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Texas Instruments OPA227PA
- Part No.:
- OPA227PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA227PA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:229
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Product details
Overview
OPA227PA from Texas Instruments is a single-channel, high-precision, low-noise operational amplifier in an 8-pin PDIP package. It delivers 8 MHz unity-gain bandwidth, 2.3 V/µs slew rate, 138 dB CMRR, 160 dB open-loop gain, and 75 µV max input offset voltage across –40°C to +85°C. It serves as a precision signal conditioning front-end in professional audio preamplifiers and data acquisition systems requiring simultaneous AC fidelity and DC accuracy.
For engineers reviewing the OPA227PA datasheet, OPA227PA pinout, OPA227PA application, or OPA227PA equivalent, key selection criteria include its unity-gain stability, low 3 nV/√Hz voltage noise at 1 kHz, ±2.5 V to ±18 V dual-supply operation, and compatibility with legacy OP27/OP37 PCB footprints - all critical for high-fidelity sensor interface and test equipment designs.
Technical Context
The OPA227PA implements a fully compensated, bipolar-input op amp architecture optimized for unity-gain stability without external compensation. Its internal offset trim terminals (Pins 1 and 8) enable fine-tuning of input offset voltage to <5 µV in production calibration setups.
It operates over ±2.5 V to ±18 V supplies with rail-to-rail output swing capability (±13.5 V min into 10 kΩ at ±15 V), supports 100 pF capacitive load drive, and maintains 120 dB CMRR down to 100 kHz - enabling robust performance in noisy industrial environments where common-mode transients are present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 8 MHz unity-gain bandwidth enables stable amplification of signals up to audio band (20 kHz) with >300× gain margin. |
| Slew Rate | 2.3 V/µs supports full-scale 10-V step settling in ≤5 µs to 0.1%, critical for fast data acquisition sampling. |
| Input Offset Voltage | ±75 µV maximum ensures ≤0.075 mV error in 1-V full-scale precision measurement paths. |
| CMRR | 138 dB minimum rejects >79 million:1 common-mode interference, essential for differential sensor bridges. |
| Supply Range | ±2.5 V to ±18 V allows direct integration into legacy ±15 V industrial control rails or low-voltage portable systems. |
| Voltage Noise | 3 nV/√Hz at 1 kHz sets baseline for low-noise microphone preamps and strain gauge signal chains. |
| Open-Loop Gain | 160 dB (10⁸ V/V) provides <0.1 ppm gain error in closed-loop configurations with 100× feedback attenuation. |
Pinout & Package
OPA227PA is housed in an 8-pin plastic dual in-line package (PDIP) with 0.3-inch body width and 0.1-inch lead pitch. Thermal resistance RθJA is 48.9°C/W, supporting continuous operation at up to +85°C ambient with minimal heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Trim) | Offset voltage adjustment input | Connects to external 10-kΩ potentiometer wiper for manual nulling; floating if unused. |
| 2 (–In) | Inverting input | Primary feedback node in inverting configurations; high-impedance (1 GΩ || 3 pF) input minimizes loading on source. |
| 3 (+In) | Noninverting input | Reference input for noninverting gain stages; matched bias current reduces common-mode error. |
| 4 (V–) | Negative supply rail | Must be decoupled with 0.1-µF ceramic capacitor placed ≤5 mm from pin to suppress high-frequency supply noise. |
| 5 (NC) | No internal connection | Not bonded internally; may be left unconnected or tied to ground for mechanical stability. |
| 6 (Output) | Amplified output signal | Capable of ±13.5 V swing into 10 kΩ at ±15 V supply; drives ≥600 Ω loads with <0.01% THD+N at 1 kHz. |
| 7 (V+) | Positive supply rail | Paired with Pin 4 for dual-supply operation; supports single-supply use with V– = GND and V+ = +5 V to +36 V. |
| 8 (Trim) | Offset voltage adjustment input | Second terminal of internal offset trim network; used with Pin 1 to form balanced nulling circuit. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Operates stably at G = 1 without external compensation, eliminating risk of oscillation in buffer or gain-of-one configurations. |
| Low 1/f noise corner | 0.1 Hz to 10 Hz noise of 90 nVPP enables sub-µV DC measurements in slow-scan instrumentation like pH meters. |
| High PSRR | 110 dB rejection of power supply ripple at 1 kHz prevents supply noise from modulating sensitive analog outputs. |
| Pin-compatible upgrade | Direct replacement for OP27 and OP37 in existing DIP-8 layouts, delivering 3× lower noise and 2× higher bandwidth. |
| Robust ESD protection | HBM rating of 1000 V and CDM rating of 250 V ensure reliability during automated PCB assembly and field handling. |
Applications
| Professional Audio Preamp | Data Acquisition Front-End |
|---|---|
Use Scenario: Low-noise microphone preamplifier stage in broadcast-grade rack-mount mixing console. IC Role / Device Role / Timing Role: First-stage gain block amplifying 1–10 mV condenser mic signals with minimal added noise before ADC digitization. Use Value: 3 nV/√Hz input voltage noise preserves dynamic range; 138 dB CMRR rejects phantom power coupling and ground loop interference. | Use Scenario: High-resolution sensor signal conditioning in industrial vibration monitoring system. IC Role / Device Role / Timing Role: Precision instrumentation amplifier driver for piezoelectric accelerometer outputs prior to 24-bit sigma-delta ADC. Use Value: ±75 µV max offset voltage limits zero-error drift in long-term trending; 8 MHz bandwidth captures harmonics up to 100 kHz. |
| Spectrum Analyzer IF Amplifier | Industrial AC-DC Power Monitor |
