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Texas Instruments OPA4131UA
- Part No.:
- OPA4131UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
OPA4131UA.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:164
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Product details
Overview
OPA4131UA from Texas Instruments is a quad-channel, FET-input operational amplifier designed for precision analog signal conditioning in multi-channel instrumentation systems. It delivers 4MHz gain-bandwidth, 10V/μs slew rate, ±4.5V to ±18V dual-supply operation, and ≤1mV input offset voltage - enabling high-fidelity amplification in ECG front-ends and data acquisition channels.
For engineers reviewing the OPA4131UA datasheet, OPA4131UA pinout, OPA4131UA application, or OPA4131UA equivalent, key selection criteria include its 16-pin SOIC (DW) package, quad independent amplifier topology, FET-input bias current ≤50pA, rail-to-rail output swing capability, and compatibility with capacitive loads up to 300pF without external compensation.
Technical Context
The OPA4131UA implements a fully differential, unity-gain stable architecture with laser-trimmed input offset and no phase reversal under common-mode overvoltage conditions. Its four independent amplifiers share only power rails - ensuring channel isolation critical for multi-sensor signal chains.
Designed for low-noise, low-drift DC-coupled applications, it features 15nV/√Hz input voltage noise at 1kHz, 3fA/√Hz input current noise, and 70–80dB CMRR across –12V to +11.5V common-mode range - supporting accurate measurement of microvolt-level biopotentials and sensor outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Quad - enables four independent signal paths on single IC, reducing board area vs discrete op-amps. |
| Gain Bandwidth | 4MHz - supports stable closed-loop operation up to 100kHz at G=40, suitable for anti-aliasing filters. |
| Slew Rate | 10V/μs - ensures <2μs settling to 0.01% for 10V step, critical for fast transient response in DAQ systems. |
| Input Offset Voltage | ±1mV max - minimizes DC error in precision transducer interfaces without external trimming. |
| Input Bias Current | ±50pA max - preserves signal integrity in high-impedance pH, photodiode, or piezoelectric sensor circuits. |
| Supply Range | ±4.5V to ±18V - accommodates industrial ±15V rails and portable ±5V systems without level-shifting. |
| Common-Mode Range | (V–)+3V to (V+)-3.5V - allows direct interfacing with sensors operating near supply rails. |
Pinout & Package
OPA4131UA is packaged in a 16-pin SOIC (DW) surface-mount package with exposed pad thermal enhancement. Pin 1 orientation follows quadrant Q1 tape configuration per TI packaging specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load; capable of ±2.5V swing into 2kΩ with ±15V supplies. |
| 2 | –IN A | Inverting input, channel A - forms feedback node in inverting configurations; high-impedance FET input. |
| 3 | +IN A | Noninverting input, channel A - accepts high-Z sensor signals; common-mode range extends within 3V of rails. |
| 4 | V+ | Positive supply - must be bypassed with ≥10nF ceramic capacitor to ground for stability. |
| 5 | +IN B | Noninverting input, channel B - electrically isolated from other channels; identical specs to channel A. |
| 6 | –IN B | Inverting input, channel B - independent input path; no crosstalk with channels A/C/D per datasheet. |
| 7 | OUT B | Amplifier B output - fully buffered; supports capacitive loads up to 300pF without oscillation. |
| 8 | NC | No internal connection - must be left floating; not tied to substrate or power. |
| 9 | –IN C | Inverting input, channel C - shares same FET-input structure and bias current spec as all channels. |
| 10 | +IN C | Noninverting input, channel C - supports same common-mode and noise performance as other inputs. |
| 11 | OUT C | Amplifier C output - rated for ±20mA short-circuit current; thermally protected per absolute max ratings. |
| 12 | +IN D | Noninverting input, channel D - completes quad set; all four inputs exhibit matched offset drift ≤10μV/°C. |
| 13 | –IN D | Inverting input, channel D - independent control path; validated for simultaneous overdrive without affecting others. |
| 14 | OUT D | Amplifier D output - identical AC/DC specs to OUT A/B/C; enables synchronized multi-channel filtering. |
| 15 | V– | Negative supply - referenced for all internal biasing; requires local decoupling for low-noise operation. |
| 16 | NC | No internal connection - must remain unconnected; floating state verified in TI mechanical drawings. |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | ≤50pA max input bias current enables use with >100MΩ source impedances without significant error. |
| Laser-trimmed offset | ±1mV max VOS and ±10μV/°C drift ensure stable DC accuracy across –40°C to +85°C ambient. |
| Capacitive load drive | Stable with up to 300pF load without external compensation - simplifies filter design in sensor interfaces. |
| No phase reversal | Eliminates output polarity inversion during common-mode overvoltage - prevents latch-up in ECG monitors. |
| Channel independence | All four amplifiers operate autonomously; overdrive or short-circuit on one channel does not affect others. |
Applications
| ECG Signal Conditioning | Data Acquisition Front-End |
|---|---|
|
Use Scenario: Amplifying microvolt-level cardiac signals from electrode pairs while rejecting 50/60Hz mains interference. IC Role / Device Role / Timing Role: Quad OPA4131UA provides simultaneous instrumentation amp gain stages, right-leg drive buffer, and anti-aliasing filter sections. Use Value: FET input preserves signal integrity from high-impedance dry electrodes; 15nV/√Hz noise floor maintains diagnostic SNR above 70dB. |
Use Scenario: Simultaneous sampling of four analog sensor outputs (e.g., temperature, pressure, humidity, flow) in industrial PLC modules. IC Role / Device Role / Timing Role: Each amplifier conditions one sensor signal prior to multiplexing and ADC conversion. Use Value: Matched offset and drift across channels reduce calibration burden; 4MHz GBW supports 100ksps sampling with adequate settling. |
