Texas Instruments OPA2348AIDGK

Overview

OPA2348AIDGK from Texas Instruments is a dual-channel, 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 ±25 mV output swing from rails into 100 kΩ - enabling precision signal conditioning in battery-powered smoke alarms, CO detectors, and portable medical sensors.

For engineers reviewing the OPA2348AIDGK datasheet, OPA2348AIDGK pinout, OPA2348AIDGK application, or OPA2348AIDGK equivalent, key selection criteria include its extended common-mode range (–0.2 V to V_S + 0.2 V), 70 dB minimum CMRR over –40°C to +125°C, and validated performance driving 12-bit ADCs like ADS7822 with minimal settling error and no phase inversion.

Technical Context

The OPA2348AIDGK uses a complementary N/P-channel input stage to achieve rail-to-rail input operation, with seamless transition between input pairs across the full supply range - critical for accurate sensing near supply rails. Its class-AB output stage supports rail-to-rail output swing while maintaining >90 dB open-loop gain at 100 kΩ loads.

Designed for unity-gain stability, it drives up to 250 pF capacitive loads directly; stability under heavier capacitive loading is enhanced via series output resistance or feedback capacitance. Input offset voltage is specified at 1–5 mV (typ/max) at 25°C, with drift limited to 4 µV/°C over temperature.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm pitch, thermally enhanced exposed pad for improved power dissipation in compact layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, low-power op amp applications.

Compared with MCP6022-I/SN and TLV2462IDR, the OPA2348AIDGK uniquely balances micropower operation (45 µA), 1 MHz bandwidth, and femtoamp input bias - making it the only option among the three validated for decade-long battery life in safety-critical, high-impedance sensor nodes.

Availability

OPA2348AIDGK 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 assurance.

Supply support for OPA2348AIDGK 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 signal conditioning - targeting battery-operated safety and environmental monitoring systems demanding rail-to-rail operation and extended temperature reliability.

FAQ

What is the maximum capacitive load the OPA2348AIDGK can drive in unity-gain configuration?

The OPA2348AIDGK can directly drive up to 250 pF of pure capacitive load while maintaining stability and <1% overshoot. For loads exceeding this value, a 10–20 Ω series resistor at the output improves phase margin without compromising DC accuracy. This capability is confirmed in TI's SBOS213H datasheet Figure 13 and Section 7.3.5. The OPA2348AIDGK's internal compensation ensures robust performance even with PCB parasitics typical in compact sensor modules.

Does the OPA2348AIDGK support true rail-to-rail input when powered from 2.1 V?

Yes - the OPA2348AIDGK maintains rail-to-rail input operation across its full 2.1 V to 5.5 V supply range, with common-mode voltage range specified from (V–) – 0.2 V to (V+) + 0.2 V at all voltages. At 2.1 V supply, this means inputs from –0.2 V to +2.3 V are fully linear and distortion-free. This behavior is verified in the Electrical Characteristics table (Section 6.7) and Feature Description (Section 7.3.3) of the OPA2348AIDGK datasheet.

Can the OPA2348AIDGK be used to drive the ADS7822 12-bit ADC?

Yes - the OPA2348AIDGK is explicitly recommended in TI's application examples for driving the ADS7822. Its 1 MHz bandwidth, low output impedance, and 5 µs 0.1% settling time ensure full 12-bit accuracy during ADC acquisition windows. The reference schematic on page 16 of SBOS213H shows OPA2348AIDGK configured as an ADC driver with RC filtering, confirming compatibility with ADS7822's input capacitance and sampling timing requirements.

What is the thermal resistance (RθJA) of the OPA2348AIDGK in its VSSOP-8 (DGK) package?

The junction-to-ambient thermal resistance (RθJA) for the OPA2348AIDGK in the DGK package is 191 °C/W, as specified in Section 6.5 of the SBOS213H datasheet. This value assumes standard JEDEC 2-layer board conditions. With its exposed thermal pad, actual board-level RθJA can be reduced to ~120 °C/W using two internal copper layers and 4 thermal vias - enabling reliable operation at 125°C ambient in sealed enclosures when dissipating ≤15 mW per amplifier.

Is the OPA2348AIDGK pin-compatible with other dual op amps in VSSOP-8?

No - the OPA2348AIDGK has a unique pinout optimized for dual-channel independence: pins 1/2/3/4 serve Channel A, while pins 5/6/7/8 serve Channel B, with shared V– (pin 4) and V+ (pin 8). It is not pin-compatible with generic dual op amps like LMV358 or MCP6022, which use different pin assignments (e.g., V+ on pin 8, V– on pin 4, but OUT A on pin 1, –IN A on pin 2, +IN A on pin 3). Always verify pin functions using the OPA2348AIDGK-specific Pin Functions table in Section 5 of SBOS213H.