Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Analog Devices Inc. AD8668ARUZ

Name: AD8668ARUZ
Brand: Analog Devices Inc.
SKU: AD8668ARUZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AD8668ARUZ

Manufacturer:: Analog Devices Inc.

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: AD8668ARUZ.pdf

Description:: IC OPAMP GP 4 CIRCUIT 14TSSOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:731

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AD8668ARUZ from Analog Devices is a quad, rail-to-rail output, precision operational amplifier optimized for single-supply operation from 5 V to 16 V. It delivers 4 MHz gain bandwidth, 3.5 V/µs slew rate, 2.5 mV max offset voltage, 1 pA max input bias current, and 8 nV/√Hz voltage noise at 10 kHz - enabling high-fidelity signal conditioning in photodiode amplification and medical physiological measurement circuits.

For engineers reviewing the AD8668ARUZ datasheet, AD8668ARUZ pinout, AD8668ARUZ application, or AD8668ARUZ equivalent, key selection considerations include its 14-lead TSSOP (RU-14) package, −40°C to +125°C automotive-grade temperature range, rail-to-rail output swing, low-noise performance at high source impedances, and guaranteed unity-gain stability without external compensation.

Technical Context

The AD8668ARUZ implements a CMOS input stage with JFET-like input bias current performance (≤1 pA), enabling accurate amplification of ultra-high-impedance sensor signals. Its rail-to-rail output stage supports full dynamic range utilization across 5 V to 16 V supplies, while internal compensation ensures stable unity-gain operation with ≤50 Ω closed-loop output impedance at 1 MHz.

Designed for extended industrial and automotive environments, the device maintains 70°–73° phase margin across supply voltages (5 V–16 V) and temperature (−40°C to +125°C), with channel separation of −115 dB at 10 kHz and no output phase reversal under common-mode overdrive conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain Bandwidth Product	4 MHz - supports stable closed-loop gain ≥1 with ≤1% gain error up to 100 kHz for 40× amplification of fast sensor signals.
Input Bias Current	1 pA max - enables use with >1 GΩ source impedances (e.g., photodiodes, pH electrodes) without significant DC error.
Offset Voltage	2.5 mV max - limits initial DC error to <0.1% of full-scale in 2.5 V reference buffer applications.
Rail-to-Rail Output	Swings within 40 mV of rails at 1 mA load - preserves >98% of available output voltage headroom in 5 V systems.
Supply Range	5 V to 16 V single supply (±2.5 V to ±8 V dual) - matches high-voltage ADCs/DACs and automotive 12 V battery-referenced designs.
Voltage Noise Density	8 nV/√Hz @ 10 kHz - ensures <1 µV RMS integrated noise in 10 kHz bandwidth, critical for low-level physiological signal amplification.
Operating Temperature	−40°C to +125°C - qualified for under-hood automotive and industrial embedded control applications without derating.

Pinout & Package

AD8668ARUZ is housed in a 14-lead TSSOP package (RU-14), 5.00 mm × 4.40 mm × 1.20 mm body, RoHS-compliant, with exposed pad not electrically connected.

Pin/Terminal	Circuit Role	Design Meaning
1	OUT A	Amplifier A output - drives low-impedance loads up to ±140 mA short-circuit current; rail-to-rail swing.
2	–IN A	Inverting input of Amp A - high-impedance node (1 pA bias); connects to feedback network or sensor return path.
3	+IN A	Non-inverting input of Amp A - accepts common-mode voltage from −0.1 V to +14.0 V on 16 V supply.
4	V–	Negative supply rail - referenced to system ground in single-supply mode; must be decoupled with 0.1 µF ceramic capacitor.
5	+IN D	Non-inverting input of Amp D - independent high-Z input for fourth channel; shares same CMRR and noise specs as Amp A.
6	–IN D	Inverting input of Amp D - matched to other inputs for quad-channel common-mode rejection.
7	OUT D	Amplifier D output - identical AC/DC performance to OUT A; supports independent signal paths in multi-channel systems.
8	V+	Positive supply rail - accepts 5 V–16 V; PSRR of 98–115 dB rejects supply ripple affecting precision DC gain.
9	OUT C	Amplifier C output - enables simultaneous processing of four analog channels without inter-channel crosstalk (>115 dB isolation).
10	–IN C	Inverting input of Amp C - low-input-bias-current node for high-accuracy transimpedance configurations.
11	+IN C	Non-inverting input of Amp C - supports level-shifting and differential sensing with matched input characteristics.
12	V–	Shared negative rail - all four amplifiers reference same V–; requires low-impedance grounding for optimal PSRR.
13	+IN B	Non-inverting input of Amp B - identical electrical specs to +IN A; enables synchronous multi-sensor acquisition.
14	OUT B	Amplifier B output - fully independent output stage; no shared internal nodes with other amplifiers.

