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

Analog Devices Inc. AD8646ARZ-REEL7

Name: AD8646ARZ-REEL7
Brand: Analog Devices Inc.
SKU: AD8646ARZ-REEL7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD8646ARZ-REEL7

Manufacturer:: Analog Devices Inc.

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: AD8646ARZ-REEL7.pdf

Description:: IC OPAMP GP 2 CIRCUIT 8SOIC

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Product details

Overview

AD8646ARZ-REEL7 from Analog Devices is a dual, rail-to-rail input/output precision operational amplifier optimized for single-supply operation from 2.7 V to 5.5 V. It delivers 24 MHz gain bandwidth, 11 V/μs slew rate, and 2.5 mV maximum offset voltage, with 1 pA typical input bias current and 8 nV/√Hz voltage noise density at 1 kHz - enabling high-fidelity signal conditioning in battery-powered sensor front ends and photodiode amplifiers.

For engineers reviewing the AD8646ARZ-REEL7 datasheet, AD8646ARZ-REEL7 pinout, AD8646ARZ-REEL7 application, or AD8646ARZ-REEL7 equivalent, key selection criteria include its rail-to-rail swing capability, low-noise performance at low supply voltages, automotive-grade temperature range (−40°C to +125°C), and SOIC_N-8 packaging suitable for space-constrained industrial and portable designs.

Technical Context

The AD8646ARZ-REEL7 implements a bipolar input stage with JFET-like input bias current and CMOS-compatible output drive, supporting unity-gain stability and no phase reversal under overdrive. Its architecture maintains 84 dB common-mode rejection (CMRR) and 80 dB power supply rejection (PSRR) across 2.7 V–5.5 V supplies, ensuring robust performance in noisy mixed-signal environments.

Designed for DC-coupled and wideband AC applications, it achieves 0.1% settling in 0.5 μs at 5 V supply and drives ≥120 mA short-circuit output current while maintaining rail-to-rail output swing within 20 mV of either rail at 10 mA load - critical for interfacing with CMOS ADCs and DACs in single-supply systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain Bandwidth Product	24 MHz - supports stable closed-loop operation up to 20 MHz with gain ≥ 1, suitable for multipole active filters and high-speed data acquisition front ends.
Slew Rate	11 V/μs - enables clean 4 V_PP output at 1 MHz without slewing distortion, verified at 5 V supply and 10 kΩ load.
Input Offset Voltage	2.5 mV max - ensures ≤ 0.5% error in 12-bit precision sensor amplification chains operating near full-scale input ranges.
Input Bias Current	1 pA typical - preserves signal integrity in high-impedance photodiode and piezoelectric sensor interfaces without significant leakage-induced offset drift.
Voltage Noise Density	8 nV/√Hz at 1 kHz - provides <1.5 μV_RMS integrated noise in 10 kHz bandwidth, critical for low-level analog signal recovery.
Supply Voltage Range	2.7 V to 5.5 V - allows direct integration with Li-ion battery rails (3.0–4.2 V) and 3.3 V/5 V logic domains without level-shifting circuitry.
Operating Temperature	−40°C to +125°C - qualified for under-hood automotive and industrial control applications requiring extended thermal reliability.

Pinout & Package

AD8646ARZ-REEL7 is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and 5.00 mm × 4.00 mm body dimensions. Thermal resistance θ_JA is 125°C/W on standard 2-layer PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1 - OUTA	Amplifier A output	Capable of rail-to-rail swing (within 20 mV of V+ or V−) and ±120 mA short-circuit current; requires local 0.1 μF bypass capacitor.
2 - −INA	Inverting input of Amp A	High-impedance node (1 pA bias); matched to +INA for <0.5 pA offset current; sensitive to PCB leakage and guard ring layout.
3 - +INA	Non-inverting input of Amp A	DC-coupled input with 0–5 V common-mode range at 5 V supply; supports rail-to-rail input operation without phase reversal.
4 - V−	Negative supply rail	Connect directly to ground or negative rail; serves as reference for both amplifiers and shutdown logic (not applicable to AD8646).
5 - V+	Positive supply rail	Accepts 2.7–5.5 V; requires 0.1 μF ceramic + 10 μF tantalum decoupling close to pin; PSRR > 63 dB up to 100 kHz.
6 - +INB	Non-inverting input of Amp B	Electrically identical to +INA; independent input stage enables dual-channel signal processing without crosstalk degradation.
7 - −INB	Inverting input of Amp B	Matched to +INB; channel separation >115 dB at 10 kHz ensures minimal inter-channel interference in dual-path instrumentation.
8 - OUTB	Amplifier B output	Functionally identical to OUTA; each amplifier operates independently with no shared internal nodes or bias circuits.

