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Texas Instruments OPA627AU/2K5G4
- Part No.:
- OPA627AU/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA627AU/2K5G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,715
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Product details
Overview
OPA627AU/2K5G4 from Texas Instruments is a precision JFET-input operational amplifier optimized for high-speed, low-noise signal conditioning in demanding analog systems. 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 accurate amplification of fast transients in DAC output stages and ultrasound front-ends.
For engineers reviewing the OPA627AU/2K5G4 datasheet, OPA627AU/2K5G4 pinout, OPA627AU/2K5G4 application, or OPA627AU/2K5G4 equivalent, key selection criteria include its ±125μV max input offset voltage (25°C), ±0.3μV/°C max drift over –25°C to +85°C, 5pA max input bias current, and SOIC-8 package compatibility with high-impedance sensor interfaces and active filter topologies requiring DC precision and wide bandwidth.
Technical Context
The OPA627AU/2K5G4 uses dielectrically isolated complementary NPN/PNP process technology with laser-trimmed input circuitry to achieve bipolar-level accuracy without sacrificing FET input impedance. Its cascode input stage maintains sub-5pA bias current across ±11.5V common-mode range while supporting ±15V dual-supply operation.
This device implements a fully compensated internal compensation network for unconditional unity-gain stability, distinguishing it from the higher-bandwidth OPA637 (gain ≥5 stable). Its open-loop gain exceeds 120dB and CMRR reaches 110dB, enabling high-precision closed-loop configurations in instrumentation-grade circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 4.5nV/√Hz at 10kHz - enables low-noise amplification of weak signals from piezoelectric sensors or photodiode transimpedance stages |
| Slew Rate | 150V/μs - supports faithful reproduction of fast 10V-step signals with ≤120ns settling to 0.01% in unity-gain buffer configurations |
| Gain-Bandwidth Product | 45MHz - allows stable closed-loop gains up to 10 with usable bandwidth >4MHz for active filter design |
| Input Offset Voltage | ±280μV max (25°C) - ensures <1mV error in 12-bit DAC output amplifiers operating at ±10V full scale |
| Input Bias Current | ±2pA max (25°C) - preserves signal integrity in >1GΩ source impedance applications like pH electrode buffers |
| Common-Mode Range | ±11.5V - accommodates rail-to-rail input operation with ±15V supplies, simplifying level-shifting in multi-stage analog chains |
| Supply Voltage Range | ±4.5V to ±18V - supports flexible power architecture in industrial data acquisition systems with varying supply rails |
Pinout & Package
OPA627AU/2K5G4 is packaged in an 8-pin SOIC (D package) with standard pinout compatible with industry-wide PCB footprints for precision op amps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | NC | No internal connection - must be left floating; not used for offset trim (TO-99 only) |
| 2 | –IN | Inverting input - connects to feedback network in inverting amplifiers or integrators |
| 3 | +IN | Noninverting input - accepts high-impedance sensor or reference signals with minimal loading |
| 4 | V– | Negative supply - referenced to system ground or negative rail; requires local 0.1μF bypass capacitor |
| 6 | OUT | Amplified output - drives 1kΩ loads to ±11.5V; capable of ±30mA continuous output current |
| 7 | V+ | Positive supply - referenced to system ground or positive rail; requires local 0.1μF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Internally compensated for stable operation at gain = 1 - eliminates need for external compensation in buffer or gain-of-one configurations |
| Laser-trimmed input stage | ±280μV max VOS and ±2.5μV/°C max drift - reduces calibration overhead in production test for medical and test equipment |
| Ultra-low input bias current | ≤2pA at 25°C, maintained over ±11.5V common-mode range - prevents signal degradation in high-Z electrophysiology and spectroscopy front-ends |
| Low 1/f noise | 0.34μVPP (0.1Hz–10Hz) - critical for precision DC-coupled measurements where low-frequency drift dominates error budget |
| High PSRR & CMRR | 116dB PSRR and 110dB CMRR - rejects power supply ripple and common-mode interference in noisy industrial environments |
Applications
| Precision Instrumentation | Fast Data Acquisition |
|---|---|
Use Scenario: High-resolution digital multimeter (DMM) input stage measuring microvolt-level thermocouple outputs with 24-bit ADC. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier providing gain, offset correction, and drive capability for sigma-delta ADC reference path. Use Value: ±280μV max offset and ±2.5μV/°C drift ensure <0.005% measurement accuracy over 0–50°C ambient without recalibration. |
Use Scenario: 1MSps data logger capturing transient waveforms from vibration sensors in predictive maintenance systems. IC Role / Device Role / Timing Role: Unity-gain buffer isolating sensor output and driving ADC sample-and-hold input with minimal settling delay. Use Value: 120ns settling to 0.01% and 150V/μs slew rate preserve waveform fidelity for 100kHz signal content within 1LSB of 16-bit resolution. |
| DAC Output Amplifier | High-Impedance Sensor Amp |
Use Scenario: Industrial PLC analog output module converting 16-bit DAC codes to ±10V control signals for valve actuators. IC Role / Device Role / Timing Role: Low-drift, low-noise output amplifier with rail-compatible swing and short-circuit protection. Use Value: ±11.5V output swing into 1kΩ load and 7.5mA quiescent current enable precise, low-power current loop interface compliance. |
Use Scenario: pH meter front-end amplifying nanoamp-level currents from glass electrode with >10GΩ source impedance. IC Role / Device Role / Timing Role: Transimpedance amplifier with guarded input and ultra-low IB to minimize input error voltage. Use Value: 2pA max input bias current limits offset error to <20mV across full pH range, eliminating manual zeroing during field use. |
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 |
|---|---|---|---|
| OPA627BM | Lower VOS (±100μV max), lower drift (±0.8μV/°C), same SOIC-8 package and pinout | Better DC accuracy for metrology-grade instruments; identical AC performance and stability behavior | Select OPA627BM when <±100μV offset and <1μV/°C drift are required over temperature without changing layout |
| OPA140AIDBVR | Lower noise (1.8nV/√Hz), lower IQ (1.5mA), but 20MHz GBW and 20V/μs slew rate - not unity-gain stable | Superior low-frequency noise for audio and sensor front-ends; requires minimum gain ≥5, limiting buffer use | Choose OPA140AIDBVR for ultra-low-noise, low-power applications where gain ≥5 is acceptable and bandwidth <20MHz suffices |
Compared with OPA627AU/2K5G4, OPA627BM offers tighter DC specifications without layout change, while OPA140AIDBVR trades bandwidth and stability for lower noise and power - making OPA627AU/2K5G4 optimal for unity-gain, high-slew-rate precision buffering where moderate noise is acceptable.
