AD623ARZ-R7 - Single-Supply Rail-to-Rail In-Amp | Analog Devices
MPN: AD623ARZ-R7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.47 | $1,235.00 |
| 1,000 | $2.2 | $2,200.00 |
Drop-in alternatives for AD623ARZ-R7 — 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:
AD623BRZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
AD623ARZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD623ARZ-R7 Maximum Ratings & Electrical Characteristics
| Number of Channels | 1 |
| Supply Voltage Range (Single) | 3 V to 12 V |
| Supply Voltage Range (Dual) | ±2.5 V to ±6 V |
| Output Type | Rail-to-Rail |
| 3 dB Bandwidth | 800 kHz |
| CMRR (Minimum at G=1) | 90 dB |
| Gain Formula | G = 1 + 100 kΩ/RG |
| Gain Range | 1 to 1000 |
| Input Offset Voltage (B Grade) | 50 µV max |
| Input Offset Drift (B Grade) | 0.3 µV/°C |
| Operating Temperature Range | -40°C to +85°C |
| Package | 8-SOIC |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Number of Circuits | 1 |
AD623ARZ-R7 Pin Configuration
| Pin 1 | RG — Gain setting resistor terminal |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply (or ground in single-supply operation) |
| Pin 5 | REF — Reference voltage input for level shifting |
| Pin 6 | OUT — Amplifier output |
| Pin 7 | V+ — Positive supply |
| Pin 8 | RG — Gain setting resistor terminal |
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
AD623ARZ-R7 is suitable for 6 applications: Load Cell Signal Conditioning, Medical Instrumentation (ECG/EEG), Pressure Sensor Interface, Thermocouple Amplifier, Industrial Process Control, Battery-Powered Portable Devices.
Load Cell Signal Conditioning
The AD623ARZ-R7 is ideal for load cell applications due to its high CMRR (90 dB min) and low offset voltage (50 µV max for B grade). It operates from a single 5 V supply, making it compatible with typical load cell bridges. The rail-to-rail output allows full-scale utilization of the ADC input range. In a typical bridge configuration, the AD623 amplifies the small differential voltage from the bridge, rejecting common-mode noise. With a gain set by a single resistor, it can amplify signals from 1 mV/V to several volts, enabling precise weight measurement. The device's low drift ensures stable readings over temperature, which is critical for industrial scales and force sensors.
Recommended
Medical Instrumentation (ECG/EEG)
The AD623ARZ-R7 is well-suited for ECG and EEG applications due to its high CMRR and low noise. It amplifies the small biopotential signals (typically 1 mV for ECG) while rejecting 50/60 Hz common-mode interference. The single-supply operation from 3 V to 5 V is ideal for portable medical devices. The rail-to-rail output allows direct interface to ADCs without level shifting. The device's low offset voltage and drift ensure accurate signal acquisition over long monitoring periods. In ECG front-ends, the AD623 is often used as the first-stage amplifier, providing high input impedance and gain of 10 to 100. Its bandwidth of 800 kHz is more than sufficient for biopotential signals, which are typically below 1 kHz.
Recommended
Pressure Sensor Interface
The AD623ARZ-R7 is commonly used to condition the output of piezoresistive pressure sensors. These sensors produce small differential voltages that need amplification and common-mode rejection. The AD623's high CMRR (90 dB min) ensures accurate measurement in noisy industrial environments. With a single 5 V supply, it can interface directly with the sensor bridge and provide a rail-to-rail output to an ADC. The gain can be set to match the sensor's full-scale output, optimizing resolution. The device's low offset voltage and drift are essential for maintaining accuracy over temperature variations. In automotive and industrial applications, the AD623 provides a cost-effective solution for pressure monitoring systems.
Recommended
Thermocouple Amplifier
The AD623ARZ-R7 can be used to amplify the small voltage output of thermocouples (typically 10-50 µV/°C). Its low offset voltage (50 µV max for B grade) minimizes error, and its high CMRR rejects common-mode noise from the thermocouple leads. The device operates from a single supply, making it suitable for portable temperature measurement devices. The gain can be set to amplify the thermocouple signal to a level suitable for an ADC. Cold-junction compensation can be implemented externally. The AD623's bandwidth is sufficient for temperature sensing, which is a slow-varying signal. Its low drift ensures accurate temperature readings over a wide range.
