Part A
AD8629ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2962 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8629ARZ is a strong functional replacement candidate for the AD8626ARZ, sharing the same dual op-amp configuration, SOIC-8 package, and comparable supply voltage range. Designers should validate bandwidth, noise, and temperature performance against the specific application requirements before final substitution.
Amplifier Configuration
High match
Package Type
High match
Gain Bandwidth Product
Validation required
Input Voltage Noise
Validation required
Parts at a glance
Part B
AD8626ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6117 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
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 | AD8629ARZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 2 (Dual) | Both are dual op-amps, so channel count is compatible for direct substitution in dual-channel circuits. |
| Input Offset Voltage (Max) | 50 µV | 1 µV | Lower offset voltage improves DC precision; AD8629 offers significantly better offset performance for high-accuracy signal chains. |
| Input Bias Current (Typ) | 1 pA | 30 pA | Very low bias current is critical for high-impedance sensor and photodiode applications; AD8626 has an advantage here. |
| Gain Bandwidth Product | 5 MHz | 2.5 MHz | GBW determines the maximum usable signal frequency; AD8626 supports wider bandwidth applications than AD8629. |
| Slew Rate | 5 V/µs | 1 V/µs | Higher slew rate enables faster large-signal response; AD8626 is better suited for higher-speed transient applications. |
| Supply Voltage Range | 5 V to 26 V (±2.5 V to ±13 V) | 2.7 V to 5 V (±1.35 V to ±2.5 V) | Operating voltage range must match the system supply; AD8626 supports higher-voltage rails while AD8629 targets low-voltage systems. |
| Supply Current per Amplifier (Typ) | 0.75 mA | 0.85 mA | Quiescent current affects power budget; both are low-power, with AD8626 slightly more efficient per amplifier. |
| Input Voltage Noise Density (Typ) | 16 nV/√Hz | 22 nV/√Hz | Lower noise density improves SNR in precision signal conditioning; AD8626 provides better noise performance. |
| Common-Mode Rejection Ratio (Typ) | 110 dB | 120 dB | Higher CMRR rejects common-mode interference better; AD8629 offers superior rejection for noisy environments. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package and pinout allow drop-in PCB substitution 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 | AD8629ARZ | AD8626ARZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Zero-Drift | J-FET |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 1V/µs | 5V/µs |
| Gain Bandwidth Product | 2.5 MHz | 5 MHz |
| -3 dB Bandwidth | 2.5 MHz | - |
| Current - Input Bias | 30 pA | 0.25 pA |
| Voltage - Input Offset | 1 µV | 350 µV |
| Current - Output / Channel | 30 mA | 15 mA |
| Voltage - Supply Span(Min) | 2.7 V | 5 V |
| Voltage - Supply Span(Max) | 5 V | 26 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Supply Current | - | 710µA (x2 Channels) |
Frequently asked questions
What are the key differences between the AD8626ARZ and AD8629ARZ operational amplifiers?
The AD8626ARZ is a dual, low-power, precision JFET-input op amp, while the AD8629ARZ is a dual, zero-drift, chopper-stabilized op amp. The AD8626 offers very low input bias current and low noise, making it suited for high-impedance sensor interfaces. The AD8629 provides extremely low offset voltage and offset drift over temperature, making it suited for precision DC applications. They differ in input architecture, offset performance, and noise characteristics.
Are the AD8626ARZ and AD8629ARZ pin-compatible in the SOIC-8 package?
Both devices are offered in an 8-lead SOIC package (ARZ suffix) with the standard dual op amp pinout: pin 1 and pin 7 as outputs, pins 2 and 6 as inverting inputs, pins 3 and 5 as non-inverting inputs, pin 4 as V−, and pin 8 as V+. This standard pinout allows them to share the same PCB footprint, but electrical differences must be validated before substitution.
Which device is better for precision DC applications, the AD8626ARZ or the AD8629ARZ?
The AD8629ARZ is generally preferred for precision DC applications because it is a zero-drift, chopper-stabilized amplifier with very low offset voltage and offset voltage drift over temperature. The AD8626ARZ, being a JFET-input amplifier, has higher offset voltage and offset drift than the AD8629, so the AD8629 is the stronger choice where DC accuracy and thermal stability are critical.
Which device is better for high-impedance sensor interfaces, the AD8626ARZ or the AD8629ARZ?
The AD8626ARZ is generally better suited for high-impedance sensor interfaces because its JFET input stage provides very low input bias current. The AD8629ARZ, with its chopper-stabilized architecture, has higher input bias current than the AD8626, which can introduce error in very high source-impedance applications. The AD8626 is therefore preferred where minimizing input bias current is the dominant requirement.
How do the noise characteristics of the AD8626ARZ and AD8629ARZ compare?
The AD8626ARZ is a low-noise JFET-input amplifier designed for low voltage noise, making it suitable for audio and low-level signal amplification. The AD8629ARZ, as a chopper-stabilized amplifier, has low offset and low 1/f noise but its chopping architecture can produce switching artifacts at its chopping frequency. The AD8626 is generally preferred where low broadband voltage noise is the priority, while the AD8629 is preferred where low offset and low drift are the priority.
Can the AD8629ARZ directly replace the AD8626ARZ in an existing design?
A direct replacement should only be made after validating all electrical differences against the manufacturer datasheets. Although both are dual op amps in the same SOIC-8 pinout, they differ in input bias current, offset voltage, offset drift, noise, and chopping behavior. Circuits sensitive to input bias current or high-frequency noise may require redesign, while circuits requiring low offset drift may benefit from the AD8629ARZ.
What are the supply voltage and operating temperature considerations for the AD8626ARZ and AD8629ARZ?
Both the AD8626ARZ and AD8629ARZ are specified for operation on dual supplies in the ±2.5 V to ±15 V range (or equivalent single-supply ranges) and are rated for the industrial temperature range of −40 °C to +125 °C. Designers should confirm the exact supply and temperature limits in the respective manufacturer datasheets, as guaranteed specifications may vary across the operating range.