, low-power, single-supply JFET op amp applications including photodiode preamplification, ATE reference drivers, and remote sensor signal conditioning across industrial and automotive environments.

FAQ

What is the maximum input bias current specification for AD8627AKSZ-R2 over temperature?

The AD8627AKSZ-R2 has a maximum input bias current of 1 pA at 25°C, rising to 60 pA over the full −40°C to +85°C industrial temperature range. This picoamp-level performance is critical for maintaining accuracy in high-impedance photodiode and piezoelectric sensor interfaces where leakage currents dominate error budgets.

Does AD8627AKSZ-R2 support true rail-to-rail input operation?

AD8627AKSZ-R2 does not provide rail-to-rail input common-mode range. Its input voltage range extends from 0.2 V below V− to 2 V below V+, meaning it accepts signals down to V− − 0.2 V but cannot reliably handle inputs within 2 V of V+. This limitation is explicitly documented in the Applications Information section to prevent bandwidth loss and increased offset error.

Can AD8627AKSZ-R2 drive capacitive loads without instability?

Yes, AD8627AKSZ-R2 is specified to remain stable with capacitive loads exceeding 500 pF, a key advantage over many general-purpose op amps. This capability eliminates the need for series isolation resistors when interfacing with ADC input capacitors, long cables, or piezoelectric transducers - preserving signal integrity and simplifying PCB layout.

What is the recommended minimum load resistance for AD8627AKSZ-R2 to maintain low input bias current?

To minimize junction temperature rise-and thus prevent doubling of input bias current every 10°C-the AD8627AKSZ-R2 datasheet recommends maintaining a minimum load resistance of 1 kΩ. Lower loads increase power dissipation, raising die temperature and degrading the 1 pA input bias current specification, especially in enclosed or high-ambient-temperature environments.

Is AD8627AKSZ-R2 pin-compatible with other members of the AD862x family?

No, AD8627AKSZ-R2 (5-lead SC70) is not pin-compatible with AD8626 (8-lead SOIC/MSOP) or AD8625 (14-lead SOIC/TSSOP). Each variant uses distinct pinouts and package footprints. The SC70 package of AD8627AKSZ-R2 integrates only one amplifier with dedicated NC, −IN, V+, +IN, and OUT pins-requiring unique PCB layout and schematic symbol.