Texas Instruments OPA4344UA

Overview

OPA4344UA from Texas Instruments is a quad, rail-to-rail input/output, single-supply CMOS operational amplifier optimized for precision low-power applications. It delivers 1 MHz gain-bandwidth, 0.8 V/µs slew rate, ±1 mV max input offset voltage, 150 µA typical quiescent current per amplifier, and operates from 2.7 V to 5.5 V. It is used in data acquisition front-ends driving sampling ADCs such as the ADS7822.

For engineers reviewing the OPA4344UA datasheet, OPA4344UA pinout, OPA4344UA application, or OPA4344UA equivalent, key selection criteria include rail-to-rail I/O swing within 1 mV of rails, unity-gain stability, THD+N of 0.006% at 1 kHz, microamp-level quiescent current, and TSSOP-14/SO-14 package compatibility for space-constrained PCB layouts.

Technical Context

The OPA4344UA employs a complementary CMOS input stage enabling rail-to-rail input common-mode range extending 300 mV beyond both supply rails, with a transition region near (V+) – 1.3 V where both N- and P-channel pairs operate. Its class AB output stage achieves rail-to-rail output swing-within 1 mV of rails under light loads (100 kΩ) and ≤400 mV under 5 kΩ loads while maintaining ≥96 dB open-loop gain.

It is unity-gain stable and specified over –40°C to +85°C. Input bias current is ultra-low (±10 pA max), input voltage noise is 30 nV/√Hz at 10 kHz, and CMRR exceeds 76 dB across its full common-mode range. Channel separation is 130 dB at 1 kHz, supporting high-fidelity multi-channel signal conditioning.

Key Specifications

Pinout & Package

OPA4344UA is available in SO-14 (package drawing D) and TSSOP-14 (PW). The SO-14 variant uses standard 0.150" wide body with 0.050" pitch; thermal resistance θ_JA = 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 OPA4344EA, the OPA4344UA offers identical performance in a standard SO-14 package for easier prototyping and legacy board compatibility; versus TLV2464AIDR, it trades bandwidth for 3.7× lower quiescent current-critical for energy-harvesting and coin-cell applications.

Availability

OPA4344UA is available at Aetrix Electronics and suitable for industrial process control, portable data acquisition, and audio signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA4344UA 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 low-power signal chain solutions.

The OPA344/4344 family was designed for miniature, single-supply, rail-to-rail precision applications-including data acquisition, sensor interfaces, and portable instrumentation-where ultra-low quiescent current and wide dynamic range are mandatory.

FAQ

What is the maximum operating supply voltage for the OPA4344UA?

The OPA4344UA has an absolute maximum supply voltage of 7.5 V between V+ and V–, but its specified operating range is 2.7 V to 5.5 V. Operation outside this range may cause parametric degradation or reliability risk. For reliable long-term use, maintain VS within 2.7 V–5.5 V, as validated in the SBOS107A datasheet across –40°C to +85°C.

Is the OPA4344UA unity-gain stable?

Yes, the OPA4344UA is explicitly unity-gain stable, unlike the OPA4345 series which requires minimum gain ≥5. This allows direct use in voltage followers, active filters, and I/V converters without external compensation components-reducing BOM count and layout complexity in designs using the OPA4344UA.

What is the input common-mode voltage range of the OPA4344UA?

The OPA4344UA supports an input common-mode voltage range from –0.3 V to (V+) + 0.3 V, extending 300 mV beyond both supply rails. This rail-to-rail input capability enables direct interfacing with sensors whose output swings below ground or above V+, provided input current is limited to ≤10 mA per terminal as specified in the absolute maximum ratings.

Can the OPA4344UA drive capacitive loads?

The OPA4344UA can directly drive up to 250 pF capacitive loads in unity-gain configuration while maintaining stability. For larger loads or improved phase margin, a 10 Ω–20 Ω series resistor (RS) between output and load is recommended-this preserves DC accuracy for purely capacitive loads and reduces ringing without requiring feedback network changes in the OPA4344UA circuit.

How does the OPA4344UA compare to the OPA4345UA in terms of bandwidth and stability?

The OPA4344UA has a 1 MHz gain-bandwidth product and is unity-gain stable, whereas the OPA4345UA offers 3 MHz GBW but requires minimum closed-loop gain ≥5 for stability. Thus, the OPA4344UA is preferred for low-frequency precision buffering and filtering, while the OPA4345UA suits higher-speed, fixed-gain signal paths-both share identical quiescent current, rail-to-rail I/O, and package options.