My Inquiry
My Account
Analog Devices Inc. AD8646ARZ
- Part No.:
- AD8646ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8646ARZ.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:455
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD8646ARZ from Analog Devices is a dual, rail-to-rail input/output precision operational amplifier optimized for single-supply operation from 2.7 V to 5.5 V. It delivers 24 MHz gain bandwidth, 11 V/μs slew rate, and 2.5 mV maximum offset voltage, with 1 pA typical input bias current and 8 nV/√Hz voltage noise density at 1 kHz - enabling high-accuracy signal conditioning in battery-powered sensor interfaces and ADC front ends.
For engineers reviewing the AD8646ARZ datasheet, AD8646ARZ pinout, AD8646ARZ application, or AD8646ARZ equivalent, this page provides verified specifications, SOIC-8 package layout, automotive-grade performance validation (−40°C to +125°C), and direct alternatives for low-noise, rail-to-rail op-amp selection in portable instrumentation and photodiode amplification.
Technical Context
The AD8646ARZ employs a CMOS input stage delivering ultra-low input bias current (≤1 pA) and rail-to-rail common-mode input range (0 V to VSY). Its unity-gain-stable architecture supports wideband closed-loop configurations up to 24 MHz while maintaining 74° phase margin at 5 V supply.
It features no phase reversal under overdrive, operates down to 2.7 V, and achieves ±120 mA short-circuit output current at 5 V - making it suitable for driving low-impedance loads such as audio line drivers and multipole active filters without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 24 MHz - enables stable unity-gain operation with ≤0.1% settling in 0.5 μs for fast data acquisition front ends. |
| Input Offset Voltage | 2.5 mV max - ensures ≤0.5% error in 12-bit ADC buffer applications with 2.5 V reference. |
| Slew Rate | 11 V/μs - supports full-scale 4 Vpp signals at ≥2 MHz without distortion in active filter stages. |
| Input Bias Current | 1 pA typical - preserves signal integrity in high-impedance photodiode and piezoelectric sensor interfaces. |
| Voltage Noise Density | 8 nV/√Hz at 1 kHz - maintains SNR >90 dB in 20 kHz audio-band amplification paths. |
| Supply Current per Amplifier | 2.0 mA max at 25°C - allows dual-channel operation within 4.5 mA total for coin-cell-powered handheld devices. |
| Operating Temperature Range | −40°C to +125°C - qualified for under-hood automotive sensor signal conditioning and industrial control modules. |
Pinout & Package
AD8646ARZ 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 = 125°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Inverting amplifier output A - rail-to-rail swing (0.02 V to VSY − 0.02 V) into 2 kΩ load. |
| 2 | −INA | Inverting input A - high-impedance CMOS node (1 pA bias) compatible with passive RC networks. |
| 3 | +INA | Non-inverting input A - accepts common-mode voltages from GND to VSY with 84 dB CMRR. |
| 4 | V− | Negative supply terminal - connects to GND in single-supply systems; supports split-rail operation. |
| 5 | V+ | Positive supply terminal - accepts 2.7 V to 5.5 V; PSRR = 80 dB minimizes supply ripple coupling. |
| 6 | +INB | Non-inverting input B - independent channel with matched offset and noise performance to Channel A. |
| 7 | −INB | Inverting input B - electrically isolated from Channel A; channel separation = −115 dB at 10 kHz. |
| 8 | OUTB | Inverting amplifier output B - identical drive capability (±120 mA) and settling behavior to OUTA. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables direct interfacing with CMOS ADCs/DACs operating at full supply range without level-shifting circuitry. |
| No phase reversal | Prevents latch-up or signal inversion during input overdrive - critical in sensor fault-detection circuits. |
| Low 1/f noise corner | 0.1 Hz to 10 Hz peak-to-peak noise = 2.3 μV - supports precision DC-coupled strain gauge and thermopile amplification. |
| High output drive | Delivers ±120 mA short-circuit current - drives 600 Ω audio loads or multiple parallel inputs without external buffers. |
| Automotive qualification | AEC-Q100 stress-tested across −40°C to +125°C ambient - approved for engine control unit (ECU) and ADAS sensor signal chains. |
Applications
| Barcode Scanners | Photodiode Amplifiers |
|---|---|
Use Scenario: Amplifying low-current pulses from laser diode return signals in handheld retail scanners. IC Role / Device Role / Timing Role: Transimpedance amplifier converting 100 nA–1 μA photocurrent to 0.5–2 V analog output with <0.5 μs settling. Use Value: 8 nV/√Hz noise and 1 pA input bias preserve pulse amplitude fidelity across temperature for reliable decode accuracy. |
Use Scenario: Converting weak current from medical pulse oximetry photodiodes into conditioned voltage for ADC sampling. IC Role / Device Role / Timing Role: Precision transimpedance stage with 24 MHz bandwidth supporting >100 kHz modulation frequencies. Use Value: Rail-to-rail output swing maximizes dynamic range into 12-bit SAR ADCs, improving SpO₂ measurement resolution. |
| ASIC Input/Output Amplifiers | Audio Line Drivers |
Use Scenario: Buffering analog I/O between mixed-signal ASICs and external sensors/actuators in portable test equipment. IC Role / Device Role / Timing Role: Level-shifting and impedance-matching interface ensuring signal integrity across PCB traces. Use Value: 2.5 mV offset and 84 dB CMRR prevent DC drift and noise coupling in multi-channel ASIC data paths. |
