Analog Devices Inc. AD8691WAUJZ-RL

Overview

AD8691WAUJZ-RL from Analog Devices is a single-channel, rail-to-rail output, CMOS operational amplifier qualified for automotive applications. It delivers 10 MHz gain bandwidth, 8 nV/√Hz voltage noise density, and 400 µV typical offset voltage at 2.7 V to 6 V supply, enabling precision signal conditioning in photodiode amplifiers and battery-powered medical sensors.

For engineers reviewing the AD8691WAUJZ-RL datasheet, AD8691WAUJZ-RL pinout, AD8691WAUJZ-RL application, or AD8691WAUJZ-RL equivalent, key selection criteria include its −40°C to +125°C automotive temperature rating, 1 pA max input bias current, rail-to-rail output swing within 25 mV of rails (IL = 1 mA), and SC70/TSOT package compatibility with space-constrained sensor front-ends.

Technical Context

The AD8691WAUJZ-RL employs a CMOS input stage delivering ultra-low input bias current (≤1 pA) and low input capacitance (2.5 pF differential), making it suitable for high-impedance source interfacing. Its unity-gain stable architecture supports wideband closed-loop configurations up to 10 MHz without external compensation.

It features rail-to-rail output swing (25 mV from rail at 1 mA load), low distortion (0.0006% THD+N at 1 kHz), and robust PSRR (≥80 dB) across 2.7 V–5.5 V supply range-critical for noisy automotive power domains and portable instrumentation where supply rejection directly impacts measurement fidelity.

Key Specifications

Pinout & Package

AD8691WAUJZ-RL is housed in a 5-lead TSOT (UJ-5) package per JEDEC MO-193-AB, with 0.65 mm lead pitch and 1.00 mm max height. The package supports reflow soldering and provides thermal resistance θ_JA = 207°C/W on standard PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8691AUJZ-RL and MCP6001T-E/OT, AD8691WAUJZ-RL uniquely combines automotive qualification, 10 MHz bandwidth, and sub-1 pA input bias-making it irreplaceable in safety-relevant photodiode-based position sensing and high-fidelity medical analog front-ends.

Availability

AD8691WAUJZ-RL is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical diagnostics, and industrial condition monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD8691WAUJZ-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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.

The AD869x family was designed specifically for automotive and industrial signal chains demanding low noise, rail-to-rail operation, and guaranteed performance across −40°C to +125°C-targeting photodiode, sensor, and portable instrumentation applications.

FAQ

What is the maximum supply voltage for AD8691WAUJZ-RL?

The absolute maximum supply voltage for AD8691WAUJZ-RL is 6 V, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable long-term use, Analog Devices recommends staying within the recommended operating range of 2.7 V to 6 V, with derating applied at elevated temperatures per the thermal characteristics section of the AD8691WAUJZ-RL datasheet.

Does AD8691WAUJZ-RL support rail-to-rail input?

No, AD8691WAUJZ-RL features rail-to-rail *output* only. Its input common-mode voltage range extends from −0.3 V to (V+) − 1.1 V at 2.7 V supply, or −0.3 V to (V+) − 1.1 V at 5 V supply-meaning it does not accept signals all the way to the positive rail. This limitation must be considered in single-supply non-inverting amplifier designs where input biasing is required to stay within the valid common-mode window.

Is AD8691WAUJZ-RL pin-compatible with other AD869x variants?

Yes, AD8691WAUJZ-RL shares identical 5-lead TSOT (UJ-5) pinout with AD8691AUJZ-RL and AD8691AKSZ-R2 (SC70), but the SC70 variant has different mechanical dimensions and thermal characteristics. Electrical pin functions are consistent across all AD8691 variants, enabling direct PCB footprint reuse between commercial and automotive grades when using the TSOT package.

What is the typical input offset voltage drift of AD8691WAUJZ-RL?

The typical input offset voltage drift for AD8691WAUJZ-RL is 2 µV/°C, with a maximum of 12 µV/°C over the full −40°C to +125°C automotive temperature range. This drift specification is confirmed in Table 1 of the AD8691WAUJZ-RL datasheet under "Offset Voltage Drift ∆VOS/∆T" for the AD8691 grade, and is independent of the W-grade qualification.

Can AD8691WAUJZ-RL drive capacitive loads without oscillation?

AD8691WAUJZ-RL remains stable with capacitive loads up to 15 pF when configured as a unity-gain buffer, as verified in Figure 14 (open-loop gain/phase) and Figure 18 (overshoot vs. load capacitance). For loads exceeding 15 pF, an isolation resistor (typically 20–100 Ω) must be placed in series with the output to maintain phase margin above 60° and prevent peaking or ringing in transient response.