Key Features

Feature	Design Value
Rail-to-rail output swing	Delivers 4.93 V high and 85 mV low on 5 V supply - maximizes ADC input range without level-shifting circuitry.
Low input bias current (1 pA max)	Reduces voltage error to <1 mV with 1 GΩ photodiode leakage - essential for stable transimpedance gain.
Unity-gain stable	Operates with no external compensation in follower or gain-of-1 configurations - simplifies layout and reduces BOM count.
Automotive-qualified temperature range	Guaranteed operation from −40°C to +125°C - meets AEC-Q100 stress test requirements for engine control modules.
No output phase reversal	Prevents latch-up or uncontrolled saturation during input overdrive - critical for safety-critical medical monitoring front-ends.

Applications

Photodiode Amplification	Medical Physiological Measurement
Use Scenario: Converting weak current from silicon photodiodes (e.g., pulse oximetry, spectrophotometry) into precise voltage signals. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current and low noise to preserve signal integrity at sub-nA levels. Use Value: 1 pA input bias minimizes dark-current-induced offset; 8 nV/√Hz noise ensures >70 dB SNR in 10 kHz bandwidth for clean optical waveform capture.	Use Scenario: Amplifying low-amplitude bioelectric signals (ECG, EEG, EMG) with high common-mode rejection and minimal distortion. IC Role / Device Role / Timing Role: Instrumentation-grade front-end amplifier providing rail-to-rail output swing and 110 dB CMRR at DC for differential electrode inputs. Use Value: 2.5 mV max offset and 3.0 μV/°C drift maintain baseline stability across patient temperature variations; −115 dB channel separation prevents cross-talk between multi-lead recordings.
Reference Buffer	ADC Driver
Use Scenario: Isolating and buffering precision voltage references (e.g., 2.5 V, 4.096 V) for SAR and delta-sigma ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Low-output-impedance unity-gain buffer with high PSRR to reject supply noise coupling into reference rails. Use Value: 115 dB PSRR and 50 Ω closed-loop output impedance ensure <1 LSB error in 16-bit ADCs even with noisy digital supplies.	Use Scenario: Driving the switched-capacitor input of high-speed SAR ADCs (e.g., 1 MSPS) with minimal settling error and distortion. IC Role / Device Role / Timing Role: High-slew-rate (3.5 V/µs), low-distortion driver maintaining linearity during full-scale transitions. Use Value: 4 MHz bandwidth and 70° phase margin guarantee <0.01% settling in <500 ns to 12-bit accuracy - eliminating need for external RC snubbing networks.

Photodiode Amplification

Medical Physiological Measurement

Use Scenario: Converting weak current from silicon photodiodes (e.g., pulse oximetry, spectrophotometry) into precise voltage signals.

IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current and low noise to preserve signal integrity at sub-nA levels.

Use Value: 1 pA input bias minimizes dark-current-induced offset; 8 nV/√Hz noise ensures >70 dB SNR in 10 kHz bandwidth for clean optical waveform capture.

Use Scenario: Amplifying low-amplitude bioelectric signals (ECG, EEG, EMG) with high common-mode rejection and minimal distortion.

IC Role / Device Role / Timing Role: Instrumentation-grade front-end amplifier providing rail-to-rail output swing and 110 dB CMRR at DC for differential electrode inputs.

Use Value: 2.5 mV max offset and 3.0 μV/°C drift maintain baseline stability across patient temperature variations; −115 dB channel separation prevents cross-talk between multi-lead recordings.

Reference Buffer

ADC Driver

Use Scenario: Isolating and buffering precision voltage references (e.g., 2.5 V, 4.096 V) for SAR and delta-sigma ADCs in data acquisition systems.

IC Role / Device Role / Timing Role: Low-output-impedance unity-gain buffer with high PSRR to reject supply noise coupling into reference rails.

Use Value: 115 dB PSRR and 50 Ω closed-loop output impedance ensure <1 LSB error in 16-bit ADCs even with noisy digital supplies.

Use Scenario: Driving the switched-capacitor input of high-speed SAR ADCs (e.g., 1 MSPS) with minimal settling error and distortion.

IC Role / Device Role / Timing Role: High-slew-rate (3.5 V/µs), low-distortion driver maintaining linearity during full-scale transitions.

Use Value: 4 MHz bandwidth and 70° phase margin guarantee <0.01% settling in <500 ns to 12-bit accuracy - eliminating need for external RC snubbing networks.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD8668ARZ	Same die, 14-lead SOIC_N (R-14) package; 120°C/W θJA vs. 180°C/W for RU-14; 8.75 mm × 4.00 mm footprint.	Preferred for through-hole prototyping or higher-power thermal dissipation; less space-constrained than TSSOP.	Select AD8668ARZ when board real estate allows larger package and thermal management prioritizes lower junction rise.
OP497GPZ	Lower bandwidth (500 kHz), higher offset (150 µV typ), but lower input bias (0.5 pA typ); dual supply only (±2 V to ±20 V).	Better for ultra-high-impedance DC-coupled sensors where speed is secondary; not suitable for 5 V single-supply systems.	Choose OP497GPZ only for sub-Hz applications requiring femtoampere-level bias current, not for AD8668ARUZ's 4 MHz signal bandwidth use cases.

