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Texas Instruments OPA4131NAG4
- Part No.:
- OPA4131NAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4131NAG4.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,469
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Product details
Overview
OPA4131NAG4 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 data acquisition channels.
For engineers reviewing the OPA4131NAG4 datasheet, OPA4131NAG4 pinout, OPA4131NAG4 application, or OPA4131NAG4 equivalent, key selection criteria include its quad-channel SOIC-14 package, FET-input bias current (≤50 pA), rail-to-rail output swing capability, and compatibility with capacitive loads up to 300 pF without instability.
Technical Context
The OPA4131NAG4 implements a fully independent quad architecture: all four amplifiers operate with no crosstalk, enabling simultaneous signal paths in multi-sensor DAQ systems. Its FET input stage ensures ultra-low input bias current across temperature, while laser-trimmed offset voltage minimizes DC error accumulation in high-gain transimpedance configurations.
Designed for unity-gain stability, the device avoids phase reversal under common-mode overvoltage - a critical reliability feature in field instrumentation where input transients occur. Its thermal design supports junction temperatures up to 125°C, with RθJA = 80°C/W in the PDIP-14 package, making it suitable for industrial ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Quad - enables four independent analog signal paths on one IC, reducing board space vs discrete op-amps. |
| Gain Bandwidth Product | 4 MHz - supports stable closed-loop operation up to 100 kHz at G = 40, sufficient for anti-aliasing and sensor signal conditioning. |
| Slew Rate | 10 V/μs - allows clean amplification of fast transient signals (e.g., pulse oximetry waveforms) without distortion. |
| Input Offset Voltage | Max ±750 μV - ensures ≤0.75 mV DC error at input, critical for low-level biopotential amplification like ECG. |
| Input Bias Current | Max 50 pA - preserves signal integrity in high-impedance sensor interfaces (e.g., pH electrodes, piezoresistive bridges). |
| Supply Voltage Range | ±4.5 V to ±18 V - accommodates legacy industrial rails and battery-powered portable instruments with headroom for signal swing. |
| Common-Mode Input Range | (V–) + 3 V to (V+) – 3.5 V - supports mid-supply referenced inputs in single-supply designs using level-shifting. |
Pinout & Package
OPA4131NAG4 is packaged in a 14-pin PDIP (plastic dual in-line package), through-hole mountable, RoHS-compliant, with lead finish NIPDAU and operating temperature range –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Output of amplifier channel A - drives downstream ADC driver or filter stage. |
| 2 | –IN A | Inverting input of channel A - connects to feedback network in inverting configuration. |
| 3 | +IN A | Noninverting input of channel A - accepts high-impedance sensor signal or reference voltage. |
| 4 | V+ | Positive power supply - must be bypassed with ≥10 nF ceramic capacitor near pin for stability. |
| 5 | +IN B | Noninverting input of channel B - electrically isolated from other channels; used for parallel signal path. |
| 6 | –IN B | Inverting input of channel B - supports independent gain-setting resistor network. |
| 7 | OUT B | Output of channel B - provides second analog output without shared internal nodes. |
| 8 | OUT C | Output of channel C - enables three-channel simultaneous sampling in compact layout. |
| 9 | –IN C | Inverting input of channel C - maintains full independence; no crosstalk with channels A/B/D. |
| 10 | +IN C | Noninverting input of channel C - accepts third sensor input with same FET-input benefits. |
| 11 | V– | Negative power supply - common return for all four amplifiers; requires local decoupling. |
| 12 | +IN D | Noninverting input of channel D - completes quad functionality for four-sensor or multi-range systems. |
| 13 | –IN D | Inverting input of channel D - supports fourth independent feedback loop. |
| 14 | OUT D | Output of channel D - delivers final analog channel with identical AC/DC specs as others. |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | Enables ≤50 pA input bias current - essential for interfacing with megohm-range sensors without loading error. |
| Laser-trimmed offset voltage | Guarantees ≤±750 μV max - eliminates need for external nulling circuitry in production-grade medical devices. |
| Unity-gain stable | Operates reliably at G = 1 without compensation - simplifies design of voltage followers and active filters. |
| No phase reversal | Prevents catastrophic output inversion during input overvoltage - improves robustness in unconditioned field environments. |
| Capacitive load drive | Stable with ≥300 pF load - supports direct connection to long PCB traces or ADC input capacitance without ringing. |
Applications
| ECG Signal Conditioning | Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying microvolt-level cardiac potentials from dry electrodes in portable ECG monitors. IC Role / Device Role / Timing Role: Quad-channel instrumentation amplifier front-end, providing simultaneous differential gain, filtering, and level-shifting for leads I, II, III, and aVR. Use Value: Ultra-low input bias current prevents electrode polarization drift; low offset ensures accurate ST-segment measurement within ±10 μV tolerance. |
Use Scenario: Simultaneous analog signal conditioning for 4-channel industrial sensor array (pressure, temperature, humidity, flow). IC Role / Device Role / Timing Role: Multi-channel signal conditioner converting sensor outputs to 0–5 V ratiometric ranges prior to multiplexed ADC sampling. Use Value: Independent quad architecture eliminates inter-channel crosstalk; wide supply range supports mixed-sensor excitation voltages (5 V, 12 V, 24 V). |
| Lab Instrumentation Amplifier | Flow Transmitter Analog Stage |
