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Analog Devices Inc. AD8666ARZ-REEL7
- Part No.:
- AD8666ARZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8666ARZ-REEL7.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,860
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Product details
Overview
AD8666ARZ-REEL7 from Analog Devices is a dual-channel, rail-to-rail output precision operational amplifier optimized for single-supply operation from 5 V to 16 V (±2.5 V to ±8 V dual). It delivers 4 MHz gain bandwidth, 3.5 V/μs slew rate, 2.5 mV max input offset voltage, and 1 pA max input bias current. It is used in photodiode amplification, ADC driver, and medical physiological measurement circuits requiring low noise and high CMRR.
For engineers reviewing the AD8666ARZ-REEL7 datasheet, AD8666ARZ-REEL7 pinout, AD8666ARZ-REEL7 application, or AD8666ARZ-REEL7 equivalent, key selection criteria include rail-to-rail output swing at 16 V supply, −40°C to +125°C extended industrial temperature rating, low 8 nV/√Hz voltage noise at 10 kHz, unity-gain stability, and SOIC_N (R-8) package compatibility with standard PCB layouts.
Technical Context
The AD8666ARZ-REEL7 implements a precision bipolar-input op amp architecture with rail-to-rail output stage enabling full-swing signal conditioning across its 5 V–16 V supply range. Its low input bias current (≤1 pA) and low input voltage noise (8 nV/√Hz @ 10 kHz) support high-impedance sensor interfaces without significant DC error or signal degradation.
It features 100 dB typical CMRR and 115 dB PSRR at 25°C, ensuring robust performance in noisy industrial environments. The device is unity-gain stable and exhibits 70° phase margin, supporting reliable closed-loop operation in filter, buffer, and level-shifting configurations without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 4 MHz - supports stable amplification of signals up to ~2.5 MHz at unity gain with <1% gain error. |
| Slew Rate | 3.5 V/μs - enables clean 10 Vpp output at 500 kHz without slewing distortion. |
| Input Offset Voltage | 2.5 mV max - introduces ≤0.025% error in 10 V full-scale systems; specified over −40°C to +125°C. |
| Input Bias Current | 1 pA max - minimizes voltage error across >1 GΩ source impedances (e.g., photodiodes). |
| Supply Range | 5 V to 16 V single supply (or ±2.5 V to ±8 V dual) - matches high-voltage ADCs/DACs and industrial sensors. |
| Output Swing | Rail-to-rail - delivers ≥0.04 V from rails at 1 mA load, preserving dynamic range in low-voltage systems. |
| Voltage Noise Density | 8 nV/√Hz @ 10 kHz - ensures SNR > 90 dB for 1 kHz–10 kHz biomedical signal bands. |
Pinout & Package
AD8666ARZ-REEL7 is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch, 5.00 mm × 3.99 mm body, and 1.75 mm height. Thermal resistance θJA = 158°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to ±140 mA short-circuit current; rail-to-rail capable. |
| 2 | −IN A | Inverting input of Amplifier A - high-impedance node (1 pA bias); connects to feedback network. |
| 3 | +IN A | Non-inverting input of Amplifier A - accepts common-mode voltages from −0.1 V to VDD − 2 V. |
| 4 | V− | Negative supply pin - tied to ground in single-supply mode; supports dual-supply operation down to −8 V. |
| 5 | V+ | Positive supply pin - accepts 5 V to 16 V; powers both amplifiers and internal bias circuitry. |
| 6 | +IN B | Non-inverting input of Amplifier B - electrically isolated from Channel A; identical specs and layout symmetry. |
| 7 | −IN B | Inverting input of Amplifier B - matched to Pin 2; enables dual-channel instrumentation or differential pair use. |
| 8 | OUT B | Amplifier B output - independent channel with same drive capability and rail-to-rail swing as OUT A. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers 0.04 V from supply rails at 1 mA load, maximizing usable dynamic range in 5 V–16 V systems. |
| Low input bias current (1 pA max) | Enables accurate amplification of nanoamp-level photodiode or pH electrode currents without significant offset drift. |
| Extended supply range (5 V–16 V) | Directly interfaces with 12-bit/16-bit SAR ADCs (e.g., AD7980, AD7685) and high-voltage DACs without level-shifting. |
| Low 1/f noise (2.5 μV p-p, 0.1–10 Hz) | Supports stable DC-coupled physiological measurements (ECG, EEG) without observable popcorn or flicker artifacts. |
| −40°C to +125°C operation | Qualified for under-hood automotive and industrial control applications where ambient temperature exceeds 85°C. |
Applications
| Photodiode Amplification | ADC Driver |
|---|---|
|
Use Scenario: Converting weak current from silicon photodiodes in optical smoke detectors or spectrophotometers into precise voltage signals. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with low input bias current and low noise to preserve signal integrity at sub-nA levels. Use Value: 1 pA max input bias current prevents saturation of high-gain TIA configurations; 8 nV/√Hz noise ensures >70 dB SNR for 100 nA–10 μA photocurrents. |
Use Scenario: Driving the input of a 16-bit SAR ADC (e.g., AD7685) in data acquisition systems requiring full-scale accuracy. IC Role / Device Role / Timing Role: Buffer and level shifter between sensor front-end and ADC reference domain, maintaining settling time <1 μs. Use Value: 4 MHz GBW and 3.5 V/μs slew rate enable full-scale step response within 0.5 LSB error; rail-to-rail output avoids clipping near supply rails. |
| Medical Physiological Measurement | Reference Buffer |
|
Use Scenario: Amplifying low-amplitude bioelectric signals (e.g., ECG leads) in portable patient monitors with battery-powered 5 V supplies. IC Role / Device Role / Timing Role: Instrumentation-grade signal conditioner with high CMRR and low DC drift for DC-coupled biopotential acquisition. Use Value: 100 dB CMRR rejects 50/60 Hz mains interference; 2.5 mV max VOS and 10 μV/°C drift ensure baseline stability over clinical operating temperatures. |
