Texas Instruments INA2141UG4

Overview

INA2141UG4 from Texas Instruments (originally Burr-Brown) is a dual, low-power instrumentation amplifier with laser-trimmed gain of 10 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 delivers 200 kHz bandwidth at G = 100 - ideal for precision thermocouple, RTD, and bridge sensor conditioning in battery-powered medical and industrial systems.

For engineers reviewing the INA2141UG4 datasheet, INA2141UG4 pinout, INA2141UG4 application, or INA2141UG4 equivalent, key selection criteria include guaranteed dual-channel independence, ±40 V input overvoltage protection, low 750 µA per amplifier quiescent current, fixed-gain accuracy (±0.05% max at G = 10), and SOIC-16 surface-mount packaging compatible with automated assembly.

Technical Context

The INA2141UG4 implements a 3-op-amp current-feedback architecture enabling wide bandwidth even at high gain-200 kHz at G = 100 and 1 MHz at G = 10-without external resistors. Its dual channels are fully isolated, with no shared bias circuitry, ensuring negligible crosstalk (< –120 dB at DC).

Each channel features integrated overvoltage protection on both inputs (±40 V absolute rating), laser-trimmed internal resistor networks for gain accuracy, and separate Sense and Ref terminals enabling remote-sense output regulation and precise common-mode rejection-critical for high-impedance sensor interfaces where Ref path impedance directly degrades CMR.

Key Specifications

Pinout & Package

INA2141UG4 is housed in a 16-pin SOIC (DW) package, RoHS-compliant, with 1.27 mm pitch and JEDEC-standard dimensions (10.3 mm × 7.5 mm × 2.35 mm). Pin 1 is marked by a beveled corner or dot; device orientation follows standard SOIC top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2141UG4, INA2128UA trades fixed-gain precision and ultra-low IQ for programmable gain flexibility, while AD8422ARZ offers higher bandwidth and lower offset in a single-channel format but requires external protection and doubles component count for dual-sensor applications.

Availability

INA2141UG4 is available at Aetrix Electronics and suitable for precision sensor signal conditioning, medical biopotential acquisition, industrial bridge readout, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.

Supply support for INA2141UG4 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 acquired Burr-Brown in 2000 and maintains its legacy of high-precision analog ICs. TI specializes in data converters, amplifiers, and interface products for industrial, automotive, and medical markets.

The INA2141UG4 belongs to TI's precision instrumentation amplifier product line, engineered specifically for low-drift, low-power, dual-channel sensor signal conditioning in harsh electromagnetic and thermal environments.

FAQ

What is the maximum input voltage the INA2141UG4 can tolerate without damage?

The INA2141UG4 features robust input protection rated for ±40 V absolute maximum voltage on each input terminal-even with power supplies disconnected. This allows direct interfacing with industrial field wiring and eliminates need for external clamping diodes. The protection circuit limits input current to 1.5–5 mA during overload, preserving functionality after transient events. Always verify that common-mode voltage remains within linear input range (e.g., (V+) – 1.4 V to (V–) + 1.7 V at ±15 V supplies) for accurate amplification. The INA2141UG4 datasheet specifies this limit in Absolute Maximum Ratings.

Can the INA2141UG4 operate from a single 5 V supply?

Yes, the INA2141UG4 supports single-supply operation down to ±2.25 V, meaning it functions with a 5 V rail (±2.5 V equivalent) or even 4.5 V (±2.25 V). However, input common-mode range shrinks at low supply voltages-e.g., at ±2.5 V, linear input range is approximately –1.0 V to +1.0 V referenced to mid-supply. Output swing also compresses: expect ~1.2 V headroom from each rail. For 5 V single-supply use, bias inputs near V_CC/2 and set Ref pins to same potential. The INA2141UG4 maintains 750 µA/channel IQ and 117 dB CMR across this range, as confirmed in typical performance curves.

How does the Sense and Ref pin configuration improve measurement accuracy in the INA2141UG4?

The INA2141UG4 uses dedicated SenseA/SenseB and RefA/RefB terminals to decouple output sensing from load connections and establish precise output reference points. Connecting SenseA directly to the load (not the output pin) enables Kelvin sensing, eliminating errors from PCB trace resistance. RefA must be tied to a low-impedance ground (≤8 Ω series resistance) to preserve >110 dB CMR; higher impedance degrades rejection. This architecture allows the INA2141UG4 to maintain accuracy even with long traces or high-current return paths-critical for RTD and bridge sensors. The INA2141UG4 application note Figure 1 details proper routing.

Is the INA2141UG4 pin-compatible with other members of the INA21xx family?

No, the INA2141UG4 is not pin-compatible with other INA21xx variants such as INA2128 or INA2143. While all share the SOIC-16 (DW) package, pin functions differ significantly: INA2128 replaces jumper-selectable gain with external gain-resistor terminals (Pins 13–14), and INA2143 relocates Sense/Ref pins and adds shutdown control. The INA2141UG4's unique pinout-especially jumper-based gain selection on Pins 13–16 and dual Sense/Ref pairs-is specific to its fixed-gain, dual-channel architecture. Substitution requires PCB redesign. Always consult the respective datasheet pin configuration diagrams before replacement.

What is the typical settling time of the INA2141UG4 at G = 100, and how does it impact dynamic sensor measurements?

The INA2141UG4 achieves 9 µs settling time to 0.01% for a ±5 V step at G = 100, as specified in the Electrical Characteristics table. This performance stems from its current-feedback topology, which maintains bandwidth and speed despite low 750 µA quiescent current. In practice, this enables accurate capture of fast transients in strain gauge impact testing or pulse oximetry waveforms without slew-induced distortion. Settling time increases slightly at temperature extremes (e.g., +125°C), but remains under 12 µs. For comparison, at G = 10, settling is 7 µs-making the INA2141UG4 suitable for multiplexed multi-sensor systems requiring rapid channel switching. The INA2141UG4 datasheet Figure 7 confirms this behavior.