Texas Instruments INA2133UA

Overview

INA2133UA from Texas Instruments is a dual-channel, high-speed precision difference amplifier optimized for accurate differential signal conditioning in industrial measurement systems. It delivers ±450 μV max offset voltage, 1.5 MHz bandwidth, and ±2.25V to ±18V dual-supply operation - enabling precise current sensing and sensor signal extraction in battery test equipment and servo drive feedback loops.

For engineers reviewing the INA2133UA datasheet, INA2133UA pinout, INA2133UA application, or INA2133UA equivalent, key selection criteria include guaranteed CMRR over temperature, rail-to-rail input common-mode range extending beyond supply rails, dual-channel isolation for low crosstalk, and laser-trimmed resistor matching ensuring <0.05% gain error.

Technical Context

The INA2133UA integrates two independent, matched precision op-amps with on-chip 25 kΩ laser-trimmed resistor networks per channel - enabling unity-gain difference amplification without external components. Its internal ratio-matched resistors maintain >80 dB CMRR across –40°C to +85°C and support input common-mode voltages from (2 × V–) + 3 V to (2 × V+) – 3 V.

Each channel operates with separate power pins (V+, V–), reference (Ref A/B), sense (Sense A/B), and input terminals (+In/–In), allowing fully independent configuration. The device uses bipolar (CSO: SHE) or CMOS (CSO: RFB) process variants - with CSO: RFB delivering 20 V/μs slew rate and CSO: SHE offering 5 V/μs and lower noise.

Key Specifications

Pinout & Package

INA2133UA is housed in a 14-pin SOIC surface-mount package (8.65 mm × 6.00 mm), rated for industrial temperature range (–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 INA2133U, the INA2133UA offers broader CSO coverage (SHE/RFB) and guaranteed 20 V/μs slew rate in RFB variant, while INA282AIDR trades configurability for integrated current-sense functionality - making it unsuitable as a drop-in replacement but viable for simplified current-monitoring subsystems.

Availability

INA2133UA is available at Aetrix Electronics and suitable for battery test equipment, servo drive feedback systems, and industrial level transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA2133UA 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 chain solutions.

The INA2133UA belongs to TI's high-accuracy difference amplifier product line, designed specifically for industrial measurement applications demanding low drift, wide input voltage range, and dual-channel independence in harsh environments.

FAQ

What is the maximum input common-mode voltage for INA2133UA at ±15V supply?

The INA2133UA supports an input common-mode voltage range from (2 × V–) + 3 V to (2 × V+) – 3 V. With ±15V supplies, this translates to –27V to +27V - enabling measurement of differential signals that exceed the supply rails by up to 3 V. This capability is critical for high-side current sensing in industrial power systems where the sensed node may float significantly above ground.

Does INA2133UA require external resistors for unity-gain difference amplification?

No, the INA2133UA does not require external resistors for unity-gain difference amplification. It integrates four laser-trimmed 25 kΩ on-chip resistors per channel, precisely matched for gain accuracy and CMRR. These internal resistors eliminate the need for external precision resistors and associated layout sensitivity - simplifying design and improving thermal tracking versus discrete implementations.

How does the CSO designation affect INA2133UA performance?

The CSO (Chip Site Origin) designation indicates fabrication site and process variant: CSO: SHE delivers 5 V/μs slew rate and lower 0.01–10 Hz noise (2 μVPP), while CSO: RFB provides 20 V/μs slew rate and higher bandwidth stability. Both variants meet all datasheet specifications, but system-level performance (e.g., transient response, noise floor) depends on the specific CSO shipped - TI qualifies both for full specification compliance.

Can INA2133UA operate from a single 24V supply?

Yes, the INA2133UA supports single-supply operation from +4.5V to +36V. When using a +24V supply, connect V– to ground and configure Ref A/B appropriately (e.g., to mid-supply for bipolar signal handling). Input common-mode range becomes 0V to 45V, and output swing remains within 1.5V of each rail - enabling direct interfacing with 24V PLC I/O modules and industrial sensors.

What is the recommended bypass capacitance for INA2133UA power pins?

Texas Instruments recommends a 0.1 μF low-ESR ceramic capacitor placed as close as possible between each supply pin (V+, V–) and ground. For dual-supply operation, use two separate capacitors - one from V+ to ground and one from V– to ground. This minimizes high-frequency supply noise coupling and ensures stable operation up to 1.5 MHz, especially in noisy industrial environments where EMI could degrade CMRR.