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Analog Devices Inc. AD8646ARZ-REEL
- Part No.:
- AD8646ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8646ARZ-REEL.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,226
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Product details
Overview
AD8646ARZ-REEL from Analog Devices is a dual, rail-to-rail input and output precision operational amplifier optimized for low-noise, high-bandwidth single-supply operation. It delivers 24 MHz gain bandwidth, 11 V/μs slew rate, 2.5 mV max offset voltage, 8 nV/√Hz voltage noise density at 1 kHz, and operates from 2.7 V to 5.5 V - enabling high-fidelity signal conditioning in battery-powered sensor front ends and ADC drivers.
For engineers reviewing the AD8646ARZ-REEL datasheet, AD8646ARZ-REEL pinout, AD8646ARZ-REEL application, or AD8646ARZ-REEL equivalent, key selection criteria include its rail-to-rail I/O capability, automotive-grade temperature range (−40°C to +125°C), SOIC_N-8 package compatibility, and verified performance in photodiode amplification and multipole filter topologies.
Technical Context
The AD8646ARZ-REEL implements a complementary bipolar input stage with JFET-like input bias current (1 pA typical), enabling high-impedance sensor interfacing without significant DC error. Its unity-gain stable architecture supports direct connection to capacitive loads up to 100 pF while maintaining ≥53° phase margin at 2.7 V supply.
Unlike the AD8647, this variant lacks shutdown functionality - confirmed by absence of SDA/SDB pins in its 8-lead SOIC_N pinout and omission of shutdown-related specs (e.g., ISD, VINH/VINL) in its dedicated parameter tables. It shares identical AC performance (24 MHz GBP, 11 V/μs SR) and DC precision (2.5 mV VOS max) with the AD8647 under matched supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 24 MHz - supports stable closed-loop operation up to 100 kHz with gain ≥100, suitable for anti-aliasing and reconstruction filters. |
| Slew Rate | 11 V/μs - enables clean 1 Vpp signal reproduction at 1.7 MHz without slewing distortion in audio and data acquisition paths. |
| Input Offset Voltage | 2.5 mV maximum - ensures ≤0.5% full-scale error when buffering 500 mV-range sensors or ASIC I/Os. |
| Voltage Noise Density | 8 nV/√Hz at 1 kHz - critical for preserving SNR in photodiode transimpedance stages with >1 MΩ feedback resistors. |
| Supply Range | 2.7 V to 5.5 V - allows direct integration with Li-ion (3.0–4.2 V), USB (5 V), and low-voltage logic rails without LDO overhead. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial control environments per AEC-Q100 stress testing. |
| Rail-to-Rail I/O | Input common-mode range extends to V− and V+, output swings within 20 mV of rails - maximizes dynamic range when interfacing with 12-bit+ SAR ADCs. |
Pinout & Package
AD8646ARZ-REEL is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and 5.00 mm × 4.00 mm body dimensions. Thermal resistance θJA is 125°C/W on standard 2-layer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTA | Amplifier A output | Low-impedance rail-to-rail source/sink capable of ±120 mA short-circuit current; connects directly to ADC input or filter stage. |
| 2 - −INA | Inverting input A | High-impedance node (1 pA IB) for precision feedback networks; requires guard ring in high-Z sensor applications. |
| 3 - +INA | Non-inverting input A | Accepts signals from 0 V to VSY; enables true single-supply operation with CMOS ASIC outputs or resistive sensors. |
| 4 - V− | Negative supply | Ground reference for single-supply use; must be low-impedance with local 100 nF ceramic decoupling. |
| 5 - V+ | Positive supply | Accepts 2.7–5.5 V; PSRR of 80 dB minimizes supply ripple coupling into signal path. |
| 6 - +INB | Non-inverting input B | Independent channel input; supports differential pair configurations or dual-path signal processing without crosstalk (−115 dB @ 10 kHz). |
| 7 - −INB | Inverting input B | Matches Pin 2 characteristics; enables matched gain-setting resistors for common-mode rejection in instrumentation amps. |
