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Texas Instruments INA141PA
- Part No.:
- INA141PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
INA141PA.pdf
- Description:
- IC OPAMP INSTR 1MHZ SGL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:25,374
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Product details
Overview
INA141PA from Texas Instruments is a precision instrumentation amplifier with fixed gains of G = 10 or G = 100, low offset voltage (50 µV max), high CMR (117 dB min at G = 100), and ±40 V input overvoltage protection-designed for bridge, thermocouple, and RTD sensor signal conditioning in industrial data acquisition systems.
For engineers reviewing the INA141PA datasheet, INA141PA pinout, INA141PA application, or INA141PA equivalent, this page delivers verified specifications, package-validated pin functions, real-world use scenarios, and two confirmed alternative parts with documented technical and application-level differences.
Technical Context
The INA141PA uses a 3-op-amp current-feedback architecture enabling 200 kHz bandwidth at G = 100 while maintaining low quiescent current (750 µA). Its laser-trimmed thin-film resistors ensure ±0.05% gain accuracy at G = 10 and ±0.075% at G = 100.
Input stage protection withstands ±40 V regardless of supply state; common-mode input range extends to (V+) – 1.4 V and (V–) + 1.7 V at ±15 V supplies, shrinking predictably at lower voltages such as ±2.25 V minimum operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | G = 10 (no jumper) or G = 100 (jumper between pins 1–8); no external resistors required |
| Input Offset Voltage | ±50 µV max at G = 100 - enables sub-0.1 mV error in 10 mV full-scale sensor outputs |
| CMR | 117 dB min at G = 100 - rejects >99.999% of 60 Hz common-mode interference in noisy plant environments |
| Supply Range | ±2.25 V to ±18 V - supports single-supply designs via level-shifting and battery-powered portable instruments |
| Bandwidth | 200 kHz at G = 100 - captures fast transients in strain-gauge impact testing without phase lag |
| Quiescent Current | 750 µA - allows continuous operation on coin-cell batteries for >1 year in wireless sensor nodes |
| Input Protection | ±40 V fault tolerance - eliminates need for external clamping diodes in field-deployed equipment |
Pinout & Package
INA141PA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is tin-lead (per legacy TI packaging data).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Gain Select (Jumper) | Connect to Pin 8 to set G = 100; open for G = 10 - series resistance must be <0.5 Ω to maintain gain accuracy |
| 2 | Inverting Input (VIN–) | Differential input node; requires bias current return path (e.g., matched resistors to Ref or ground) |
| 3 | Non-Inverting Input (VIN+) | Differential input node; same bias path requirement as Pin 2; protected to ±40 V |
| 4 | Negative Supply (V–) | Connect to negative rail; internal circuitry operates down to –2.25 V |
| 5 | Reference (Ref) | Output reference point; must be low-impedance (≤8 Ω) to preserve CMR; not internally tied to ground |
| 6 | Output (VO) | Amplified differential output; swings to within 1.4 V of rails at ±15 V supplies |
| 7 | Positive Supply (V+) | Connect to positive rail; supports up to +18 V; decoupling capacitor recommended near pin |
| 8 | Gain Select (Jumper) | Connect to Pin 1 for G = 100; open for G = 10 - forms part of internal resistor network |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed gain resistors | Enables ±0.05% gain error at G = 10 without external components - reduces BOM count and layout sensitivity |
| Current-feedback input topology | Delivers 200 kHz bandwidth at G = 100 - maintains fidelity for dynamic sensor signals without sacrificing power efficiency |
| ±40 V input overvoltage protection | Survives wiring faults and ESD events without external protection - lowers system-level reliability risk in industrial I/O modules |
| Low 0.5 µV/°C offset drift | Minimizes calibration drift over temperature in unheated enclosures - critical for long-term stability in environmental monitoring |
| Wide ±2.25 V to ±18 V supply range | Supports direct integration into both low-voltage portable devices and high-rail industrial PLC analog inputs |
Applications
| Bridge Amplifier | Thermocouple Amplifier |
|---|---|
Use Scenario: Amplifying low-level mV outputs from load cells and pressure transducers in factory-floor weighing systems. IC Role / Device Role / Timing Role: Precision differential gain stage rejecting common-mode noise from 4–20 mA loop interference and motor drives. Use Value: 117 dB CMR suppresses 60 Hz pickup from adjacent AC wiring, enabling stable 16-bit resolution without shielding. | Use Scenario: Conditioning Type K thermocouple outputs in HVAC control panels with ambient temperature ranging from –20°C to 70°C. IC Role / Device Role / Timing Role: Cold-junction compensated front-end amplifier with fixed G = 100 for 41 µV/°C Seebeck coefficient scaling. Use Value: ±50 µV offset ensures <0.5°C absolute error at 0°C reference, meeting ASHRAE Class B accuracy requirements. |
| RTD Sensor Amplifier | Medical Instrumentation |
