My Inquiry
My Account
Texas Instruments OPA4131UAG4
- Part No.:
- OPA4131UAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
OPA4131UAG4.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,880
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA4131UAG4 from Texas Instruments is a quad-channel, FET-input operational amplifier optimized for precision analog signal conditioning in multi-channel instrumentation systems. It delivers 4 MHz gain-bandwidth, 10 V/μs slew rate, ±4.5V to ±18V dual-supply operation, and ≤750 μV input offset voltage - enabling high-fidelity amplification in ECG front-ends and data acquisition channels.
For engineers reviewing the OPA4131UAG4 datasheet, OPA4131UAG4 pinout, OPA4131UAG4 application, or OPA4131UAG4 equivalent, key selection criteria include its quad SOIC-14 pinout compatibility, FET-input bias current (≤50 pA), rail-to-rail output swing capability, and proven stability driving capacitive loads up to 300 pF without phase reversal.
Technical Context
The OPA4131UAG4 implements a fully independent quad architecture with no crosstalk between channels, supporting simultaneous signal conditioning across four analog paths. Its FET-input stage enables ultra-low input bias current (5 pA typ at 25°C) and high input impedance (10¹² Ω || 4.3 pF), critical for high-impedance sensor interfaces like pH electrodes and piezoelectric transducers.
It features unity-gain stability, internal laser-trimmed offset voltage (±0.75 mV max), and robust common-mode rejection (≥70 dB over –12 V to +11.5 V), allowing direct use in single-ended and differential configurations without external compensation or trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | Quad - supports four independent amplification paths on one die, reducing board space and inter-channel mismatch in multi-sensor systems. |
| Input Bias Current | ≤50 pA max - preserves signal integrity from high-impedance sources (e.g., >1 MΩ sensors) without loading-induced error. |
| Input Offset Voltage | ≤750 μV max - ensures <0.1% gain error in 1 V full-scale instrumentation amplifiers without manual nulling. |
| Gain-Bandwidth Product | 4 MHz - supports stable closed-loop operation up to 100 kHz at G = 40, suitable for anti-aliasing and active filter stages. |
| Slew Rate | 10 V/μs - enables accurate reproduction of 1 Vpp signals up to ~1.6 MHz without slew-induced distortion. |
| Supply Voltage Range | ±4.5 V to ±18 V - accommodates industrial ±5 V, ±12 V, and ±15 V rails while maintaining specified performance. |
| Common-Mode Input Range | (V–) + 3 V to (V+) – 3.5 V - allows direct interfacing with 0–5 V or ±10 V sensor outputs using dual supplies. |
Pinout & Package
OPA4131UAG4 is packaged in a 14-pin SOIC (D package), surface-mount outline with standard industry pin spacing (1.27 mm pitch). The device uses a dual-supply configuration with shared V+ and V– pins for all four amplifiers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Output of channel A - drives downstream ADC driver or filter stage; capable of ±12 V swing into 2 kΩ load. |
| 2 | –IN A | Inverting input, channel A - accepts feedback network or inverting configuration signals; high-impedance FET node. |
| 3 | +IN A | Noninverting input, channel A - connects to high-Z sensor or reference; immune to phase reversal beyond CMR limits. |
| 4 | V+ | Positive supply rail - must be bypassed with ≥10 nF ceramic capacitor near pin to ensure stability and PSRR. |
| 5 | +IN B | Noninverting input, channel B - electrically isolated from other channels; identical specs to +IN A. |
| 6 | –IN B | Inverting input, channel B - supports independent feedback loop per channel; no inter-channel coupling. |
| 7 | OUT B | Output of channel B - operates independently; short-circuit protected (±20 mA max). |
| 8 | OUT C | Output of channel C - shares same thermal and supply environment as other outputs but no functional interaction. |
| 9 | –IN C | Inverting input, channel C - validated for operation across –40°C to +85°C ambient range. |
| 10 | +IN C | Noninverting input, channel C - maintains ≤10 μV/°C offset drift over full temperature range. |
| 11 | V– | Negative supply rail - referenced to system ground in single-supply configurations; requires local decoupling. |
| 12 | +IN D | Noninverting input, channel D - supports simultaneous 4-channel DAQ with matched dynamic performance. |
| 13 | –IN D | Inverting input, channel D - compatible with standard op-amp feedback topologies including transimpedance. |
| 14 | OUT D | Output of channel D - delivers full small-signal step response (2 μs to 0.01%) with 300 pF capacitive load. |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | Enables ≤50 pA input bias current - essential for low-leakage applications such as electrochemical sensors and photodiode transimpedance amps. |
| Laser-trimmed offset voltage | Guarantees ≤750 μV max input offset - eliminates need for external trim pots in medical-grade ECG and flow transmitter designs. |
| Capacitive load drive | Stable with up to 300 pF load - simplifies PCB layout by allowing direct connection to ADC input capacitance without isolation resistors. |
| No phase reversal | Prevents output polarity inversion when inputs exceed common-mode range - avoids catastrophic failure in closed-loop control circuits. |
| Independent quad topology | Zero crosstalk between channels - ensures simultaneous sampling accuracy in 4-channel data acquisition systems without timing skew or interference. |
Applications
| ECG Front-End Amplifier | Data Acquisition Channel |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from electrode pairs in portable ECG monitors. IC Role / Device Role / Timing Role: Primary instrumentation amplifier stage providing gain, filtering, and common-mode rejection before ADC digitization. Use Value: Ultra-low input bias current (≤50 pA) prevents electrode polarization errors; 750 μV max offset ensures baseline stability across patient movement and temperature shifts. |
