Texas Instruments OPA2348AIDGKR

Overview

OPA2348AIDGKR from Texas Instruments is a dual-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply operation. It delivers 1 MHz gain-bandwidth, 45 µA per amplifier quiescent current, and 0.5 pA input bias current, enabling precision signal conditioning in battery-powered smoke alarms and CO detectors.

For engineers reviewing the OPA2348AIDGKR datasheet, OPA2348AIDGKR pinout, OPA2348AIDGKR application, or OPA2348AIDGKR equivalent, key selection criteria include its extended common-mode range (V– – 0.2 V to V+ + 0.2 V), 25 mV output swing from rails at light loads, and guaranteed operation from –40°C to +125°C across 2.1 V to 5.5 V supply.

Technical Context

The OPA2348AIDGKR uses a complementary N/P-channel input stage to achieve rail-to-rail input operation with 200 mV beyond supply rails, while its Class AB output stage enables rail-to-rail output swing within 18 mV of rails under 100 kΩ load. Its unity-gain stability supports direct driving of ADC input capacitance up to 250 pF.

Designed for single-supply sensor interfaces, it maintains 94 dB open-loop gain and 70 dB CMRR over full temperature range, with input offset voltage drift limited to 4 µV/°C - critical for high-impedance transducer amplification where bias current and thermal drift dominate error budgets.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm pitch, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP6022-E/SN and TLV2462IDR, the OPA2348AIDGKR uniquely balances sub-50 µA power, 1 MHz bandwidth, and 0.5 pA bias current - making it the only dual op amp qualified for decade-long battery operation in safety-critical environmental sensors.

Availability

OPA2348AIDGKR is available at Aetrix Electronics and suitable for smoke alarm manufacturing, CO detector production, and portable medical device development requiring stable component supply and long-term lifecycle support.

Supply support for OPA2348AIDGKR 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 over 90 years of innovation in precision amplifiers and signal chain solutions.

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

FAQ

What is the maximum capacitive load the OPA2348AIDGKR can drive in unity-gain configuration?

The OPA2348AIDGKR can directly drive up to 250 pF of pure capacitive load while maintaining stability in unity-gain buffer configuration. For loads exceeding this value, a small series resistor (10–20 Ω) between the output and capacitive node improves phase margin without degrading DC accuracy - a technique validated in TI's SBOS213H datasheet Figure 22. This capability makes OPA2348AIDGKR ideal for driving ADC input capacitance in designs like ADS7822-based systems.

Does the OPA2348AIDGKR support true rail-to-rail input operation below the negative supply rail?

Yes, the OPA2348AIDGKR supports input voltages down to V– – 0.2 V, enabling true rail-to-rail input operation even when the negative supply is grounded. This is achieved via its complementary N/P-channel input stage, which remains linear across the full range. However, inputs beyond V– – 0.5 V or V+ + 0.5 V must be current-limited to ≤10 mA to prevent damage - a requirement explicitly stated in the Absolute Maximum Ratings table of the OPA2348AIDGKR datasheet.

What is the typical input offset voltage drift of the OPA2348AIDGKR over temperature?

The OPA2348AIDGKR exhibits a typical input offset voltage drift of 4 µV/°C across the full operating temperature range of –40°C to +125°C. This low drift value is specified in the Electrical Characteristics table (Section 6.7) and confirmed in Figure 12 of the SBOS213H datasheet, which shows production distribution data. This performance ensures minimal calibration drift in precision sensor interfaces such as CO detector front-ends where ambient temperature varies widely.

Can the OPA2348AIDGKR operate from a 2.1 V single supply?

Yes, the OPA2348AIDGKR is fully specified and tested for operation from 2.1 V to 5.5 V single supply - a key differentiator versus many competing op amps. The Recommended Operating Conditions table (Section 6.3) explicitly lists 2.1 V as the minimum supply voltage, and all electrical characteristics (including 1 MHz GBW and rail-to-rail I/O) are guaranteed across this range. This enables compatibility with single-cell Li-ion (2.7–4.2 V) and alkaline (up to 1.5 V × 2) battery systems.

How does the OPA2348AIDGKR handle input signals that exceed the supply rails?

The OPA2348AIDGKR does not exhibit phase inversion when inputs exceed the supply rails by up to 0.5 V - a behavior confirmed in Figure 20 of the SBOS213H datasheet. However, absolute maximum ratings limit input voltage to (V–) – 0.5 V and (V+) + 0.5 V. Exceeding these values risks damage unless input current is strictly limited to ≤10 mA using series resistors, as illustrated in Figure 21. This robustness simplifies protection circuitry in noisy industrial sensor environments.