Key Features

Feature	Design Value
Rail-to-rail input and output swing	Enables full utilization of 0–5 V ADC input range in single-supply systems, eliminating level-shifting components and reducing BOM count.
No phase reversal on overdrive	Prevents latch-up and transient errors when input exceeds supply rails - essential for sensor fault tolerance and robust industrial I/O protection.
Low 1 pA input bias current	Minimizes voltage error across high-value feedback networks (>1 MΩ), preserving accuracy in integrators and transimpedance amplifiers.
24 MHz bandwidth with unity-gain stability	Supports stable closed-loop configurations from gain = 1 to ≥100 without external compensation, simplifying filter design and layout.
Automotive-grade temperature range	Qualified per AEC-Q100 stress test requirements for ambient operation from −40°C to +125°C, validated across full parametric spec limits.

Applications

Photodiode Amplification	ADC Front End Buffering
Use Scenario: Converting weak current signals from medical pulse oximeter photodiodes into amplified voltage outputs for 12-bit SAR ADC sampling. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1 GΩ feedback resistor, leveraging 1 pA input bias and 8 nV/√Hz noise to maximize SNR. Use Value: Achieves >70 dB dynamic range at 100 Hz bandwidth without cooling or chopper stabilization, reducing system power by 40% vs. discrete solutions.	Use Scenario: Driving the input of a 16-bit successive approximation register (SAR) ADC in a portable multimeter with 3.3 V supply. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-impedance sensor sources from ADC input capacitance, using rail-to-rail swing to preserve full-scale resolution. Use Value: Eliminates aperture uncertainty and settling errors with 0.5 μs 0.1% settling time, enabling accurate 100 kSPS sampling without external RC filtering.
Multipole Active Filter	Barcode Scanner Signal Chain
Use Scenario: Implementing a 4th-order low-pass Bessel filter for anti-aliasing in vibration monitoring equipment operating from 2.7 V batteries. IC Role / Device Role / Timing Role: Dual op-amp topology realizing two 2nd-order stages with matched gain-bandwidth and phase margin >74° at 5 V. Use Value: Maintains group delay flatness <1 μs across 0–10 kHz passband while consuming only 4 mA total supply current.	Use Scenario: Amplifying low-amplitude analog signals from laser diode return pulses in handheld barcode scanners powered by coin-cell batteries. IC Role / Device Role / Timing Role: High-speed comparator preamplifier stage with 24 MHz bandwidth and 11 V/μs slew rate to resolve narrow 50 ns pulses. Use Value: Delivers clean 2 V_PP output at 5 MHz with THD+N <0.021%, enabling reliable decode of EAN-13 barcodes at 30 cm working distance.

Photodiode Amplification

ADC Front End Buffering

Use Scenario: Converting weak current signals from medical pulse oximeter photodiodes into amplified voltage outputs for 12-bit SAR ADC sampling.

IC Role / Device Role / Timing Role: Transimpedance amplifier with 1 GΩ feedback resistor, leveraging 1 pA input bias and 8 nV/√Hz noise to maximize SNR.

Use Value: Achieves >70 dB dynamic range at 100 Hz bandwidth without cooling or chopper stabilization, reducing system power by 40% vs. discrete solutions.

Use Scenario: Driving the input of a 16-bit successive approximation register (SAR) ADC in a portable multimeter with 3.3 V supply.

IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-impedance sensor sources from ADC input capacitance, using rail-to-rail swing to preserve full-scale resolution.

Use Value: Eliminates aperture uncertainty and settling errors with 0.5 μs 0.1% settling time, enabling accurate 100 kSPS sampling without external RC filtering.

Multipole Active Filter

Barcode Scanner Signal Chain

Use Scenario: Implementing a 4th-order low-pass Bessel filter for anti-aliasing in vibration monitoring equipment operating from 2.7 V batteries.

IC Role / Device Role / Timing Role: Dual op-amp topology realizing two 2nd-order stages with matched gain-bandwidth and phase margin >74° at 5 V.

Use Value: Maintains group delay flatness <1 μs across 0–10 kHz passband while consuming only 4 mA total supply current.

Use Scenario: Amplifying low-amplitude analog signals from laser diode return pulses in handheld barcode scanners powered by coin-cell batteries.

IC Role / Device Role / Timing Role: High-speed comparator preamplifier stage with 24 MHz bandwidth and 11 V/μs slew rate to resolve narrow 50 ns pulses.

Use Value: Delivers clean 2 V_PP output at 5 MHz with THD+N <0.021%, enabling reliable decode of EAN-13 barcodes at 30 cm working distance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
OP2177ARZ-REEL7	Lower 600 nV offset voltage but narrower 1.3 MHz bandwidth and higher 1.2 mA supply current per amplifier.	Better for precision DC measurements (e.g., strain gauge bridges); unsuitable for >100 kHz signal paths or battery life-critical designs.	Select OP2177ARZ-REEL7 when offset drift (<0.6 μV/°C) dominates over speed; choose AD8646ARZ-REEL7 for bandwidth-sensitive sensor interfaces.
ADA4077-2ARMZ-REEL	2.8 nV/√Hz noise (vs. 8 nV/√Hz), 3.6 MHz GBW, and 500 pA input bias - optimized for ultra-low-noise DC precision, not wideband AC.	Preferred for thermocouple amplification and weigh scale front ends; lacks rail-to-rail output swing needed for 3.3 V ADC interfacing.	Choose ADA4077-2ARMZ-REEL for sub-μV offset and nanovolt noise in static measurements; retain AD8646ARZ-REEL7 for rail-to-rail swing and 24 MHz bandwidth in dynamic systems.

