Analog Devices Inc. ADA4001-2ARZ-RL

Overview

ADA4001-2ARZ-RL from Analog Devices is a dual-channel JFET-input operational amplifier optimized for high-impedance sensor signal conditioning, featuring 7.7 nV/√Hz voltage noise density at 1 kHz, 20 pA typical input bias current at ±15 V supply, and rail-to-rail output swing delivering ±14.8 V into 10 kΩ. It operates across −40°C to +125°C and supports precision photodiode amplification in medical instruments and automated test equipment.

For engineers reviewing the ADA4001-2ARZ-RL datasheet, ADA4001-2ARZ-RL pinout, ADA4001-2ARZ-RL application, or ADA4001-2ARZ-RL equivalent, key selection criteria include its low 1.2 µV rms integrated noise (20 Hz–20 kHz), 10.2 MHz unity-gain crossover, 1.2 µs settling time to 0.01%, absence of phase reversal, and guaranteed performance under capacitive loads up to 100 pF.

Technical Context

The ADA4001-2ARZ-RL employs a JFET input stage enabling >1 × 10¹³ Ω input resistance and sub-3 fA/√Hz current noise density at 1 kHz. Its internal compensation ensures unity-gain stability while maintaining 76° phase margin with 2 kΩ load.

It delivers rail-to-rail output swing (±14.8 V into 10 kΩ) without phase reversal even when inputs exceed common-mode limits, and sustains 10.3 MHz −3 dB bandwidth at G = +1 with 100 pF capacitive load - a critical capability for filter and transimpedance stages.

Key Specifications

Pinout & Package

ADA4001-2ARZ-RL is housed in an 8-lead narrow SOIC package (JEDEC MS-012-AA, R-8 suffix), with 1.27 mm lead pitch and 5.00 mm × 4.00 mm body dimensions. Thermal resistance is θ_JA = 130°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2134PA and LT1792CS8#PBF, the ADA4001-2ARZ-RL uniquely combines rail-to-rail output, −40°C to +125°C operation, and balanced low-noise/low-IB performance - making it the only option that satisfies all three requirements simultaneously in harsh-environment sensor signal chains.

Availability

ADA4001-2ARZ-RL is available at Aetrix Electronics and suitable for medical instrumentation, photodiode amplification, and precision current measurement requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADA4001-2ARZ-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADA4001-2ARZ-RL belongs to Analog Devices' precision JFET op-amp product line, engineered specifically for high-impedance, low-noise signal conditioning in demanding industrial, medical, and test equipment applications.

FAQ

What is the maximum capacitive load the ADA4001-2ARZ-RL can drive without instability?

The ADA4001-2ARZ-RL maintains 76° phase margin and stable operation with up to 100 pF capacitive load at unity gain, as verified in Figure 19 of the Rev. C datasheet. This capability eliminates the need for series isolation resistors when driving ADC inputs or long PCB traces, simplifying layout and preserving bandwidth in transimpedance and filter applications.

Does the ADA4001-2ARZ-RL exhibit phase reversal under overvoltage conditions at the inputs?

No - the ADA4001-2ARZ-RL is explicitly designed to avoid phase reversal. Figure 23 in the datasheet confirms stable, monotonic output behavior even when input voltages exceed the ±12.5 V common-mode range. This eliminates risk of latch-up or erroneous control signals in sensor front-ends exposed to transient overvoltages.

What is the integrated voltage noise of the ADA4001-2ARZ-RL over the audio band?

The ADA4001-2ARZ-RL delivers 1.2 µV rms integrated voltage noise from 20 Hz to 20 kHz, as specified in Table 1 of the Rev. C datasheet. This value is measured under standard ±15 V supply conditions and directly determines minimum detectable signal level in audio preamplifiers and biopotential amplifiers.

Is the ADA4001-2ARZ-RL RoHS compliant and lead-free?

Yes - the "Z" suffix in ADA4001-2ARZ-RL indicates RoHS compliance and lead-free packaging, per the Ordering Guide on page 12 of the Rev. C datasheet. The device meets JEDEC MS-012-AA mechanical specifications and is qualified for reflow soldering per IPC/JEDEC J-STD-020.

How does the input bias current of the ADA4001-2ARZ-RL vary with temperature?

The ADA4001-2ARZ-RL exhibits typical input bias current of 20 pA at 25°C, rising to 4 nA maximum at +125°C (Table 1). This doubling every ~10°C follows JFET junction leakage physics and is fully characterized - enabling accurate error budgeting in high-temperature sensor interfaces using the datasheet's Figure 6 curves.