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Texas Instruments OPA4131PA
- Part No.:
- OPA4131PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA4131PA.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,830
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Product details
Overview
OPA4131PA from Texas Instruments is a quad-channel, FET-input operational amplifier optimized for precision analog signal conditioning in low-noise, high-impedance sensor interfaces and instrumentation systems. It delivers 750 μV max input offset voltage, 50 pA max input bias current, 4 MHz gain bandwidth, 10 V/μs slew rate, and operates from ±4.5 V to ±18 V supplies - enabling stable performance in ECG front-ends and flow transmitter signal chains.
For engineers reviewing the OPA4131PA datasheet, OPA4131PA pinout, OPA4131PA application, or OPA4131PA equivalent, key selection considerations include its quad-channel PDIP-14 package, rail-to-rail output swing limitations (±2.5 V from rails), unity-gain stability, absence of phase reversal under overvoltage, and compatibility with capacitive loads up to 300 pF without external compensation.
Technical Context
The OPA4131PA implements a fully independent quad-amplifier architecture with laser-trimmed input offset voltage and low-drift design (±2–10 μV/°C), ensuring channel-to-channel isolation and predictable behavior when one amplifier is overdriven or shorted. 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 common-mode), critical for photodiode transimpedance and piezoelectric sensor amplification.
It features internal frequency compensation for unity-gain stability, supports dual-supply operation down to ±4.5 V, and maintains 94–110 dB open-loop gain across temperature. The device exhibits no output phase reversal when common-mode voltage exceeds specified limits - a known failure mode in legacy FET op amps - making it suitable for voltage-follower configurations in closed-loop control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±750 μV max - ensures ≤0.75 mV DC error in precision DC-coupled gain stages without trimming. |
| Input Bias Current | ±50 pA max - enables use with >1 GΩ source impedances (e.g., pH electrodes, piezoelectric sensors) without significant voltage error. |
| Gain Bandwidth Product | 4 MHz - supports stable closed-loop gains up to ~40 at 100 kHz, sufficient for anti-aliasing and active filter designs. |
| Slew Rate | 10 V/μs - allows full-scale 10 V output transitions in ≤1 μs, suitable for medium-speed data acquisition sampling. |
| Supply Voltage Range | ±4.5 V to ±18 V - accommodates industrial ±5 V, ±12 V, and ±15 V supply rails without external regulation. |
| Common-Mode Input Range | (V−) + 3 V to (V+) − 3.5 V - requires ≥3 V headroom from each rail, limiting use in single-supply <5 V systems. |
| Output Voltage Swing | ≥±2.5 V into 2 kΩ - delivers >4.5 Vpp linear output with ±15 V supplies, compatible with 12-bit ADC reference ranges. |
Pinout & Package
OPA4131PA is supplied in a 14-pin plastic dual in-line package (PDIP-N), through-hole mountable, RoHS-compliant, with no internal connection on pins 8 and 9. Thermal resistance RθJA = 80 °C/W enables operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load; capable of ±20 mA short-circuit current. |
| 2 | −IN A | Inverting input, channel A - high-impedance FET node; bias current ≤50 pA. |
| 3 | +IN A | Noninverting input, channel A - same impedance and bias characteristics as −IN A. |
| 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 +IN A. |
| 6 | −IN B | Inverting input, channel B - independent bias path; no crosstalk with channel A. |
| 7 | OUT B | Amplifier B output - fully decoupled; can drive separate signal chain without interaction. |
| 8 | NC | No internal connection - must be left floating; not tied to substrate or ground. |
| 9 | NC | No internal connection - must be left floating; unused in PDIP-14 configuration. |
| 10 | +IN C | Noninverting input, channel C - matches channel A/B electrical behavior and layout symmetry. |
| 11 | V− | Negative power supply - shared return for all four amplifiers; requires local bypassing. |
| 12 | +IN D | Noninverting input, channel D - completes quad set; pin-compatible with SOIC-14 and SOIC-16 variants. |
| 13 | −IN D | Inverting input, channel D - supports independent feedback networks per channel. |
| 14 | OUT D | Amplifier D output - enables simultaneous 4-channel signal conditioning on single IC. |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | Enables ≤50 pA input bias current and ≥1 TΩ input resistance - essential for high-Z sensor interfacing without loading errors. |
| Laser-trimmed offset | Guarantees ±750 μV max VOS and ±10 μV/°C max drift - eliminates need for external nulling circuitry in production-grade instrumentation. |
| Unity-gain stable | Operates reliably with gain = 1 without external compensation - simplifies design of buffers, followers, and active filters. |
| No phase reversal | Prevents catastrophic output inversion when input exceeds common-mode range - critical for safety-critical monitoring circuits like ECG. |
| Capacitive load drive | Stable with ≥300 pF load capacitance - supports direct driving of ADC input capacitors and long PCB traces without ringing. |
Applications
| ECG Signal Conditioning | Flow Transmitter Amplification |
|---|---|
|
Use Scenario: Amplifying microvolt-level biopotential signals from electrode pairs in portable or bedside electrocardiogram systems. IC Role / Device Role / Timing Role: Quad-channel instrumentation amplifier front-end: two channels for differential lead I/II acquisition, one for right-leg drive (RLD), one for reference buffer. Use Value: Ultra-low input bias current prevents electrode polarization error; low offset and drift ensure baseline stability over time and temperature. |
Use Scenario: Converting low-level current outputs (4–20 mA) from Coriolis or magnetic flow meters into calibrated voltage signals for PLC or DCS inputs. IC Role / Device Role / Timing Role: Precision I-to-V conversion and filtering: one channel as transimpedance amplifier, others for gain, offset correction, and low-pass filtering. Use Value: 4 MHz bandwidth supports fast flow transient response; excellent CMRR (>70 dB) rejects common-mode noise from industrial motor drives. |
