Texas Instruments OPA365AIDRG4

Overview

OPA365AIDRG4 from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for high-speed, low-distortion signal conditioning in single-supply systems. It delivers 50 MHz gain bandwidth, 25 V/µs slew rate, and 0.0004% THD+N at 1 kHz - enabling precision driving of SAR and sigma-delta ADCs in data acquisition and test equipment.

For engineers reviewing the OPA365AIDRG4 datasheet, OPA365AIDRG4 pinout, OPA365AIDRG4 application, or OPA365AIDRG4 equivalent, this device is selected for demanding analog front-ends requiring wideband linearity, sub-100 µV offset, and operation down to 2.2 V with rail-to-rail swing within 10 mV of supply rails.

Technical Context

The OPA365AIDRG4 employs a proprietary zerø-crossover distortion topology that eliminates input stage crossover nonlinearity across the full common-mode range (–0.1 V to V_S + 0.1 V), ensuring consistent 100 dB CMRR and <0.0004% THD+N. Its regulated charge-pump internal biasing enables stable rail-to-rail output swing even at 2.2 V supply.

This architecture supports fast settling (300 ns to 0.01%) and high open-loop gain (100 dB min) while maintaining low input bias current (±0.2 pA typ) and 4.5 nV/√Hz voltage noise at 100 kHz - critical for sensor amplification and audio preamplifier stages where DC accuracy and AC fidelity must coexist.

Key Specifications

Pinout & Package

OPA365AIDRG4 is packaged in an 8-pin SOIC (D package), with pins 1, 5, and 8 designated as no-connect (NC). The active terminals support standard op-amp configuration with dual supply capability and single-supply biasing flexibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA365AIDRG4, OPA365AIDBVR offers identical performance in a smaller package but sacrifices NC pins for routing flexibility, while TLV365IDR trades marginally higher slew rate for superior offset drift control - making each optimal for distinct design priorities: board area, thermal robustness, or long-term DC accuracy.

Availability

OPA365AIDRG4 is available at Aetrix Electronics and suitable for data acquisition systems, test equipment, and audio signal processing requiring stable component supply across extended temperature ranges and high-volume production cycles.

Supply support for OPA365AIDRG4 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 op-amps and signal-chain solutions.

The OPA365AIDRG4 belongs to TI's high-speed, zero-crossover op-amp product line designed specifically for single-supply, high-fidelity analog front-ends in data converters, instrumentation, and portable audio systems.

FAQ

What is the maximum capacitive load the OPA365AIDRG4 can drive stably in unity-gain configuration?

The OPA365AIDRG4 remains stable with pure capacitive loads up to approximately 1 nF in unity-gain (G = +1) configuration, as confirmed by overshoot testing in the official datasheet. For larger loads, adding a 10–20 Ω series resistor at the output reduces ringing but introduces gain error - e.g., 0.2% error with R_L = 10 kΩ and R_S = 20 Ω. The OPA365AIDRG4 datasheet Figure 7-15 provides detailed overshoot vs. capacitive load curves.

Does the OPA365AIDRG4 support true rail-to-rail input operation below 2.2 V supply?

No - the OPA365AIDRG4 is specified for operation only from 2.2 V to 5.5 V. Below 2.2 V, parameters including gain bandwidth, slew rate, and input common-mode range are not guaranteed. The datasheet Section 7.3 explicitly defines 2.2 V as the minimum recommended supply voltage, and the zerø-crossover topology requires sufficient headroom for internal charge-pump operation. Operating the OPA365AIDRG4 below this threshold risks degraded CMRR and increased THD+N.

Can the OPA365AIDRG4 achieve 0 V output in single-supply applications?

Yes - the OPA365AIDRG4 can reach 0 V output using an external pulldown resistor (e.g., 10 kΩ) connected from V_OUT to a negative supply (e.g., –5 V), drawing ~500 µA. This technique is validated in the OPA365AIDRG4 datasheet Section 8.3.4 and Figure 8-4. However, doing so alters output-stage biasing, reducing open-loop gain and bandwidth; it is not supported without the external negative rail.

What is the input common-mode voltage range specification for the OPA365AIDRG4?

The OPA365AIDRG4 features a true rail-to-rail input stage with a common-mode voltage range extending from (V₋ – 0.1 V) to (V₊ + 0.1 V), as specified in Section 7.6 of the datasheet. This allows direct interface to signals beyond the supply rails - for example, a 0–5 V input on a 3.3 V system - provided input current is limited to ±10 mA per Section 7.1. This range is maintained across the full operating temperature range of –40°C to +125°C.

How does the OPA365AIDRG4's THD+N performance compare at different supply voltages?

The OPA365AIDRG4 maintains 0.0004% THD+N at 1 kHz, 4 V_PP, R_L = 600 Ω across its full 2.2–5.5 V supply range, as tested and guaranteed in the Electrical Characteristics table (Section 7.6). This consistency stems from its zerø-crossover topology and regulated internal biasing - unlike conventional rail-to-rail op-amps whose distortion increases near supply limits. The OPA365AIDRG4 datasheet Figure 7-13 confirms flat THD+N vs. frequency from 2.2 V to 5.5 V.