Use Scenario: Driving 600 Ω professional audio lines from portable media players and voice-controlled IoT hubs. IC Role / Device Role / Timing Role: Low-distortion output stage delivering THD+N = 0.010% at 25 kHz with 0.1 Vpp output. Use Value: ±120 mA output current eliminates need for discrete emitter-follower buffers, reducing BOM count and board area. |
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; 0.02 μV/°C offset drift vs. AD8646ARZ's 7.5 μV/°C; higher 350 μA supply current per amp. | Better for sub-μV DC stability over temperature; less suitable for battery-constrained 24 MHz signal paths. | Select OPA2333AIDR when long-term DC accuracy dominates over bandwidth and power. |
| MCP6V82-E/SN | Chopper-stabilized; 25 μV max offset; 10 MHz GBW; 1.6 mA supply current; SOIC-8 package. | Limited bandwidth restricts use in >5 MHz active filters or fast-settling ADC drivers. | Choose MCP6V82-E/SN only for cost-sensitive, low-bandwidth (<5 MHz), ultra-low-offset applications. |
Compared with OPA2333AIDR and MCP6V82-E/SN, the AD8646ARZ uniquely balances 24 MHz bandwidth, 2.5 mV offset, 1 pA bias, and 2 mA supply current in an automotive-qualified SOIC-8 - making it optimal for high-fidelity, wideband sensor signal chains where both speed and precision are required.
Availability
AD8646ARZ is available at Aetrix Electronics and suitable for battery-powered instruments, photodiode amplifiers, and automotive sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8646ARZ 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 AD8646ARZ belongs to Analog Devices' precision rail-to-rail op-amp product line, engineered for high-speed, low-noise signal conditioning in portable, automotive, and industrial sensing systems where accuracy, bandwidth, and supply efficiency are co-critical.
FAQ
What is the maximum operating temperature range for the AD8646ARZ?
The AD8646ARZ is rated for continuous operation from −40°C to +125°C and is qualified for automotive applications per AEC-Q100. This rating is validated across all electrical parameters in Table 1 and Table 2 of the Rev. F datasheet, including offset voltage drift (≤7.5 μV/°C) and supply current (≤2.5 mA per amplifier) at maximum junction temperature.
Does the AD8646ARZ include a shutdown function?
No, the AD8646ARZ does not include a shutdown function. That feature is exclusive to the AD8647 variant (e.g., AD8647ARMZ), which adds SDA/SDB enable pins. The AD8646ARZ is a dual op-amp only - all pins are signal or supply related, with no logic control inputs. Power reduction must be achieved externally via supply gating.
Is the AD8646ARZ pin-compatible with other members of the AD864x family?
No, the AD8646ARZ (8-lead SOIC) is not pin-compatible with AD8647 (10-lead MSOP) or AD8648 (14-lead SOIC/TSSOP). Pin counts, layouts, and functions differ: AD8646ARZ has no shutdown pins, while AD8647 adds SDA/SDB on Pins 5 and 6, and AD8648 duplicates the dual-channel structure twice. Direct replacement requires PCB redesign.
What load capacitance can the AD8646ARZ safely drive without instability?
The AD8646ARZ remains stable driving up to 100 pF capacitive load with 10 kΩ series resistance (per Figure 27 and Figure 24 in the datasheet). For direct capacitive loads >100 pF, a 10–100 Ω isolation resistor in series with the output is recommended to maintain ≥53° phase margin and prevent peaking or oscillation.
How does the AD8646ARZ perform in single-supply photodiode transimpedance applications?
In single-supply photodiode TIA configurations, the AD8646ARZ leverages its rail-to-rail input (0 V to VSY) and output (0.02 V to VSY − 0.02 V), 1 pA input bias, and 8 nV/√Hz noise to achieve high gain accuracy and low dark-current error. Its 24 MHz bandwidth supports modulation frequencies up to 100 kHz, and the absence of phase reversal prevents output latch-up during transient light pulses.
AD8646ARZ 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:
- 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 FAQ
1.How can I place an order for AD8646ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8646ARZ 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 reliable?
The price and inventory of AD8646ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8646ARZ is usually 5 days.
3.What payment methods are accepted for AD8646ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8646ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8646ARZ?
AD8646ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8646ARZ 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?
For technical support, including AD8646ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8646ARZ requirements.
6.How does Aetrix verify that AD8646ARZ is sourced from the original manufacturer or authorized distributors?
All AD8646ARZ 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 meets industry standards.
7.What is the process for return or replacement of AD8646ARZ?
All AD8646ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8646ARZ, 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 part is unused and in its original packaging.
Return procedure for AD8646ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD8646ARZ Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