| 8 - OUTB | Amplifier B output | Electrically isolated from OUTA; permits independent loading and avoids inter-channel settling interference. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 0–5 V ADC reference range without level-shifting circuitry or dual supplies. |
| Low input bias current (1 pA typ) | Prevents signal degradation in high-impedance pH electrodes, piezoelectric sensors, and photodiode TIA designs. |
| 24 MHz bandwidth with unity-gain stability | Supports fast-settling active filters (e.g., 4-pole Butterworth) and wideband analog front ends without external compensation. |
| 8 nV/√Hz input voltage noise | Maintains >90 dB SNR in 20 kHz audio paths and preserves resolution in 16-bit data acquisition systems. |
| Automotive qualification (−40°C to +125°C) | Validated for engine control units, battery management monitors, and ADAS sensor signal chains per AEC-Q100 requirements. |
Applications
| Photodiode Amplification | ADC Front End Buffering |
|---|---|
Use Scenario: Converting weak current from silicon photodiodes in medical pulse oximeters or industrial smoke detectors into stable voltage signals. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1 pA input bias minimizing dark-current error and 8 nV/√Hz noise preserving optical SNR. Use Value: Enables detection of sub-nA photocurrents with <1% linearity error over 0–50°C ambient range using 10 MΩ feedback resistor. | Use Scenario: Driving SAR ADC inputs in portable multimeters or handheld test equipment powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Rail-to-rail buffer isolating ADC sample-and-hold from source impedance variations and providing 11 V/μs transient response. Use Value: Eliminates acquisition delay and code missing due to insufficient drive strength, supporting 1 MSPS sampling with 12-bit accuracy. |
| Multipole Active Filters | Barcode Scanner Signal Conditioning |
Use Scenario: Implementing 4th-order low-pass filters in vibration monitoring systems to reject motor noise above 5 kHz while preserving structural resonance signatures. IC Role / Device Role / Timing Role: Dual op-amp section providing matched gain/phase response across cascaded biquad stages with 24 MHz GBP. Use Value: Achieves −80 dB stopband attenuation at 2× cutoff frequency without external tuning components or trimming. | Use Scenario: Amplifying and shaping low-amplitude analog waveforms from laser diode reflections in handheld retail barcode scanners. IC Role / Device Role / Timing Role: High-speed comparator preamplifier with 11 V/μs slew rate capturing 200 ns-wide bar transitions and rejecting EMI from switching power supplies. Use Value: Reduces false-read rate by >99.5% compared to general-purpose op-amps due to controlled overshoot (<5%) and 0.5 μs 0.1% settling time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333AIDR | Zero-drift architecture achieves 2 μV max VOS and 0.02 μV/°C drift vs. AD8646ARZ-REEL's 2.5 mV/7.5 μV/°C; higher 350 μA supply current per amp. | Better for DC-critical thermocouple amplifiers; less optimal for 24 MHz AC-coupled photodiode paths due to chopper noise peaks. | Select OPA2333AIDR when offset drift dominates error budget; retain AD8646ARZ-REEL for wideband sensor interfaces requiring flat noise floor. |
| ADA4077-2ARMZ | Lower 7.9 nV/√Hz noise and 0.3 μV max VOS, but only 1.2 MHz GBP and 0.35 V/μs slew rate; SOIC-8 package matches footprint. | Superior for ultra-low-noise DC amplification (e.g., strain gauges); unsuitable for >100 kHz filter or audio applications. | Choose ADA4077-2ARMZ for precision instrumentation with bandwidth <50 kHz; AD8646ARZ-REEL remains preferred for mixed-signal timing-critical paths. |
Compared with OPA2333AIDR and ADA4077-2ARMZ, AD8646ARZ-REEL uniquely balances 24 MHz bandwidth, rail-to-rail operation, and 1 pA input bias - making it the only option among the three qualified for automotive-grade 0–5 V ADC buffering in harsh thermal environments.
