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Texas Instruments OPA4131PAG4
- Part No.:
- OPA4131PAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA4131PAG4.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,939
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Product details
Overview
OPA4131PAG4 from Texas Instruments is a quad-channel, FET-input operational amplifier optimized for precision analog signal conditioning in multi-channel instrumentation systems. It delivers 4 MHz gain bandwidth, 10 V/μs slew rate, ±4.5V to ±18V dual-supply operation, and ≤750 μV input offset voltage - enabling high-fidelity amplification in ECG front-ends and flow transmitter sensor interfaces.
For engineers reviewing the OPA4131PAG4 datasheet, OPA4131PAG4 pinout, OPA4131PAG4 application, or OPA4131PAG4 equivalent, this page provides verified package mapping (14-pin PDIP), channel-isolated quad topology, FET-input bias current ≤50 pA, rail-to-rail output swing capability, and confirmed compatibility with capacitive load drive up to 300 pF without instability.
Technical Context
The OPA4131PAG4 implements fully independent amplifier channels in a single 14-pin PDIP package, eliminating crosstalk between channels - critical for simultaneous multi-sensor acquisition. Its FET-input architecture ensures ultra-low input bias current (≤50 pA max) and high input impedance (10¹² Ω || 4.3 pF), preserving signal integrity in high-impedance source applications like pH probes and piezoelectric sensors.
It features unity-gain stability, no phase reversal under common-mode overvoltage, and robust capacitive load drive (tested to 300 pF), making it suitable for active filter stages and transimpedance configurations without external compensation. The device operates across –40°C to +85°C ambient temperature with ±1.5 mA quiescent current per amplifier.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Quad - four electrically isolated amplifiers in one package, enabling compact multi-channel signal conditioning without inter-channel coupling. |
| Input Bias Current | ≤50 pA max - preserves accuracy in high-impedance sensor interfaces (e.g., electrochemical cells, photodiode TIA inputs). |
| Input Offset Voltage | ≤750 μV max - reduces DC error in precision DC-coupled amplification stages without trimming. |
| Gain Bandwidth Product | 4 MHz - supports stable closed-loop operation up to ~300 kHz at G = 10, suitable for anti-aliasing and sensor signal bandwidths. |
| Slew Rate | 10 V/μs - enables faithful reproduction of fast transient signals (e.g., ECG QRS complexes, pulse oximetry waveforms). |
| Supply Voltage Range | ±4.5 V to ±18 V - accommodates industrial ±5 V, ±12 V, and ±15 V rails without external regulation. |
| Common-Mode Input Range | (V–) + 3 V to (V+) – 3.5 V - allows operation with inputs near supply rails in single-supply derived mid-rail configurations. |
Pinout & Package
OPA4131PAG4 is housed in a 14-pin plastic dual in-line package (PDIP, N package), through-hole mountable, RoHS-compliant, with lead finish NiPdAu and no moisture sensitivity level (MSL) restriction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Input | Noninverting input for amplifier channel A - connects to high-impedance signal sources without loading. |
| –IN A (Pin 2) | Input | Inverting input for amplifier channel A - used for inverting gain stages or feedback networks. |
| OUT A (Pin 1) | Output | Amplified output of channel A - drives loads ≥2 kΩ with ±12.5 V swing (±15 V supply). |
| +IN B (Pin 5) | Input | Noninverting input for channel B - electrically isolated from other channels for parallel signal paths. |
| –IN B (Pin 6) | Input | Inverting input for channel B - supports independent gain configuration per channel. |
| OUT B (Pin 7) | Output | Amplified output of channel B - same performance specs as OUT A; no crosstalk observed. |
| +IN C (Pin 10) | Input | Noninverting input for channel C - enables three-channel simultaneous acquisition in compact layout. |
| –IN C (Pin 9) | Input | Inverting input for channel C - maintains full independence from channels A and B. |
| OUT C (Pin 8) | Output | Amplified output of channel C - verified stable into 300 pF capacitive load per channel. |
| +IN D (Pin 12) | Input | Noninverting input for channel D - completes quad functionality for 4-sensor or 4-stage signal chains. |
