Texas Instruments OPA348AIDCKRG4

Overview

OPA348AIDCKRG4 from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for ultra-low-power, single-supply 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 high-impedance sensor front-ends.

For engineers reviewing the OPA348AIDCKRG4 datasheet, OPA348AIDCKRG4 pinout, OPA348AIDCKRG4 application, or OPA348AIDCKRG4 equivalent, key selection criteria include its extended common-mode range (–0.2 V to V₊ + 0.2 V), 18 mV output swing from rail (at 100 kΩ), and SC70-5 package compatibility with space-constrained portable designs.

Technical Context

The OPA348AIDCKRG4 employs a complementary N/P-channel input stage enabling rail-to-rail input operation across –0.2 V to V₊ + 0.2 V, with no phase inversion even when inputs exceed supply rails (if current-limited to ≤10 mA). Its class-AB output stage supports rail-to-rail output swing down to 18 mV from V₊ or V_– under light loads.

It is unity-gain stable and drives up to 250 pF capacitive load directly; stability with larger loads is enhanced via series output resistance (10–20 Ω) or feedback capacitance (4–6 pF). All electrical specifications are guaranteed from –40°C to +125°C at supply voltages from 2.1 V to 5.5 V.

Key Specifications

Pinout & Package

The OPA348AIDCKRG4 is housed in a 5-pin SC70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for ultra-compact PCB layouts in portable and wearable devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA348AIDCKRG4, the OPA348AIDBVR offers identical electrical performance in a slightly larger, thermally less efficient package, while the MCP6001T-E/OT trades bandwidth, input bias, and temperature range for lower quiescent current - making it viable only in non-critical commercial environments.

Availability

OPA348AIDCKRG4 is available at Aetrix Electronics and suitable for smoke detection systems, portable gas analyzers, and wearable biometric monitors requiring stable component supply across long production lifecycles.

Supply support for OPA348AIDCKRG4 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, data converters, and power management ICs.

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

FAQ

What is the maximum capacitive load the OPA348AIDCKRG4 can drive in unity-gain configuration?

The OPA348AIDCKRG4 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 - a technique validated in TI's SBOS213H datasheet Figure 22. This capability makes OPA348AIDCKRG4 suitable for driving ADC input capacitance and PCB trace capacitance in compact sensor nodes.

Does the OPA348AIDCKRG4 support true rail-to-rail input when powered from a 3.3 V supply?

Yes, the OPA348AIDCKRG4 supports rail-to-rail input from (V–) – 0.2 V to (V+) + 0.2 V across its full supply range (2.1 V to 5.5 V). At 3.3 V supply, this means input signals from –0.2 V to +3.5 V are fully linear - critical for interfacing with sensors whose output may exceed the supply due to offset or transient conditions. The complementary N/P-channel input stage ensures no phase reversal, provided input current remains ≤10 mA.

What is the typical input offset voltage drift of the OPA348AIDCKRG4 over temperature?

The OPA348AIDCKRG4 has a typical input offset voltage drift of 4 µV/°C over the full operating temperature range of –40°C to +125°C. This low drift, combined with a maximum 6 mV offset over temperature, ensures stable DC accuracy in precision sensor amplification - especially important in battery-operated CO detectors and medical thermistor interfaces where calibration must remain valid across seasonal ambient shifts.

Can the OPA348AIDCKRG4 be used to drive the ADS7822 12-bit ADC?

Yes, the OPA348AIDCKRG4 is explicitly referenced in TI documentation as an optimal driver for the ADS7822 12-bit ADC. Its 1 MHz bandwidth, rail-to-rail output swing (within 18 mV of rails), and low 0.5 pA input bias current minimize settling error and charge injection effects during ADC sample-and-hold acquisition - enabling full 12-bit accuracy without external compensation networks.

Is the OPA348AIDCKRG4 pin-compatible with other variants in the OPAx348 family?

No, the OPA348AIDCKRG4 (SC70-5) is not pin-compatible with OPA2348 or OPA4348, nor with OPA348 variants in SOIC-8 or SOT-23-5 packages. Its 5-pin SC70 layout (OUT, V–, +IN, –IN, V+) differs from the 8-pin SOIC pinout and lacks NC pins present in larger packages. Migration requires PCB redesign; however, electrical behavior and functional specifications are identical across all OPA348 variants.