Texas Instruments INA141UA

Overview

INA141UA 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 SO-8 surface-mount package. It operates from ±2.25 V to ±18 V supplies, draws only 750 µA quiescent current, and is used in thermocouple amplification, bridge sensing, and medical instrumentation where accuracy and low power are critical.

For engineers reviewing the INA141UA datasheet, INA141UA pinout, INA141UA application, or INA141UA equivalent, this page delivers verified specifications, real-world use contexts, pin-level design meaning, and validated alternative options - all grounded in TI's official INA141 family documentation and ordering data for the exact SO-8 variant INA141UA.

Technical Context

The INA141UA implements a 3-op-amp current-feedback architecture enabling 200 kHz bandwidth at G = 100 while maintaining low power consumption. Its laser-trimmed internal resistor network ensures ±0.05% gain accuracy at G = 10 and supports only two discrete gain settings via jumper configuration - no external resistors required.

Input protection withstands ±40 V differential or common-mode overvoltage without damage, and its high input impedance (10¹⁰ Ω || 9 pF) demands explicit bias current return paths. The Ref pin establishes output reference level and must be connected with low impedance to preserve CMR above 100 dB.

Key Specifications

Pinout & Package

INA141UA is housed in an 8-pin SOIC (SO-8) package per JEDEC MS-012, with standard 1.27 mm pitch and RoHS-compliant CU NIPDAU finish (Moisture Sensitivity Level 3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA128UA and AD620ARZ, the INA141UA trades programmability and raw speed for ultra-low quiescent current (750 µA), guaranteed fixed gains, and simplified layout - making it optimal for cost-sensitive, battery-powered, or high-CMR industrial sensor nodes where G = 10 or 100 suffices.

Availability

INA141UA is available at Aetrix Electronics and suitable for bridge amplifier circuits, thermocouple signal conditioning, and medical biosignal acquisition requiring stable component supply, long-term manufacturability, and RoHS-compliant SO-8 packaging.

Supply support for INA141UA 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 delivering analog and embedded processing solutions, with deep expertise in precision signal chain components.

The INA141 belongs to TI's precision instrumentation amplifier product line, engineered for high-accuracy, low-power sensor interface applications in industrial automation, test equipment, and portable medical devices.

FAQ

What gain options does the INA141UA support, and how are they configured?

The INA141UA supports only two precise gain settings: G = 10 (default, no connection between Pins 1 and 8) and G = 100 (jumper or 0 Ω resistor between Pins 1 and 8). Internal laser-trimmed resistors ensure ±0.05% gain error at G = 10. External resistors are not supported - attempting to set intermediate gains introduces uncertainty due to ±25% internal resistor variation. This fixed-gain architecture simplifies layout and improves production yield for the INA141UA.

Does the INA141UA require external components for basic operation?

Yes - the INA141UA requires two 0.1 µF ceramic decoupling capacitors: one between Pins 4 (V–) and ground, and another between Pins 7 (V+) and ground, placed within 1 cm of the device. A low-impedance connection (≤8 Ω) to the Ref pin (Pin 5) is also mandatory to maintain >100 dB CMR. No external gain-setting resistors are needed, but input bias current return paths (e.g., matched resistors to Ref) must be provided for proper linear operation - omission causes input saturation.

What is the maximum safe input voltage for the INA141UA, and how does protection work?

The INA141UA inputs are protected to ±40 V absolute maximum - meaning either input can safely withstand –40 V to +40 V relative to ground, even with power supplies disconnected. Protection is implemented via internal current-limiting circuitry that caps input current at ~1.5–5 mA during overload, preventing damage without external diodes or resistors. This specification is confirmed in the Absolute Maximum Ratings table and applies identically to both inputs of the INA141UA.

Can the INA141UA operate from a single supply, such as +5 V?

No - the INA141UA is specified only for dual-supply operation (±2.25 V to ±18 V). Its internal architecture requires symmetrical positive and negative rails; applying +5 V to V+ and grounding V– violates the Absolute Maximum Rating for V– (–40 V min) and will damage the device. For single-supply applications, TI recommends alternatives like the INA333 or INA826, which are explicitly designed for rail-to-rail operation from +2.7 V to +36 V. The INA141UA must always be powered with true bipolar supplies.

What is the operating temperature range for the INA141UA, and how does performance vary across it?

The INA141UA is specified for operation from –40°C to +85°C, with extended operating capability up to +125°C. Key parameters shift predictably: input offset drift is ±0.5 µV/°C max (G = 100), gain drift is ±10 ppm/°C, and quiescent current remains stable at 750 µA ±50 µA across the full range. These values are guaranteed in the Electrical Characteristics table and validated by TI wafer testing - ensuring reliable performance in automotive under-hood or industrial control cabinet environments where the INA141UA is deployed.