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Analog Devices Inc. AD8666ARMZ
- Part No.:
- AD8666ARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8666ARMZ.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:963
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Product details
Overview
AD8666ARMZ 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 ±2.5 V to ±8 V or single 5 V to 16 V supplies. Its low 1 pA max input bias current enables high-impedance photodiode and medical electrode interfaces.
For engineers reviewing the AD8666ARMZ datasheet, AD8666ARMZ pinout, AD8666ARMZ application, or AD8666ARMZ equivalent, this page provides verified specifications, package-specific terminal mapping, real-world use cases, and validated alternative options for cost-sensitive, high-reliability analog signal chains requiring stable DC accuracy and wide supply range.
Technical Context
The AD8666ARMZ employs a proprietary bipolar input stage delivering ultra-low input bias current (≤1 pA) while maintaining rail-to-rail output swing and unity-gain stability across its full 5 V–16 V supply range. Its architecture supports true single-supply operation with input common-mode range extending 0.1 V below ground and up to 14 V with 16 V supply.
It features matched dual amplifiers on a monolithic die with −115 dB channel separation at 10 kHz, enabling precise differential signal processing without crosstalk-induced error. The device is specified over −40°C to +125°C and qualified for automotive applications in W-grade variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 4 MHz - Enables stable closed-loop operation up to 100 kHz with gain ≥40, suitable for anti-aliasing and active filter stages. |
| Input Offset Voltage | 2.5 mV max - Ensures ≤0.025% full-scale error in 10 V-range sensor interfaces without trimming. |
| Input Bias Current | 1 pA max - Allows direct connection to >1 GΩ source impedances (e.g., pH electrodes, piezoresistive sensors) without significant offset drift. |
| Voltage Noise Density | 8 nV/√Hz @ 10 kHz - Supports low-noise amplification of audio-band and physiological signals without dominant thermal noise contribution. |
| Supply Range | ±2.5 V to ±8 V or 5 V to 16 V - Matches industrial ADCs/DACs (e.g., AD7689, AD5758) and eliminates need for level-shifting circuitry. |
| Rail-to-Rail Output | VOH = 15.94 V, VOL = 40 mV @ 16 V - Delivers >99.7% output swing, maximizing dynamic range in single-supply data acquisition systems. |
| Operating Temperature | −40°C to +125°C - Validated for under-hood automotive and industrial control cabinet deployment without derating. |
Pinout & Package
AD8666ARMZ is housed in an 8-lead MSOP (RM-8) package measuring 3.0 mm × 3.0 mm × 0.85 mm, with exposed pad for thermal enhancement and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - Drives loads up to 1 mA with <40 mV saturation voltage at 16 V supply. |
| 2 | −IN A | Inverting input of Amplifier A - High-impedance node (1 pA bias) for feedback network attachment. |
| 3 | +IN A | Non-inverting input of Amplifier A - Accepts common-mode voltages from −0.1 V to +14.0 V at 16 V supply. |
| 4 | V− | Negative supply rail - Connects to ground (single-supply) or negative rail (dual-supply); must be decoupled with 0.1 µF ceramic capacitor. |
| 5 | V+ | Positive supply rail - Supports 5 V–16 V operation; PSRR >98 dB minimizes supply ripple coupling into output. |
| 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 to Channel A for differential gain accuracy and common-mode rejection. |
| 8 | OUT B | Amplifier B output - Identical AC/DC performance to OUT A; supports simultaneous dual-sensor readout. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers 99.7% of full supply range at 16 V, preserving signal headroom in single-supply 12-bit+ data acquisition. |
| Low input bias current (1 pA max) | Enables direct interfacing with high-impedance sources like photodiodes and electrochemical sensors without guard rings or T-networks. |
| Wide supply range (5–16 V) | Eliminates external regulators when paired with industrial 12 V or automotive 13.5 V rails, reducing BOM count and power loss. |
| −40°C to +125°C operation | Validated for extended temperature environments including engine control units and factory automation PLC modules. |
| 8 nV/√Hz noise @ 10 kHz | Supports clean amplification of audio and bio-potential signals without requiring post-amplifier filtering or oversampling. |
Applications
| Photodiode Signal Conditioning | Medical Electrode Buffer |
|---|---|
Use Scenario: Amplifying weak current from silicon photodiodes in optical smoke detectors or pulse oximeters. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1 pA input bias minimizing dark current error and enabling >100 MΩ feedback resistors. Use Value: Achieves sub-picoampere resolution without active guarding, reducing PCB area and component count versus JFET alternatives. |
Use Scenario: Buffering microvolt-level ECG/EEG electrode signals in portable patient monitors. IC Role / Device Role / Timing Role: High-input-impedance non-inverting buffer isolating electrodes from downstream ADC input capacitance. Use Value: Maintains signal integrity with <0.1% gain error over temperature and eliminates baseline wander caused by input bias current drift. |
| Industrial Reference Buffer | Automotive Sensor Interface |
