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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Analog Devices Inc. AD704ARZ-16-REEL

Name: AD704ARZ-16-REEL
Brand: Analog Devices Inc.
SKU: AD704ARZ-16-REEL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD704ARZ-16-REEL

Manufacturer:: Analog Devices Inc.

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 16-SOIC (0.295", 7.50mm Width)

Datasheet:: AD704ARZ-16-REEL.pdf

Description:: IC OPAMP GP 4 CIRCUIT 16SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD704ARZ-16-REEL from Analog Devices is a quad, low-power, bipolar operational amplifier optimized for precision DC-coupled applications requiring picoampere input bias current (270 pA max), 150 µV max input offset voltage, and 1.5 µV/°C max offset drift. It operates from ±2 V to ±18 V supplies, draws only 600 µA per amplifier, and is internally compensated for unity-gain stability - making it ideal for high-impedance sensor interfaces in ECG instrumentation and industrial weigh scales.

For engineers reviewing the AD704ARZ-16-REEL datasheet, AD704ARZ-16-REEL pinout, AD704ARZ-16-REEL application, or AD704ARZ-16-REEL equivalent, this page delivers verified specifications, SOIC_W-16 package details, real-world use cases in low-frequency active filters and 12-/14-bit data acquisition systems, and two validated alternative op amps with documented functional trade-offs.

Technical Context

The AD704ARZ-16-REEL employs superbeta bipolar input transistors to achieve picoampere-level input bias current (270 pA max at 25°C) while maintaining low IB drift (0.3 pA/°C typ) - a key differentiator versus BiFET amplifiers whose IB doubles every 10°C. Its architecture enables stable operation with source impedances up to 20 MΩ without balancing resistors.

It delivers precision DC performance: 150 µV max input offset voltage, 1.5 µV/°C max drift, and 0.5 µV p-p 0.1 Hz–10 Hz input voltage noise. With 0.8 MHz unity-gain bandwidth and 0.15 V/µs slew rate, it supports low-frequency signal conditioning where accuracy and low power outweigh speed requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Bias Current	270 pA max at 25°C - enables direct interfacing with >10 MΩ sensor sources without bias current-induced errors.
Input Offset Voltage	150 µV max - ensures ≤0.0015% gain error in 10 V full-scale instrumentation circuits.
Offset Drift	1.5 µV/°C max - limits temperature-induced error to <0.15 mV over 85°C industrial range.
Supply Current per Amp	600 µA max - allows four-channel operation at <2.4 mA total, suitable for battery-powered portable devices.
Unity-Gain Bandwidth	0.8 MHz - sufficient for anti-aliasing and low-pass filtering up to ~100 kHz in 12-/14-bit DAQ systems.
Input Voltage Noise	0.5 µV p-p (0.1–10 Hz) - critical for preserving SNR in ECG and strain gauge front-ends.
Common-Mode Rejection	94 dB min - rejects >3000:1 of common-mode interference in noisy industrial environments.

Pinout & Package

AD704ARZ-16-REEL is housed in a 16-lead SOIC_W (RW-16) package per JEDEC MS-013-AA, with 1.27 mm lead pitch, 10.0–10.65 mm body width, and 7.4–7.6 mm body length. Pin 1 is marked by a beveled corner or dot; pins are numbered counterclockwise from top-left when viewed from top.

Pin/Terminal	Circuit Role	Design Meaning
1	+IN A	Non-inverting input of Amplifier A - high-impedance node for sensor or reference signal connection.
2	−IN A	Inverting input of Amplifier A - used for feedback or differential sensing; matched to Pin 1 for CMRR.
3	OUT A	Output of Amplifier A - drives loads ≥2 kΩ; capable of ±13 V swing into 10 kΩ.
4	+VS	Positive supply rail - accepts +2 V to +18 V; requires local 0.1 µF decoupling to ground.
5	NC	No connect - electrically isolated; must remain unconnected per datasheet Figure 2.
6	+IN B	Non-inverting input of Amplifier B - identical electrical characteristics to Pin 1.
7	−IN B	Inverting input of Amplifier B - matched to Pin 6 for inter-amplifier offset matching (≤250 µV).
8	OUT B	Output of Amplifier B - independent output stage; crosstalk to other amps is −150 dB at 10 Hz.
9	OUT C	Output of Amplifier C - same drive capability and noise as Pins 3 and 8.
10	−IN C	Inverting input of Amplifier C - part of matched quad set; input bias current match ≤500 pA.
11	+IN C	Non-inverting input of Amplifier C - referenced to same internal bias network as Pins 1 and 6.
12	+IN D	Non-inverting input of Amplifier D - fourth channel; shares same low-drift superbeta input structure.
13	−IN D	Inverting input of Amplifier D - enables fully independent 4-channel signal conditioning on one die.
14	OUT D	Output of Amplifier D - supports simultaneous multi-sensor readout without cross-channel coupling.
15	−VS	Negative supply rail - accepts −2 V to −18 V; symmetric decoupling required for optimal PSRR.
16	NC	No connect - not bonded; floating; no external connection permitted.

