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Texas Instruments OPA131UA/2K5
- Part No.:
- OPA131UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA131UA/2K5.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,741
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Product details
Overview
OPA131UA/2K5 from Texas Instruments is a single-channel, FET-input operational amplifier in SOIC-8 package, delivering 4MHz gain-bandwidth, 10V/µs slew rate, and ±750µV max input offset voltage across –40°C to +85°C. It operates from ±4.5V to ±18V supplies and drives capacitive loads robustly-ideal for precision sensor signal conditioning in industrial data acquisition systems.
For engineers reviewing the OPA131UA/2K5 datasheet, OPA131UA/2K5 pinout, OPA131UA/2K5 application, or OPA131UA/2K5 equivalent, key selection criteria include its 50pA max input bias current, unity-gain stability, offset trim capability (pins 1 & 5), and SOIC-8 thermal resistance of 150°C/W-critical for low-drift, high-impedance front-end designs.
Technical Context
The OPA131UA/2K5 employs a JFET-input stage enabling ultra-low input bias current (5pA typ at 25°C) and high input impedance (10¹² Ω || 3pF common-mode). Its fully differential architecture ensures excellent channel independence and eliminates output phase reversal under common-mode overvoltage-a known failure mode in legacy FET op amps.
Internally compensated for unity-gain stability, it achieves 4MHz bandwidth with 10V/µs slew rate and 0.01% settling in 2µs (10V step, CL = 100pF). The device supports rail-to-rail output swing within ±2.5V of supply rails and maintains >70dB CMRR from 10Hz to 100kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 50pA max - enables high-impedance sensor interfacing without significant DC error |
| Input Offset Voltage | ±750µV max - ensures sub-millivolt DC accuracy in precision amplification stages |
| Gain-Bandwidth Product | 4MHz - supports stable closed-loop gain ≥1 with usable bandwidth up to 4MHz |
| Slew Rate | 10V/µs - allows clean amplification of fast 10V-step signals with minimal distortion |
| Supply Voltage Range | ±4.5V to ±18V - accommodates dual-supply industrial systems from ±5V to ±15V rails |
| Quiescent Current | 1.75mA max per amplifier - balances performance and power efficiency in battery-adjacent circuits |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
Pinout & Package
OPA131UA/2K5 is housed in an 8-pin SOIC (SO-8, package drawing D) with 1.27mm pitch, 3.9mm width, and 1.75mm max height. Thermal resistance θJA is 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (–) | Connects to wiper of external 100kΩ potentiometer for manual nulling of input offset voltage |
| 2 | Inverting Input (–In) | Differential input node; high-impedance JFET gate with 10¹² Ω || 3pF input impedance |
| 3 | Non-Inverting Input (+In) | Differential input node; identical impedance and bias characteristics as Pin 2 |
| 4 | V– | Negative supply rail connection; must be bypassed with ≥10nF ceramic capacitor near pin |
| 5 | Offset Trim (+) | Connects to one end of external 100kΩ potentiometer; forms adjustable voltage divider for offset correction |
| 6 | Output | Class-AB output stage capable of ±25mA short-circuit current and ±12.5V swing into 2kΩ load |
| 7 | V+ | Positive supply rail connection; requires local 10nF ceramic decoupling for stability |
| 8 | No Connection (NC) | Internally unconnected; must remain floating-no external tie or pull-up/down |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture | 5pA typical input bias current at 25°C enables direct interfacing with high-Z sources like piezoelectric sensors or pH electrodes |
| Offset voltage trim pins | Pins 1 and 5 support external 100kΩ potentiometer for system-level offset calibration-±20mV typical trim range |
| No phase reversal | Guaranteed immunity to output polarity inversion when input common-mode voltage exceeds rails-critical for voltage-follower stability |
| Capacitive load drive | Stable operation with ≥100pF load capacitance without external compensation-reduces layout sensitivity in PCB routing |
| Unity-gain stable | Internally compensated for G ≥ 1; eliminates need for external feedback compensation components in buffer or gain-of-one configurations |
Applications
| Strain Gauge Signal Conditioning | Thermocouple Amplifier Front-End |
|---|---|
Use Scenario: Amplifying µV-level Wheatstone bridge outputs from metal foil strain gauges in load cells, with 50Hz/60Hz notch filtering and low-frequency drift suppression. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier core (configured as non-inverting gain stage) leveraging ultra-low IB and VOS for <10µV offset contribution. Use Value: Enables 16-bit effective resolution in 24-bit ADC systems by limiting amplifier-induced offset drift to <0.1µV/°C over industrial temperature range. | Use Scenario: Cold-junction compensation and linearization of Type-K thermocouple outputs in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: High-impedance buffer and gain stage preceding cold-junction sensor and ADC, rejecting EMI via differential input configuration. Use Value: Maintains <±0.5°C measurement accuracy over –40°C to +85°C ambient by minimizing input bias current-induced errors in high-resistance thermocouple leads. |
| Photodiode Transimpedance Amplifier | Active Filter for Sensor Data Acquisition |
