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Texas Instruments OPA227U
- Part No.:
- OPA227U
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA227U.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,061
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Product details
Overview
OPA227U from Texas Instruments is a single-channel, high-precision, low-noise operational amplifier in an 8-pin SOIC package. It delivers 8 MHz unity-gain bandwidth, 2.3 V/µs slew rate, 3 nV/√Hz input voltage noise, 138 dB CMRR, and ±75 µV max input offset voltage - enabling high-fidelity signal conditioning in data acquisition and professional audio front-ends.
For engineers reviewing the OPA227U datasheet, OPA227U pinout, OPA227U application, or OPA227U equivalent, key selection criteria include its unity-gain stability, low 10 nA max input bias current, wide ±2.5 V to ±18 V dual-supply operation, and compatibility with precision DC + AC signal chains requiring sub-100 µV offset and <0.6 µV/°C drift.
Technical Context
The OPA227U implements a fully compensated, bipolar-input op amp architecture optimized for unity-gain stability without external compensation. Its internal offset trim pins (Pins 1 and 8) enable fine-tuning of input offset voltage to <5 µV in critical applications.
It operates across –40°C to +85°C with guaranteed performance at ±5 V to ±15 V supplies, supports rail-to-rail output swing within 2 V of rails (at 10 kΩ load), and maintains 160 dB open-loop gain and 120 dB CMRR over temperature - making it suitable for high-accuracy instrumentation amplifiers and sensor interface stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 8 MHz unity-gain bandwidth enables stable amplification of signals up to audio and low-speed data acquisition frequencies. |
| Slew Rate | 2.3 V/µs supports clean 10-V step response in ≤5 µs to 0.1%, critical for fast-settling ADC drivers. |
| Input Noise | 3 nV/√Hz (1 kHz) and 90 nVPP (0.1–10 Hz) ensure minimal added noise in low-level sensor signal paths. |
| Offset Voltage | ±75 µV maximum (U grade) allows direct interfacing with 16-bit+ SAR ADCs without trimming in many cases. |
| CMRR | 138 dB minimum rejects common-mode interference in noisy industrial or mixed-signal PCB environments. |
| Supply Range | ±2.5 V to ±18 V dual supply supports both low-voltage portable and high-dynamic-range industrial systems. |
| Quiescent Current | ±3.8 mA typical per amplifier balances precision performance with moderate power consumption. |
Pinout & Package
OPA227U is housed in an 8-pin SOIC (SO-8) package with standard DIP-8 pinout compatibility. Thermal resistance RθJA is 110.1 °C/W, supporting reliable operation up to +85°C ambient under typical PCB layout conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Trim) | Offset voltage adjustment input | Connect external 10-kΩ potentiometer between Pins 1 and 8 to null input offset; leave floating if unused. |
| 2 (–In) | Inverting input | Primary feedback node in inverting configurations; high-impedance (1 GΩ || 3 pF) bipolar input. |
| 3 (+In) | Noninverting input | Reference input for noninverting gain stages; matched impedance to Pin 2 for optimal CMRR. |
| 4 (V–) | Negative supply rail | Connect to lowest system voltage (e.g., –15 V); must be ≥0.7 V below signal common-mode range. |
| 5 (NC) | No internal connection | Not bonded; electrically isolated - may be left unconnected or tied to ground for mechanical stability. |
| 6 (Output) | Amplifier output | Capable of ±45 mA short-circuit current; drives ≥600 Ω loads with full swing within 3.5 V of rails. |
| 7 (V+) | Positive supply rail | Connect to highest system voltage (e.g., +15 V); must be ≤0.7 V above signal common-mode range. |
| 8 (Trim) | Offset voltage adjustment input | Second terminal of external trim network; symmetric use with Pin 1 enables bidirectional offset correction. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Operates stably at G = 1 without external compensation - simplifies design of buffers and active filters. |
| Low 10 nA max input bias current | Minimizes voltage error across high-impedance source networks (e.g., piezoelectric sensors, photodiode TIA feedback). |
| 160 dB open-loop gain | Enables <0.001% gain error in precision gain blocks using 100× closed-loop gain with 1% tolerance resistors. |
| –40°C to +85°C operating range | Qualified for industrial temperature environments without derating - supports embedded DAQ and test equipment deployment. |
| Pin-for-pin replacement for OP27 | Direct upgrade path with improved noise (3 vs 3.5 nV/√Hz), bandwidth (8 vs 8 MHz), and CMRR (138 vs 126 dB). |
Applications
| Data Acquisition System | Professional Audio Front-End |
|---|---|
Use Scenario: High-resolution (16–24-bit) analog input module acquiring thermocouple, strain gauge, or RTD signals in PLC or benchtop DAQ. IC Role / Device Role / Timing Role: Precision instrumentation amplifier input stage and ADC driver with low noise and low offset. Use Value: ±75 µV max offset and 3 nV/√Hz noise preserve effective resolution of 18+ bit systems without calibration overhead. | Use Scenario: Low-distortion microphone preamplifier or line-level buffer in rack-mount audio interfaces and mixing consoles. IC Role / Device Role / Timing Role: Unity-gain stable, low-THD+N signal buffer with wide bandwidth and rail-compatible output swing. Use Value: 0.00005% THD+N at 1 kHz and 138 dB CMRR suppress mains hum and crosstalk in multi-channel analog stages. |
| Spectrum Analyzer Input Stage | Industrial Sensor Signal Conditioning |
