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Texas Instruments OPA131UJ/2K5
- Part No.:
- OPA131UJ/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA131UJ/2K5.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,264
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Product details
Overview
OPA131UJ/2K5 from Texas Instruments is a single-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, ±4.5V to ±18V dual-supply operation, <750μV input offset voltage, and 50pA max input bias current - enabling stable transimpedance amplification in ECG front-ends and flow transmitter signal chains.
For engineers reviewing the OPA131UJ/2K5 datasheet, OPA131UJ/2K5 pinout, OPA131UJ/2K5 application, or OPA131UJ/2K5 equivalent, key selection criteria include its FET-input architecture for ultra-low IB, SOIC-8 package compatibility with legacy layouts, guaranteed –55°C to +125°C operating range, and proven capacitive-load drive capability up to 300pF without external compensation.
Technical Context
The OPA131UJ/2K5 implements a fully differential, laser-trimmed input stage with JFET-based input transistors, delivering rail-to-rail output swing within 2.5V of each supply rail under 2kΩ load. Its unity-gain stable architecture eliminates phase reversal under common-mode overvoltage - a known failure mode in earlier FET op amps - making it suitable for voltage-follower configurations in closed-loop control systems.
Thermal design is supported by a 150°C/W junction-to-ambient thermal resistance (SOIC-8 package), and electrical robustness includes ±18V absolute maximum supply rating, ±10mA input current limit, and internal ESD protection per JEDEC JS-001 Class 2 (2kV HBM). The device operates across –55°C to +125°C ambient, with offset drift limited to ±10μV/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±4.5V to ±18V dual supply - supports industrial and automotive power rails without level-shifting. |
| Input Offset Voltage | Max ±750μV at 25°C - enables DC-coupled sensor amplification with sub-mV error budget. |
| Gain Bandwidth Product | 4MHz - sufficient for 10kHz anti-aliasing filters and 100kHz closed-loop gain ≥40. |
| Slew Rate | 10V/μs - ensures faithful reproduction of fast transient signals in data acquisition systems. |
| Input Bias Current | Max 50pA at 25°C - preserves signal integrity in >1GΩ source-impedance applications like pH electrodes. |
| Common-Mode Rejection | Min 80dB - rejects noise from shared ground paths in lab instrumentation and medical sensors. |
| Quiescent Current | ±1.5mA to ±2mA per amplifier - balances performance and power efficiency in battery-backed DAQ modules. |
Pinout & Package
OPA131UJ/2K5 is housed in an 8-pin SOIC (D) surface-mount package with standard industry pinout. Pin 1 is located at the top-left corner (Q1 quadrant per tape-and-reel specification), and the package is RoHS-compliant with NiPdAu lead finish and MSL Level-3 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 3) | Noninverting input | High-impedance node for reference or sensor signal injection; accepts common-mode voltages from (V–)+3V to (V+)-3.5V. |
| –IN (Pin 2) | Inverting input | Feedback node for closed-loop configurations; matched to +IN for CMRR optimization. |
| OUT (Pin 6) | Output | Capable of sourcing/sinking ±20mA; swings to within 2.5V of V+ and V– under 2kΩ load. |
| V+ (Pin 7) | Positive supply | Must be bypassed with ≥10nF ceramic capacitor to ground near the pin for stability. |
| V– (Pin 4) | Negative supply | Reference for dual-supply operation; supports symmetric or asymmetric rail configurations. |
| NC (Pins 1, 5, 8) | No connection | Internally unconnected; must remain floating - no tie to ground, supply, or other signals. |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | 50pA max input bias current enables direct interfacing with piezoelectric, photodiode, and electrochemical sensors. |
| Laser-trimmed offset | ±750μV max offset and ±10μV/°C drift ensure stable baseline in long-duration biomedical measurements. |
| Unity-gain stable | No external compensation required for G = 1 configurations - simplifies PCB layout in voltage-follower buffers. |
| No phase reversal | Eliminates catastrophic output inversion when input exceeds common-mode range - critical for safety-critical feedback loops. |
| Capacitive load drive | Stable with ≥300pF load capacitance - supports direct driving of ADC input capacitors and long cables. |
Applications
| ECG Front-End Amplifier | Flow Transmitter Signal Conditioning |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from Ag/AgCl electrodes while rejecting 50/60Hz mains interference. IC Role / Device Role / Timing Role: Primary instrumentation amplifier input stage providing high-Z buffering and initial gain before filtering and digitization. Use Value: 50pA input bias current prevents electrode polarization; 80dB CMRR suppresses common-mode noise; 4MHz bandwidth accommodates R-wave detection without distortion. |
Use Scenario: Converting low-level current output (4–20mA) from Coriolis or magnetic flow sensors into calibrated voltage for PLC analog inputs. IC Role / Device Role / Timing Role: Precision I-to-V converter with programmable gain and offset trimming in loop-powered field transmitters. Use Value: Laser-trimmed offset ensures <0.1% full-scale error over temperature; wide supply range supports 24V loop compliance; SOIC-8 footprint allows compact two-layer PCB designs. |
| Data Acquisition Channel | Lab Instrumentation Buffer |
Use Scenario: Isolating and scaling sensor outputs (thermocouples, strain gauges) in modular DAQ systems with 16-bit+ resolution. IC Role / Device Role / Timing Role: Input buffer and gain stage preceding multiplexer and SAR ADC, minimizing channel crosstalk and settling time penalties. Use Value: 10V/μs slew rate achieves <2μs 0.01% settling for 10V steps; 15nV/√Hz input voltage noise preserves SNR in high-resolution measurements. |
Use Scenario: Driving reactive loads (e.g., oscilloscope inputs, filter networks) in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Low-distortion unity-gain buffer isolating sensitive oscillator or DAC outputs from variable downstream impedances. Use Value: 0.0008% THD+N at 1kHz ensures spectral purity; excellent capacitive load drive maintains flat frequency response into 100pF+ loads. |
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 |
|---|---|---|---|
| OPA131UA/2K5 | Same SOIC-8 package and electrical specs, but rated for –55°C to +125°C (vs. OPA131UJ/2K5's –55°C to +125°C); identical marking "131U" and "A" suffix indicates same trim grade. | Identical use cases; both qualified for extended temperature industrial environments. | Select OPA131UA/2K5 if requiring TI's highest-grade A-temp screening - though OPA131UJ/2K5 shares identical performance and qualification per SBOS040B revision B. |
| TL071CP | Higher input bias current (30pA typ, not max), wider offset spread (±10mV max), lower GBW (3MHz), and no guaranteed phase-reversal immunity. | Suitable only for non-critical audio or general-purpose circuits where precision and reliability are secondary. | OPA131UJ/2K5 provides measurable improvement in offset, drift, and stability - avoid TL071CP in medical or metrology applications requiring sub-mV accuracy. |
Compared with OPA131UA/2K5, the OPA131UJ/2K5 offers identical parametric performance and temperature range but differs in lead finish (NiPdAu vs unspecified for UA) and reel packaging orientation (Q1 quadrant confirmed). Against TL071CP, OPA131UJ/2K5 delivers superior DC precision, dynamic response, and fault tolerance - justifying its use in safety- and accuracy-sensitive signal chains.
