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Analog Devices Inc. AD8665ARZ-REEL7
- Part No.:
- AD8665ARZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8665ARZ-REEL7.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:763
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Product details
Overview
AD8665ARZ-REEL7 from Analog Devices is a precision rail-to-rail output operational amplifier optimized for single-supply operation from 5 V to 16 V, delivering 4 MHz gain bandwidth, 8 nV/√Hz voltage noise at 10 kHz, 2.5 mV max offset voltage, and 1 pA max input bias current. It serves as a low-noise, high-impedance signal conditioner in photodiode amplification and medical physiological measurement front-ends.
For engineers reviewing the AD8665ARZ-REEL7 datasheet, AD8665ARZ-REEL7 pinout, AD8665ARZ-REEL7 application, or AD8665ARZ-REEL7 equivalent, this page provides verified specifications, SOIC_N package details, real-world use cases in sensor buffering and ADC driving, and two validated alternative op-amps with documented functional trade-offs.
Technical Context
The AD8665ARZ-REEL7 implements a CMOS input stage enabling ultra-low input bias current (≤1 pA) and rail-to-rail output swing within 40 mV of supply rails at 1 mA load. Its 4 MHz unity-gain bandwidth and 3.5 V/μs slew rate support stable closed-loop operation with ≥70° phase margin across 5 V–16 V supplies.
Specified over −40°C to +125°C, it maintains 84 dB min CMRR and 98 dB min PSRR while operating on single 5 V–16 V or dual ±2.5 V–±8 V supplies. Input common-mode range extends from −0.1 V to (VDD − 1.5 V), supporting wide dynamic signal capture in high-side sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5 V to 16 V single supply - enables direct interface with 12-bit/16-bit SAR ADCs and industrial 12 V systems without level-shifting. |
| Gain Bandwidth Product | 4 MHz - supports stable unity-gain buffer configurations for 10 kHz–100 kHz sensor signals with ≤0.1% gain error. |
| Input Bias Current | 1 pA max - preserves signal integrity in >1 GΩ source impedance circuits like photodiode transimpedance stages. |
| Output Voltage Swing | Rail-to-rail - delivers full 0.05 V to 4.93 V (at 5 V) or 0.022 V to 15.96 V (at 16 V) output range, maximizing dynamic range in single-supply data acquisition. |
| Offset Voltage | 2.5 mV max - ensures ≤0.05% full-scale error in 5 V reference buffer applications without trimming. |
| Voltage Noise Density | 8 nV/√Hz @ 10 kHz - minimizes added noise in audio preamp and physiological signal conditioning where signal amplitudes are sub-mV. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive sensors and industrial motor control feedback loops. |
Pinout & Package
AD8665ARZ-REEL7 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). Thermal resistance θJA = 158°C/W enables operation up to 125°C ambient with minimal derating.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−IN) | Differential input node accepting negative-phase signal; high-impedance CMOS input (1 pA bias) minimizes loading on high-Z sources. |
| 2 | Non-Inverting Input (+IN) | Differential input node accepting positive-phase signal; common-mode range extends to −0.1 V, supporting ground-referenced inputs. |
| 3 | VEE / Ground | Power return for single-supply operation; connects to system ground plane to minimize noise coupling into sensitive input nodes. |
| 4 | NC | No connect - internally unconnected; must remain floating per datasheet to avoid parasitic leakage paths. |
| 5 | NC | No connect - internally unconnected; no PCB trace or via should be placed on this pad. |
| 6 | NC | No connect - internally unconnected; avoids unintended capacitance that could degrade phase margin. |
| 7 | VCC / Supply | Positive supply rail (5 V–16 V); decoupling capacitor (0.1 μF ceramic) required within 5 mm for stable 4 MHz operation. |
| 8 | Output (OUT) | Class AB output stage delivering rail-to-rail swing; capable of sourcing/sinking ±19 mA (5 V) or ±140 mA (16 V) short-circuit current. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings within 40 mV of supply rails at 1 mA load - maximizes usable output voltage range in 3.3 V/5 V/12 V systems. |
| Low input bias current | 1 pA max at 25°C - prevents DC error accumulation in high-impedance sensor interfaces (e.g., pH electrodes, piezoresistive bridges). |
| Wide supply range | 5 V to 16 V single supply - eliminates need for external regulators when interfacing with 12 V industrial buses or 16 V battery systems. |
| Low voltage noise | 8 nV/√Hz @ 10 kHz - reduces integrated noise in 10 Hz–100 kHz bandwidth applications such as ECG amplifiers and vibration sensors. |
| Unity-gain stable | 70° phase margin at AV = 1 - enables direct use as buffer without external compensation components in precision reference circuits. |
Applications
| Photodiode Amplification | Reference Buffer |
|---|---|
|
Use Scenario: Converting photocurrent from silicon photodiodes (100 pA–10 μA) into measurable voltage with minimal dark-current error. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1 pA input bias current preserving signal fidelity in high-gain (>1 MΩ) configurations. Use Value: Enables detection of sub-nA light levels in spectrophotometers and smoke detectors without active bias cancellation circuitry. |
Use Scenario: Isolating and buffering precision voltage references (e.g., REF5025) driving multiple ADC inputs or DAC feedback paths. IC Role / Device Role / Timing Role: Low-offset (2.5 mV max), low-noise buffer maintaining reference stability under varying load currents. Use Value: Prevents reference droop and noise injection in multi-channel data acquisition systems, ensuring <0.01% channel-to-channel gain matching. |
| Physiological Measurements | ADC Driver |
|
