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Texas Instruments OPA227U/2K5
- Part No.:
- OPA227U/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA227U/2K5.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,670
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Product details
Overview
OPA227U/2K5 from Texas Instruments is a dual-channel, high-precision, low-noise operational amplifier in an SOIC-8 package, delivering 8 MHz unity-gain bandwidth, 2.3 V/µs slew rate, and 3 nV/√Hz input voltage noise density. It features 138 dB CMRR, 160 dB open-loop gain, and ±75 µV max input offset voltage, enabling high-fidelity signal conditioning in data acquisition front-ends and professional audio preamplifiers.
For engineers reviewing the OPA227U/2K5 datasheet, OPA227U/2K5 pinout, OPA227U/2K5 application, or OPA227U/2K5 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 validated performance across –40°C to +85°C industrial temperature range.
Technical Context
The OPA227U/2K5 implements a precision bipolar input stage with internal offset trim capability (Pins 1 and 8), supporting dc-critical applications requiring long-term stability and minimal thermal drift. Its unity-gain stable architecture eliminates need for external compensation in G = 1 configurations, while maintaining 5 µs settling time to 0.1% for 10-V steps.
Unlike the higher-speed OPA228 family, the OPA227U/2K5 is optimized for general-purpose precision amplification - not minimum-gain-constrained designs - and shares pin compatibility with industry-standard OP27/OP37 op amps, enabling drop-in upgrades with improved noise, gain, and PSRR performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 8 MHz unity-gain bandwidth enables accurate amplification of signals up to audio and low-MHz instrumentation frequencies without phase loss. |
| Slew Rate | 2.3 V/µs supports clean reproduction of fast transients in sensor interfaces and DAC output buffers without slew-induced distortion. |
| Input Noise Density | 3 nV/√Hz at 1 kHz ensures minimal added noise in low-level signal chains such as strain gauge or thermocouple amplifiers. |
| CMRR | 138 dB common-mode rejection suppresses power supply ripple and ground noise in single-supply or noisy industrial environments. |
| Offset Voltage | ±75 µV maximum (U-grade) guarantees sub-100 µV dc error in precision gain stages, reducing calibration burden in production test. |
| Supply Range | ±2.5 V to ±18 V dual supply allows flexible integration into legacy ±5 V, ±12 V, or ±15 V systems without level-shifting circuitry. |
| Operating Temp | –40°C to +85°C industrial temperature rating validates use in factory automation, test equipment, and outdoor instrumentation. |
Pinout & Package
OPA227U/2K5 is housed in an 8-pin SOIC (SO-8) package with standard dual-op-amp pinout. Thermal resistance RθJA is 110.1°C/W, requiring moderate PCB copper area for thermal management in continuous high-output-current operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim A | Adjusts input offset voltage for Channel A; leave floating if unused - no external connection required for standard operation. |
| 2 | Inverting Input A | Primary negative feedback node for Channel A; high-impedance input accepts signals from sensors or DACs without loading. |
| 3 | Noninverting Input A | Reference input for Channel A; matched impedance to Pin 2 minimizes thermal EMF errors in precision dc circuits. |
| 4 | V− | Negative supply rail shared by both amplifiers; must be decoupled with 0.1 µF ceramic capacitor near the pin. |
| 5 | Noninverting Input B | Reference input for Channel B; electrically isolated from Channel A but shares same V− and V+ rails. |
| 6 | Inverting Input B | Negative feedback node for Channel B; identical electrical characteristics to Pin 2 for matched dual-channel performance. |
| 7 | Output B | Amplified output of Channel B; capable of ±45 mA short-circuit current and rail-to-rail swing within 2 V of supplies. |
| 8 | V+ | Positive supply rail shared by both amplifiers; requires local 0.1 µF ceramic decoupling to maintain PSRR above 110 dB. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable | Operates reliably at G = 1 without external compensation, simplifying design of buffer, integrator, and active filter stages. |
| Low 10 nA max input bias current | Minimizes voltage error across high-value feedback resistors (e.g., >100 kΩ), preserving gain accuracy in high-Z sensor interfaces. |
| 160 dB open-loop gain | Enables <0.001% gain error in closed-loop configurations using 10 kΩ–100 kΩ resistor networks, critical for calibrated measurement systems. |
| Pin-compatible with OP27/OP37 | Direct replacement in existing designs without PCB layout changes, delivering immediate noise, speed, and precision improvements. |
| 0.1 µV/°C max offset drift | Reduces thermal-induced calibration drift in uncooled enclosures, extending recalibration intervals in field-deployed instruments. |
Applications
| Data Acquisition Front-End | Professional Audio Preamp |
|---|---|
Use Scenario: Amplifying low-level analog outputs from 24-bit delta-sigma ADC reference buffers and multiplexed sensor arrays. IC Role / Device Role / Timing Role: Dual-channel precision gain stage with matched channel performance for simultaneous sampling and correlated noise rejection. Use Value: 3 nV/√Hz noise floor preserves ENOB in 120-dB dynamic range systems; 138 dB CMRR rejects shared supply noise between channels. |
