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)
OPA188AIDBVT
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
MCP6V11T-E/OT
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
AD8628ARTZ-REEL7 Maximum Ratings & Electrical Characteristics
| Number of Channels | 1 |
| Supply Voltage - Single | 2.7 V to 5.5 V |
| Supply Voltage - Dual | ±1.35 V to ±2.75 V |
| Offset Voltage | 1 µV (typical) |
| Offset Drift | 0.02 µV/°C |
| Bias Current | 30 pA (typical) |
| Gain Bandwidth Product | 2.5 MHz |
| Slew Rate | 1 V/µs |
| Rail-to-Rail Input | Yes |
| Rail-to-Rail Output | Yes |
| Operating Temperature Range | -40°C to +125°C |
| Package | SOT-23-5 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Amplifier Type | Zero-Drift |
AD8628ARTZ-REEL7 Pin Configuration
| Pin 1 | OUT — Output |
| Pin 2 | V- — Negative supply (ground in single-supply) |
| 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 Signal Conditioning, Precision Current Sensing, Active Filter and Buffer Circuits.
Precision Sensor Signal Conditioning
The AD8628ARTZ-REEL7's ultralow offset voltage (1 µV) and drift (0.02 µV/°C) ensure accurate amplification of small sensor signals without calibration. Its rail-to-rail input and output maximize dynamic range in single-supply systems. The auto-zero architecture eliminates offset errors over temperature, making it ideal for bridge sensors, thermocouples, and RTDs. With a bias current of 30 pA, it minimizes loading on high-impedance sensors. The 2.5 MHz bandwidth supports moderate-speed sensing applications. For best performance, use a 0.1 µF decoupling capacitor close to the supply pins.
Recommended
Medical Instrumentation
In medical devices like glucose monitors and pulse oximeters, the AD8628ARTZ-REEL7 provides the precision and low power required for battery-operated equipment. Its 1 µV offset and 30 pA bias current ensure accurate measurement of tiny physiological signals. The small SOT-23-5 package fits space-constrained designs. Operating from 2.7 V to 5.5 V, it is compatible with standard battery voltages. The extended temperature range (-40°C to +125°C) ensures reliability in clinical environments. Proper PCB layout with ground planes and decoupling is essential for noise performance.
Recommended
Battery-Powered Instrumentation
The AD8628ARTZ-REEL7's low supply current (typical 1 mA) and wide supply range (2.7 V to 5.5 V) make it ideal for portable instruments. Its rail-to-rail output allows full-scale output even at low supply voltages, maximizing battery life. The auto-zero feature maintains accuracy as the battery discharges. The small SOT-23-5 package minimizes board space. For extended battery life, consider powering down the amplifier when not in use, as the AD8628 has no shutdown pin. Use low-leakage capacitors for input filtering to preserve accuracy.
Recommended
Thermocouple and RTD Signal Conditioning
The AD8628ARTZ-REEL7 is well-suited for thermocouple and RTD conditioning due to its ultra-low offset and drift. A thermocouple produces only microvolt-level signals, and the 1 µV offset ensures minimal error. The 0.02 µV/°C drift prevents temperature-induced inaccuracies. The 30 pA bias current reduces self-heating errors in RTDs. The rail-to-rail input allows direct connection to the sensor without level shifting. For cold-junction compensation, pair with a temperature sensor and ADC. The 2.5 MHz bandwidth is sufficient for slow temperature changes.
Recommended
Precision Current Sensing
The AD8628ARTZ-REEL7 can amplify small voltages across shunt resistors for current sensing. Its low offset voltage (1 µV) allows accurate measurement of low currents. The rail-to-rail input and output enable sensing at both supply rails. The 2.5 MHz bandwidth supports fast current transients. The auto-zero feature eliminates offset drift over temperature, crucial for long-term monitoring. For high-side sensing, ensure the input common-mode range is respected. Use a precision shunt resistor with low temperature coefficient for best accuracy.
Recommended
Active Filter and Buffer Circuits
The AD8628ARTZ-REEL7 can be used in active filters and buffer circuits where DC accuracy is important. Its 2.5 MHz gain bandwidth allows implementation of low-pass filters up to a few hundred kHz. The rail-to-rail output provides maximum signal swing. The low offset and drift ensure accurate DC levels in filters. The auto-zero architecture reduces 1/f noise, beneficial for low-frequency filters. For higher-order filters, multiple stages can be cascaded. Ensure stability by using appropriate feedback capacitors and resistors.
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 | AD8629ARZ-REEL7 | AD8605ARTZ-REEL7 | ADA4522-1ARZ-RL7 | OPA188AIDBVT | MCP6V11T-E/OT |
|---|---|---|---|---|---|---|---|
| Package | SOT-23-5 | SOIC-8 | SOIC-8 | SOT-23-5 | SOIC-8 | SOT-23-5 | SOT-23-5 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Microchip Technology |
| Offset Voltage | 1 µV | 1 µV | 1 µV | 50 µV | 1.5 µV | 25 µV | 2 µV |
| Offset Drift | 0.02 µV/°C | 0.02 µV/°C | 0.02 µV/°C | 0.5 µV/°C | 0.015 µV/°C | 0.03 µV/°C | 0.05 µV/°C |
| Bias Current | 30 pA | 30 pA | 30 pA | 1 pA | 50 pA | 160 pA | 1 pA |
| Gain Bandwidth Product | 2.5 MHz | 2.5 MHz | 2.5 MHz | 10 MHz | 5.5 MHz | 2 MHz | 1 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V | 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 | 4 V to 36 V | 1.8 V to 5.5 V |
| Rail-to-Rail I/O | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Ultralow offset voltage of 1 µV (vs AD8605ARTZ-REEL7)
- Near-zero offset drift of 0.02 µV/°C (vs OPA188AIDBVT)
- Auto-zero topology with no external capacitor (vs MCP6V11T-E/OT)
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 bulk capacitor for low-frequency decoupling. For dual-supply operation, ensure both supplies are properly decoupled to ground. The amplifier's quiescent current is typically 1 mA, so power dissipation is minimal, but consider thermal effects in high-temperature environments.
For optimal performance, place the AD8628ARTZ-REEL7 on a PCB with a solid ground plane. Keep input traces short and shielded to minimize noise pickup. Use guard rings around the input pins to reduce leakage currents, especially in high-impedance sensor applications. The SOT-23-5 package has a thermal pad; connect it to the ground plane for better heat dissipation.
Avoid exceeding the absolute maximum supply voltage of 6 V. The auto-zero architecture eliminates the need for an external capacitor, but ensure the input common-mode voltage stays within the specified range. For AC-coupled applications, be aware of the amplifier's bandwidth and noise. Do not leave unused inputs floating; tie them to a suitable voltage.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