| Data Acquisition Front-End | Lab Instrumentation Buffering |
|
Use Scenario: Signal conditioning stage in 16-bit+ multichannel DAQ modules used in test benches and environmental monitoring. IC Role / Device Role / Timing Role: Quad-channel programmable-gain amplifier (PGA) core: each channel handles one sensor input with selectable gain (1×, 10×, 100×) via external resistors. Use Value: 10 V/μs slew rate supports ≥100 kSPS sampling; low THD+N (0.0008%) preserves dynamic range for high-resolution digitization. |
Use Scenario: Output buffering and level-shifting in benchtop oscilloscopes, function generators, and spectrum analyzers requiring low-distortion signal routing. IC Role / Device Role / Timing Role: Unity-gain voltage follower per channel: isolating sensitive DAC outputs, driving coaxial cables, and maintaining signal integrity across multiple instrument sections. Use Value: No phase reversal ensures safe operation during user-induced overvoltage events; 110 dB open-loop gain guarantees <0.001% gain error in buffered configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad FET-input operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4132UA | Lower input bias current (1 pA typ), higher GBW (8 MHz), higher quiescent current (2.2 mA/ch), SOIC-14 only. | Better for ultra-high-Z sources (e.g., electrophysiology) and higher-frequency filtering; not available in PDIP. | Select OPA4132UA when >4 MHz bandwidth or sub-5 pA bias is required; avoid if PDIP mounting or <2 mA/ch power budget is mandatory. |
| TL074CP | Higher input bias current (200 pA typ), lower GBW (3 MHz), lower cost, same PDIP-14 package and pinout. | Suitable for non-critical audio and general-purpose analog; lacks guaranteed phase-reversal immunity and laser trimming. | Choose TL074CP for cost-sensitive, non-medical, non-precision applications where ±5 mV offset and 200 pA bias are acceptable. |
Compared with OPA4131PA, OPA4132UA offers superior bandwidth and bias current but sacrifices PDIP availability and increases power draw, while TL074CP provides pin-compatible legacy support at lower precision and reliability - making OPA4131PA the optimal balance of performance, package flexibility, and proven robustness in medical and industrial instrumentation.
Availability
OPA4131PA is available at Aetrix Electronics and suitable for ECG signal conditioning, flow transmitter amplification, and data acquisition front-end designs requiring stable component supply, long-term manufacturability, and through-hole assembly compatibility.
Supply support for OPA4131PA 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 heritage in precision op amp design and manufacturing excellence.
The OPAx131 family was engineered specifically for cost-sensitive, high-accuracy analog signal conditioning in medical, industrial, and test equipment - delivering FET-input performance without premium pricing or complex layout requirements.
FAQ
What is the maximum operating temperature for the OPA4131PA?
The OPA4131PA is rated for operation from –40°C to +85°C ambient temperature. Its PDIP package has a junction-to-ambient thermal resistance (RθJA) of 80°C/W, so at 25°C ambient and 4 × 1.75 mA quiescent current (7 mA total), junction temperature rise is ~560 mW × 80°C/W = 45°C - well within the 150°C absolute max limit. Derating is recommended above 70°C ambient.
Does the OPA4131PA require external compensation for unity-gain stability?
No, the OPA4131PA is internally compensated for unity-gain stability. It can be configured as a voltage follower (gain = +1) without external capacitors or resistors. This is confirmed in Section 6.1 of the datasheet, which states "The OPAx131 series op amps are unity-gain stable" and recommends only power-supply bypassing with ≥10 nF ceramics.
Can the OPA4131PA drive capacitive loads without oscillation?
Yes - the OPA4131PA is characterized for stable operation with ≥300 pF capacitive loads, as shown in Figure 5-15 (Small-Signal Overshoot vs Load Capacitance). This capability supports direct driving of ADC input capacitors, long cables, and multi-stage filter nodes without added isolation resistors or compensation networks.
What is the input common-mode voltage range of the OPA4131PA?
The OPA4131PA specifies an input common-mode voltage range of (V−) + 3 V to (V+) − 3.5 V. For example, with ±15 V supplies, inputs must stay between –12 V and +11.5 V. This limitation arises from its JFET input stage and excludes rail-to-rail input capability - unlike newer CMOS-input op amps.
Is the OPA4131PA pin-compatible with other quad op amps in PDIP-14 packages?
Yes - the OPA4131PA uses the industry-standard 14-pin PDIP pinout defined for quad op amps (e.g., TL074, LM324, NE5532). Pin 1 = OUT A, Pin 2 = −IN A, Pin 3 = +IN A, Pin 4 = V+, Pin 5 = +IN B, Pin 6 = −IN B, Pin 7 = OUT B, Pins 8–9 = NC, Pin 10 = +IN C, Pin 11 = V−, Pin 12 = +IN D, Pin 13 = −IN D, Pin 14 = OUT D.
OPA4131PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 14-PDIP
OPA4131PA FAQ
1.How can I place an order for OPA4131PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4131PA 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 OPA4131PA reliable?
The price and inventory of OPA4131PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4131PA is usually 5 days.
3.What payment methods are accepted for OPA4131PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4131PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4131PA?
OPA4131PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4131PA 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 OPA4131PA?
For technical support, including OPA4131PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4131PA requirements.
6.How does Aetrix verify that OPA4131PA is sourced from the original manufacturer or authorized distributors?
All OPA4131PA 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 OPA4131PA meets industry standards.
7.What is the process for return or replacement of OPA4131PA?
All OPA4131PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA4131PA, 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 OPA4131PA part is unused and in its original packaging.
Return procedure for OPA4131PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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