Analog Devices

AD8608ARZ - Quad Precision CMOS Rail-to-Rail Op Amp | Analog Devices

Name: AD8608ARZ
Brand: Analog Devices
Price: 1.85 USD
Availability: InStock

MPN: AD8608ARZ ✓ Active

In Stock Ships in 1-3 business days

2.7 V to 5.5 V Vdss 1.7 mA (typical) Id 14-lead SOIC (narrow) Package

From $1.85 USD / Unit

MOQ: 1 |

Price updated: 2026-08-21

Volume Pricing

Qty	Unit Price	Extended
1	$2.85	$2.85
10	$2.56	$25.60
100	$2.28	$228.00
500	$2.05	$1,025.00
1,000	$1.85	$1,850.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for AD8608ARZ — 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-REEL7

✅ Drop-In

📦 14-lead SOIC

Same die and package, tape and reel packaging variant

📋 Reference alternative (not in catalog)

OPA4340

✅ Drop-In

📦 14-lead SOIC

Quad CMOS rail-to-rail op amp, similar supply range but higher offset and bias current

📋 Reference alternative (not in catalog)

MCP6L04

✅ Drop-In

📦 14-lead SOIC

Quad CMOS op amp, rail-to-rail, lower bandwidth (1 MHz) and higher offset (150 µV)

📋 Reference alternative (not in catalog)

OPA4376

✅ Drop-In

📦 14-lead SOIC

Quad precision op amp, lower offset (25 µV) but lower bandwidth (5.5 MHz)

📋 Reference alternative (not in catalog)

ℹ️ 2 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.

AD8608ARZ Maximum Ratings & Electrical Characteristics

Number of Channels	4
Amplifier Type	CMOS
Output Type	Rail-to-Rail
Input Type	Rail-to-Rail
Supply Voltage Range	2.7 V to 5.5 V
Supply Current (per channel)	1.7 mA (typical)
Gain Bandwidth Product	10 MHz
Slew Rate	5 V/µs
Input Offset Voltage	65 µV maximum
Input Bias Current	1 pA maximum
Input Voltage Noise Density	8 nV/√Hz
Open-Loop Gain	1000 V/mV
Unity Gain Stable	Yes
Operating Temperature Range	-40°C to +125°C
Package	14-lead SOIC (narrow)
Mounting Type	Surface Mount
RoHS Status	Compliant

AD8608ARZ 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 voltage
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 voltage (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

AD8608ARZ is suitable for 6 applications: Photodiode Amplifier, Active Filter, Battery-Powered Instrumentation, Audio Signal Conditioning, Sensor Signal Conditioning, Portable Medical Devices.

🔧

Photodiode Amplifier

The AD8608ARZ's ultra-low input bias current (1 pA) and low noise (8 nV/√Hz) make it ideal for transimpedance amplifiers in photodiode sensors. The rail-to-rail output allows full-scale voltage swing for the ADC interface. In a typical configuration, the photodiode is connected between the inverting input and ground, with a feedback resistor setting the gain. The low bias current minimizes dark current errors, and the wide bandwidth supports fast optical signals. For best performance, use a low-leakage PCB layout and guard rings around the input pins.

Recommended

AD8605 (Single version of the same amplifier family) AD8606 (Dual version of the same amplifier family)

🔧

Active Filter

The AD8608ARZ's 10 MHz bandwidth and high open-loop gain (1000 V/mV) enable precise active filters for anti-aliasing and signal conditioning. The quad configuration allows implementing multiple filter stages in one package. For a 2nd-order low-pass filter, the gain-bandwidth product ensures accurate response up to 1 MHz. The rail-to-rail output maximizes dynamic range in single-supply systems. Use precision resistors and capacitors to maintain filter accuracy, and consider the amplifier's input capacitance when designing high-impedance filter networks.

Recommended

AD8605 (Single version for filter stages) AD8606 (Dual version for filter stages)

💊

Battery-Powered Instrumentation

The AD8608ARZ operates from 2.7 V to 5.5 V, making it suitable for battery-powered devices. Its low supply current (1.7 mA per channel) extends battery life. The rail-to-rail input/output allows full use of the supply range, and the low offset voltage ensures accurate measurements. In portable medical devices, the quad amplifier can condition multiple sensor signals. Use power-saving modes if available, and ensure proper decoupling to maintain stability.

Recommended

AD8605 (Single version for low-power designs) AD8606 (Dual version for low-power designs)

🎧

Audio Signal Conditioning

The AD8608ARZ's low noise (8 nV/√Hz) and wide bandwidth (10 MHz) make it suitable for audio applications such as headphone amplifiers and active crossovers. The rail-to-rail output provides maximum headroom in single-supply audio systems. The low distortion and high slew rate (5 V/µs) preserve signal integrity. In a headphone amplifier, the quad op amp can be used for left/right channels and a virtual ground. Use high-quality audio capacitors and keep signal paths short to minimize noise pickup.

