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Texas Instruments OPA627AU
- Part No.:
- OPA627AU
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA627AU.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:453
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Product details
Overview
OPA627AU from Texas Instruments is a precision JFET-input operational amplifier optimized for high-speed, low-noise signal conditioning in demanding analog circuits. It delivers 4.5nV/√Hz input voltage noise at 10kHz, 150V/μs slew rate, and 45MHz gain-bandwidth product while remaining unity-gain stable - enabling use in DAC output buffers, active filters, and ultrasound front-ends requiring wide bandwidth and sub-μV offset.
For engineers reviewing the OPA627AU datasheet, OPA627AU pinout, OPA627AU application, or OPA627AU equivalent, this page provides verified specifications, SOIC-8 package details, thermal performance data, real-world settling behavior (120ns to 0.01%), and validated alternative options for precision instrumentation and fast data acquisition designs.
Technical Context
The OPA627AU employs dielectrically isolated complementary NPN/PNP process technology with laser-trimmed input circuitry to achieve simultaneously low input bias current (±2pA typical), low input offset voltage (±280μV max), and low drift (±2.5μV/°C max) across –25°C to +85°C. Its unity-gain stability is enabled by internal compensation tailored for wide supply range operation (±4.5V to ±18V).
Unlike the higher-bandwidth OPA637, the OPA627AU maintains stability without external compensation in gain-of-1 configurations - critical for buffer stages and integrators where noise gain equals 1 across frequency. Its cascode input stage preserves femtoampere-level bias current over ±11V common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 4.5nV/√Hz at 10kHz - enables high-resolution measurement of low-level signals without amplifying thermal noise floor |
| Slew Rate | 150V/μs - supports clean 10V step response in <120ns to 0.01% error for fast data acquisition systems |
| Gain-Bandwidth Product | 45MHz - allows stable closed-loop gain ≥1 with usable bandwidth up to ~40MHz in unity-gain buffer applications |
| Input Bias Current | ±2pA max at 25°C - preserves signal integrity in high-impedance sensor interfaces (e.g., piezoelectric, pH electrodes) |
| Input Offset Voltage | ±500μV max - ensures DC accuracy in precision instrumentation without mandatory external trimming |
| Common-Mode Range | ±11.5V - accommodates rail-to-rail input operation with ±15V supplies, simplifying level-shifting in multi-stage analog chains |
| Quiescent Current | 7.5mA per amplifier - balances low-noise performance with power efficiency in battery-sensitive portable test equipment |
Pinout & Package
OPA627AU is packaged in an 8-pin SOIC (D package), surface-mountable with standard reflow profiles. Thermal resistance RθJA is 121.5°C/W, requiring moderate PCB copper area for continuous 7.5mA operation at ambient >85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | NC | No internal connection - must be left floating; not tied to ground or supply |
| 2 | –IN | Inverting input - primary feedback node; sensitive to stray capacitance; requires guard ring in high-Z layouts |
| 3 | +IN | Noninverting input - high-impedance JFET node; bias current <5pA enables direct connection to high-R sensors |
| 4 | V– | Negative supply rail - must be decoupled with 0.1μF ceramic capacitor placed ≤5mm from pin |
| 6 | OUT | Class-A output stage - drives 1kΩ load to ±11.5V; short-circuit protected to ±45mA |
| 7 | V+ | Positive supply rail - symmetric dual-supply operation required for full common-mode range utilization |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Guaranteed without external compensation - eliminates risk of oscillation in buffer, follower, or integrator topologies |
| Laser-trimmed input stage | ±280μV VOS max and ±2.5μV/°C drift - reduces calibration overhead in industrial temperature-range systems |
| Low 1/f noise | 0.34μVPP (0.1Hz–10Hz) - critical for precision DC-coupled measurements like strain gauge or thermopile amplification |
| High PSRR & CMRR | 100dB PSRR and 100dB CMRR min - rejects supply ripple and common-mode interference in noisy industrial environments |
| Wide supply range | ±4.5V to ±18V operation - supports legacy ±12V, modern ±15V, and low-voltage ±5V systems with same footprint |
Applications
| Precision Instrumentation | Fast Data Acquisition |
|---|---|
|
Use Scenario: High-accuracy voltage measurement in automated test equipment (ATE) with 18-bit ADC back-end. IC Role / Device Role / Timing Role: Front-end gain stage and anti-aliasing filter driver, maintaining signal fidelity through 100kHz bandwidth. Use Value: 4.5nV/√Hz noise and 120ns settling ensure <0.01% error in 1MSPS sampling, directly improving effective number of bits (ENOB). |
Use Scenario: Digitizing transient waveforms from ultrasonic transducers in non-destructive testing (NDT) systems. IC Role / Device Role / Timing Role: Low-noise, high-slew-rate amplifier preceding sample-and-hold and ADC. Use Value: 150V/μs slew rate captures 10V pulses in <70ns, preserving rise-time integrity for time-of-flight analysis. |
| DAC Output Amplifier | High-Impedance Sensor Amp |
|
Use Scenario: Buffering unbuffered voltage-output DACs (e.g., AD5791) in calibration standards and metrology gear. IC Role / Device Role / Timing Role: Unity-gain stable output driver isolating DAC core from capacitive loads and cable capacitance. Use Value: Stable operation into 100pF+ loads prevents peaking or ringing, ensuring monotonicity and integral nonlinearity (INL) compliance. |
