Texas Instruments OPA4344UAG4

Overview

OPA4344UAG4 from Texas Instruments is a quad, rail-to-rail input/output CMOS operational amplifier optimized for precision, low-power, single-supply operation from 2.7V to 5.5V. It delivers 1MHz gain-bandwidth, 0.8V/µs slew rate, ±1mV max input offset voltage, 150µA typical quiescent current per amplifier, and 1mV output swing from rail into 100kΩ - ideal for driving SAR ADC inputs in portable data acquisition systems.

For engineers reviewing the OPA4344UAG4 datasheet, OPA4344UAG4 pinout, OPA4344UAG4 application, or OPA4344UAG4 equivalent, key selection criteria include unity-gain stability, rail-to-rail dynamic range at low supply voltage, THD+N of 0.006% at 1kHz, and guaranteed operation across –40°C to +85°C in SOIC-14 packaging.

Technical Context

The OPA4344UAG4 implements a complementary CMOS input stage enabling rail-to-rail common-mode input range extending 300mV beyond both supply rails, with a 400mV transition region where both N- and P-channel pairs are active. Its class AB output stage achieves 1mV output swing from rail under light loads while maintaining ≥96dB open-loop gain.

Designed for unity-gain stability, it features 1MHz GBW and 0.8V/µs slew rate - optimized for low-noise signal conditioning (8µVrms integrated noise, 30nV/√Hz at 10kHz) and high-precision I/V conversion at DAC outputs without phase margin compromise.

Key Specifications

Pinout & Package

OPA4344UAG4 is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package with standard JEDEC MS-012AC footprint (5.3mm × 10.2mm), RoHS-compliant NiPdAu lead finish, and MSL Level-2 moisture sensitivity rating.

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, OPA4344UAG4 offers identical performance with enhanced process control for lead-free assembly; versus MCP6004-E/ST, it delivers superior precision (3× tighter offset), verified audio-linearity, and guaranteed rail-to-rail output swing - justifying selection where signal integrity is non-negotiable.

Availability

OPA4344UAG4 is available at Aetrix Electronics and suitable for PCMCIA data acquisition cards, speech bandpass filter systems, and process control loop sensor interfaces requiring stable component supply across industrial temperature ranges and long-term production continuity.

Supply support for OPA4344UAG4 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 over 90 years of innovation in precision signal chain solutions.

The OPA344/4344 family belongs to TI's MicroAmplifier™ series - designed specifically for low-power, miniature, single-supply applications demanding rail-to-rail performance, unity-gain stability, and guaranteed operation from –40°C to +85°C.

FAQ

What is the maximum operating supply voltage for OPA4344UAG4?

The OPA4344UAG4 has an absolute maximum supply voltage of 7.5V between V+ and V– pins. However, its specified operating range is 2.7V to 5.5V - performance parameters including gain-bandwidth, offset voltage, and output swing are guaranteed only within this range. Exceeding 5.5V may cause parametric shift or reliability degradation, even if the device remains functional.

Is OPA4344UAG4 unity-gain stable?

Yes, the OPA4344UAG4 is explicitly unity-gain stable as confirmed in the official SBOS107A datasheet. It is part of the OPA344 series (not the OPA345 series, which requires G ≥ 5). This allows direct use in voltage follower, active filter, and ADC driver configurations without external compensation networks - a key differentiator from higher-speed alternatives.

What is the thermal resistance θJA for OPA4344UAG4 in SOIC-14 package?

The junction-to-ambient thermal resistance (θJA) for OPA4344UAG4 in SOIC-14 package is 100°C/W, as specified in the SBOS107A datasheet. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad). At 600µA total quiescent current (150µA × 4), self-heating is limited to ~0.06°C - well within safe operating limits for –40°C to +85°C ambient operation.

Does OPA4344UAG4 support rail-to-rail input common-mode voltage?

Yes, OPA4344UAG4 supports rail-to-rail input with a common-mode voltage range of –0.3V to (V+) + 0.3V - extending 300mV beyond both supply rails. This is achieved via a complementary N/P-channel input stage. Note that PSRR, CMRR, and offset may degrade within the 400mV internal transition region near (V+) – 1.5V, so critical precision applications should avoid biasing inputs in that zone.

Can OPA4344UAG4 drive capacitive loads directly?

OPA4344UAG4 can directly drive up to 250pF capacitive loads in unity-gain configuration while maintaining stability, as verified in the SBOS107A datasheet. For larger loads or improved phase margin, a 10Ω–20Ω series resistor at the output (RS) is recommended - this preserves DC accuracy for purely capacitive loads but introduces negligible error (<0.2%) when RL > 5kΩ is present.