Texas Instruments OPA365AIDBVRG4

Overview

OPA365AIDBVRG4 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 OPA365AIDBVRG4 datasheet, OPA365AIDBVRG4 pinout, OPA365AIDBVRG4 application, or OPA365AIDBVRG4 equivalent, this device is selected for demanding analog front-ends where zero-crossover distortion, 100-mV beyond-rail input capability, and 4.5-nV/√Hz noise at 100 kHz are critical to maintaining signal fidelity across −40°C to +125°C.

Technical Context

The OPA365AIDBVRG4 employs a proprietary zerø-crossover input stage that eliminates transition-region distortion common in complementary-input rail-to-rail op amps, ensuring linear CMRR ≥100 dB over full input range. Its regulated charge-pump internal biasing enables stable operation down to 2.2 V while maintaining rail-to-rail output swing within 10 mV of both rails under 10-kΩ load.

This architecture supports fast settling (300 ns to 0.01%) and wideband closed-loop stability - including unity-gain operation with up to 1 nF capacitive load - making it suitable for active filtering, sensor amplification, and high-fidelity audio buffering without external compensation.

Key Specifications

Pinout & Package

OPA365AIDBVRG4 is packaged in a 5-pin SOT-23 (DBV) surface-mount package measuring 2.9 mm × 1.6 mm × 1.15 mm, optimized for space-constrained PCB layouts in portable instrumentation and embedded sensors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV365IDBVR and OPA837IDBVR, OPA365AIDBVRG4 uniquely balances ultra-low distortion (0.0004% THD+N), rail-to-rail I/O, and femtoampere input bias - making it the optimal choice for precision, wideband, single-supply signal chains where all three attributes are simultaneously required.

Availability

OPA365AIDBVRG4 is available at Aetrix Electronics and suitable for data acquisition, test equipment, and audio line driver applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA365AIDBVRG4 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 company designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and communications markets.

The OPAx365 product line was developed specifically for high-fidelity, single-supply analog signal conditioning - targeting ADC driver, active filtering, and sensor interface applications where zero-crossover distortion and rail-to-rail operation are essential.

FAQ

What is the maximum capacitive load the OPA365AIDBVRG4 can drive stably in unity-gain configuration?

The OPA365AIDBVRG4 remains stable with pure capacitive loads up to 1 nF in unity-gain buffer configuration, as verified by overshoot testing in TI's SBOS365G datasheet Figure 7-15. For loads exceeding 1 nF, adding a 10–20 Ω series resistor at the output suppresses ringing while introducing ≤0.2% gain error with 10-kΩ parallel load - a trade-off validated in Section 8.3.3 of the official documentation.

Does the OPA365AIDBVRG4 support true rail-to-rail input beyond the supply rails?

Yes - the OPA365AIDBVRG4 features a true rail-to-rail input stage that operates with common-mode voltage ranging from (V−) − 0.1 V to (V+) + 0.1 V, confirmed in Section 7.6 Electrical Characteristics (V_CM parameter) and Figure 8-1 of the SBOS365G datasheet. This 100-mV beyond-rail capability enables direct connection to overvoltage-tolerant sensors or DACs without external clamping.

What is the guaranteed minimum common-mode rejection ratio (CMRR) for OPA365AIDBVRG4 over temperature?

The OPA365AIDBVRG4 guarantees a minimum CMRR of 100 dB over the full operating temperature range of −40°C to +125°C, as specified in Section 7.6 Electrical Characteristics (CMRR row, "MIN" column). This performance is maintained across supply voltages from 2.2 V to 5.5 V and is critical for rejecting power-supply noise in industrial sensor interfaces.

Can the OPA365AIDBVRG4 operate from a 2.5-V single supply?

Yes - the OPA365AIDBVRG4 is fully specified for operation from 2.2 V to 5.5 V, including 2.5-V single-supply use. Section 7.3 Recommended Operating Conditions confirms functionality at 2.5 V, and Figure 7-10 shows quiescent current remains stable (≈4.6 mA) across this range, enabling reliable performance in battery-powered instrumentation.

How does the zerø-crossover topology in OPA365AIDBVRG4 improve THD+N versus conventional rail-to-rail op amps?

The zerø-crossover topology eliminates the input-stage transition region where complementary P/N MOS pairs switch conduction - a primary source of crossover distortion in standard rail-to-rail amplifiers. As documented in Section 8.3.1 and Figure 8-1, this results in continuous, linear input offset behavior across the entire common-mode range, directly enabling the 0.0004% THD+N specification at 1 kHz without post-processing correction.