Texas Instruments OPA355NA/250G4

Overview

OPA355NA/250G4 from Texas Instruments is a single-channel, high-speed CMOS operational amplifier optimized for video and wideband signal conditioning. It delivers 450 MHz unity-gain bandwidth, 200 MHz gain-bandwidth product, rail-to-rail output swing within 100 mV of rails, 5.8 nV/√Hz input voltage noise, and digital shutdown with 100 ns enable time - deployed in composite video buffers, photodiode transimpedance stages, and ADC input drivers.

For engineers reviewing the OPA355NA/250G4 datasheet, OPA355NA/250G4 pinout, OPA355NA/250G4 application, or OPA355NA/250G4 equivalent, key selection criteria include its 75 MHz 0.1-dB gain flatness, 0.02% differential gain error, ±60 mA continuous output current, shutdown current of 3.4 µA per channel, and operation from 2.5 V to 5.5 V single supply.

Technical Context

The OPA355NA/250G4 implements a voltage-feedback CMOS architecture with unity-gain stability and Class AB output stage. Its input common-mode range extends 100 mV below ground and up to 1.5 V below V+, enabling true single-supply operation down to 2.5 V. The enable pin controls a low-leakage CMOS gate with internal 100-kΩ pullup to V+.

Thermal shutdown activates at 160°C junction temperature and resets at 140°C. Output impedance remains below 0.02 Ω below 100 kHz, supporting stable driving of 150 Ω video loads. Differential phase error is specified at 0.05° under NTSC conditions with RL = 150 Ω.

Key Specifications

Pinout & Package

OPA355NA/250G4 is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, 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 operational amplifier applications.

Compared with OPA355NA/250G4, OPA356IDBVR trades shutdown functionality for lower quiescent current and identical pinout, while LMH6629MA/NOPB offers higher bandwidth at the cost of video performance certification and integrated power control.

Availability

OPA355NA/250G4 is available at Aetrix Electronics and suitable for video processing, photodiode transimpedance amplification, and ADC input buffering requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for OPA355NA/250G4 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 specializing in analog and embedded processing technologies, with leadership in high-performance op amps and precision signal chain solutions.

The OPA355 family was designed for video, ultrasound, and optical networking applications demanding wide bandwidth, low distortion, and rail-to-rail operation on low-voltage single supplies.

FAQ

What is the maximum operating supply voltage for the OPA355NA/250G4?

The OPA355NA/250G4 has an absolute maximum supply voltage of 7.5 V across V+ and V−. Its recommended operating range is 2.5 V to 5.5 V. Exceeding 7.5 V risks permanent damage. At 5.5 V, it delivers full-rated performance including 450 MHz unity-gain bandwidth and 0.02% differential gain error. Always observe derating guidelines for thermal management above 125°C ambient.

Does the OPA355NA/250G4 support true single-supply operation with input signals at ground?

Yes, the OPA355NA/250G4 supports true single-supply operation: its input common-mode range extends 100 mV below ground and up to 1.5 V below V+, allowing direct connection of grounded sensors or AC-coupled sources without level shifting. This feature is confirmed in the datasheet's Recommended Operating Conditions and Typical Characteristics (Figure 20). The OPA355NA/250G4 maintains specified offset voltage and CMRR across this range.

How does the ENABLE pin function on the OPA355NA/250G4?

The ENABLE pin on the OPA355NA/250G4 is TTL-compatible and internally pulled up to V+ via 100 kΩ. A logic-high voltage ≥2 V enables normal operation (IQ = 8.3 mA); a logic-low ≤0.8 V disables the amplifier, reducing current to 3.4 µA and placing the output in high-impedance state. Enable and disable times are 100 ns and 30 ns respectively - verified in Figure 5 of the OPA355NA/250G4 datasheet.

What is the output drive capability of the OPA355NA/250G4 into 150 Ω loads?

The OPA355NA/250G4 delivers ±60 mA continuous output current and ±100 mA peak current into 150 Ω loads at 5 V supply. Its output voltage swing remains within 0.3 V of each rail under these conditions (per Electrical Characteristics Table, VO swing column). Thermal shutdown engages at 160°C junction temperature if sustained overload occurs - validated in Figure 21 and Figure 22 of the OPA355NA/250G4 datasheet.

Is the OPA355NA/250G4 suitable for driving ADC inputs in high-speed data acquisition?

Yes, the OPA355NA/250G4 is explicitly qualified for ADC input buffering: it achieves 30 ns settling to 0.1% and 120 ns to 0.01% for a 2-V step, with 0.02 Ω closed-loop output impedance below 100 kHz. Its 200 MHz GBW and 450 MHz unity-gain bandwidth support accurate sampling of multi-MSPS waveforms. The datasheet lists "Analog-to-Digital Converter (ADC) Input Buffers" as a primary application.