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Texas Instruments OPA2131UA/2K5E4
- Part No.:
- OPA2131UA/2K5E4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2131UA/2K5E4.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,889
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Product details
Overview
OPA2131UA/2K5E4 from Texas Instruments is a dual-channel, FET-input operational amplifier in an 8-pin SOIC package, delivering 4MHz gain-bandwidth, 10V/μs slew rate, and ≤750μV input offset voltage at ±15V supply. It operates from ±4.5V to ±18V, supports rail-to-rail output swing within 2.5V of rails, and is optimized for precision signal conditioning in electrocardiogram (ECG) front-ends and data acquisition systems.
For engineers reviewing the OPA2131UA/2K5E4 datasheet, OPA2131UA/2K5E4 pinout, OPA2131UA/2K5E4 application, or OPA2131UA/2K5E4 equivalent, key selection criteria include its 50pA max input bias current, unity-gain stability, excellent capacitive load drive (up to 300pF), and guaranteed performance over –40°C to +85°C ambient temperature.
Technical Context
The OPA2131UA/2K5E4 implements a fully differential, laser-trimmed FET-input architecture with independent channel circuitry-no crosstalk between amplifiers. Its input stage uses JFET transistors to achieve ultra-low input bias current (≤50pA), while internal compensation ensures unity-gain stability without external components.
It features robust common-mode rejection (≥70dB), power-supply rejection (≥50μV/V), and open-loop gain ≥94dB. The device avoids phase reversal under common-mode overvoltage-a known failure mode in legacy FET op amps-making it suitable for voltage-follower and high-impedance sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 4 MHz - Enables stable closed-loop operation up to 400 kHz at G = 10 without peaking. |
| Slew Rate | 10 V/μs - Supports fast transient response in active filters and pulse amplification stages. |
| Input Offset Voltage | ±0.75 mV max - Reduces DC error in precision instrumentation without trimming. |
| Input Bias Current | ±50 pA max - Minimizes voltage drop across high-impedance sources (e.g., pH electrodes, piezoelectric sensors). |
| Supply Voltage Range | ±4.5 V to ±18 V - Compatible with industrial ±5V, ±12V, and ±15V power rails. |
| Output Voltage Swing | (V–)+2.5 V to (V+)-2.5 V @ 2kΩ - Delivers >5Vpp linear output into standard loads without clipping. |
| Quiescent Current | ±1.75 mA per amplifier - Balances low power consumption with dynamic performance for battery-aware designs. |
Pinout & Package
OPA2131UA/2K5E4 is housed in an industry-standard 8-pin SOIC (D) package, surface-mount compatible, with 1.27 mm pitch and JEDEC MS-012AC dimensions (4.9 mm × 3.91 mm). Thermal resistance RθJA is 150°C/W, supporting operation up to +85°C ambient without forced cooling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Output | Amplified signal from Channel A; capable of sourcing/sinking ±20 mA. |
| –IN A (Pin 2) | Input | Inverting input for Channel A; high-impedance FET node (Zin = 1012 Ω || 4.3 pF). |
| +IN A (Pin 3) | Input | Noninverting input for Channel A; matched to –IN A for CMRR ≥70 dB. |
| V– (Pin 4) | Power | Negative supply rail; must be decoupled with ≥10 nF ceramic capacitor near pin. |
| +IN B (Pin 5) | Input | Noninverting input for Channel B; electrically isolated from Channel A. |
| –IN B (Pin 6) | Input | Inverting input for Channel B; no crosstalk with Channel A inputs or outputs. |
| OUT B (Pin 7) | Output | Amplified signal from Channel B; independently buffered and short-circuit protected. |
| V+ (Pin 8) | Power | Positive supply rail; requires local 10 nF ceramic bypass to minimize PSRR degradation. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal on common-mode overvoltage | Prevents catastrophic output inversion in voltage-follower configurations when input exceeds (V–)+3 V or (V+)-3.5 V. |
| Laser-trimmed input offset | Eliminates need for external nulling circuitry in ECG and DAQ front-ends, reducing BOM count and layout area. |
| Capacitive load drive up to 300 pF | Stable operation into long cables or ADC input capacitance without isolation resistors or external compensation. |
| Independent dual-channel architecture | Full functional isolation allows one channel to operate normally even if the other is overdriven or shorted. |
| Low 1/f noise corner | 15 nV/√Hz at 1 kHz enables high-SNR signal conditioning in sub-10 Hz biomedical applications like ECG. |
Applications
| Electrocardiogram (ECG) Front-End | Data Acquisition (DAQ) Signal Conditioning |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from Ag/AgCl electrodes with high common-mode interference. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier first stage (gain = 10–100), providing high-Z input, low noise, and CMRR enhancement. Use Value: 50pA input bias current prevents electrode polarization drift; 750μV offset minimizes baseline wander without digital correction. |
Use Scenario: Buffering and scaling analog sensor outputs (e.g., RTDs, strain gauges) before 16-bit SAR ADC sampling. IC Role / Device Role / Timing Role: Precision unity-gain buffer and programmable gain stage in multi-channel DAQ modules. Use Value: 4MHz GBW supports settling <2μs for 0.01% accuracy at 100kSPS; rail-swing capability maximizes dynamic range. |
| Lab Instrumentation Amplifier | Flow Transmitter Analog Output Stage |
