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Analog Devices Inc. AD8674ARZ
- Part No.:
- AD8674ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8674ARZ.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,499
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Product details
Overview
AD8674ARZ from Analog Devices is a quad, precision, very low noise, low input bias current operational amplifier in a 14-lead SOIC_N package. It delivers 2.8 nV/√Hz voltage noise, 10 MHz gain bandwidth, 75 µV max offset voltage, 12 nA max input bias current at +25°C, and operates from ±5 V to ±15 V supplies. It is used in high-accuracy PLL loop filters, GPS receiver baseband signal conditioning, and professional audio preamplification stages.
For engineers reviewing the AD8674ARZ datasheet, AD8674ARZ pinout, AD8674ARZ application, or AD8674ARZ equivalent, this page provides verified specifications, validated pin functions, confirmed industrial-temperature (–40°C to +85°C) operation, and real-world design context for sensor front-ends, instrumentation amplifiers, and precision analog signal chains.
Technical Context
The AD8674ARZ employs a bipolar input stage optimized for ultralow voltage noise and high open-loop gain (120 dB min), enabling stable DC precision in high-gain configurations. Its input stage features matched PNP transistors with low input bias current (≤12 nA) and high common-mode rejection (100–120 dB), supporting accurate differential sensing without phase reversal even when inputs exceed supply rails by 1 V.
It achieves unity-gain stability while driving ≥1000 pF capacitive loads, and its channel separation exceeds –130 dB at 1 kHz - critical for crosstalk-sensitive quad applications like multi-channel data acquisition and active filter banks. Supply current remains tightly controlled at 3.5 mA per amplifier (typ) across ±5 V to ±15 V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 2.8 nV/√Hz @ 1 kHz - enables sub-100 nV p-p total input-referred noise in low-source-resistance (<475 Ω) precision signal paths |
| Gain Bandwidth Product | 10 MHz - supports stable closed-loop operation up to 10× gain with <1% gain error at 1 MHz |
| Input Offset Voltage | 75 µV max @ 25°C - ensures ≤0.75 mV output error in unity-gain buffer with ±10 V output swing |
| Input Bias Current | 12 nA max @ 25°C - allows use with MΩ-range feedback networks without significant DC error accumulation |
| Common-Mode Rejection | 120 dB min - rejects >99.999% of common-mode interference in differential sensor interfaces |
| Supply Range | ±5 V to ±15 V - supports dual-rail operation in legacy industrial systems and modern low-voltage designs |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, test equipment, and embedded instrumentation environments |
Pinout & Package
AD8674ARZ is housed in a 14-lead SOIC_N (R-14) package, 8.75 mm × 4.00 mm × 1.75 mm body size, with 1.27 mm lead pitch and gull-wing leads. Pin 1 identifier located at top-left corner; pins are numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to ±13.8 V (±15 V supply) with ±20 mA short-circuit capability |
| 2 | –IN A | Inverting input of Amp A - high-impedance node (3.5 GΩ common-mode RIN) requiring guarded layout |
| 3 | +IN A | Non-inverting input of Amp A - matched to –IN A for optimal CMRR and offset performance |
| 4 | V+ | Positive power supply - connects to +VS; decoupling capacitor required within 1 cm |
| 5 | +IN B | Non-inverting input of Amp B - electrically isolated but thermally coupled to other channels |
| 6 | –IN B | Inverting input of Amp B - shares same input stage architecture and noise profile as Amp A |
| 7 | OUT B | Amplifier B output - fully independent channel with identical AC/DC specs to OUT A |
| 8 | OUT D | Amplifier D output - fourth channel; pinout symmetry enables compact PCB routing for multi-channel filters |
| 9 | –IN D | Inverting input of Amp D - supports simultaneous 4-channel signal processing without inter-channel coupling degradation |
| 10 | +IN D | Non-inverting input of Amp D - referenced to same V– rail as all other inputs |
| 11 | V– | Negative power supply - returns to –VS; must be low-impedance path to ground plane |
| 12 | +IN C | Non-inverting input of Amp C - completes quad configuration; pin 12–14 form right-side input cluster |
