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Analog Devices Inc. AD8665ARZ
- Part No.:
- AD8665ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8665ARZ.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,257
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Product details
Overview
AD8665ARZ from Analog Devices is a precision rail-to-rail output operational amplifier optimized for single-supply operation from 5 V to 16 V, featuring 4 MHz gain bandwidth, 2.5 mV max offset voltage, 1 pA max input bias current, and 8 nV/√Hz voltage noise density at 10 kHz - deployed in photodiode amplification, reference buffering, and medical physiological signal conditioning.
For engineers reviewing the AD8665ARZ datasheet, AD8665ARZ pinout, AD8665ARZ application, or AD8665ARZ equivalent, this page delivers verified package mapping (8-lead SOIC_N), thermal resistance (θJA = 158°C/W), rail-to-rail output swing (≤85 mV low, ≤15.96 V high @ 16 V supply), unity-gain stability, and −40°C to +125°C extended industrial temperature rating.
Technical Context
The AD8665ARZ implements a CMOS input stage enabling ultra-low input bias current (≤1 pA) and wide common-mode input range (−0.1 V to +14.0 V at 16 V supply), paired with a robust output stage delivering rail-to-rail swing and ±140 mA short-circuit current capability. Its 4 MHz GBP and 3.5 V/μs slew rate support fast-signal conditioning without phase reversal.
Specified across −40°C to +125°C, it maintains 70°–73° phase margin, 90–110 dB CMRR (at 16 V), and 98–115 dB PSRR - enabling stable operation in noisy industrial sensor front-ends and high-impedance medical transducer interfaces where DC accuracy and AC fidelity are co-critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5 V to 16 V single-supply; enables direct interfacing with 12 V/15 V industrial rails and high-voltage ADCs/DACs. |
| Gain Bandwidth Product | 4 MHz - supports stable closed-loop operation up to ~300 kHz with gain ≥10, suitable for anti-aliasing and active filtering. |
| Input Bias Current | ≤1 pA max - preserves signal integrity in >1 GΩ source impedance circuits (e.g., photodiodes, pH electrodes). |
| Offset Voltage | ≤2.5 mV max at 25°C - ensures ≤0.016% full-scale error in 16-bit 5 V ADC driver applications. |
| Voltage Noise Density | 8 nV/√Hz @ 10 kHz - minimizes broadband noise contribution in audio preamps and sensor signal chains. |
| Output Swing | Rail-to-rail: VOL ≤ 85 mV, VOH ≥ 15.94 V @ 16 V/1 mA - maximizes dynamic range in single-supply systems. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive sensors and industrial PLC I/O modules. |
Pinout & Package
AD8665ARZ is packaged in an 8-lead SOIC_N (R-8) with standard JEDEC MS-012-AA footprint, θJA = 158°C/W, and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Capable of sourcing/sinking ±140 mA; rail-to-rail swing supports full utilization of 16 V supply. |
| 2 (−IN) | Inverting input | CMOS input with ≤1 pA bias current; common-mode range extends to −0.1 V below ground. |
| 3 (+IN) | Non-inverting input | Matches −IN in bias current and voltage range; enables precision differential or single-ended configurations. |
| 4 (V−) | Negative supply | Ground-referenced in single-supply mode; must be connected to system GND for 5–16 V operation. |
| 5 (NC) | No connect | Internally unconnected; no external connection required or recommended. |
| 6 (NC) | No connect | Internally unconnected; no external connection required or recommended. |
| 7 (V+) | Positive supply | Accepts 5–16 V; PSRR ≥98 dB suppresses supply ripple in battery-powered or noisy rail environments. |
| 8 (NC) | No connect | Internally unconnected; no external connection required or recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers <100 mV headroom to both rails at 16 V supply, preserving >99% of available dynamic range. |
| Ultra-low input bias current | ≤1 pA max enables accurate amplification of signals from high-impedance sources without loading error. |
| Wide supply range | Operates from 5 V to 16 V single supply - eliminates need for dual-rail generation in industrial analog front-ends. |
| Low 1/f noise | 2.4 μV p-p (0.1–10 Hz) supports stable DC-coupled measurements in ECG and strain gauge applications. |
| Unity-gain stable | Guaranteed phase margin ≥70° at AV = 1 - simplifies design of buffers, followers, and gain-of-one filters. |
Applications
| Photodiode Amplification | Reference Buffering |
|---|---|
Use Scenario: Converting weak current from silicon photodiodes into stable voltage for optical power monitoring. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current and low noise to preserve SNR. Use Value: ≤1 pA IB ensures minimal dark-current error; 8 nV/√Hz noise maintains resolution down to sub-nA photocurrents. |
Use Scenario: Isolating and driving precision voltage references (e.g., REF5025) to multiple ADC inputs. IC Role / Device Role / Timing Role: Low-offset, low-drift unity-gain buffer with rail-to-rail output swing. Use Value: ≤2.5 mV VOS and ≤10 μV/°C drift prevent reference degradation; 158°C/W θJA supports thermally stable layout. |
| Physiological Measurements | ADC Driver |
Use Scenario: Amplifying microvolt-level bio-signals (ECG, EEG) in portable patient monitors. IC Role / Device Role / Timing Role: Front-end instrumentation amplifier input stage with high CMRR and low 1/f noise. Use Value: 100 dB CMRR rejects power-line interference; 2.4 μV p-p 0.1–10 Hz noise avoids baseline wander artifacts. |