Compared with AD8668ARZ, AD8668ARUZ offers 30% smaller PCB area and better high-frequency PSRR but requires tighter thermal design; versus OP497GPZ, it trades ultra-low bias current for 8× higher bandwidth and single-supply flexibility - making it superior for mixed-signal data acquisition and automotive sensor interfaces.

Availability

AD8668ARUZ is available at Aetrix Electronics and suitable for photodiode amplification, medical physiological measurement, and ADC driver applications requiring stable component supply across automotive and industrial temperature ranges.

Supply support for AD8668ARUZ 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 AD866x family was designed specifically for cost-sensitive, high-precision analog signal conditioning in automotive, medical, and industrial systems where rail-to-rail output, low noise, and wide supply range are mandatory.

FAQ

What is the maximum supply voltage rating for AD8668ARUZ?

The AD8668ARUZ has an absolute maximum supply voltage of 18 V, with recommended operating range from 5 V to 16 V for single-supply use. Exceeding 18 V risks permanent damage per Absolute Maximum Ratings Table 3. Operation at 16 V is fully characterized across temperature and ensures specified performance including 15.96 V output high swing and 110 dB CMRR.

Does AD8668ARUZ support true rail-to-rail input operation?

No, AD8668ARUZ features rail-to-rail *output* only. Its input common-mode voltage range extends from −0.1 V to VDD − 1.5 V (e.g., −0.1 V to +14.0 V on 16 V supply), as specified in Tables 1 and 2. It does not accept inputs at the positive rail, distinguishing it from full rail-to-rail input/output amplifiers.

Is AD8668ARUZ pin-compatible with other AD866x variants like AD8666 or AD8665?

No - AD8668ARUZ is a quad amplifier in 14-lead TSSOP, while AD8666 is dual (8-lead SOIC/MSOP) and AD8665 is single (5- or 8-lead). Pinouts differ fundamentally: AD8668ARUZ has dedicated V+ and V– pins for all four amplifiers, whereas AD8666 shares supply pins across two channels but uses different pin numbering and terminal assignments.

What is the typical supply current per amplifier for AD8668ARUZ at 25°C and 5 V supply?

At 25°C and 5 V supply, the typical supply current per amplifier for AD8668ARUZ is 1.25 mA (1.1–1.4 mA min–max), as shown in Table 1. Total quiescent current for all four amplifiers is therefore ~5 mA, enabling low-power operation in battery-backed medical or portable instrumentation.

Can AD8668ARUZ drive capacitive loads without instability?

AD8668ARUZ is unity-gain stable but exhibits increasing overshoot with capacitive loads: Figure 21 shows ≤10% overshoot at 100 pF and ≤70% at 1000 pF on 16 V supply. For loads >100 pF, a series resistor (≥100 Ω) between output and capacitance is recommended to maintain phase margin above 70° and prevent ringing in ADC driver or filter applications.

AD8668ARUZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Active

Amplifier Type:: General Purpose

Number of Circuits:: 4

Output Type:: Rail-to-Rail

Slew Rate:: 3.5V/µs

Gain Bandwidth Product:: 4 MHz

-3db Bandwidth:: -

Current - Input Bias:: 0.2 pA

Voltage - Input Offset:: 600 µV

Current - Supply:: 1.15mA (x4 Channels)

Current - Output / Channel:: 140 mA

Voltage - Supply Span (Min):: 5 V

Voltage - Supply Span (Max):: 16 V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

AD8668ARUZ FAQ

1.How can I place an order for AD8668ARUZ through Aetrix?

Please submit a Request for Quotation (RFQ) for AD8668ARUZ 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 AD8668ARUZ reliable?

The price and inventory of AD8668ARUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8668ARUZ is usually 5 days.

3.What payment methods are accepted for AD8668ARUZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8668ARUZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD8668ARUZ?

AD8668ARUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD8668ARUZ 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 AD8668ARUZ?

For technical support, including AD8668ARUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8668ARUZ requirements.

6.How does Aetrix verify that AD8668ARUZ is sourced from the original manufacturer or authorized distributors?

All AD8668ARUZ 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 AD8668ARUZ meets industry standards.

7.What is the process for return or replacement of AD8668ARUZ?

All AD8668ARUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8668ARUZ, 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 AD8668ARUZ part is unused and in its original packaging.

Return procedure for AD8668ARUZ:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…