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Texas Instruments INA2141PA
- Part No.:
- INA2141PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
INA2141PA.pdf
- Description:
- IC OPAMP INSTR 200KHZ DUAL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,618
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Product details
Overview
INA2141PA from Burr-Brown (now Texas Instruments) is a dual, low-power instrumentation amplifier with fixed gains of 10 V/V or 100 V/V, laser-trimmed for 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, draws only 750 µA per amplifier, and is housed in a 16-pin plastic DIP package rated for –40°C to +85°C - ideal for precision sensor signal conditioning in battery-powered medical and industrial systems.
For engineers reviewing the INA2141PA datasheet, INA2141PA pinout, INA2141PA application, or INA2141PA equivalent, key selection considerations include its dual-channel architecture, fixed-gain configuration (no external resistors required), ±40 V input overvoltage protection, 200 kHz bandwidth at G = 100, and compatibility with low-voltage ±2.25 V operation - all critical for high-accuracy, noise-sensitive analog front-ends.
Technical Context
The INA2141PA implements a 3-op-amp current-feedback topology enabling wide bandwidth (200 kHz at G = 100) while maintaining low quiescent current (750 µA per channel). Its internal laser-trimmed resistor network sets precise gains of 10 or 100 V/V via jumper selection, eliminating external gain-setting components and minimizing board-level error sources.
Each channel features independent overvoltage protection (±40 V absolute max), separate Sense and Ref terminals for remote sensing and reference control, and fully isolated bias networks to minimize crosstalk (< –120 dB at DC). Input common-mode range extends to within 1.4 V of either supply rail, scaling dynamically with output swing and supply voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | Fixed 10 V/V or 100 V/V via jumper; no external resistors needed - simplifies layout and improves gain accuracy stability. |
| Input Offset Voltage | 50 µV max (G = 100); enables sub-0.01% measurement accuracy in mV-level sensor outputs like thermocouples. |
| CMR | 117 dB min at G = 100; rejects >99.999% of common-mode interference in noisy industrial environments. |
| Supply Range | ±2.25 V to ±18 V; supports single-supply-derived rails and ultra-low-power battery operation without performance compromise. |
| Bandwidth | 200 kHz at G = 100; preserves signal fidelity for fast transients in bridge-based load cell or strain gauge monitoring. |
| Quiescent Current | 750 µA per amplifier; allows dual-channel precision amplification in energy-constrained portable diagnostics equipment. |
| Input Protection | ±40 V absolute max on each input; eliminates need for external clamping diodes in harsh ESD-prone industrial I/O modules. |
Pinout & Package
INA2141PA is supplied in a 16-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin spacing follows standard 0.1-inch grid; package meets JEDEC MS-001 and is rated for –40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | VINA+, VINA– | Differential inputs for Channel A; high-impedance (10¹⁰ Ω || 2 pF) nodes requiring bias current return path for linear operation. |
| 3, 4 | RefA, VOA | Channel A reference and output; RefA sets output DC level - must be low-impedance to preserve CMR (>8 Ω degrades CMR to ~80 dB). |
| 5, 6 | SenseA, V– | Channel A output sense and negative supply; SenseA connects directly to load for Kelvin-sensing accuracy; V– is shared supply rail. |
| 7, 8 | VINB+, VINB– | Differential inputs for Channel B; electrically isolated from Channel A - enables true dual independent instrumentation paths. |
| 9, 10 | RefB, VOB | Channel B reference and output; identical function to RefA/VOA - supports independent DC offset control per channel. |
| 11, 12 | SenseB, V+ | Channel B output sense and positive supply; SenseB enables remote load sensing; V+ is shared supply rail. |
| 13–16 | Jumper pins (G = 100) | Shorting pins 13–14 or 15–16 configures Channel A or B for G = 100; open = G = 10 - defines gain without external components. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed gain resistors | ±0.05% max gain error at G = 100 ensures calibrated measurement accuracy without field calibration. |
| Independent overvoltage protection | ±40 V tolerance per input pin - protects against transient surges in motor drive feedback or industrial sensor wiring. |
| Low 0.1–10 Hz noise | 0.2 µVp-p (G = 100) enables high-resolution DC-coupled measurements in ECG and RTD applications. |
| Current-feedback architecture | Maintains 200 kHz bandwidth at G = 100 - outperforms voltage-feedback IAs in dynamic sensor response requirements. |
| Separate Sense/Ref terminals | Allows 4-wire remote sensing and programmable output offset - critical for multi-channel data acquisition with shared references. |
Applications
| Thermocouple Amplifier | ECG Front-End |
|---|---|
Use Scenario: Amplifying microvolt-level thermocouple outputs (e.g., Type K, 41 µV/°C) in furnace temperature controllers with ±0.5°C accuracy requirement. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier providing matched gain, offset, and CMR for cold-junction compensation and differential thermocouple signal extraction. Use Value: 50 µV max offset and 0.5 µV/°C drift ensure <0.1°C self-heating error; ±40 V input protection guards against relay-induced transients during thermal cycling. | Use Scenario: Conditioning biopotential signals from limb electrodes in portable ECG monitors operating from coin-cell batteries. IC Role / Device Role / Timing Role: Dual IA channel processing lead-I and lead-II differential voltages with independent Ref pins enabling right-leg drive synthesis. Use Value: 750 µA per channel enables >100-hour battery life; 117 dB CMR suppresses 50/60 Hz mains interference without notch filtering; low 0.2 µVp-p noise preserves ST-segment morphology. |
| Bridge Sensor Interface | Multi-Channel Data Acquisition |
