Analog Devices

AD8618ARZ - 20MHz CMOS Quad Rail-to-Rail Op Amp | Analog Devices

Name: AD8618ARZ
Brand: Analog Devices
Price: 2.83 USD
Availability: InStock

MPN: AD8618ARZ ✓ Active

In Stock Ships in 1-3 business days

2.7 V to 5 V Vdss 0.2 pA (typ) Id 14-SOIC Package

From $2.83 USD / Unit

MOQ: 1 |

Price updated: 2026-08-23

Volume Pricing

Qty	Unit Price	Extended
1	$4.35	$4.35
10	$3.92	$39.20
100	$3.49	$349.00
500	$3.14	$1,570.00
1,000	$2.83	$2,830.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for AD8618ARZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

AD8608ARZ

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Analog Devices

📦 14-SOIC

4 · 2.7 V to 5.5 V · 65 µV · 1 pA · 8 nV/√Hz · 10 MHz · 1000 V/mV · Yes

✓ In Stock

$1.82 / Unit

View Datasheet →

ℹ️ 4 cross-package part(s) hidden — different package requires PCB rework and is not a true drop-in replacement. Contact us if you need cross-package suggestions.

AD8618ARZ Maximum Ratings & Electrical Characteristics

Number of Channels	4
Supply Voltage Range	2.7 V to 5 V
Gain Bandwidth Product	20 MHz
Slew Rate	12 V/µs
Offset Voltage (max)	65 µV
Input Voltage Noise Density	8 nV/√Hz
Input Bias Current	0.2 pA (typ)
Rail-to-Rail Input	Yes
Rail-to-Rail Output	Yes
Operating Temperature Range	-40°C to +125°C
Package	14-SOIC
Mounting Type	Surface Mount
RoHS Status	Compliant
Amplifier Type	CMOS
Output Current per Channel	[DATA_NEEDED: Output Current per Channel]

AD8618ARZ Pin Configuration

Pin 1	OUT A — Output of amplifier A
Pin 2	-IN A — Inverting input of amplifier A
Pin 3	+IN A — Non-inverting input of amplifier A
Pin 4	V+ — Positive supply
Pin 5	+IN B — Non-inverting input of amplifier B
Pin 6	-IN B — Inverting input of amplifier B
Pin 7	OUT B — Output of amplifier B
Pin 8	OUT C — Output of amplifier C
Pin 9	-IN C — Inverting input of amplifier C
Pin 10	+IN C — Non-inverting input of amplifier C
Pin 11	V- — Negative supply (ground in single-supply)
Pin 12	+IN D — Non-inverting input of amplifier D
Pin 13	-IN D — Inverting input of amplifier D
Pin 14	OUT D — Output of amplifier D

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

AD8618ARZ is suitable for 6 applications: Portable Instrumentation, Active Filters, ADC Driver, Audio Signal Conditioning, Medical Sensing, Industrial Control.

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Portable Instrumentation

The AD8618ARZ's low power consumption and rail-to-rail operation make it ideal for battery-powered instruments. Its 2.7V to 5V supply range aligns with Li-ion battery outputs, and the low offset voltage (65 µV max) ensures accurate measurements. The quad configuration allows multiple signal conditioning channels in a compact footprint, reducing board space and extending battery life in handheld multimeters and data loggers.

Recommended

🔧

Active Filters

With a 20 MHz gain bandwidth product and 12 V/µs slew rate, the AD8618ARZ is well-suited for active filter designs in communication and audio systems. The high bandwidth allows implementation of Butterworth or Chebyshev filters up to several megahertz. The low noise (8 nV/√Hz) preserves signal-to-noise ratio, and the rail-to-rail output maximizes dynamic range. Each of the four amplifiers can be used for a different filter stage, enabling compact multi-pole designs.

Recommended

AD9833BRUZ · Analog Devices AD7606BSTZ-4RL · Analog Devices

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ADC Driver

The AD8618ARZ can drive high-resolution ADCs with its low output impedance and rail-to-rail output. Its 20 MHz bandwidth ensures minimal settling time for fast sampling rates, and the low noise (8 nV/√Hz) does not degrade the ADC's SNR. The quad configuration allows buffering multiple ADC inputs, such as in a data acquisition system. The device's low offset voltage (65 µV) minimizes DC errors in the signal chain.