Use Scenario: Precision DC-coupled amplification in benchtop multimeters and source-measure units requiring sub-microvolt resolution. IC Role / Device Role / Timing Role: Low-drift, low-noise gain block in auto-zeroing architectures, paired with chopper-stabilized references. Use Value: ≤10 μV/°C offset drift ensures calibration stability over 8-hour lab sessions; 15 nV/√Hz noise floor supports 6½-digit resolution. |
Use Scenario: Converting 4–20 mA loop current to calibrated voltage in smart flow meters with HART communication. IC Role / Device Role / Timing Role: Isolated current-to-voltage converter and linearization amplifier driving 4–20 mA transmitter output stage. Use Value: High CMRR (>70 dB) rejects common-mode noise from motor drives; rail-to-rail output swing maximizes dynamic range into 2.5 V ADC reference. |
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 | Higher bandwidth (8 MHz), lower noise (12 nV/√Hz), but higher quiescent current (2.5 mA/channel vs 1.75 mA). | Better suited for high-speed DAQ requiring >500 kHz signal fidelity; less optimal for battery-powered ECG due to power draw. | Select OPA4132UA when bandwidth and noise dominate over power; retain OPA4131NAG4 for cost-sensitive, low-power, general-purpose use. |
| TL074CDR | Lower cost JFET-input quad op-amp; higher offset (±10 mV), higher bias current (200 pA), no guaranteed phase-reversal immunity. | Acceptable for non-critical audio or control loops; unsuitable for precision biopotential or metrology applications. | Choose TL074CDR only for cost-driven consumer electronics; OPA4131NAG4 remains preferred for medical, industrial, or test equipment. |
Compared with OPA4132UA and TL074CDR, the OPA4131NAG4 uniquely balances precision (sub-mV offset, pA bias), reliability (no phase reversal), and manufacturability (PDIP-14 through-hole for prototyping and repair), making it the optimal choice for certified medical and industrial instrumentation where validation burden matters.
Availability
OPA4131NAG4 is available at Aetrix Electronics and suitable for ECG monitoring systems, industrial data acquisition modules, and laboratory instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for OPA4131NAG4 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-amps and signal chain solutions.
The OPAx131 series was designed specifically for cost-effective, high-performance general-purpose analog signal conditioning - targeting medical, industrial, and test equipment where FET-input precision meets production scalability.
FAQ
What is the maximum operating temperature for the OPA4131NAG4?
The OPA4131NAG4 has a specified operating ambient temperature range of –40°C to +85°C. This rating applies to the PDIP-14 package variant and is validated per TI's recommended operating conditions. Thermal derating is not required within this range, and the device maintains full electrical performance including offset voltage, bandwidth, and slew rate specifications across the entire span.
Does the OPA4131NAG4 require external compensation for unity-gain stability?
No, the OPA4131NAG4 is internally compensated for unity-gain stability. It can be configured as a voltage follower (G = 1) without external components and remains stable with capacitive loads up to 300 pF. This eliminates the need for compensation networks in most sensor interface and buffering applications, simplifying layout and reducing bill-of-materials count.
Can the OPA4131NAG4 be used with single-supply operation?
Yes, the OPA4131NAG4 supports single-supply operation from 9 V to 36 V. Its input common-mode range extends to (V–) + 3 V and (V+) – 3.5 V, allowing use with rail-splitter or reference-based mid-supply biasing. Output swings to within 2.5 V of each rail, enabling effective signal utilization in 12 V or 24 V industrial systems.
What is the purpose of the NC pins on the OPA4131NAG4 PDIP-14 package?
The OPA4131NAG4 in PDIP-14 has no NC (no-connect) pins - all 14 pins are functional: four outputs, eight inputs (four inverting + four noninverting), and two power supplies (V+ and V–). This differs from the SOIC-16 DW variant, which includes two NC pins (pins 8 and 9). The PDIP-14 pinout is fully utilized, maximizing channel density in through-hole designs.
How does the OPA4131NAG4 handle input overvoltage conditions?
The OPA4131NAG4 features diode-clamped inputs that prevent phase reversal when common-mode voltage exceeds the supply rails by more than ±0.5 V. Unlike many FET-input op-amps, it maintains correct polarity and predictable behavior even under overvoltage stress - a key reliability feature for field-deployed instrumentation exposed to ESD or wiring faults.
OPA4131NAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
OPA4131NAG4 FAQ
1.How can I place an order for OPA4131NAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4131NAG4 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 OPA4131NAG4 reliable?
The price and inventory of OPA4131NAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4131NAG4 is usually 5 days.
3.What payment methods are accepted for OPA4131NAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4131NAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4131NAG4?
OPA4131NAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4131NAG4 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 OPA4131NAG4?
For technical support, including OPA4131NAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4131NAG4 requirements.
6.How does Aetrix verify that OPA4131NAG4 is sourced from the original manufacturer or authorized distributors?
All OPA4131NAG4 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 OPA4131NAG4 meets industry standards.
7.What is the process for return or replacement of OPA4131NAG4?
All OPA4131NAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4131NAG4, 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 OPA4131NAG4 part is unused and in its original packaging.
Return procedure for OPA4131NAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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