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Texas Instruments INA2141UA/1K
- Part No.:
- INA2141UA/1K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
INA2141UA/1K.pdf
- Description:
- IC INST AMP 2 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,210
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Product details
Overview
INA2141UA/1K from Texas Instruments (originally Burr-Brown) is a dual, low-power instrumentation amplifier with fixed gains of 10 V/V or 100 V/V, 50 µV max input offset voltage, 0.5 µV/°C max drift, and 117 dB min CMR at G = 100. It operates from ±2.25 V to ±18 V supplies and draws only 750 µA per channel - ideal for precision sensor signal conditioning in battery-powered medical and industrial systems.
For engineers reviewing the INA2141UA/1K datasheet, INA2141UA/1K pinout, INA2141UA/1K application, or INA2141UA/1K equivalent, key selection criteria include guaranteed gain accuracy (±0.05% max at G = 10), ±40 V input overvoltage protection, dual-channel independence, SOIC-16 surface-mount packaging, and operation across –40°C to +85°C.
Technical Context
The INA2141UA/1K implements a 3-op-amp current-feedback architecture enabling 200 kHz bandwidth at G = 100 and 1 MHz at G = 10 - unusually wide for a 750 µA/channel device. Its laser-trimmed internal resistor network sets precise gain without external components, while separate SenseA/SenseB feedback terminals support remote output sensing for improved load regulation.
Each channel features fully independent bias circuitry, eliminating DC crosstalk; AC crosstalk remains below –100 dB up to 10 kHz. Input overvoltage protection clamps current to ~1.5–5 mA at ±40 V, and inputs remain protected even with supplies disconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | Fixed 10 V/V (jumper open) or 100 V/V (jumper installed); no external resistors needed |
| Input Offset Voltage | 50 µV max (RTI, G = 100); enables sub-0.01% error in 10 mV full-scale bridge measurements |
| CMR | 117 dB min at G = 100; rejects >99.99998% of common-mode noise in noisy industrial environments |
| Supply Range | ±2.25 V to ±18 V; supports single-supply operation down to ±2.25 V with full rail-to-rail output swing capability |
| Quiescent Current | 750 µA per amplifier; allows dual-channel precision amplification in <2 mA total system supply budget |
| Input Protection | Withstands ±40 V on either input independently; eliminates need for external series resistors that degrade noise performance |
| Bandwidth | 200 kHz at G = 100; sufficient for ECG, strain gauge, and RTD signal acquisition without aliasing |
Pinout & Package
INA2141UA/1K is housed in a 16-pin SOIC (DW package drawing), RoHS-compliant, moisture sensitivity level 3 (260°C peak reflow), with 1000-unit tape-and-reel packaging (reel diameter 330 mm, width 16.4 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (A1A, A2A) | Channel A Inverting/Non-inverting Inputs | Differential input pair for first instrumentation amplifier; high-Z (10¹⁰ Ω || 9 pF) with ±40 V fault tolerance |
| 3 (RefA) | Channel A Output Reference | Low-impedance reference node for VOA; must be tied to ground or stable reference to maintain >110 dB CMR |
| 4 (SenseA) | Channel A Output Sense Feedback | Connects directly to VOA terminal to enable remote-sensing compensation for PCB trace resistance |
| 5 (V–) | Negative Supply Rail | Common negative supply for both channels; accepts ±2.25 V to ±18 V operation |
| 6, 7 (A1B, A2B) | Channel B Inverting/Non-inverting Inputs | Fully independent second differential input pair; zero DC crosstalk with Channel A |
| 8 (RefB) | Channel B Output Reference | Independent reference for VOB; decoupled from RefA to prevent inter-channel coupling |
| 9 (SenseB) | Channel B Output Sense Feedback | Enables independent remote sensing for Channel B output; critical for multi-load applications |
| 10 (V+) | Positive Supply Rail | Common positive supply for both channels; complements V– for symmetrical or asymmetrical supplies |
| 11–16 | Gain Jumper Pins (A/B) | Short pins 11–12 and 15–16 for G = 100; leave open for G = 10; <0.5 Ω series resistance required for ±0.1% gain accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed gain resistors | ±0.05% max gain error at G = 10 ensures calibrated measurement accuracy without factory trimming |
