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Texas Instruments OPA2227PA
- Part No.:
- OPA2227PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA2227PA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
OPA2227PA from Texas Instruments is a dual, high-precision, low-noise operational amplifier in an 8-pin PDIP package. It delivers 3 nV/√Hz input voltage noise, 8 MHz gain bandwidth, 2.3 V/µs slew rate, and ±75 µV max input offset voltage at 25°C - enabling high-fidelity signal conditioning in professional audio, data acquisition, and spectral analysis systems.
For engineers reviewing the OPA2227PA datasheet, OPA2227PA pinout, OPA2227PA application, or OPA2227PA equivalent, key selection considerations include its unity-gain stability, ±2.5 V to ±18 V supply range, dual-channel isolation, low 10 nA input bias current, and compatibility with precision DC + AC performance requirements in low-distortion analog front-ends.
Technical Context
The OPA2227PA implements a bipolar-input, fully differential input stage optimized for low 1/f and broadband voltage noise. Its internal compensation ensures unity-gain stability without external components, supporting robust closed-loop operation across gains of 1 to 100.
It features laser-trimmed input offset voltage and drift (±0.1 µV/°C typ), high 138 dB CMRR, and rail-to-rail output swing capability within ±2 V of supplies - all specified over –40°C to +85°C with guaranteed performance from ±5 V to ±15 V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 3 nV/√Hz @ 1 kHz - enables sub-100 µVpp noise floor in 20 kHz audio band |
| Gain Bandwidth Product | 8 MHz - supports stable G=1 to G=10 amplification with ≤1% settling error |
| Slew Rate | 2.3 V/µs - allows full-scale 10 V step response in ≤5 µs with 0.01% accuracy |
| Input Offset Voltage | ±75 µV max @ 25°C - achieves ≤0.00075% gain error in 10 V full-scale systems |
| Supply Range | ±2.5 V to ±18 V - operates from single 5 V up to ±15 V rails without derating |
| CMRR | 138 dB min - rejects >79 million:1 common-mode interference in sensor interfaces |
| Quiescent Current | ±3.7 mA per channel - balances precision and power in battery-powered instrumentation |
Pinout & Package
OPA2227PA is housed in an 8-pin plastic dual in-line package (PDIP) with 9.81 mm × 6.35 mm body size and through-hole mounting. Pin 1 is Out A, Pin 2 is –In A, Pin 3 is +In A, Pin 4 is V–, Pin 5 is +In B, Pin 6 is –In B, Pin 7 is Out B, and Pin 8 is V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplified output signal for Channel A; drives 10 kΩ load to within ±2 V of rails |
| 2 | –In A | Inverting input for Channel A; high-impedance node (10⁷ Ω || 12 pF) |
| 3 | +In A | Noninverting input for Channel A; matched impedance to –In A for CMRR optimization |
| 4 | V– | Negative supply terminal; must be decoupled with 0.1 µF capacitor near pin |
| 5 | +In B | Noninverting input for Channel B; electrically isolated from Channel A (≥120 dB separation) |
| 6 | –In B | Inverting input for Channel B; independent bias current path (≤10 nA max) |
| 7 | Out B | Amplified output signal for Channel B; identical AC/DC specs to Out A |
| 8 | V+ | Positive supply terminal; accepts up to ±18 V; requires local 0.1 µF decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Low 1/f noise corner | 10 Hz - preserves signal integrity in DC-coupled geophysical sensors |
| Unity-gain stability | No external compensation required - simplifies layout and reduces BOM count |
| Channel separation | ≥120 dB at DC - prevents crosstalk in dual-channel active filters and instrumentation amps |
| Thermal drift control | ±0.1 µV/°C typical - maintains calibration stability across industrial temperature range |
| Wide supply flexibility | Operates from ±2.5 V to ±18 V - supports both low-voltage portable and high-dynamic-range test equipment |
Applications
| Professional Audio Signal Chain | Data Acquisition Front-End |
|---|---|
Use Scenario: Low-noise preamplification and summing of microphone signals in studio-grade mixing consoles. IC Role / Device Role / Timing Role: Dual-channel precision op amp providing gain, buffering, and common-mode rejection before ADC sampling. Use Value: 3 nV/√Hz noise density and 138 dB CMRR preserve dynamic range and stereo imaging fidelity. | Use Scenario: Conditioning low-level thermocouple and strain gauge outputs in 24-bit DAQ modules. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end with matched gain paths and offset trimming. Use Value: ±75 µV max offset and ±0.1 µV/°C drift minimize calibration drift over temperature cycles. |
| Vibration Analysis System | Spectral Analysis Instrumentation |
Use Scenario: Amplifying piezoelectric accelerometer outputs in structural health monitoring equipment. IC Role / Device Role / Timing Role: Dual-channel charge-to-voltage converter and anti-alias filter driver. Use Value: 8 MHz GBW and 2.3 V/µs slew rate support accurate reproduction of 100 kHz transients. | Use Scenario: High-resolution FFT-based spectrum analyzers requiring ultra-low distortion analog signal paths. IC Role / Device Role / Timing Role: Dual-channel low-noise gain stage preceding RF mixer and digitizer stages. Use Value: 0.00005% THD+N at 1 kHz ensures minimal harmonic contamination in frequency-domain measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2189IDR | Zero-drift architecture; 5.2 nV/√Hz noise; 10 MHz GBW; 20 V/µs slew rate | Better DC accuracy (±1 µV offset), but higher noise above 100 Hz limits audio use | Select when long-term DC stability outweighs broadband noise performance |
