Texas Instruments OPA4348AIPWR

Overview

OPA4348AIPWR from Texas Instruments is a quad, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply operation across 2.1 V to 5.5 V. It delivers 1 MHz gain-bandwidth, 45 µA per amplifier quiescent current, 0.5 pA input bias current, and operates over –40°C to +125°C - enabling precision signal conditioning in battery-powered smoke alarms and CO detectors.

For engineers reviewing the OPA4348AIPWR datasheet, OPA4348AIPWR pinout, OPA4348AIPWR application, or OPA4348AIPWR equivalent, key selection criteria include its rail-to-rail I/O swing (within 18 mV of rails at light load), ultra-low input bias current for high-impedance sensor interfacing, and guaranteed unity-gain stability with capacitive loads up to 250 pF.

Technical Context

The OPA4348AIPWR uses a complementary N/P-channel input stage to achieve rail-to-rail input common-mode range extending 200 mV beyond both supply rails. Its class AB output stage enables rail-to-rail output swing while maintaining >94 dB open-loop gain into 100 kΩ loads.

It features a unity-gain stable architecture with 1 MHz bandwidth and 0.5 V/µs slew rate, supporting accurate buffering of ADC inputs (e.g., ADS7822) and low-distortion amplification of electret microphone signals in portable safety equipment.

Key Specifications

Pinout & Package

OPA4348AIPWR is housed in a 14-pin TSSOP package (5.00 mm × 4.40 mm body size), optimized for space-constrained PCB layouts in portable safety devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4348IPW and MCP6004-E/ST, the OPA4348AIPWR uniquely combines 0.5 pA input bias current, 45 µA quiescent current, and 14-pin TSSOP packaging - making it optimal for space- and power-constrained safety-critical analog front-ends where sensor fidelity and battery longevity are paramount.

Availability

OPA4348AIPWR is available at Aetrix Electronics and suitable for smoke detector manufacturing, CO sensor module production, and portable medical device development requiring stable component supply and long-term lifecycle support.

Supply support for OPA4348AIPWR 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers and low-power signal chain solutions.

The OPAx348 product line was designed specifically for ultra-low-power, rail-to-rail signal conditioning in battery-operated safety and environmental monitoring systems - emphasizing input bias current, supply current, and extended temperature performance.

FAQ

What is the maximum capacitive load the OPA4348AIPWR can drive in unity-gain configuration?

The OPA4348AIPWR is unity-gain stable and can directly drive up to 250 pF of pure capacitive load without external compensation. This capability is verified in the datasheet's Typical Characteristics section (Figure 13). For loads exceeding 250 pF, a small series resistor (10–20 Ω) between the output and capacitive node restores stability while preserving DC accuracy. The OPA4348AIPWR's internal compensation eliminates the need for external poles in standard sensor-buffering applications.

Does the OPA4348AIPWR support true rail-to-rail input operation below ground or above V+?

Yes - the OPA4348AIPWR's input common-mode voltage range extends from (V–) – 0.2 V to (V+) + 0.2 V, enabling valid operation 200 mV beyond both supply rails. This is achieved via a complementary N/P-channel input stage. Inputs within this extended range maintain specified PSRR, CMRR, and offset performance. The absolute maximum rating allows transient excursions to (V–) – 0.5 V and (V+) + 0.5 V, provided input current is limited to ≤10 mA, as documented in Section 6.1 of the OPA4348AIPWR datasheet.

What is the typical input offset voltage drift of the OPA4348AIPWR over temperature?

The OPA4348AIPWR has a typical input offset voltage drift of 4 µV/°C across the full operating temperature range of –40°C to +125°C. This value is specified in the Electrical Characteristics table (Section 6.7) under "dVOS/dT". It reflects the worst-case drift observed in production units and ensures stable DC accuracy in temperature-varying environments such as automotive cabins or outdoor safety enclosures - critical for gas sensor baselines and medical sensor calibration.

Can the OPA4348AIPWR operate from a 2.1 V supply while maintaining full rail-to-rail output swing?

Yes - the OPA4348AIPWR is fully specified and tested down to 2.1 V supply voltage. At 2.1 V, it maintains rail-to-rail output swing within 25 mV of both rails (V– and V+) under light load (100 kΩ), as confirmed in the Electrical Characteristics table. Its CMOS input stage remains functional across the entire 2.1 V to 5.5 V range, and all parameters - including gain-bandwidth (1 MHz) and quiescent current (45 µA) - are guaranteed at minimum supply. This makes the OPA4348AIPWR ideal for single-cell Li-ion or alkaline-powered systems.

How does the OPA4348AIPWR compare to the OPA2348 in terms of channel count and package compatibility?

The OPA4348AIPWR integrates four independent amplifiers in a 14-pin TSSOP package, whereas the OPA2348 contains two amplifiers in 8-pin SOT-23, VSSOP, or SOIC packages. Pinouts are not compatible - the OPA4348AIPWR uses dedicated pins for each channel's inputs and outputs plus shared V+ and V–, unlike the OPA2348's compact dual-channel layout. Designers upgrading from dual to quad functionality must revise PCB layout; however, electrical behavior (GBW, IQ, rail-to-rail I/O) is consistent across the OPAx348 family, simplifying firmware and schematic reuse.