Analog Devices Inc. AD8627ARZ

Overview

AD8627ARZ from Analog Devices is a precision single-channel JFET-input operational amplifier optimized for low-power, rail-to-rail output operation across 5 V to 26 V single-supply or ±2.5 V to ±13 V dual-supply systems. It delivers 5 MHz gain bandwidth, 5 V/µs slew rate, <1 pA input bias current (max), 500 µV max offset voltage, and rail-to-rail output swing within 5 mV of rails at 2 mA load - enabling high-accuracy signal conditioning in photodiode preamps, DAC output buffers, and precision filters.

For engineers reviewing the AD8627ARZ datasheet, AD8627ARZ pinout, AD8627ARZ application, or AD8627ARZ equivalent, key selection criteria include its picoamp-level input bias current, industrial temperature range (−40°C to +85°C), SC70-5 and SOIC-8 package options, unity-gain stability, and absence of phase reversal - all critical for low-leakage sensor interfaces and battery-powered instrumentation.

Technical Context

The AD8627ARZ employs an n-channel JFET input stage delivering ultra-low input bias current (≤1 pA at 25°C) and wide input common-mode range (0.2 V below V– to 2 V below V+). Its bipolar rail-to-rail output stage maintains <5 mV saturation voltage at ±2 mA, supporting full dynamic range in single-supply systems without external level-shifting.

It achieves 60° phase margin with 5 MHz GBP and remains stable driving ≥500 pF capacitive loads - eliminating need for isolation resistors in photodiode transimpedance configurations. The device avoids phase reversal even when inputs exceed V+, a key reliability feature absent in many legacy JFET op amps.

Key Specifications

Pinout & Package

AD8627ARZ is available in 8-lead SOIC (R-8 suffix) package, RoHS-compliant, with standard JEDEC outline MS-012AA. Pin 1 is marked by notch or dot; pin count and orientation conform to industry-standard SOIC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA140AIDBVR and ADA4625-1ARZ, AD8627ARZ offers optimal balance of ultra-low input bias current, sub-1 mA quiescent power, and guaranteed −40°C to +85°C performance - making it the preferred choice for cost-sensitive, low-leakage, battery- or line-powered instrumentation where 5 MHz bandwidth suffices.

Availability

AD8627ARZ is available at Aetrix Electronics and suitable for photodiode preamplifiers, DAC output buffers, and precision low-pass filters requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and automotive programs.

Supply support for AD8627ARZ 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 sensor interfaces, portable instrumentation, and industrial control systems - emphasizing picoamp input bias, rail-to-rail output, and robustness against phase reversal.

FAQ

What is the maximum input bias current specification for AD8627ARZ at 25°C?

The AD8627ARZ has a maximum input bias current of 1 pA at 25°C and ±13 V supply, as specified in Table 1 of the Rev. F datasheet. This value increases with temperature - doubling approximately every 10°C - so thermal management is critical to maintain pA-level performance in high-temperature deployments of AD8627ARZ.

Does AD8627ARZ support true rail-to-rail input operation?

AD8627ARZ does not support rail-to-rail input; its input common-mode range extends from 0.2 V below V− to 2 V below V+. However, it does provide rail-to-rail output swing - within 5 mV of both rails at ±2 mA - which is essential for maximizing dynamic range in single-supply systems using AD8627ARZ as a buffer or gain stage.

Can AD8627ARZ drive capacitive loads without oscillation?

Yes, AD8627ARZ is stable driving capacitive loads up to at least 500 pF, as confirmed in the General Description and Typical Performance Characteristics (Figure 31–32). This capability allows direct interface to ADC input capacitors or long PCB traces without series isolation resistors - a key advantage in compact sensor modules using AD8627ARZ.

What is the recommended minimum load resistance for AD8627ARZ to maintain output accuracy?

Analog Devices recommends maintaining a minimum load resistance of 1 kΩ for AD8627ARZ to limit self-heating and prevent degradation of input bias current and offset voltage specifications. At loads <1 kΩ, junction temperature rise increases, causing IB to double per 10°C - directly impacting DC accuracy in precision applications using AD8627ARZ.

Is AD8627ARZ pin-compatible with other members of the AD862x family?

No - AD8627ARZ (single-channel) is not pin-compatible with AD8626 (dual-channel) or AD8625 (quad-channel) in SOIC packages. While all share identical pin 1–5 assignments (V+, −IN, +IN, V−, OUT), AD8627ARZ has pins 6–8 marked NC, whereas AD8626 uses those pins for second channel I/O. Interchanging them without schematic and layout review will cause functional failure in circuits relying on AD8627ARZ.