AD8628ARZ - Zero-Drift Op Amp, Rail-to-Rail | Analog Devices
MPN: AD8628ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.35 | $2.35 |
| 10 | $2.11 | $21.10 |
| 100 | $1.89 | $189.00 |
| 500 | $1.68 | $840.00 |
| 1,000 | $1.49 | $1,490.00 |
Drop-in alternatives for AD8628ARZ — 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:
AD8629ARZ
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →AD8630ARZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD8628ARZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
OPA2188AIDR
✅ Drop-In📋 Reference alternative (not in catalog)
MCP6V11-E/SN
✅ Drop-In📋 Reference alternative (not in catalog)
AD8628ARZ 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 | 100 pA max |
| Voltage - Input Offset | 1 µV |
| Current - Supply | 1.7 mA |
| 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 | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
AD8628ARZ Pin Configuration
| Pin 1 | OUT A — Output of amplifier A |
| Pin 2 | -IN A — Inverting input of amplifier A |
| Pin 3 | +IN A — Non-inverting input of amplifier A |
| Pin 4 | V- — Negative supply or ground |
| Pin 5 | +IN B — Non-inverting input of amplifier B (not used in single version) |
| Pin 6 | -IN B — Inverting input of amplifier B (not used in single version) |
| Pin 7 | OUT B — Output of amplifier B (not used in single version) |
| 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
AD8628ARZ is suitable for 6 applications: Precision Instrumentation, Sensor Signal Conditioning, Medical Instrumentation, Battery-Powered Devices, ADC Driver Circuits, Industrial Process Control.
Precision Instrumentation
The AD8628ARZ's ultralow offset voltage (1 µV) and drift (0.002 µV/°C) make it ideal for precision instrumentation amplifiers, where accurate measurement of small signals is critical. Its rail-to-rail output maximizes dynamic range in low-voltage systems, and the high CMRR (130 dB) rejects common-mode noise. In a typical bridge sensor interface, the AD8628ARZ amplifies the differential signal while maintaining high accuracy over temperature, ensuring reliable readings in industrial and laboratory equipment.
Recommended
Sensor Signal Conditioning
For thermocouple, RTD, and strain gauge conditioning, the AD8628ARZ provides the low offset and drift needed to avoid calibration errors. Its low bias current (100 pA) minimizes loading on high-impedance sensors, and the 5 V single-supply operation simplifies power design. The auto-zero architecture ensures stable performance over time and temperature, making it suitable for industrial process control and environmental monitoring. The device's low noise (19.4 nV/√Hz) preserves signal integrity in low-level measurements.
Recommended
Medical Instrumentation
In medical devices like patient monitors and diagnostic equipment, the AD8628ARZ's precision and low power are essential. Its 1 µV offset and 0.002 µV/°C drift ensure accurate biopotential measurements, while the rail-to-rail output allows direct interface to ADCs. The low supply current (1.7 mA) extends battery life in portable devices. The device's small SOIC-8 package fits compact PCB layouts, and its reliability meets the demands of medical-grade electronics.
Recommended
Battery-Powered Devices
The AD8628ARZ is well-suited for battery-powered devices due to its low supply current (1.7 mA) and operation down to 2.7 V. Its rail-to-rail input/output maximizes signal range in single-supply systems, and the low offset voltage reduces errors in power monitoring circuits. In portable instruments, the device can amplify sensor signals without draining the battery, and its small package saves board space. The auto-zero feature maintains accuracy as the battery voltage declines.
Recommended
ADC Driver Circuits
The AD8628ARZ is used to drive high-resolution ADCs, as referenced in Analog Devices application note AN-1525. Its low output impedance and rail-to-rail output ensure the ADC input is fully driven, while the low noise and distortion preserve signal fidelity. The device's bandwidth (2.5 MHz) is sufficient for many data acquisition systems, and its precision ensures accurate conversion. In a typical circuit, the AD8628ARZ buffers the DAC output or amplifies a sensor signal before the ADC, maintaining signal integrity.
Recommended
Industrial Process Control
In industrial process control, the AD8628ARZ provides accurate signal conditioning for pressure, temperature, and flow sensors. Its high CMRR (130 dB) rejects noise from long cable runs, and the low offset drift ensures stable operation over wide temperature ranges. The device's 5 V single-supply operation simplifies interface with microcontrollers and ADCs. Its robustness and long-term stability make it suitable for 24/7 operation in factory automation and process monitoring systems.
Recommended
Recommended Products Summary
Engineering reference data for AD8628ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8629ARZ | AD8630ARZ | OPA2188AIDR | MCP6V11-E/SN |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Microchip Technology |
| Number of Channels | 1 | 2 | 4 | 2 | 1 |
| Input Offset Voltage | 1 µV | 1 µV | 1 µV | 25 µV | 2 µV |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 36 V | 2.2 V to 5.5 V |
| Bandwidth | 2.5 MHz | 2.5 MHz | 2.5 MHz | 2 MHz | 0.5 MHz |
| Slew Rate | 1 V/µs | 1 V/µs | 1 V/µs | 0.8 V/µs | 0.5 V/µs |
| Supply Current (per amp) | 1.7 mA | 1.7 mA | 1.7 mA | 0.475 mA | 0.75 mA |
Key Differentiators
- Ultralow offset voltage of 1 µV (vs OPA2188AIDR)
- Low input bias current of 100 pA (vs MCP6V11-E/SN)
- Rail-to-rail input and output (vs OPA2188AIDR)
Design Notes
The AD8628ARZ operates from a single supply of 2.7 V to 5.5 V. Ensure the supply is well-regulated and decoupled with a 0.1 µF ceramic capacitor placed close to the V+ pin (pin 8) and a 10 µF tantalum capacitor for lower frequencies. For dual-supply operation, use ±2.5 V supplies and decouple both rails. The device draws 1.7 mA typical supply current, so power dissipation is minimal, but consider thermal effects in high-temperature environments.
For optimal performance, place the AD8628ARZ close to the signal source to minimize trace inductance and noise pickup. Use a ground plane and keep analog traces short. Bypass capacitors should be placed as close as possible to the power pins. The SOIC-8 package has a thermal pad? No, it does not, so ensure adequate copper area for heat dissipation if operating at high ambient temperatures. Follow the layout guidelines in the datasheet for best results.
A common pitfall is neglecting the input common-mode range. The AD8628ARZ supports rail-to-rail input, but ensure the input voltage does not exceed the supply rails by more than 0.3 V to avoid damage. Also, the auto-zero clock can introduce high-frequency noise; use an output filter if the application is sensitive. Avoid using large feedback resistors (e.g., >100 kΩ) as they can interact with input capacitance and cause instability. Always refer to the datasheet for recommended component values.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified. Lead-free finish.