| Current-feedback topology | Maintains 200 kHz bandwidth at G = 100 - 5× faster than conventional voltage-feedback IAs at same power |
| Independent dual-channel design | No shared bias circuitry; eliminates DC offset coupling and enables true simultaneous dual-sensor acquisition |
| Input overvoltage protection | Clamps ±40 V faults without external components, preserving 0.2 µVP-P (0.1–10 Hz) low-frequency noise performance |
| Low thermal drift | 0.5 µV/°C max offset drift minimizes calibration drift over –40°C to +85°C industrial temperature range |
Applications
| ECG Signal Conditioning | Strain Gauge Bridge Amplification |
|---|---|
|
Use Scenario: Amplifying microvolt-level differential signals from electrode pairs in portable ECG monitors with 50/60 Hz mains interference. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier acquiring lead-I and lead-II simultaneously; RefA/RefB grounded to system analog ground. Use Value: 117 dB CMR rejects common-mode noise; 200 kHz bandwidth captures QRS complex fidelity; ±40 V input protection guards against defibrillator discharge events. |
Use Scenario: Reading Wheatstone bridge outputs from load cells in industrial weighing systems where excitation voltage varies ±10%. IC Role / Device Role / Timing Role: Fixed-gain (G = 100) signal conditioner converting bridge imbalance to 0–5 V output; SenseA/SenseB used for 4-wire Kelvin sensing. Use Value: Laser-trimmed 50 µV offset enables <0.02% FS accuracy; ±2.25 V minimum supply supports low-power 3.3 V systems; dual channels allow redundant bridge monitoring. |
| RTD Temperature Sensing | Multi-Channel Data Acquisition |
|
Use Scenario: Precision 3-wire Pt100 RTD measurements in HVAC controllers requiring 0.1°C resolution over –20°C to +80°C. IC Role / Device Role / Timing Role: Channel A amplifies RTD voltage drop; Channel B buffers reference voltage for ratiometric conversion; RefA/RefB tied to ADC reference. Use Value: 0.5 µV/°C drift contributes <0.005°C/°C error; 10¹⁰ Ω input impedance prevents RTD self-heating errors; dual channels reduce board space vs two discrete IAs. |
Use Scenario: Simultaneous acquisition of thermocouple, pressure transducer, and humidity sensor outputs in environmental monitoring nodes. IC Role / Device Role / Timing Role: Two independent IA channels condition different sensor types; G = 10 for thermocouples, G = 100 for low-output pressure sensors. Use Value: Independent bias networks eliminate inter-channel offset coupling; 750 µA/channel enables 12-bit SAR ADC sampling at 1 kSPS within 2.5 mA total system budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2128UA/1K | Externally programmable gain (1–10,000 V/V) via single resistor; higher 1.2 mA/channel quiescent current | Required when variable gain or gains outside 10/100 range are needed; less suitable for ultra-low-power designs | Select INA2128UA/1K only if gain flexibility outweighs 60% higher supply current and loss of laser-trimmed 0.05% gain accuracy. |
| AD8226ARZ | Single-channel, lower cost; 200 µV max offset; 120 dB CMR; 1.25 mA quiescent current; SOIC-8 package | Requires two devices for dual-channel use; lacks independent Sense/Ref pins and ±40 V input protection | Choose AD8226ARZ for cost-sensitive single-sensor applications where ±40 V protection and remote sensing are not required. |
Compared with INA2128UA/1K and AD8226ARZ, the INA2141UA/1K uniquely delivers laser-trimmed 0.05% gain accuracy, dual-channel independence with no shared bias, and integrated ±40 V input protection - making it optimal for compact, high-reliability dual-sensor systems where fixed 10/100 gain suffices.
Availability
INA2141UA/1K is available at Aetrix Electronics and suitable for ECG monitoring, industrial weighing systems, RTD temperature sensing, and multi-channel data acquisition requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for INA2141UA/1K 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 (TI) acquired Burr-Brown in 2000 and maintains its precision analog portfolio, delivering high-accuracy signal chain solutions for industrial, medical, and test equipment markets.
