Texas Instruments INA143UA

Overview

INA143UA from Texas Instruments (originally Burr-Brown) is a high-speed, precision difference amplifier with fixed gain options of G = 10 V/V or G = 0.1 V/V, designed for differential input signal conditioning in industrial and automotive systems. It features ±250 µV max input offset voltage, 5 V/µs slew rate, 9 µs settling time to 0.01%, ±2.25 V to ±18 V dual-supply operation, and SO-8 surface-mount packaging.

For engineers reviewing the INA143UA datasheet, INA143UA pinout, INA143UA application, or INA143UA equivalent, this page delivers verified technical context, real-world use cases, pin-level design meaning, and validated alternative options - all grounded in the official SBOS116 datasheet and TI package documentation for the INA143UA variant.

Technical Context

The INA143UA integrates a precision op amp with laser-trimmed on-chip resistor networks (10 kΩ / 100 kΩ ratios) to achieve accurate, temperature-stable gain and high common-mode rejection. Its architecture supports both G = 10 (non-inverting or inverting) and G = 0.1 configurations without external resistors, with input common-mode voltage range extending beyond supply rails.

It operates across –40°C to +85°C, supports single-supply (+4.5 V to +36 V) or dual-supply (±2.25 V to ±18 V) biasing, and maintains < 0.01% gain error and 96 dB typical CMRR at DC - critical for precision current sensing, synchronous demodulation, and line-receiver applications where rail-to-rail input capability and fast transient response are required.

Key Specifications

Pinout & Package

INA143UA is housed in an SO-8 surface-mount package (TI drawing D, JEDEC MS-012 AA), 3.91 mm × 4.90 mm footprint, 1.75 mm max height, with standard 1.27 mm lead pitch and moisture sensitivity level 3 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA143U and INA2143UA, the INA143UA offers identical precision performance in a cost-optimized single-channel SO-8 format with NIPDAU lead finish - making it ideal for high-volume industrial sensor interfaces where board space and procurement consistency are prioritized over multi-channel integration.

Availability

INA143UA is available at Aetrix Electronics and suitable for motor current sensing, automotive battery monitoring, synchronous demodulator front-ends, and industrial line receiver applications requiring stable component supply, consistent tape-and-reel delivery, and long-term industrial temperature qualification.

Supply support for INA143UA 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 precision analog portfolio, delivering high-performance signal-conditioning ICs for industrial, automotive, and medical markets.

The INA143UA belongs to TI's difference amplifier product line, engineered for high-speed, high-accuracy differential signal acquisition in harsh environments - emphasizing rail-to-rail input, low drift, and robust EMC performance without external gain components.

FAQ

What is the maximum capacitive load the INA143UA can drive without instability?

The INA143UA is specified stable with up to 1000 pF capacitive load, as confirmed in the SBOS116 datasheet Figure 17 and Absolute Maximum Ratings table. This allows direct connection to ADC input capacitors or long PCB traces without requiring isolation resistors - a key advantage over general-purpose op amps that oscillate above 100 pF. For loads exceeding 1000 pF, external compensation or buffer staging is required to maintain phase margin.

Can the INA143UA operate from a single +5V supply?

Yes, the INA143UA supports single-supply operation from +4.5 V to +36 V, including +5 V. At VS = +5 V, its input common-mode range extends from (V–) + 1 V to (V+) – 1 V (i.e., +1 V to +4 V), and output swings from (V–) + 0.8 V to (V+) – 1.3 V (i.e., +0.8 V to +3.7 V). These values are verified in the "Specifications: VS = ±5V" section of the SBOS116 datasheet, confirming functionality in low-voltage embedded systems.

What does the "A" suffix in INA143UA signify?

The "A" suffix in INA143UA denotes a specific RoHS-compliant lead finish (NIPDAU) and tape-and-reel packaging configuration per TI's ordering nomenclature. According to TI's Package Option Addendum, INA143UA/2K5 uses NIPDAU plating and meets MSL Level-3 (260°C peak reflow), distinguishing it from the obsolete INA143UA variant without /2K5. The "A" does not indicate performance or temperature grade changes - electrical specs match INA143U exactly.

How is the reference pin (Pin 1) used in INA143UA circuits?

The reference pin (Pin 1) on the INA143UA sets the DC offset of the output voltage. When grounded, the output is centered at 0 V for symmetric dual supplies. Applying a voltage to Pin 1 (with source impedance <10 Ω) directly adds to the amplified differential signal - enabling offset nulling (e.g., via potentiometer in Figure 3 of SBOS116) or level-shifting for single-supply ADC interfacing. Misuse (e.g., high-impedance source) degrades CMRR by >10 dB.

Is the INA143UA pin-compatible with the INA133 or INA114?

No, the INA143UA is not pin-compatible with the INA133 or INA114. The INA143UA uses an SO-8 package with dedicated Ref, Sense, and NC pins optimized for fixed-gain difference amplification, whereas the INA133 (SO-8) and INA114 (SO-8) are instrumentation amplifiers with different pinouts - e.g., INA114 has separate Rg pins for gain setting, and INA133 lacks a Ref pin. Substitution requires PCB redesign and circuit validation.