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Texas Instruments OPA227UA/2K5G4
- Part No.:
- OPA227UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA227UA/2K5G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,540
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Product details
Overview
OPA227UA/2K5G4 from Texas Instruments is a dual high-precision operational amplifier optimized for low-drift, low-noise DC-coupled signal conditioning in industrial measurement systems. It delivers 10 µV max input offset voltage, ±0.1 µV/°C drift, 134 dB open-loop gain, and operates from ±2 V to ±18 V supplies. Used in weigh scales and temperature transmitters where long-term stability and minimal thermal error are critical.
For engineers reviewing the OPA227UA/2K5G4 datasheet, OPA227UA/2K5G4 pinout, OPA227UA/2K5G4 application, or OPA227UA/2K5G4 equivalent, key selection criteria include ultra-low drift performance across –40°C to +85°C, dual-channel independence for multi-sensor front-ends, SOIC-8 package compatibility with legacy OP-177 layouts, and absence of phase inversion under overload.
Technical Context
The OPA227UA/2K5G4 implements a laser-trimmed bipolar input stage with internal bias current cancellation, eliminating need for external compensation resistors. Its architecture maintains 140 dB CMRR and 130 dB PSRR over ±5 V to ±15 V supply range - a single specification covering real-world dual-supply operation.
It features fully independent dual amplifiers with no crosstalk coupling, unity-gain stability without external compensation, and input protection enabling ±30 V differential input tolerance. The SOIC-8 package (D) supports standard 3.91 mm × 4.90 mm PCB footprints used for precision analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±10 µV (max at 25°C); enables sub-0.01% accuracy in 16-bit DAQ front-ends without trimming |
| Offset Drift | ±0.1 µV/°C (max over –40°C to +85°C); ensures <1 µV total drift across full industrial temp range |
| Open-Loop Gain | 134 dB (min); provides >500,000 V/V loop gain for stable closed-loop gain accuracy in sensor bridges |
| CMRR / PSRR | 140 dB / 130 dB (min); rejects power supply ripple and common-mode noise in noisy plant environments |
| Quiescent Current | 800 µA per amplifier; allows dual-channel precision amplification within 1.6 mA total budget for battery-powered field instruments |
| Supply Range | ±2 V to ±18 V; supports direct interface to ±5 V, ±12 V, and ±15 V industrial rails without regulation |
| Input Bias Current | ±1 nA (max); permits use with high-impedance pH electrodes and thermopile sensors without guard traces |
Pinout & Package
OPA227UA/2K5G4 is supplied in an 8-pin SOIC (D) package measuring 3.91 mm × 4.90 mm, compatible with standard surface-mount assembly processes and legacy OP-177 footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output; drives loads up to ±35 mA with rail-to-rail swing limited by supply headroom |
| 2 | –In A | Inverting input for channel A; internally compensated for bias current - no external resistor required |
| 3 | +In A | Noninverting input for channel A; EMI-optimized input with 1 kΩ series protection and diode clamps |
| 4 | V– | Negative supply rail; connects to system ground or negative rail; thermal pad (SOIC-D) not present |
| 5 | –In B | Inverting input for channel B; electrically isolated from channel A to prevent crosstalk in dual-sensor systems |
| 6 | +In B | Noninverting input for channel B; matched layout symmetry with +In A minimizes thermal gradient errors |
| 7 | Out B | Amplifier B output; independently stable under capacitive loads up to 1500 pF without oscillation |
| 8 | V+ | Positive supply rail; accepts up to ±18 V; internal protection prevents latch-up during supply sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low drift architecture | Laser-trimmed input stage achieves ±0.1 µV/°C max drift - eliminates recalibration cycles in field-deployed instrumentation |
| Independent dual channels | No shared circuitry between amplifiers; channel separation >120 dB prevents interference in dual-transducer interfaces |
| Input protection network | 1-kΩ series resistors + diode clamps enable ±30-V differential input tolerance without damage or parameter shift |
| Bias current cancellation | Internal cancellation reduces net input bias current to ±1 nA max - removes need for external IB-compensation resistors |
| Unity-gain stable design | Stable at G = 1 with no external compensation; supports buffer configurations directly on high-impedance sensor nodes |
Applications
| Weigh Scale Front-End | Temperature Transmitter |
|---|---|
|
Use Scenario: Amplifies mV-level output from strain gauge bridge under varying ambient temperatures and mechanical vibration. IC Role / Device Role / Timing Role: Dual-channel precision instrumentation amplifier core - one channel for bridge excitation monitoring, one for differential sensor output. Use Value: ±0.1 µV/°C drift ensures <0.005% full-scale error over –10°C to +60°C operating range without recalibration. |
Use Scenario: Conditions RTD or thermocouple signals in 4–20 mA loop-powered transmitters with strict power budget constraints. IC Role / Device Role / Timing Role: Dual op amp performs cold-junction compensation and linearization amplification in single SOIC footprint. Use Value: 800 µA per amplifier enables full dual-channel signal chain within 1.6 mA total quiescent current - meets loop-power limits. |
| Pressure Transmitter Signal Chain | Data Acquisition System Input Stage |
|
