Part A
AD8622ARZ
Công ty 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 AD8626ARZ and AD8622ARZ are both dual, precision, low-power operational amplifiers in the same SOIC-8 package with identical pinouts, making them strong functional replacement candidates. The AD8626ARZ offers higher gain bandwidth and slew rate for more demanding signal conditioning, while the AD8622ARZ delivers lower input bias current and lower voltage noise for high-impedance and low-noise applications. Designers should validate supply range, input common-mode headroom, and capacitive-load stability against the target circuit before finalizing the substitution.
Package and Pinout
High match
Supply Voltage Range
High match
Gain Bandwidth Product
Validation required
Input Bias Current and Noise
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 | AD8626ARZ | AD8622ARZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 2 | Both are dual op-amps, so channel count is compatible for direct substitution in dual-channel designs. |
| Input Offset Voltage (Max) | 50 µV | 125 µV | Lower offset voltage improves DC precision; AD8626 offers tighter offset, which matters for high-accuracy signal chains. |
| Input Bias Current (Typ) | 1 pA | 1 pA | Ultra-low bias current suits high-impedance sensor and photodiode front-ends; both are equivalent here. |
| Gain Bandwidth Product | 5 MHz | 2.5 MHz | Higher GBW allows wider closed-loop bandwidth and faster settling; AD8626 supports higher-frequency signals. |
| Slew Rate | 5 V/µs | 2.5 V/µs | Slew rate limits large-signal response speed; AD8626 handles faster transients and larger steps. |
| Supply Voltage Range | 5 V to 26 V (±2.5 V to ±13 V) | 5 V to 30 V (±2.5 V to ±15 V) | Wider supply range offers more headroom for higher-voltage systems; AD8622 tolerates higher rails. |
| Supply Current per Amplifier (Typ) | 0.9 mA | 0.55 mA | Lower quiescent current extends battery life; AD8622 is more power-efficient in portable designs. |
| Input Voltage Noise Density (1 kHz) | 16 nV/√Hz | 22 nV/√Hz | Lower noise density improves SNR in low-level signal amplification; AD8626 is quieter. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical industrial temperature range ensures both are suitable for the same environmental conditions. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package and pinout allow drop-in board replacement without layout changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8622ARZ | AD8626ARZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | General Purpose | J-FET |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 0.48V/µs | 5V/µs |
| Gain Bandwidth Product | 560 kHz | 5 MHz |
| Current - Input Bias | 45 pA | 0.25 pA |
| Voltage - Input Offset | 10 µV | 350 µV |
| Supply Current | 215µA (x2 Channels) | 710µA (x2 Channels) |
| Current - Output / Channel | 40 mA | 15 mA |
| Voltage - Supply Span(Min) | 5 V | 5 V |
| Voltage - Supply Span(Max) | 30 V | 26 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the AD8626ARZ and AD8622ARZ operational amplifiers?
The AD8626ARZ is a dual, precision, low-power JFET-input operational amplifier, while the AD8622ARZ is a dual, precision, low-power, rail-to-rail output operational amplifier. The AD8626ARZ features JFET inputs with very low input bias current, whereas the AD8622ARZ uses a different input architecture optimized for low offset voltage and rail-to-rail output swing. Both are offered in 8-lead SOIC packages.
Are the AD8626ARZ and AD8622ARZ pin-compatible in the SOIC-8 package?
Yes, both devices are offered in an 8-lead SOIC package with the same standard dual op-amp pinout: Pin 1 = OUT A, Pin 2 = -IN A, Pin 3 = +IN A, Pin 4 = V-, Pin 5 = +IN B, Pin 6 = -IN B, Pin 7 = OUT B, Pin 8 = V+. This pin configuration is consistent with the standard dual operational amplifier SOIC-8 footprint.
How do the input bias currents of the AD8626ARZ and AD8622ARZ compare?
The AD8626ARZ, with its JFET input stage, offers very low input bias current, typically in the picoampere range, making it suitable for high-impedance sensor interfaces. The AD8622ARZ has a bipolar input stage with input bias current in the nanoampere range. Designers should consult the respective datasheets for exact specified limits over temperature.
Which device is better suited for low-voltage single-supply applications?
Both devices support single-supply operation. The AD8622ARZ features rail-to-rail output swing, which maximizes dynamic range in low-voltage single-supply designs. The AD8626ARZ also operates on single supplies but its output swing characteristics differ. The AD8622ARZ is generally preferred when rail-to-rail output performance is critical at low supply voltages.
Do the AD8626ARZ and AD8622ARZ share the same operating temperature range?
Both the AD8626ARZ and AD8622ARZ are specified for the industrial temperature range of -40°C to +125°C, as indicated by the "A" grade and "RZ" SOIC package designation in their part numbers. Designers should verify the exact temperature specifications in the respective manufacturer datasheets.
Can the AD8622ARZ be used as a drop-in replacement for the AD8626ARZ?
Although both devices share the same SOIC-8 pinout, they are not electrically identical. The AD8626ARZ has JFET inputs with ultra-low bias current, while the AD8622ARZ has different input characteristics and rail-to-rail output. A direct substitution requires verification of input bias current, offset voltage, noise, and output swing requirements against the specific application circuit.
What are the typical supply voltage ranges for the AD8626ARZ and AD8622ARZ?
Both the AD8626ARZ and AD8622ARZ are specified for operation from dual supplies of ±2.5 V to ±15 V, or single supplies of 5 V to 30 V. Designers should confirm the exact minimum and maximum supply voltage ratings in the manufacturer datasheets before finalizing the design.