Texas Instruments OPA348AIDBVR

Overview

OPA348AIDBVR from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply systems. It delivers 1 MHz gain-bandwidth, 45 µA quiescent current, and 0.5 pA input bias current, enabling precision signal conditioning in battery-powered smoke alarms and CO detectors with supply voltages from 2.1 V to 5.5 V.

For engineers reviewing the OPA348AIDBVR datasheet, OPA348AIDBVR pinout, OPA348AIDBVR application, or OPA348AIDBVR equivalent, key selection criteria include its extended common-mode range (–0.2 V to V_S + 0.2 V), 18 mV output swing from rail at light load, and validated performance driving 12-bit ADCs like ADS7822 in portable sensor front-ends.

Technical Context

The OPA348AIDBVR uses a complementary N/P-channel input stage to achieve rail-to-rail input operation across –0.2 V to V_S + 0.2 V, with a 200 mV transition region where both pairs conduct. Its class AB output stage supports rail-to-rail output swing within 18 mV of rails under 100 kΩ load while maintaining >94 dB open-loop gain.

It is unity-gain stable and drives up to 250 pF capacitive loads directly; stability with larger loads is enhanced by series output resistance or feedback capacitance. Input offset voltage is specified at 1–5 mV (typ/max) over temperature, and PSRR/CMRR remain ≥60 dB up to 1 kHz.

Key Specifications

Pinout & Package

OPA348AIDBVR is packaged in a 5-pin SOT-23 (DBV) case measuring 2.90 mm × 1.60 mm, optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA333AIDBVR and MCP6001UT-E/OT, OPA348AIDBVR uniquely balances 1 MHz bandwidth, 45 µA quiescent current, and 0.5 pA input bias-making it optimal for battery-powered sensor front-ends where both AC response and DC precision matter.

Availability

OPA348AIDBVR is available at Aetrix Electronics and suitable for smoke detector manufacturing, CO sensor module assembly, and portable medical device production requiring stable component supply and long-term lifecycle support.

Supply support for OPA348AIDBVR 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 chains.

The OPAx348 product line was designed specifically for ultra-low-power, single-supply sensor interface applications-including safety-critical devices like smoke and carbon monoxide detectors-where rail-to-rail operation, nanoamp input bias, and extended temperature range are essential.

FAQ

What is the maximum capacitive load the OPA348AIDBVR can drive in unity-gain configuration?

The OPA348AIDBVR can directly drive up to 250 pF of pure capacitive load while maintaining stability in unity-gain configuration. For loads exceeding this value, a small series resistor (10–20 Ω) between the output and capacitive load improves phase margin without compromising DC accuracy. This capability is validated in TI's SBOS213H datasheet Figure 13 and supports reliable interfacing with 12-bit ADCs like ADS7822 that present significant input capacitance during sampling.

Does the OPA348AIDBVR support true rail-to-rail input when powered from 2.1 V?

Yes, the OPA348AIDBVR maintains rail-to-rail input operation from –0.2 V to V_S + 0.2 V across its full 2.1 V to 5.5 V supply range. At 2.1 V supply, this means the input common-mode range extends from –0.2 V to +2.3 V, enabling compatibility with sensors whose outputs swing near ground or the positive rail-even at minimum operating voltage. This behavior is confirmed in Section 6.7 of the SBOS213H datasheet under "INPUT VOLTAGE RANGE" specifications.

What is the typical input offset voltage drift of the OPA348AIDBVR over temperature?

The typical input offset voltage drift of the OPA348AIDBVR is 4 µV/°C over the full –40°C to +125°C operating range, as specified in the Electrical Characteristics table (Section 6.7) of the SBOS213H datasheet. This drift value applies under standard test conditions (V_S = 5 V, V_CM = V– + 0.8 V) and is critical for DC-coupled sensor applications such as CO gas detection, where long-term calibration stability impacts field reliability. Production distribution data in Figure 12 further confirms <12 µV/°C for 99.9% of units.

Can the OPA348AIDBVR be used to drive an ADS7822 12-bit ADC?

Yes, the OPA348AIDBVR is explicitly recommended in TI documentation for driving the ADS7822 12-bit ADC. Its 1 MHz bandwidth, 250 pF capacitive load drive, rail-to-rail output swing (within 18 mV of rails), and low 0.0023% THD+N at 1 kHz ensure accurate, low-distortion sampling. The application schematic on page 16 of SBOS213H shows OPA348 directly buffering ADS7822's analog input, confirming its suitability for this precise timing- and accuracy-sensitive interface.

Is the OPA348AIDBVR pin-compatible with other members of the OPAx348 family?

No, the OPA348AIDBVR (5-pin SOT-23) is not pin-compatible with OPA2348 or OPA4348, which use 8-pin and 14-pin packages respectively. Within the OPA348 variant, only the 5-pin SC70 (DCK) and 5-pin SOT-23 (DBV) share identical pinouts; the 8-pin SOIC (D) version has different pin assignments (e.g., NC pins at 1,5,8). Always verify pin mapping using the "Pin Functions: OPA348" table on page 3 of SBOS213H before board layout.