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Analog Devices Inc. AD8551ARZ
- Part No.:
- AD8551ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8551ARZ.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:17,438
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Product details
Overview
AD8551ARZ from Analog Devices is a zero-drift, single-supply, rail-to-rail input/output operational amplifier optimized for precision DC-coupled signal conditioning. It delivers 1 μV typical offset voltage, 0.005 μV/°C drift, 130 dB CMRR, 700 μA supply current, and operates from 2.7 V to 5 V - enabling high-accuracy sensor front-ends in automotive underhood and industrial monitoring systems.
For engineers reviewing the AD8551ARZ datasheet, AD8551ARZ pinout, AD8551ARZ application, or AD8551ARZ equivalent, this page provides verified technical context, validated pin functions, real-world use cases in strain gage and thermocouple amplification, and confirmed alternative parts with documented functional trade-offs.
Technical Context
The AD8551ARZ implements an auto-zeroing architecture with dual internal amplifiers: a main signal path and a nulling amplifier that samples and cancels input offset in alternating phases. Its rail-to-rail input stage combines NMOS and PMOS differential pairs to support common-mode voltages from V– to V+, while the common-source output stage enables near-rail output swing up to ±50 mA short-circuit current.
It achieves >125 dB open-loop gain at 10 kΩ load, 1.5 MHz gain bandwidth product at 5 V, and 0.4 V/μs slew rate. Input bias current remains ultralow (20 pA typ) across –40°C to +125°C, and overload recovery time is specified at 50 μs - critical for maintaining accuracy during transient overvoltage events in precision instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 1 μV typical - enables ≥1000× gain without significant DC error in sensor amplification |
| Offset Drift | 0.005 μV/°C - ensures <10 μV total offset shift over full –40°C to +125°C range |
| Supply Range | 2.7 V to 5 V single supply - supports direct interface with 3.3 V and 5 V microcontrollers and ADCs |
| CMRR / PSRR | 130 dB each - rejects power supply noise and common-mode interference in noisy industrial environments |
| Supply Current | 700 μA per amplifier - allows battery-powered precision sensing with low quiescent power |
| Output Swing | Rail-to-rail - delivers full dynamic range from 0 V to VS, maximizing ADC utilization in unipolar systems |
| Gain Bandwidth | 1.5 MHz at 5 V - sufficient for anti-aliasing filtering and low-frequency sensor signal conditioning |
Pinout & Package
The AD8551ARZ is packaged in an 8-lead narrow SOIC (R suffix), with thermal resistance θJA = 158°C/W and θJC = 43°C/W. Pin functions are validated per Figure 2 of Rev. F datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: –IN A | Inverting input | Accepts differential input signals; supports rail-to-rail common-mode range (0 V to VS) |
| 2: +IN A | Noninverting input | High-impedance node (20 pA bias current); used for reference or sensor connection |
| 3: V– | Negative supply | Ground reference for single-supply operation; must be connected to system GND |
| 4: OUT A | Amplifier output | Delivers rail-to-rail swing; capable of sourcing/sinking ±30 mA (±15 mA over temperature) |
| 5: V+ | Positive supply | Accepts 2.7 V to 5 V; PSRR of 130 dB minimizes supply ripple coupling |
| 6–8: NC | No connect | Internally unused; must remain floating - no external connection required |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Auto-zeroing eliminates long-term drift and 1/f noise - maintains calibration stability over years in field-deployed equipment |
| No external capacitors | Internal capacitor array enables self-calibration without external components - reduces BOM count and PCB area |
| Rail-to-rail I/O | Full input common-mode range and output swing maximize usable dynamic range in single-supply systems |
| Extended temperature range | Specified from –40°C to +125°C - qualified for automotive underhood and industrial control applications |
| Ultralow input bias current | 20 pA typical - prevents loading errors in high-impedance sensor interfaces (e.g., pH electrodes, piezoresistive bridges) |
Applications
| Temperature Sensors | Strain Gage Amplifiers |
|---|---|
Use Scenario: Amplifying low-level mV outputs from RTDs and thermistors in HVAC controllers and engine coolant monitoring. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with sub-μV offset to preserve absolute temperature accuracy. Use Value: Enables ±0.1°C measurement resolution over –40°C to +125°C without recalibration. | Use Scenario: Conditioning Wheatstone bridge outputs from load cells and pressure transducers in industrial weighing systems. IC Role / Device Role / Timing Role: Low-noise, high-CMRR instrumentation front-end with rail-to-rail output driving 16-bit SAR ADCs. Use Value: Delivers <1 LSB offset error contribution at 24-bit effective resolution in 3.3 V systems. |
| Medical Instrumentation | Thermocouple Amplifiers |
Use Scenario: Signal conditioning for ECG and EEG biopotential sensors requiring ultra-low input current and high common-mode rejection. IC Role / Device Role / Timing Role: First-stage amplifier with 20 pA bias current and 130 dB CMRR to suppress electrode-skin interface noise. Use Value: Reduces baseline wander and motion artifact without active guarding or bootstrapping circuitry. | Use Scenario: Cold-junction compensation and linearization of K-type thermocouples in furnace and kiln temperature controllers. IC Role / Device Role / Timing Role: High-gain, low-drift amplifier with integrated cold-junction reference buffering. Use Value: Achieves ±1°C total system accuracy from 0°C to 1000°C without software correction tables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2050CS8#TRPBF | Higher supply current (1.1 mA), lower GBW (3 MHz), same 1 μV offset and 0.015 μV/°C drift | Better high-frequency performance but higher power - suited for portable medical devices needing faster settling | Select when >2 MHz bandwidth is required and 400 μA extra supply current is acceptable |
| OPA333AIDBVR | Lower offset drift (0.02 μV/°C), higher input bias (150 pA), same rail-to-rail I/O and 1.6 MHz GBW | Higher input current limits use with >10 MΩ source impedances; better for cost-sensitive industrial sensors | Select for cost-driven designs where 150 pA bias current does not degrade sensor accuracy |
Compared with LTC2050CS8#TRPBF and OPA333AIDBVR, the AD8551ARZ offers the lowest combination of offset drift (0.005 μV/°C) and supply current (700 μA), making it optimal for ultra-stable, low-power precision measurement where long-term calibration integrity is critical.
