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Texas Instruments OPA4131PJ
- Part No.:
- OPA4131PJ
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA4131PJ.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,304
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Product details
Overview
OPA4131PJ from Texas Instruments is a quad-channel, FET-input operational amplifier designed 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 OPA4131PJ datasheet, OPA4131PJ pinout, OPA4131PJ application, or OPA4131PJ equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options - all grounded in TI's SBOS040B production datasheet (July 2024 revision).
Technical Context
The OPA4131PJ implements fully independent amplifier channels in a single 14-pin PDIP package, with no crosstalk-induced performance degradation when one channel is overdriven or shorted. Its FET-input architecture ensures ultra-low input bias current (≤50 pA max) and high input impedance (10¹² Ω || 4.3 pF), critical for high-impedance sensor interfaces like flow transmitters and electrophysiological electrodes.
It is unity-gain stable, features no phase reversal under common-mode overvoltage conditions, and supports capacitive load drive up to 300 pF without oscillation - making it suitable for direct connection to ADC drivers and active filter stages without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 4 MHz gain-bandwidth product - enables stable closed-loop operation up to 100 kHz at G = 10. |
| Slew Rate | 10 V/μs - supports fast transient response in pulse-amplification and multiplexed DAQ systems. |
| Input Offset Voltage | ≤750 μV max - reduces DC error in precision gain stages without manual trimming. |
| Input Bias Current | ≤50 pA max at 25°C - preserves signal integrity from high-Z sources (e.g., pH electrodes, piezoelectric sensors). |
| Supply Range | ±4.5 V to ±18 V dual supply - accommodates industrial ±15 V rails and battery-powered ±5 V systems. |
| Common-Mode Range | (V–) + 3 V to (V+) – 3.5 V - allows rail-to-rail input operation within 3 V of either supply. |
| Quiescent Current | ±1.75 mA per amplifier - enables low-power multi-channel designs without thermal derating. |
Pinout & Package
OPA4131PJ uses a 14-pin plastic dual in-line package (PDIP-N), with through-hole mounting and industry-standard pin spacing (0.300" width). Thermal resistance RθJA is 80°C/W, supporting operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives downstream circuitry; capable of ±12 V swing into 2 kΩ. |
| 2 | –IN A | Inverting input, Channel A - accepts feedback or differential signals; high-impedance FET node. |
| 3 | +IN A | Noninverting input, Channel A - connects to high-Z sensors; CMRR ≥70 dB across full range. |
| 4 | V+ | Positive power supply - must be bypassed with ≥10 nF ceramic capacitor near pin. |
| 5 | +IN B | Noninverting input, Channel B - electrically isolated from other channels; identical specs to Pin 3. |
| 6 | –IN B | Inverting input, Channel B - independent bias path; no interaction with Channel A inputs. |
| 7 | OUT B | Amplifier B output - fully decoupled from OUT A; supports simultaneous multi-channel buffering. |
| 8 | OUT C | Amplifier C output - matches OUT A/B performance; usable for 3-phase signal conditioning. |
| 9 | –IN C | Inverting input, Channel C - shares same FET-input architecture and leakage spec as Pins 2 & 6. |
| 10 | +IN C | Noninverting input, Channel C - supports independent sensor interface per channel. |
| 11 | V– | Negative power supply - reference for all four amplifiers; requires local bypassing. |
| 12 | +IN D | Noninverting input, Channel D - completes quad-channel set; identical AC/DC specs to other +IN pins. |
| 13 | –IN D | Inverting input, Channel D - no internal coupling to other channels; validated for independent use. |
| 14 | OUT D | Amplifier D output - rated for same output swing and load drive as OUT A–C. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal on CM overvoltage | Prevents catastrophic control-loop failure in voltage-follower configurations used in lab instrumentation. |
| Laser-trimmed input offset | Eliminates need for external nulling circuits in ECG and DAQ front-ends, reducing BOM count and layout area. |
| Unity-gain stability | Enables direct use in buffer, integrator, and active filter topologies without external compensation components. |
| Independent channel operation | Guarantees no performance shift in remaining channels if one amplifier is shorted or saturated - critical for fault-tolerant designs. |
| Capacitive load drive | Stable with ≥300 pF loads - simplifies routing to ADC inputs or long PCB traces without isolation resistors. |
Applications
| ECG Signal Conditioning | Data Acquisition Front-End |
|---|---|
|
Use Scenario: Amplifying low-amplitude, high-impedance biopotential signals from patient electrodes with minimal noise and DC drift. IC Role / Device Role / Timing Role: Quad-channel instrumentation amplifier stage - each OPA4131PJ channel buffers and gains one lead (I, II, III, aVR) before multiplexing. Use Value: ≤750 μV offset and ≤10 μV/°C drift ensure baseline stability across body temperature variations; FET inputs prevent electrode polarization errors. |
Use Scenario: Simultaneous analog signal conditioning for multi-sensor industrial monitoring (pressure, temperature, flow). IC Role / Device Role / Timing Role: Four independent precision gain blocks - each channel conditions one sensor output prior to ADC sampling. Use Value: 4 MHz bandwidth supports >100 kSPS sampling rates; 10 V/μs slew rate prevents distortion on fast transients from flow meters. |
| Lab Instrumentation Amplifier | Flow Transmitter Analog Stage |
|
