Part A
AD8626ARMZ
ADI公司
- Lifecycle
- Active
- Stock
- 1213 件
- Package
- TSSOP-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 AD8629ARMZ and AD8626ARMZ are both zero-drift, rail-to-rail operational amplifiers in the same 8-lead MSOP package, sharing identical pinout and supply voltage range, making the AD8629ARMZ a viable functional replacement candidate for the AD8626ARMZ in most applications. However, designers should validate bandwidth, quiescent current, and noise performance against their specific circuit requirements before substituting.
Package Type
High match
Pin Configuration
High match
Gain Bandwidth Product
Validation required
Supply Current
Validation required
Parts at a glance
Part B
AD8629ARMZ
ADI公司
- Lifecycle
- Active
- Stock
- 3786 件
- Package
- TSSOP-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 | AD8629ARMZ | AD8626ARMZ | 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 designs. |
| Input Offset Voltage (Max) | 5 µV | 250 µV | AD8629 is a precision zero-drift amplifier with far lower offset, critical for high-accuracy DC signal chains; AD8626 is not precision-grade. |
| Input Offset Voltage Drift (Max) | 0.02 µV/°C | 2 µV/°C | AD8629's near-zero drift suits precision instrumentation over temperature; AD8626 drifts significantly more. |
| Input Bias Current (Typ) | 30 pA | 1 pA | Both are CMOS-input with very low bias current; AD8626 is slightly lower, relevant for high-impedance sensor interfaces. |
| Gain Bandwidth Product | 2.5 MHz | 5 MHz | AD8626 offers roughly double the bandwidth, affecting achievable closed-loop speed and settling in signal conditioning. |
| Slew Rate | 1 V/µs | 5 V/µs | AD8626 slews five times faster, enabling larger/faster signal swings without slew-induced distortion. |
| Supply Voltage Range | 2.7 V to 5 V (single) / ±1.35 V to ±2.5 V (dual) | 5 V to 26 V (single) / ±2.5 V to ±13 V (dual) | AD8629 is a low-voltage part while AD8626 supports much higher supplies; this is a major compatibility constraint for substitution. |
| Supply Current per Amplifier (Typ) | 0.85 mA | 0.9 mA | Quiescent current is similar, so power budget impact is comparable between the two parts. |
| Input Voltage Noise Density (1 kHz, Typ) | 22 nV/√Hz | 16 nV/√Hz | AD8626 has lower voltage noise, beneficial for low-noise amplification; AD8629 trades noise for precision and zero-drift. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | AD8629 is rated for a wider temperature range, making it suitable for harsher environments where AD8626 is not specified. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8626ARMZ | AD8629ARMZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | J-FET | Zero-Drift |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 5V/µs | 1V/µs |
| Gain Bandwidth Product | 5 MHz | 2.5 MHz |
| Current - Input Bias | 0.25 pA | 30 pA |
| Voltage - Input Offset | 350 µV | 1 µV |
| Supply Current | 710µA (x2 Channels) | - |
| Current - Output / Channel | 15 mA | 30 mA |
| Voltage - Supply Span(Min) | 5 V | 2.7 V |
| Voltage - Supply Span(Max) | 26 V | 5 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| -3 dB Bandwidth | - | 2.5 MHz |
Frequently asked questions
What are the key differences between the AD8629ARMZ and AD8626ARMZ operational amplifiers?
The AD8629ARMZ is a dual zero-drift, single-supply operational amplifier featuring very low offset voltage (1 µV typical), low input bias current, and rail-to-rail input/output operation. The AD8626ARMZ is a dual low-power, low-noise, rail-to-rail output operational amplifier with a 5 MHz gain bandwidth product and 2.5 V/µs slew rate. The AD8629 is optimized for precision DC applications requiring ultra-low offset and drift, while the AD8626 is optimized for low-power AC signal conditioning with lower noise.
Are the AD8629ARMZ and AD8626ARMZ pin-compatible in the MSOP-8 package?
Both devices are offered in an 8-lead MSOP (RMZ) package with the same standard dual op-amp pinout: pin 1 and pin 7 as outputs, pins 2 and 3 as inverting and non-inverting inputs of amplifier A, pins 5 and 6 as inputs of amplifier B, and pins 4 and 8 as the negative and positive supply pins. This common pinout allows the devices to be used on the same PCB footprint, but electrical differences must still be validated for the target design.
How do the supply voltage ranges of the AD8629ARMZ and AD8626ARMZ compare?
The AD8629ARMZ operates from a single supply of 2.7 V to 5 V (or dual supplies of ±1.35 V to ±2.5 V). The AD8626ARMZ operates from a single supply of 2.7 V to 5 V (or dual supplies of ±1.35 V to ±2.5 V). Both devices are specified for single-supply operation over the same nominal range, making them suitable for 3 V and 5 V systems.
Which device is better suited for precision DC instrumentation applications?
The AD8629ARMZ is better suited for precision DC instrumentation because it is a zero-drift amplifier with very low offset voltage (1 µV typical) and extremely low offset voltage drift (0.005 µV/°C typical), along with low input bias current. The AD8626ARMZ has higher offset voltage and drift specifications and is intended for low-power, low-noise AC applications rather than ultra-precision DC signal chains.
How do the noise characteristics of the AD8629ARMZ and AD8626ARMZ differ?
The AD8626ARMZ is specified with low voltage noise density of approximately 8 nV/√Hz at 1 kHz, making it suitable for low-noise signal conditioning. The AD8629ARMZ, while a zero-drift precision amplifier, has higher broadband voltage noise density (approximately 22 nV/√Hz at 1 kHz) but very low 0.1 Hz to 10 Hz noise. Selection depends on whether low broadband noise or ultra-low offset and drift is the dominant requirement.
What are the gain bandwidth and slew rate specifications for each device?
The AD8626ARMZ has a gain bandwidth product of 5 MHz and a slew rate of 2.5 V/µs. The AD8629ARMZ has a gain bandwidth product of 2.5 MHz and a slew rate of 1.0 V/µs. The AD8626 therefore offers higher AC bandwidth and faster transient response, while the AD8629 prioritizes DC precision.
Can the AD8629ARMZ and AD8626ARMZ be used interchangeably in an existing design?
They should not be treated as drop-in interchangeable without validation. Although both are dual op-amps in the same MSOP-8 pinout and share a 2.7 V to 5 V supply range, they differ in offset voltage, offset drift, noise density, gain bandwidth, and slew rate. A substitution must be verified against the manufacturer datasheets for the specific circuit's DC accuracy, noise, stability, and AC performance requirements.