Use Scenario: Driving precision voltage references (e.g., REF5025) into multiplexer or ADC input networks. IC Role / Device Role / Timing Role: Low-offset, low-noise unity-gain follower ensuring reference stability under varying load conditions. Use Value: Limits reference output error to <2.5 mV, supporting 16-bit system accuracy without calibration. |
Use Scenario: Conditioning signals from exhaust gas oxygen (EGO) sensors and knock sensors in engine control modules. IC Role / Device Role / Timing Role: Dual-channel signal conditioner handling both sensor excitation and response amplification within same IC. Use Value: Meets AEC-Q100 Grade 1 requirements with guaranteed −40°C to +125°C operation and automotive-qualified W-grade variants. |
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 |
|---|---|---|---|
| OPA2333AIDR | Zero-drift architecture; 0.02 μV/°C offset drift vs. AD8666ARMZ's 10 μV/°C; higher 1.8 μV p-p 0.1–10 Hz noise. | Better for DC-critical applications (e.g., weigh scales); less optimal for AC-coupled sensor paths due to higher 1/f noise. | Select OPA2333AIDR when long-term DC stability dominates over broadband noise; retain AD8666ARMZ for balanced precision + speed + noise. |
| ADA4077-2ARMZ | Lower 25 μV max offset but higher 2 nA input bias current; 10 MHz GBW vs. 4 MHz; requires ±15 V min supply. | Suitable for high-speed instrumentation; incompatible with 5 V-only systems or >100 MΩ source impedances. | Choose ADA4077-2ARMZ for high-gain, high-bandwidth circuits needing <0.1% offset; AD8666ARMZ remains preferred for low-bias, wide-supply flexibility. |
Compared with OPA2333AIDR and ADA4077-2ARMZ, AD8666ARMZ uniquely balances ultra-low input bias current, 4 MHz bandwidth, and 5–16 V single-supply operation-making it optimal for photodiode, medical, and automotive sensor front-ends where impedance matching and supply simplicity are critical.
Availability
AD8666ARMZ is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive ECU signal conditioning, and medical device analog front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8666ARMZ 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-accuracy analog signal chains in industrial automation, automotive sensing, and portable medical equipment-emphasizing low input bias current, rail-to-rail output, and extended temperature operation without premium JFET pricing.
FAQ
What is the maximum supply voltage rating for AD8666ARMZ?
The AD8666ARMZ has an absolute maximum supply voltage rating of 18 V across V+ and V− terminals. Continuous operation is specified up to 16 V, with electrical characteristics guaranteed from 5 V to 16 V (single-supply) or ±2.5 V to ±8 V (dual-supply). Exceeding 18 V risks permanent damage per the Absolute Maximum Ratings table.
Does AD8666ARMZ support true rail-to-rail input operation?
No, AD8666ARMZ does not support rail-to-rail input. Its input common-mode voltage range extends from −0.1 V to +14.0 V at 16 V supply (or −0.1 V to +3.0 V at 5 V), meaning it operates within 0.1 V of ground but not to the positive rail. Input signals must remain ≥0.1 V below V+ to ensure specified performance.
Is AD8666ARMZ pin-compatible with other devices in the AD866x family?
Yes, AD8666ARMZ shares identical pinout with AD8666ARZ (SOIC_N) and AD8666WARZ (automotive SOIC_N) in the 8-lead configuration. All AD8666 variants use the same dual-amplifier pin assignment (OUT A, −IN A, +IN A, V−, V+, +IN B, −IN B, OUT B), enabling direct footprint reuse across package types.
What is the typical supply current per amplifier for AD8666ARMZ at 25°C?
The typical supply current per amplifier for AD8666ARMZ is 1.4 mA at 25°C and 5 V supply, rising to 1.55 mA at 16 V supply. Over the full −40°C to +125°C range, maximum supply current per amplifier is 2.0 mA, enabling predictable power budgeting in thermally constrained designs.
Can AD8666ARMZ drive capacitive loads without instability?
AD8666ARMZ is unity-gain stable but exhibits increasing overshoot with capacitive loads >100 pF. Figure 21 shows 10% overshoot at 100 pF and >30% at 1000 pF. For loads >100 pF, a series resistor (≥100 Ω) between amplifier output and capacitance is recommended to maintain phase margin >70° and prevent ringing.
AD8666ARMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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-MSOP
AD8666ARMZ FAQ
1.How can I place an order for AD8666ARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8666ARMZ 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 AD8666ARMZ reliable?
The price and inventory of AD8666ARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8666ARMZ is usually 5 days.
3.What payment methods are accepted for AD8666ARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8666ARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8666ARMZ?
AD8666ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8666ARMZ 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 AD8666ARMZ?
For technical support, including AD8666ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8666ARMZ requirements.
6.How does Aetrix verify that AD8666ARMZ is sourced from the original manufacturer or authorized distributors?
All AD8666ARMZ 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 AD8666ARMZ meets industry standards.
7.What is the process for return or replacement of AD8666ARMZ?
All AD8666ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8666ARMZ, 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 AD8666ARMZ part is unused and in its original packaging.
Return procedure for AD8666ARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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