Recommended

AD7172-2BRUZ · Analog Devices AD7606BSTZ-4RL · Analog Devices

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Audio Signal Conditioning

The AD8618ARZ's low noise (8 nV/√Hz) and wide bandwidth (20 MHz) make it suitable for audio preamplifiers and equalizers. The rail-to-rail output allows maximum signal swing without clipping, and the low distortion ensures high-fidelity reproduction. The quad configuration enables stereo channels with additional filtering or mixing stages. Its single-supply operation simplifies audio system design, and the low power consumption is beneficial for portable audio devices.

Recommended

ADAU1701 (SigmaDSP audio processor for digital audio) AD1862 (High-performance stereo DAC)

💊

Medical Sensing

In medical devices like ECG and pulse oximeters, the AD8618ARZ provides low-noise amplification of biosignals. Its low input bias current (0.2 pA) minimizes loading on high-impedance electrodes, and the low offset voltage (65 µV) reduces baseline drift. The 2.7V to 5V supply range is compatible with battery-powered medical monitors. The quad configuration allows multiple signal channels for multi-lead ECG, and the wide bandwidth supports fast signal transients.

Recommended

AD823ARZ · Analog Devices AD7793BRUZ · Analog Devices

🏭

Industrial Control

The AD8618ARZ is used in industrial control systems for signal conditioning of sensors and actuators. Its wide supply range (2.7V to 5V) and rail-to-rail operation interface directly with microcontrollers and ADCs. The low offset voltage ensures accurate process control, and the 20 MHz bandwidth supports fast control loops. The quad configuration reduces component count in multi-channel PLCs and motor controllers, and the -40°C to +125°C temperature range suits harsh environments.

Recommended

AD7606BSTZ-4RL · Analog Devices AD5422ACPZ · Analog Devices

Recommended Products Summary

AD7793BRUZ Analog Devices Used in: Portable Instrumentation, Medical Sensing REF192ESZ Analog Devices Used in: Portable Instrumentation AD9833BRUZ Analog Devices Used in: Active Filters AD7606BSTZ-4RL Analog Devices Used in: Active Filters, ADC Driver, Industrial Control AD7172-2BRUZ Analog Devices Used in: ADC Driver ADAU1701 SigmaDSP audio processor for digital audio Used in: Audio Signal Conditioning AD1862 High-performance stereo DAC Used in: Audio Signal Conditioning AD823ARZ Analog Devices Used in: Medical Sensing AD5422ACPZ Analog Devices Used in: Industrial Control

What is the supply voltage range of AD8618ARZ?

The AD8618ARZ operates from a single 2.7V to 5V supply. According to the Analog Devices datasheet (Rev. G), this range supports battery-powered and low-voltage applications. The rail-to-rail input and output stages allow full dynamic range within this supply window.

What is the gain bandwidth product of AD8618ARZ?

The AD8618ARZ has a gain bandwidth product of 20 MHz. This wide bandwidth, combined with a slew rate of 12 V/µs, makes it suitable for high-speed signal conditioning and active filter applications. The datasheet specifies these parameters at a 5V supply.

What is the offset voltage of AD8618ARZ?

The AD8618ARZ has a maximum offset voltage of 65 µV. This low offset is achieved through a patented trimming technique, ensuring high DC accuracy in precision applications. The typical offset is even lower, as stated in the datasheet.

What is the input noise density of AD8618ARZ?

The AD8618ARZ has an input voltage noise density of 8 nV/√Hz. This low noise, combined with a 20 MHz bandwidth, makes it suitable for audio and sensor applications where signal integrity is critical. The datasheet provides noise performance curves for various conditions.

Is AD8618ARZ rail-to-rail?

Yes, the AD8618ARZ features rail-to-rail input and output stages. This allows the output to swing within millivolts of the supply rails, maximizing dynamic range in single-supply applications. The input common-mode range extends beyond the rails, as specified in the datasheet.

What is the package of AD8618ARZ?

