Texas Instruments OPA4348AIPWRG4

Overview

OPA4348AIPWRG4 from Texas Instruments is a quad, 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 OPA4348AIPWRG4 datasheet, OPA4348AIPWRG4 pinout, OPA4348AIPWRG4 application, or OPA4348AIPWRG4 equivalent, key selection criteria include its extended common-mode range (V– – 0.2 V to V+ + 0.2 V), 18 mV output swing from rail (RL = 100 kΩ), 70 dB minimum CMRR, and TSSOP-14 package compatibility with space-constrained PCB layouts.

Technical Context

The OPA4348AIPWRG4 employs a complementary N/P-channel input stage enabling rail-to-rail input operation across –40°C to +125°C, with input common-mode voltage extending 200 mV beyond both supply rails. Its class AB output stage supports rail-to-rail output swing while maintaining >94 dB open-loop gain at 100 kΩ load.

It is unity-gain stable and specified for capacitive loads up to 250 pF in buffer configuration. The device features no phase inversion when inputs exceed supply rails (with current limiting), and exhibits 4 µV/°C typical offset drift over temperature - critical for precision DC-coupled sensing paths.

Key Specifications

Pinout & Package

OPA4348AIPWRG4 is packaged in a 14-pin TSSOP (PW) with 5.00 mm × 4.40 mm body size and 0.65 mm lead pitch. This thermally enhanced, surface-mount package supports automated assembly and offers R_θJA = 121°C/W for moderate power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4348AIPWRG4, the OPA4348AIPW offers superior thermal resistance but requires more PCB area, while the MCP6004-E/ST trades 22× lower quiescent current for 1000× reduced bandwidth and degraded DC precision - making it unsuitable for ADC driving or fast sensor response.

Availability

OPA4348AIPWRG4 is available at Aetrix Electronics and suitable for smoke alarm manufacturing, portable medical device development, and industrial sensor module production requiring stable component supply and long-term lifecycle support.

Supply support for OPA4348AIPWRG4 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 OPAx348 product line was designed specifically for battery-powered, single-supply sensor interfaces demanding rail-to-rail operation, nanoampere input bias, and extended temperature reliability - targeting safety-critical and portable instrumentation markets.

FAQ

What is the maximum capacitive load the OPA4348AIPWRG4 can drive in unity-gain configuration?

The OPA4348AIPWRG4 can directly drive up to 250 pF of pure capacitive load while maintaining stability in unity-gain buffer configuration. For loads exceeding this value, a small series resistor (10–20 Ω) between the output and capacitive node restores phase margin without degrading DC accuracy - a technique validated in TI's SBOS213H datasheet Figure 22. This capability makes OPA4348AIPWRG4 suitable for driving ADC input capacitance and PCB trace capacitance in compact sensor nodes.

Does the OPA4348AIPWRG4 support true rail-to-rail input when powered from 2.1 V?

Yes, the OPA4348AIPWRG4 maintains rail-to-rail input operation down to 2.1 V supply, with common-mode voltage range specified from (V–) – 0.2 V to (V+) + 0.2 V across the full –40°C to +125°C temperature range. At 2.1 V, this translates to –0.2 V to +2.3 V input range - verified in Electrical Characteristics Table 6.7 and Feature Description Section 7.3.3. This ensures compatibility with low-voltage microcontrollers and energy-harvesting systems.

Can the OPA4348AIPWRG4 replace the OPA2348 in a dual-amplifier design without layout changes?

No - the OPA4348AIPWRG4 is a 14-pin TSSOP device with four independent amplifiers, while the OPA2348 is an 8-pin package (SOIC/SOT/VSSOP) with two channels. Pin count, pinout, and footprint are incompatible. Direct replacement would require PCB redesign. However, two OPA2348 channels can be functionally matched by using two of the four OPA4348AIPWRG4 amplifiers - leaving the remaining two channels available for future expansion or redundancy.

What is the typical input offset voltage drift of the OPA4348AIPWRG4 over temperature?

The OPA4348AIPWRG4 has a typical input offset voltage drift of 4 µV/°C over the full –40°C to +125°C operating range, as specified in Table 6.7 of the SBOS213H datasheet. This low drift ensures minimal baseline shift in precision DC-coupled applications such as gas sensor amplification or RTD signal conditioning, reducing calibration frequency and improving long-term measurement stability without active compensation.

Is the OPA4348AIPWRG4 pin-compatible with other members of the OPAx348 family?

No - the OPA4348AIPWRG4 (14-pin TSSOP) is not pin-compatible with the OPA348 (5- or 8-pin) or OPA2348 (8-pin) variants due to differing channel counts and package footprints. However, all OPAx348 devices share identical electrical specifications, pin functions per channel, and recommended operating conditions. Layout reuse is possible only at the schematic level (channel-level net naming), not at the physical footprint level.