AD8429ARZ - 1nV/√Hz Ultra-Low Noise In-Amp | Analog Devices
MPN: AD8429ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.5 | $5,500.00 |
Drop-in alternatives for AD8429ARZ — 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:
AD8429BRZ
✅ Drop-In✓ In Stock
$6.85 / Unit
View Datasheet →AD8429ARZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
AD8429BRZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
AD8221ARZ
✅ Drop-In✓ In Stock
$3.29 / Unit
View Datasheet →AD620ARZ
✅ Drop-In✓ In Stock
$7.2 / Unit
View Datasheet →AD8429ARZ Maximum Ratings & Electrical Characteristics
| Device Type | Instrumentation Amplifier |
| Number of Channels | 1 |
| Input Voltage Noise | 1 nV/√Hz |
| CMRR (Minimum) | 140 dB |
| Gain (Fixed) | 2000 |
| Gain Drift | 5 ppm/°C |
| Offset Drift | 0.3 µV/°C |
| Gain Accuracy | 0.05% |
| 3 dB Bandwidth | 15 MHz |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-SOIC |
| Mounting Style | Surface Mount |
| Number of Pins | 8 |
| RoHS Status | Compliant |
| Supply Voltage Range | [DATA_NEEDED: Supply voltage range] |
AD8429ARZ Pin Configuration
| Pin 1 | -IN — Inverting input |
| Pin 2 | RG — Gain setting resistor connection |
| Pin 3 | RG — Gain setting resistor connection |
| Pin 4 | -VS — Negative supply |
| Pin 5 | REF — Reference voltage for level shifting |
| Pin 6 | OUT — Output |
| Pin 7 | +VS — Positive supply |
| Pin 8 | +IN — Non-inverting input |
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
AD8429ARZ is suitable for 6 applications: Precision Data Acquisition, Medical Instrumentation (ECG/EEG), Strain Gauge and Bridge Amplifiers, Industrial Process Control, Audio Test and Measurement, Vibration Monitoring.
Precision Data Acquisition
The AD8429ARZ's ultralow noise of 1 nV/√Hz and high CMRR of 140 dB make it ideal for precision data acquisition systems. It accurately amplifies small sensor signals while rejecting common-mode noise, ensuring high-resolution measurements. The wide temperature range of -40°C to +125°C allows use in industrial environments. Its fixed gain of 2000 simplifies design, and the REF pin enables level shifting for single-supply ADCs.
Recommended
Medical Instrumentation (ECG/EEG)
In medical instrumentation like ECG and EEG, the AD8429ARZ excels due to its ultralow noise and high CMRR, which are critical for capturing microvolt-level biopotential signals. The 1 nV/√Hz noise ensures minimal signal degradation, while the 140 dB CMRR rejects 50/60 Hz power line interference. The wide temperature range and small SOIC package make it suitable for portable and wearable devices. The REF pin allows easy level shifting for single-supply operation.
Recommended
Strain Gauge and Bridge Amplifiers
The AD8429ARZ is well-suited for strain gauge and bridge amplifier applications due to its high gain accuracy of 0.05% and low offset drift of 0.3 µV/°C. It provides precise amplification of bridge outputs, which are typically in the millivolt range. The high CMRR of 140 dB rejects common-mode voltages from the bridge supply, ensuring accurate measurements. Its wide temperature range makes it ideal for industrial load cells and pressure sensors.
Recommended
Industrial Process Control
In industrial process control, the AD8429ARZ provides reliable amplification of sensor signals in harsh environments. Its operating temperature range of -40°C to +125°C ensures performance in extreme conditions. The high CMRR of 140 dB rejects interference from motors and power lines, while the low noise of 1 nV/√Hz preserves signal integrity. The fixed gain of 2000 simplifies calibration, and the device's robustness makes it suitable for 4-20 mA loop transmitters.
Recommended
Audio Test and Measurement
The AD8429ARZ's ultralow noise and high bandwidth of 15 MHz make it suitable for audio test and measurement equipment. It can accurately amplify low-level audio signals without adding significant noise, preserving the dynamic range. The high CMRR ensures rejection of common-mode hum and interference. The device's precision and stability make it ideal for audio analyzers and distortion measurement systems.
Recommended
Vibration Monitoring
For vibration monitoring, the AD8429ARZ provides the low noise and high CMRR needed to amplify signals from piezoelectric accelerometers. The 1 nV/√Hz noise ensures that small vibrations are not masked, while the 140 dB CMRR rejects interference from machinery. The wide temperature range allows deployment in industrial settings. The fixed gain of 2000 simplifies signal conditioning, and the REF pin enables interface with single-supply ADCs.
Recommended
Recommended Products Summary
Engineering reference data for AD8429ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8429BRZ | AD8221ARZ | AD620ARZ |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Input Voltage Noise | 1 nV/√Hz | 1 nV/√Hz | 8 nV/√Hz | 9 nV/√Hz |
| CMRR (Minimum) | 140 dB | 140 dB | 90 dB | 100 dB |
| Gain | 2000 (fixed) | 2000 (fixed) | 1 to 1000 (set by resistor) | 1 to 1000 (set by resistor) |
| 3 dB Bandwidth | 15 MHz | 15 MHz | 825 kHz | 120 kHz |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | -40°C to +85°C | -40°C to +85°C |
| Supply Voltage Range | [DATA_NEEDED] | [DATA_NEEDED] | ±2.3 V to ±18 V | ±2.3 V to ±18 V |
Key Differentiators
- Ultralow input voltage noise of 1 nV/√Hz (vs AD8221ARZ)
- High CMRR of 140 dB minimum (vs AD620ARZ)
- Wide temperature range of -40°C to +125°C (vs AD8221ARZ)
Design Notes
For optimal noise performance, use a solid ground plane and keep input traces short and shielded. Place decoupling capacitors (0.1 µF and 10 µF) close to the supply pins. Avoid routing digital signals near the input pins to prevent coupling.
The REF pin must be driven with a low-impedance source (<1 Ω) to maintain CMRR. Do not exceed the REF pin voltage beyond ±0.3 V of the supplies, as it is protected with ESD diodes. Ensure input voltages stay within the common-mode range to avoid output saturation.
The AD8429ARZ in an 8-SOIC package has a typical thermal resistance (θJA) of around 100°C/W. For high supply voltages and output currents, ensure adequate PCB copper area for heat dissipation. In most precision measurement applications, power dissipation is low, but verify worst-case conditions.
Compliance Information
RoHS compliant per distributor data. No AEC-Q100 qualification indicated.
