Texas Instruments OPA348AIDBVRG4

Overview

OPA348AIDBVRG4 from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply sensor signal conditioning and ADC driver applications. It delivers 1 MHz gain-bandwidth, 45 µA 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 OPA348AIDBVRG4 datasheet, OPA348AIDBVRG4 pinout, OPA348AIDBVRG4 application, or OPA348AIDBVRG4 equivalent, key selection criteria include its ultra-low IQ, rail-to-rail I/O swing within 18 mV of rails (RL = 100 kΩ), 1 MHz unity-gain stability, and validated performance driving 12-bit SAR ADCs like ADS7822 under 5-V single supply.

Technical Context

The OPA348AIDBVRG4 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 18 mV typical headroom into 100 kΩ loads and maintains >94 dB open-loop gain across 2.5 V–5.5 V supply and –40°C to +125°C temperature range.

It is unity-gain stable and capable of directly driving up to 250 pF capacitive loads; stability with larger loads is enhanced via series output resistance or feedback capacitance. Input offset voltage is specified at 1–5 mV (typ/max), with drift of 4 µV/°C over full temperature range.

Key Specifications

Pinout & Package

OPA348AIDBVRG4 is packaged in a 5-pin SOT-23 (DBV) package 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 MCP6001T-E/OT and TLV2461IDBVR, OPA348AIDBVRG4 uniquely balances ultra-low IQ (45 µA), rail-to-rail input *and* output, and 1 MHz bandwidth - making it optimal for battery-critical, rail-sensing applications where neither alternative fully satisfies all three constraints.

Availability

OPA348AIDBVRG4 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 OPA348AIDBVRG4 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 op amps, data converters, and power management ICs.

The OPAx348 product line was designed specifically for ultra-low-power, single-supply signal conditioning in safety-critical portable and industrial sensor systems - emphasizing rail-to-rail operation, nanopower consumption, and extended temperature reliability.

FAQ

What is the maximum capacitive load the OPA348AIDBVRG4 can drive in unity-gain configuration?

The OPA348AIDBVRG4 can directly drive up to 250 pF of pure capacitive load while maintaining stability in unity-gain configuration. For loads exceeding this, a small series resistor (10–20 Ω) between the output and capacitive load improves phase margin without degrading DC accuracy - a technique validated in TI's SBOS213H datasheet Figure 22. This capability makes OPA348AIDBVRG4 well-suited for driving ADC input capacitance and PCB parasitics in compact layouts.

Does the OPA348AIDBVRG4 support true rail-to-rail input operation, and what does that mean for sensor interfacing?

Yes, the OPA348AIDBVRG4 supports true rail-to-rail input operation, with a common-mode voltage range from (V–) – 0.2 V to (V+) + 0.2 V. This means it can accurately amplify sensor signals that swing to within 200 mV of either supply rail - such as outputs from resistive bridge sensors or battery-voltage monitors - without requiring external level-shifting circuitry. This feature directly increases design simplicity and dynamic range utilization in single-supply systems using OPA348AIDBVRG4.

What is the typical input offset voltage drift of the OPA348AIDBVRG4 over temperature, and how does it impact precision applications?

The OPA348AIDBVRG4 has a typical input offset voltage drift of 4 µV/°C over the full –40°C to +125°C operating range. In a precision 12-bit system with 5 V full-scale range (1.22 mV LSB), this drift contributes ≤0.5 LSB error across a 100°C span - making it suitable for applications like CO detection and portable instrumentation where calibration intervals exceed 6 months. The drift specification is guaranteed in the electrical characteristics table of the SBOS213H datasheet.

Can the OPA348AIDBVRG4 be used to drive the ADS7822 12-bit ADC, and what design considerations apply?

Yes, the OPA348AIDBVRG4 is explicitly recommended in TI documentation for driving the ADS7822 12-bit ADC. Key design considerations include: using a 0.1 µF bypass capacitor on V+, placing a 3300 pF RC filter between OPA348AIDBVRG4 output and ADS7822 input to limit noise and settle charge injection, and ensuring the amplifier's 1 MHz bandwidth provides adequate settling (<5 µs, 0.1%) before the ADC's sampling edge. This combination is shown in Figure 24 of SBOS213H.

Is the OPA348AIDBVRG4 pin-compatible with other members of the OPAx348 family, such as OPA2348 or OPA4348?

No, the OPA348AIDBVRG4 is not pin-compatible with OPA2348 or OPA4348. It is a single-channel device in a 5-pin SOT-23 (DBV) package, whereas OPA2348 uses an 8-pin SOT-23 or SOIC package and OPA4348 uses 14-pin SOIC or TSSOP packages. Pin assignments differ fundamentally - for example, OPA348AIDBVRG4 places V+ on pin 5 and V– on pin 2, while dual and quad variants allocate dedicated pins for each channel's inputs and outputs. Board layout must be specific to the OPA348AIDBVRG4 footprint.