Texas Instruments OPA4344PA

Overview

OPA4344PA from Texas Instruments is a quad, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply precision applications. It delivers 1MHz gain-bandwidth, 0.8V/µs slew rate, ±1mV max input offset voltage, 150µA typical quiescent current per amplifier, and output swing within 1mV of rails under light load - enabling high-fidelity signal conditioning in PCMCIA cards and data acquisition front-ends.

For engineers reviewing the OPA4344PA datasheet, OPA4344PA pinout, OPA4344PA application, or OPA4344PA equivalent, key selection criteria include its unity-gain stability, –40°C to +85°C temperature rating, 2.7V–5.5V supply range, rail-to-rail I/O performance, and suitability for driving SAR ADC inputs with minimal settling error and THD+N of 0.006% at 1kHz.

Technical Context

The OPA4344PA implements a complementary differential input stage (N-channel + P-channel pairs) enabling rail-to-rail common-mode input range extending 300mV beyond both supply rails. Its class AB output stage achieves 1mV rail-to-rail swing into 100kΩ loads while maintaining ≥96dB open-loop gain.

Designed for unity-gain stability, it features a 1MHz gain-bandwidth product and 0.8V/µs slew rate - optimized for low-noise (<30nV/√Hz), low-distortion (0.006% THD+N), and low-input-bias-current (±10pA max) operation across 2.7V–5.5V supplies.

Key Specifications

Pinout & Package

OPA4344PA is supplied in a 14-pin plastic dual in-line package (PDIP-N), through-hole mountable with 0.300" wide body and standard 0.1" pin pitch. Pin 7 is V– (ground reference), Pin 4 is V+ (positive supply), and each amplifier shares dedicated input/output terminals as defined below.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4344UA and OPA4344EA, the OPA4344PA offers through-hole mechanical robustness and simplified prototyping, while retaining identical precision, speed, and power characteristics - making it optimal for lab validation, industrial control modules, and legacy-compatible upgrades.

Availability

OPA4344PA is available at Aetrix Electronics and suitable for PCMCIA cards, industrial process monitoring, audio pre-amplifiers, and active filter banks requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA4344PA 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The OPA4344PA belongs to TI's MicroAmplifier™ series - engineered specifically for low-power, single-supply, rail-to-rail precision signal conditioning in space- and energy-constrained applications.

FAQ

What supply voltage range does the OPA4344PA support?

The OPA4344PA operates from 2.7V to 5.5V single supply, with guaranteed specifications over this range at –40°C to +85°C. It can tolerate up to 7.5V between V+ and V–, but functional performance is only ensured within the 2.7V–5.5V window. The OPA4344PA draws just 150µA per amplifier at 5.5V, enabling efficient operation in battery-powered instrumentation.

Is the OPA4344PA unity-gain stable?

Yes, the OPA4344PA is explicitly unity-gain stable and requires no external compensation. This is confirmed in the Applications Information section of the SBOS107A datasheet, which states "OPA344 series op amps are unity gain stable." As the quad variant of the OPA344 family, the OPA4344PA inherits this property - making it ideal for voltage followers, active filters, and ADC driver configurations without risk of oscillation.

What is the maximum output swing capability of the OPA4344PA?

The OPA4344PA delivers rail-to-rail output swing: within 1mV of V+ and V– when loaded with ≥100kΩ, and within 40mV under 5kΩ loads while maintaining ≥96dB open-loop gain. This performance is validated across the full –40°C to +85°C temperature range and enables full utilization of 3.3V or 5V ADC input ranges without level-shifting circuitry.

How does the OPA4344PA handle input voltages beyond the supply rails?

The OPA4344PA input common-mode range extends –0.3V below V– and up to (V+) + 0.3V. Inputs exceeding –0.3V below V– (e.g., negative transients in single-supply systems) may cause output lock-up. TI recommends using a Schottky diode clamp (e.g., IN5818) with a 1kΩ series resistor if such excursions are possible - a protection method explicitly detailed in Figure 4 of the SBOS107A datasheet for the OPA4344PA.

Can the OPA4344PA drive capacitive loads directly?

The OPA4344PA can directly drive up to 250pF capacitive loads in unity-gain configuration while maintaining stability. For larger loads or improved phase margin, TI recommends adding a 10Ω–20Ω series resistor (RS) between the output and capacitive node - a technique validated in Figure 5 of SBOS107A. This preserves DC accuracy for purely capacitive loads and minimizes ringing in ADC sample-and-hold or filter applications involving the OPA4344PA.