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Texas Instruments OPA2131UAE4
- Part No.:
- OPA2131UAE4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2131UAE4.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,822
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Product details
Overview
OPA2131UAE4 from Texas Instruments is a dual-channel, FET-input operational amplifier optimized for precision analog signal conditioning in low-noise, high-impedance sensor interfaces and instrumentation. It delivers 4MHz gain-bandwidth, 10V/μs slew rate, ±750μV max input offset voltage, and 50pA max input bias current across –40°C to +85°C, enabling stable transimpedance and ECG front-end designs.
For engineers reviewing the OPA2131UAE4 datasheet, OPA2131UAE4 pinout, OPA2131UAE4 application, or OPA2131UAE4 equivalent, key selection criteria include its SOIC-8 package compatibility, dual independent amplifier architecture, rail-to-rail output swing limitations (±2.5V from rails), low 1.75mA per-amplifier quiescent current, and absence of phase reversal under common-mode overvoltage conditions.
Technical Context
The OPA2131UAE4 implements a JFET-input differential pair with laser-trimmed offset voltage, delivering unity-gain stability without external compensation. Its internal architecture supports operation from ±4.5V to ±18V supplies and maintains >70dB CMRR over –12V to +11.5V common-mode range.
Each channel features fully isolated circuitry-no crosstalk between amplifiers-and supports capacitive loads up to 300pF while maintaining <0.1% settling in 1.5μs for 10V steps. Input voltage noise is 15nV/√Hz at 1kHz, and input current noise is 3fA/√Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 4MHz - Enables stable closed-loop gain ≥10 at 400kHz or G=1 at 4MHz without peaking. |
| Slew Rate | 10V/μs - Supports full-scale 10V output transitions in ≤1μs, critical for pulse amplification and fast-settling filters. |
| Input Offset Voltage | ±750μV max - Limits DC error to <0.0075% of 10V full scale; no external trim required in most applications. |
| Input Bias Current | ±50pA max - Allows use with >100MΩ source impedances (e.g., pH electrodes, piezoelectric sensors) without significant voltage drop. |
| Supply Voltage Range | ±4.5V to ±18V - Compatible with legacy industrial ±5V, ±12V, and ±15V rails; single-supply operation up to 36V possible. |
| Quiescent Current | ±1.75mA per amplifier - Enables dual-channel precision amplification within 3.5mA total, suitable for battery-powered instrumentation. |
| Common-Mode Rejection | 70dB min - Rejects 316:1 ratio of common-mode to differential signal, essential for noisy industrial environments. |
Pinout & Package
OPA2131UAE4 is housed in an 8-pin SOIC (D) surface-mount package with standard industry pinout and 1.27mm pitch. Thermal resistance is RθJA = 150°C/W, supporting operation up to +85°C ambient with minimal heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Output | Amplifier A output; drives loads ≥2kΩ; swings to within 2.5V of either supply rail. |
| –IN A (Pin 2) | Input | Inverting input for Channel A; high-impedance FET node (≥1012Ω || 4.3pF). |
| +IN A (Pin 3) | Input | Noninverting input for Channel A; identical impedance and bias characteristics as –IN A. |
| V– (Pin 4) | Power | Negative supply connection; must be decoupled with ≥10nF ceramic capacitor near pin. |
| +IN B (Pin 5) | Input | Noninverting input for Channel B; electrically isolated from Channel A; no crosstalk. |
| –IN B (Pin 6) | Input | Inverting input for Channel B; matches Channel A performance across temperature and supply. |
| OUT B (Pin 7) | Output | Amplifier B output; independently buffered; supports same load and settling specs as OUT A. |
| V+ (Pin 8) | Power | Positive supply connection; requires local 10nF ceramic bypass to V– for stability. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal on CM overvoltage | Prevents catastrophic output inversion when inputs exceed (V–)+3V or (V+)-3.5V-critical in voltage-follower sensor buffers. |
| Laser-trimmed input offset | Eliminates need for external nulling circuits; ±750μV max ensures <0.0075% gain error in 10V-range systems. |
| Unity-gain stable | Operates reliably at G=1 without external compensation components, reducing BOM count and layout area. |
| Excellent capacitive load drive | Stable with ≥300pF loads-enables direct driving of ADC input filters or long cables without isolation resistors. |
| Low 1/f noise corner | 15nV/√Hz at 1kHz and flat spectral density down to 10Hz support precision DC-coupled measurements. |
Applications
| Data Acquisition (DAQ) | Electrocardiogram (ECG) |
|---|---|
Use Scenario: High-resolution analog front-end for multi-channel industrial DAQ systems sampling thermocouples, strain gauges, and RTDs. IC Role / Device Role / Timing Role: Dual-channel precision buffer and programmable-gain stage; channels process differential sensor signals independently. Use Value: 50pA input bias enables accurate measurement from high-Z sensors; 4MHz bandwidth supports oversampling at ≥100kSPS with minimal aliasing. | Use Scenario: First-stage amplification in portable or bedside ECG monitors capturing microvolt-level cardiac signals. IC Role / Device Role / Timing Role: Low-noise, high-CMRR instrumentation amplifier core (with external resistors); rejects 50/60Hz mains interference. Use Value: 15nV/√Hz input voltage noise preserves signal integrity below 100μV; no phase reversal prevents false arrhythmia detection during lead disconnection. |
| Lab Instrumentation | Flow Transmitter |