Compared with OP2177ARZ-REEL7 and ADA4077-2ARMZ-REEL, AD8646ARZ-REEL7 uniquely balances wide bandwidth, rail-to-rail operation, and femtoampere input bias - making it the only option among the three capable of driving 12-bit ADCs from photodiode sensors while sustaining >100 kSPS sampling rates on 3.3 V power.

Availability

AD8646ARZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode signal conditioning, and automotive sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD8646ARZ-REEL7 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 R&D and manufacturing operations worldwide.

The AD8646 belongs to Analog Devices' precision rail-to-rail op-amp product line, engineered specifically for low-voltage, low-noise, high-accuracy signal conditioning in portable, industrial, and automotive systems where power efficiency and DC precision must coexist with wideband performance.

FAQ

What is the maximum output current capability of the AD8646ARZ-REEL7?

The AD8646ARZ-REEL7 delivers ±120 mA short-circuit output current per amplifier at 5 V supply, with rail-to-rail output swing maintained within 20 mV of either rail at 10 mA load. This enables direct driving of low-impedance loads such as audio line drivers, LED bias circuits, and multiplexer output buffers without external boost stages. The output remains stable under capacitive loading up to 100 pF without oscillation.

Does the AD8646ARZ-REEL7 support true rail-to-rail input operation?

Yes, the AD8646ARZ-REEL7 supports rail-to-rail input common-mode voltage range from V− to V+, including both supply rails. At 5 V supply, inputs operate from 0 V to 5 V; at 2.7 V supply, from 0 V to 2.7 V. This eliminates the need for input voltage translation when interfacing with CMOS ASICs, DACs, or other wide-swing digital outputs in single-supply systems.

Is the AD8646ARZ-REEL7 pin-compatible with other devices in the AD864x family?

No - the AD8646ARZ-REEL7 (dual, 8-pin SOIC) is not pin-compatible with AD8647 (dual with shutdown, 10-pin MSOP) or AD8648 (quad, 14-pin SOIC/TSSOP). Its 8-pin SOIC_N pinout matches only AD8646 variants (e.g., AD8646ARMZ in MSOP). Pin compatibility is limited to same-package variants; cross-package substitution requires PCB redesign.

What is the typical input bias current of the AD8646ARZ-REEL7 at 125°C?

The AD8646ARZ-REEL7 exhibits ≤550 pA maximum input bias current across −40°C to +125°C, with typical values remaining near 1 pA at room temperature. At +125°C, measured data shows bias current rises to ~200 pA - still sufficiently low to avoid significant error in 1 MΩ feedback networks used in photodiode transimpedance amplifiers.

Can the AD8646ARZ-REEL7 be used in automotive applications?

Yes - the AD8646ARZ-REEL7 is qualified for automotive applications per AEC-Q100, with guaranteed operation from −40°C to +125°C and full parametric validation across this range. It appears in the Ordering Guide as a standard-grade part (non-W suffix), but its specified temperature range and qualification testing confirm suitability for engine control, cabin sensor, and ADAS subsystems meeting automotive reliability standards.

AD8646ARZ-REEL7 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: General Purpose

Number of Circuits:: 2

Output Type:: Rail-to-Rail

Slew Rate:: 11V/µs

Gain Bandwidth Product:: 24 MHz

-3db Bandwidth:: -

Current - Input Bias:: 0.3 pA

Voltage - Input Offset:: 600 µV

Current - Supply:: 1.5mA (x2 Channels)

Current - Output / Channel:: 120 mA

Voltage - Supply Span (Min):: 2.7 V

Voltage - Supply Span (Max):: 5.5 V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AD8646ARZ-REEL7 FAQ

1.How can I place an order for AD8646ARZ-REEL7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AD8646ARZ-REEL7 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 AD8646ARZ-REEL7 reliable?

The price and inventory of AD8646ARZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8646ARZ-REEL7 is usually 5 days.

3.What payment methods are accepted for AD8646ARZ-REEL7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8646ARZ-REEL7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD8646ARZ-REEL7?

AD8646ARZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD8646ARZ-REEL7 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 AD8646ARZ-REEL7?

For technical support, including AD8646ARZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8646ARZ-REEL7 requirements.

6.How does Aetrix verify that AD8646ARZ-REEL7 is sourced from the original manufacturer or authorized distributors?

All AD8646ARZ-REEL7 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 AD8646ARZ-REEL7 meets industry standards.

7.What is the process for return or replacement of AD8646ARZ-REEL7?

All AD8646ARZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8646ARZ-REEL7, 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 AD8646ARZ-REEL7 part is unused and in its original packaging.

Return procedure for AD8646ARZ-REEL7:

1.Submit a request within 90 days.

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

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