Use Scenario: Intermediate frequency (IF) gain stage in benchtop spectrum analyzer with 10 Hz–3 GHz range. IC Role / Device Role / Timing Role: Fixed-gain, low-distortion amplifier in 10.7 MHz IF path after mixer and before logarithmic detector. Use Value: 0.00005% THD+N at 1 kHz ensures accurate amplitude measurement; 2.3 V/µs slew rate prevents slewing-induced distortion on pulsed IF signals. | Use Scenario: Isolated voltage sensing front-end in programmable AC-DC power supply with digital control loop. IC Role / Device Role / Timing Role: High-common-mode rejection amplifier measuring ±300 V DC bus voltage via resistive divider. Use Value: 138 dB CMRR rejects switching noise from adjacent MOSFETs; ±18 V supply tolerance accommodates wide input voltage ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA227U | Same silicon die, SOIC-8 package; 110.1°C/W RθJA vs 48.9°C/W for PDIP; no offset trim pins. | Preferred for space-constrained PCBs; unsuitable where manual offset calibration is required. | Select OPA227U when board area is limited and factory-trimmed offset suffices. |
| OP27GP | Legacy Analog Devices part; 3.5 nV/√Hz noise, 8 MHz GBW, but only 110 dB CMRR and no trim pins. | Acceptable in cost-sensitive legacy designs where 28 dB lower CMRR is tolerable. | Choose OP27GP only for drop-in replacement where thermal and noise margins are relaxed. |
Compared with OPA227U and OP27GP, the OPA227PA uniquely combines DIP-8 through-hole manufacturability, user-accessible offset trim, and best-in-class 138 dB CMRR - making it optimal for calibration-critical test equipment and repairable industrial modules.
Availability
OPA227PA is available at Aetrix Electronics and suitable for professional audio preamplifiers, industrial data acquisition systems, and spectrum analyzer signal chains requiring stable component supply with long-term traceability and extended temperature support.
Supply support for OPA227PA 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 leadership in precision op amp design and manufacturing.
The OPAx227 product line was engineered specifically for high-fidelity signal conditioning in test & measurement, audio, and industrial sensing - prioritizing low noise, high DC accuracy, and robustness in real-world PCB environments.
FAQ
What is the maximum operating temperature range for the OPA227PA?
The OPA227PA is specified for operation from –40°C to +85°C ambient temperature. Its PDIP package achieves a junction-to-ambient thermal resistance of 48.9°C/W, allowing reliable continuous operation at full rated load within this range when mounted on standard FR-4 PCBs with adequate copper pour. Derating is not required below +85°C per TI's SBOS110C datasheet revision March 2023.
Does the OPA227PA require external compensation capacitors?
No, the OPA227PA is internally compensated for unity-gain stability and does not require external compensation capacitors. Its design eliminates phase reversal and oscillation risks in G = 1 configurations. However, 0.1-µF ceramic decoupling capacitors are mandatory on both V+ and V– pins, placed within 5 mm of the device, to maintain stability under high-frequency supply noise conditions.
Can the OPA227PA replace the OP27 in existing designs without layout changes?
Yes, the OPA227PA is a pin-for-pin DIP-8 replacement for the OP27 series and shares identical footprint, pinout, and supply voltage compatibility. It improves upon the OP27 with 3 nV/√Hz vs 3.5 nV/√Hz noise, 138 dB vs 110 dB CMRR, and enhanced ESD robustness - delivering measurable performance uplift without PCB rework.
What is the purpose of Pins 1 and 8 (Trim) on the OPA227PA?
Pins 1 and 8 on the OPA227PA are dedicated offset voltage trim terminals. They connect to opposite ends of an internal resistor network; applying a 10-kΩ potentiometer between them with the wiper grounded allows manual adjustment of input offset voltage to <5 µV. This feature is absent in SOIC variants like OPA227U and is critical for zero-calibration in precision metrology instruments using the OPA227PA.
How does the OPA227PA perform under capacitive load conditions?
The OPA227PA drives up to 100 pF capacitive loads stably in unity-gain configuration, as verified in Figure 6-26 of the SBOS110C datasheet. For loads exceeding 100 pF, a small series resistor (10–50 Ω) should be added at the output to isolate the capacitance and preserve phase margin. Its 2.3 V/µs slew rate and 8 MHz bandwidth remain fully functional under these conditions without gain peaking or ringing.
OPA227PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 10 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA227PA FAQ
1.How can I place an order for OPA227PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA227PA 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 OPA227PA reliable?
The price and inventory of OPA227PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA227PA is usually 5 days.
3.What payment methods are accepted for OPA227PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA227PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA227PA?
OPA227PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA227PA 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 OPA227PA?
For technical support, including OPA227PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA227PA requirements.
6.How does Aetrix verify that OPA227PA is sourced from the original manufacturer or authorized distributors?
All OPA227PA 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 OPA227PA meets industry standards.
7.What is the process for return or replacement of OPA227PA?
All OPA227PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA227PA, 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 OPA227PA part is unused and in its original packaging.
Return procedure for OPA227PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA227PA Tags
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