Texas Instruments OPA4703UA/2K5

Overview

OPA4703UA/2K5 from Texas Instruments is a quad-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, medium-speed signal conditioning in single- or dual-supply systems. It delivers 1 MHz gain-bandwidth product, 0.6 V/µs slew rate, ±160 µV input offset voltage, 160 µA quiescent current per amplifier, and operates from 4 V to 12 V (±2 V to ±6 V). It is used in portable data acquisition front-ends where supply headroom and precision are constrained.

For engineers reviewing the OPA4703UA/2K5 datasheet, OPA4703UA/2K5 pinout, OPA4703UA/2K5 application, or OPA4703UA/2K5 equivalent, key selection criteria include rail-to-rail I/O swing with 40 mV output-to-rail capability at light loads, 1 pA input bias current for high-impedance sensor interfacing, unity-gain stability, and SO-14 package compatibility with legacy board layouts.

Technical Context

The OPA4703UA/2K5 implements a complementary differential input stage enabling rail-to-rail common-mode input range extending 300 mV beyond both supply rails, and a class-AB output stage delivering rail-to-rail output swing within 40 mV of V+ or V– under 100 kΩ load. Its unity-gain stable architecture supports direct use in buffer, active filter, and transducer amplifier configurations without external compensation.

Each amplifier channel features 90 dB full-scale CMRR, 120 dB open-loop gain (RL = 100 kΩ), and 45 nV/√Hz input voltage noise density at 1 kHz - characteristics validated across –40°C to +85°C. The device is specified for operation up to 125°C junction temperature and supports capacitive load drive up to 1000 pF when configured for G ≥ 5.

Key Specifications

Pinout & Package

OPA4703UA/2K5 is housed in a 14-pin SOIC (SO-14) surface-mount package with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Thermal resistance θ_JA is 100°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad rail-to-rail op amp applications.

Compared with OPA4703UA/2K5, OPA4703EA/2K5 offers identical performance in a smaller footprint but demands tighter process control, while TLV2474IDR trades 3.75× higher quiescent current for 3.5× greater bandwidth - making it suitable for higher-speed, non-battery-critical industrial nodes.

Availability

OPA4703UA/2K5 is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin electronics, and industrial process transmitters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for OPA4703UA/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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision op amps and signal chain solutions.

The OPA703/704 family was designed specifically for low-power, rail-to-rail signal conditioning in portable and space-constrained systems - balancing speed, precision, and quiescent current for battery-operated measurement front-ends.

FAQ

What is the maximum capacitive load the OPA4703UA/2K5 can drive stably?

The OPA4703UA/2K5 can drive up to 1000 pF of pure capacitive load while maintaining stability, especially when configured for closed-loop gains ≥ 5. In unity-gain configurations, adding a 10–20 Ω series resistor inside the feedback loop improves phase margin and reduces ringing - a technique validated in TI's SBOS180A application note. This capability makes OPA4703UA/2K5 suitable for driving ADC input capacitors and long PCB traces without external isolation.

Does the OPA4703UA/2K5 support true rail-to-rail input beyond the supply rails?

Yes - the OPA4703UA/2K5 features a complementary input stage that extends the common-mode input voltage range to (V–) – 0.3 V and (V+) + 0.3 V at room temperature. Input signals exceeding the rails by up to 300 mV are safely clamped by internal ESD diodes, provided input current is limited to ≤10 mA (e.g., via series resistor). This behavior is confirmed in the Absolute Maximum Ratings table and Application Information section of the OPA703/704 datasheet (SBOS180A).

What is the guaranteed output voltage swing for OPA4703UA/2K5 at 20 kΩ load?

At 20 kΩ load and room temperature, the OPA4703UA/2K5 guarantees output swing within 75 mV of either supply rail while maintaining >100 dB open-loop gain - a specification explicitly stated in the Electrical Characteristics table under "Voltage Output Swing from Rail." This ensures usable dynamic range in 5 V systems (e.g., 0.075 V to 4.925 V) and supports accurate 12-bit+ resolution in buffered ADC interfaces.

Is the OPA4703UA/2K5 unity-gain stable, and how does it differ from OPA4704UA/2K5?

Yes, the OPA4703UA/2K5 is unity-gain stable, whereas the OPA4704UA/2K5 is optimized for gains ≥ 5 and is not unity-gain stable. The OPA4703UA/2K5 delivers 1 MHz GBW and 0.6 V/µs slew rate, while OPA4704UA/2K5 achieves 3 MHz GBW and 3 V/µs slew rate at G ≥ 5. Both share identical quiescent current, offset, and rail-to-rail I/O - making OPA4703UA/2K5 the correct choice for buffers, integrators, and G = 1–4 filters.

What package variants are available for the OPA4703UA/2K5, and is there a TSSOP option?

The OPA4703UA/2K5 is exclusively offered in the 14-pin SOIC (SO-14) package with part marking "OPA4703UA" and tape-and-reel quantity of 2500 units. A TSSOP-14 variant exists as OPA4703EA/2K5 (part marking "OPA4703EA"), but it is a distinct orderable number with different thermal and mechanical characteristics - not a drop-in replacement due to differing land patterns and thermal pad requirements. Always verify footprint compatibility before substitution.