OPA131UG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments OPA131UG4 is a precision FET-input operational amplifier with 50pA maximum bias current and 750µV maximum offset voltage in 8-pin SOIC package. Delivers 86dB typical common-mode rejection ratio suitable for high-impedance sensor signal conditioning. Available in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- OPA131UG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of OPA131UG4?
- Ultra-low 50pA maximum input bias current for accurate amplification of high-impedance sensor signals
- 750µV maximum input offset voltage with 86dB typical CMRR for precision instrumentation circuits
- 8-pin SOIC package with internal frequency compensation enabling stable unity-gain operation without external capacitors
What is OPA131UG4 used for?
The OPA131UG4 is optimized for precision instrumentation amplifiers, pH electrode interfaces, and photodiode transimpedance amplifiers where ultra-low input bias current is critical. Its 86dB CMRR makes it suitable for signal conditioning in industrial data acquisition systems and medical measurement equipment. The SOIC-8 package facilitates straightforward PCB integration in analog front-end designs requiring high input impedance and low offset.
What are the specifications of OPA131UG4?
| YTEOL | 0 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | VOLTAGE-FEEDBACK |
| Average Bias Current-Max (IIB) | 0.00005 µA |
| Bias Current-Max (IIB) @25C | 0.00005 µA |
| Common-mode Reject Ratio-Min | 70dB |
| Common-mode Reject Ratio-Nom | 86dB |
| Frequency Compensation | YES |
| Input Offset Voltage-Max | 750 µV |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Low-Bias | YES |
| Low-Offset | YES |
| Micropower | NO |
| Neg Supply Voltage Limit-Max | -18 V |
| Neg Supply Voltage-Nom (Vsup) | -15 V |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power | NO |
| Programmable Power | NO |
| Qualification Status | Not Qualified |
| Slew Rate-Nom | 10V/us |
| Supply Current-Max | 2mA |
| Supply Voltage Limit-Max | 18V |
| Supply Voltage-Nom (Vsup) | 15V |
| Surface Mount | YES |
| Technology | JFET |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Unity Gain BW-Nom | 4000 |
| Voltage Gain-Min | 100000 |
| Wideband | NO |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
Where can I find the OPA131UG4 datasheet?
OPA131UG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for OPA131UG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the maximum input bias current of the OPA131UG4 and why is it critical for pH electrode applications?
The OPA131UG4 has a maximum input bias current of 50pA (0.00005µA), which is essential for pH electrode applications. pH electrodes present source impedances in the gigaohm range, and even picoampere-level bias currents can cause millivolt-scale errors, so 50pA maximum keeps measurement error within acceptable limits.
How does the 86dB CMRR of OPA131UG4 benefit industrial signal conditioning circuits exposed to ground noise?
With 86dB typical common-mode rejection ratio, the OPA131UG4 attenuates common-mode interference such as 50Hz or 60Hz power line noise by over 60,000:1. This makes it suitable for industrial sensors wired over long cable runs where common-mode noise can reach several volts.
When is OPA131UG4 preferred over bipolar-input op-amps for transimpedance amplifier designs?
OPA131UG4 is preferred over bipolar op-amps in transimpedance amplifiers when the photodiode or sensor presents high source impedance. Bipolar inputs typically have bias currents of several nanoamperes versus 50pA for OPA131UG4, so the FET input reduces the feedback resistor error current contribution by over 100x.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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