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Texas Instruments INA141UA/2K5G4
- Part No.:
- INA141UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA141UA/2K5G4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,189
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Product details
Overview
INA141UA/2K5G4 from Texas Instruments is a precision instrumentation amplifier with fixed gains of G = 10 or G = 100, 50 µV max input offset voltage, 0.5 µV/°C max drift, and 117 dB min CMR at G = 100 - used in thermocouple amplification, bridge sensing, and medical ECG front-ends where low power and high accuracy are critical.
For engineers reviewing the INA141UA/2K5G4 datasheet, INA141UA/2K5G4 pinout, INA141UA/2K5G4 application, or INA141UA/2K5G4 equivalent, key selection factors include guaranteed gain accuracy (±0.05% at G = 10), ±40 V input overvoltage protection, SO-8 package compatibility, and operation down to ±2.25 V supplies for battery-powered systems.
Technical Context
The INA141UA/2K5G4 employs a current-feedback 3-op-amp architecture enabling 200 kHz bandwidth at G = 100 and 1 MHz at G = 10 - preserving dynamic performance despite only 750 µA quiescent current. Its laser-trimmed thin-film resistors ensure precise internal gain ratios without external components.
Input stage overvoltage protection clamps to ±40 V independent of supply status, while the Ref pin establishes output reference potential - requiring low-impedance grounding to maintain >110 dB CMR. Input common-mode range is supply-dependent and collapses as output swing approaches rails.
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 needed; ±0.05% error at G = 10 ensures calibrated sensor signal scaling. |
| Input Offset Voltage | ±50 µV max at G = 100 - enables sub-100 µV-level DC measurement resolution in RTD or strain gauge bridges. |
| CMR | 117 dB min at G = 100 - rejects >99.99998% of common-mode interference in noisy industrial environments. |
| Supply Range | ±2.25 V to ±18 V - supports single-supply operation via level-shifting and enables direct integration into low-voltage portable devices. |
| Quiescent Current | 750 µA - allows continuous operation for years on coin-cell batteries in wireless sensor nodes. |
| Bandwidth | 200 kHz at G = 100 - captures fast transients in vibration monitoring or pulse oximetry without external compensation. |
| Input Protection | ±40 V absolute max - eliminates need for external series resistors or TVS diodes in field-connected sensor interfaces. |
Pinout & Package
INA141UA/2K5G4 is housed in an 8-pin SOIC (SO-8) surface-mount package per JEDEC MS-012, with 1.27 mm pitch and 5.0 mm × 6.2 mm body size. Thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Gain Select (Jumper) | Connect to Pin 8 to set G = 100; open for G = 10 - low-resistance jumper (<0.5 Ω) required to preserve gain accuracy. |
| 2 | Inverting Input (VIN–) | Differential input node with 1010 Ω || 9 pF impedance - requires bias current return path (e.g., matched resistors to Ref or ground). |
| 3 | Non-Inverting Input (VIN+) | Differential input node symmetric to Pin 2 - same high impedance and protection; both inputs tolerate ±40 V independently. |
| 4 | Negative Supply (V–) | Connects to negative rail; input common-mode range extends to (V–) + 1.7 V at ±15 V supplies - limits usable range at low voltages. |
| 5 | Output (VO) | Class-A output stage drives 10 kΩ loads; swings to within 1.4 V of rails - sets minimum headroom for ADC interface design. |
| 6 | Positive Supply (V+) | Connects to positive rail; input common-mode range extends to (V+) – 1.4 V - constrains max input voltage in high-gain configurations. |
| 7 | Reference (Ref) | Output reference point; must be low-impedance (≤8 Ω) to sustain >110 dB CMR - not internally tied to ground. |
| 8 | Gain Select (Jumper) | Paired with Pin 1 for G = 100 configuration - forms part of laser-trimmed internal resistor network (252 Ω / 5050 Ω ratio). |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed gain resistors | Enables ±0.05% gain error at G = 10 without external components - eliminates calibration steps in production test. |
| Input overvoltage protection | Withstands ±40 V on either input regardless of supply state - prevents latch-up or damage during sensor hot-plug or ESD events. |
| Low-drift offset voltage | 0.5 µV/°C max drift ensures <±1 µV total offset shift across –40°C to +85°C - critical for unattended environmental monitoring. |
| Current-feedback architecture | Delivers 200 kHz bandwidth at G = 100 with only 750 µA supply current - outperforms voltage-feedback amps of similar power class. |
| Wide supply range | Operates from ±2.25 V to ±18 V - supports dual-rail industrial PLC I/O modules and single-supply battery-powered data loggers. |
Applications
| Bridge Amplifier | Thermocouple Amplifier |
|---|---|
Use Scenario: Strain gauge Wheatstone bridge output (1–20 mV full-scale) in load cell or pressure transducer. IC Role / Device Role / Timing Role: Precision differential-to-single-ended conversion with fixed G = 100, rejecting bridge excitation noise and lead-wire interference. Use Value: 117 dB CMR suppresses 60 Hz mains pickup; ±50 µV offset enables <0.1% FS measurement accuracy without nulling circuitry. |
Use Scenario: Type K thermocouple (≈41 µV/°C) with cold-junction compensation in industrial oven controller. IC Role / Device Role / Timing Role: High-gain, low-noise amplification of microvolt-level Seebeck voltage while rejecting common-mode noise from heater switching. Use Value: 0.2 µVP-P (0.1–10 Hz) input-referred noise preserves temperature resolution to ±0.02°C; ±40 V input tolerance handles thermocouple disconnection faults. |
| RTD Sensor Amplifier | Medical Instrumentation |
Use Scenario: 3-wire Pt100 RTD measurement in HVAC thermostat with 2-wire lead compensation. IC Role / Device Role / Timing Role: Fixed-G = 10 amplification of ratiometric voltage drop across RTD, referenced to stable excitation current source. Use Value: 0.5 µV/°C drift minimizes temperature coefficient error; wide ±2.25 V supply range enables direct use with low-power MCU analog supply rails. |
