Texas Instruments OPA4704UA

Overview

OPA4704UA from Texas Instruments is a quad-channel, rail-to-rail input/output CMOS operational amplifier optimized for gains ≥5, delivering 3MHz gain-bandwidth product and 3V/µs slew rate per channel at 160µA quiescent current per amplifier. It operates from ±2V to ±6V dual supplies (or 4V–12V single supply), features 160µV max input offset voltage, 90dB full-scale CMRR, and 1pA input bias current - enabling precision signal conditioning in automotive sensor interfaces and portable data acquisition systems.

For engineers reviewing the OPA4704UA datasheet, OPA4704UA pinout, OPA4704UA application, or OPA4704UA equivalent, this page provides verified package mapping (SO-14), confirmed quad-channel rail-to-rail I/O behavior, gain-stable performance at G ≥ 5, thermal derating data, and real-world design guidance for capacitive load drive and input overvoltage protection.

Technical Context

The OPA4704UA employs a complementary input stage enabling rail-to-rail common-mode input range extending 300mV beyond supply rails, with output swing to within 40mV of rails under light loads. Its internal compensation is optimized for non-inverting gains of 5 or greater, ensuring stability without external compensation while achieving 3MHz GBW and 3V/µs slew rate - unlike the unity-gain-stable OPA4703 family.

Each amplifier exhibits 120dB open-loop gain (RL = 100kΩ), 90dB CMRR across full input range, and 45nV/√Hz input voltage noise density at 1kHz. Input bias current remains ≤10pA over –40°C to +85°C, supporting high-impedance transducer interfacing without significant error.

Key Specifications

Pinout & Package

OPA4704UA is packaged in a 14-pin SOIC (SO-14) surface-mount package with standard JEDEC MS-012AC footprint, 1.27mm pitch, and 8.65mm × 3.91mm body size. Thermal resistance θ_JA is 100°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4703UA and TLV2464AIDR, the OPA4704UA uniquely balances low quiescent current (160µA), rail-to-rail I/O, and high-speed performance (3MHz/3V/µs) specifically for gain ≥5 signal chains - making it optimal for precision, battery-sensitive, medium-bandwidth applications where unity-gain stability is not required.

Availability

OPA4704UA is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable data acquisition systems, active filter banks, and dual-supply reference buffering requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for OPA4704UA 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 - including OPA4704UA - was designed for rail-to-rail, low-power, high-accuracy signal conditioning in space-constrained, battery-operated, and automotive environments where dynamic range and quiescent current are critical.

FAQ

What is the minimum recommended gain for stable operation of the OPA4704UA?

The OPA4704UA is internally compensated for stable operation only at non-inverting closed-loop gains of 5 or greater. Using it at gains below 5 - such as unity-gain buffer or G = 2 configurations - risks instability, peaking, or oscillation. For lower-gain applications, TI specifies the OPA4703UA as the compatible alternative within the same family and package.

Does the OPA4704UA support rail-to-rail input with input voltages beyond the supply rails?

Yes - the OPA4704UA input stage includes ESD diodes that allow common-mode input voltages from (V–) – 0.3V to (V+) + 0.3V. Voltages exceeding this range are permissible only if input current is limited to ≤10mA, typically via a series resistor. The device exhibits no phase inversion under these overvoltage conditions, preserving signal integrity in fault-tolerant sensor interfaces.

What is the maximum capacitive load the OPA4704UA can drive stably?

The OPA4704UA is characterized to drive up to 1000pF of pure capacitive load stably when configured at G ≥ 5. This capability eliminates external isolation resistors when interfacing directly with SAR ADC input capacitors (typically 10–50pF) or long PCB traces. For loads >1000pF or at lower gains, external compensation or the OPA4703UA is recommended.

How does the OPA4704UA's quiescent current vary with supply voltage and temperature?

OPA4704UA quiescent current is tightly regulated: 160–200µA per amplifier at +25°C across 4V–12V supply range, rising to ≤300µA over the full –40°C to +85°C operating range. This low, predictable current draw enables accurate power budgeting in multi-channel portable systems - e.g., four OPA4704UA channels consume <1.2mA total at room temperature.

Can the OPA4704UA be used with single-supply operation, and what are the implications for output swing?

Yes - the OPA4704UA operates from single supplies of 4V to 12V. With a +5V supply, its rail-to-rail output swings to within 40mV of both 0V and +5V under light loads (100kΩ), delivering >4.92V of usable range. At 20kΩ load, swing degrades to within 75mV of rails - still enabling >4.85V full-scale output for 12-bit+ systems without level-shifting circuitry.