Texas Instruments OPA4348AIPWT

Overview

OPA4348AIPWT from Texas Instruments is a quad-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply sensor signal conditioning and ADC driving. It delivers 1 MHz gain-bandwidth, 45 µA per amplifier quiescent current, 0.5 pA input bias current, and operates from 2.1 V to 5.5 V - enabling use in battery-powered smoke alarms, CO detectors, and portable medical instrumentation.

For engineers reviewing the OPA4348AIPWT datasheet, OPA4348AIPWT pinout, OPA4348AIPWT application, or OPA4348AIPWT equivalent, key selection criteria include its 14-pin TSSOP package, guaranteed –40°C to +125°C operation, rail-to-rail input beyond supply rails (±0.2 V), and output swing within 25 mV of rails under light load - critical for precision, low-voltage analog front-ends.

Technical Context

The OPA4348AIPWT employs a complementary N/P-channel input stage enabling rail-to-rail common-mode input range from (V–) – 0.2 V to (V+) + 0.2 V. Its class-AB output stage supports rail-to-rail output swing with <25 mV headroom at 100 kΩ load and maintains unity-gain stability up to 250 pF capacitive load.

Designed for single-supply systems, it features ultra-low input bias current (0.5 pA typ) and low offset voltage drift (4 µV/°C max), making it suitable for high-impedance sensor interfaces such as electrochemical gas sensors and photodiode transimpedance stages where leakage and thermal drift directly impact accuracy.

Key Specifications

Pinout & Package

OPA4348AIPWT is housed in a 14-pin TSSOP (PW) package measuring 5.00 mm × 4.40 mm, optimized for compact, thermally efficient PCB layouts in space-constrained portable devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4348AIPWT, the OPA4348AIDR offers identical performance in a larger SOIC package better suited for manual assembly, while the MCP6004-E/ST trades 2.2× higher power and reduced input impedance for broader voltage range and multi-source availability - making OPA4348AIPWT optimal for size- and power-critical safety applications.

Availability

OPA4348AIPWT is available at Aetrix Electronics and suitable for smoke detector manufacturing, portable medical device production, and industrial gas sensor module assembly requiring stable component supply and long-term lifecycle support.

Supply support for OPA4348AIPWT 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 amplifiers and low-power signal-chain solutions.

The OPAx348 product line was designed specifically for ultra-low-power, single-supply sensor interface applications - emphasizing rail-to-rail operation, femtoampere input bias, and extended temperature reliability in safety-critical end equipment.

FAQ

What is the maximum capacitive load the OPA4348AIPWT can drive in unity-gain configuration?

The OPA4348AIPWT can directly drive up to 250 pF of pure capacitive load while maintaining stability in unity-gain configuration, as verified in TI's SBOS213H datasheet Figure 13. For loads exceeding this, a 10–20 Ω series resistor at the output restores phase margin without degrading DC accuracy - a technique validated in Application Note SLOA099. This capability simplifies anti-aliasing filter implementation in OPA4348AIPWT-based data acquisition systems.

Does the OPA4348AIPWT support true rail-to-rail input, including beyond the supply rails?

Yes, the OPA4348AIPWT supports rail-to-rail input from (V–) – 0.2 V to (V+) + 0.2 V, confirmed in Section 6.7 Electrical Characteristics and Feature Description 7.3.3 of the SBOS213H datasheet. This extended range eliminates external level-shifting circuitry when interfacing with sensors whose output swings slightly below ground or above V+. Input protection diodes are not integrated, so external current limiting remains necessary for voltages exceeding ±0.5 V beyond rails.

What is the operating temperature range specified for the OPA4348AIPWT?

The OPA4348AIPWT is fully specified and tested across –40°C to +125°C, as stated in Section 6.3 Recommended Operating Conditions and Device Information tables of the SBOS213H datasheet. This extended range applies to all key parameters including input offset voltage, PSRR, CMRR, and quiescent current - enabling reliable deployment in automotive, industrial, and building safety applications where ambient extremes are routine.

Can the OPA4348AIPWT be used to drive the ADS7822 12-bit ADC as shown in the TI reference schematic?

Yes, the OPA4348AIPWT is explicitly qualified for driving the ADS7822 12-bit ADC, as demonstrated in TI's reference design (page 16, Figure 24) and Application Section 8.1.1. Its 1 MHz bandwidth, low output impedance, and ability to settle within 5 µs (0.1% settling time) ensure full 12-bit accuracy during ADS7822's conversion window. The OPA4348AIPWT's rail-to-rail output swing also matches the ADS7822's 0–VREF input range without attenuation or clipping.

What is the input bias current specification for the OPA4348AIPWT, and why does it matter in sensor applications?

The OPA4348AIPWT has a typical input bias current of 0.5 pA, with a maximum of ±10 pA over temperature, per Section 6.7 Electrical Characteristics. This ultra-low value prevents significant voltage error across high-impedance sources - for example, a 1 GΩ sensor produces only 0.5 mV offset. In smoke and CO detectors using electrochemical cells or photodiodes, this ensures measurement fidelity without active guarding or frequent recalibration, directly supporting UL 217 and EN 50291 compliance.