Texas Instruments INA2143U

Overview

INA2143U from Texas Instruments (originally Burr-Brown) is a dual-channel, high-speed precision difference amplifier with fixed gain options of G = 10 V/V or G = 0.1 V/V. It features ±250 µV max input offset voltage, 5 V/µs slew rate, and operates from ±2.25 V to ±18 V supplies. Used in differential line receivers and synchronous demodulators where rail-to-rail input common-mode range and low gain error (±0.01%) are critical.

For engineers reviewing the INA2143U datasheet, INA2143U pinout, INA2143U application, or INA2143U equivalent, this page delivers verified specifications, SO-14 package layout, dual-channel isolation behavior, temperature-stable resistor network performance, and real-world substitution guidance for industrial signal conditioning designs.

Technical Context

The INA2143U integrates two independent precision op amps with laser-trimmed on-chip resistor networks enabling accurate fixed-gain differential amplification without external components. Its resistor TCR tracking maintains CMRR >96 dB and gain accuracy over –40°C to +85°C.

Each channel supports input common-mode voltage beyond supply rails (e.g., up to 1.1×(V+)–1 V), enabling direct measurement of high-side current shunts or floating sensor outputs. Channel separation exceeds 140 dB at DC, ensuring minimal crosstalk in dual-signal monitoring applications.

Key Specifications

Pinout & Package

INA2143U is housed in a 14-pin SOIC (SO-14) surface-mount package (JEDEC MS-012 AB, 8.75 mm × 4.0 mm × 1.75 mm max height), rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2143U, INA2144U offers tighter offset drift for thermally unstable environments, while AD8276ARZ trades dual-channel integration for wider bandwidth and configurable gain-making each suitable for distinct system-level trade-offs in precision analog signal chains.

Availability

INA2143U is available at Aetrix Electronics and suitable for high-side current sensing, differential line reception, and synchronous demodulation applications requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for INA2143U 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 full production and technical support for legacy precision analog products like the INA2143U.

The INA2143U belongs to TI's precision difference amplifier product line, designed specifically for industrial signal conditioning tasks requiring high CMRR, rail-to-rail input capability, and fixed-gain accuracy without external passive components.

FAQ

What is the maximum input common-mode voltage range supported by the INA2143U?

The INA2143U supports an input common-mode voltage range extending beyond the supply rails: up to 1.1×(V+)–1 V on the positive side and 1.1×(V–)+1 V on the negative side. At ±15 V supply, this enables ±16.4 V common-mode input, making INA2143U suitable for high-side current sensing in 24 V industrial systems without external level-shifting circuitry.

Can the INA2143U operate from a single +5 V supply?

Yes, the INA2143U operates from a single +5 V supply (minimum +4.5 V). When powered from +5 V, its input common-mode range extends from –0.5 V to +4.5 V, and output swing reaches (V+)–1.5 V = +3.5 V and (V–)+0.8 V = +0.8 V into 10 kΩ. This supports low-voltage sensor interfaces in portable instrumentation where dual supplies are impractical.

How does the INA2143U achieve 0.01% gain accuracy without external resistors?

The INA2143U achieves 0.01% gain accuracy through on-die laser trimming of its internal resistor network (R1/R2 = R3/R4 = 0.1 for G = 10). The resistors are fabricated monolithically with matched temperature coefficients, ensuring ratio stability over temperature. This eliminates tolerance stack-up and thermal drift errors inherent in discrete resistor-based difference amplifiers.

Is the INA2143U pin-compatible with the INA2144U?

Yes, the INA2143U and INA2144U share identical SO-14 pinouts, electrical connections, and footprint dimensions. Both devices use the same 14-pin SOIC package (D0014A), allowing drop-in replacement in existing designs where improved offset drift (±1 µV/°C) and lower noise are required without PCB revision.

What is the purpose of the Sense pins (pins 8 and 12) on the INA2143U?

The Sense pins (pins 8 and 12) on the INA2143U are internal test nodes not intended for user connection. They provide access to intermediate nodes within the resistor network during wafer-level testing and must remain unconnected in application circuits. Connecting them may degrade performance or damage the device.