| LT1028ACN8#PBF | Bipolar input; 0.85 nV/√Hz noise; 50 MHz GBW; 15 V/µs slew rate; no dual version | Superior noise and speed, but single-channel only and requires external compensation | Select for ultra-low-noise single-channel applications where layout space permits discrete compensation |
Compared with OPA2227PA, OPA2189IDR offers superior DC drift performance but trades 70% higher voltage noise above 1 kHz, while LT1028ACN8#PBF delivers best-in-class noise and bandwidth but lacks dual-channel integration and unity-gain stability - making OPA2227PA optimal for space-constrained, dual-channel, AC+DC precision designs.
Availability
OPA2227PA is available at Aetrix Electronics and suitable for professional audio equipment, data acquisition systems, vibration analysis hardware, and spectral analysis instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA2227PA 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 OPAx22x product line was designed specifically for high-precision, low-noise analog signal conditioning - bridging AC performance and DC accuracy in measurement, audio, and scientific instrumentation.
FAQ
What is the maximum operating supply voltage for the OPA2227PA?
The OPA2227PA supports a total supply voltage range of ±2.5 V to ±18 V, with absolute maximum ratings up to ±18 V on each rail. The device is rated for continuous operation at ±15 V and can withstand transient conditions up to ±18 V. Exceeding ±18 V risks permanent damage per Absolute Maximum Ratings in the TI SBOS110B datasheet.
Does the OPA2227PA require external compensation capacitors?
No, the OPA2227PA is internally compensated for unity-gain stability and does not require external compensation capacitors. Its design eliminates the need for external phase compensation networks, simplifying PCB layout and reducing component count in gain-of-1, gain-of-2, or higher configurations - unlike the OPA2228 which requires minimum closed-loop gain ≥5.
How does the OPA2227PA compare to the OPA227PA in terms of pin compatibility and performance?
The OPA2227PA and OPA227PA are not pin-compatible: OPA2227PA is a dual op amp (8-pin PDIP, pins 1–7 assigned to two channels), while OPA227PA is a single op amp (8-pin PDIP with offset trim pins). Performance differs in channel count, noise (both specify 3 nV/√Hz), and GBW (8 MHz for both), but OPA2227PA adds dual-channel isolation and eliminates trim pins to maximize functional density.
What is the typical input bias current of the OPA2227PA over temperature?
The OPA2227PA specifies a maximum input bias current of ±10 nA over the full –40°C to +85°C operating range. At 25°C, typical bias current is ±2.5 nA, and it remains stable across temperature - confirmed by Figure 15 in the SBOS110B datasheet showing <±3 nA variation from –40°C to +125°C under ±15 V supply.
Can the OPA2227PA drive capacitive loads without instability?
The OPA2227PA can drive moderate capacitive loads (≤100 pF) directly, but larger loads require isolation. Figure 26 shows overshoot increases beyond 100 pF at G=±1; TI recommends adding a 20–100 Ω series resistor between output and load for >100 pF capacitance. This maintains phase margin and prevents peaking or oscillation in active filter or cable-driving applications.
OPA2227PA 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:
- 2
- 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 (x2 Channels)
- 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
OPA2227PA FAQ
1.How can I place an order for OPA2227PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2227PA 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 OPA2227PA reliable?
The price and inventory of OPA2227PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2227PA is usually 5 days.
3.What payment methods are accepted for OPA2227PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2227PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2227PA?
OPA2227PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2227PA 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 OPA2227PA?
For technical support, including OPA2227PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2227PA requirements.
6.How does Aetrix verify that OPA2227PA is sourced from the original manufacturer or authorized distributors?
All OPA2227PA 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 OPA2227PA meets industry standards.
7.What is the process for return or replacement of OPA2227PA?
All OPA2227PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA2227PA, 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 OPA2227PA part is unused and in its original packaging.
Return procedure for OPA2227PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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