Use Scenario: Converting nanoampere photocurrent from silicon photodiodes into voltage for optical smoke detection or spectrophotometry. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with feedback resistor ≥10MΩ, exploiting FET input to prevent leakage-induced gain error. Use Value: Achieves <0.1% gain error at 100pA input due to 50pA max IB-enabling reliable detection of weak optical signals in safety-critical applications. | Use Scenario: Implementing 2nd-order low-pass anti-aliasing filters (e.g., Sallen-Key) before sigma-delta ADCs in vibration monitoring systems. IC Role / Device Role / Timing Role: Unity-gain stable active filter section with precise pole placement enabled by 4MHz GBW and 10V/µs slew rate. Use Value: Delivers <0.01% THD+N at 1kHz while maintaining 100dB stopband attenuation-ensuring clean digitization of mechanical resonance signatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET-input operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL071CP | Higher input bias current (30pA typ vs 5pA), wider offset voltage spread (±10mV max), no offset trim pins | Limited suitability for <100pA current-sensing; no provision for system-level offset calibration | Choose TL071CP only if cost is primary constraint and ±10mV VOS is acceptable in non-critical AC-coupled paths |
| OPA140AIDBVR | Lower input bias current (0.3pA typ), lower noise (5.1nV/√Hz), rail-to-rail output, but higher quiescent current (1.8mA vs 1.75mA) | Better for ultra-low-noise, high-resolution data loggers; not pin-compatible-requires PCB redesign | Choose OPA140AIDBVR when sub-10nV/√Hz noise and picoampere bias are mandatory, accepting SO-8 footprint change and higher cost |
Compared with TL071CP and OPA140AIDBVR, the OPA131UA/2K5 uniquely balances ultra-low input bias current, factory-trimmed offset voltage, and dedicated offset trim pins in a standard SO-8 footprint-making it optimal for cost-sensitive industrial instrumentation requiring field-calibratable DC precision.
Availability
OPA131UA/2K5 is available at Aetrix Electronics and suitable for industrial sensor interfaces, precision data acquisition front-ends, and analog signal conditioning modules requiring stable component supply and long-term manufacturability.
Supply support for OPA131UA/2K5 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 leadership in precision op amp design and manufacturing.
The OPA131 series belongs to TI's general-purpose FET-input op amp product line, engineered specifically for industrial and instrumentation applications demanding low input bias current, low offset voltage, and robust capacitive load drive without external compensation.
FAQ
What is the maximum input common-mode voltage range for the OPA131UA/2K5?
The OPA131UA/2K5 supports a common-mode input voltage range of (V–) + 3V to (V+) – 1V. For example, with ±15V supplies, inputs may swing from –12V to +14V. This range ensures compatibility with most industrial sensor outputs and prevents phase reversal-a known issue mitigated by TI's internal circuitry in the OPA131UA/2K5.
Does the OPA131UA/2K5 require external compensation for unity-gain stability?
No, the OPA131UA/2K5 is internally compensated and unity-gain stable. It does not require external compensation components when configured as a voltage follower or in any closed-loop gain ≥1 configuration. This simplifies design and improves reliability in the OPA131UA/2K5-based circuits used for buffering high-impedance sources.
Can the OPA131UA/2K5 drive heavy capacitive loads without oscillation?
Yes-the OPA131UA/2K5 is characterized for stable operation with ≥100pF capacitive loads, as confirmed in its typical overshoot vs. load capacitance curves. While heavier loads (>1nF) may benefit from isolation resistors, the OPA131UA/2K5's robust output stage and internal compensation eliminate the need for external compensation in most sensor interface and filter applications.
What is the purpose of pins 1 and 5 on the OPA131UA/2K5?
Pins 1 and 5 on the OPA131UA/2K5 are dedicated offset voltage trim terminals. They allow connection of a 100kΩ potentiometer to null the amplifier's input offset voltage-typically ±20mV trim range. This feature enables system-level calibration to achieve sub-microvolt residual offset, a capability not found in many competing FET-input op amps like the TL071CP or OPA140AIDBVR.
Is the OPA131UA/2K5 RoHS-compliant and lead-free?
Yes, the OPA131UA/2K5 is RoHS-compliant and lead-free, with "Green (RoHS & no Sb/Br)" eco plan designation and NIPDAU-DCC lead finish. It meets JEDEC MSL Level-3 moisture sensitivity classification and is rated for peak reflow temperatures up to 260°C-fully compatible with modern lead-free PCB assembly processes for the OPA131UA/2K5.
OPA131UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- 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
OPA131UA/2K5 FAQ
1.How can I place an order for OPA131UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA131UA/2K5 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 OPA131UA/2K5 reliable?
The price and inventory of OPA131UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA131UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA131UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA131UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA131UA/2K5?
OPA131UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA131UA/2K5 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 OPA131UA/2K5?
For technical support, including OPA131UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA131UA/2K5 requirements.
6.How does Aetrix verify that OPA131UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA131UA/2K5 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 OPA131UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA131UA/2K5?
All OPA131UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA131UA/2K5, 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 OPA131UA/2K5 part is unused and in its original packaging.
Return procedure for OPA131UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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