The INA2141 series was designed specifically for dual-channel, low-power, high-CMR sensor signal conditioning - targeting applications where space-constrained PCBs demand integrated gain accuracy, input ruggedness, and thermal stability without external trimming.
FAQ
What gain options does the INA2141UA/1K support, and how are they configured?
The INA2141UA/1K supports two fixed gains: 10 V/V and 100 V/V. Gain is selected per channel using jumper connections on pins 11–12 (Channel A) and 15–16 (Channel B). Leaving the jumper open configures G = 10; installing a low-resistance (<0.5 Ω) jumper sets G = 100. Internal laser-trimmed resistors ensure ±0.05% gain accuracy at G = 10 without external components. The INA2141UA/1K datasheet specifies these configurations in Figure 1 and the "Setting the Gain" section.
Does the INA2141UA/1K require external resistors to set gain?
No, the INA2141UA/1K does not require external resistors to set gain. Its gain is determined solely by internal laser-trimmed resistor networks and jumper configuration (open = G = 10, shorted = G = 100). External resistors are discouraged because internal resistor values vary ±25% from nominal, making external gain-setting inaccurate. This eliminates resistor matching tolerances and board space - a key advantage of the INA2141UA/1K over programmable alternatives like the INA2128.
What is the maximum input voltage the INA2141UA/1K can withstand without damage?
The INA2141UA/1K inputs are individually protected to ±40 V - meaning each input (VINA, VINB, etc.) can tolerate up to +40 V or –40 V relative to ground, even with power supplies disconnected. This protection clamps input current to 1.5–5 mA during overload, preventing damage without requiring external series resistors that would degrade noise performance. The INA2141UA/1K absolute maximum ratings table explicitly states "Analog Input Voltage Range: ±40 V" and confirms operation under these conditions.
How does the INA2141UA/1K achieve high bandwidth at high gain?
The INA2141UA/1K achieves 200 kHz bandwidth at G = 100 using a current-feedback amplifier topology in its input stage, unlike conventional voltage-feedback instrumentation amplifiers. This architecture decouples bandwidth from gain dependency, allowing wide small-signal bandwidth even at high closed-loop gains. The INA2141UA/1K's "Dynamic Performance" section confirms this behavior, citing the "Gain vs Frequency" curve and noting that current-feedback enables excellent settling time (9 µs to 0.01%) despite only 750 µA per channel quiescent current.
Can the INA2141UA/1K operate from a single supply, and what are the limitations?
Yes, the INA2141UA/1K can operate from split supplies (±2.25 V to ±18 V) or single-ended supplies (e.g., +5 V and ground), but the input common-mode range and output swing depend on supply headroom. With ±2.25 V supplies, linear input range is limited to ~1.4 V below V+ and ~1.7 V above V–. For single-supply use, RefA/RefB must be biased to mid-supply (e.g., 2.5 V for +5 V system) to center the output. The INA2141UA/1K "Low Voltage Operation" section details these constraints and provides typical curves for ±2.5 V and ±5 V operation.
INA2141UA/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 200 kHz
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 1.5mA (x2 Channels)
- 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:
- 16-SOIC
INA2141UA/1K FAQ
1.How can I place an order for INA2141UA/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2141UA/1K 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 INA2141UA/1K reliable?
The price and inventory of INA2141UA/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2141UA/1K is usually 5 days.
3.What payment methods are accepted for INA2141UA/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2141UA/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2141UA/1K?
INA2141UA/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2141UA/1K 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 INA2141UA/1K?
For technical support, including INA2141UA/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2141UA/1K requirements.
6.How does Aetrix verify that INA2141UA/1K is sourced from the original manufacturer or authorized distributors?
All INA2141UA/1K 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 INA2141UA/1K meets industry standards.
7.What is the process for return or replacement of INA2141UA/1K?
All INA2141UA/1K units undergo pre-shipment inspection (PSI). If there is an issue with INA2141UA/1K, 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 INA2141UA/1K part is unused and in its original packaging.
Return procedure for INA2141UA/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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