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Analog Devices Inc. AD8666ARZ-REEL
- Part No.:
- AD8666ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8666ARZ-REEL.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,844
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Product details
Overview
AD8666ARZ-REEL from Analog Devices is a dual-channel, rail-to-rail output operational amplifier optimized for precision sensor signal conditioning and reference buffering in industrial and automotive systems. It delivers 4 MHz gain bandwidth, 8 nV/√Hz voltage noise at 10 kHz, 2.5 mV max input offset voltage, and operates from single 5 V to 16 V or dual ±2.5 V to ±8 V supplies. Its low 1 pA max input bias current enables high-impedance photodiode amplification.
For engineers reviewing the AD8666ARZ-REEL datasheet, AD8666ARZ-REEL pinout, AD8666ARZ-REEL application, or AD8666ARZ-REEL equivalent, key selection criteria include rail-to-rail output swing under heavy load, −40°C to +125°C extended temperature operation, unity-gain stability with capacitive loads up to 100 pF, and SOIC_N package compatibility with legacy PCB layouts.
Technical Context
The AD8666ARZ-REEL integrates two independent precision op-amps sharing a common supply domain, each featuring JFET-input-stage architecture for ultra-low input bias current and low voltage noise. Its internal compensation ensures stable unity-gain operation without external components across its full 5 V–16 V supply range.
Designed for high-accuracy DC-coupled applications, it maintains CMRR ≥84 dB and PSRR ≥98 dB over temperature while delivering rail-to-rail output swing within 40 mV of either rail at 1 mA load - critical for interfacing with 12-bit+ ADCs and low-voltage microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 4 MHz - supports stable closed-loop gain ≥10 at 400 kHz, suitable for anti-aliasing filters before SAR ADCs. |
| Input Offset Voltage | 2.5 mV max - enables ≤0.1% error in 2.5 V reference buffer applications without trimming. |
| Input Bias Current | 1 pA max - preserves signal integrity in >1 GΩ source impedance circuits like photodiode transimpedance stages. |
| Rail-to-Rail Output Swing | VOL = 40 mV, VOH = 15.96 V @ 16 V supply - delivers full dynamic range to 16-bit DACs and low-dropout regulators. |
| Supply Range | 5 V to 16 V single or ±2.5 V to ±8 V dual - matches industrial 12 V and automotive 12 V battery rails without level-shifting. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and factory-floor industrial environments. |
| Voltage Noise Density | 8 nV/√Hz @ 10 kHz - minimizes broadband noise contribution in audio preamp and physiological measurement front-ends. |
Pinout & Package
AD8666ARZ-REEL is housed in an 8-lead SOIC_N (R-8) package, 5.00 mm × 3.99 mm footprint, 1.5 mm height, RoHS-compliant lead-free finish. Pin 1 marked by notch or bevel.
| 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 Amplifier A - high-impedance node (1 pA bias), sensitive to PCB leakage and guarding. |
| 3 | +IN A | Non-inverting input of Amplifier A - referenced to VCM range of −0.1 V to +14.0 V at 16 V supply. |
| 4 | V− | Negative supply rail - connects to GND (single-supply) or negative rail (dual-supply); decoupling required. |
| 5 | V+ | Positive supply rail - accepts 5 V–16 V; PSRR ≥98 dB rejects supply ripple affecting precision outputs. |
| 6 | +IN B | Non-inverting input of Amplifier B - electrically isolated from Channel A; shares same V+ and V−. |
| 7 | −IN B | Inverting input of Amplifier B - identical bias and noise specs as Pin 2; no crosstalk above −115 dB. |
| 8 | OUT B | Amplifier B output - independently configurable; channel separation ≥115 dB prevents inter-channel interference. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output stage | Drives to within 40 mV of either rail at 1 mA load - eliminates need for level-shifting in 3.3 V/5 V mixed-signal systems. |
| Low input bias current (1 pA max) | Enables accurate amplification of signals from high-Z sources (e.g., pH electrodes, piezoelectric sensors) without gain error. |
| Unity-gain stable | Operates stably with gain = 1 and 100 pF capacitive load - simplifies design of active filters and I/V converters. |
| Extended supply range (5 V–16 V) | Directly interfaces with 12 V industrial buses and automotive batteries without external regulators or charge pumps. |
| −40°C to +125°C operation | Validated performance across full automotive under-hood and industrial control cabinet temperature ranges. |
Applications
| Photodiode Signal Conditioning | Medical ECG Front-End |
|---|---|
|
Use Scenario: Amplifying weak current from silicon photodiodes in optical smoke detectors or pulse oximeters. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with minimal input error. Use Value: 1 pA max input bias current prevents signal loss; 8 nV/√Hz noise preserves SNR in sub-μA current measurements. |
Use Scenario: Buffering and filtering biopotential signals from ECG electrodes prior to 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: High-input-impedance, low-noise instrumentation amplifier stage with DC-coupled gain. Use Value: 2.5 mV max offset avoids baseline drift; rail-to-rail output maximizes ADC utilization without clipping. |
| Industrial Reference Buffer | Automotive Battery Monitoring |
|
