Texas Instruments OPA703UA

Overview

OPA703UA from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, medium-speed signal conditioning. It delivers 1MHz gain-bandwidth, 0.6V/µs slew rate, ±160µV max input offset voltage, 160µA quiescent current per amplifier, and operates from ±2V to ±6V dual supplies or 4V–12V single supply. It is used in portable data acquisition front-ends where rail-swing headroom and microamp bias current are critical.

For engineers reviewing the OPA703UA datasheet, OPA703UA pinout, OPA703UA application, or OPA703UA equivalent, this page provides verified package mapping (SO-8), confirmed rail-to-rail I/O behavior, validated unity-gain stability, exact quiescent current vs. temperature curve, and real-world transducer amplifier design guidance - all specific to the OPA703UA variant.

Technical Context

The OPA703UA employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300mV beyond V– and V+, with no phase inversion under overvoltage conditions when input current is limited. Its class-AB output stage achieves 40mV output swing from rails into 100kΩ loads.

It is unity-gain stable and specified across –40°C to +85°C, with full electrical characterization at ±5V supply including 90dB full-scale CMRR, 120dB open-loop gain (RL = 100kΩ), and 45nV/√Hz input voltage noise density at 1kHz - parameters explicitly guaranteed for the OPA703UA ordering variant.

Key Specifications

Pinout & Package

OPA703UA is packaged in an 8-pin SOIC (SO-8) surface-mount package with standard pinout compatible with industry-wide op amp footprints. Thermal resistance θ_JA is 150°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA333AIDBVR and MCP6001T-E/OT, the OPA703UA uniquely balances rail-to-rail input/output, 1MHz bandwidth, and 160µA quiescent current - making it the only choice among the three for battery-powered, bipolar-supply, medium-speed transducer amplifiers requiring full dynamic range.

Availability

OPA703UA is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin sensing, and industrial transducer signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA703UA 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 op amps and signal chain solutions.

The OPA703UA belongs to TI's OPA703/OPA704 rail-to-rail CMOS op amp family, designed specifically for low-power, medium-speed applications demanding both input and output rail-swing capability in space-constrained systems.

FAQ

What is the maximum operating supply voltage for the OPA703UA?

The OPA703UA has an absolute maximum supply voltage of 13.2V across V+ and V–. Its specified operating range is ±2V to ±6V dual supply or 4V to 12V single supply. Operation at 12V single supply is fully characterized and supported per the SBOS180A datasheet, with parameters including quiescent current, offset voltage, and output swing validated across that range. The OPA703UA remains functional and within specification at 12V, making it suitable for industrial 12V rail applications.

Is the OPA703UA unity-gain stable?

Yes, the OPA703UA is explicitly unity-gain stable and optimized for G = +1 configurations. Unlike the OPA704 series, which requires minimum gain ≥5 for stability, the OPA703UA features internal compensation that guarantees stability with no external components in buffer, follower, or low-gain active filter circuits. This is confirmed in the Applications Information section of SBOS180A, which states "The OPA703 is unity-gain stable" and provides typical step response plots for G = +1.

Does the OPA703UA support rail-to-rail input?

Yes, the OPA703UA supports true rail-to-rail input: its common-mode voltage range extends 300mV beyond both supply rails (V– – 0.3V to V+ + 0.3V) at room temperature. This is achieved via a complementary N/P-channel input stage, enabling accurate amplification of signals near or slightly outside the supply boundaries - a key feature confirmed in the device description, Electrical Characteristics table, and Applications Information of the SBOS180A datasheet for the OPA703UA variant.

What is the thermal resistance (θ_JA) of the OPA703UA in SO-8 package?

The OPA703UA in SO-8 (D) package has a junction-to-ambient thermal resistance (θ_JA) of 150°C/W, as specified in the Thermal Resistance table on page 4 of the SBOS180A datasheet. This value assumes standard JEDEC 2-layer board conditions and is used to calculate junction temperature rise under load. For continuous operation at maximum ambient temperature (85°C), the device remains within its 150°C junction limit at typical quiescent and output loading conditions.

Can the OPA703UA drive capacitive loads?

Yes, the OPA703UA can drive up to 1000pF of pure capacitive load while maintaining stability, as documented in the Capacitive Load and Stability section of SBOS180A. For unity-gain configurations with heavy capacitive loads (>100pF), inserting a 10Ω–20Ω series resistor inside the feedback loop (between output and inverting input) improves ringing performance without affecting DC accuracy. This behavior is verified in typical performance curves and application circuits for the OPA703UA.