AD8628ARTZ-REEL7 - Zero-Drift Op Amp | Analog Devices
MPN: AD8628ARTZ-REEL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
Drop-in alternatives for AD8628ARTZ-REEL7 — 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:
AD8605ARTZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD8628ARTZ-REEL7 Maximum Ratings & Electrical Characteristics
| Amplifier Type | Zero-Drift |
| Number of Circuits | 1 |
| Output Type | Rail-to-Rail |
| Slew Rate | 1 V/µs |
| Gain Bandwidth Product | 2.5 MHz |
| Current - Input Bias | 30 pA (typical) |
| Voltage - Input Offset | 1 µV (typical) |
| Current - Supply | 1 mA (typical) |
| Current - Output / Channel | 30 mA |
| Voltage - Supply Span (Min) | 2.7 V |
| Voltage - Supply Span (Max) | 5.5 V |
| Operating Temperature | -40°C to +125°C |
| Package / Case | SOT-23-5 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
AD8628ARTZ-REEL7 Pin Configuration
| Pin 1 | OUT — Amplifier output |
| Pin 2 | V- — Negative supply (ground in single-supply operation) |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | -IN — Inverting input |
| Pin 5 | 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
AD8628ARTZ-REEL7 is suitable for 6 applications: Precision Sensor Signal Conditioning, Medical Instrumentation, Battery-Powered Instrumentation, Thermocouple and RTD Amplifiers, Photodiode Amplifiers, Data Acquisition Systems.
Precision Sensor Signal Conditioning
The AD8628ARTZ-REEL7's ultralow offset voltage (1 µV) and drift (0.02 µV/°C) make it ideal for amplifying small sensor signals without introducing significant error. Its low bias current (30 pA) minimizes loading on high-impedance sensors like thermocouples and RTDs. The rail-to-rail output allows full-scale utilization of the ADC input range in battery-powered systems. For example, in a thermocouple interface, the amplifier provides high gain with minimal offset drift over temperature, ensuring accurate temperature readings. The auto-zero architecture eliminates the need for external trimming, simplifying the design. With a supply range of 2.7 V to 5.5 V, it can be powered directly from a 3.3 V or 5 V rail, making it suitable for portable instrumentation.
Recommended
Medical Instrumentation
In medical devices such as glucose monitors and pulse oximeters, the AD8628ARTZ-REEL7 provides the precision and low power required for accurate, battery-operated measurements. Its ultralow offset and drift ensure stable readings over time and temperature, critical for patient monitoring. The small SOT-23-5 package fits compact wearable designs. The amplifier's low supply current (1 mA) extends battery life, while the rail-to-rail output maximizes dynamic range for ADC interfacing. For example, in a glucose monitor, the op amp conditions the current from an electrochemical sensor, converting it to a voltage with minimal error. The auto-zero feature eliminates offset drift, which is essential for long-term monitoring. The wide operating temperature range (-40°C to +125°C) ensures reliability in clinical environments.
Recommended
Battery-Powered Instrumentation
The AD8628ARTZ-REEL7 is well-suited for battery-powered instruments due to its low supply current (1 mA) and wide supply voltage range (2.7 V to 5.5 V). It can operate directly from a single lithium-ion cell or two alkaline batteries. The rail-to-rail output allows maximum signal swing, improving ADC resolution. In portable data loggers, the amplifier conditions sensor signals with high accuracy while consuming minimal power. The auto-zero architecture ensures stable performance as the battery voltage declines. For example, in a handheld multimeter, the op amp provides precise amplification of voltage and current measurements. The small package and low power make it ideal for space-constrained, energy-efficient designs. Additionally, the low offset voltage reduces the need for calibration, simplifying manufacturing.
Recommended
Thermocouple and RTD Amplifiers
The AD8628ARTZ-REEL7 is ideal for thermocouple and RTD signal conditioning due to its ultralow offset voltage (1 µV) and drift (0.02 µV/°C). These sensors produce small voltages that require high-gain amplification without introducing significant error. The low bias current (30 pA) minimizes self-heating and loading effects. In a thermocouple circuit, the amplifier can provide gains of 100 or more while maintaining accuracy over a wide temperature range. The auto-zero feature eliminates offset drift, which is critical for precise temperature measurement. The rail-to-rail output allows direct interfacing with ADCs. For RTD applications, the amplifier can be configured as a bridge amplifier, providing accurate resistance-to-voltage conversion. The wide supply range and low power make it suitable for industrial and portable temperature measurement systems.
