Texas Instruments OPA300AIDR

Overview

OPA300AIDR from Texas Instruments is a single-channel, high-speed, low-noise CMOS operational amplifier designed for 16-bit precision signal conditioning. It delivers 150MHz unity-gain bandwidth, 3nV/√Hz input voltage noise, and 150ns 16-bit settling time. Operates from +2.7V to +5.5V single supply and features digital shutdown (5µA quiescent current), making it ideal for ADC input drivers in portable data acquisition systems.

For engineers reviewing the OPA300AIDR datasheet, OPA300AIDR pinout, OPA300AIDR application, or OPA300AIDR equivalent, key selection criteria include its 150MHz bandwidth with unity-gain stability, rail-to-rail output swing (within 100mV of rails), shutdown enable timing (t_ON = 5µs, t_OFF = 40ns), and SOIC-8 package compatibility with industrial temperature range (−40°C to +125°C).

Technical Context

The OPA300AIDR uses a classic two-stage CMOS topology with folded cascode input stage and Class AB output stage, enabling high slew rate (80V/µs) while maintaining stability. Its differential input pair is biased for optimal speed-noise trade-off, and internal ESD protection diodes clamp inputs to supply rails with ±10mA current limit.

It implements a CMOS enable input referenced to V−, requiring logic high ≥ (V− + 2.5V) to activate and logic low ≤ (V− + 0.8V) to shut down. When disabled, the output enters high-impedance state-enabling multiplexed analog bus architectures without external isolation switches.

Key Specifications

Pinout & Package

OPA300AIDR is housed in an 8-pin SOIC (D) package with standard industry footprint (5.3mm × 6.2mm, 1.27mm pitch). Pin 1 is marked with a beveled corner or dot; device is rated for −40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, low-noise op amp applications.

Compared with OPA301AIDR, OPA300AIDR adds enable control at identical noise and speed-critical for power-gated systems. Versus LMH6629MA/NOPB, OPA300AIDR trades bandwidth for lower power, wider temperature range, and integrated shutdown-making it superior for portable 16-bit data acquisition.

Availability

OPA300AIDR is available at Aetrix Electronics and suitable for 16-bit ADC driver, low-noise preamplifier, and IF/RF amplifier applications requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for OPA300AIDR 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 chains.

The OPAx30x product line was engineered specifically for 16-bit resolution systems demanding fast settling, low distortion, and single-supply operation-targeting data acquisition, instrumentation, and communications infrastructure.

FAQ

What is the maximum capacitive load the OPA300AIDR can drive stably in unity-gain configuration?

The OPA300AIDR is stable driving up to ~5pF of capacitive load in unity-gain configuration without external compensation, as confirmed by Figure 5-16 in the datasheet. For larger loads (e.g., >10pF), a series resistor (RS) between output and load is required-TI recommends RS = 40Ω for CL = 10pF or RS = 55Ω for CL = 5pF to maintain phase margin. Board parasitics must be minimized to avoid unintentional instability.

Does the OPA300AIDR require external compensation for G = +2 non-inverting operation?

No, the OPA300AIDR is unity-gain stable and does not require external compensation for any closed-loop gain ≥1, including G = +2 non-inverting operation. Its internal compensation ensures ≥45° phase margin across all gains ≥1 and frequencies up to 150MHz, as validated in Figures 5-1 and 5-6 of the SBOS271F datasheet.

What is the valid logic voltage range for the Enable pin of the OPA300AIDR?

The Enable pin of the OPA300AIDR is referenced to V−. A valid logic high is (V−) + 2.5V to (V+) + 0.2V; a valid logic low is (V−) − 0.2V to (V−) + 0.8V. For example, with V− = 0V and V+ = 5V, enable activates at ≥2.5V and disables at ≤0.8V. Floating the pin defaults to enabled via internal pull-up.

Can the OPA300AIDR operate from a +3.3V single supply while maintaining full 16-bit settling performance?

Yes, the OPA300AIDR is fully specified from +2.7V to +5.5V. At +3.3V, it maintains 150ns 16-bit settling time, 3nV/√Hz noise, and rail-to-rail output swing (within 100mV of rails into 2kΩ), as confirmed in Section 5.4 Electrical Characteristics and Figure 5-24 (max output vs frequency at VS = 2.7V/5V).

How does the OPA300AIDR's input bias current affect high-impedance sensor interfaces?

The OPA300AIDR exhibits ultra-low input bias current (±0.1pA typical, ±5pA max), minimizing voltage error across high-impedance sources (e.g., >100MΩ pH electrodes or piezoelectric sensors). This ensures <0.5mV offset error even with 10GΩ source impedances-critical for precision DC-coupled preamplifiers where leakage would otherwise dominate error budgets.