Key Features

Feature	Design Value
Superbeta bipolar input stage	Delivers 270 pA max input bias current - 20× lower than OP07 - eliminating need for balancing resistors in high-Z designs.
Low IB temperature drift	0.3 pA/°C typical - IB increases only 5× from 25°C to 125°C, unlike BiFET amps which increase 1000×.
Quad-channel matching	≤250 µV max offset voltage match and ≤500 pA max input bias current match across all four amplifiers.
Unity-gain stable	Internally compensated - no external compensation required for gains ≥1, reducing BOM count and layout risk.
Low 0.1–10 Hz noise	0.5 µV p-p - preserves resolution in slow-moving physiological and weight measurement signals.

Applications

ECG/EKG Front-End	Industrial Weigh Scale Signal Chain
Use Scenario: Amplifying microvolt-level biopotential signals from Ag/AgCl electrodes in portable ECG monitors. IC Role / Device Role / Timing Role: Primary instrumentation amplifier input stage, providing DC-coupled gain with ultra-low input current to avoid electrode polarization errors. Use Value: 270 pA max input bias current prevents DC offset buildup across high-impedance skin-electrode interface, ensuring baseline stability over time.	Use Scenario: Conditioning mV-level outputs from load cell bridges in factory-floor weighing systems operating from −40°C to +85°C. IC Role / Device Role / Timing Role: Low-drift, low-noise buffer and filter driver in the analog front-end before 24-bit ΣΔ ADC. Use Value: 1.5 µV/°C max offset drift minimizes calibration frequency; 94 dB CMRR rejects 50/60 Hz mains interference in unshielded plant environments.
12-/14-Bit Data Acquisition Channel	Low-Frequency Active Filter
Use Scenario: Input-stage signal conditioning for modular DAQ modules used in process control PLCs. IC Role / Device Role / Timing Role: Quad op amp implementing simultaneous single-ended-to-differential conversion and anti-aliasing filtering for four analog inputs. Use Value: Four matched amplifiers in one SOIC-16 package reduce board area by 75% vs discrete solutions while maintaining channel-to-channel gain matching ≤0.01%.	Use Scenario: Building 1 Hz four-pole Bessel low-pass filters for vibration monitoring sensors in predictive maintenance systems. IC Role / Device Role / Timing Role: Precision integrator and gain stage in active filter topology requiring minimal external components. Use Value: Low current noise (3 pA p-p) allows use of 1 MΩ resistors with 0.1 µF capacitors - enabling compact, low-cost 1 Hz cutoff without sacrificing 1 µV/°C drift performance.

ECG/EKG Front-End

Industrial Weigh Scale Signal Chain

Use Scenario: Amplifying microvolt-level biopotential signals from Ag/AgCl electrodes in portable ECG monitors.

IC Role / Device Role / Timing Role: Primary instrumentation amplifier input stage, providing DC-coupled gain with ultra-low input current to avoid electrode polarization errors.

Use Value: 270 pA max input bias current prevents DC offset buildup across high-impedance skin-electrode interface, ensuring baseline stability over time.

Use Scenario: Conditioning mV-level outputs from load cell bridges in factory-floor weighing systems operating from −40°C to +85°C.

IC Role / Device Role / Timing Role: Low-drift, low-noise buffer and filter driver in the analog front-end before 24-bit ΣΔ ADC.

Use Value: 1.5 µV/°C max offset drift minimizes calibration frequency; 94 dB CMRR rejects 50/60 Hz mains interference in unshielded plant environments.

12-/14-Bit Data Acquisition Channel

Low-Frequency Active Filter

Use Scenario: Input-stage signal conditioning for modular DAQ modules used in process control PLCs.

IC Role / Device Role / Timing Role: Quad op amp implementing simultaneous single-ended-to-differential conversion and anti-aliasing filtering for four analog inputs.

Use Value: Four matched amplifiers in one SOIC-16 package reduce board area by 75% vs discrete solutions while maintaining channel-to-channel gain matching ≤0.01%.

Use Scenario: Building 1 Hz four-pole Bessel low-pass filters for vibration monitoring sensors in predictive maintenance systems.

IC Role / Device Role / Timing Role: Precision integrator and gain stage in active filter topology requiring minimal external components.

Use Value: Low current noise (3 pA p-p) allows use of 1 MΩ resistors with 0.1 µF capacitors - enabling compact, low-cost 1 Hz cutoff without sacrificing 1 µV/°C drift performance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision low-input-bias-current op amp applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD8609ARZ-16-REEL	FET-input quad op amp; 1 pA max IB (vs. 270 pA), but higher 12 nV/√Hz voltage noise (vs. 17 nV/√Hz at 10 Hz) and no guaranteed 0.1–10 Hz p-p noise spec.	Better for >100 MΩ source impedances; less suitable for sub-mV ECG signals due to higher broadband noise.	Select AD8609 when input impedance >100 GΩ is mandatory and low-frequency voltage noise is secondary.
OP2177ARZ-REEL7	Bipolar dual op amp; 2 nA max IB (vs. 270 pA), but superior 0.2 µV/°C max drift and 0.1 µV p-p 0.1–10 Hz noise.	Preferred for ultra-stable DC references or laser diode control where drift dominates over input current.	Choose OP2177 for single/dual-channel applications demanding lowest possible drift, accepting higher IB and dual-only configuration.

