Texas Instruments INA141U/2K5

Overview

INA141U/2K5 from Texas Instruments is a precision, low-power 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 bridge, thermocouple, and RTD sensor signal conditioning for industrial data acquisition systems.

For engineers reviewing the INA141U/2K5 datasheet, INA141U/2K5 pinout, INA141U/2K5 application, or INA141U/2K5 equivalent, key selection criteria 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 with only 750 µA quiescent current.

Technical Context

The INA141U/2K5 employs a 3-op-amp current-feedback architecture enabling 200 kHz bandwidth at G = 100 and 1 MHz at G = 10 - preserving dynamic performance despite low power consumption. Its laser-trimmed thin-film resistors set precise internal gain ratios without external components.

Input overvoltage protection circuitry clamps each input independently to ±40 V, sustaining fault conditions without damage or latch-up. The Ref pin defines output common-mode level and requires low-impedance grounding to maintain >110 dB CMR; series resistance >8 Ω degrades rejection significantly.

Key Specifications

Pinout & Package

INA141U/2K5 is housed in an 8-pin SOIC (SO-8) surface-mount package per JEDEC MS-012, 150 °C/W θ_JA, RoHS-compliant with CU NIPDAU finish and MSL Level-3 rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with INA141U/2K5, INA128P offers flexible gain but higher power and larger footprint, while AD620ARZ delivers superior drift and CMR at the cost of unprotected inputs and increased design complexity - making INA141U/2K5 optimal for robust, fixed-gain industrial sensor interfaces.

Availability

INA141U/2K5 is available at Aetrix Electronics and suitable for industrial data acquisition, sensor signal conditioning, and medical device front-ends requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for INA141U/2K5 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 designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and communications markets.

The INA141U/2K5 belongs to TI's precision instrumentation amplifier product line, engineered for high-accuracy, low-power sensor signal conditioning in harsh environments where reliability and parametric stability are critical.

FAQ

What gain options does the INA141U/2K5 support, and how are they configured?

The INA141U/2K5 supports two fixed 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 accuracy at G = 10. A jumper resistance under 0.5 Ω is required to avoid gain error; external resistors for intermediate gains are not recommended due to ±25% internal resistor tolerance. This configuration applies specifically to the INA141U/2K5 SO-8 variant.

Does the INA141U/2K5 require external components for basic operation?

No, the INA141U/2K5 operates with only power supplies (±2.25 V to ±18 V), input signals, and a low-impedance ground connection to the Ref pin (Pin 6). Decoupling capacitors (e.g., 0.1 µF) near V+ and V– pins are recommended for noisy supplies. No external gain-setting resistors, offset trim, or input protection devices are needed - the INA141U/2K5 integrates ±40 V input protection and laser-trimmed precision resistors internally.

What is the maximum input common-mode voltage range for the INA141U/2K5?

At ±15 V supplies, the INA141U/2K5 supports an input common-mode range of (V–) + 1.7 V to (V+) – 1.4 V - i.e., –13.3 V to +13.6 V. This range narrows at lower supply voltages (e.g., ±2.25 V yields ≈ –0.55 V to +0.85 V). The actual linear input range also depends on output voltage swing; typical curves in the INA141U/2K5 datasheet show this dependency. Inputs beyond this range may saturate internal amplifiers without damaging the device due to integrated ±40 V protection.

How does the INA141U/2K5 handle input overvoltage conditions?

The INA141U/2K5 features built-in overvoltage protection on both inputs, allowing safe operation with differential or common-mode voltages up to ±40 V - even with power supplies disconnected. Internal protection circuitry limits input current to 1.5–5 mA during overload, preventing damage. This eliminates the need for external TVS diodes or series resistors in industrial applications exposed to ESD or inductive kickback, directly enhancing system robustness for the INA141U/2K5.

Is the INA141U/2K5 suitable for battery-powered applications?

Yes, the INA141U/2K5 is optimized for low-power operation with only 750 µA quiescent current and operation down to ±2.25 V supplies. Its combination of precision (±50 µV offset), low drift (0.5 µV/°C), and wide supply range enables multi-year battery life in portable sensors and wireless condition monitoring nodes. The SO-8 package of the INA141U/2K5 also supports compact PCB layouts essential for handheld and wearable medical or industrial devices.