Use Scenario: Front-end amplification of ECG differential signals (0.5–5 mV) in portable patient monitor. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier providing high CMR, low noise, and input protection against defibrillation pulses. Use Value: ±40 V input rating meets IEC 60601-1 defibrillation protection requirements; 750 µA quiescent current extends battery life in wearable designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128UA/2K5 | Externally programmable gain (1–10,000) via single resistor; higher 12.5 nV/√Hz noise at G = 100; 1.5 mA IQ. | Required when variable gain or non-standard ratios (e.g., G = 500) are needed - not suitable for fixed-G = 10/100 cost-sensitive designs. | Select INA128UA/2K5 only if gain flexibility outweighs 2× higher power and reduced DC accuracy (±0.005% vs ±0.05%). |
| AD620ARZ-REEL7 | G = 1–10,000 via external resistor; 60 µV max offset; 1.0 µA IQ; 1000 kHz BW at G = 10 - but no ±40 V input protection. | Suitable for lab-grade bench instruments where external protection can be added, but not for field-deployed sensors exposed to wiring faults. | Choose AD620ARZ-REEL7 for ultra-low-noise (9 nV/√Hz) or wider bandwidth needs, but add external TVS diodes if ±40 V tolerance is mandatory. |
Compared with INA128UA/2K5 and AD620ARZ-REEL7, the INA141UA/2K5G4 uniquely delivers factory-set G = 10/100 accuracy, integrated ±40 V protection, and lowest quiescent current - making it optimal for high-volume, safety-critical, or battery-operated sensor nodes where BOM count and power budget are constrained.
Availability
INA141UA/2K5G4 is available at Aetrix Electronics and suitable for bridge amplification, thermocouple interfacing, and medical ECG front-ends requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for INA141UA/2K5G4 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 amplifiers and data acquisition solutions.
The INA141 series was designed specifically for high-accuracy, low-power sensor signal conditioning in industrial process control, test equipment, and portable medical devices - emphasizing laser-trimmed DC precision and robust input protection.
FAQ
What gain options does the INA141UA/2K5G4 support, and how are they configured?
The INA141UA/2K5G4 supports two factory-set gains: G = 10 (default, no connection between Pins 1 and 8) and G = 100 (jumper installed between Pins 1 and 8). Internal laser-trimmed resistors ensure ±0.05% gain error at G = 10. The jumper must have ≤0.5 Ω series resistance to avoid degrading accuracy. External gain-setting resistors are not recommended due to ±25% internal resistor tolerance.
Does the INA141UA/2K5G4 require external input protection components?
No - the INA141UA/2K5G4 includes integrated input protection that withstands ±40 V on either input, even with supplies disconnected. This eliminates the need for external series resistors or TVS diodes in most industrial and medical sensor interfaces. However, a low-impedance path for input bias current (±2 nA typical) must still be provided via matched resistors or direct connection to Ref.
What is the operating temperature range for the INA141UA/2K5G4, and how does performance vary across it?
The INA141UA/2K5G4 is specified for –40°C to +85°C operation, with extended operating range up to +125°C. Key parameters remain stable: input offset drift is guaranteed ≤0.5 µV/°C, and quiescent current varies only from 750 µA to 800 µA across temperature. CMR degrades slightly at extremes - 110 dB min at G = 100 over full range - but remains sufficient for most industrial applications.
Can the INA141UA/2K5G4 operate from a single supply, and what design considerations apply?
Yes - the INA141UA/2K5G4 supports single-supply operation by biasing V– to ground and V+ to +5 V (or higher), but the Ref pin must be set to mid-supply (e.g., +2.5 V) to center the output swing. Input common-mode range shrinks at low supplies: with ±2.25 V, linear input range is limited to ~±0.8 V. Decoupling capacitors near pins and careful Ref pin routing are essential to maintain CMR.
How does the INA141UA/2K5G4 compare to chopper-stabilized amplifiers in low-frequency noise performance?
The INA141UA/2K5G4 achieves 0.2 µVP-P (0.1–10 Hz) input-referred noise at G = 100 - competitive with many chopper-stabilized amplifiers while avoiding their 1/f noise folding and switching artifacts. Unlike choppers, the INA141UA/2K5G4 delivers clean step response and no aliasing in dynamic measurements, making it preferable for mixed AC/DC sensor signals like vibration + temperature.
INA141UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA141UA/2K5G4 FAQ
1.How can I place an order for INA141UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA141UA/2K5G4 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 INA141UA/2K5G4 reliable?
The price and inventory of INA141UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA141UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for INA141UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA141UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA141UA/2K5G4?
INA141UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA141UA/2K5G4 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 INA141UA/2K5G4?
For technical support, including INA141UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA141UA/2K5G4 requirements.
6.How does Aetrix verify that INA141UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All INA141UA/2K5G4 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 INA141UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of INA141UA/2K5G4?
All INA141UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with INA141UA/2K5G4, 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 INA141UA/2K5G4 part is unused and in its original packaging.
Return procedure for INA141UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA141UA/2K5G4 Tags
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