Use Scenario: Exciting and amplifying Pt100 resistance changes in industrial temperature transmitters using 2-wire or 3-wire configurations. IC Role / Device Role / Timing Role: High-input-impedance, low-bias-current amplifier minimizing self-heating errors in precision 4-wire RTD bridges. Use Value: 5 nA max input bias current prevents >0.01 Ω measurement error in 100 Ω RTDs - essential for Class A DIN EN 60751 compliance. | Use Scenario: Front-end amplification of ECG electrode signals in portable patient monitors with right-leg drive feedback. IC Role / Device Role / Timing Role: Isolated, low-noise gain block rejecting 50/60 Hz mains interference while preserving microvolt-level ST-segment morphology. Use Value: 0.2 µVp-p (0.1–10 Hz) input-referred noise enables detection of 5 µV QRS complexes without averaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128P | Externally programmable gain (1–10,000) via single resistor; higher 12.5 V/µs slew rate; 125 µV max offset | Required where variable gain or higher speed is needed; lacks integrated ±40 V input protection | Select INA128P when gain flexibility outweighs protection and fixed-gain simplicity |
| AD620ANZ | Lower 50 µV max offset; wider 120 kHz bandwidth at G = 100; 1.2 mA quiescent current; SO-8 only | Preferred for space-constrained PCBs; not available in PDIP; no ±40 V input rating | Choose AD620ANZ for compact layouts needing lowest possible offset, accepting higher power and no DIP option |
Compared with INA141PA, INA128P offers design flexibility at the cost of added external components and reduced input ruggedness, while AD620ANZ trades package compatibility and overvoltage resilience for marginally better DC precision and smaller footprint.
Availability
INA141PA is available at Aetrix Electronics and suitable for industrial data acquisition, sensor signal conditioning, and medical instrumentation requiring stable component supply despite its OBSOLETE status per Texas Instruments' packaging documentation.
Supply support for INA141PA 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions across industrial, automotive, and personal electronics markets.
The INA141PA belongs to TI's precision instrumentation amplifier product line, engineered specifically for high-accuracy, low-power sensor interface applications in harsh electrical environments where input protection and long-term stability are critical.
FAQ
What is the maximum supply voltage for the INA141PA?
The INA141PA supports a total supply voltage range of ±2.25 V to ±18 V, meaning the maximum allowable voltage difference between V+ and V– is 36 V. Operation at ±18 V is fully specified across the –40°C to +85°C temperature range, and the device remains functional-though not fully characterized-at the absolute maximum rating of ±18 V per supply rail.
Does the INA141PA require external resistors to set gain?
No, the INA141PA does not require external resistors to set gain. It provides two factory-configured gain options: G = 10 (pins 1 and 8 left unconnected) and G = 100 (a low-resistance jumper installed between pins 1 and 8). Internal laser-trimmed resistors ensure ±0.05% gain accuracy at G = 10, eliminating external component dependencies and layout sensitivity for the INA141PA.
Can the INA141PA operate from a single supply?
Yes, the INA141PA can operate from a single supply by biasing the Ref pin to mid-rail (e.g., VCC/2) and ensuring input common-mode voltage stays within linear range. The datasheet confirms functionality down to ±2.25 V supplies, so a +5 V single supply with Ref = +2.5 V is viable. However, output swing will be limited to ~1.4 V below VCC and above ground, requiring careful signal headroom planning for the INA141PA.
What is the purpose of the Ref pin on the INA141PA?
The Ref pin on the INA141PA sets the output reference level-it is not internally grounded. The output voltage is VO = G × (VIN+ – VIN–) + VREF. To achieve ground-referenced output, Ref must be tied to a low-impedance ground (≤8 Ω). Any series resistance degrades CMR; for example, 8 Ω raises effective CMR from 117 dB to ~80 dB at G = 1. This makes proper Ref routing essential in all INA141PA designs.
Is the INA141PA still in production?
No, the INA141PA is marked OBSOLETE by Texas Instruments per its official packaging information. While Aetrix Electronics maintains legacy inventory and supply-chain continuity support, new designs should consider active alternatives like INA141UA (SO-8) or functionally similar parts such as AD620ANZ. Lifecycle coordination and last-time-buy planning are available for ongoing INA141PA deployment.
INA141PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 750µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
INA141PA FAQ
1.How can I place an order for INA141PA through Aetrix?
Please submit a Request for Quotation (RFQ) for INA141PA 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 INA141PA reliable?
The price and inventory of INA141PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA141PA is usually 5 days.
3.What payment methods are accepted for INA141PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA141PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA141PA?
INA141PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA141PA 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 INA141PA?
For technical support, including INA141PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA141PA requirements.
6.How does Aetrix verify that INA141PA is sourced from the original manufacturer or authorized distributors?
All INA141PA 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 INA141PA meets industry standards.
7.What is the process for return or replacement of INA141PA?
All INA141PA units undergo pre-shipment inspection (PSI). If there is an issue with INA141PA, 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 INA141PA part is unused and in its original packaging.
Return procedure for INA141PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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