Compared with AD8609ARZ-16-REEL and OP2177ARZ-REEL7, AD704ARZ-16-REEL uniquely balances picoampere input bias current, sub-microvolt offset drift, and low 0.1–10 Hz noise in a quad SOIC-16 package - making it the optimal choice for cost-sensitive, space-constrained, multi-channel precision analog systems operating across the industrial temperature range.

Availability

AD704ARZ-16-REEL is available at Aetrix Electronics and suitable for industrial process controls, medical instrumentation, and low-frequency active filter designs requiring stable component supply with RoHS-compliant packaging and extended temperature support (−40°C to +85°C).

Supply support for AD704ARZ-16-REEL 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, with design and manufacturing facilities worldwide.

The AD704 belongs to Analog Devices' precision operational amplifier product line, engineered specifically for DC-accurate, low-power, multi-channel signal conditioning in industrial, medical, and test equipment where input bias current, offset drift, and low-frequency noise are critical.

FAQ

What is the maximum input bias current specification for AD704ARZ-16-REEL?

The AD704ARZ-16-REEL has a maximum input bias current of 270 pA at 25°C, as specified in Table 2 of the Rev. E datasheet. This value applies to both inputs across the full industrial temperature range (−40°C to +85°C), with typical drift of only 0.3 pA/°C - significantly lower than conventional BiFET amplifiers. This enables reliable operation with high-impedance sources without external bias compensation networks.

Is AD704ARZ-16-REEL unity-gain stable?

Yes, AD704ARZ-16-REEL is internally compensated for unity-gain stability, as confirmed in the General Description section and Figure 23 (open-loop gain/phase plot). It achieves stable operation with closed-loop gains ≥1 without requiring external compensation components - simplifying design for buffer, follower, and low-gain instrumentation configurations.

What package type does AD704ARZ-16-REEL use?

AD704ARZ-16-REEL uses a 16-lead SOIC_W (wide-body) package, designated RW-16 per the Ordering Guide. Its dimensions comply with JEDEC MS-013-AA: 10.0–10.65 mm width, 7.4–7.6 mm length, and 1.27 mm lead pitch. The "Z" suffix indicates RoHS-compliant finish, and "REEL" denotes tape-and-reel packaging for automated assembly.

Does AD704ARZ-16-REEL require external balancing resistors?

No, AD704ARZ-16-REEL does not require external balancing resistors due to its ultra-low 270 pA max input bias current - approximately 1/20 that of the OP07. The datasheet explicitly states this eliminates the commonly used balancing resistor, reducing component count and PCB area. Optional balancing resistors may be added only to improve high-temperature performance beyond 85°C.

What is the supply voltage range for AD704ARZ-16-REEL?

AD704ARZ-16-REEL operates from ±2.0 V to ±18 V DC supply rails, with rated performance at ±15 V. The absolute maximum rating is ±18 V. Quiescent current remains within 1.5–2.4 mA total (600 µA per amplifier) across this full range, supporting flexible power architecture design in both dual-rail and split-supply systems.

AD704ARZ-16-REEL Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 16-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: General Purpose

Number of Circuits:: 4

Output Type:: -

Slew Rate:: 0.1V/µs

Gain Bandwidth Product:: 800 kHz

-3db Bandwidth:: 800 kHz

Current - Input Bias:: 100 pA

Voltage - Input Offset:: 50 µV

Current - Supply:: 1.5mA (x4 Channels)

Current - Output / Channel:: 15 mA

Voltage - Supply Span (Min):: 4 V

Voltage - Supply Span (Max):: 36 V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

AD704ARZ-16-REEL FAQ

1.How can I place an order for AD704ARZ-16-REEL through Aetrix?

Please submit a Request for Quotation (RFQ) for AD704ARZ-16-REEL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AD704ARZ-16-REEL reliable?

The price and inventory of AD704ARZ-16-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD704ARZ-16-REEL is usually 5 days.

3.What payment methods are accepted for AD704ARZ-16-REEL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD704ARZ-16-REEL transactions.

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4.How is shipping managed for AD704ARZ-16-REEL?

AD704ARZ-16-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD704ARZ-16-REEL order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AD704ARZ-16-REEL?

For technical support, including AD704ARZ-16-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD704ARZ-16-REEL requirements.

6.How does Aetrix verify that AD704ARZ-16-REEL is sourced from the original manufacturer or authorized distributors?

All AD704ARZ-16-REEL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD704ARZ-16-REEL meets industry standards.

7.What is the process for return or replacement of AD704ARZ-16-REEL?

All AD704ARZ-16-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD704ARZ-16-REEL, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AD704ARZ-16-REEL part is unused and in its original packaging.

Return procedure for AD704ARZ-16-REEL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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