The AD8618ARZ is available in a 14-lead SOIC package. This compact surface-mount package is suitable for space-constrained PCB designs. The 'R' in the part number indicates the SOIC package, and 'Z' denotes lead-free (RoHS compliant) finish.

What are the typical applications of AD8618ARZ?

The AD8618ARZ is used in portable instrumentation, active filters, ADC drivers, and audio signal conditioning. Its low noise, wide bandwidth, and rail-to-rail operation make it ideal for battery-powered and precision analog systems. The quad configuration reduces board space in multi-channel designs.

Where can I buy AD8618ARZ?

AD8618ARZ is available from authorized distributors such as DigiKey and Mouser. As of 2026-08-23, DigiKey lists it with pricing starting at $4.35 for single-unit quantities. Check current stock and lead times on their websites.

What is the price of AD8618ARZ?

As of 2026-08-23, the 1,000-unit price for AD8618ARZ is approximately $2.83, according to Analog Devices' product page. Distributor pricing may vary; DigiKey lists single-unit price at $4.35. For volume pricing, contact distributors directly.

What is the lead time for AD8618ARZ?

Lead time for AD8618ARZ varies by distributor and stock levels. As of 2026-08-23, DigiKey indicates it ships today for in-stock quantities. For larger orders, typical lead time is 4-6 weeks. Check distributor websites for real-time availability.

Is AD8618ARZ in stock?

As of 2026-08-23, AD8618ARZ is in stock at major distributors like DigiKey and Mouser. DigiKey shows it as 'ships today' for immediate orders. For high-volume requirements, verify stock levels with your preferred distributor.

AD8618ARZ vs AD8608ARZ - which is better for audio?

Both AD8618ARZ and AD8608ARZ are quad CMOS op amps, but AD8618 has a higher bandwidth (20 MHz vs 10 MHz) and lower noise (8 nV/√Hz vs 12 nV/√Hz). For audio applications, AD8618ARZ offers better performance due to lower noise and wider bandwidth, making it preferable for high-fidelity signal paths.

What is the difference between AD8618ARZ and AD8608ARZ?

The AD8618ARZ has a gain bandwidth of 20 MHz and noise of 8 nV/√Hz, while the AD8608ARZ has 10 MHz bandwidth and 12 nV/√Hz noise. Both are quad rail-to-rail CMOS op amps in 14-SOIC, but AD8618 offers higher speed and lower noise, making it better for precision and high-frequency applications.

When should I choose AD8618ARZ over AD8608ARZ?

Choose AD8618ARZ when you need higher bandwidth (20 MHz) and lower noise (8 nV/√Hz) for applications like active filters, ADC drivers, or audio processing. If power consumption is a concern and bandwidth requirements are lower, AD8608ARZ may be sufficient, but AD8618 provides superior AC performance.

What is the best drop-in replacement for AD8618ARZ?

The AD8608ARZ is a drop-in replacement for AD8618ARZ, sharing the same 14-SOIC package and pinout. However, it has lower bandwidth (10 MHz) and higher noise (12 nV/√Hz). For a closer match, consider the AD8618ARUZ (TSSOP) if package is not critical, but for SOIC, AD8608ARZ is the direct alternative.

Can AD8608ARZ replace AD8618ARZ?

Yes, AD8608ARZ can replace AD8618ARZ in most applications, as it is pin-compatible and has similar supply voltage range. However, verify that the lower bandwidth (10 MHz vs 20 MHz) and higher noise (12 nV/√Hz vs 8 nV/√Hz) are acceptable for your design. For high-speed or low-noise requirements, AD8618ARZ is preferred.

Where can I download the AD8618ARZ datasheet PDF?

The AD8618ARZ datasheet is available for download from Analog Devices' website at https://www.analog.com/media/en/technical-documentation/data-sheets/AD8615_8616_8618.pdf. It is also available on distributor sites like DigiKey and Mouser, and on datasheet aggregators like alldatasheet.com.

Where can I find the AD8618ARZ pinout?

The AD8618ARZ pinout is detailed in the datasheet on page 3. It is a 14-lead SOIC with four op amps; each has non-inverting input, inverting input, and output pins. The pinout is also available on distributor product pages and in the datasheet PDF from Analog Devices.

Hey Google, what can replace AD8618ARZ?

