Texas Instruments INA2133U/2K5G4

Overview

INA2133U/2K5G4 from Texas Instruments is a dual-channel, high-speed precision difference amplifier in SOIC-14 package, delivering ±450μV max offset voltage, 1.5MHz bandwidth, and 5.5μs settling time to 0.01%. It operates from ±2.25V to ±18V supplies and supports input common-mode voltages beyond rails-enabling accurate current sensing and voltage monitoring in battery formation systems and servo drive feedback loops.

For engineers reviewing the INA2133U/2K5G4 datasheet, INA2133U/2K5G4 pinout, INA2133U/2K5G4 application, or INA2133U/2K5G4 equivalent, key selection criteria include guaranteed dual-channel isolation, laser-trimmed resistor network for <0.05% gain error, CSO-specific slew rate (5 V/μs or 20 V/μs), industrial temperature range (−40°C to +85°C), and compatibility with rail-to-rail input signal conditioning in high-accuracy analog front-ends.

Technical Context

The INA2133U/2K5G4 integrates two independent precision op amps with on-chip, laser-trimmed 25kΩ resistor networks-each channel configured as a unity-gain difference amplifier with matched R1/R2 and R3/R4 ratios. Its internal architecture enables wide input common-mode range (2×V−+3V to 2×V++3V) by resistive signal division prior to op amp inputs, preserving CMRR over temperature via tight TCR tracking.

It supports dual-supply operation only (±2.25V to ±18V) and exhibits chip-site-origin–dependent performance: CSO:SHE delivers 5 V/μs slew rate and 2 μVPP 0.01Hz–10Hz noise, while CSO:RFB provides 20 V/μs slew rate and lower broadband noise (20 nV/√Hz at 1kHz). Both variants maintain 90 dB min CMRR and 850–950 μA quiescent current per channel.

Key Specifications

Pinout & Package

INA2133U/2K5G4 is housed in a 14-pin SOIC (D) package measuring 8.65 mm × 6.00 mm, with standard 1.27 mm pitch and gull-wing leads. Thermal resistance is R_θJA = 71.4°C/W, enabling operation at full spec under natural convection in industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2133U/2K5G4, INA2134U/2K5 lacks dual-channel integration and bandwidth, increasing board area and limiting dynamic response; AD8276ARZ-RL offers superior DC specs but sacrifices speed and supply flexibility-making INA2133U/2K5G4 optimal for high-fidelity, dual-signal, wide-supply industrial sensing.

Availability

INA2133U/2K5G4 is available at Aetrix Electronics and suitable for battery test systems, servo motor controllers, sensor data loggers, and solar string inverters requiring stable component supply across extended production lifecycles.

Supply support for INA2133U/2K5G4 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 specializing in analog and embedded processing technologies, with over 50 years of innovation in precision signal chain solutions.

The INA2133U/2K5G4 belongs to TI's INAx133 family of high-speed difference amplifiers, designed specifically for industrial and energy infrastructure applications demanding rail-overlapping inputs, dual-channel independence, and laser-trimmed gain accuracy without external components.

FAQ

What is the maximum input common-mode voltage range supported by the INA2133U/2K5G4?

The INA2133U/2K5G4 supports an input common-mode voltage range from (2 × V−) + 3 V to (2 × V+) − 3 V. For example, with ±15 V supplies, this extends from −27 V to +27 V-enabling direct high-side current sensing without external level-shifting circuitry. This specification is validated across the full −40°C to +85°C temperature range and applies to both channels independently in the INA2133U/2K5G4.

Does the INA2133U/2K5G4 require external gain-setting resistors?

No, the INA2133U/2K5G4 does not require external gain-setting resistors. It integrates four laser-trimmed 25 kΩ on-chip resistors configured for unity-gain difference amplification. The resistor ratios are trimmed to ensure ≤0.05% gain error and <10 ppm/°C gain drift-eliminating component count, layout sensitivity, and thermal tracking errors associated with discrete resistor networks in the INA2133U/2K5G4.

How does the chip site origin (CSO) affect the performance of the INA2133U/2K5G4?

The INA2133U/2K5G4 is manufactured in two chip site origins: CSO:SHE and CSO:RFB. CSO:SHE delivers 5 V/μs slew rate and 2 μVPP 0.01Hz–10Hz noise; CSO:RFB provides 20 V/μs slew rate and lower broadband noise (20 nV/√Hz at 1kHz). Both meet all other specifications-including ±450 μV max offset and 1.5 MHz bandwidth-so design-in is safe across either CSO, though system-level speed/noise trade-offs must be verified per batch in the INA2133U/2K5G4.

Can the INA2133U/2K5G4 operate from a single supply?

No, the INA2133U/2K5G4 is specified and tested for dual-supply operation only (±2.25 V to ±18 V). While the internal architecture allows some functionality with asymmetric supplies, TI does not guarantee performance-including input common-mode range, output swing, or CMRR-under single-supply conditions. For single-rail applications, the pin-compatible INA2134U/2K5 is the recommended alternative to the INA2133U/2K5G4.

What is the purpose of the Sense pins (Pins 10 and 12) on the INA2133U/2K5G4?

The Sense pins (Pins 10 and 12) on the INA2133U/2K5G4 are internal connections to the inverting-side resistor network and are not intended for external use. They serve only internal gain configuration and must remain unconnected in all PCB layouts. No external circuitry should be attached to Pins 10 or 12-doing so may degrade CMRR, cause instability, or violate absolute maximum ratings in the INA2133U/2K5G4.