Use Scenario: Wideband, low-noise front-end amplifier preceding downconversion and FFT processing in portable spectrum analyzers. IC Role / Device Role / Timing Role: High-bandwidth, low-phase-noise gain block preserving signal integrity from DC to 8 MHz. Use Value: 8 MHz GBW and 2.3 V/µs slew rate support accurate amplitude measurement of transient RF envelope signals. | Use Scenario: Analog signal conditioning for vibration, pressure, or flow sensors in factory automation and predictive maintenance gateways. IC Role / Device Role / Timing Role: Low-drift, EMI-hardened amplifier driving isolated ADC inputs in harsh industrial environments. Use Value: ±0.6 µV/°C max drift and 120 dB CMRR over temperature ensure stable calibration across thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA227PA | Same electrical specs, but in PDIP-8 package with higher RθJA (48.9 °C/W) and no surface-mount compatibility. | Preferred for prototyping or through-hole legacy designs; unsuitable for space-constrained PCBs. | Select OPA227PA only when manual assembly or socket-based testing is required. |
| OPA228U | Higher 33 MHz bandwidth and 10 V/µs slew rate, but requires ≥G = 5 for stability; not unity-gain stable. | Better for closed-loop high-speed applications (e.g., active filters, composite amplifiers), not unity-gain buffers. | Choose OPA228U only when gain ≥5 is fixed and bandwidth >8 MHz is mandatory; otherwise OPA227U is safer and simpler. |
Compared with OPA227PA and OPA228U, the OPA227U uniquely combines SOIC packaging, unity-gain stability, and sub-100 µV offset - making it the optimal choice for production-ready, surface-mounted precision buffer and gain-stage designs where layout simplicity and thermal reliability are prioritized.
Availability
OPA227U is available at Aetrix Electronics and suitable for data acquisition systems, professional audio equipment, and industrial sensor signal conditioning requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for OPA227U 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 with deep expertise in precision amplifiers, data converters, and power management ICs.
The OPAx227 product line was engineered specifically for high-accuracy, low-noise analog signal chains in test & measurement, industrial process control, and professional audio - emphasizing dc precision, ac fidelity, and robustness across temperature and supply variations.
FAQ
What is the maximum operating temperature range for the OPA227U?
The OPA227U is specified to operate reliably from –40°C to +85°C ambient temperature. This industrial-grade range is validated across all key parameters including offset voltage, CMRR, and open-loop gain - ensuring consistent performance in factory automation, outdoor DAQ, and rack-mounted audio gear without thermal derating.
Does the OPA227U require external compensation capacitors?
No, the OPA227U is internally compensated for unity-gain stability and does not require external compensation capacitors. Its architecture guarantees stable operation at G = 1 across all load conditions and supply voltages within specification - eliminating design risk in buffer and follower configurations.
Can the OPA227U drive a 600-Ω load effectively?
Yes, the OPA227U delivers full output swing within 3.5 V of each rail into a 600-Ω load, and sustains ±45 mA short-circuit current. This capability supports direct interfacing with legacy audio line drivers, instrumentation test fixtures, and other low-impedance destinations without external buffering.
How does the OPA227U compare to the industry-standard OP27?
The OPA227U is a pin-for-pin replacement for the OP27 with measurable improvements: lower input voltage noise (3 vs 3.5 nV/√Hz), higher CMRR (138 vs 126 dB), tighter offset voltage (±75 µV vs ±100 µV), and identical 8 MHz bandwidth - making it a drop-in upgrade for existing OP27-based designs seeking enhanced precision.
Is the OPA227U suitable for single-supply operation?
Yes, the OPA227U supports single-supply operation from 4.5 V to 36 V (as VS = V+ – V–). When used with single supply, V– is connected to ground, and input common-mode range extends from (V– + 2 V) to (V+ – 2 V), enabling rail-splitter or reference-biased configurations for true single-supply signal chains.
OPA227U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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:
- 2.3V/µs
- Gain Bandwidth Product:
- 8 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2.5 nA
- Voltage - Input Offset:
- 5 µV
- Current - Supply:
- 3.7mA
- Current - Output / Channel:
- 45 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA227U FAQ
1.How can I place an order for OPA227U through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA227U 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 OPA227U reliable?
The price and inventory of OPA227U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA227U is usually 5 days.
3.What payment methods are accepted for OPA227U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA227U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA227U?
OPA227U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA227U 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 OPA227U?
For technical support, including OPA227U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA227U requirements.
6.How does Aetrix verify that OPA227U is sourced from the original manufacturer or authorized distributors?
All OPA227U 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 OPA227U meets industry standards.
7.What is the process for return or replacement of OPA227U?
All OPA227U units undergo pre-shipment inspection (PSI). If there is an issue with OPA227U, 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 OPA227U part is unused and in its original packaging.
Return procedure for OPA227U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA227U Tags
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