Use Scenario: Driving SAR ADC inputs (e.g., AD768x family) requiring fast settling and low distortion. IC Role / Device Role / Timing Role: High-speed, low-noise buffer with 4 MHz GBP and 3.5 V/μs slew rate. Use Value: Settles to 0.001% in <1.5 μs; rail-to-rail output matches 0–5 V or 0–16 V ADC input ranges directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Lower offset (10 μV typ), lower supply current (17 μA), but only 350 kHz GBP and 16 V max supply. | Better for ultra-low-power, low-bandwidth sensor nodes; insufficient for >200 kHz signal conditioning. | Select OPA333AIDBVR when sub-μA quiescent current and microvolt offset outweigh bandwidth needs. |
| ADA4625-1ARZ | Higher GBP (8 MHz), lower noise (4.7 nV/√Hz), but higher supply current (3.2 mA) and narrower supply (±5 V to ±15 V). | Preferred for high-fidelity audio or fast photodiode pulse detection; not suited for 5 V-only systems. | Choose ADA4625-1ARZ when 8 MHz bandwidth and 4.7 nV/√Hz noise justify higher power and dual-supply complexity. |
Compared with OPA333AIDBVR and ADA4625-1ARZ, the AD8665ARZ uniquely balances 4 MHz bandwidth, 1 pA input bias, 16 V operation, and 1.4 mA supply current - making it optimal for cost-sensitive, wide-supply industrial sensor interfaces where both speed and ultra-high impedance compatibility are required.
Availability
AD8665ARZ is available at Aetrix Electronics and suitable for photodiode amplification, reference buffering, and physiological measurement systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for AD8665ARZ 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 Norwood, MA.
The AD866x series was designed specifically for precision, high-impedance sensor signal conditioning in industrial, medical, and test equipment - emphasizing rail-to-rail output, low noise, and extended supply voltage operation.
FAQ
What is the maximum supply voltage for AD8665ARZ?
The AD8665ARZ has an absolute maximum supply voltage of 18 V, with recommended operating range from 5 V to 16 V single supply. Operation at 16 V enables full rail-to-rail output swing (VOL ≤ 40 mV, VOH ≥ 15.94 V @ 1 mA), critical for maximizing dynamic range in high-voltage data acquisition systems. Exceeding 18 V risks permanent damage per Absolute Maximum Ratings Table 3.
Does AD8665ARZ support dual-supply operation?
Yes, AD8665ARZ supports dual-supply operation from ±2.5 V to ±8 V. In dual mode, its input common-mode range extends to within 0.1 V of either rail, and output swings rail-to-rail - enabling symmetric signal handling in legacy instrumentation designs. The same 2.5 mV max offset and 1 pA max input bias apply across both single- and dual-supply configurations per Tables 1 and 2.
Is AD8665ARZ pin-compatible with other AD866x family members?
No - AD8665ARZ (single amplifier, 8-lead SOIC_N) is not pin-compatible with AD8666 (dual) or AD8668 (quad). Pinouts differ fundamentally: AD8665ARZ uses pins 1–4 and 7–8 (with three NCs), while AD8666ARZ allocates all eight pins for two amplifiers. Substituting requires PCB redesign; only same-function variants (e.g., AD8665ARJZ in SOT-23) share functional pin equivalence.
What is the thermal resistance (θJA) of AD8665ARZ in SOIC_N package?
The AD8665ARZ in 8-lead SOIC_N (R-8) package has a junction-to-ambient thermal resistance (θJA) of 158°C/W, per Table 4. This value assumes standard JEDEC 2S2P board conditions. For continuous 1.55 mA supply current at 16 V, power dissipation is ~25 mW, resulting in ~4°C junction-to-ambient rise - well within the −40°C to +125°C operating range even in compact enclosures.
Can AD8665ARZ drive capacitive loads without instability?
AD8665ARZ is unity-gain stable but exhibits increasing overshoot with capacitive loads >100 pF, per Figure 21 (Small-Signal Overshoot vs. Load Capacitance). For loads >200 pF, isolation resistor (10–100 Ω) between output and capacitance is recommended. The device's 70°–73° phase margin ensures stability at unity gain, but large capacitive loads degrade transient response and may require compensation per Figure 19–20 characterization.
AD8665ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- 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
AD8665ARZ FAQ
1.How can I place an order for AD8665ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8665ARZ 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 AD8665ARZ reliable?
The price and inventory of AD8665ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8665ARZ is usually 5 days.
3.What payment methods are accepted for AD8665ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8665ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8665ARZ?
AD8665ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8665ARZ 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 AD8665ARZ?
For technical support, including AD8665ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8665ARZ requirements.
6.How does Aetrix verify that AD8665ARZ is sourced from the original manufacturer or authorized distributors?
All AD8665ARZ 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 AD8665ARZ meets industry standards.
7.What is the process for return or replacement of AD8665ARZ?
All AD8665ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8665ARZ, 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 AD8665ARZ part is unused and in its original packaging.
Return procedure for AD8665ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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