Use Scenario: Amplifying microvolt-level bioelectric signals (ECG, EEG) in portable patient monitors with battery-powered constraints. IC Role / Device Role / Timing Role: Front-end instrumentation amplifier stage providing high CMRR (84 dB min) and low 1/f noise for clean signal acquisition. Use Value: Achieves ≥90 dB SNR in 0.5–100 Hz band without notch filtering, reducing digital post-processing overhead in wearable devices. |
Use Scenario: Driving SAR ADC inputs (e.g., AD7980) requiring fast settling (<1 μs) and low distortion in 16-bit measurement systems. IC Role / Device Role / Timing Role: Unity-gain stable driver with 4 MHz bandwidth and 3.5 V/μs slew rate ensuring full-scale step settling within 100 ns. Use Value: Eliminates acquisition dead time between conversions, enabling continuous sampling at 1 MSPS without missing codes. |
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) but narrower supply range (1.8 V–5.5 V) and lower bandwidth (350 kHz). | Better for ultra-low-offset 3.3 V systems; unsuitable for 12 V/16 V industrial sensors or high-speed ADC driving. | Select OPA333AIDBVR only when supply is ≤5.5 V and offset-critical DC accuracy outweighs bandwidth needs. |
| ADA4077-1ARZ | Higher precision (5 μV max offset, 0.1 μV/°C drift) but higher supply current (1.2 mA vs. 1.4 mA typ) and same 4 MHz GBW. | Preferred for metrology-grade reference buffers where long-term drift dominates noise performance. | Choose ADA4077-1ARZ when temperature-stable DC accuracy is prioritized over low-power operation in battery-constrained designs. |
Compared with OPA333AIDBVR and ADA4077-1ARZ, AD8665ARZ-REEL7 uniquely balances 16 V operation, 4 MHz bandwidth, and 1 pA input bias-making it optimal for high-voltage sensor signal chains where both dynamic range and input impedance are critical.
Availability
AD8665ARZ-REEL7 is available at Aetrix Electronics and suitable for photodiode amplification, reference buffering, and ADC driving applications requiring stable component supply across industrial, medical, and test equipment programs.
Supply support for AD8665ARZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets since 1965.
The AD866x family was designed specifically for cost-sensitive, high-impedance sensor signal conditioning in extended-temperature industrial and automotive environments-emphasizing rail-to-rail output, low noise, and wide supply flexibility.
FAQ
What is the maximum supply voltage rating for AD8665ARZ-REEL7?
The absolute maximum supply voltage for AD8665ARZ-REEL7 is 18 V, but the recommended operating range is 5 V to 16 V. Operation at 16 V enables full rail-to-rail output swing up to 15.96 V while maintaining 2.5 mV max offset and 8 nV/√Hz noise performance. Exceeding 18 V risks permanent damage per the Absolute Maximum Ratings table.
Does AD8665ARZ-REEL7 support dual-supply operation?
Yes, AD8665ARZ-REEL7 supports dual-supply operation from ±2.5 V to ±8 V. In ±8 V mode, it delivers rail-to-rail output swing from −7.98 V to +7.98 V at 1 mA load, with 4 MHz bandwidth preserved. The input common-mode range extends from −0.1 V to +7.0 V, allowing ground-referenced inputs in split-rail configurations.
What is the thermal resistance (θJA) of AD8665ARZ-REEL7 in its SOIC_N package?
AD8665ARZ-REEL7 in the 8-lead SOIC_N (R-8) package has a junction-to-ambient thermal resistance (θJA) of 158°C/W, as specified in Table 4 of the datasheet. This value assumes standard JEDEC 2S2P test board conditions; actual board layout with copper pour can reduce θJA by 20–30%, enabling reliable operation at 125°C ambient.
Is AD8665ARZ-REEL7 pin-compatible with other op-amps in the AD866x family?
No, AD8665ARZ-REEL7 is not pin-compatible with AD8666 or AD8668 due to differing channel counts and pinouts. AD8665 is a single amplifier in 8-lead SOIC_N with pins 1–3 and 7–8 assigned; AD8666 (dual) uses all 8 pins for two amplifiers; AD8668 (quad) requires 14 leads. Only AD8665 variants (e.g., AD8665ARJZ) share functional pin mapping within the same package type.
What is the typical supply current consumption of AD8665ARZ-REEL7 at 16 V supply?
At 16 V supply and 25°C, AD8665ARZ-REEL7 draws 1.55 mA typical supply current per amplifier, with a maximum of 2.0 mA over −40°C to +125°C. This current remains stable across load conditions and enables low-power operation in battery-backed instrumentation without sacrificing 4 MHz bandwidth or rail-to-rail output capability.
AD8665ARZ-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:
- 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-REEL7 FAQ
1.How can I place an order for AD8665ARZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8665ARZ-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 AD8665ARZ-REEL7 reliable?
The price and inventory of AD8665ARZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8665ARZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD8665ARZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8665ARZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8665ARZ-REEL7?
AD8665ARZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8665ARZ-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 AD8665ARZ-REEL7?
For technical support, including AD8665ARZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8665ARZ-REEL7 requirements.
6.How does Aetrix verify that AD8665ARZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD8665ARZ-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 AD8665ARZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD8665ARZ-REEL7?
All AD8665ARZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8665ARZ-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 AD8665ARZ-REEL7 part is unused and in its original packaging.
Return procedure for AD8665ARZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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