| 13 | –IN C | Inverting input of Amp C - matches input capacitance (7.5 pF diff mode) across all four channels |
| 14 | OUT C | Amplifier C output - enables full 4-channel active filter bank or independent sensor conditioning paths |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal on overvoltage | Inputs tolerate –1 V to +16 V with ±15 V supplies - eliminates latch-up risk in transient-prone sensor interfaces |
| Stable with >1000 pF capacitive load | Enables direct connection to ADC input capacitors or long cables without external compensation |
| Channel separation >–130 dB @ 1 kHz | Prevents crosstalk-induced measurement error in multi-channel data acquisition systems |
| Low 0.1 Hz–10 Hz noise | 77 nV p-p - critical for DC-stable integrators, strain gauge bridges, and thermocouple amplifiers |
| High PSRR (115 dB typ) | Maintains accuracy despite ripple on ±15 V rails - reduces need for ultra-low-noise LDOs |
Applications
| PLL Loop Filter | GPS Baseband Signal Chain |
|---|---|
Use Scenario: Low-pass filtering of charge pump output in frequency synthesizers for wireless infrastructure. IC Role / Device Role / Timing Role: Quad op-amp implements 4th-order active loop filter with precise pole placement and minimal drift. Use Value: 75 µV offset and 0.8 µV/°C drift ensure <100 Hz frequency error over temperature - meeting GSM/UMTS spectral mask requirements. | Use Scenario: Amplifying and filtering IF signals (1.4–2.0 MHz) after downconversion in GPS/GNSS receivers. IC Role / Device Role / Timing Role: Dual-channel band-pass KRC filter with matched gain and phase response across L1/L2 bands. Use Value: 2.8 nV/√Hz noise floor preserves SNR in weak-signal acquisition (<–130 dBm); 10 MHz GBW supports 2 MHz bandwidth cleanly. |
| Multi-Channel Instrumentation | Professional Audio Preamp |
Use Scenario: Simultaneous conditioning of 4 thermocouple or RTD inputs in portable test equipment. IC Role / Device Role / Timing Role: Four independent precision buffers with programmable gain and cold-junction compensation. Use Value: Matched input bias current (≤12 nA) prevents thermal EMF errors in high-impedance sensor nodes; 120 dB CMRR rejects shared power-supply noise. | Use Scenario: Low-noise microphone preamplification in studio-grade audio interfaces. IC Role / Device Role / Timing Role: First-stage gain block with 40 dB fixed gain, followed by active anti-aliasing filter. Use Value: 0.0006% THD+N at 1 kHz ensures transparent signal reproduction; 77 nV p-p 0.1–10 Hz noise avoids audible "hiss" in quiet passages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP4177ARZ | Lower bandwidth (1.3 MHz), higher offset (60 µV max), lower noise (8 nV/√Hz), rail-to-rail output | Better suited for low-speed, high-precision DC applications (e.g., weigh scales); not ideal for GPS IF filtering | Select OP4177ARZ when ultra-low offset drift (0.2 µV/°C) outweighs bandwidth and noise requirements |
| ADA4004-4ARZ | Higher noise (12 nV/√Hz), wider temp range (–40°C to +125°C), lower supply current (1.2 mA/amplifier) | Preferred for battery-powered portable instruments where power efficiency dominates noise performance | Select ADA4004-4ARZ when operating above +85°C or under strict 3.3 V/5 V single-supply constraints |
Compared with OP4177ARZ and ADA4004-4ARZ, AD8674ARZ uniquely balances 10 MHz bandwidth, 2.8 nV/√Hz noise, and industrial temperature rating - making it optimal for high-fidelity, multi-channel analog signal chains where speed, fidelity, and thermal stability are jointly critical.
Availability
AD8674ARZ is available at Aetrix Electronics and suitable for PLL synthesizer design, GPS receiver development, and multi-channel instrumentation requiring stable component supply, traceable lot history, and guaranteed long-term availability.
Supply support for AD8674ARZ 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 AD867x family was designed specifically for high-accuracy, low-noise signal conditioning in demanding instrumentation, medical, and communications systems - prioritizing voltage noise, offset stability, and wide bandwidth over power efficiency.
FAQ
What is the maximum capacitive load the AD8674ARZ can drive without external compensation?
