AD8629ARZ - Zero-Drift Dual Op Amp | Analog Devices
MPN: AD8629ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.38 | $2.38 |
| 10 | $2.15 | $21.50 |
| 100 | $1.95 | $195.00 |
| 500 | $1.75 | $875.00 |
| 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:
AD8628ARZ
✅ Drop-In✓ In Stock
$1.49 / Unit
View Datasheet →AD8629ARZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
MS8629
✅ Drop-In📋 Reference alternative (not in catalog)
OPA2189
✅ 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 |
| CMRR | 130 dB |
| PSRR | 130 dB |
| Gain Bandwidth Product | [DATA_NEEDED: Gain Bandwidth Product] |
| Slew Rate | [DATA_NEEDED: Slew Rate] |
| Noise Density | [DATA_NEEDED: Noise Density] |
| Rail-to-Rail Input | Yes |
| Rail-to-Rail Output | Yes |
| 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 or ground |
| 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, Thermocouple and RTD Signal Conditioning, Medical Monitoring Devices, High-Accuracy Data Acquisition Systems, Battery-Powered Portable Equipment, Sensor Front-Ends.
Precision Instrumentation
The AD8629ARZ's ultra-low offset voltage (1 µV) and drift (0.002 µV/°C) make it ideal for precision instrumentation amplifiers. Its high CMRR (130 dB) rejects common-mode noise, ensuring accurate measurement of small differential signals. The rail-to-rail output maximizes dynamic range, and the low bias current (100 pA) minimizes loading on high-impedance sources. In a typical bridge amplifier configuration, the AD8629ARZ provides stable, accurate gain over temperature, making it suitable for strain gauges and pressure sensors.
Recommended
Thermocouple and RTD Signal Conditioning
The AD8629ARZ is well-suited for thermocouple and RTD signal conditioning due to its low offset and drift, which are critical for accurate temperature measurement. The low bias current (100 pA) reduces errors when interfacing with high-impedance sensors. The rail-to-rail input allows direct connection to sensor outputs near the supply rails. In a typical thermocouple amplifier, the AD8629ARZ amplifies the small thermoelectric voltage (µV range) with minimal error, and its high PSRR (130 dB) ensures stable operation in noisy industrial environments.
Recommended
Medical Monitoring Devices
In medical monitoring devices such as ECG and EEG systems, the AD8629ARZ provides the precision and low noise required for biopotential signal acquisition. Its ultra-low offset (1 µV) and drift (0.002 µV/°C) ensure stable baseline, while the high CMRR (130 dB) rejects common-mode interference from the body. The low bias current (100 pA) is essential for high-impedance electrodes. The rail-to-rail output allows direct interface with ADCs, and the 2.7V to 5V supply range is compatible with battery-powered portable monitors.
Recommended
High-Accuracy Data Acquisition Systems
The AD8629ARZ is ideal for high-accuracy data acquisition systems where precision and stability are paramount. Its low offset and drift ensure accurate signal conditioning over time and temperature, while the high CMRR and PSRR (130 dB) reject noise from power supplies and common-mode sources. The rail-to-rail output maximizes the ADC input range, and the low bias current (100 pA) minimizes errors when driving high-impedance sources. In a multi-channel DAQ system, the dual AD8629ARZ can condition two channels, reducing component count and board space.
Recommended
Battery-Powered Portable Equipment
The AD8629ARZ operates from a single 2.7V to 5V supply, making it ideal for battery-powered portable equipment. Its low power consumption extends battery life, while the rail-to-rail input and output maximize dynamic range at low supply voltages. The zero-drift architecture ensures accurate measurements even as the battery voltage declines. In portable sensor devices, the AD8629ARZ conditions signals from sensors with minimal power draw, and its small 8-SOIC package saves board space.
Recommended
Sensor Front-Ends
The AD8629ARZ excels as a sensor front-end amplifier due to its ultra-low offset, drift, and bias current. It is ideal for amplifying small signals from sensors such as strain gauges, pressure sensors, and photodiodes. The high CMRR (130 dB) rejects common-mode noise, and the rail-to-rail output allows direct connection to ADCs. The low bias current (100 pA) minimizes loading on high-impedance sensors, preserving signal integrity. In a typical sensor interface, the AD8629ARZ provides accurate, stable gain, ensuring reliable measurements.
Recommended
Recommended Products Summary
Engineering reference data for AD8629ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8628ARZ | AD8630ARZ | MS8629 | OPA2189 |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 14-SOIC | SOIC-8 | SOIC-8 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Hangzhou Ruimeng Technology | Texas Instruments |
| Number of Channels | 2 | 1 | 4 | 2 | 2 |
| Offset Voltage | 1 µV | 1 µV | 1 µV | [DATA_NEEDED] | 4 µV |
| Offset Drift | 0.002 µV/°C | 0.002 µV/°C | 0.002 µV/°C | [DATA_NEEDED] | 0.02 µV/°C |
| Input Bias Current | 100 pA max | 100 pA max | 100 pA max | [DATA_NEEDED] | 150 pA max |
| CMRR | 130 dB | 130 dB | 130 dB | [DATA_NEEDED] | 140 dB |
| PSRR | 130 dB | 130 dB | 130 dB | [DATA_NEEDED] | 140 dB |
Key Differentiators
- Ultra-low offset voltage of 1 µV (vs OPA2189)
- Ultra-low offset drift of 0.002 µV/°C (vs OPA2189)
- Dual channel in 8-SOIC package (vs AD8628ARZ)
Design Notes
The AD8629ARZ operates from a single 2.7V to 5V supply. Use a 0.1 µF ceramic capacitor close to each supply pin (V+ and V-) to decouple high-frequency noise. For best performance, a 10 µF tantalum capacitor in parallel is recommended for low-frequency stability.
Place the AD8629ARZ close to the signal source to minimize trace length and reduce noise pickup. Use a ground plane to provide a low-impedance return path. Keep feedback resistors and capacitors close to the inverting input to minimize parasitic capacitance and inductance.
Avoid driving the inputs beyond the supply rails, as this can cause latch-up. The input common-mode range includes both rails, but exceeding them may damage the device. Also, ensure the power supply is clean and well-regulated, as the high PSRR (130 dB) helps, but excessive noise can still affect performance.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