Use Scenario: Building modular benchtop instruments requiring low-drift, low-noise amplification with user-selectable gain. IC Role / Device Role / Timing Role: Core gain block in programmable-gain instrumentation amplifiers (PGIA) with switchable feedback networks. Use Value: Laser-trimmed offset and <10μV/°C drift ensure calibration stability over temperature; dual channels simplify differential output generation. |
Use Scenario: Converting 4–20mA loop current to isolated 0–5V/0–10V analog output in industrial flow meters. IC Role / Device Role / Timing Role: Low-offset, low-drift I-to-V converter and output driver with overvoltage protection. Use Value: ±750μV offset contributes <0.015% full-scale error in 4–20mA conversion; wide supply range accommodates 24V loop-powered designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL072CDR | Higher input bias current (300pA typ), lower GBW (3MHz), no guaranteed phase-reversal immunity. | Cost-sensitive audio and general-purpose circuits where ultra-low IB is not required. | Choose TL072CDR only if budget constraints outweigh precision requirements and phase-reversal risk is mitigated by design. |
| OPA2141AIDR | Lower offset (±125μV), lower noise (11nV/√Hz), higher price; same SOIC-8 package and pinout. | High-end medical and test equipment demanding tighter DC accuracy and lower 1/f noise. | OPA2141AIDR offers measurable improvement in offset and noise but at ~2.5× cost; verify ROI against system-level SNR targets. |
Compared with TL072CDR, OPA2131UA/2K5E4 delivers 6× lower input bias current and guaranteed phase-reversal immunity-critical for unattended sensor front-ends. Against OPA2141AIDR, it trades 3× higher offset and 35% higher voltage noise for 60% lower unit cost and proven field reliability in industrial DAQ.
Availability
OPA2131UA/2K5E4 is available at Aetrix Electronics and suitable for electrocardiogram (ECG) systems, industrial flow transmitters, and lab instrumentation requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for OPA2131UA/2K5E4 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 over 90 years of innovation in precision amplifiers and signal chain solutions.
The OPAx131 family was designed for cost-effective, high-performance general-purpose amplification in industrial, medical, and test equipment-emphasizing FET-input advantages without premium pricing.
FAQ
What is the maximum operating temperature range for the OPA2131UA/2K5E4?
The OPA2131UA/2K5E4 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 SOIC-packaged variants including OPA2131UA/2K5E4. Junction temperature must remain ≤125°C under worst-case power dissipation and PCB thermal design.
Does the OPA2131UA/2K5E4 require external compensation for unity-gain stability?
No, the OPA2131UA/2K5E4 is internally compensated for unity-gain stability. It drives capacitive loads up to 300pF without oscillation or excessive overshoot, as confirmed in Figure 5-15 of the SBOS040B datasheet. No external compensation network is needed for G ≥ 1 configurations.
Is the OPA2131UA/2K5E4 pin-compatible with other dual op amps in SOIC-8 packages?
OPA2131UA/2K5E4 follows 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 OPA2141. However, electrical behavior-including phase-reversal immunity and input bias-differs significantly.
What is the typical input voltage noise density of the OPA2131UA/2K5E4 at 1kHz?
The typical input voltage noise density of the OPA2131UA/2K5E4 at 1kHz is 15 nV/√Hz, as specified in Section 5.6 of the SBOS040B datasheet. This value remains stable across frequency above 100Hz and supports high-SNR signal conditioning in biomedical and sensor applications.
Can the OPA2131UA/2K5E4 be used with single-supply operation?
Yes, the OPA2131UA/2K5E4 supports single-supply operation from 9V to 36V. Its 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 12V or 24V systems with appropriate level-shifting or rail-splitting networks.
OPA2131UA/2K5E4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
OPA2131UA/2K5E4 FAQ
1.How can I place an order for OPA2131UA/2K5E4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2131UA/2K5E4 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 OPA2131UA/2K5E4 reliable?
The price and inventory of OPA2131UA/2K5E4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2131UA/2K5E4 is usually 5 days.
3.What payment methods are accepted for OPA2131UA/2K5E4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2131UA/2K5E4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2131UA/2K5E4?
OPA2131UA/2K5E4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2131UA/2K5E4 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 OPA2131UA/2K5E4?
For technical support, including OPA2131UA/2K5E4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2131UA/2K5E4 requirements.
6.How does Aetrix verify that OPA2131UA/2K5E4 is sourced from the original manufacturer or authorized distributors?
All OPA2131UA/2K5E4 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 OPA2131UA/2K5E4 meets industry standards.
7.What is the process for return or replacement of OPA2131UA/2K5E4?
All OPA2131UA/2K5E4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2131UA/2K5E4, 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 OPA2131UA/2K5E4 part is unused and in its original packaging.
Return procedure for OPA2131UA/2K5E4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2131UA/2K5E4 Tags
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