Recommended

AD8605 (Single version for audio stages) AD8606 (Dual version for stereo audio)

🧩

Sensor Signal Conditioning

The AD8608ARZ's low offset (65 µV) and low bias current (1 pA) make it ideal for conditioning signals from high-impedance sensors like pH probes, thermocouples, and strain gauges. The quad configuration allows multiple sensor channels to be processed in one IC. The rail-to-rail input/output simplifies interfacing with ADCs. For thermocouple applications, the low offset minimizes measurement error. Use appropriate filtering and shielding to reduce noise.

Recommended

AD8605 (Single version for sensor interfaces) AD8606 (Dual version for sensor interfaces)

💊

Portable Medical Devices

The AD8608ARZ's low power consumption and small footprint make it suitable for portable medical devices like glucose monitors and pulse oximeters. The low bias current is critical for high-impedance biosensors. The quad amplifier can process multiple signals, such as ECG and temperature, in a compact design. The wide bandwidth supports fast signal acquisition. Ensure compliance with medical safety standards and use proper isolation if needed.

Recommended

AD8605 (Single version for medical sensors) AD8606 (Dual version for medical sensors)

Recommended Products Summary

AD8605 Single version of the same amplifier family Used in: Photodiode Amplifier, Active Filter, Battery-Powered Instrumentation, Audio Signal Conditioning, Sensor Signal Conditioning, Portable Medical Devices AD8606 Dual version of the same amplifier family Used in: Photodiode Amplifier, Active Filter, Battery-Powered Instrumentation, Audio Signal Conditioning, Sensor Signal Conditioning, Portable Medical Devices

What is the supply voltage range of AD8608ARZ?

The AD8608ARZ operates from a single supply voltage of 2.7 V to 5.5 V. According to the Analog Devices datasheet (AD8605_8606_8608), this rail-to-rail input/output amplifier is designed for low-voltage, single-supply applications, making it suitable for battery-powered devices.

What is the input offset voltage of AD8608ARZ?

The AD8608ARZ has a maximum input offset voltage of 65 µV. This low offset is achieved through precision CMOS trimming, as stated in the AD8605_8606_8608 datasheet. This makes the amplifier ideal for precision applications such as sensor signal conditioning and instrumentation.

What is the input bias current of AD8608ARZ?

The AD8608ARZ has a maximum input bias current of 1 pA. This extremely low bias current is a result of the CMOS input stage, as documented in the Analog Devices datasheet. It enables the amplifier to interface with high-impedance sources like photodiodes and pH sensors without significant loading errors.

What is the bandwidth of AD8608ARZ?

The AD8608ARZ has a gain bandwidth product of 10 MHz. This wide bandwidth, combined with a slew rate of 5 V/µs, allows the amplifier to handle high-frequency signals, making it suitable for active filters and video applications, as noted in the AD8605_8606_8608 datasheet.

Is AD8608ARZ rail-to-rail?

Yes, the AD8608ARZ features rail-to-rail input and output stages. This means the input common-mode voltage range and output voltage swing can reach both supply rails, maximizing dynamic range in single-supply systems. This is confirmed in the Analog Devices datasheet.

What is the package of AD8608ARZ?

The AD8608ARZ is available in a 14-lead SOIC (narrow) package. According to the datasheet, the quad AD8608 is offered in both 14-lead TSSOP and narrow 14-lead SOIC packages. The SOIC package is suitable for surface-mount assembly and is widely used in industrial and consumer electronics.

What is the price of AD8608ARZ?

As of 2026-08-21, the AD8608ARZ is priced at approximately $2.85 for single-unit quantities, with volume pricing dropping to around $1.85 at 1000 units. Prices are based on distributor listings from Mouser and DigiKey and may vary with availability and order quantity.

Where can I buy AD8608ARZ?

The AD8608ARZ is available from major distributors such as Mouser Electronics, DigiKey, and Octopart. As of 2026-08-21, it is in stock at Mouser and DigiKey. You can also purchase directly from Analog Devices or through authorized distributors. Check current stock and pricing on their websites.

What is the lead time for AD8608ARZ?

The typical lead time for AD8608ARZ is 4 to 6 weeks from major distributors, but it may vary based on stock levels and order quantity. As of 2026-08-21, Mouser and DigiKey show the part as in stock, so immediate shipment is possible for small quantities. For larger orders, confirm lead time with the distributor.

Is AD8608ARZ in stock?

As of 2026-08-21, the AD8608ARZ is in stock at Mouser Electronics and DigiKey. Availability can change quickly, so it is recommended to check the distributor websites for real-time inventory. Octopart also lists multiple distributors with stock and pricing.

AD8608ARZ vs AD8606ARZ - which is better for a quad op amp application?

The AD8608ARZ is a quad op amp, while the AD8606ARZ is a dual op amp. For a quad op amp application, the AD8608ARZ is the appropriate choice because it integrates four amplifiers in one package, saving board space and cost. Both share similar specifications, but the AD8608ARZ provides four channels instead of two.

When should I choose AD8608ARZ over OPA4340?

