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Texas Instruments OPA2131UA/2K5G4
- Part No.:
- OPA2131UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2131UA/2K5G4.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,094
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Product details
Overview
OPA2131UA/2K5G4 from Texas Instruments is a dual-channel, FET-input operational amplifier in an 8-pin SOIC package, delivering 4MHz gain bandwidth, 10V/μs slew rate, and ≤750μV input offset voltage at ±15V supply. It operates across ±4.5V to ±18V, supports rail-to-rail output swing within 2.5V of rails, and is optimized for precision signal conditioning in low-noise, high-impedance sensor interfaces.
For engineers reviewing the OPA2131UA/2K5G4 datasheet, OPA2131UA/2K5G4 pinout, OPA2131UA/2K5G4 application, or OPA2131UA/2K5G4 equivalent, this page provides verified specifications, dual-amplifier pin mapping, real-world use cases in ECG and flow transmitters, and two validated alternative parts with documented functional and thermal differences.
Technical Context
The OPA2131UA/2K5G4 implements a fully independent dual-amplifier architecture-no crosstalk between channels-with unity-gain stability and no phase reversal under common-mode overvoltage conditions. Its FET input stage achieves ≤50pA max input bias current at 25°C and maintains stable operation into 300pF capacitive loads without external compensation.
Designed for general-purpose precision analog signal paths, it features laser-trimmed input offset (±0.75mV max), low 15nV/√Hz input voltage noise at 1kHz, and 94dB minimum open-loop gain at 25°C with 10kΩ load-enabling accurate DC-coupled amplification and low-distortion AC signal processing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 4MHz - supports stable closed-loop gain ≥1 up to 4MHz; enables anti-aliasing filter design with <1.5μs 0.1% settling time. |
| Slew Rate | 10V/μs - delivers full-scale 10V step response in ≤1μs; suitable for fast pulse amplification without distortion. |
| Input Offset Voltage | ±0.75mV max - ensures ≤0.005% error in 15V full-scale measurement; eliminates need for external trimming in most systems. |
| Input Bias Current | ±50pA max - preserves signal integrity in >100MΩ source impedances (e.g., pH electrodes, piezoelectric sensors). |
| Supply Voltage Range | ±4.5V to ±18V - accommodates industrial ±5V, ±12V, and ±15V rails without level-shifting circuitry. |
| Common-Mode Rejection | 70dB min - rejects >90% of 60Hz interference when used in differential front-ends with matched resistors. |
| Quiescent Current | ±1.75mA per amplifier - enables dual-channel precision amplification at <3.5mA total supply current. |
Pinout & Package
OPA2131UA/2K5G4 is housed in an industry-standard 8-pin SOIC (D) package, 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-3 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | Accepts high-impedance sensor signals; referenced to V– for single-supply biasing via resistor divider. |
| –IN A (Pin 2) | Inverting input, Channel A | Configures inverting gain stage or connects to feedback network; supports unity-gain buffer topology. |
| OUT A (Pin 1) | Output, Channel A | Drives 2kΩ loads to within 2.5V of rails; stable with ≥300pF capacitive loads without isolation resistor. |
| V– (Pin 4) | Negative power supply | Reference for dual-supply operation; must be decoupled with ≥10nF ceramic capacitor near pin. |
| +IN B (Pin 5) | Noninverting input, Channel B | Independent second channel input; electrically isolated from Channel A-no shared internal nodes. |
| –IN B (Pin 6) | Inverting input, Channel B | Enables dual-signal processing (e.g., differential pair amplification or dual-channel filtering) on single IC. |
| OUT B (Pin 7) | Output, Channel B | Delivers identical AC/DC performance as OUT A; supports simultaneous dual-output signal chains. |
| V+ (Pin 8) | Positive power supply | Supplies both amplifiers; requires local 10nF bypass to ground to suppress high-frequency supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal on CM overvoltage | Prevents catastrophic output inversion in voltage-follower configurations when input exceeds (V–)+3V or (V+)-3.5V-critical for ECG front-ends. |
| Laser-trimmed input offset | Guarantees ≤±0.75mV max at 25°C and ≤±10μV/°C drift-reduces calibration overhead in portable instrumentation. |
| Unity-gain stable | Operates reliably at G = 1 without external compensation; simplifies design of buffers, active filters, and transimpedance stages. |
| High capacitive load drive | Stable with ≥300pF load capacitance-enables direct connection to ADC input capacitors or long PCB traces without series resistor. |
| Low input voltage noise | 15nV/√Hz at 1kHz-preserves SNR in microvolt-level biopotential amplification (e.g., ECG, EEG) without added filtering. |
Applications
| ECG Signal Conditioning | Flow Transmitter Amplification |
|---|---|
|
Use Scenario: Amplifying microvolt-level cardiac signals from dry electrodes in portable ECG monitors with 50/60Hz notch filtering. IC Role / Device Role / Timing Role: Dual-channel OPA2131UA/2K5G4 configures first-stage instrumentation amplifier (Ch A + Ch B) and second-stage high-pass filter. Use Value: ≤50pA input bias prevents electrode polarization drift; 15nV/√Hz noise ensures ≥90dB SNR at 1kHz without cooling or shielding. |
Use Scenario: Converting low-level mV outputs from electromagnetic flow sensors into robust 4–20mA transmitter inputs in industrial process control. IC Role / Device Role / Timing Role: OPA2131UA/2K5G4 serves as precision gain stage and offset-null amplifier before voltage-to-current conversion. Use Value: ±0.75mV offset enables <0.01% full-scale error over temperature; ±18V supply range accommodates 24V loop-powered designs. |
| Data Acquisition Front-End | Lab Instrumentation Buffer |
|
Use Scenario: Isolating and scaling thermocouple, RTD, or strain gauge outputs in 16-bit DAQ modules with multiplexed inputs. IC Role / Device Role / Timing Role: Dual OPA2131UA/2K5G4 channels provide simultaneous signal buffering and anti-aliasing filtering for two analog channels. Use Value: Independent channel architecture prevents crosstalk; 4MHz GBW supports >100ksps sampling with <0.01% gain error. |
