Analog Devices Inc. AD8625AR-REEL7

Overview

AD8625AR-REEL7 from Analog Devices is a precision quad JFET-input operational amplifier optimized for low-power, single-supply operation (5 V to 26 V) with rail-to-rail output swing, 5 MHz gain bandwidth, and 1 pA max input bias current. It delivers 500 µV max offset voltage, 630 µA/amp supply current, and operates across −40°C to +85°C - ideal for photodiode transimpedance amplification and battery-powered instrumentation.

For engineers reviewing the AD8625AR-REEL7 datasheet, AD8625AR-REEL7 pinout, AD8625AR-REEL7 application, or AD8625AR-REEL7 equivalent, key selection criteria include guaranteed picoampere input bias current over temperature, rail-to-rail output capability at ±2 mA load, unity-gain stability with >500 pF capacitive drive, and full industrial temperature specification without derating.

Technical Context

The AD8625AR-REEL7 implements a true JFET-input stage with n-channel devices enabling ultra-low input bias current (≤1 pA at 25°C, ≤60 pA over −40°C to +85°C) and wide common-mode input range (0 V to 3 V on 5 V supply). Its bipolar rail-to-rail output stage achieves <5 mV saturation voltage at ±2 mA load while maintaining phase margin ≥60° and no phase reversal under rail-stressing conditions.

It supports both single-supply (5 V to 26 V) and dual-supply (±2.5 V to ±13 V) operation, with CMRR ≥87 dB and PSRR ≥104 dB at 25°C. The device is unity-gain stable and specified for capacitive loads up to 500 pF, enabling direct interface with ADC drivers, DAC buffers, and precision filter stages without external compensation.

Key Specifications

Pinout & Package

AD8625AR-REEL7 is housed in a 14-lead SOIC (R package) with standard quad op amp pinout and exposed pad not connected internally. Pin assignments are validated per Figure 1 (14-Lead SOIC) in Rev. F datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8626ARMZ-REEL, AD8625AR-REEL7 provides two additional amplifiers in the same footprint-class SOIC package, reducing component count in multi-channel systems; compared with OPA211IDGKT, it delivers 3.6× lower input bias current critical for high-Z sensor interfaces, despite higher voltage noise.

Availability

AD8625AR-REEL7 is available at Aetrix Electronics and suitable for photodiode amplification, battery-powered instrumentation, and automotive sensor signal conditioning requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for AD8625AR-REEL7 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 test equipment - emphasizing picoampere input bias, rail-to-rail operation, and industrial temperature reliability.

FAQ

What is the maximum capacitive load the AD8625AR-REEL7 can drive while remaining stable?

The AD8625AR-REEL7 is unity-gain stable and characterized to drive ≥500 pF capacitive loads without oscillation or excessive overshoot, as verified in Figure 31 and Figure 32 of the Rev. F datasheet. For loads exceeding 500 pF, external isolation resistance (e.g., 10 Ω–100 Ω in series with the output) is recommended to maintain phase margin ≥60° and prevent peaking.

Does the AD8625AR-REEL7 support true rail-to-rail input operation?

The AD8625AR-REEL7 supports rail-to-rail *output* swing but has a limited rail-to-rail *input* common-mode range: on a 5 V supply, inputs operate from 0 V to 3 V (i.e., 2 V below V+), as specified in Table 1. Driving the input within 2 V of V+ increases common-mode error and reduces bandwidth, per Figure 15 and Applications Information section.

Can the AD8625AR-REEL7 be used with a 3.3 V single supply?

AD8625AR-REEL7 is not characterized or guaranteed for 3.3 V operation. Its absolute minimum single-supply voltage is 5 V per Absolute Maximum Ratings (Table 3) and Electrical Characteristics (Tables 1–2). Operation below 5 V risks degraded PSRR, reduced output swing, and undefined input bias current behavior.

How does the AD8625AR-REEL7 handle input overvoltage conditions?

The AD8625AR-REEL7 tolerates input voltages up to 15 V below V− if the total voltage between V+ and the input remains <26 V. However, inputs exceeding V+ by >300 mV for >10 seconds may cause permanent damage. A 10 kΩ series resistor on the non-inverting input is recommended for overvoltage protection, adding negligible noise per Applications Information section.

Is the AD8625AR-REEL7 pin-compatible with other AD862x variants like AD8626 or AD8627?

No - AD8625AR-REEL7 (14-lead SOIC quad) is not pin-compatible with AD8626 (dual, 8-lead SOIC/MSOP) or AD8627 (single, 5-lead SC70/8-lead SOIC). Each variant has distinct pin counts, layouts, and channel counts; PCB layout must be specific to AD8625AR-REEL7's 14-pin SOIC footprint and quad pinout shown in Figure 1.