Texas Instruments OPA704UA

Overview

OPA704UA from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for non-inverting gains ≥5. It delivers 3MHz gain-bandwidth product, 3V/µs slew rate, 160µA quiescent current, ±160µV input offset voltage, and operates from ±2V to ±6V dual supplies (or 4V–12V single supply). It is used in precision signal conditioning stages of portable data acquisition systems where low power and high dynamic performance at moderate gain are required.

For engineers reviewing the OPA704UA datasheet, OPA704UA pinout, OPA704UA application, or OPA704UA equivalent, key selection considerations include its gain-stability requirement (G ≥ 5), rail-to-rail output swing within 40mV of rails under light load, 1pA input bias current, and SO-8 package compatibility with legacy board layouts requiring 8-pin DIP/SO footprints.

Technical Context

The OPA704UA employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300mV beyond supply rails, and a class-AB output stage achieving rail-to-rail output swing down to 40mV from V+ or V− at 100kΩ load. Its internal compensation is tailored for stable operation only at closed-loop gains of 5 or greater.

Unlike the unity-gain-stable OPA703 series, the OPA704UA sacrifices low-gain stability to achieve higher bandwidth and slew rate-3MHz GBW and 3V/µs at G = +5-while maintaining full rail-to-rail I/O, 90dB CMRR at DC, and 120dB open-loop gain at 100kΩ load.

Key Specifications

Pinout & Package

OPA704UA is housed in an 8-pin SOIC (SO-8) surface-mount package with standard DIP-8 footprint compatibility and JEDEC MS-012AC outline. 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 OPA704NA and OPA2704UA, the OPA704UA offers the optimal balance of manufacturability (standard SO-8), thermal performance (150°C/W), and layout compatibility with legacy op-amp footprints-making it ideal for volume production where rework tolerance and test probe access matter.

Availability

OPA704UA is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin sensors, and industrial 4–20mA transmitters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for OPA704UA 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 solutions, with leadership in precision op amps, data converters, and power management ICs.

The OPA704UA belongs to TI's precision rail-to-rail CMOS op amp product line, designed specifically for low-power, medium-speed signal conditioning in battery-operated and space-constrained industrial and automotive systems.

FAQ

Is OPA704UA unity-gain stable?

No, the OPA704UA is not unity-gain stable. It is internally compensated for stable operation only at closed-loop gains of 5 or greater. Attempting to use OPA704UA in G = +1 or G = –1 configurations will result in oscillation or excessive ringing. For unity-gain applications, the pin-compatible OPA703UA must be selected instead.

What is the maximum capacitive load OPA704UA can drive reliably?

The OPA704UA can drive up to 1000pF of pure capacitive load when configured at G ≥ 5. Stability degrades significantly below G = 5; for G = +5, typical overshoot remains <10% with 1000pF load. At lower gains, external compensation (e.g., feedback resistor isolation) is required per Figure 5 in the SBOS180A datasheet.

Does OPA704UA support single-supply operation?

Yes, OPA704UA supports true single-supply operation from 4V to 12V. Its rail-to-rail input extends 300mV beyond V– and V+, and rail-to-rail output swings to within 40mV of either rail under light load-enabling direct interfacing with 3.3V or 5V microcontrollers and ADCs without level-shifting circuitry.

What is the meaning of "OPA704UA/2K5.B" in the ordering code?

"OPA704UA/2K5.B" denotes the OPA704UA in SO-8 package supplied on large tape-and-reel with 2500 units per reel; the ".B" suffix indicates packaging per TI's standard carrier specification (e.g., embossed plastic tape, 12mm width, 4mm pocket depth), ensuring compatibility with automated SMT placement equipment.

How does OPA704UA handle input voltages exceeding the supply rails?

OPA704UA input terminals are diode-clamped to the supply rails. Inputs may safely exceed V+ or fall below V– by up to 0.3V continuously; beyond that, input current must be limited to ≤10mA using a series resistor to prevent ESD diode conduction damage. No phase inversion occurs if this current limit is respected.