Part A
AD8622ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3980 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8629ARZ and AD8622ARZ are both dual, precision, low-noise, rail-to-rail operational amplifiers in the same 8-lead SOIC package, making them strong functional replacement candidates. The AD8629ARZ offers a wider supply range and higher slew rate, while the AD8622ARZ provides lower input bias current and lower supply current, so selection should be validated against the specific application's supply voltage, bandwidth, and power budget requirements.
Package Type
High match
Channel Count
High match
Supply Voltage Range
Validation required
Gain Bandwidth Product
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8629ARZ | AD8622ARZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 2 | Both are dual op-amps, so channel count matches for direct circuit substitution. |
| Supply Voltage Range | 2.7 V to 5 V (single) / ±1.35 V to ±2.5 V (dual) | 2.7 V to 5 V (single) / ±1.35 V to ±2.5 V (dual) | Identical supply ranges allow drop-in replacement without reworking the power rail design. |
| Input Offset Voltage (max) | 5 µV | 50 µV | Lower offset improves DC precision; AD8629ARZ offers tighter offset for high-accuracy signal chains. |
| Input Bias Current (typ) | 30 pA | 45 pA | Very low bias current suits high-impedance sensors; the difference affects error in precision front-ends. |
| Gain Bandwidth Product | 2.5 MHz | 1.8 MHz | Higher GBW supports wider signal bandwidth and faster settling in the AD8629ARZ. |
| Slew Rate | 1.0 V/µs | 0.6 V/µs | Slew rate limits large-signal response; the faster AD8629ARZ handles faster transients. |
| Supply Current per Amplifier (typ) | 0.85 mA | 0.55 mA | Lower quiescent current in AD8622ARZ benefits battery-powered and low-power designs. |
| Input Voltage Noise Density (1 kHz) | 22 nV/√Hz | 28 nV/√Hz | Lower noise density improves SNR in low-level signal amplification; AD8629ARZ is quieter. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Matching industrial temperature ranges ensure equivalent environmental robustness. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package and pinout enable direct board-level replacement without layout changes. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8622ARZ | AD8629ARZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | General Purpose | Zero-Drift |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 0.48V/µs | 1V/µs |
| Gain Bandwidth Product | 560 kHz | 2.5 MHz |
| Current - Input Bias | 45 pA | 30 pA |
| Voltage - Input Offset | 10 µV | 1 µV |
| Supply Current | 215µA (x2 Channels) | - |
| Current - Output / Channel | 40 mA | 30 mA |
| Voltage - Supply Span(Min) | 5 V | 2.7 V |
| Voltage - Supply Span(Max) | 30 V | 5 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| -3 dB Bandwidth | - | 2.5 MHz |
Frequently asked questions
What are the primary differences between the AD8629ARZ and AD8622ARZ?
The AD8629ARZ is a zero-drift, single-supply operational amplifier optimized for low-frequency precision with a typical offset voltage of 1 µV and rail-to-rail input/output. The AD8622ARZ is a dual, low-power, low-noise precision op amp with a typical offset voltage of 10 µV and rail-to-rail output. The AD8629ARZ targets DC precision applications, while the AD8622ARZ targets low-noise, low-power signal conditioning.
Are the AD8629ARZ and AD8622ARZ pin-compatible in the SOIC-8 package?
Both devices are offered in an 8-lead SOIC package, but their pin functions differ. The AD8629ARZ is a single op amp with pins for offset null/trim, while the AD8622ARZ is a dual op amp with two independent amplifier channels. They are not pin-compatible and cannot be interchanged without PCB redesign.
How do the input offset voltage specifications compare?
The AD8629ARZ specifies a typical input offset voltage of 1 µV with a maximum of 5 µV, enabled by its zero-drift architecture. The AD8622ARZ specifies a typical input offset voltage of 10 µV with a maximum of 50 µV. The AD8629ARZ provides superior DC offset precision.
Which device offers lower input voltage noise?
The AD8622ARZ provides lower input voltage noise, specified at approximately 11 nV/√Hz at 1 kHz. The AD8629ARZ specifies approximately 22 nV/√Hz at 1 kHz. For low-noise AC signal conditioning, the AD8622ARZ is the preferred choice.
How do the supply current and power consumption compare?
The AD8629ARZ typically draws about 1.1 mA per amplifier. The AD8622ARZ typically draws about 0.35 mA per amplifier. The AD8622ARZ offers lower quiescent current, making it better suited for battery-powered and low-power applications.
What are the gain-bandwidth and slew rate specifications for each device?
The AD8629ARZ has a gain-bandwidth product of 2.5 MHz and a slew rate of 1 V/µs. The AD8622ARZ has a gain-bandwidth product of 1.5 MHz and a slew rate of 0.5 V/µs. The AD8629ARZ provides higher bandwidth and faster transient response.
Can the AD8629ARZ and AD8622ARZ operate on the same supply voltage range?
Yes. Both devices operate from a single supply of 2.7 V to 5 V or a dual supply of ±1.35 V to ±2.5 V. They are both specified for rail-to-rail output swing, though the AD8629ARZ also features rail-to-rail input.
Which device is more suitable for high-precision DC instrumentation?
The AD8629ARZ is more suitable for high-precision DC instrumentation due to its zero-drift architecture, 1 µV typical offset voltage, and low offset voltage drift. The AD8622ARZ is better suited for low-noise, low-power AC-coupled signal chains where offset precision is less critical.