Recommended
Industrial Process Control
In industrial process control, the AD623ARZ-R7 is used to condition signals from various sensors, such as temperature, pressure, and flow. Its wide supply range (3 V to 12 V) allows operation from standard industrial power rails. The high CMRR ensures accurate signal transmission over long cable runs, rejecting electromagnetic interference. The rail-to-rail output enables direct interface to ADCs and microcontrollers. The device's robustness and industrial temperature range (-40°C to +85°C) make it suitable for harsh environments. In 4-20 mA loop applications, the AD623 can be used to amplify the sensor signal before conversion to a current loop. Its low power consumption is beneficial for loop-powered devices.
Recommended
Battery-Powered Portable Devices
The AD623ARZ-R7 is ideal for battery-powered portable devices due to its low supply current (typically 375 µA) and single-supply operation from 3 V to 5 V. It is used in portable medical monitors, handheld meters, and wireless sensor nodes. The rail-to-rail output maximizes the dynamic range of the ADC, improving measurement accuracy. The device's small 8-SOIC package is space-efficient for compact designs. Its low offset voltage and drift ensure reliable performance over battery life. In portable applications, the AD623 can be powered directly from a 3.3 V or 5 V rail, simplifying power supply design. The shutdown feature (if available) can further reduce power consumption in standby mode.
Recommended
Recommended Products Summary
Engineering reference data for AD623ARZ-R7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD623BRZ-R7 | AD623ARZ | AD623ARMZ | AD623ANZ | INA333AIDGKR |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-MSOP | 8-DIP | 8-MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Supply Voltage Range | 3 V to 12 V | 3 V to 12 V | 3 V to 12 V | 3 V to 12 V | 3 V to 12 V | 1.8 V to 5.5 V |
| Bandwidth | 800 kHz | 800 kHz | 800 kHz | 800 kHz | 800 kHz | 150 kHz |
| CMRR (min at G=1) | 90 dB | 90 dB | 90 dB | 90 dB | 90 dB | 100 dB |
| Input Offset Voltage (max) | 50 µV (B grade) | 50 µV | 200 µV (A grade) | 200 µV (A grade) | 200 µV (A grade) | 25 µV |
| Quiescent Current | 375 µA (typical) | 375 µA | 375 µA | 375 µA | 375 µA | 50 µA |
| Gain Range | 1 to 1000 | 1 to 1000 | 1 to 1000 | 1 to 1000 | 1 to 1000 | 1 to 1000 |
Key Differentiators
- Single-supply operation with rail-to-rail output (vs INA333AIDGKR)
- Higher bandwidth (vs INA333AIDGKR)
- Industry-standard 8-lead pinout (vs AD623ARMZ)
Design Notes
Place the gain-setting resistor (RG) as close to the AD623 as possible to minimize parasitic capacitance and inductance, which can affect high-frequency performance and stability. Use a 0.1 µF bypass capacitor on each supply pin (V+ and V-) to ground, placed within 0.1 inches of the pins. For single-supply operation, connect V- to ground and ensure the reference pin is driven by a low-impedance source to maintain accuracy.
Do not exceed the absolute maximum supply voltage of 12 V (single supply) or ±6 V (dual supply). Ensure the input voltages stay within the common-mode input range, which is typically from V- to V+ - 1.2 V. The reference pin must not be left floating; connect it to a low-impedance source, such as a voltage divider or an op-amp buffer, to avoid output offset errors.
The AD623ARZ-R7 dissipates minimal power (typically less than 5 mW at 5 V supply), so thermal management is not a concern in most applications. However, in high-temperature environments, ensure the junction temperature stays below 150°C. The 8-SOIC package has a thermal resistance of approximately 150°C/W, so for high supply voltages and output currents, consider the power dissipation and ambient temperature.
Compliance Information
RoHS compliant per distributor listings. REACH compliance is assumed based on Analog Devices' general compliance, but not explicitly stated in the provided data.