Part A
AD822AR
ADI公司
- Lifecycle
- Active
- Stock
- 6939 件
- Package
- SOIC-8
- Series
- 線性放大器-儀器、運算放大器、緩衝放大器
Replacement verdict
Compatible functional replacement candidate
The AD8226ARZ-R7 and AD822AR are both instrumentation amplifiers from Analog Devices in the same SOIC-8 package, but they differ in supply range, gain flexibility, and bandwidth. The AD8226ARZ-R7 offers a wider supply span and rail-to-rail output with a single external resistor gain setting, while the AD822AR provides fixed gain options with higher bandwidth. Designers should validate gain configuration, supply headroom, and dynamic performance before substituting one for the other in a given circuit.
Amplifier Type
Validation required
Package Type
Validation required
Supply Voltage Range
Not compatible
Gain Configuration
Not compatible
Parts at a glance
Part B
AD8226ARZ-R7
ADI公司
- Lifecycle
- Active
- Stock
- 5908 件
- Package
- SOIC-8
- Series
- 線性放大器-儀器、運算放大器、緩衝放大器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8226ARZ-R7 | AD822AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 1 | 2 | Determines how many independent amplifier channels are available in a single package, directly affecting circuit architecture and channel count. |
| Amplifier Type | Instrumentation Amplifier | General Purpose Op-Amp (JFET input) | Instrumentation amps offer integrated differential gain with high CMRR, while general-purpose op-amps require external resistor networks for similar functionality. |
| Input Offset Voltage (max) | 150 µV | 800 µV | Lower offset voltage improves DC accuracy, which is critical for precision signal conditioning and low-level measurement applications. |
| Input Bias Current (typ) | 10 nA | 2 pA | Bias current affects error in high-impedance source applications; JFET-input op-amps offer far lower bias current than bipolar instrumentation amps. |
| Gain Bandwidth Product | 1.5 MHz | 1.9 MHz | GBW determines the maximum usable frequency for a given closed-loop gain and thus the bandwidth of the signal chain. |
| Supply Voltage Range | ±2.2 V to ±18 V (2.7 V to 36 V) | ±4.5 V to ±18 V (9 V to 36 V) | The usable supply range determines compatibility with low-voltage single-supply systems versus traditional dual-supply designs. |
| Input Common-Mode Voltage Range | Rail-to-rail (extends to supply rails) | Within supply rails (not rail-to-rail) | Wider common-mode range allows signals near the supply rails to be amplified, improving headroom in single-supply and sensor-interface designs. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Package and footprint compatibility affects whether the parts can be dropped into the same PCB layout. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | The temperature range determines suitability for industrial or automotive environments versus commercial-grade applications. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD822AR | AD8226ARZ-R7 |
|---|---|---|
| Part Status | Obsolete | Active |
| Amplifier Type | General Purpose | Instrumentation |
| Number of Circuits | 2 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 3V/µs | 0.6V/µs |
| Gain Bandwidth Product | 1.9 MHz | - |
| -3 dB Bandwidth | 1.9 MHz | 1.5 MHz |
| Current - Input Bias | 2 pA | 20 nA |
| Voltage - Input Offset | 400 µV | 100 µV |
| Supply Current | 1.24mA | 350µA |
| Current - Output / Channel | 20 mA | 13 mA |
| Voltage - Supply Span(Min) | 5 V | 2.2 V |
| Voltage - Supply Span(Max) | 30 V | 36 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the AD8226ARZ-R7 and the AD822AR?
The AD8226ARZ-R7 is an instrumentation amplifier designed for precision signal conditioning with a rail-to-rail output and a wide supply range of 2.7 V to 36 V. The AD822AR is a dual, low-power, general-purpose operational amplifier featuring a rail-to-rail output and a supply range of 2.7 V to 36 V (or ±1.35 V to ±18 V). The AD8226 is optimized for differential signal amplification with a single external resistor gain setting, while the AD822AR is a dual op-amp intended for general-purpose signal processing.
Are the AD8226ARZ-R7 and AD822AR pin-compatible in the SOIC-8 package?
No. The AD8226ARZ-R7 in an 8-lead SOIC uses the standard instrumentation amplifier pinout (including gain-setting resistor pins and a reference pin), whereas the AD822AR in an 8-lead SOIC uses the standard dual op-amp pinout (two amplifiers with shared power pins). The pin functions and PCB land patterns differ, so they are not direct drop-in replacements.
Can the AD8226ARZ-R7 be used as a direct substitute for the AD822AR in an existing dual op-amp circuit?
No. The AD8226ARZ-R7 is a single instrumentation amplifier, while the AD822AR contains two independent operational amplifiers. Substitution would require redesigning the circuit topology, pin mapping, and gain configuration, and is not a validated direct replacement per manufacturer documentation.
How do the gain configurations differ between the AD8226ARZ-R7 and the AD822AR?
The AD8226ARZ-R7 gain is set by a single external resistor connected between its RG pins, with a specified gain range of 1 to 1000. The AD822AR is a dual op-amp with no internal gain-setting pins; gain is determined entirely by external feedback resistor networks around each amplifier. The two devices therefore use fundamentally different gain-setting methods.
What are the supply voltage and quiescent current specifications for each device?
The AD8226ARZ-R7 operates from a single supply of 2.7 V to 36 V (or dual ±1.35 V to ±18 V) with a typical quiescent current of 350 µA. The AD822AR operates from 2.7 V to 36 V (or ±1.35 V to ±18 V) with a typical supply current of 1.5 mA for the dual amplifier. These values should be confirmed against the latest manufacturer datasheets for the specific grade and package.
Which device is better suited for precision differential signal acquisition?
The AD8226ARZ-R7 is specifically designed for precision differential signal acquisition, offering high common-mode rejection, a single-resistor gain setting, and rail-to-rail output, making it suitable for bridge and sensor interface applications. The AD822AR is a general-purpose dual op-amp and would require an external difference amplifier configuration to achieve comparable differential performance, with different error and CMRR characteristics.
Do both parts share the same operating temperature range?
Both the AD8226ARZ-R7 and the AD822AR are specified for the industrial temperature range of −40 °C to +125 °C in their standard grades. Designers should verify the exact temperature grade and package suffix against the manufacturer datasheet for the specific ordering part number.