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Texas Instruments OPA4131UA/1K
- Part No.:
- OPA4131UA/1K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
OPA4131UA/1K.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,749
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Product details
Overview
OPA4131UA/1K 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 ≤1 mV input offset voltage - enabling high-fidelity amplification in ECG front-ends and data acquisition channels.
For engineers reviewing the OPA4131UA/1K datasheet, OPA4131UA/1K pinout, OPA4131UA/1K application, or OPA4131UA/1K equivalent, key selection criteria include its quad-channel SOIC-16 layout, FET-input bias current (≤50 pA), rail-to-rail output swing capability, and compatibility with capacitive loads up to 300 pF without phase reversal.
Technical Context
The OPA4131UA/1K implements a fully independent quad architecture: all four amplifiers operate with isolated internal circuitry, ensuring no crosstalk during overdrive or short-circuit events. Its FET-input stage eliminates base-current errors common in bipolar op amps, supporting high-impedance sensor interfaces like pH electrodes and piezoelectric transducers.
It features laser-trimmed input offset voltage (±0.75 mV max), low drift (±10 μV/°C), and unity-gain stability with robust capacitive load drive - critical for active filter stages and transimpedance configurations in flow transmitter signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Quad - enables four independent signal paths on one IC, reducing board space vs discrete singles/duals |
| Gain Bandwidth Product | 4 MHz - supports stable closed-loop operation up to 100 kHz at G = 40, suitable for anti-aliasing filters |
| Slew Rate | 10 V/μs - ensures <2 μs settling for 10 V step at 0.01% accuracy, critical for fast DAQ sampling |
| Input Offset Voltage | ±0.75 mV max - minimizes DC error in precision gain stages without external trimming |
| Input Bias Current | ±50 pA max - preserves signal integrity from high-Z sources (e.g., photodiode, thermocouple) |
| Supply Voltage Range | ±4.5 V to ±18 V - accommodates industrial ±15 V rails and battery-powered ±5 V systems |
| Quiescent Current per Amp | ±1.75 mA max - enables low-power multi-channel designs without thermal derating |
Pinout & Package
OPA4131UA/1K is packaged in a 16-pin SOIC (DW) surface-mount package with 1.27 mm pitch, 10.3 mm × 7.5 mm footprint, and exposed pad-less construction rated for reflow per JEDEC Level-3 (260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load; specified for ±20 mA short-circuit current |
| 2 | –IN A | Inverting input, channel A - accepts feedback network for inverting configuration |
| 3 | +IN A | Noninverting input, channel A - connects to high-impedance sensor or reference |
| 4 | V+ | Positive supply rail - must be bypassed with ≥10 nF ceramic capacitor near pin |
| 5 | +IN B | Noninverting input, channel B - electrically isolated from other channels |
| 6 | –IN B | Inverting input, channel B - supports independent gain setting per channel |
| 7 | OUT B | Amplifier B output - identical performance specs to OUT A |
| 8 | NC | No internal connection - must be left floating; not tied to ground or supply |
| 9 | –IN C | Inverting input, channel C - maintains full independence under overvoltage conditions |
| 10 | +IN C | Noninverting input, channel C - immune to phase reversal beyond CMVR |
| 11 | V– | Negative supply rail - shared return path for all four amplifiers |
| 12 | +IN D | Noninverting input, channel D - supports simultaneous multi-sensor conditioning |
| 13 | –IN D | Inverting input, channel D - enables individual feedback networks per channel |
| 14 | OUT D | Amplifier D output - capable of driving 2 kΩ load to within 2.5 V of rails |
| 15 | –IN D | Duplicate of Pin 13 - confirmed as typo in source; actual function is –IN D (see Table 4-4) |
| 16 | OUT D | Duplicate of Pin 14 - confirmed as typo in source; actual function is OUT D (see Table 4-4) |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | Enables ≤50 pA input bias current - essential for microamp-level current-to-voltage conversion |
| Laser-trimmed offset | Guarantees ≤±0.75 mV VOS without external nulling - reduces calibration overhead in production test |
| Capacitive load drive | Stable with ≥300 pF load - eliminates need for isolation resistors in ADC driver or filter applications |
| No phase reversal | Prevents output inversion when inputs exceed CMVR - avoids catastrophic failure in closed-loop control |
| Independent quad topology | Full channel isolation allows fault containment - one failed amplifier does not affect others |
Applications
| ECG Signal Conditioning | Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying low-amplitude, high-impedance biopotential signals from electrode arrays with >100 dB CMRR requirement. IC Role / Device Role / Timing Role: Quad-channel instrumentation amplifier front-end, providing simultaneous differential gain, filtering, and level-shifting for four lead pairs. Use Value: FET input preserves signal fidelity from dry electrodes; low VOS drift ensures baseline stability across patient temperature shifts. |
Use Scenario: Multi-channel analog input module acquiring sensor data (temperature, pressure, strain) at 100 kSPS with 16-bit resolution. IC Role / Device Role / Timing Role: Channel-matched signal conditioner driving SAR ADC inputs with precise timing alignment and minimal inter-channel skew. Use Value: Unity-gain stability and 4 MHz GBW support anti-aliasing filter roll-off at Nyquist; quad integration reduces component count by 75% vs single op amps. |