Use Scenario: Simultaneous analog signal conditioning for four independent sensor inputs in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Quad-channel signal conditioner handling voltage, current, thermocouple, and RTD inputs within a single IC footprint. Use Value: Matched specifications across all four channels enable consistent gain, offset, and bandwidth - eliminating calibration per channel and reducing BOM count. |
| Flow Transmitter Signal Chain | Lab Instrumentation Preamp |
Use Scenario: Conditioning low-level differential output from Coriolis or magnetic flow sensors in process control systems. IC Role / Device Role / Timing Role: First-stage amplifier converting sensor mV-level output to robust 0–5 V or 4–20 mA interface levels. Use Value: Wide supply range (±4.5 V to ±18 V) supports legacy 24 V loop-powered designs; 4 MHz GBW enables fast response to transient flow events. |
Use Scenario: High-precision preamplification in benchtop multimeters, oscilloscope front-ends, and calibration equipment. IC Role / Device Role / Timing Role: Low-noise, low-drift gain block preceding programmable gain and ADC stages. Use Value: 15 nV/√Hz input voltage noise at 1 kHz and ≤10 μV/°C drift maintain measurement repeatability across environmental variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4131UA | Same silicon, SOIC-14 package, –40°C to +85°C temp grade, NIPDAUAG lead finish | Identical electrical specs; differs only in RoHS compliance and moisture sensitivity level (MSL-3 vs MSL-N/A) | Select OPA4131UA for RoHS-compliant production runs requiring standard reflow profiles. |
| OPA4132UA | Higher precision: 250 μV max offset, 5.5 MHz GBW, lower noise (12 nV/√Hz), but higher quiescent current (2.5 mA/ch) | Better suited for metrology-grade instruments where offset and noise dominate; not drop-in due to different supply current and thermal design needs | Choose OPA4132UA only when sub-μV offset and enhanced AC performance justify increased power and cost. |
Compared with OPA4131UAG4, OPA4131UA offers identical analog performance with RoHS-compliant packaging, while OPA4132UA trades higher power for improved DC accuracy and bandwidth - making OPA4131UAG4 optimal for cost-sensitive, multi-channel industrial DAQ where robustness and thermal stability are prioritized.
Availability
OPA4131UAG4 is available at Aetrix Electronics and suitable for ECG monitoring systems, industrial flow transmitters, lab instrumentation signal chains, and multi-channel data acquisition requiring stable component supply across extended product lifecycles.
Supply support for OPA4131UAG4 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 reliability.
The OPAx131 series was developed specifically for general-purpose, high-impedance analog signal conditioning in cost-sensitive instrumentation - balancing FET-input performance with manufacturability and long-term supply assurance.
FAQ
What is the operating temperature range for the OPA4131UAG4?
The OPA4131UAG4 is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in field-deployed instrumentation, flow meters, and portable medical devices exposed to variable environmental conditions. All key specifications - including input offset voltage, bias current, and gain-bandwidth - are guaranteed across this full range.
Does the OPA4131UAG4 require external offset nulling circuitry?
No, the OPA4131UAG4 does not require external offset nulling. Its input offset voltage is laser-trimmed at wafer test, guaranteeing ≤750 μV maximum across temperature. This eliminates the need for trim potentiometers or external DAC-based correction circuits in most precision applications, simplifying layout and improving long-term stability.
Can the OPA4131UAG4 drive capacitive loads without oscillation?
Yes, the OPA4131UAG4 is designed to drive capacitive loads up to 300 pF while maintaining stability and specified settling time (2 μs to 0.01%). Its internal compensation and robust phase margin prevent ringing or overshoot - a critical advantage when interfacing directly with ADC input capacitance or long PCB traces in data acquisition systems.
What is the maximum supply voltage for the OPA4131UAG4?
The OPA4131UAG4 supports a dual-supply range of ±4.5 V to ±18 V (or single-supply 9 V to 36 V). Absolute maximum ratings allow ±18 V, but recommended operating conditions specify ±15 V nominal for optimal performance. Exceeding ±18 V risks permanent damage per absolute maximum ratings.
Is the OPA4131UAG4 pin-compatible with other OPA4131 variants?
Yes, the OPA4131UAG4 shares the same 14-pin SOIC (D) package and pinout as OPA4131NA, OPA4131NJ, and OPA4131UA. All variants use identical pin functions per Table 4-3 - meaning PCB layouts designed for any 14-pin SOIC OPA4131 can accommodate OPA4131UAG4 without modification.
OPA4131UAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- 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 (x4 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:
- 16-SOIC
OPA4131UAG4 FAQ
1.How can I place an order for OPA4131UAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4131UAG4 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 OPA4131UAG4 reliable?
The price and inventory of OPA4131UAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4131UAG4 is usually 5 days.
3.What payment methods are accepted for OPA4131UAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4131UAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4131UAG4?
OPA4131UAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4131UAG4 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 OPA4131UAG4?
For technical support, including OPA4131UAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4131UAG4 requirements.
6.How does Aetrix verify that OPA4131UAG4 is sourced from the original manufacturer or authorized distributors?
All OPA4131UAG4 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 OPA4131UAG4 meets industry standards.
7.What is the process for return or replacement of OPA4131UAG4?
All OPA4131UAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4131UAG4, 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 OPA4131UAG4 part is unused and in its original packaging.
Return procedure for OPA4131UAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA4131UAG4 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