Use Scenario: Interfaces piezoresistive pressure sensors requiring high CMRR to reject common-mode noise from pump motors and solenoids. IC Role / Device Role / Timing Role: First-stage differential amplifier with 140 dB CMRR rejecting 60 Hz line noise and motor drive harmonics. Use Value: 140 dB CMRR suppresses >100 V common-mode interference to <1 µV error - exceeds IEC 61000-4-6 immunity requirements. |
Use Scenario: Serves as programmable-gain amplifier (PGA) front-end in 16-bit SAR ADC systems handling multiple sensor types. IC Role / Device Role / Timing Role: Dual op amp configured as gain stage and reference buffer; both channels referenced to same precision voltage source. Use Value: ±10 µV offset enables <0.0015% gain error at 1 V output - preserves effective resolution of 16-bit conversion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2182IDR | Lower 0.02 µV/°C drift but higher 1.3 mA quiescent current; includes integrated zero-drift auto-zero architecture | Better for ultra-stable lab equipment; less suitable for battery-powered field devices due to current draw | Select OPA2182IDR when long-term drift dominates error budget and power is not constrained |
| AD8628ARZ-REEL7 | Zero-drift chopper architecture; 1 µV offset but higher 1.1 µVPP 0.1–10 Hz noise vs. OPA227UA/2K5G4's 0.22 µVPP | Preferred for microvolt-level DC measurements; less optimal for low-noise analog input modules with wideband sensors | Select AD8628ARZ-REEL7 when offset nulling is mandatory and 0.1–10 Hz noise is secondary to drift |
Compared with OPA227UA/2K5G4, OPA2182IDR trades lower drift for 60% higher supply current, while AD8628ARZ-REEL7 offers near-zero offset at the cost of elevated low-frequency noise - making OPA227UA/2K5G4 the balanced choice for industrial DAQ requiring simultaneous low drift, low noise, and moderate power.
Availability
OPA227UA/2K5G4 is available at Aetrix Electronics and suitable for weigh scale front-ends, temperature transmitters, and pressure transmitter signal chains requiring stable component supply across extended production lifecycles.
Supply support for OPA227UA/2K5G4 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.
The OPAx277 product line was engineered specifically for high-accuracy industrial measurement systems demanding ultra-low drift, robust EMI immunity, and seamless replacement of legacy OP-177-based designs.
FAQ
What is the maximum supply voltage for OPA227UA/2K5G4?
The OPA227UA/2K5G4 supports dual supplies from ±2 V to ±18 V, corresponding to a total supply range of 4 V to 36 V. Absolute maximum rating is 36 V across V+ and V– pins. Operation beyond ±18 V risks permanent damage and violates the device's specified performance envelope.
Does OPA227UA/2K5G4 require external offset trim?
No - the OPA227UA/2K5G4 does not provide external offset trim pins. Only the single-channel OPA277 (not OPA2277) includes trim pins (1 and 8). The OPA227UA/2K5G4 uses laser trimming to achieve ±10 µV max offset at 25°C, eliminating need for user adjustment in most precision applications.
Can OPA227UA/2K5G4 drive capacitive loads?
Yes - the OPA227UA/2K5G4 is unity-gain stable and can safely drive capacitive loads up to 1500 pF without oscillation, as verified in TI's typical characteristics (Figure 6-19). For loads >1000 pF, consider adding a small series resistor (e.g., 10–50 Ω) at the output to isolate capacitance from the amplifier's feedback node.
What is the input protection capability of OPA227UA/2K5G4?
The OPA227UA/2K5G4 includes internal 1-kΩ series input resistors and diode clamps on both inputs, enabling survival of ±30 V differential input voltage without damage. This protects against transient overvoltage events in industrial sensor interfaces, though sustained overvoltage may affect accuracy until recovery.
How does OPA227UA/2K5G4 handle thermal gradients between inputs?
The OPA227UA/2K5G4 is sensitive to thermoelectric potentials generated by dissimilar metal junctions at its inputs. To preserve ultra-low drift, layout must ensure equal thermal mass on +In A/B and –In A/B traces, isolate heat sources, and shield inputs from airflow - practices documented in Section 7.3.1 of the TI datasheet SBOS079C.
OPA227UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA227UA/2K5G4 FAQ
1.How can I place an order for OPA227UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA227UA/2K5G4 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 OPA227UA/2K5G4 reliable?
The price and inventory of OPA227UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA227UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA227UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA227UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA227UA/2K5G4?
OPA227UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA227UA/2K5G4 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 OPA227UA/2K5G4?
For technical support, including OPA227UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA227UA/2K5G4 requirements.
6.How does Aetrix verify that OPA227UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA227UA/2K5G4 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 OPA227UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA227UA/2K5G4?
All OPA227UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA227UA/2K5G4, 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 OPA227UA/2K5G4 part is unused and in its original packaging.
Return procedure for OPA227UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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