Use Scenario: Reading full-bridge strain gauges in structural health monitoring nodes deployed on bridges or wind turbine blades. IC Role / Device Role / Timing Role: Dual IA channel amplifying two independent bridge outputs (e.g., load + torque) with simultaneous sampling capability. Use Value: 200 kHz bandwidth captures mechanical resonance signatures up to 100 kHz; ±2.25 V minimum supply supports energy-harvesting power sources; G = 100 setting resolves <1 µε strain resolution. | Use Scenario: Signal conditioning stage in modular PLC analog input modules requiring eight synchronized, isolated sensor channels. IC Role / Device Role / Timing Role: Dual IA per IC serving as two independent precision gain blocks in a 16-channel system, reducing component count vs. single-channel alternatives. Use Value: Pin-compatible dual architecture cuts PCB area by 40% vs. discrete IAs; independent Sense/Ref pins enable local ground referencing per channel to break ground loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2128UA | Externally programmable gain (1–10,000 V/V) via single resistor; ±0.005% gain error; higher 1.2 mA IQ. | Required when variable or non-standard gains (e.g., G = 50, G = 200) are needed across multiple sensor types in one system. | Select INA2128UA if gain flexibility outweighs power budget constraints; INA2141PA remains optimal for fixed-G = 10/100 deployments. |
| AD8422ARZ | Single-channel, G = 1–1000 via resistor; 25 µV offset; 10 MHz bandwidth at G = 1; 1.2 mA IQ; SOIC-8 package. | Better suited for high-speed, single-ended sensor interfaces where board space is constrained and dual-channel integration is unnecessary. | Choose AD8422ARZ for compact, high-bandwidth single-channel designs; INA2141PA delivers dual-channel integration and lower power in space-tolerant systems. |
Compared with INA2128UA and AD8422ARZ, the INA2141PA offers unique value in fixed-gain, ultra-low-power dual-channel applications - trading programmability and speed for 50% lower quiescent current and inherent channel matching, making it optimal for battery-powered multi-sensor platforms where G = 10 or 100 suffices.
Availability
INA2141PA is available at Aetrix Electronics and suitable for thermocouple amplification, ECG front-end design, bridge sensor interfacing, and multi-channel data acquisition requiring stable component supply and long-term obsolescence management.
Supply support for INA2141PA 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
Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in high-precision analog ICs including instrumentation amplifiers, data converters, and op amps for demanding measurement applications.
The INA2141PA belongs to Burr-Brown's precision dual instrumentation amplifier product line, engineered specifically for low-drift, low-noise, dual-channel sensor signal conditioning in medical, industrial, and test equipment where channel matching and power efficiency are critical.
FAQ
What is the maximum supply voltage rating for the INA2141PA?
The INA2141PA 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. Absolute maximum ratings specify ±18 V on each supply rail, and operation beyond this risks permanent damage. The device maintains full specified performance across the entire ±2.25 V to ±18 V range, including low-voltage battery operation.
Does the INA2141PA require external resistors to set gain?
No, the INA2141PA does not require external resistors to set gain. It provides factory-laser-trimmed internal resistors that support two precise fixed gains: 10 V/V (jumper open) and 100 V/V (jumper installed between designated pins). This eliminates gain-setting resistor tolerances and layout parasitics, ensuring ±0.05% max gain error at G = 100 - a key advantage of the INA2141PA over externally configured instrumentation amplifiers.
How is input overvoltage protection implemented in the INA2141PA?
The INA2141PA integrates internal overvoltage protection circuitry on each input pin, allowing safe operation with input voltages up to ±40 V - even when power supplies are disconnected. This protection limits input current to approximately 1.5–5 mA during overload, preventing damage without requiring external series resistors or clamping diodes. The INA2141PA's protection is bidirectional and functions independently per input, preserving signal integrity under fault conditions.
What is the purpose of the Sense and Ref pins on the INA2141PA?
The Sense pins (SenseA/SenseB) provide Kelvin connection points to monitor output voltage directly at the load, compensating for PCB trace resistance and improving closed-loop accuracy. The Ref pins (RefA/RefB) set the output DC level - grounding them establishes zero-reference output, while applying a voltage offsets the entire output range. Both pins must be driven with low impedance (<8 Ω) to maintain the INA2141PA's specified 117 dB CMR; high-impedance connections degrade rejection significantly.
Can the INA2141PA operate from a single supply?
The INA2141PA is specified for dual-supply operation (±2.25 V to ±18 V) and does not support true single-supply operation. However, it can be used with split-rail derived from a single supply (e.g., using a charge pump or virtual ground generator) as long as both V+ and V– rails are present and meet the ±2.25 V minimum requirement. Its input common-mode range extends to within 1.4 V of each rail, enabling operation with reduced headroom - but a true single-ended supply configuration is not supported.
INA2141PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
INA2141PA FAQ
1.How can I place an order for INA2141PA through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2141PA 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 INA2141PA reliable?
The price and inventory of INA2141PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2141PA is usually 5 days.
3.What payment methods are accepted for INA2141PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2141PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2141PA?
INA2141PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2141PA 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 INA2141PA?
For technical support, including INA2141PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2141PA requirements.
6.How does Aetrix verify that INA2141PA is sourced from the original manufacturer or authorized distributors?
All INA2141PA 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 INA2141PA meets industry standards.
7.What is the process for return or replacement of INA2141PA?
All INA2141PA units undergo pre-shipment inspection (PSI). If there is an issue with INA2141PA, 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 INA2141PA part is unused and in its original packaging.
Return procedure for INA2141PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA2141PA Tags
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