AD8538ARZ - Precision Auto-Zero Op Amp | Analog Devices
MPN: AD8538ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.84 | $0.84 |
| 10 | $0.75 | $7.50 |
| 100 | $0.65 | $65.00 |
| 500 | $0.58 | $290.00 |
| 1,000 | $0.52 | $520.00 |
Drop-in alternatives for AD8538ARZ — 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:
AD8539ARZ
✅ Drop-In✓ In Stock
$0.82 / Unit
View Datasheet →AD8538ARZ-REEL7
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MCP6V11-E/SN
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AD8538ARZ Maximum Ratings & Electrical Characteristics
| Amplifier Type | Auto-Zero (Chopper-Stabilized) |
| Number of Circuits | 1 |
| Supply Voltage - Single | 2.7 V to 5.5 V |
| Supply Voltage - Dual | ±1.35 V to ±2.75 V |
| Input Offset Voltage (Max) | 13 µV |
| Input Offset Drift | 0.03 µV/°C |
| Input Bias Current | 25 pA |
| Supply Current (Max) | 215 µA at 5.0 V |
| Gain Bandwidth Product | [DATA_NEEDED: Gain Bandwidth Product] |
| Slew Rate | 400 mV/µs |
| CMRR | [DATA_NEEDED: CMRR] |
| PSRR | [DATA_NEEDED: PSRR] |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-SOIC (SOIC-8) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
AD8538ARZ Pin Configuration
| Pin 1 | OUT — Output |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | NC — No connect |
| Pin 6 | NC — No connect |
| Pin 7 | NC — No connect |
| 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
AD8538ARZ is suitable for 6 applications: Precision Current Sensing, Thermocouple and RTD Signal Conditioning, Medical Instrumentation, Portable Battery-Powered Devices, Industrial Process Control, Test and Measurement Equipment.
Precision Current Sensing
The AD8538ARZ's ultra-low offset voltage of 13 µV and low offset drift of 0.03 µV/°C enable accurate current measurement across shunt resistors. In a typical high-side current sensing circuit, the op amp amplifies the small voltage drop across a shunt, and the auto-zero architecture minimizes offset-induced errors, ensuring precise current monitoring in battery management systems and motor control. The low supply current of 215 µA makes it suitable for always-on sensing in portable devices. For best performance, use a precision shunt resistor and place the op amp close to the sensing element to reduce noise pickup.
Recommended
Thermocouple and RTD Signal Conditioning
The AD8538ARZ is ideal for thermocouple and RTD signal conditioning due to its low offset voltage (13 µV max) and low offset drift (0.03 µV/°C). In a thermocouple interface, the op amp amplifies the small Seebeck voltage, and the auto-zero architecture ensures that offset errors do not corrupt the measurement. The low input bias current of 25 pA minimizes loading on high-impedance sensors. The device operates from 2.7 V to 5.5 V, allowing direct battery operation. For cold-junction compensation, pair with a precision temperature sensor and use a low-pass filter to reduce noise.
Recommended
Medical Instrumentation
The AD8538ARZ is well-suited for medical instrumentation such as ECG and blood glucose monitors, where precision and low power are critical. Its ultra-low offset voltage of 13 µV ensures accurate signal amplification, while the low supply current of 215 µA extends battery life in portable devices. The auto-zero architecture provides excellent long-term stability, reducing the need for calibration. The small SOIC-8 package allows compact PCB designs. For safety, ensure proper isolation and use medical-grade power supplies.
Recommended
Portable Battery-Powered Devices
The AD8538ARZ is ideal for portable battery-powered devices due to its low supply current of less than 215 µA at 5.0 V. It operates from a single supply as low as 2.7 V, making it compatible with Li-ion batteries. The low offset voltage and drift ensure accurate signal processing in applications like portable instrumentation and wearable sensors. The SOIC-8 package is compact, and the device's wide temperature range (-40°C to +125°C) supports outdoor use. To maximize battery life, use power-saving modes and minimize the op amp's quiescent current.
Recommended
Industrial Process Control
The AD8538ARZ is suitable for industrial process control applications such as pressure and temperature transmitters, where precision and reliability are essential. Its low offset voltage (13 µV) and low drift (0.03 µV/°C) ensure accurate signal conditioning over a wide temperature range. The device operates from 2.7 V to 5.5 V, allowing use in 3.3 V or 5 V systems. The auto-zero architecture provides long-term stability, reducing maintenance. For harsh environments, consider conformal coating and proper ESD protection.
Recommended
Test and Measurement Equipment
The AD8538ARZ is used in test and measurement equipment such as data acquisition systems and precision voltmeters, where accuracy is paramount. Its ultra-low offset voltage of 13 µV and low input bias current of 25 pA minimize measurement errors. The device's high gain and CMRR ensure accurate amplification of small signals in noisy environments. The low supply current is beneficial for portable instruments. For best performance, use precision resistors and proper shielding to reduce noise.
Recommended
Recommended Products Summary
Engineering reference data for AD8538ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8539ARZ | MCP6V11-E/SN | OPA2188AIDR |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Microchip Technology | Texas Instruments |
| Number of Channels | 1 | 2 | 1 | 2 |
| Input Offset Voltage (Max) | 13 µV | 13 µV | 2 µV | 25 µV |
| Input Bias Current | 25 pA | 25 pA | 1 pA | 150 pA |
| Supply Current (Max) | 215 µA | 215 µA per amp | 300 µA | 475 µA per amp |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.2 V to 5.5 V | 4.5 V to 36 V |
| Slew Rate | 400 mV/µs | 400 mV/µs | 500 mV/µs | 800 mV/µs |
Key Differentiators
- Ultra-low offset voltage of 13 µV max (vs OPA2188AIDR)
- Low supply current of 215 µA max (vs MCP6V11-E/SN)
- Single-channel simplicity (vs AD8539ARZ)
Design Notes
The AD8538ARZ operates from a single supply of 2.7 V to 5.5 V or dual supplies of ±1.35 V to ±2.75 V. Ensure the supply voltage is within the specified range to avoid damage. Use a 0.1 µF ceramic capacitor close to the V+ and V- pins for decoupling, as recommended in the datasheet.
For optimal performance, place the AD8538ARZ close to the signal source to minimize trace inductance and noise pickup. Use a ground plane and keep analog traces short. Decouple the power supply pins with 0.1 µF ceramic capacitors placed as close as possible to the device, as per the datasheet layout guidelines.
Avoid exceeding the absolute maximum supply voltage of 5.5 V. The input common-mode range extends to the negative rail, but for best performance, keep inputs within the specified common-mode voltage range. Do not leave unused pins floating; connect NC pins to ground or leave unconnected as per datasheet.
Compliance Information
RoHS compliant per Analog Devices product page. AEC-Q100 not applicable for this commercial-grade part.
