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Texas Instruments OPA227PG4
- Part No.:
- OPA227PG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA227PG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,049
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Product details
Overview
OPA227PG4 from Texas Instruments is a single-channel, high-precision, low-noise operational amplifier in an 8-pin PDIP package, delivering 8 MHz unity-gain bandwidth, 2.3 V/µs slew rate, 138 dB CMRR, and ≤75 µV input offset voltage. It operates from ±2.5 V to ±18 V supplies and is optimized for precision data acquisition, professional audio signal conditioning, and spectrum analyzer front-ends where ac fidelity and dc accuracy coexist.
For engineers reviewing the OPA227PG4 datasheet, OPA227PG4 pinout, OPA227PG4 application, or OPA227PG4 equivalent, key selection criteria include its unity-gain stability, low 3 nV/√Hz voltage noise at 1 kHz, wide supply range, and compatibility with legacy OP27/OP37 layouts-enabling drop-in upgrades in existing high-performance analog signal chains without redesign.
Technical Context
The OPA227PG4 employs a precision bipolar input stage with internal offset trim capability (Pins 1 and 8), enabling fine-tuning of input offset voltage in critical dc-coupled applications. Its unity-gain stable architecture supports stable operation down to G = 1 with minimal phase margin degradation across temperature and load conditions.
It features high open-loop gain (160 dB typical), low input bias current (≤10 nA), and robust common-mode rejection (138 dB) over –40°C to +85°C, making it suitable for high-resolution sensor interfaces and precision instrumentation where signal integrity must be preserved under varying supply and thermal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 8 MHz unity-gain bandwidth enables accurate amplification of signals up to audio and low-RF frequencies without gain peaking. |
| Slew Rate | 2.3 V/µs supports clean reproduction of fast transients in data acquisition systems with ≥10-V step inputs. |
| Input Offset Voltage | ≤75 µV max ensures sub-0.01% error in 12-bit+ measurement systems operating at ±15 V supplies. |
| CMRR | 138 dB minimizes error from power supply ripple or ground noise in single-supply or dual-supply configurations. |
| Voltage Noise Density | 3 nV/√Hz at 1 kHz directly limits detectable signal resolution in low-level sensor amplification stages. |
| Supply Range | ±2.5 V to ±18 V allows use in both portable battery-powered and industrial line-powered equipment without level-shifting. |
| Operating Temperature | –40°C to +85°C rated performance supports deployment in industrial control cabinets and outdoor test equipment. |
Pinout & Package
OPA227PG4 is housed in an 8-pin plastic DIP (PDIP-8) package with through-hole mounting and standard pin spacing (0.300″ width). Pin 1 is offset by a notch or dot marking on the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (Input) | Connects to external 10-kΩ potentiometer wiper for manual nulling of input offset voltage; leave floating if unused. |
| 2 | Inverting Input (–In) | Primary negative feedback node; sensitive to layout-induced leakage and thermal gradients. |
| 3 | Noninverting Input (+In) | High-impedance input node requiring symmetric trace routing and guard ring for optimal CMRR. |
| 4 | V− | Negative supply rail connection; requires local 0.1-µF ceramic decoupling capacitor. |
| 5 | NC | No internal connection; electrically isolated and may be left unconnected or grounded for mechanical stability. |
| 6 | Output | Capable of driving ≥600 Ω loads with ≤2-V headroom; output swing limited to (V−)+2 V to (V+)+2 V. |
| 7 | V+ | Positive supply rail connection; requires local 0.1-µF ceramic decoupling capacitor. |
| 8 | Offset Trim | Second trim terminal completing the offset adjustment network; used with Pin 1 and external resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Guaranteed stable at G = 1 without external compensation, simplifying design in buffer and gain-of-one configurations. |
| Low 1/f noise | 90 nVPP integrated 0.1 Hz–10 Hz noise enables high-accuracy dc measurements in weigh scales and thermocouple amplifiers. |
| High PSRR | ≥110 dB at 1 kHz rejects switching regulator ripple and mains-borne noise in mixed-signal PCBs. |
| Pin-compatible upgrade | Direct replacement for OP27 and OP37 with identical pinout and improved noise, speed, and CMRR-no PCB changes required. |
| Thermal drift control | ±0.6 µV/°C max offset drift ensures <1 µV total drift over 40°C ambient variation in lab-grade instruments. |
Applications
| Data Acquisition System | Professional Audio Signal Chain |
|---|---|
Use Scenario: High-resolution ADC front-end in 16-bit+ benchtop DAQ modules sampling at ≤100 kSPS with simultaneous multi-channel acquisition. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage and anti-aliasing filter driver, preserving SNR and linearity across full input range. Use Value: 3 nV/√Hz noise and 138 dB CMRR maintain >90 dB effective number of bits (ENOB) at ±10 V input spans. | Use Scenario: Low-distortion microphone preamplifier and line-level buffer in rack-mount audio analyzers and digital mixing consoles. IC Role / Device Role / Timing Role: Primary gain block with ultra-low THD+N (0.00005%) and flat frequency response up to 20 kHz. Use Value: 2.3 V/µs slew rate prevents slew-induced distortion on transient-rich program material while maintaining <75 µV offset for DC-coupled topology. |
| Spectrum Analyzer Front-End | Industrial Condition Monitoring Sensor Interface |
