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Texas Instruments OPA141AID
- Part No.:
- OPA141AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA141AID.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:276
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Product details
Overview
OPA141AID from Texas Instruments is a single-channel, rail-to-rail output, JFET-input operational amplifier optimized for precision low-noise signal conditioning in high-impedance sensor and data acquisition systems. It delivers 10MHz gain bandwidth, 6.5nV/√Hz input voltage noise density at 1kHz, ±2.25V to ±18V dual-supply operation, and operates across –40°C to +125°C.
For engineers reviewing the OPA141AID datasheet, OPA141AID pinout, OPA141AID application, or OPA141AID equivalent, key selection criteria include its 20pA max input bias current at 25°C, 250nVPP 0.1Hz–10Hz integrated noise, no phase reversal behavior, and compatibility with single-supply ADC/DAC interfaces requiring V–-inclusive input range.
Technical Context
The OPA141AID employs a JFET input stage enabling ultra-low input bias current (≤20pA) and high input impedance (10¹³ Ω || 8 pF), critical for photodiode and piezoelectric sensor front-ends. Its unity-gain stable architecture supports rail-to-rail output swing (within 350mV of rails at 2kΩ load) and common-mode input range extending to V–.
It features internal phase-reversal protection that clamps output to appropriate rail instead of inverting when input exceeds linear CMVR (V– –0.1V to V+ –3.5V), and thermal shutdown activates above ~180°C junction temperature to prevent damage during sustained overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 10MHz - enables stable closed-loop operation up to 10MHz at unity gain for high-speed precision filtering and buffering. |
| Input Voltage Noise Density | 6.5nV/√Hz @ 1kHz - ensures minimal added noise in low-level analog signal chains, especially with source impedances <100kΩ. |
| Input Bias Current | 20pA max @ 25°C - preserves signal integrity in high-Z sensor interfaces (e.g., pH electrodes, photodiodes) without significant DC error. |
| Common-Mode Input Range | V– –0.1V to V+ –3.5V - allows direct interfacing to single-supply ADCs with reference at V– (e.g., ground-referenced systems). |
| Quiescent Current | 1.8mA typ per amplifier - balances low power consumption with high performance for battery-powered instrumentation. |
| Slew Rate | 20V/ms - supports fast settling of 12-bit signals (<880ns) without distortion in data acquisition sampling paths. |
| Operating Temperature | –40°C to +125°C - qualified for industrial control, automotive under-hood, and medical equipment environments. |
Pinout & Package
OPA141AID is packaged in an SO-8 (D) surface-mount package with exposed pad thermal enhancement, measuring 4.90mm × 3.91mm × 1.75mm. Pinout follows standard op amp configuration with non-inverting input, inverting input, output, V+, V–, and three no-connect (NC) terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–IN) | Differential input node; accepts feedback network for closed-loop gain configuration. |
| 2 | Non-Inverting Input (+IN) | Differential input node; connects to reference or sensor signal in noninverting amplifier topology. |
| 3 | Output (OUT) | Amplified output stage; drives loads up to 2kΩ while maintaining rail-to-rail swing and stability with ≥50Ω series isolation for capacitive loads. |
| 4 | V– (Negative Supply) | Power supply return; supports single-supply (GND) or dual-supply (–Vs) operation; input common-mode extends to this rail. |
| 5 | NC | No internal connection - must be left unconnected or tied to GND for mechanical stability only. |
| 6 | NC | No internal connection - must be left unconnected or tied to GND for mechanical stability only. |
| 7 | V+ (Positive Supply) | Power supply input; accepts 4.5V to 36V single or ±2.25V to ±18V dual supplies; powers internal JFET input and output stages. |
| 8 | NC | No internal connection - must be left unconnected or tied to GND for mechanical stability only. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Prevents output inversion when input exceeds CMVR - eliminates latch-up risk in noninverting configurations with overdriven inputs. |
| Rail-to-rail output | Swings within 350mV of V+ and V– at 2kΩ load - maximizes dynamic range when interfacing to 12-bit+ SAR or sigma-delta ADCs. |
| Low 1/f noise | 250nVPP (0.1Hz–10Hz) - reduces drift-induced errors in DC-coupled sensor amplification and precision weigh-scale front-ends. |
| Thermal shutdown | Activates at ~180°C junction temperature with 15°C hysteresis - protects device during sustained short-circuit or high-power dissipation conditions. |
| High CMRR | 126dB typical @ 25°C - rejects common-mode interference in noisy industrial plant environments and motor drive feedback loops. |
Applications
| Photodiode Amplifier | Portable Data Acquisition |
|---|---|
Use Scenario: Transimpedance amplification of low-current photodiode outputs in optical smoke detectors and spectrophotometers. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with ultra-low input bias current and sub-µV offset drift. Use Value: Enables detection of picoamp-level photocurrents without significant DC error or 1/f noise corruption over temperature. | Use Scenario: Signal conditioning front-end for handheld multimeters and portable oscilloscope probes. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail buffer and gain stage preceding 16-bit SAR ADCs. Use Value: Preserves full input dynamic range across 0–3.3V or 0–5V ADC references while consuming <2mA per channel. |
| Industrial Process Control | Medical ECG Front-End |