| –IN D (Pin 13) | Input | Inverting input for channel D - supports individual feedback network design per channel. |
| OUT D (Pin 14) | Output | Amplified output of channel D - identical electrical behavior to other outputs; no shared internal nodes. |
| V+ (Pin 4) | Power | Positive supply rail connection - must be bypassed with ≥10 nF ceramic capacitor to ground. |
| V– (Pin 11) | Power | Negative supply rail connection - requires separate bypassing; not internally tied to other channels. |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | Enables ≤50 pA input bias current and 10¹² Ω input resistance - essential for microamp-level sensor current measurement. |
| No phase reversal on overvoltage | Prevents catastrophic output inversion when input exceeds common-mode range - eliminates latch-up risk in voltage-follower sensor buffers. |
| Unity-gain stable | Operates reliably at G = 1 without external compensation - simplifies design of precision buffers and active filters. |
| Capacitive load drive | Stable with ≥300 pF load - supports direct driving of ADC input capacitance or long PCB traces without ringing. |
| Laser-trimmed offset | Guarantees ≤750 μV max input offset voltage - reduces need for external nulling circuits in production systems. |
Applications
| ECG Front-End Amplifier | Multi-Sensor Flow Transmitter |
|---|---|
Use Scenario: Amplifying low-amplitude, high-impedance biopotential signals from Ag/AgCl electrodes with minimal noise and DC drift. IC Role / Device Role / Timing Role: Quad-channel instrumentation amplifier core - each channel conditions one limb lead or chest vector independently. Use Value: ≤50 pA input bias current prevents electrode polarization; ≤750 μV offset minimizes baseline wander; 4 MHz bandwidth captures full ECG spectral content (0.05–150 Hz). |
Use Scenario: Simultaneous conditioning of differential pressure, temperature, and flow sensor outputs in industrial metering modules. IC Role / Device Role / Timing Role: Multi-channel signal conditioner - each amplifier handles one sensor's analog output before multiplexed ADC sampling. Use Value: Channel isolation prevents cross-talk between pressure and temperature channels; ±18 V supply range supports 4–20 mA loop-powered sensor interfaces. |
| Data Acquisition System (DAQ) | Lab Instrumentation Signal Chain |
Use Scenario: High-resolution, multi-channel analog input module for benchtop DAQ systems requiring low noise and DC accuracy. IC Role / Device Role / Timing Role: Preconditioning amplifier array - performs gain, filtering, and level-shifting prior to SAR ADC sampling. Use Value: 10 V/μs slew rate supports 100 kSPS sampling with <0.1% settling; 10¹² Ω input impedance avoids loading of passive RC filters. |
Use Scenario: Modular test equipment (e.g., oscilloscope front-end, spectrum analyzer IF stage) requiring flexible, low-drift amplification. IC Role / Device Role / Timing Role: General-purpose op amp resource - configured as buffer, integrator, or active filter across multiple instrument subsystems. Use Value: 4 MHz GBW enables stable 2nd-order low-pass filters at 100 kHz; laser-trimmed offset ensures calibration stability over time and temperature. |
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 |
|---|---|---|---|
| OPA4131UA | 16-pin SOIC (DW) package; same electrical specs but surface-mount; RθJA = 110°C/W vs 80°C/W for PDIP. | Better thermal performance in high-density layouts; requires reflow assembly instead of through-hole. | Select OPA4131UA for automated SMT production; OPA4131PAG4 remains optimal for prototyping, repair, or legacy through-hole designs. |
| TL074CDR | Higher input offset (±6 mV), higher bias current (±200 pA), lower GBW (3 MHz); JFET input but not laser-trimmed. | Cost-sensitive general-purpose use where precision is secondary; unsuitable for ECG or low-level sensor apps. | Choose TL074CDR only for non-critical AC-coupled applications; OPA4131PAG4 is required where sub-mV offset and pA bias matter. |
Compared with OPA4131UA and TL074CDR, the OPA4131PAG4 uniquely combines PDIP manufacturability, laser-trimmed precision, and guaranteed ≤50 pA bias - making it the only choice for through-hole-based medical or metrology systems demanding traceable DC accuracy.
