AD8629ARZ - Zero-Drift Dual Op Amp | Analog Devices
MPN: AD8629ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.38 | $2.38 |
| 10 | $2.14 | $21.40 |
| 100 | $1.9 | $190.00 |
| 500 | $1.71 | $855.00 |
| 1,000 | $1.55 | $1,550.00 |
Drop-in alternatives for AD8629ARZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD8629ARZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD8628ARZ
✅ Drop-In✓ In Stock
$1 / Unit
View Datasheet →AD8630ARZ
✅ Drop-In📋 Reference alternative (not in catalog)
MS8629
✅ Drop-In📋 Reference alternative (not in catalog)
OPA2189
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2051
✅ Drop-In📋 Reference alternative (not in catalog)
AD8629ARZ Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Supply Voltage Range | 2.7 V to 5 V |
| Offset Voltage | 1 µV |
| Offset Drift | 0.002 µV/°C |
| Input Bias Current | 100 pA max |
| Gain Bandwidth Product | [DATA_NEEDED: Gain Bandwidth Product] |
| Slew Rate | [DATA_NEEDED: Slew Rate] |
| CMRR | 130 dB |
| PSRR | 130 dB |
| Rail-to-Rail Input | Yes |
| Rail-to-Rail Output | Yes |
| Noise | Low (specific value [DATA_NEEDED: Noise Density]) |
| Package | 8-SOIC |
| Operating Temperature Range | -40°C to +125°C |
| RoHS Status | Compliant |
AD8629ARZ Pin Configuration
| Pin 1 | OUT A — Output of amplifier A |
| Pin 2 | -IN A — Inverting input of amplifier A |
| Pin 3 | +IN A — Non-inverting input of amplifier A |
| Pin 4 | V- — Negative supply (ground in single-supply) |
| Pin 5 | +IN B — Non-inverting input of amplifier B |
| Pin 6 | -IN B — Inverting input of amplifier B |
| Pin 7 | OUT B — Output of amplifier B |
| Pin 8 | V+ — Positive supply |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AD8629ARZ is suitable for 6 applications: Precision Instrumentation, Medical Monitoring, Sensor Conditioning, Data Acquisition Systems, Battery-Powered Devices, Industrial Process Control.
Precision Instrumentation
The AD8629ARZ's ultra-low offset voltage (1 µV) and drift (0.002 µV/°C) make it ideal for precision instrumentation such as data acquisition systems and bridge amplifiers. Its rail-to-rail output maximizes ADC input range, and the high CMRR (130 dB) rejects common-mode noise. In a typical bridge amplifier, the AD8629ARZ amplifies small differential signals with minimal error, ensuring accurate measurements over temperature. The dual-channel configuration allows for simultaneous conditioning of multiple sensors, reducing component count and board space.
Recommended
Medical Monitoring
In medical devices like ECG and EEG monitors, the AD8629ARZ provides the low offset and drift needed for accurate biopotential signal conditioning. Its low input bias current (100 pA) minimizes errors when interfacing with high-impedance electrodes. The 2.7V to 5V supply range is compatible with battery-powered portable monitors. The rail-to-rail output allows direct interfacing with ADCs, and the high PSRR (130 dB) ensures stable performance despite power supply variations. The dual-channel design supports multi-lead measurements in a compact SOIC-8 package.
Recommended
Sensor Conditioning
The AD8629ARZ excels in conditioning signals from thermocouples, RTDs, and strain gauges. Its ultra-low offset and drift ensure accurate temperature and strain measurements over time. The high input impedance and low bias current prevent loading of high-impedance sensors. With rail-to-rail I/O, the amplifier can operate from a single 3.3V supply, simplifying design. The high CMRR rejects common-mode interference in noisy industrial environments. Dual channels allow for differential or multi-sensor configurations, making it a versatile choice for sensor interface circuits.
Recommended
Data Acquisition Systems
In data acquisition systems, the AD8629ARZ provides the precision needed to drive high-resolution ADCs. Its low offset and drift ensure accurate signal conditioning, while the rail-to-rail output maximizes the ADC's dynamic range. The high PSRR (130 dB) minimizes power supply noise coupling, preserving signal integrity. The dual-channel configuration allows simultaneous sampling of multiple channels, reducing system complexity. With a 2.7V to 5V supply range, it is compatible with modern low-voltage ADCs. The SOIC-8 package is ideal for space-constrained designs.
Recommended
Battery-Powered Devices
The AD8629ARZ's low supply voltage (2.7V) and low power consumption make it suitable for battery-powered devices such as portable instruments and wireless sensors. Its rail-to-rail I/O allows full signal swing from a single battery cell. The low offset and drift ensure accurate measurements over the battery's discharge cycle. The small SOIC-8 package minimizes board space, and the dual-channel design reduces component count. With a 5V maximum supply, it can also be used in 5V systems. The high PSRR ensures stable operation despite battery voltage fluctuations.
Recommended
Industrial Process Control
In industrial process control, the AD8629ARZ provides accurate signal conditioning for sensors like pressure transmitters and flow meters. Its ultra-low offset and drift ensure long-term stability, reducing calibration frequency. The high CMRR and PSRR reject noise from motors and power lines. The rail-to-rail output allows direct interface with industrial ADCs. The 2.7V to 5V supply range is compatible with common industrial logic levels. The dual-channel design supports redundant or differential measurements, enhancing system reliability. The SOIC-8 package is robust for industrial environments.
Recommended
Recommended Products Summary
Engineering reference data for AD8629ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8629ARZ-REEL7 | AD8628ARZ | MS8629 | OPA2189 | LTC2051 |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Hangzhou Ruimeng Technology | Texas Instruments | Analog Devices |
| Number of Channels | 2 | 2 | 1 | 2 | 2 | 2 |
| Offset Voltage | 1 µV | 1 µV | 1 µV | 1 µV | 4 µV | 0.5 µV |
| Offset Drift | 0.002 µV/°C | 0.002 µV/°C | 0.002 µV/°C | 0.002 µV/°C | 0.02 µV/°C | 0.01 µV/°C |
| Input Bias Current | 100 pA max | 100 pA max | 100 pA max | 100 pA max | 150 pA max | 25 pA max |
| CMRR | 130 dB | 130 dB | 130 dB | 130 dB | 140 dB | 130 dB |
| PSRR | 130 dB | 130 dB | 130 dB | 130 dB | 140 dB | 130 dB |
Key Differentiators
- Ultra-low offset voltage of 1 µV (vs OPA2189)
- Near-zero offset drift of 0.002 µV/°C (vs LTC2051)
- Dual-channel in SOIC-8 (vs AD8628ARZ)
Design Notes
The AD8629ARZ operates from 2.7V to 5V single supply. Use a 0.1 µF ceramic capacitor close to each supply pin to decouple high-frequency noise. For best performance, also add a 10 µF tantalum capacitor at the power entry point. Ensure the supply voltage does not exceed 5V to avoid damage.
For optimal noise performance, keep the feedback network resistors low in value (e.g., 1 kΩ to 10 kΩ) to minimize thermal noise. Place the amplifier close to the sensor or signal source to reduce trace inductance. Use a ground plane to minimize noise coupling. Avoid routing high-speed digital traces near the input pins.
Do not exceed the input common-mode range beyond the supply rails, as this may cause latch-up. Although the inputs are rail-to-rail, driving them beyond the rails can damage the device. Also, ensure the output is not shorted to ground for extended periods, as this can cause overheating. Use proper ESD precautions during handling.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.