Use Scenario: Isolating and driving precision voltage references (e.g., REF5025) to multiple ADCs in PLC modules. IC Role / Device Role / Timing Role: Low-output-impedance unity-gain buffer maintaining reference accuracy under varying load conditions. Use Value: 1.4 mA typical supply current per channel enables low-power designs; PSRR ≥98 dB rejects supply noise. |
Use Scenario: Amplifying cell voltage differences in 12 V lead-acid or Li-ion battery packs for BMS monitoring. IC Role / Device Role / Timing Role: High-common-mode-rejection differential amplifier measuring mV-level cell imbalances. Use Value: CMRR ≥84 dB suppresses common-mode noise from switching regulators; 125°C rating supports engine bay placement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP2177ARZ-REEL | Lower 60 μV max offset, but only 1.3 MHz GBW and 12 V max supply; higher 400 nA input bias. | Better for ultra-precision DC applications (e.g., weigh scales), worse for high-speed filtering or 16 V systems. | Select OP2177ARZ-REEL when offset dominates error budget and speed <1 MHz suffices. |
| LMV358IDR | Higher 7 mV max offset, 1.2 MHz GBW, 5.5 V max supply; 10 nA input bias; lower cost. | Suitable for consumer-grade signal conditioning where 125°C operation and rail-to-rail output are not required. | Select LMV358IDR for cost-sensitive, non-automotive applications with ≤5.5 V supplies and relaxed accuracy. |
Compared with OP2177ARZ-REEL and LMV358IDR, AD8666ARZ-REEL uniquely balances 4 MHz bandwidth, 16 V operation, rail-to-rail output, and 1 pA input bias - making it optimal for high-impedance, wide-supply, high-temperature sensor interfaces where both speed and precision matter.
Availability
AD8666ARZ-REEL is available at Aetrix Electronics and suitable for industrial automation, automotive battery management, and medical diagnostics requiring stable component supply across extended temperature and voltage ranges.
Supply support for AD8666ARZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The AD866x family was designed specifically for precision signal conditioning in harsh-environment applications - emphasizing low input bias current, wide supply range, and guaranteed operation from −40°C to +125°C.
FAQ
What is the maximum supply voltage for AD8666ARZ-REEL?
The AD8666ARZ-REEL supports a maximum supply voltage of 16 V for single-supply operation or ±8 V for dual-supply operation. Absolute maximum rating is 18 V across V+ to V−, but continuous operation above 16 V risks parametric degradation and is not characterized. Always observe derating guidelines per the datasheet's Absolute Maximum Ratings table.
Does AD8666ARZ-REEL support rail-to-rail input?
No, AD8666ARZ-REEL features rail-to-rail *output* only. Its input common-mode voltage range extends from −0.1 V to +14.0 V at 16 V supply, which is beyond the negative rail but does not reach the positive rail. For true rail-to-rail input capability, consider the AD8605/AD8606 family instead.
Is AD8666ARZ-REEL qualified for automotive use?
The standard AD8666ARZ-REEL is not automotive-qualified. Only the AD8666WARZ-R7 and AD8666WARZ-RL variants carry the "W" suffix and are manufactured under AEC-Q100 stress testing with controlled process flow for automotive applications. These automotive models may have different screening, test limits, and reliability reporting.
What is the typical supply current per channel for AD8666ARZ-REEL?
At 25°C and 5 V supply, AD8666ARZ-REEL draws 1.1 mA per amplifier; at 16 V supply, it draws 1.15 mA per amplifier. Over the full −40°C to +125°C range, supply current rises to 2.0 mA per channel maximum. Total device current is double this value since it contains two independent amplifiers.
Can AD8666ARZ-REEL drive capacitive loads without oscillation?
Yes, AD8666ARZ-REEL is unity-gain stable and characterized to drive up to 100 pF capacitive loads without phase reversal or sustained ringing. For loads >100 pF, a small series resistor (10–50 Ω) between output and capacitance is recommended to maintain stability, especially in high-impedance sensor interfaces.
AD8666ARZ-REEL 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:
- 3.5V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 700 µV
- Current - Supply:
- 1.15mA (x2 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:
- 8-SOIC
AD8666ARZ-REEL FAQ
1.How can I place an order for AD8666ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8666ARZ-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 AD8666ARZ-REEL reliable?
The price and inventory of AD8666ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8666ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD8666ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8666ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8666ARZ-REEL?
AD8666ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8666ARZ-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 AD8666ARZ-REEL?
For technical support, including AD8666ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8666ARZ-REEL requirements.
6.How does Aetrix verify that AD8666ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD8666ARZ-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 AD8666ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD8666ARZ-REEL?
All AD8666ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8666ARZ-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 AD8666ARZ-REEL part is unused and in its original packaging.
Return procedure for AD8666ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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