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Analog Devices Inc. AD8666WARZ-R7
- Part No.:
- AD8666WARZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8666WARZ-R7.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,763
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Product details
Overview
AD8666WARZ-R7 from Analog Devices is a dual-channel, rail-to-rail output, precision operational amplifier optimized for 5 V to 16 V single-supply or ±2.5 V to ±8 V dual-supply operation. 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 density at 10 kHz - enabling high-fidelity signal conditioning in photodiode amplification and medical sensor front-ends.
For engineers reviewing the AD8666WARZ-R7 datasheet, AD8666WARZ-R7 pinout, AD8666WARZ-R7 application, or AD8666WARZ-R7 equivalent, this page provides verified technical context, package-specific pin mapping, real-world application cards, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The AD8666WARZ-R7 implements a bipolar input stage with rail-to-rail output swing, supporting common-mode input range from −0.1 V to VDD − 2 V (e.g., −0.1 V to +14.0 V at 16 V supply) and delivering rail-to-rail output drive into 2 kΩ loads. Its unity-gain stable architecture achieves 70°–73° phase margin across supply voltages and temperature (−40°C to +125°C), with no output phase reversal under overload conditions.
It operates across extended industrial and automotive temperature ranges (−40°C to +125°C), features low 1.15–1.55 mA per amplifier supply current, and maintains <50 mV low-side and <160 mV high-side output saturation voltage at 1 mA load - critical for precision level-shifting and ADC driver stages where headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 4 MHz - supports stable closed-loop operation up to 100 kHz with ≥40 dB gain while preserving phase margin. |
| Input Bias Current | 1 pA max - enables accurate amplification of high-impedance sources like photodiodes without significant DC error. |
| Offset Voltage | 2.5 mV max - ensures ≤0.5% full-scale error in 500 mV-span sensor interfaces at room temperature. |
| Rail-to-Rail Output | VOH ≥15.94 V / VOL ≤40 mV at 16 V supply - delivers >99.7% output swing, minimizing dynamic range loss in single-supply systems. |
| Supply Range | 5 V to 16 V single-supply - directly interfaces with 12 V and 15 V industrial rails and matches voltage ranges of high-performance SAR ADCs. |
| Voltage Noise Density | 8 nV/√Hz @ 10 kHz - preserves SNR in audio preamps and physiological measurement chains above 1 kHz. |
| Channel Separation | −115 dB @ 10 kHz - prevents crosstalk between dual channels in simultaneous-sampling sensor arrays or stereo audio paths. |
Pinout & Package
AD8666WARZ-R7 is packaged in an 8-lead SOIC_N (R-8) with standard JEDEC MS-012-AA footprint (5.00 mm × 4.00 mm × 1.50 mm height). Pin 1 is marked by a beveled corner or dot; device is RoHS-compliant and qualified for automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to ±140 mA short-circuit current; rail-to-rail swing supports direct connection to SAR ADC inputs. |
| 2 | −IN A | Inverting input of Amplifier A - high-impedance node (1 pA bias) suitable for precision feedback networks and transimpedance configurations. |
| 3 | +IN A | Non-inverting input of Amplifier A - accepts common-mode signals from −0.1 V to VDD − 2 V; used for reference buffering and sensor excitation. |
| 4 | V− | Negative supply rail - tied to GND in single-supply mode; must be decoupled with 0.1 μF ceramic capacitor near pin. |
| 5 | V+ | Positive supply rail - accepts 5 V to 16 V; PSRR of 98–115 dB suppresses supply ripple in noisy industrial environments. |
| 6 | +IN B | Non-inverting input of Amplifier B - electrically isolated from Channel A; enables independent dual-path signal conditioning. |
| 7 | −IN B | Inverting input of Amplifier B - matched input characteristics to Channel A; supports differential pair configurations with external resistors. |
| 8 | OUT B | Amplifier B output - identical performance to OUT A; allows simultaneous processing of two analog channels without cross-talk degradation. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers ≥99.7% of supply rail span at 1 mA load - eliminates need for level-shifting circuitry in 12 V or 15 V systems. |
| Low input bias current (1 pA max) | Reduces voltage error to <10 μV in 10 MΩ source impedance circuits - essential for photodiode and pH electrode interfaces. |
| Automotive qualification (AEC-Q100 Grade 2) | Validated for −40°C to +125°C operation with enhanced process controls - meets reliability requirements for engine control and ADAS sensor modules. |
| No output phase reversal | Prevents latch-up or uncontrolled output behavior during input overdrive - critical for safety-critical medical and automotive monitoring loops. |
| Low 1/f noise (2.4 μV p-p, 0.1–10 Hz) | Minimizes baseline drift in ECG and EEG amplifiers where sub-Hz signal fidelity determines diagnostic accuracy. |
Applications
| Photodiode Signal Amplification | Medical Physiological Monitoring |
|---|---|
Use Scenario: Converting weak current from silicon photodiodes in pulse oximeters or environmental light sensors into stable voltage outputs. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) front-end with ultra-low input bias current and low noise to preserve signal integrity. Use Value: 1 pA max input bias current prevents photocurrent loss; 8 nV/√Hz noise density maintains >70 dB SNR at 10 kHz detection frequencies. |
Use Scenario: Amplifying microvolt-level bioelectric signals (e.g., ECG, EMG) in portable patient monitors and wearable diagnostics. IC Role / Device Role / Timing Role: Precision instrumentation amplifier input stage with rail-to-rail output driving 16-bit SAR ADCs. Use Value: 2.5 mV max offset voltage limits baseline error to <0.5% of 500 mV full-scale; −115 dB channel separation prevents inter-lead crosstalk. |
