Texas Instruments OPA348AIDBVT

Overview

OPA348AIDBVT from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply applications. It delivers 1 MHz gain-bandwidth, 45 µA quiescent current, and 0.5 pA input bias current, operating from 2.1 V to 5.5 V. It serves as an ADC input driver in portable sensor interfaces-e.g., smoke alarms and CO detectors-where ultra-low power and high-impedance signal conditioning are critical.

For engineers reviewing the OPA348AIDBVT datasheet, OPA348AIDBVT pinout, OPA348AIDBVT application, or OPA348AIDBVT equivalent, key selection criteria include its 18 mV output swing from rail (RL = 100 kΩ), ±0.5 pA input bias current enabling high-Z sensor interfacing, rail-to-rail input extending 200 mV beyond supplies, and SC70-5 package suitability for space-constrained battery-powered designs.

Technical Context

The OPA348AIDBVT uses a complementary N/P-channel input stage to achieve rail-to-rail input operation across –0.2 V to +5.7 V at 5.5 V supply, with a 200 mV transition region where both pairs conduct. Its folded-cascode gain stage and class-AB output stage deliver unity-gain stability and 0.5 V/µs slew rate while maintaining 94 dB open-loop gain at 5 V.

Designed for direct ADC driving, it buffers sampling capacitance and suppresses charge injection-induced errors via low input bias current and fast overload recovery (1.6 µs). Its 10 nV/√Hz input voltage noise density and 4 fA/√Hz current noise support precision DC-coupled sensor front-ends without degrading SNR in 12-bit systems like ADS7822.

Key Specifications

Pinout & Package

OPA348AIDBVT is packaged in a 5-pin SC70 (DCK) case measuring 2.00 mm × 1.25 mm, optimized for ultra-compact PCB layouts in portable equipment.

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, OPA348AIDBVT uniquely combines SC70-5 packaging, 0.5 pA input bias current, and true rail-to-rail input extending 200 mV beyond supplies-making it irreplaceable for high-precision, ultra-low-power sensor buffering where layout area and leakage current are critical.

Availability

OPA348AIDBVT is available at Aetrix Electronics and suitable for smoke alarm manufacturing, portable CO detector production, and battery-powered medical device development requiring stable component supply and long-term lifecycle assurance.

Supply support for OPA348AIDBVT 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 chains.

The OPAx348 product line was engineered specifically for single-supply, ultra-low-power sensor interface applications-including safety-critical portable instrumentation-where rail-to-rail operation, femtoamp input bias, and extended temperature performance are mandatory.

FAQ

What is the maximum capacitive load the OPA348AIDBVT can drive in unity-gain configuration?

The OPA348AIDBVT can directly drive up to 250 pF of pure capacitive load while maintaining stability in unity-gain configuration. For loads exceeding this, a 10–20 Ω series resistor at the output improves phase margin without degrading DC accuracy. This capability is validated per Figure 13 in the SBOS213H datasheet and enables direct connection to ADC input capacitance (e.g., ADS7822) without external isolation components. The OPA348AIDBVT's internal compensation ensures robustness across process and temperature variations.

Does the OPA348AIDBVT support input voltages beyond the supply rails?

Yes-the OPA348AIDBVT features a rail-to-rail input stage that operates from (V−) − 0.2 V to (V+) + 0.2 V, allowing valid signal acquisition 200 mV beyond both supply rails. Inputs up to (V−) − 0.5 V or (V+) + 0.5 V are safe if current-limited to ≤10 mA. This eliminates level-shifting circuitry in applications like electret microphone biasing or sensor outputs referenced to external grounds. The OPA348AIDBVT's complementary N/P-channel input architecture enables this extended range without phase inversion.

What is the typical output voltage swing of the OPA348AIDBVT at 5 V supply with 100 kΩ load?

At 5 V supply and 100 kΩ load, the OPA348AIDBVT delivers a typical output swing within 18 mV of each rail-i.e., 0.018 V to 4.982 V-while maintaining ≥94 dB open-loop gain. This rail-to-rail performance maximizes dynamic range for 12-bit ADCs such as ADS7822, ensuring full utilization of the 0–5 V input range. Data is confirmed in Section 6.7 "Electrical Characteristics" of SBOS213H, Table 1, under "Voltage output swing from rail" test condition RL = 100 kΩ, AOL > 94 dB.

How does the OPA348AIDBVT perform in high-temperature industrial environments?

The OPA348AIDBVT is fully specified from −40°C to +125°C, with key parameters including input offset drift (4 µV/°C), open-loop gain (≥90 dB), and quiescent current (≤75 µA) guaranteed across this range. Its CMOS process and thermal design ensure stable rail-to-rail operation and low input bias current even at 125°C-critical for engine bay sensors or factory-floor controllers. The OPA348AIDBVT's performance consistency is validated in Figures 7–9 of SBOS213H, confirming suitability for AEC-Q100–adjacent industrial deployments.

Can the OPA348AIDBVT be used as a replacement for the OPA348IDBVR?

No-OPA348AIDBVT and OPA348IDBVR are distinct orderable variants: OPA348AIDBVT is the automotive-grade version (A-grade) with extended temperature qualification (−40°C to +125°C) and tighter parametric limits (e.g., lower max input offset), while OPA348IDBVR is the commercial-grade (I-grade) part rated only to +85°C. Both share the same SC70-5 package and pinout, but OPA348AIDBVT is required for automotive or harsh-environment applications. Substitution requires validation of full spec compliance per SBOS213H Rev H.