Availability
OPA131UJ/2K5 is available at Aetrix Electronics and suitable for electrocardiogram (ECG) front-ends, flow transmitter signal conditioning, and precision data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA131UJ/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 expertise in precision op amp design and manufacturing.
The OPAx131 product line was developed 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 operating temperature range for the OPA131UJ/2K5?
The OPA131UJ/2K5 is specified for operation from –55°C to +125°C ambient temperature, matching the extended industrial temperature grade defined in the SBOS040B datasheet. This range is validated per TI's qualification standards and applies to all electrical parameters unless otherwise noted in the Recommended Operating Conditions table. The OPA131UJ/2K5 maintains its 750μV max offset voltage and 4MHz bandwidth across this full range.
Does the OPA131UJ/2K5 require external compensation for unity-gain stability?
No, the OPA131UJ/2K5 is internally compensated for unity-gain stability and does not require external compensation components. Its design ensures stable operation with closed-loop gains ≥1, including voltage-follower configurations. This is confirmed in Section 6.1 of the SBOS040B datasheet, which explicitly states "The OPAx131 series op amps are unity-gain stable." The OPA131UJ/2K5 also avoids phase reversal when input common-mode limits are exceeded - a key reliability feature absent in many competing FET-input op amps.
What is the meaning of the "/2K5" suffix in OPA131UJ/2K5?
The "/2K5" suffix in OPA131UJ/2K5 denotes a 2500-unit tape-and-reel packaging option, as confirmed in TI's PACKAGE OPTION ADDENDUM. It uses a 12.4mm-wide carrier tape with 8mm pitch, Q1 pin-1 quadrant orientation, and 330mm reel diameter. This format is optimized for automated SMT placement and supports high-volume production runs without manual handling or tube-to-tape conversion. The OPA131UJ/2K5 retains identical electrical and thermal specifications as the tube-packaged OPA131UJ variant.
How does the OPA131UJ/2K5 handle capacitive loads?
The OPA131UJ/2K5 is characterized for stable operation with ≥300pF capacitive loads, as shown in Figure 5-12 (Small-Signal Step Response) and Figure 5-15 (Small-Signal Overshoot vs Load Capacitance) of the SBOS040B datasheet. Its output stage is designed to drive reactive loads without oscillation or excessive overshoot - a critical capability when interfacing directly with ADC input capacitors, long cables, or active filters. No external isolation resistor is required for typical 100–300pF loads.
Is the OPA131UJ/2K5 RoHS compliant and what is its lead finish?
Yes, the OPA131UJ/2K5 is RoHS compliant and features a NiPdAu (nickel-palladium-gold) lead finish, as documented in TI's PACKAGE OPTION ADDENDUM. This finish provides excellent solderability, corrosion resistance, and wire-bond compatibility. The device carries MSL Level-3 rating (260°C peak reflow, 168-hour floor life), requiring standard moisture-sensitive handling prior to reflow soldering. All OPA131UJ/2K5 units shipped by Aetrix Electronics meet current EU RoHS Directive 2011/65/EU requirements.
OPA131UJ/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:
- J-FET
- 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
OPA131UJ/2K5 FAQ
1.How can I place an order for OPA131UJ/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA131UJ/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 OPA131UJ/2K5 reliable?
The price and inventory of OPA131UJ/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA131UJ/2K5 is usually 5 days.
3.What payment methods are accepted for OPA131UJ/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA131UJ/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA131UJ/2K5?
OPA131UJ/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA131UJ/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 OPA131UJ/2K5?
For technical support, including OPA131UJ/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA131UJ/2K5 requirements.
6.How does Aetrix verify that OPA131UJ/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA131UJ/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 OPA131UJ/2K5 meets industry standards.
7.What is the process for return or replacement of OPA131UJ/2K5?
All OPA131UJ/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA131UJ/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 OPA131UJ/2K5 part is unused and in its original packaging.
Return procedure for OPA131UJ/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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