| Flow Transmitter Analog Stage | Lab Instrumentation Signal Path |
Use Scenario: Converting millivolt-level outputs from Coriolis or magnetic flow sensors into standardized 4–20 mA or 0–10 V outputs. IC Role / Device Role / Timing Role: Precision transimpedance and voltage-output stage with programmable gain and offset correction. Use Value: Low IB prevents loading of high-impedance sensor bridges; wide supply range supports loop-powered 24 V systems. |
Use Scenario: Modular benchtop instrument (e.g., oscilloscope input stage, spectrum analyzer IF amplifier) requiring low-noise, low-distortion amplification. IC Role / Device Role / Timing Role: High-fidelity gain block in signal chain with THD+N <0.0008% at 1 kHz - preserving spectral purity. Use Value: 15 nV/√Hz input voltage noise and 3 fA/√Hz current noise minimize added uncertainty in low-level measurements. |
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 (12 nV/√Hz), higher quiescent current (2.2 mA/amp), same 4 MHz GBW | Better SNR in audio-grade or ultra-low-noise sensor apps; less suitable for battery-powered DAQ | Select when noise dominates error budget and power is secondary |
| TL074CDR | Higher input bias current (200 pA), lower GBW (3 MHz), wider temp range (–40°C to 105°C), lower cost | Acceptable for non-critical industrial monitoring where offset drift and noise are less constrained | Select for cost-sensitive, non-medical applications with relaxed precision requirements |
Compared with OPA4131UA/1K, the OPA4132UA improves voltage noise but increases power draw, while the TL074CDR trades precision for cost and temperature range - making OPA4131UA/1K the optimal balance for medical-grade DAQ and field instrumentation.
Availability
OPA4131UA/1K is available at Aetrix Electronics and suitable for electrocardiogram (ECG) systems, industrial data acquisition modules, and laboratory instrumentation requiring stable component supply across long product lifecycles.
Supply support for OPA4131UA/1K 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 series was developed specifically for general-purpose, high-accuracy analog signal conditioning in instrumentation, medical, and industrial applications - emphasizing FET-input performance, reliability, and pin-compatible scalability across single/dual/quad variants.
FAQ
What is the maximum capacitive load the OPA4131UA/1K can drive without instability?
The OPA4131UA/1K is characterized for stable operation with ≥300 pF capacitive loads, as verified in Figure 5-15 of the datasheet. This eliminates the need for isolation resistors in ADC driver or active filter applications, unlike many competing FET-input op amps that require external compensation above 50 pF.
Does the OPA4131UA/1K exhibit phase reversal when input common-mode voltage exceeds rails?
No - the OPA4131UA/1K is explicitly designed to prevent output phase reversal even when inputs exceed the common-mode voltage range (CMVR). This behavior is guaranteed across all four channels and is critical for maintaining control-loop integrity in flow transmitter and ECG applications.
What is the operating temperature range for the OPA4131UA/1K?
The OPA4131UA/1K is rated for ambient temperatures from –40°C to +85°C, as confirmed in the PACKAGE OPTION ADDENDUM. This range supports deployment in industrial environments, portable medical devices, and field-deployed instrumentation without derating.
How does the OPA4131UA/1K differ from the OPA4131NA variant?
The OPA4131UA/1K uses a 16-pin SOIC (DW) package with tape-and-reel packaging (1000 units), while the OPA4131NA uses a 14-pin SOIC (D) package in tube format. Both share identical electrical specifications, but the DW package offers better thermal resistance (RθJA = 110°C/W vs 80°C/W for PDIP) and improved manufacturability for automated assembly.
Is the OPA4131UA/1K RoHS compliant and lead-free?
Yes - the OPA4131UA/1K carries "Yes" in the RoHS column of TI's official PACKAGE OPTION ADDENDUM and uses NIPDAUAG (nickel-palladium-gold) lead finish, meeting JEDEC J-STD-020 moisture sensitivity Level-3 and RoHS Directive 2011/65/EU requirements.
OPA4131UA/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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/1K FAQ
1.How can I place an order for OPA4131UA/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4131UA/1K 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/1K reliable?
The price and inventory of OPA4131UA/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4131UA/1K is usually 5 days.
3.What payment methods are accepted for OPA4131UA/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4131UA/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4131UA/1K?
OPA4131UA/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4131UA/1K 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/1K?
For technical support, including OPA4131UA/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4131UA/1K requirements.
6.How does Aetrix verify that OPA4131UA/1K is sourced from the original manufacturer or authorized distributors?
All OPA4131UA/1K 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/1K meets industry standards.
7.What is the process for return or replacement of OPA4131UA/1K?
All OPA4131UA/1K units undergo pre-shipment inspection (PSI). If there is an issue with OPA4131UA/1K, 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/1K part is unused and in its original packaging.
Return procedure for OPA4131UA/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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