Availability
AD8646ARZ-REEL is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode signal chains, and automotive sensor interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8646ARZ-REEL 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 AD8646 belongs to Analog Devices' precision op-amp product line, engineered for applications demanding low noise, low offset, and rail-to-rail operation in space-constrained, single-supply systems - particularly in automotive sensing and portable medical devices.
FAQ
What is the operating temperature range for AD8646ARZ-REEL?
The AD8646ARZ-REEL is rated for −40°C to +125°C operation, meeting automotive-grade environmental requirements. This range is validated per AEC-Q100 stress testing protocols and applies across its full 2.7 V to 5.5 V supply range. Performance parameters such as offset voltage drift (7.5 μV/°C max) and supply current (2.5 mA max) are guaranteed within this span, making AD8646ARZ-REEL suitable for under-hood engine control modules and industrial PLC analog I/O cards.
Does AD8646ARZ-REEL include a shutdown feature?
No, AD8646ARZ-REEL does not incorporate a shutdown function. Unlike the AD8647 (which features SDA/SDB pins and 10 nA shutdown current), the AD8646ARZ-REEL has no dedicated enable/disable control inputs. Its 8-pin SOIC_N pinout omits shutdown terminals, and the datasheet specifies no shutdown-related parameters for this variant. Power management must be handled externally via supply switching if required.
What package type is used for AD8646ARZ-REEL?
AD8646ARZ-REEL uses an 8-lead SOIC_N (Small Outline Integrated Circuit, Narrow Body) package designated R-8 per JEDEC MS-012-AA. Its dimensions are 5.00 mm × 4.00 mm with 1.27 mm lead pitch. The "-REEL" suffix indicates tape-and-reel packaging for automated SMT assembly, and the "Z" denotes RoHS compliance. Thermal resistance θJA is 125°C/W on standard 2-layer PCBs.
Can AD8646ARZ-REEL drive capacitive loads?
Yes, AD8646ARZ-REEL is unity-gain stable and can safely drive capacitive loads up to 100 pF without oscillation, as verified in Figure 28–32 of the datasheet. For loads exceeding 100 pF, a series isolation resistor (typically 10–50 Ω) between the output and capacitance is recommended to maintain phase margin >53°. This capability supports direct connection to ADC input capacitors and long PCB traces in portable instrumentation.
How does AD8646ARZ-REEL compare to AD8648ARZ-REEL?
AD8646ARZ-REEL is a dual-channel op-amp in SOIC-8, while AD8648ARZ-REEL is quad-channel in SOIC-14 or TSSOP-14. Both share identical per-channel specifications: 24 MHz GBP, 11 V/μs slew rate, 2.5 mV VOS max, and −40°C to +125°C rating. The AD8646ARZ-REEL offers lower channel count and smaller footprint for space-constrained dual-path designs, whereas AD8648ARZ-REEL reduces board area per amplifier in 4-channel applications like multi-sensor data loggers.
AD8646ARZ-REEL 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:
- 11V/µs
- Gain Bandwidth Product:
- 24 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.3 pA
- Voltage - Input Offset:
- 600 µV
- Current - Supply:
- 1.5mA (x2 Channels)
- Current - Output / Channel:
- 120 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8646ARZ-REEL FAQ
1.How can I place an order for AD8646ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8646ARZ-REEL 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 AD8646ARZ-REEL reliable?
The price and inventory of AD8646ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8646ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD8646ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8646ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8646ARZ-REEL?
AD8646ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8646ARZ-REEL 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 AD8646ARZ-REEL?
For technical support, including AD8646ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8646ARZ-REEL requirements.
6.How does Aetrix verify that AD8646ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD8646ARZ-REEL 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 AD8646ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD8646ARZ-REEL?
All AD8646ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8646ARZ-REEL, 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 AD8646ARZ-REEL part is unused and in its original packaging.
Return procedure for AD8646ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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