Availability
OPA627AU/2K5G4 is available at Aetrix Electronics and suitable for precision instrumentation, fast data acquisition, and DAC output amplification requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for OPA627AU/2K5G4 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The OPA627AU/2K5G4 belongs to TI's precision JFET op amp family engineered for high-speed, low-noise signal conditioning in test & measurement, medical imaging, and scientific instrumentation where DC accuracy and dynamic performance coexist.
FAQ
What is the maximum operating temperature range for the OPA627AU/2K5G4?
The OPA627AU/2K5G4 is specified for operation from –40°C to +125°C ambient temperature. Its electrical characteristics - including input offset voltage, bias current, and open-loop gain - are guaranteed over the industrial temperature range of –25°C to +85°C per the datasheet's Recommended Operating Conditions table. The device uses a SOIC-8 package with thermal resistance RθJA = 121.5°C/W, requiring appropriate board-level thermal management for sustained high-temperature operation. OPA627AU/2K5G4 maintains stability and performance across this full range without derating.
Is the OPA627AU/2K5G4 unity-gain stable, and what does that mean for circuit design?
Yes, the OPA627AU/2K5G4 is internally compensated for unity-gain stability, meaning it remains stable with closed-loop gain = 1 (e.g., voltage follower configuration) without requiring external compensation components. This eliminates phase-margin risks in buffer applications and simplifies layout for high-impedance sensor interfaces. Unlike the OPA637 (which requires gain ≥5), the OPA627AU/2K5G4 can safely drive capacitive loads up to 30pF in unity gain, making it ideal for DAC output buffering and active filter input stages. OPA627AU/2K5G4's stability is verified across its full supply and temperature range.
How does the input bias current of the OPA627AU/2K5G4 compare to bipolar op amps, and why does it matter?
The OPA627AU/2K5G4 specifies a maximum input bias current of ±2pA at 25°C - over six orders of magnitude lower than typical bipolar op amps (e.g., ~100nA for LM741). This ultra-low IB prevents voltage errors across high-impedance sources such as pH electrodes (>1GΩ), photodiode transimpedance nodes, or precision voltage dividers. At ±10V common-mode, IB remains below ±5pA, ensuring predictable, temperature-stable operation. OPA627AU/2K5G4 achieves this using JFET input cascoding without degrading voltage noise - a key differentiator versus older FET op amps.
Can the OPA627AU/2K5G4 drive heavy capacitive loads, and what layout guidance applies?
The OPA627AU/2K5G4 is characterized for stable operation with up to 30pF capacitive load in unity-gain configuration. Driving larger loads (e.g., >100pF) requires isolation via a series resistor (typically 20–100Ω) placed close to the output pin to maintain phase margin. Layout best practices include minimizing trace length between output and load, using ground plane under the device, placing 0.1μF ceramic bypass capacitors directly at pins 4 (V–) and 7 (V+), and guarding the inverting input node when used in high-gain transimpedance configurations. OPA627AU/2K5G4's SOIC-8 footprint supports these techniques without redesign.
What are the key differences between OPA627AU/2K5G4 and OPA627BU?
The OPA627AU/2K5G4 and OPA627BU share identical SOIC-8 packaging and pinout but differ in DC precision: OPA627AU/2K5G4 has ±280μV max input offset voltage and ±2.5μV/°C max drift, while OPA627BU achieves ±125μV max VOS and ±0.3μV/°C max drift. Both offer identical AC performance - 45MHz GBW, 150V/μs slew rate, and 4.5nV/√Hz noise. OPA627AU/2K5G4 targets cost-sensitive industrial applications where ±280μV offset is sufficient; OPA627BU suits metrology-grade systems requiring tighter initial calibration. OPA627AU/2K5G4 is also rated for HBM ESD of ±2000V vs ±2500V for OPA627BU.
OPA627AU/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Difet®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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/2K5G4 FAQ
1.How can I place an order for OPA627AU/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA627AU/2K5G4 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/2K5G4 reliable?
The price and inventory of OPA627AU/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA627AU/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA627AU/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA627AU/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA627AU/2K5G4?
OPA627AU/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA627AU/2K5G4 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/2K5G4?
For technical support, including OPA627AU/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA627AU/2K5G4 requirements.
6.How does Aetrix verify that OPA627AU/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA627AU/2K5G4 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/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA627AU/2K5G4?
All OPA627AU/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA627AU/2K5G4, 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/2K5G4 part is unused and in its original packaging.
Return procedure for OPA627AU/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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