Use Scenario: Low-distortion microphone preamplification and line-level signal routing in rack-mount audio consoles. IC Role / Device Role / Timing Role: Dual-channel DC-coupled gain block with ultra-low THD+N (0.00005%) for transparent signal path integrity. Use Value: ±75 µV offset ensures <1 mV dc error at 60 dB gain; 8 MHz bandwidth supports full 20 Hz–20 kHz audio spectrum with margin. |
| Industrial Condition Monitoring | Spectrum Analyzer IF Stage |
Use Scenario: Signal conditioning for vibration, temperature, and pressure transducers in predictive maintenance gateways. IC Role / Device Role / Timing Role: Dual-channel antialiasing filter driver and programmable gain amplifier before SAR ADC sampling. Use Value: ±2.5 V to ±18 V supply range accommodates diverse sensor excitation schemes; –40°C to +85°C rating ensures reliability in harsh enclosures. |
Use Scenario: Intermediate-frequency amplification and filtering in portable RF spectrum analyzers operating up to 100 MHz. IC Role / Device Role / Timing Role: Stable, low-noise IF gain block with precise amplitude control prior to envelope detection or FFT processing. Use Value: 5 µs settling time enables accurate amplitude measurement of pulsed RF signals; 110 dB PSRR suppresses LO leakage artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA227P | DIP-8 package; higher RθJA (48.9°C/W vs. 110.1°C/W); same electrical specs. | Better suited for prototyping or through-hole manufacturing; less suitable for high-density PCBs. | Select OPA227P only when manual assembly or breadboard validation is required. |
| OPA2227U | Dual-channel variant with identical SOIC-8 footprint but different internal trimming and tighter offset drift (±0.1 µV/°C typical). | Targeted at metrology-grade instruments where long-term calibration stability is prioritized over cost. | Choose OPA2227U when drift-critical applications demand <0.2 µV/°C max drift over full temperature range. |
Compared with OPA227P and OPA2227U, the OPA227U/2K5 offers optimal balance of industrial temperature support, SOIC-8 surface-mount compatibility, and production-ready U-grade precision - making it the preferred choice for volume-manufactured test equipment and embedded DAQ modules.
Availability
OPA227U/2K5 is available at Aetrix Electronics and suitable for data acquisition front-ends, professional audio preamplifiers, and industrial condition monitoring systems requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for OPA227U/2K5 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 precision op amp design and manufacturing excellence.
The OPAx227 series was developed to replace legacy OP27/OP37 op amps in high-accuracy instrumentation, offering superior noise, bandwidth, and dc precision while maintaining full pin compatibility and industrial temperature operation.
FAQ
What is the maximum supply voltage for OPA227U/2K5?
The OPA227U/2K5 supports dual-supply operation from ±2.5 V to ±18 V, with absolute maximum ratings specifying ±18 V. Exceeding ±18 V risks permanent damage. For reliable long-term operation, TI recommends staying within ±15 V under normal conditions, especially at elevated temperatures.
Is OPA227U/2K5 unity-gain stable?
Yes, the OPA227U/2K5 is explicitly unity-gain stable per TI's SBOS110C datasheet. It does not require external compensation for G = 1 configurations, unlike the OPA228 family. This makes OPA227U/2K5 ideal for voltage followers, active filters, and precision buffers without added complexity.
Does OPA227U/2K5 have internal ESD protection?
Yes, OPA227U/2K5 includes on-chip ESD protection rated at 1000 V HBM and 250 V CDM per JEDEC standards. While this enables robust handling during assembly, TI still recommends standard ESD precautions - including grounded workstations and ionized air - during PCB handling and reflow.
Can OPA227U/2K5 drive capacitive loads?
OPA227U/2K5 can drive moderate capacitive loads (≤100 pF) stably in unity-gain configuration. For larger loads (e.g., >500 pF), TI recommends adding a small isolation resistor (10–50 Ω) in series with the output to maintain phase margin. Figure 6-26 in the datasheet quantifies overshoot vs. load capacitance.
What is the quiescent current of OPA227U/2K5?
The OPA227U/2K5 draws ±3.7 mA to ±3.8 mA per amplifier at room temperature (25°C) and ±15 V supply, totaling ~7.6 mA for both channels. Quiescent current increases slightly with temperature and supply voltage, reaching ±4.2 mA per amplifier at +85°C.
OPA227U/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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/2K5 FAQ
1.How can I place an order for OPA227U/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA227U/2K5 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/2K5 reliable?
The price and inventory of OPA227U/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA227U/2K5 is usually 5 days.
3.What payment methods are accepted for OPA227U/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA227U/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA227U/2K5?
OPA227U/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA227U/2K5 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/2K5?
For technical support, including OPA227U/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA227U/2K5 requirements.
6.How does Aetrix verify that OPA227U/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA227U/2K5 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/2K5 meets industry standards.
7.What is the process for return or replacement of OPA227U/2K5?
All OPA227U/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA227U/2K5, 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/2K5 part is unused and in its original packaging.
Return procedure for OPA227U/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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