Texas Instruments OPA301AID

Overview

OPA301AID from Texas Instruments is a single-channel, low-noise, fast-settling CMOS operational amplifier optimized for 16-bit ADC input driving. It delivers 150MHz unity-gain bandwidth, 3nV/√Hz input voltage noise, and 150ns 16-bit settling time with ±100mV output swing from rails on +2.7V to +5.5V supply - enabling high-fidelity signal conditioning in portable data acquisition systems.

For engineers reviewing the OPA301AID datasheet, OPA301AID pinout, OPA301AID application, or OPA301AID equivalent, key selection criteria include its rail-to-rail output capability under 2kΩ load, shutdown current of 5µA, THD+N of 0.003% at 1kHz, and SOIC-8 package compatibility with industrial temperature range (−40°C to +125°C).

Technical Context

The OPA301AID implements a classic two-stage CMOS topology with folded cascode input stage and Class AB output stage, enabling both high slew rate (80V/µs) and unity-gain stability. Its input bias current is ±0.1pA (typ), common-mode input range extends from (V−) − 0.2V to (V+) − 0.9V, and PSRR exceeds 50μV/V across 2.7–5.5V supply variation.

Unlike the OPA300, the OPA301AID lacks an enable/shutdown pin - confirmed by pin configuration diagrams (Figure 4-4: SO-8 package with NC pins at 1 and 5, no Enable terminal). It operates exclusively in active mode with quiescent current of 9.5mA (typ) at 25°C and maintains >95dB open-loop gain up to 125°C.

Key Specifications

Pinout & Package

OPA301AID is housed in an 8-pin SOIC (D) package per TI's orderable information and Figure 4-4. Pin 1 and Pin 5 are No Connect (NC); functional terminals are V+, −In, Out, V−, and +In on Pins 7, 2, 6, 4, and 3 respectively.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar op amp applications.

Compared with OPA300AID, OPA301AID removes the enable function to reduce pin count and simplify PCB layout for always-on ADC drivers; versus ADA4897-1ARZ, it trades 75MHz bandwidth and 2nV/√Hz noise for lower power and extended temperature compliance - making OPA301AID optimal for cost-sensitive, battery-constrained 16-bit DAQ systems.

Availability

OPA301AID is available at Aetrix Electronics and suitable for 16-bit data acquisition, portable instrumentation, and industrial sensor signal conditioning requiring stable component supply across −40°C to +125°C operation.

Supply support for OPA301AID 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 high-performance op amps and precision signal chain solutions.

The OPAx30x product line was designed specifically for 16-bit resolution systems requiring fast settling, low distortion, and single-supply operation - targeting high-speed data converters, medical imaging front-ends, and test equipment signal paths.

FAQ

What is the maximum capacitive load the OPA301AID can drive stably in unity-gain configuration?

The OPA301AID is specified to drive a few picofarads of capacitive load without instability in unity-gain configuration, as shown in Figure 5-16. Board-level parasitic capacitance exceeding 1–2pF requires series output resistance (e.g., 20–75Ω) to maintain phase margin. For loads >100pF, consider using a small series resistor and verify stability with network analysis.

Does the OPA301AID have a shutdown or enable pin?

No, the OPA301AID does not include a shutdown or enable pin. Unlike the OPA300AID, its SOIC-8 pinout (Figure 4-4) shows Pins 1 and 5 as No Connect (NC), and the device operates continuously when powered. The OPA301AID is intended for always-on applications where low-power sleep modes are unnecessary.

What is the input common-mode voltage range for the OPA301AID at 5V supply?

At VS = 5V, the OPA301AID input common-mode voltage range is from (V−) − 0.2V to (V+) − 0.9V, i.e., −0.2V to +4.1V referenced to ground. This allows operation with inputs extending 200mV below ground and up to 900mV below the positive rail - supporting true single-supply operation with bipolar input signals.

Can the OPA301AID be used with a 2.7V supply while maintaining full 150MHz bandwidth?

Yes, the OPA301AID maintains its 150MHz unity-gain bandwidth down to +2.7V supply, as confirmed in Section 5.4 and Figure 5-1. However, output swing reduces to ~1.8VPP (Figure 5-21) and quiescent current drops slightly (~8.5mA), preserving high-speed performance in ultra-low-voltage portable systems.

How does the OPA301AID's THD+N performance compare at 1MHz versus 1kHz?

At 1kHz and 3VPP output, OPA301AID achieves 0.003% THD+N. At 1MHz and 2VPP, THD remains <−70dBc (≈0.03%) per Figure 5-11 - a tenfold increase due to bandwidth-limited harmonic generation. This confirms suitability for IF amplification up to ~10MHz where distortion stays below 0.1%.