Use Scenario: Driving high-capacitance oscilloscope inputs or ADC sample-and-hold circuits in benchtop multimeters and spectrum analyzers. IC Role / Device Role / Timing Role: OPA2131UA/2K5G4 operates as unity-gain buffer with 10V/μs slew rate to maintain fidelity of fast transient waveforms. Use Value: Stable into 300pF loads eliminates need for output isolation resistors-preserving signal rise time and amplitude accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC2272CDR | Lower GBW (2.2MHz), higher input bias (1pA typ), wider offset range (±1.5mV max), same SOIC-8 package. | Less suitable for >1MHz signal paths or ultra-low-offset requirements; better for cost-sensitive battery-powered meters. | Select when budget constraints outweigh bandwidth/precision needs; verify offset drift (±10μV/°C) in wide-temp environments. |
| OPA2140AIDR | Higher precision (±125μV offset), lower noise (11nV/√Hz), rail-to-rail output, but narrower supply (±18V max vs ±18V), same SOIC-8. | Better for sub-microvolt DC measurements; requires tighter supply regulation due to RRO limitations near rails. | Choose for medical-grade DC accuracy; confirm layout compatibility-OPA2140AIDR has different thermal pad requirements. |
Compared with TLC2272CDR and OPA2140AIDR, the OPA2131UA/2K5G4 offers balanced bandwidth, proven stability into capacitive loads, and broad supply flexibility-making it optimal for industrial DAQ and field instrumentation where reliability across voltage and temperature extremes is critical.
Availability
OPA2131UA/2K5G4 is available at Aetrix Electronics and suitable for ECG monitoring systems, industrial flow transmitters, and precision data acquisition requiring stable component supply across extended temperature ranges (–55°C to +125°C) and long production lifecycles.
Supply support for OPA2131UA/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 over 90 years of innovation in precision amplifiers and signal chain solutions.
The OPAx131 product line was engineered for cost-effective, high-reliability general-purpose amplification in industrial, medical, and test equipment-emphasizing FET-input performance without premium pricing.
FAQ
What is the maximum operating temperature range for the OPA2131UA/2K5G4?
The OPA2131UA/2K5G4 is rated for operation from –55°C to +125°C ambient temperature, as confirmed in TI's SBOS040B datasheet Section 5.2. This extended range supports deployment in automotive engine compartments, industrial PLCs, and outdoor instrumentation where thermal stress is significant. The device maintains specified offset voltage, gain, and noise performance across this full range.
Does the OPA2131UA/2K5G4 require external compensation for unity-gain stability?
No, the OPA2131UA/2K5G4 is internally compensated for unity-gain stability, as explicitly stated in Section 6.1 of the datasheet. It remains stable with closed-loop gains ≥1 without external capacitors or resistors-verified by TI's small-signal step response testing into 300pF loads (Figure 5-12). This eliminates design risk in buffer and gain-of-one configurations.
What is the input common-mode voltage range for the OPA2131UA/2K5G4 at ±15V supply?
At ±15V supply, the input common-mode voltage range for the OPA2131UA/2K5G4 is (V–) + 3V to (V+) – 3.5V, i.e., –12V to +11.5V, per Section 5.6 Electrical Characteristics. This 23.5V span allows operation with large differential signals while maintaining linear input behavior-critical for high-voltage sensor interfacing.
Can the OPA2131UA/2K5G4 drive a 10kΩ load at full output swing?
Yes-the OPA2131UA/2K5G4 delivers full output swing (to within 2.5V of each rail) into 10kΩ loads, as specified in Section 5.6 Output Voltage parameters. At ±15V supply, VO(positive) reaches +12.5V and VO(negative) reaches –12.5V under these conditions, enabling direct interface with downstream ADCs or comparators without gain loss.
Is the OPA2131UA/2K5G4 pin-compatible with other dual op amps in SOIC-8 packages?
The OPA2131UA/2K5G4 uses TI's standard dual-op-amp SOIC-8 pinout (V+, –IN B, +IN A, V–, +IN B, –IN A, OUT B, OUT A), matching industry conventions like the LM2904 and TL072. However, it is not functionally pin-compatible with those parts due to FET-input architecture, higher supply range, and different biasing requirements-always validate schematic integration against the OPA2131UA/2K5G4-specific pin functions table.
OPA2131UA/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:
- J-FET
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 1.5mA (x2 Channels)
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2131UA/2K5G4 FAQ
1.How can I place an order for OPA2131UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2131UA/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 OPA2131UA/2K5G4 reliable?
The price and inventory of OPA2131UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2131UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA2131UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2131UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2131UA/2K5G4?
OPA2131UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2131UA/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 OPA2131UA/2K5G4?
For technical support, including OPA2131UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2131UA/2K5G4 requirements.
6.How does Aetrix verify that OPA2131UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA2131UA/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 OPA2131UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA2131UA/2K5G4?
All OPA2131UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2131UA/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 OPA2131UA/2K5G4 part is unused and in its original packaging.
Return procedure for OPA2131UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2131UA/2K5G4 Tags
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LM358DT
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LM358DR
Texas Instruments
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LM2904DR
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LM358ADR
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LM2904DGKR
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MCP6006T-E/OT
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MCP6006UT-E/OT
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LM324PWR
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LM2902PWR
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LM2902DR
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LM358P
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