Recommended
Photodiode Amplifiers
The AD8628ARTZ-REEL7's low input bias current (30 pA) makes it suitable for photodiode amplifier circuits, where leakage current can cause significant errors. The amplifier can be configured as a transimpedance amplifier to convert photodiode current to voltage. Its low offset voltage ensures accurate dark current compensation. The 2.5 MHz bandwidth is sufficient for many optical sensing applications, such as light meters and fiber optic receivers. The rail-to-rail output allows maximum dynamic range for the ADC. In a pulse oximeter, the amplifier conditions the signal from a photodetector, providing accurate oxygen saturation readings. The auto-zero architecture reduces drift, ensuring stable performance over time. The small package and low power make it ideal for portable optical sensors.
Recommended
Data Acquisition Systems
In data acquisition systems, the AD8628ARTZ-REEL7 provides precision signal conditioning for analog sensors before ADC conversion. Its ultralow offset and drift ensure accurate measurements over time and temperature. The rail-to-rail output allows full-scale use of the ADC input range, maximizing resolution. The low power consumption is beneficial for multi-channel systems. For example, in a multi-channel data logger, each channel can use an AD8628 to buffer and amplify sensor signals. The auto-zero feature eliminates the need for offset calibration, simplifying system design. The small SOT-23-5 package allows high-density PCB layouts. The wide supply range (2.7 V to 5.5 V) is compatible with common ADC supply voltages. Overall, the AD8628 enhances the accuracy and reliability of data acquisition systems.
Recommended
Recommended Products Summary
Engineering reference data for AD8628ARTZ-REEL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8628ARZ-REEL7 | AD8605ARTZ-REEL7 | AD8629ARZ |
|---|---|---|---|---|
| Package | SOT-23-5 | SOIC-8 | SOT-23-5 | SOIC-8 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 1 | 1 | 1 | 2 |
| Offset Voltage (typ) | 1 µV | 1 µV | 65 µV | 1 µV |
| Offset Drift (typ) | 0.02 µV/°C | 0.02 µV/°C | 0.5 µV/°C | 0.02 µV/°C |
| Input Bias Current (typ) | 30 pA | 30 pA | 1 pA | 30 pA |
| Gain Bandwidth Product | 2.5 MHz | 2.5 MHz | 10 MHz | 2.5 MHz |
| Supply Current (typ) | 1 mA | 1 mA | 1.7 mA | 2 mA |
Key Differentiators
- Ultralow offset voltage of 1 µV (vs AD8605ARTZ-REEL7)
- Zero-drift architecture (vs AD8605ARTZ-REEL7)
- Lower supply current (vs AD8605ARTZ-REEL7)
Design Notes
The AD8628ARTZ-REEL7 operates from 2.7 V to 5.5 V single supply. Use a 0.1 µF ceramic capacitor close to the V+ pin and a 10 µF tantalum capacitor for bulk decoupling. For dual-supply operation, ensure both supplies are within ±1.35 V to ±2.75 V. The low supply current (1 mA) makes it suitable for battery-powered designs, but consider the output current capability (30 mA) when driving loads.
For optimal performance, place the AD8628ARTZ-REEL7 close to the signal source to minimize trace length and noise pickup. Use a ground plane to reduce EMI. Keep feedback resistors and capacitors close to the inverting input to minimize parasitic capacitance. The SOT-23-5 package has a thermal pad; connect it to the ground plane for better heat dissipation, though power dissipation is typically low.
Avoid exceeding the absolute maximum supply voltage of 6 V. The input common-mode range includes both rails, but do not apply voltages beyond the supply rails. The output can swing to within 10 mV of the rails, but ensure the load does not draw more than 30 mA. For high-impedance sources, the low bias current (30 pA) is beneficial, but use guarding if leakage currents are a concern.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