Use Scenario: Buffering precision voltage references (e.g., REF5025) to multiple analog subsystems in test equipment without loading error. IC Role / Device Role / Timing Role: Low-output-impedance unity-gain follower isolating reference from variable downstream loads. Use Value: Closed-loop output impedance of 50 Ω at 1 MHz maintains reference accuracy under 100 pF capacitive loads; rail-to-rail swing preserves full 2.5 V reference range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP2177ARZ-REEL7 | Lower offset (25 μV typ), lower noise (3.5 nV/√Hz), but narrower supply (±15 V max), no rail-to-rail output. | Better for ultra-precision DC-coupled instrumentation; unsuitable for 5 V single-supply or rail-swing-critical designs. | Select OP2177ARZ-REEL7 when sub-100 μV offset dominates requirements and supply allows ±15 V operation. |
| ADA4077-2ARZ-REEL7 | Lower offset (10 μV max), lower bias current (0.3 pA), but slower (1.7 MHz GBW), higher supply current (0.9 mA/ch). | Preferred for ultra-low-drift sensor front-ends where bandwidth <1 MHz suffices; less suitable for fast ADC driving. | Select ADA4077-2ARZ-REEL7 for high-impedance, low-frequency applications demanding <15 μV drift over temperature. |
Compared with OP2177ARZ-REEL7 and ADA4077-2ARZ-REEL7, AD8666ARZ-REEL7 uniquely balances rail-to-rail output, 4 MHz bandwidth, and 1 pA bias in a 16 V-capable SOIC package-making it optimal for cost-sensitive, wide-supply industrial and medical signal chains where full dynamic range utilization is critical.
Availability
AD8666ARZ-REEL7 is available at Aetrix Electronics and suitable for photodiode amplification, ADC driver, and medical physiological measurement applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8666ARZ-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.
The AD866x family was designed specifically for precision signal conditioning in cost-sensitive industrial, medical, and automotive systems requiring rail-to-rail output, wide supply range, and low input bias current-without sacrificing bandwidth or noise performance.
FAQ
What is the maximum supply voltage for AD8666ARZ-REEL7?
The absolute maximum supply voltage for AD8666ARZ-REEL7 is 18 V, but the recommended operating range is 5 V to 16 V for single-supply use (or ±2.5 V to ±8 V dual-supply). Operation at 16 V enables full rail-to-rail output swing and matches high-voltage data converters. Exceeding 18 V risks permanent damage per Absolute Maximum Ratings Table 3.
Is AD8666ARZ-REEL7 suitable for photodiode transimpedance amplifier (TIA) applications?
Yes, AD8666ARZ-REEL7 is well-suited for TIA applications due to its 1 pA max input bias current, 8 nV/√Hz voltage noise at 10 kHz, and 4 MHz gain bandwidth. These parameters minimize DC error and preserve SNR when amplifying nanoamp-level photocurrents. Its rail-to-rail output also supports wide dynamic range in single-supply optical sensing systems.
Does AD8666ARZ-REEL7 have automotive qualification?
No, AD8666ARZ-REEL7 is the commercial-grade version. Automotive-qualified variants are designated AD8666WARZ-R7 and AD8666WARZ-RL, which undergo controlled manufacturing and additional reliability testing per AEC-Q100. AD8666ARZ-REEL7 operates over −40°C to +125°C but lacks automotive-specific qualification documentation.
What is the typical input offset voltage drift of AD8666ARZ-REEL7 over temperature?
The typical input offset voltage drift of AD8666ARZ-REEL7 is 3.0 μV/°C, with a maximum of 10 μV/°C over the full −40°C to +125°C operating range (per Table 1 and Table 2). This low drift ensures stable DC accuracy in temperature-varying environments such as industrial control cabinets or portable medical devices.
Can AD8666ARZ-REEL7 drive heavy capacitive loads without instability?
AD8666ARZ-REEL7 is unity-gain stable but exhibits increasing overshoot with capacitive loads >100 pF (Figure 21). For loads >200 pF, external isolation resistor (e.g., 10–50 Ω in series with output) is recommended. Its 70° phase margin at 5 V and 73° at 16 V provides robust stability in standard unity-gain buffer configurations with ≤100 pF load.
AD8666ARZ-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:
- 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-REEL7 FAQ
1.How can I place an order for AD8666ARZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8666ARZ-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 AD8666ARZ-REEL7 reliable?
The price and inventory of AD8666ARZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8666ARZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD8666ARZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8666ARZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8666ARZ-REEL7?
AD8666ARZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8666ARZ-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 AD8666ARZ-REEL7?
For technical support, including AD8666ARZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8666ARZ-REEL7 requirements.
6.How does Aetrix verify that AD8666ARZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD8666ARZ-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 AD8666ARZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD8666ARZ-REEL7?
All AD8666ARZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8666ARZ-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 AD8666ARZ-REEL7 part is unused and in its original packaging.
Return procedure for AD8666ARZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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