AD620ARZ - Low Cost Low Power Instrumentation Amplifier | Analog Devices
MPN: AD620ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.44 | $11.44 |
| 10 | $10.3 | $103.00 |
| 100 | $9.15 | $915.00 |
| 500 | $8 | $4,000.00 |
| 1,000 | $7.2 | $7,200.00 |
Drop-in alternatives for AD620ARZ — 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:
AD620BRZ
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AD620AR
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INA128UA
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TPA1286-SO1R
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AD620ARZ Maximum Ratings & Electrical Characteristics
| Amplifier Type | Instrumentation Amplifier |
| Number of Circuits | 1 |
| Gain Range | 1 to 10,000 |
| Supply Voltage Range | ±2.3 V to ±18 V |
| Supply Current (Max) | 1.3 mA |
| CMRR at Gain 10 | 100 dB |
| Input Offset Voltage | 50 µV |
| Input Bias Current | 1.0 nA |
| Bandwidth at Gain 10 | 120 kHz |
| Voltage Noise Density at 1 kHz | 9 nV/√Hz |
| Input Impedance | 10 GΩ |
| Operating Temperature Range | -40°C to +85°C |
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
AD620ARZ Pin Configuration
| Pin 1 | RG — Gain setting resistor connection |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | REF — Reference voltage |
| Pin 6 | OUT — Output |
| Pin 7 | V+ — Positive supply |
| Pin 8 | RG — Gain setting resistor connection |
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
AD620ARZ is suitable for 6 applications: Medical Instrumentation (ECG/EEG), Industrial Process Control, Data Acquisition Systems, Transducer Interfaces, Portable Medical Devices, Weigh Scales and Load Cells.
Medical Instrumentation (ECG/EEG)
The AD620ARZ is ideal for ECG and EEG systems due to its low noise (9 nV/√Hz) and high CMRR (100 dB at gain 10). It amplifies tiny bioelectric signals while rejecting common-mode interference from the body and power lines. Its low supply current (1.3 mA) supports battery-operated portable monitors. The gain set by one resistor simplifies channel calibration. For multi-channel systems, multiple AD620ARZ can be used with a multiplexed ADC. The device's high input impedance (10 GΩ) prevents loading of electrode signals. Its small SOIC package enables compact PCB layouts in wearable devices.
Recommended
Industrial Process Control
In industrial settings, the AD620ARZ conditions signals from sensors like pressure transducers and thermocouples. Its wide supply range (±2.3V to ±18V) accommodates 24V industrial rails. The high CMRR rejects noise from motors and power lines. The gain resistor allows precise scaling of sensor outputs to match ADC input ranges. The device's industrial temperature range (-40°C to +85°C) ensures reliable operation in harsh environments. Its low drift maintains accuracy over temperature. The SOIC package is compatible with automated assembly for high-volume production.
Recommended
Data Acquisition Systems
The AD620ARZ is a front-end amplifier in data acquisition systems, providing gain and common-mode rejection before ADC conversion. Its low noise and high input impedance preserve signal integrity. The gain set by one resistor allows flexible scaling for various sensor types. The device's bandwidth of 120 kHz at gain 10 supports moderate-speed sampling. Its low power consumption is beneficial for multi-channel systems. The SOIC package allows dense board layouts. The AD620ARZ is often paired with high-resolution ADCs to achieve system accuracy.
Recommended
Transducer Interfaces
The AD620ARZ interfaces with various transducers, including strain gauges, load cells, and pressure sensors. Its high input impedance (10 GΩ) minimizes loading on bridge circuits. The low offset voltage (50 µV) reduces measurement error. The gain resistor allows precise calibration of full-scale output. The device's low noise ensures accurate detection of small signal changes. Its wide supply range supports both battery and line-powered systems. The SOIC package is suitable for compact sensor modules. The AD620ARZ's low power is ideal for remote sensors.
Recommended
Portable Medical Devices
The AD620ARZ is well-suited for portable medical devices like wearable heart rate monitors and glucose meters. Its low supply current (1.3 mA) extends battery life. The device operates from low supply voltages (±2.3V), compatible with 3V batteries. Its small SOIC package enables miniaturized designs. The high CMRR reduces interference from motion artifacts. The low noise ensures reliable signal detection. The gain set by one resistor simplifies design. The industrial temperature range covers body-worn applications.
Recommended
Weigh Scales and Load Cells
The AD620ARZ amplifies the small differential output of load cells in weigh scales. Its low offset voltage and drift ensure accurate weight measurements. The gain resistor sets the sensitivity to match the load cell's full-scale output. The high CMRR rejects common-mode noise from the bridge supply. The device's low noise improves resolution. Its wide supply range supports various power architectures. The SOIC package is suitable for compact scale electronics. The AD620ARZ's low power is beneficial for battery-operated scales.
Recommended
Recommended Products Summary
Engineering reference data for AD620ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD620BRZ | INA128UA | TPA1286-SO1R |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Texas Instruments | 3PEAK |
| Supply Voltage Range | ±2.3V to ±18V | ±2.3V to ±18V | ±2.25V to ±18V | [DATA_NEEDED] |
| Supply Current (Max) | 1.3 mA | 1.3 mA | 700 µA | [DATA_NEEDED] |
| CMRR at Gain 10 | 100 dB | 100 dB | 120 dB | [DATA_NEEDED] |
| Input Offset Voltage | 50 µV | 25 µV | 50 µV | [DATA_NEEDED] |
| Bandwidth at Gain 10 | 120 kHz | 120 kHz | 200 kHz | [DATA_NEEDED] |
| Voltage Noise Density | 9 nV/√Hz | 9 nV/√Hz | 8 nV/√Hz | [DATA_NEEDED] |
Key Differentiators
- Low supply current of 1.3 mA (vs INA128UA)
- High CMRR of 100 dB at gain 10 (vs INA128UA)
- Lower cost compared to AD620BRZ (vs AD620BRZ)
Design Notes
Place decoupling capacitors (0.1 µF) close to the V+ and V- pins to minimize power supply noise. Use a ground plane to reduce noise pickup. Keep input traces short and shielded to minimize interference. The gain resistor RG should be placed close to pins 1 and 8 to reduce parasitic capacitance and maintain accuracy.
Ensure the gain resistor RG is a precision resistor (1% or better) to maintain gain accuracy. Avoid running high-frequency digital traces near the input pins to prevent noise coupling. The reference pin (REF) should be bypassed with a capacitor to ground to reduce noise. Do not exceed the absolute maximum supply voltage of ±18V.
The AD620ARZ dissipates minimal power due to its low supply current (1.3 mA). At maximum supply voltage (±18V), power dissipation is approximately 47 mW, which is well within the SOIC package's thermal limits. No external heatsinking is required. Ensure adequate copper area for heat dissipation in high-temperature environments.
Compliance Information
RoHS compliant per distributor data. Other compliance information not specified in provided data.