Texas Instruments OPA4343EA/2K5

Overview

OPA4343EA/2K5 from Texas Instruments is a quad rail-to-rail input/output CMOS operational amplifier optimized for low-voltage, single-supply operation (2.5V to 5.5V). It delivers 5.5MHz gain-bandwidth, 6V/µs slew rate, 850µA per amplifier quiescent current, and output swing within 1mV of rails under 100kΩ load - enabling high-fidelity signal conditioning in space-constrained data acquisition and A/D driver circuits.

For engineers reviewing the OPA4343EA/2K5 datasheet, OPA4343EA/2K5 pinout, OPA4343EA/2K5 application, or OPA4343EA/2K5 equivalent, key selection considerations include rail-to-rail dynamic range at 2.7V supply, channel isolation in quad configuration, THD+N of 0.0007% at 1kHz, thermal resistance of 100°C/W in SSOP-16, and compatibility with capacitive loads up to 1000pF in unity-gain.

Technical Context

The OPA4343EA/2K5 employs a complementary CMOS input stage enabling rail-to-rail input common-mode range extending 500mV beyond supply rails, paired with a class AB output stage delivering true rail-to-rail output swing. Its unity-gain stable architecture supports driving sampling A/D converters with minimal settling error (1µs to 0.1%).

All four amplifiers feature fully independent circuitry - no shared bias networks or substrate coupling - ensuring <0.2µV/V dc channel separation and >100dB open-loop gain (RL = 100kΩ) across –40°C to +85°C. Input bias current remains ≤10pA over temperature, critical for high-impedance sensor interfaces.

Key Specifications

Pinout & Package

OPA4343EA/2K5 is packaged in a 16-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, 5.3mm × 6.2mm body size, and 100°C/W junction-to-ambient thermal resistance - optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4343EA/2K5, OPA4342UA/2K5 trades bandwidth for lower noise floor and OPA4343EA/2K5 offers tighter offset and better THD+N than TLV4343IPWR - making OPA4343EA/2K5 optimal for precision, bandwidth-constrained, industrial-temperature data acquisition.

Availability

OPA4343EA/2K5 is available at Aetrix Electronics and suitable for data acquisition systems, portable instrumentation, and PCMCIA card designs requiring stable component supply, RoHS-compliant packaging, and guaranteed industrial-temperature performance.

Supply support for OPA4343EA/2K5 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 OPA4343EA/2K5 belongs to TI's microAmplifier™ series - designed specifically for low-cost, miniature, single-supply applications demanding rail-to-rail performance, low power, and high-speed operation in portable and space-constrained systems.

FAQ

What is the maximum capacitive load the OPA4343EA/2K5 can drive stably in unity-gain configuration?

The OPA4343EA/2K5 can drive up to 1000pF of pure capacitive load while maintaining stability in unity-gain configuration, as verified in TI's SBOS090A datasheet Figure "Small-Signal Overshoot vs Capacitive Load." For loads exceeding this, a 10Ω–20Ω series resistor at the output restores phase margin without significant dc error when RL ≥10kΩ. This capability eliminates need for external compensation in most data acquisition and filter applications.

Does the OPA4343EA/2K5 support true rail-to-rail input common-mode voltage range?

Yes, the OPA4343EA/2K5 supports input common-mode voltage from –0.3V to (V+) + 0.3V - extending 500mV beyond both supply rails. This is achieved via a complementary N-channel/P-channel input stage. However, a 400mV transition region near (V+) – 1.3V may exhibit degraded PSRR and CMRR; design should avoid sustained operation in this zone for precision applications.

What is the thermal resistance (θJA) of the OPA4343EA/2K5 in its SSOP-16 package?

The OPA4343EA/2K5 in SSOP-16 package has a junction-to-ambient thermal resistance (θJA) of 100°C/W, as specified in the SBOS090A datasheet. This value assumes standard JEDEC 2-layer board conditions. With 3.4mA total quiescent current (4 × 0.85mA), self-heating remains under 0.34°C at ambient - well within the –40°C to +85°C operating range without heatsinking.

Can the OPA4343EA/2K5 operate from a 2.5V single supply?

Yes, the OPA4343EA/2K5 is fully specified down to 2.5V single supply, with all key parameters - including 5.5MHz GBW, 6V/µs slew rate, and rail-to-rail output swing - guaranteed across 2.5V to 5.5V. At 2.5V, output swing remains within 5mV of rails under 100kΩ load, enabling direct interfacing with low-voltage ADCs and microcontrollers without level-shifting circuitry.

How does channel separation performance compare between OPA4343EA/2K5 and dual OPA2343EA/2K5?

The OPA4343EA/2K5 achieves <0.2µV/V dc channel separation - identical to the OPA2343EA/2K5 - due to fully independent amplifier cores with no shared bias or substrate paths. TI's SBOS090A confirms that quad and dual versions use the same core design; thus, OPA4343EA/2K5 maintains the same low crosstalk performance as OPA2343EA/2K5, making it suitable for simultaneous multi-channel acquisition where inter-channel interference must be minimized.