Texas Instruments INA2133U

Overview

INA2133U from Texas Instruments is a dual-channel, high-speed precision difference amplifier designed for accurate differential signal conditioning in industrial measurement systems. It delivers ±450 μV max offset voltage, 1.5 MHz bandwidth, and ±2.25 V to ±18 V dual-supply operation - enabling precise current sensing and sensor signal extraction in battery test equipment and servo feedback loops.

For engineers reviewing the INA2133U datasheet, INA2133U pinout, INA2133U application, or INA2133U equivalent, key selection criteria include guaranteed CMRR ≥80 dB over temperature, fast 5.5 μs settling to 0.01%, dual-channel isolation for multi-sensor systems, and SOIC-14 package compatibility with industrial PCB layouts.

Technical Context

The INA2133U integrates two independent, laser-trimmed precision op-amps with matched on-chip 25 kΩ resistor networks per channel - enabling unity-gain difference amplification without external components. Its internal ratio-matched resistors ensure stable gain accuracy and common-mode rejection across temperature.

Each channel operates with rail-to-rail input common-mode range extending to 2×(V+)−3 V and 2×(V−)+3 V, supporting signals beyond supply rails. The device uses bipolar (CSO: SHE) process technology, delivering 5 V/μs slew rate and low 80 nV/√Hz input voltage noise at 10 Hz.

Key Specifications

Pinout & Package

INA2133U is housed in a 14-pin SOIC surface-mount package (8.65 mm × 6.00 mm), rated for −40°C to +85°C industrial operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2133U, INA2134U trades bandwidth for superior DC accuracy, while AD8276ARZ reduces size and cost at the expense of speed and supply flexibility - making INA2133U optimal for balanced high-speed, high-precision dual-channel sensing.

Availability

INA2133U is available at Aetrix Electronics and suitable for battery test equipment, servo drive feedback systems, and photovoltaic string monitoring requiring stable component supply across extended production lifecycles.

Supply support for INA2133U 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 decades of expertise in precision signal conditioning ICs.

The INA2133U belongs to TI's INAx133 family of high-speed difference amplifiers, engineered specifically for industrial current sensing, sensor signal extraction, and multi-channel measurement systems demanding both speed and DC accuracy.

FAQ

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

The INA2133U 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 operating temperature range and applies to both channels of the INA2133U independently.

Does the INA2133U require external resistors to configure as a difference amplifier?

No, the INA2133U does not require external resistors for basic unity-gain difference amplification. It integrates four laser-trimmed 25 kΩ resistors per channel - two forming the input divider and two setting the feedback ratio - achieving precise gain matching and high CMRR without discrete components. External resistors are only needed for non-unity gain configurations or offset adjustment, as detailed in the INA2133U datasheet Figure 7-7 through Figure 7-9.

Can both channels of the INA2133U operate simultaneously without crosstalk?

Yes, the INA2133U provides fully independent signal paths for Channel A and Channel B. Its SOIC-14 layout and internal design ensure <−80 dB channel separation at 10 kHz, and each channel remains functional even if the other is saturated, shorted, or overloaded. This isolation is confirmed in the INA2133U datasheet Section 7.1 and Figure 5-4 (Channel Separation vs Frequency), making it suitable for true simultaneous dual-sensor acquisition in INA2133U-based systems.

What is the recommended power supply decoupling for the INA2133U?

Texas Instruments recommends placing a 0.1 μF low-ESR ceramic capacitor between each supply pin (V+ and V−) and ground, located as close as possible to the respective pins. These capacitors must be routed directly to the device pins - not shared or daisy-chained - to maintain PSRR >85 dB and prevent oscillation. This requirement is specified in INA2133U datasheet Section 7.4 and Figure 7-27, and applies identically to both channels of the INA2133U.

Is the INA2133U pin-compatible with the single-channel INA133U?

No, the INA2133U is not pin-compatible with the INA133U. The INA133U uses an SOIC-8 package with 8 pins, while the INA2133U uses an SOIC-14 package with 14 pins and a different pin assignment - including dedicated pins for Channel B inputs and outputs. Board redesign is required to substitute INA2133U for INA133U; however, both share identical electrical specifications and functional architecture per channel, as confirmed in the INA2133U and INA133U datasheet Section 3 and Table 4-1/4-2.