Texas Instruments INA2133U/2K5

Overview

INA2133U/2K5 from Texas Instruments is a dual-channel, high-speed precision difference amplifier used for accurate differential signal conditioning in industrial measurement and feedback systems. It delivers ±450 μV max offset voltage, 1.5 MHz bandwidth, ±2.25 V to ±18 V dual-supply operation, and operates across −40°C to +85°C. It is deployed in servo drive position feedback and battery cell formation equipment.

For engineers reviewing the INA2133U/2K5 datasheet, INA2133U/2K5 pinout, INA2133U/2K5 application, or INA2133U/2K5 equivalent, key selection criteria include guaranteed gain error ≤0.05%, fast 5.5 μs settling to 0.01%, dual-channel isolation for low crosstalk, and rail-to-rail input common-mode range extending beyond supply rails.

Technical Context

The INA2133U/2K5 integrates two independent precision op-amps with laser-trimmed 25 kΩ resistor networks per channel, enabling unity-gain difference amplification with matched ratio accuracy. Its internal architecture supports wide common-mode input (2×V−+3 V to 2×V++3 V) and maintains CMRR ≥80 dB over frequency via on-die resistor matching and TCR tracking.

Each channel features separate Sense, +In, −In, Ref, and Output terminals, with no shared internal nodes-ensuring <−90 dB channel separation and independent overload recovery. The device operates in a single functional mode with no configuration pins or control logic, requiring only V+ and V− supplies and external decoupling.

Key Specifications

Pinout & Package

INA2133U/2K5 is housed in a SOIC-14 surface-mount package (8.65 mm × 6.00 mm), rated for industrial temperature operation (−40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2134U/2K5 and AD8273ARZ, the INA2133U/2K5 uniquely balances 1.5 MHz bandwidth, rail-exceeding input range, and ultra-low 0.05% gain error in a dual-channel SOIC-14 package-making it optimal for servo feedback and battery test systems demanding synchronized, high-fidelity differential measurements.

Availability

INA2133U/2K5 is available at Aetrix Electronics and suitable for servo drive position feedback, battery cell formation equipment, and industrial level transmitter designs requiring stable component supply and long-term production continuity.

Supply support for INA2133U/2K5 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 company specializing in analog and embedded processing technologies, with leadership in precision signal chain solutions.

The INA2133U/2K5 belongs to TI's INAx133 family of high-speed precision difference amplifiers, designed specifically for industrial measurement systems requiring rail-exceeding input range, low gain error, and dual-channel isolation.

FAQ

What is the maximum common-mode input voltage range supported by the INA2133U/2K5?

The INA2133U/2K5 supports a common-mode input 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 measurement of shunt voltages that exceed the supply rails. This specification is verified across the full −40°C to +85°C operating temperature range and applies to both channels of the INA2133U/2K5.

Does the INA2133U/2K5 require external gain-setting resistors?

No, the INA2133U/2K5 does not require external gain-setting resistors. It integrates four laser-trimmed 25 kΩ on-chip resistors per channel, configured for unity-gain difference amplification. Gain is fixed at 1 V/V with ±0.05% error, eliminating resistor matching errors and board space typically needed for discrete implementations of the INA2133U/2K5.

How does channel separation performance impact system design using the INA2133U/2K5?

The INA2133U/2K5 provides >−90 dB channel separation, meaning signals on Channel A have negligible coupling into Channel B output. This allows simultaneous, independent conditioning of two high-precision analog signals-such as motor current and bus voltage-without crosstalk-induced measurement errors. System designs relying on synchronized dual-channel acquisition, like string inverter MPPT control, benefit directly from this isolation in the INA2133U/2K5.

What is the recommended power supply decoupling for the INA2133U/2K5?

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 of the INA2133U/2K5. This minimizes high-frequency noise coupling and ensures stable operation, especially under fast transient loads. A single 0.1 μF capacitor suffices for single-supply configurations, but dual-supply operation requires two separate capacitors-one per rail-for the INA2133U/2K5.

Can the INA2133U/2K5 operate from a single 5-V supply?

Yes, the INA2133U/2K5 supports single-supply operation from +4.5 V to +36 V. When powered from +5 V, its input common-mode range becomes 0 V to +2 V (since V− = 0 V, V+ = +5 V → (2×0)+3 = +3 V and (2×5)−3 = +7 V, limited by absolute max ratings), and output swing is specified from +0.3 V to +4.2 V. All key specifications-including offset voltage, gain error, and bandwidth-are validated at +5 V in the INA2133U/2K5 datasheet.