The AD8674ARZ is specified to remain stable with capacitive loads exceeding 1000 pF in unity-gain configuration. This allows direct interfacing with ADC input capacitors, long coaxial cables, or piezoelectric sensors without added compensation components - though for loads >1 nF in high-gain configurations, external RC compensation (e.g., 500 Ω + 220 pF) is recommended to suppress overshoot. AD8674ARZ maintains phase margin >45° under these conditions per Figure 34 and Figure 36 in the Rev. F datasheet.
Does the AD8674ARZ support single-supply operation?
The AD8674ARZ is specified for dual-supply operation from ±5 V to ±15 V and does not support true single-supply operation. Its input voltage range is rail-to-rail only in the common-mode sense (e.g., –12 V to +12 V with ±15 V supplies), but the input stage requires both positive and negative rails to function. For single-supply designs, consider the ADA4004-4ARZ or AD8604, which feature rail-to-rail input and output with 2.7 V to 36 V operation. AD8674ARZ requires symmetric dual supplies to achieve its specified 75 µV offset and 2.8 nV/√Hz noise performance.
What is the thermal resistance (θJA) of the AD8674ARZ in its SOIC_N package?
The AD8674ARZ in the 14-lead SOIC_N (R-14) package has a junction-to-ambient thermal resistance (θJA) of 90°C/W when mounted on a standard 4-layer PCB, as documented in Table 5 of the Rev. F datasheet. This value assumes worst-case board layout; actual θJA improves with enhanced copper pour and thermal vias. At 4.2 mA per amplifier (16.8 mA total) and ±15 V supplies, power dissipation reaches 504 mW - resulting in a ~45°C junction-to-ambient rise at 50°C ambient, yielding a junction temperature of ~95°C, well within the 150°C absolute maximum rating. AD8674ARZ thermal performance is validated for continuous industrial operation.
How does the AD8674ARZ compare to the AD8672 in terms of temperature range and channel count?
The AD8674ARZ is a quad-channel amplifier rated for –40°C to +85°C operation, whereas the AD8672 is a dual-channel device rated for the extended industrial range of –40°C to +125°C. Both share identical core specifications - 2.8 nV/√Hz noise, 10 MHz GBW, 75 µV max offset - but differ in channel density and thermal qualification. The AD8674ARZ's lower max temperature reflects its 14-lead SOIC packaging and internal thermal derating for four active cores. For designs requiring >+85°C operation with quad functionality, the AD8674ARZ is not suitable; instead, two AD8672ARZ devices may be used with careful layout matching. AD8674ARZ targets space-constrained, high-channel-count applications below +85°C.
Is the AD8674ARZ pin-compatible with other quad op amps like the OP497 or AD704?
No, the AD8674ARZ is not pin-compatible with OP497 or AD704. Its 14-lead SOIC_N (R-14) pinout - with V+ on pin 4, V– on pin 11, and interleaved input/output assignments - differs fundamentally from the 14-lead DIP/SOIC layouts of OP497 (V+ on pin 14, V– on pin 4) and AD704 (V+ on pin 7, V– on pin 4). Substituting AD8674ARZ into an OP497 or AD704 footprint would cause immediate supply reversal and device damage. Any replacement requires full schematic and layout revision. AD8674ARZ pinout is unique to the AD867x family and must be implemented per Figure 3 in the Rev. F datasheet.
AD8674ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 3 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 3mA (x4 Channels)
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
AD8674ARZ FAQ
1.How can I place an order for AD8674ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8674ARZ 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 AD8674ARZ reliable?
The price and inventory of AD8674ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8674ARZ is usually 5 days.
3.What payment methods are accepted for AD8674ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8674ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8674ARZ?
AD8674ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8674ARZ 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 AD8674ARZ?
For technical support, including AD8674ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8674ARZ requirements.
6.How does Aetrix verify that AD8674ARZ is sourced from the original manufacturer or authorized distributors?
All AD8674ARZ 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 AD8674ARZ meets industry standards.
7.What is the process for return or replacement of AD8674ARZ?
All AD8674ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8674ARZ, 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 AD8674ARZ part is unused and in its original packaging.
Return procedure for AD8674ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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