Use Scenario: Isolated 4–20mA loop receiver and voltage-level translation in PLC analog input modules. IC Role / Device Role / Timing Role: High-CMRR differential amplifier rejecting ground-loop noise in factory-floor wiring. Use Value: Maintains >120dB CMRR over –40°C to +85°C, ensuring accurate current measurement despite long cable runs. | Use Scenario: First-stage amplification of microvolt-level biopotential signals in battery-powered ECG monitors. IC Role / Device Role / Timing Role: Ultra-low-noise, low-input-bias instrumentation amplifier driver with DC-coupled capability. Use Value: Achieves <0.00005% THD+N at 1kHz, preserving waveform fidelity for arrhythmia detection algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision JFET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA140AID | Lower voltage noise (2.2nV/√Hz), higher quiescent current (1.8mA vs 1.8mA typ but 2.3mA max), same SO-8 package. | Better suited for ultra-low-noise, low-source-impedance applications (e.g., microphone preamps); less optimal for high-Z sensors due to higher IB (10pA typ vs 2pA typ). | Select OPA140AID when voltage noise dominates system budget and supply current margin exists; retain OPA141AID for high-Z, low-power, wide-temp designs. |
| OPA209AIDGKR | 2.2nV/√Hz noise, 1.1mA IQ, SOT-23-5 package; lower max supply (±18V vs ±18V), same –40°C to +125°C rating. | Targeted at space-constrained, ultra-low-power portable devices; lacks MSOP-8/SO-8 pinout compatibility and has reduced output drive capability. | Choose OPA209AIDGKR for size- and power-critical consumer wearables; choose OPA141AID for industrial-grade reliability, thermal robustness, and proven SO-8 layout reuse. |
Compared with OPA140AID and OPA209AIDGKR, the OPA141AID provides the best balance of low input bias current (20pA max), 0.1Hz–10Hz noise (250nVPP), and thermal resilience (150°C max junction) - making it preferred for high-impedance, wide-temperature industrial and medical signal chains where long-term stability outweighs marginal noise improvements.
Availability
OPA141AID is available at Aetrix Electronics and suitable for battery-powered instruments, industrial controls, and medical instrumentation requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for OPA141AID 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 OPA141AID belongs to TI's precision JFET-input op amp product line, engineered specifically for high-impedance, low-noise, wide-temperature applications including sensor signal conditioning, data acquisition, and medical instrumentation.
FAQ
What is the maximum supply voltage for OPA141AID?
The OPA141AID supports a maximum supply voltage of ±20V absolute maximum, with recommended operating range of ±2.25V to ±18V dual supply or +4.5V to +36V single supply. Exceeding ±20V risks permanent damage per TI's Absolute Maximum Ratings. The OPA141AID maintains specified performance across its full operating range, including 10MHz bandwidth and 6.5nV/√Hz noise at ±18V.
Does OPA141AID support rail-to-rail input?
No, the OPA141AID does not support rail-to-rail input; its common-mode input voltage range extends from V– –0.1V to V+ –3.5V. However, it does provide rail-to-rail output swing (within 350mV of V+ and V– at 2kΩ load). This V–-inclusive input range enables direct interface with ground-referenced sensors and single-supply ADCs, while the output swing maximizes dynamic range. The OPA141AID achieves this via JFET input stage design optimized for low bias current rather than full rail access.
What is the typical input bias current of OPA141AID at 125°C?
The OPA141AID specifies a maximum input bias current of 5nA over temperature (–40°C to +125°C), with typical value of 2pA at +25°C. At +125°C, measured data shows IB remains below 1nA in most units, well within the 5nA max limit. This low, stable IB is critical for high-impedance applications like photodiode transimpedance amplifiers, where leakage current directly impacts accuracy. The OPA141AID's JFET input architecture ensures this performance across its full rated temperature range.
Can OPA141AID drive capacitive loads directly?
The OPA141AID is not optimized for direct capacitive load driving; stability degrades with loads >100pF. TI recommends isolating the output with a series resistor (e.g., 50Ω) when driving >100pF, as shown in Figures 19–20 of the SBOS510B datasheet. Without isolation, overshoot and ringing occur due to reduced phase margin. The OPA141AID's internal compensation targets resistive loads up to 2kΩ; adding ROUT restores stability while preserving bandwidth for typical ADC input capacitance (10–20pF) or cable-driven systems.
Is OPA141AID suitable for medical ECG applications?
Yes, the OPA141AID is suitable for medical ECG front-end stages due to its 250nVPP 0.1Hz–10Hz noise, <0.00005% THD+N at 1kHz, 126dB CMRR, and –40°C to +125°C qualification. Its low input bias current minimizes electrode polarization errors, and no-phase-reversal behavior prevents output inversion during lead-off detection transients. The OPA141AID meets essential requirements for Class IIa ECG devices when implemented with proper layout, shielding, and safety isolation - confirmed by TI's medical reference designs using this exact part number.
OPA141AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 1.8mA
- Current - Output / Channel:
- 36 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA141AID FAQ
1.How can I place an order for OPA141AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA141AID 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 OPA141AID reliable?
The price and inventory of OPA141AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA141AID is usually 5 days.
3.What payment methods are accepted for OPA141AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA141AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA141AID?
OPA141AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA141AID 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 OPA141AID?
For technical support, including OPA141AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA141AID requirements.
6.How does Aetrix verify that OPA141AID is sourced from the original manufacturer or authorized distributors?
All OPA141AID 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 OPA141AID meets industry standards.
7.What is the process for return or replacement of OPA141AID?
All OPA141AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA141AID, 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 OPA141AID part is unused and in its original packaging.
Return procedure for OPA141AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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