Analog Devices Inc. AD8624ARUZ-RL

Overview

AD8624ARUZ-RL from Analog Devices is a quad precision rail-to-rail output operational amplifier optimized for low-power, high-accuracy signal conditioning. It delivers 125 μV max offset voltage, 215 μA/amp typical supply current, and 11 nV/√Hz voltage noise density across −40°C to +125°C, enabling use in portable medical instrumentation and laser diode control loops.

For engineers reviewing the AD8624ARUZ-RL datasheet, AD8624ARUZ-RL pinout, AD8624ARUZ-RL application, or AD8624ARUZ-RL equivalent, this page provides verified technical context, package-specific pin definitions, real-world application mappings, and validated alternative options for precision analog design.

Technical Context

The AD8624ARUZ-RL integrates input bias current cancellation circuitry to maintain ≤200 pA max IB over full temperature range, supporting high-impedance sensor interfaces. Its unity-gain stable architecture achieves 560 kHz gain bandwidth and 75° phase margin with 10 kΩ load and 20 pF capacitance.

Operating from ±2.5 V to ±15 V, it sustains rail-to-rail output swing (e.g., ±2.41 V at ±2.5 V supply, ±14.75 V at ±15 V) while maintaining 120 dB min CMRR and 135 dB open-loop gain-critical for thermocouple and strain gage amplifiers requiring dc precision and low drift.

Key Specifications

Pinout & Package

AD8624ARUZ-RL is housed in a 14-lead TSSOP (RU-14) package with exposed pad connected to V– for thermal performance. Pin 1 is marked by a dot; exposed pad must be soldered to ground plane per datasheet recommendation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADA4692-4ARUZ and OP4177ARUZ, AD8624ARUZ-RL uniquely balances sub-250 μA quiescent current, <130 μV offset, and <1.2 μV/°C drift-making it optimal for portable industrial sensors needing both battery longevity and field calibration stability.

Availability

AD8624ARUZ-RL is available at Aetrix Electronics and suitable for portable instrumentation, laser diode control, strain gage amplification, and medical device designs requiring stable component supply across extended temperature ranges.

Supply support for AD8624ARUZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets.

The AD8624 belongs to Analog Devices' precision micropower op amp product line, engineered specifically for battery-operated test equipment and sensor signal chains where low offset, low drift, and rail-to-rail output are mandatory.

FAQ

What is the maximum supply voltage rating for AD8624ARUZ-RL?

The AD8624ARUZ-RL has an absolute maximum supply voltage rating of ±18 V. Operation beyond this limit risks permanent damage. For reliable long-term performance, Analog Devices specifies operation from ±2.5 V to ±15 V, with tested performance data provided for both ±2.5 V and ±15 V conditions in the datasheet. The AD8624ARUZ-RL maintains rail-to-rail output swing and specified offset voltage within this recommended range.

Does AD8624ARUZ-RL support true rail-to-rail input operation?

No, AD8624ARUZ-RL does not support rail-to-rail input operation. Its input voltage range is specified as −1.3 V to +1.3 V with ±2.5 V supplies and −13.8 V to +13.8 V with ±15 V supplies-leaving a 1.2 V margin from each rail. However, it does provide rail-to-rail output swing, delivering output voltages within 50 mV of the positive and negative supply rails under typical load conditions. This makes AD8624ARUZ-RL ideal for output buffering but requires input signal conditioning if signals approach supply rails.

How is the exposed pad on the AD8624ARUZ-RL TSSOP package intended to be used?

The exposed pad on the AD8624ARUZ-RL's 14-lead TSSOP package is electrically connected to V– and must be soldered to a PCB ground plane or V– copper pour to ensure proper thermal dissipation and electrical stability. Per Analog Devices' datasheet, this connection reduces thermal resistance (θJA) from 112°C/W to near theoretical limits and prevents potential oscillation due to parasitic inductance. Leaving the pad unconnected degrades thermal performance and may compromise long-term reliability in high-temperature applications.

Can AD8624ARUZ-RL drive capacitive loads without instability?

AD8624ARUZ-RL is unity-gain stable but exhibits increasing overshoot with capacitive loads above 100 pF. Figure 30 shows small-signal overshoot rising to ~45% at 10 nF with ±2.5 V supplies. For loads >100 pF, a series resistor (typically 10–100 Ω) placed between the output and capacitive load restores stability without significantly affecting bandwidth. This isolation technique is documented in the "Applications Information" section and validated in transient response plots (Figures 31, 34, 38) for CL = 100 pF. The AD8624ARUZ-RL remains stable under all tested conditions when this guideline is followed.

What is the guaranteed maximum input bias current for AD8624ARUZ-RL over temperature?

The AD8624ARUZ-RL guarantees a maximum input bias current of 400 pA over the full operating temperature range of −40°C to +125°C, as specified in Table 2 (±2.5 V operation) and Table 3 (±15 V operation). At 25°C, typical IB is 30 pA (±2.5 V) or 45 pA (±15 V), with worst-case values remaining ≤200 pA. This performance is enabled by internal bias current cancellation circuitry, making AD8624ARUZ-RL suitable for interfacing with high-impedance sources like pH electrodes and piezoelectric sensors across extreme environmental conditions.