The AD8608ARZ is a direct drop-in replacement for AD8618ARZ, with the same 14-SOIC package and pinout. Other alternatives include the OPA4227 (Texas Instruments) and MCP6L04 (Microchip), but verify pin compatibility. For best performance, AD8618ARZ remains the preferred choice.

Is AD8618ARZ the same as AD8608ARZ?

No, AD8618ARZ and AD8608ARZ are different parts. AD8618ARZ has a 20 MHz bandwidth and 8 nV/√Hz noise, while AD8608ARZ has 10 MHz and 12 nV/√Hz. They are pin-compatible but not identical; AD8618 offers higher speed and lower noise.

What are the key specifications of AD8618ARZ that engineers should know?

The AD8618ARZ is a quad CMOS op amp with 20 MHz gain bandwidth, 12 V/µs slew rate, 65 µV max offset, and 8 nV/√Hz noise. It operates from 2.7V to 5V, features rail-to-rail I/O, and comes in a 14-SOIC package. These specs make it suitable for precision, high-speed, and low-noise applications.

What is the best Texas Instruments equivalent for AD8618ARZ?

The Texas Instruments OPA4227 is a quad precision op amp with similar specifications, but it is not pin-compatible with the 14-SOIC package. For a drop-in replacement, consider the OPA4227 in SOIC-14 if pinout matches, but verify. Alternatively, the OPA4340 is a rail-to-rail CMOS quad with 5.5 MHz bandwidth, but lower speed.

Engineering reference data for AD8618ARZ — comparison, design guidance, and compliance information.

Selection Guide

Choose AD8618ARZ when you need a quad CMOS op amp with high bandwidth (20 MHz) and low noise (8 nV/√Hz) for applications like active filters, ADC drivers, and audio processing. If you can tolerate lower bandwidth and higher noise, AD8608ARZ is a cost-effective drop-in alternative. For dual-channel designs, consider AD8606ARZ. If you require a TSSOP package, AD8618ARUZ offers the same performance. For higher supply voltages (±18V), the OPA4227 from TI is an option, but it is not pin-compatible. Always verify pinout and package compatibility before substitution.

Comparison with Alternatives

Parameter	This Product	AD8608ARZ	AD8618ARUZ	OPA4227PA
Package	14-SOIC	14-SOIC	14-TSSOP	14-DIP
Brand	Analog Devices	Analog Devices	Analog Devices	Texas Instruments
Number of Channels	4	4	4	4
Gain Bandwidth Product	20 MHz	10 MHz	20 MHz	8 MHz
Slew Rate	12 V/µs	5 V/µs	12 V/µs	2.3 V/µs
Offset Voltage (max)	65 µV	65 µV	65 µV	75 µV
Input Noise Density	8 nV/√Hz	12 nV/√Hz	8 nV/√Hz	4.5 nV/√Hz
Supply Voltage Range	2.7V to 5V	2.7V to 5V	2.7V to 5V	±2.5V to ±18V

Key Differentiators

Higher bandwidth than AD8608ARZ (vs AD8608ARZ)
Lower noise than AD8608ARZ (vs AD8608ARZ)
Lower offset voltage than OPA4227 (vs OPA4227PA)

Design Notes

The AD8618ARZ operates from a single 2.7V to 5V supply. Use a 0.1 µF ceramic capacitor close to each supply pin (V+ and V-) to decouple high-frequency noise. For optimal performance, a 10 µF tantalum capacitor in parallel is recommended for low-frequency stability. Ensure the supply voltage does not exceed 5V to avoid damage.

For best noise performance, keep the input traces short and shielded from digital signals. Use a ground plane under the op amp to reduce parasitic capacitance and noise pickup. Place the feedback resistors close to the inverting input to minimize stray capacitance, which can cause instability. The 14-SOIC package has a 1.27 mm pitch, allowing standard PCB routing.

The rail-to-rail output stage can drive capacitive loads, but large capacitances ( >100 pF) may cause oscillation. Add a series resistor (e.g., 50Ω) at the output to isolate capacitive loads. Also, avoid exceeding the input common-mode range, even though it extends beyond the rails; doing so may cause phase reversal. Always refer to the datasheet's absolute maximum ratings.