| Lab Instrumentation | Flow Transmitter Interface |
|
Use Scenario: Precision voltage-controlled current sources and programmable gain stages in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: OPA4131UA serves as I/V converter, reference buffer, and active filter in multi-function test equipment. Use Value: ±18V supply range supports full-scale 20V output ranges; 80dB PSRR rejects power supply ripple in sensitive measurement paths. |
Use Scenario: Converting 4–20mA loop current to voltage and amplifying turbine flow meter pulse outputs in process control systems. IC Role / Device Role / Timing Role: One channel buffers loop-powered sensor supply; others condition frequency and analog outputs. Use Value: Rail-compatible inputs accept sensor outputs near V–; 10V/μs slew rate preserves fast flow pulse edges for accurate frequency counting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad FET-input operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4132UA | Lower input voltage noise (12nV/√Hz), higher quiescent current (2.2mA/channel), same 4MHz GBW and 16-pin SOIC package. | Better suited for ultra-low-noise audio preamps; less optimal for battery-powered DAQ due to higher IQ. | Select OPA4132UA when noise dominates system budget and power is not constrained. |
| TL074CDR | JFET input but higher VOS (10mV max), lower GBW (3MHz), no laser trimming, 14-pin SOIC package with different pinout. | Cost-sensitive general-purpose use; unsuitable for precision ECG or calibrated sensor interfaces. | Choose TL074CDR only for non-critical AC-coupled applications where offset and drift are tolerable. |
Compared with OPA4131UA, OPA4132UA offers superior noise performance at higher power cost, while TL074CDR provides basic JFET functionality at lower cost but with significantly degraded DC accuracy and bandwidth - making OPA4131UA the balanced choice for precision multi-channel analog front-ends.
Availability
OPA4131UA is available at Aetrix Electronics and suitable for electrocardiogram (ECG) monitors, industrial data acquisition systems, and laboratory instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for OPA4131UA 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 op-amp design and manufacturing.
The OPAx131 product line was engineered for cost-effective, high-performance general-purpose amplification in instrumentation, medical, and industrial systems - emphasizing low offset, wide supply range, and robust capacitive load drive.
FAQ
What is the maximum capacitive load the OPA4131UA can drive without instability?
The OPA4131UA is characterized for stable operation with up to 300pF capacitive load at unity gain, as confirmed in Figure 5-15 of the SBOS040B datasheet. This eliminates need for external isolation resistors in many sensor interface and filter applications, though layout-dependent parasitics should still be minimized.
Does the OPA4131UA require external offset nulling circuitry?
No, the OPA4131UA uses laser trimming to achieve ±1mV max input offset voltage and ±10μV/°C drift, eliminating need for external nulling components in most precision applications. Section 6.1.1 of the datasheet confirms typical offset remains below ±0.75mV at 25°C without user adjustment.
What is the operating temperature range for the OPA4131UA part number specifically?
The OPA4131UA is rated for –40°C to +85°C ambient operating temperature, as specified in the PACKAGE OPTION ADDENDUM for orderable part OPA4131UA/1K.A. This differs from the wider –55°C to +125°C range offered by the OPA4131UJ variant.
How does the OPA4131UA prevent output phase reversal during common-mode overvoltage?
The OPA4131UA incorporates internal circuitry that avoids the phase-reversal behavior common in older FET-input op-amps. As stated in Section 6.1, it maintains correct polarity even when input common-mode voltage exceeds (V–)+3V or (V+)-3.5V - a critical reliability feature in ECG and sensor front-ends.
Is the OPA4131UA pin-compatible with other quad op-amps like the LM324 or TL074?
No, the OPA4131UA uses a 16-pin SOIC (DW) package with unique pinout defined in Table 4-4, differing from the 14-pin SOIC of LM324/TL074. Direct replacement would require PCB redesign; its closest functional equivalents are OPA4132UA (same footprint) or OPA4131NA (14-pin SOIC, different pin mapping).
OPA4131UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- 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 (x4 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:
- 16-SOIC
OPA4131UA FAQ
1.How can I place an order for OPA4131UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4131UA 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 OPA4131UA reliable?
The price and inventory of OPA4131UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4131UA is usually 5 days.
3.What payment methods are accepted for OPA4131UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4131UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4131UA?
OPA4131UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4131UA 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 OPA4131UA?
For technical support, including OPA4131UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4131UA requirements.
6.How does Aetrix verify that OPA4131UA is sourced from the original manufacturer or authorized distributors?
All OPA4131UA 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 OPA4131UA meets industry standards.
7.What is the process for return or replacement of OPA4131UA?
All OPA4131UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA4131UA, 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 OPA4131UA part is unused and in its original packaging.
Return procedure for OPA4131UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA4131UA Tags
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LM358DT
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LM358DR
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LM2904DR
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LM358ADR
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