Use Scenario: Wideband IF amplifier and detector buffer in portable RF spectrum analyzers covering 9 kHz–3 GHz with real-time FFT processing. IC Role / Device Role / Timing Role: Stable intermediate-frequency gain stage with 8 MHz bandwidth and minimal group delay variation. Use Value: Unity-gain stability and 5 µs settling time to 0.1% enable accurate amplitude measurement of narrowband signals without overshoot artifacts. | Use Scenario: Signal conditioning for piezoelectric vibration sensors and strain-gauge bridges in predictive maintenance gateways deployed in factory environments. IC Role / Device Role / Timing Role: Low-drift, low-noise instrumentation amplifier input stage with extended temperature range support. Use Value: ±10 nA input bias current and –40°C to +85°C operation ensure reliable bridge excitation and differential gain without thermal zero-shift errors. |
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 |
|---|---|---|---|
| OPA227UA | Same silicon die, SOIC-8 package; no offset trim pins; 0.6 µV/°C max drift vs. 0.1 µV/°C typ for PG4 grade. | Preferred for space-constrained PCBs where trimming is unnecessary and thermal drift budget permits. | Select OPA227UA when board area is constrained and offset trim is not required; PG4 retains trim flexibility for highest dc precision. |
| OP27GP | Legacy TI part; 80 nV/√Hz noise, 120 dB CMRR, 2.8 V/µs slew rate; no trim pins; wider offset distribution (±25 µV typ). | Used in cost-sensitive legacy designs where moderate noise and drift are acceptable. | Choose OP27GP only for backward compatibility; OPA227PG4 delivers measurable improvement in noise, CMRR, and offset control. |
Compared with OPA227UA and OP27GP, the OPA227PG4 uniquely combines accessible offset trim, superior 3 nV/√Hz noise, and guaranteed 138 dB CMRR-making it the optimal choice for new designs demanding maximum dc accuracy and ac fidelity in a through-hole package.
Availability
OPA227PG4 is available at Aetrix Electronics and suitable for data acquisition systems, professional audio equipment, and industrial condition monitoring sensors requiring stable component supply and long-term manufacturability.
Supply support for OPA227PG4 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 expertise in precision amplifiers and signal-chain solutions.
The OPAx227 series was designed specifically for high-fidelity analog signal paths requiring simultaneous excellence in dc precision (low offset, drift, bias current) and ac performance (bandwidth, slew rate, noise), targeting test & measurement, audio, and industrial sensing.
FAQ
What is the maximum supply voltage for OPA227PG4?
The OPA227PG4 supports a maximum dual-supply voltage of ±18 V (36 V total), with absolute maximum ratings specifying ±18 V across V+ and V− pins. Operation beyond this risks permanent damage. Recommended operating range is ±2.25 V to ±15 V for guaranteed specifications; ±18 V is allowed but may reduce long-term reliability under sustained stress.
Does OPA227PG4 require external compensation capacitors?
No, the OPA227PG4 is unity-gain stable and does not require external compensation capacitors for stable operation at G = 1. Its internal compensation ensures phase margin >60° across temperature and load conditions. External capacitors are only needed for offset trimming (Pins 1 and 8) or power supply decoupling (0.1 µF ceramic per supply pin).
Can OPA227PG4 drive a 600 Ω load?
Yes, the OPA227PG4 can drive a 600 Ω load with specified output voltage swing of (V−)+3.5 V to (V+)+3.5 V at ±15 V supplies. Short-circuit current is ±45 mA, supporting full-scale output into 600 Ω with ≤2% THD+N at 1 kHz. For sustained high-current operation, thermal derating per RθJA = 48.9°C/W should be observed.
Is OPA227PG4 pin-compatible with OP27?
Yes, OPA227PG4 is a direct pin-compatible replacement for OP27GP and OP27EP in PDIP-8 packages, sharing identical pinout, footprint, and supply connections. It improves upon OP27 with lower noise (3 vs. 80 nV/√Hz), higher CMRR (138 vs. 120 dB), and accessible offset trim-enabling drop-in upgrades without PCB modification.
What is the purpose of Pins 1 and 8 on OPA227PG4?
Pins 1 and 8 on OPA227PG4 are dedicated offset voltage trim terminals. Connecting a 10-kΩ potentiometer between them-with the wiper tied to V−-allows manual nulling of input offset voltage to <1 µV in critical dc applications. Leaving both pins unconnected maintains standard operation with ≤75 µV max offset, as specified.
OPA227PG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
- 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
OPA227PG4 FAQ
1.How can I place an order for OPA227PG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA227PG4 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 OPA227PG4 reliable?
The price and inventory of OPA227PG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA227PG4 is usually 5 days.
3.What payment methods are accepted for OPA227PG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA227PG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA227PG4?
OPA227PG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA227PG4 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 OPA227PG4?
For technical support, including OPA227PG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA227PG4 requirements.
6.How does Aetrix verify that OPA227PG4 is sourced from the original manufacturer or authorized distributors?
All OPA227PG4 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 OPA227PG4 meets industry standards.
7.What is the process for return or replacement of OPA227PG4?
All OPA227PG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA227PG4, 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 OPA227PG4 part is unused and in its original packaging.
Return procedure for OPA227PG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA227PG4 Tags
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