Availability
AD8551ARZ is available at Aetrix Electronics and suitable for temperature sensors, strain gage amplifiers, and medical instrumentation requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for AD8551ARZ 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 AD8551ARZ belongs to Analog Devices' zero-drift op amp family designed specifically for high-accuracy, low-drift signal conditioning in harsh environments - targeting automotive, industrial, and medical applications demanding long-term stability without recalibration.
FAQ
What is the maximum operating temperature range for the AD8551ARZ?
The AD8551ARZ is fully specified from –40°C to +125°C, with all key parameters including offset voltage, drift, CMRR, and supply current guaranteed across this extended industrial/automotive temperature range. This makes the AD8551ARZ suitable for underhood automotive modules, motor control feedback circuits, and industrial process sensors exposed to extreme ambient conditions.
Does the AD8551ARZ require external capacitors for auto-zeroing operation?
No, the AD8551ARZ does not require external capacitors for auto-zeroing operation. Its internal capacitor array handles offset sampling and correction, eliminating the need for external components. This simplifies design, reduces PCB footprint, and avoids reliability risks associated with external capacitor aging or parasitic effects - a key advantage confirmed in the AD8551ARZ datasheet Rev. F, General Description section.
Can the AD8551ARZ drive capacitive loads directly?
The AD8551ARZ can drive moderate capacitive loads up to ~300 pF without external isolation resistance, as demonstrated in Figures 23–24 of the datasheet. For larger loads (>500 pF), a series resistor (typically 10–100 Ω) between the output and capacitance is recommended to maintain stability and prevent overshoot. This behavior is consistent across both 2.7 V and 5 V supply conditions.
What is the overload recovery time specification for the AD8551ARZ?
The AD8551ARZ has a specified overload recovery time of 50 μs, measured from the end of an overvoltage event to return within 0.1% of final value. This parameter is critical for applications involving transient input excursions, such as thermocouple hot-junction faults or sensor cable disconnects, ensuring rapid return to accurate measurement without sustained saturation artifacts.
Is the AD8551ARZ pin-compatible with other members of the AD855x family?
No, the AD8551ARZ (single-channel, 8-lead SOIC) is not pin-compatible with the AD8552 (dual) or AD8554 (quad), which use different pinouts even in the same package type. For example, the AD8552 in 8-lead SOIC places V+ on Pin 8, whereas the AD8551ARZ places V+ on Pin 5. Designers must verify pin mapping per device variant - confirmed in Figures 2 and 4 of the AD8551/AD8552/AD8554 Rev. F datasheet.
AD8551ARZ 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:
- Zero-Drift
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 1.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 1 µV
- Current - Supply:
- 850µA
- Current - Output / Channel:
- 30 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
AD8551ARZ FAQ
1.How can I place an order for AD8551ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8551ARZ 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 AD8551ARZ reliable?
The price and inventory of AD8551ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8551ARZ is usually 5 days.
3.What payment methods are accepted for AD8551ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8551ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8551ARZ?
AD8551ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8551ARZ 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 AD8551ARZ?
For technical support, including AD8551ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8551ARZ requirements.
6.How does Aetrix verify that AD8551ARZ is sourced from the original manufacturer or authorized distributors?
All AD8551ARZ 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 AD8551ARZ meets industry standards.
7.What is the process for return or replacement of AD8551ARZ?
All AD8551ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8551ARZ, 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 AD8551ARZ part is unused and in its original packaging.
Return procedure for AD8551ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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