Texas Instruments OPA353UA

Overview

OPA353UA from Texas Instruments (formerly Burr-Brown) is a single, rail-to-rail input/output CMOS operational amplifier optimized for low-voltage, single-supply operation (2.7V–5.5V). It delivers 44MHz gain-bandwidth, 22V/µs slew rate, 5nV/√Hz input voltage noise, and output swing within 10mV of rails under 10kΩ load - making it ideal for driving sampling ADCs in portable instrumentation and video line drivers.

For engineers reviewing the OPA353UA datasheet, OPA353UA pinout, OPA353UA application, or OPA353UA equivalent, key selection criteria include its rail-to-rail input common-mode range extending 300mV beyond supply rails, unity-gain stability, 75Ω video drive capability, and SO-8 package compatibility with space-constrained analog signal chains.

Technical Context

The OPA353UA employs a complementary N-channel/P-channel input stage enabling true rail-to-rail input operation across –0.1V to (V+) + 0.1V, with a defined transition region near (V+) – 2V. Its class AB common-source output stage achieves rail-to-rail output swing while maintaining >100dB open-loop gain at 10kΩ load.

Designed on a 0.6µm CMOS process, the device features ultra-low input bias current (±0.5pA typ), high PSRR (150µV/V) and CMRR (86dB), and operates over –40°C to +85°C. It is specified for stable performance with capacitive loads up to 100pF in unity-gain configuration.

Key Specifications

Pinout & Package

OPA353UA is housed in an 8-pin SOIC (SO-8) surface-mount package (Package Drawing D), with thermal resistance θ_JA = 150°C/W. Pin numbering follows standard SOIC convention (pin 1 = top-left corner, counterclockwise).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar operational amplifier applications.

Compared with OPA355UA and TLV2462CD, the OPA353UA provides the best combination of speed (44MHz), noise (5nV/√Hz), rail-to-rail operation, and verified 75Ω video drive - making it the preferred choice for precision, high-fidelity single-amplifier signal paths.

Availability

OPA353UA is available at Aetrix Electronics and suitable for ADC driver circuits, video line drivers, cell phone PA control loops, and portable audio signal conditioning requiring stable component supply and guaranteed SO-8 packaging.

Supply support for OPA353UA 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 (TI) acquired Burr-Brown in 2000 and maintains its high-precision analog portfolio, including op amps, data converters, and interface ICs, with global manufacturing and quality certification.

The OPA353UA belongs to TI's MicroAmplifier™ series - designed specifically for miniature, low-voltage, single-supply applications demanding rail-to-rail I/O, low noise, and high speed in space-constrained portable electronics.

FAQ

What is the minimum supply voltage for reliable operation of the OPA353UA?

The OPA353UA is fully specified from 2.7V to 5.5V, but operates down to 2.5V. At 2.5V, parameters such as gain-bandwidth (44MHz) and slew rate (22V/µs) remain functional, though output swing margin and open-loop gain may degrade slightly. For production designs, use ≥2.7V to guarantee all specifications per datasheet.

Does the OPA353UA require external compensation for unity-gain stability?

No, the OPA353UA is internally compensated and unity-gain stable. It does not require external capacitors or resistors to maintain phase margin in G = 1 configurations. This simplifies ADC buffer and voltage follower designs - confirmed by typical performance curves showing stable step response with CL = 100pF.

Can the OPA353UA drive a 75Ω video load with acceptable distortion?

Yes - the OPA353UA is explicitly characterized for 75Ω video line driving. At G = 2 with NTSC signal, it achieves 0.17% differential gain error and 0.17° differential phase error. Its rail-to-rail output and 22V/µs slew rate support full-swing composite video waveforms without clipping or timing distortion.

What is the meaning of the NC pins on the OPA353UA SO-8 package?

The OPA353UA SO-8 package has three no-connect (NC) pins: pins 5, 6, and 8. These pins are electrically isolated from internal circuitry and serve only mechanical or thermal purposes. They must not be connected to any net - leaving them floating is mandatory per TI's package documentation and avoids unintended coupling or ESD paths.

How does the rail-to-rail input stage of the OPA353UA behave near the supply rails?

The OPA353UA uses parallel N-channel and P-channel input pairs. The N-pair dominates near V+, the P-pair near V–, and both operate in a 400mV transition region centered near (V+) – 2V. Input signals crossing this region may exhibit minor gain variation - avoid placing critical signal transitions here by biasing inputs ≥300mV away from (V+) – 2V in precision applications.