Use Scenario: Building modular, calibrated test equipment such as programmable gain amplifiers and active filters. IC Role / Device Role / Timing Role: Core amplification element in reconfigurable analog signal paths - configured as inverting/noninverting amps, integrators, or differentiators. Use Value: Unity-gain stability and absence of phase reversal allow safe use in feedback loops without risk of latch-up during setup or overload. |
Use Scenario: Converting low-level current outputs (4–20 mA) from Coriolis or magnetic flow sensors into buffered voltage signals. IC Role / Device Role / Timing Role: Precision I-to-V converter and output driver - one channel handles sensor current conversion, others condition auxiliary signals (temp, density). Use Value: ≤50 pA input bias current avoids loading high-resistance shunt networks; wide supply range supports 24 V loop-powered designs. |
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 |
|---|---|---|---|
| OPA4132UA | Lower input offset (150 μV max), higher GBW (8 MHz), but narrower supply range (±2.25 V to ±18 V); SOIC-14 only. | Better for high-speed, low-offset DAQ; not suitable for ±4.5 V minimum supply systems. | Select OPA4132UA only if offset <200 μV and bandwidth >5 MHz are required - verify supply compatibility. |
| TL074CP | Higher input bias (200 pA typ), larger offset (10 mV max), lower GBW (3 MHz); same PDIP-14 footprint and pinout. | Acceptable for cost-sensitive, non-precision applications where FET input is secondary to package compatibility. | Choose TL074CP only for legacy board reuse where OPA4131PJ's precision is unnecessary - expect reduced DC accuracy. |
Compared with OPA4131PJ, OPA4132UA offers superior AC/DC performance but sacrifices low-voltage operability, while TL074CP retains mechanical compatibility at the cost of 13× higher offset and 40× higher input bias - making OPA4131PJ the optimal balance for general-purpose precision quad amplification.
Availability
OPA4131PJ is available at Aetrix Electronics and suitable for electrocardiogram (ECG) systems, industrial data acquisition (DAQ), and lab instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.
Supply support for OPA4131PJ 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 50 years of op amp innovation and broad manufacturing scale.
The OPAx131 series was engineered for cost-effective, high-performance general-purpose amplification - targeting instrumentation, medical, and industrial signal chains where FET input, low offset, and robust capacitive load drive are essential.
FAQ
What is the maximum operating temperature for the OPA4131PJ?
The OPA4131PJ is rated for an ambient operating temperature range of –40°C to +85°C, as confirmed in Section 5.2 of the TI SBOS040B datasheet. Its PDIP package exhibits a junction-to-ambient thermal resistance (RθJA) of 80°C/W, allowing reliable operation at full rated load within this range without forced cooling.
Does the OPA4131PJ require external offset nulling?
No, the OPA4131PJ does not require external offset nulling. Its input offset voltage is laser-trimmed to ≤750 μV maximum across temperature, and its drift is specified at ≤10 μV/°C - sufficient for most precision applications including ECG and DAQ front-ends without user adjustment.
Can the OPA4131PJ drive a 1000-pF capacitive load?
The OPA4131PJ is characterized for stable operation with up to 300 pF capacitive loads (Figure 5-15). Driving 1000 pF may cause peaking or oscillation; for heavier loads, add a series isolation resistor (e.g., 20–50 Ω) between the output and capacitance - verified in typical application guidelines of the OPA4131PJ datasheet.
Is the OPA4131PJ pin-compatible with the TL074CP?
Yes, the OPA4131PJ and TL074CP share identical 14-pin PDIP footprints and pin assignments (per Table 4-3 and TI's package drawings), enabling drop-in replacement in existing layouts - though electrical performance differences (offset, bias current, bandwidth) must be validated in the target application.
What is the recommended power supply bypassing for OPA4131PJ?
Texas Instruments recommends bypassing both V+ (Pin 4) and V– (Pin 11) with ≥10 nF ceramic capacitors placed as close as possible to the respective pins. This minimizes high-frequency noise coupling and ensures stability, especially in multi-channel configurations where shared supply impedance could induce crosstalk.
OPA4131PJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 1.5 mV
- 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:
- Through Hole
- Supplier Device Package:
- 14-PDIP
OPA4131PJ FAQ
1.How can I place an order for OPA4131PJ through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4131PJ 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 OPA4131PJ reliable?
The price and inventory of OPA4131PJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4131PJ is usually 5 days.
3.What payment methods are accepted for OPA4131PJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4131PJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4131PJ?
OPA4131PJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4131PJ 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 OPA4131PJ?
For technical support, including OPA4131PJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4131PJ requirements.
6.How does Aetrix verify that OPA4131PJ is sourced from the original manufacturer or authorized distributors?
All OPA4131PJ 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 OPA4131PJ meets industry standards.
7.What is the process for return or replacement of OPA4131PJ?
All OPA4131PJ units undergo pre-shipment inspection (PSI). If there is an issue with OPA4131PJ, 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 OPA4131PJ part is unused and in its original packaging.
Return procedure for OPA4131PJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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