| Industrial Reference Buffering | Audio Line-Level Pre-amplification |
Use Scenario: Buffering precision voltage references (e.g., REF5025) in PLC analog I/O modules and data acquisition systems. IC Role / Device Role / Timing Role: Unity-gain stable buffer isolating reference from load variations while maintaining low drift. Use Value: 3.0 μV/°C max offset drift ensures <15 μV total drift over −40°C to +85°C; 110 dB CMRR rejects common-mode noise on shared PCB ground planes. |
Use Scenario: Low-noise pre-amplification of line-level audio signals in automotive infotainment head units and studio-grade mixers. IC Role / Device Role / Timing Role: Dual-channel op-amp providing gain, filtering, and output drive for balanced/unbalanced audio paths. Use Value: 8 nV/√Hz noise density preserves wide dynamic range; rail-to-rail output supports 2 VPP signal swing into 10 kΩ loads without clipping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision dual op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8666ARZ | Same die, non-automotive grade; specified only for −40°C to +125°C but lacks AEC-Q100 qualification and automotive process controls. | Not approved for automotive safety-critical systems; suitable for industrial and consumer equipment with less stringent reliability requirements. | Select AD8666ARZ when automotive qualification is unnecessary and cost sensitivity outweighs long-term field reliability needs. |
| OPA2333AIDR | Zero-drift architecture; 0.02 μV/°C offset drift vs. AD8666WARZ-R7's 3.0 μV/°C; higher 350 nA input bias current vs. 1 pA. | Better DC stability in temperature-varying environments; unsuitable for high-Z photodiode or pH electrode interfaces due to elevated bias current. | Choose OPA2333AIDR for ultra-low drift in battery-powered sensor nodes where input impedance >100 kΩ is acceptable. |
Compared with AD8666ARZ, AD8666WARZ-R7 adds automotive qualification and tighter process controls without sacrificing AC performance; compared with OPA2333AIDR, it trades zero-drift precision for femtoampere input bias current - making it superior for high-impedance, medium-bandwidth sensor front-ends.
Availability
AD8666WARZ-R7 is available at Aetrix Electronics and suitable for automotive ADAS sensor modules, industrial PLC analog I/O, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8666WARZ-R7 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 Wilmington, MA, with design centers worldwide.
The AD866x family was engineered for cost-sensitive, high-accuracy analog signal conditioning in automotive, medical, and industrial systems - emphasizing rail-to-rail output, low noise, and extended supply voltage range without JFET-level cost.
FAQ
What is the operating temperature range for AD8666WARZ-R7?
The AD8666WARZ-R7 is rated for −40°C to +125°C operation and qualified to AEC-Q100 Grade 2 standards. This range is validated across all electrical parameters including offset voltage, bias current, and gain bandwidth - ensuring reliable performance in under-hood automotive environments and industrial enclosures without forced cooling.
Does AD8666WARZ-R7 support single-supply operation?
Yes, AD8666WARZ-R7 supports true single-supply operation from 5 V to 16 V. Its input common-mode range extends to −0.1 V and its rail-to-rail output delivers VOH ≥15.94 V and VOL ≤40 mV at 16 V supply - enabling direct interfacing with 12 V and 15 V systems without level-shifting components.
Is AD8666WARZ-R7 pin-compatible with AD8666ARZ?
Yes, AD8666WARZ-R7 and AD8666ARZ share identical 8-lead SOIC_N (R-8) packaging, pinout, and electrical functionality. The only distinction is automotive qualification: AD8666WARZ-R7 undergoes additional process controls and testing per AEC-Q100, while AD8666ARZ is intended for commercial/industrial use.
What is the maximum load current AD8666WARZ-R7 can drive?
AD8666WARZ-R7 delivers ±140 mA short-circuit output current per amplifier. In linear operation, it sustains 1 mA load with VOL ≤40 mV and VOH ≥15.94 V at 16 V supply - sufficient to drive ADC reference inputs, LED drivers, and moderate-impedance filters without external buffers.
Can AD8666WARZ-R7 be used in photodiode transimpedance applications?
Yes, AD8666WARZ-R7 is well-suited for photodiode TIA designs due to its 1 pA max input bias current, 8 nV/√Hz voltage noise at 10 kHz, and 4 MHz bandwidth. These specs minimize dark-current error and preserve signal-to-noise ratio in low-light detection systems such as smoke detectors and spectrophotometers.
AD8666WARZ-R7 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:
- 600 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
AD8666WARZ-R7 FAQ
1.How can I place an order for AD8666WARZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8666WARZ-R7 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 AD8666WARZ-R7 reliable?
The price and inventory of AD8666WARZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8666WARZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8666WARZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8666WARZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8666WARZ-R7?
AD8666WARZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8666WARZ-R7 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 AD8666WARZ-R7?
For technical support, including AD8666WARZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8666WARZ-R7 requirements.
6.How does Aetrix verify that AD8666WARZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8666WARZ-R7 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 AD8666WARZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8666WARZ-R7?
All AD8666WARZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8666WARZ-R7, 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 AD8666WARZ-R7 part is unused and in its original packaging.
Return procedure for AD8666WARZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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