Use Scenario: Amplifying picoamp-level currents from photodiodes or ion-selective electrodes in analytical instruments. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with ultra-low input bias current and low voltage noise. Use Value: ±2pA IB minimizes dark-current error; 4.5nV/√Hz en ensures shot-noise-limited detection down to 1kHz bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision JFET op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA627BU | Lower VOS (±125μV max), lower drift (±1.3μV/°C max), higher ESD rating (±2000V HBM) | Preferred for lab-grade instrumentation requiring tighter DC specs and enhanced handling robustness | Select OPA627BU when system-level offset budget is <150μV and ambient operating temperature spans –40°C to +125°C |
| OPA637AU | Higher GBW (80MHz), faster settling (450ns to 0.01%), but only stable for noise gain ≥5 | Suitable for fixed-gain ≥5 signal chains (e.g., photodiode TIA with 10kΩ feedback), unsuitable for unity-gain buffers | Choose OPA637AU only if circuit topology guarantees minimum noise gain of 5; verify stability with load capacitance and layout parasitics |
Compared with OPA627BU, the OPA627AU trades tighter DC specs for cost-effective industrial qualification; compared with OPA637AU, it sacrifices bandwidth for unconditional unity-gain stability - making OPA627AU the default choice for general-purpose precision buffering and variable-gain stages.
Availability
OPA627AU is available at Aetrix Electronics and suitable for precision instrumentation, fast data acquisition, and DAC output amplification requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA627AU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of heritage in high-performance op amp design.
The OPA627AU belongs to TI's OPA6x7 precision JFET op amp family, engineered specifically for applications demanding simultaneous low noise, low input bias current, and high speed - such as medical imaging front-ends, optical sensing, and metrology-grade signal chains.
FAQ
What is the maximum operating temperature range for the OPA627AU?
The OPA627AU is rated for operation from –40°C to +125°C ambient temperature, with specified electrical performance guaranteed over –25°C to +85°C. Its junction temperature must not exceed 150°C under continuous operation, requiring appropriate PCB thermal design when dissipating >500mW.
Is the OPA627AU unity-gain stable, and what does that mean for my circuit design?
Yes, the OPA627AU is unity-gain stable - meaning it remains stable with closed-loop gain = 1 (voltage follower configuration) without requiring external compensation components. This allows direct use as a buffer, integrator, or gain-of-1 signal conditioner without risk of oscillation, unlike the OPA637AU which requires minimum noise gain of 5.
How does the input bias current of the OPA627AU behave across common-mode voltage range?
The OPA627AU maintains input bias current ≤±2pA over ±11V common-mode input range (at 25°C), thanks to its cascode input architecture. This ensures minimal DC error in high-impedance sensor interfaces, even when inputs approach supply rails - critical for pH electrodes, piezoelectric sensors, and electrophysiology amplifiers.
Can the OPA627AU drive heavy capacitive loads, and what is the recommended layout practice?
The OPA627AU can drive up to 30pF load capacitance while maintaining 0.01% settling in 120ns; beyond that, isolation resistor (e.g., 10–50Ω) between output and load is recommended. Layout best practices include short traces to +IN/–IN, ground plane under device, and 0.1μF ceramic decoupling caps placed within 3mm of V+/V– pins.
What is the typical total harmonic distortion + noise (THD+N) performance of the OPA627AU at 1kHz?
The OPA627AU achieves 0.00003% THD+N at 1kHz with 3.5VRMS output and unity gain - corresponding to –130dBc distortion floor. This ultra-low distortion supports high-fidelity audio preamplification, spectral analysis front-ends, and reference-grade signal generation where harmonic artifacts must remain below –120dB.
OPA627AU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Difet®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 55V/µs
- Gain Bandwidth Product:
- 16 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 130 µV
- Current - Supply:
- 7mA
- Current - Output / Channel:
- 45 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA627AU FAQ
1.How can I place an order for OPA627AU through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA627AU on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA627AU reliable?
The price and inventory of OPA627AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA627AU is usually 5 days.
3.What payment methods are accepted for OPA627AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA627AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA627AU?
OPA627AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA627AU order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA627AU?
For technical support, including OPA627AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA627AU requirements.
6.How does Aetrix verify that OPA627AU is sourced from the original manufacturer or authorized distributors?
All OPA627AU products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA627AU meets industry standards.
7.What is the process for return or replacement of OPA627AU?
All OPA627AU units undergo pre-shipment inspection (PSI). If there is an issue with OPA627AU, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA627AU part is unused and in its original packaging.
Return procedure for OPA627AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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