Use Scenario: Signal conditioning in benchtop multimeters, oscilloscope vertical amplifiers, and calibration sources. IC Role / Device Role / Timing Role: Precision gain stage and active filter section; handles both AC and DC coupled inputs with minimal drift. Use Value: ±2μV/°C offset drift ensures <10μV error over 0–50°C lab environment; 10V/μs slew supports fast transient capture. | Use Scenario: Analog signal processing in Coriolis or magnetic flow meters converting sensor outputs to 4–20mA loop signals. IC Role / Device Role / Timing Role: Sensor interface amplifier feeding voltage-to-current converter; operates from loop-powered ±12V rails. Use Value: ±18V supply tolerance matches industrial power standards; 1.75mA per channel minimizes loop power consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2132UA | Lower input bias current (1pA typ), higher GBW (8MHz), but higher quiescent current (2.2mA/ch) and cost. | Better for ultra-high-Z photodiode or electrophysiology sensors; less suitable for battery-constrained devices. | Select OPA2132UA only when sub-picoampere bias is mandatory and power budget allows +0.45mA/ch increase. |
| TL072CDR | Higher input bias (30pA typ), lower GBW (3MHz), no laser trimming (±10mV VOS), but lower cost and wider temp range (–40°C to +105°C). | Acceptable for non-critical audio or industrial control where offset drift and noise are secondary. | Choose TL072CDR for cost-sensitive, non-precision applications where ±10mV offset and 30pA bias are tolerable. |
Compared with OPA2131UAE4, the OPA2132UA trades higher power for lower bias current and wider bandwidth, while the TL072CDR sacrifices precision and stability for cost and temperature robustness-making OPA2131UAE4 the optimal balance for general-purpose precision analog design.
Availability
OPA2131UAE4 is available at Aetrix Electronics and suitable for data acquisition (DAQ), electrocardiogram (ECG) monitoring, lab instrumentation, and flow transmitter applications requiring stable component supply, long-term manufacturability, and TI's production-grade reliability.
Supply support for OPA2131UAE4 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-sensitive, high-performance analog signal conditioning in industrial, medical, and test equipment-emphasizing FET-input advantages without premium pricing.
FAQ
What is the maximum operating temperature range for the OPA2131UAE4?
The OPA2131UAE4 is rated for operation from –40°C to +85°C ambient temperature. This range is validated per TI's Recommended Operating Conditions and supported by thermal metrics including RθJA = 150°C/W. Operation beyond +85°C ambient may cause parametric shift or reliability degradation and is not guaranteed.
Does the OPA2131UAE4 require external compensation for unity-gain stability?
No, the OPA2131UAE4 is internally compensated for unity-gain stability. It drives resistive and capacitive loads up to 300pF without oscillation or peaking, eliminating the need for external compensation networks. This simplifies PCB layout and reduces component count in buffer and follower configurations.
Can the OPA2131UAE4 be used in single-supply configurations?
Yes, the OPA2131UAE4 supports single-supply operation with total supply voltage up to 36V (e.g., 0V to +36V). Input common-mode range extends to (V–) + 3V and (V+) – 3.5V, and output swings to within 2.5V of each rail-enabling use in 5V, 12V, or 24V systems with appropriate level-shifting or rail-splitting.
What is the input impedance of the OPA2131UAE4?
The OPA2131UAE4 features a FET-input stage with differential input impedance of 1010Ω || 5pF and common-mode input impedance of 1012Ω || 4.3pF. This ultra-high impedance minimizes loading on high-output-impedance sensors such as piezoelectric elements, pH probes, and photodiodes.
Is the OPA2131UAE4 pin-compatible with other dual op amps in SOIC-8 packages?
The OPA2131UAE4 uses the industry-standard dual op amp pinout (Pin 1 = OUT A, Pin 2 = –IN A, Pin 3 = +IN A, Pin 4 = V–, Pin 5 = +IN B, Pin 6 = –IN B, Pin 7 = OUT B, Pin 8 = V+), matching TL072, NE5532, and OPA2132. However, electrical behavior-including bias current, offset, and noise-differs significantly; verify system-level performance before substitution.
OPA2131UAE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
OPA2131UAE4 FAQ
1.How can I place an order for OPA2131UAE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2131UAE4 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 OPA2131UAE4 reliable?
The price and inventory of OPA2131UAE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2131UAE4 is usually 5 days.
3.What payment methods are accepted for OPA2131UAE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2131UAE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2131UAE4?
OPA2131UAE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2131UAE4 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 OPA2131UAE4?
For technical support, including OPA2131UAE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2131UAE4 requirements.
6.How does Aetrix verify that OPA2131UAE4 is sourced from the original manufacturer or authorized distributors?
All OPA2131UAE4 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 OPA2131UAE4 meets industry standards.
7.What is the process for return or replacement of OPA2131UAE4?
All OPA2131UAE4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2131UAE4, 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 OPA2131UAE4 part is unused and in its original packaging.
Return procedure for OPA2131UAE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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