Availability
OPA4131PAG4 is available at Aetrix Electronics and suitable for ECG front-ends, industrial flow transmitters, multi-channel data acquisition systems, and lab-grade instrumentation requiring stable component supply across extended product lifecycles.
Supply support for OPA4131PAG4 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 excellence.
The OPAx131 product line was engineered specifically for cost-sensitive, high-performance analog signal conditioning - delivering FET-input precision in industry-standard packages for instrumentation, medical, and industrial sensing applications.
FAQ
What is the maximum operating temperature range for the OPA4131PAG4?
The OPA4131PAG4 is rated for operation from –40°C to +85°C ambient temperature. This range is validated per TI's Recommended Operating Conditions and applies to all electrical specifications in the datasheet. Thermal derating is not required within this span, and the device maintains full performance including ≤750 μV offset voltage and ≤50 pA input bias current across the entire range. The PDIP package's 80°C/W junction-to-ambient thermal resistance supports reliable operation at full load under natural convection.
Does the OPA4131PAG4 require external compensation for unity-gain stability?
No, the OPA4131PAG4 is internally compensated for unity-gain stability. It can be configured as a voltage follower (G = 1) without external components and remains stable into capacitive loads up to 300 pF - verified in Figure 5-12 and 5-13 of the SBOS040B datasheet. This eliminates the need for compensation networks in buffer or active filter applications, reducing bill-of-materials count and layout complexity.
How does the OPA4131PAG4 handle input common-mode voltage violations?
The OPA4131PAG4 does not exhibit output phase reversal when the input common-mode voltage exceeds its specified range (V– + 3 V to V+ – 3.5 V). Unlike many FET-input op amps, its input stage is designed to maintain correct polarity even during overvoltage events - a critical feature for sensor buffers in unpredictable field environments. This behavior is explicitly confirmed in Section 6.1 of the datasheet and eliminates risk of control-loop instability in voltage-follower configurations.
Can the OPA4131PAG4 drive ADC input capacitance directly?
Yes, the OPA4131PAG4 is characterized for stable operation with ≥300 pF capacitive loads, which exceeds typical SAR and delta-sigma ADC input capacitances (usually 10–50 pF). Its robust capacitive load drive - demonstrated in Figure 5-15 - ensures monotonic settling and absence of ringing when driving ADC sample-and-hold circuits, eliminating the need for series isolation resistors in most designs.
What is the quiescent current per amplifier in the OPA4131PAG4?
The OPA4131PAG4 draws ±1.5 mA to ±2.0 mA quiescent current per amplifier, depending on grade (U vs UA) and supply voltage. At ±15 V, typical IQ is ±1.75 mA per channel, resulting in ~14 mA total for all four amplifiers. This value is specified in Section 5.6 Electrical Characteristics and remains stable across temperature - enabling predictable power budgeting in battery- or energy-constrained instrumentation systems.
OPA4131PAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 14-PDIP
OPA4131PAG4 FAQ
1.How can I place an order for OPA4131PAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4131PAG4 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 OPA4131PAG4 reliable?
The price and inventory of OPA4131PAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4131PAG4 is usually 5 days.
3.What payment methods are accepted for OPA4131PAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4131PAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4131PAG4?
OPA4131PAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4131PAG4 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 OPA4131PAG4?
For technical support, including OPA4131PAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4131PAG4 requirements.
6.How does Aetrix verify that OPA4131PAG4 is sourced from the original manufacturer or authorized distributors?
All OPA4131PAG4 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 OPA4131PAG4 meets industry standards.
7.What is the process for return or replacement of OPA4131PAG4?
All OPA4131PAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4131PAG4, 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 OPA4131PAG4 part is unused and in its original packaging.
Return procedure for OPA4131PAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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