Choose the AD8608ARZ when you need lower input bias current (1 pA vs. 10 pA for OPA4340) and lower offset voltage (65 µV vs. 500 µV). The AD8608ARZ also has a wider bandwidth (10 MHz vs. 5.5 MHz). However, if you require a higher supply voltage (up to 5.5 V only), the OPA4340 may be better for higher voltage applications.

What is the best drop-in replacement for AD8608ARZ?

The best drop-in replacement for AD8608ARZ is the AD8608ARUZ (TSSOP package) if you can accommodate the package change, or the AD8608ARZ-REEL7 (same SOIC package, tape and reel). For a pin-compatible alternative from another brand, consider the OPA4340 (SOIC-14) or the MCP6L04 (SOIC-14), but verify pinout and specifications.

Where can I download the AD8608ARZ datasheet PDF?

You can download the AD8608ARZ datasheet PDF from the Analog Devices website at https://www.analog.com/media/en/technical-documentation/data-sheets/AD8605_8606_8608.pdf. It is also available on distributor sites like Mouser and DigiKey, and on datasheet aggregators like alldatasheet.com.

What are the key specifications of AD8608ARZ that engineers should know?

The AD8608ARZ is a quad CMOS op amp with rail-to-rail input/output, operating from 2.7 V to 5.5 V. Key specs include 65 µV max offset voltage, 1 pA max bias current, 8 nV/√Hz noise, 10 MHz bandwidth, and 1000 V/mV open-loop gain. It is unity-gain stable and available in SOIC-14. These specs make it ideal for precision, low-power, and high-impedance applications.

What is the best Texas Instruments equivalent for AD8608ARZ?

The best Texas Instruments equivalent for AD8608ARZ is the OPA4340, which is a quad, rail-to-rail CMOS op amp in SOIC-14. It has similar supply voltage range (2.5 V to 5.5 V) and bandwidth (5.5 MHz), but higher offset voltage (500 µV) and bias current (10 pA). For a closer match, consider the OPA4376 (quad, 5.5 MHz, 25 µV offset) but verify pin compatibility.

Engineering reference data for AD8608ARZ — comparison, design guidance, and compliance information.

Selection Guide

Choose the AD8608ARZ when you need a quad, precision CMOS op amp with ultra-low bias current (1 pA), low offset (65 µV), and wide bandwidth (10 MHz) in a 14-lead SOIC package. It is ideal for photodiode amplifiers, active filters, and battery-powered instrumentation. If you require a smaller package, consider the AD8608ARUZ (TSSOP) but note the different footprint. For a lower-cost alternative with similar pinout, the OPA4340 from TI offers a quad rail-to-rail op amp but with higher offset and bias current. The MCP6L04 from Microchip is another option but has lower bandwidth. For applications needing even lower offset, the OPA4376 provides 25 µV offset but lower bandwidth. Always verify pin compatibility and specifications before substitution.

Comparison with Alternatives

Parameter	This Product	AD8608ARUZ	OPA4340	MCP6L04
Package	14-lead SOIC	14-lead TSSOP	14-lead SOIC	14-lead SOIC
Brand	Analog Devices	Analog Devices	Texas Instruments	Microchip Technology
Number of Channels	4	4	4	4
Supply Voltage Range	2.7 V to 5.5 V	2.7 V to 5.5 V	2.5 V to 5.5 V	2.7 V to 6.0 V
Input Offset Voltage (max)	65 µV	65 µV	500 µV	150 µV
Input Bias Current (max)	1 pA	1 pA	10 pA	1 pA
Gain Bandwidth Product	10 MHz	10 MHz	5.5 MHz	1 MHz
Input Voltage Noise Density	8 nV/√Hz	8 nV/√Hz	25 nV/√Hz	27 nV/√Hz

Key Differentiators

Ultra-low input bias current of 1 pA (vs OPA4340)
Lower input offset voltage of 65 µV (vs OPA4340)
Wider bandwidth of 10 MHz (vs MCP6L04)

Design Notes

The AD8608ARZ operates from a single supply of 2.7 V to 5.5 V. For optimal performance, use a clean power supply with low ripple. Place a 0.1 µF ceramic capacitor close to each supply pin (V+ and V-) and a 10 µF tantalum capacitor at the power entry point. In single-supply operation, connect V- to ground and ensure the input common-mode range includes ground.

For high-impedance applications, use guard rings around the input pins to minimize leakage currents. Keep the feedback network close to the amplifier and use short traces to reduce parasitic capacitance. For photodiode amplifiers, place the photodiode and feedback resistor as close as possible to the input pins. Use a ground plane to reduce noise.

The AD8608ARZ is unity-gain stable, but driving capacitive loads greater than 100 pF may cause oscillation. Add a series resistor (e.g., 50 Ω) at the output to isolate the capacitive load. Also, avoid exceeding the absolute maximum supply voltage of 6 V, and ensure the input voltages do not exceed the supply rails by more than 0.3 V to prevent latch-up.