Texas Instruments OPA354AIDDA

Overview

OPA354AIDDA from Texas Instruments is a single-channel, rail-to-rail input/output, voltage-feedback CMOS operational amplifier optimized for high-speed video and precision analog signal conditioning. It delivers 250-MHz unity-gain bandwidth, 150 V/µs slew rate, 6.5 nV/√Hz input voltage noise, ±100 mA output current, and operates from 2.5 V to 5.5 V supply. It drives 75-Ω video cables with 0.02% differential gain error and is used in RGB cable drivers and A/D converter input buffers.

For engineers reviewing the OPA354AIDDA datasheet, OPA354AIDDA pinout, OPA354AIDDA application, or OPA354AIDDA equivalent, key selection criteria include its 250-MHz small-signal bandwidth at G = +1, rail-to-rail I/O swing within 100 mV of rails, thermal shutdown protection (160°C trip), 3 pA input bias current, and compatibility with single-supply 2.5–5.5 V systems requiring low-noise, high-output-current amplification.

Technical Context

The OPA354AIDDA employs a complementary CMOS input stage enabling rail-to-rail common-mode input range extending 100 mV beyond both supply rails, with dual N- and P-channel pairs active across overlapping regions. Its class AB output stage supports ±100 mA continuous output current while maintaining >94 dB open-loop gain and 0.1-dB gain flatness to 40 MHz.

This device is unity-gain stable and specified over –40°C to +125°C. It integrates on-chip thermal shutdown (trip at 160°C, reset at 140°C) and features PowerPAD™ thermal enhancement in the HSOP-8 package, achieving R_θJA = 42.5°C/W - critical for sustained high-current operation in compact layouts.

Key Specifications

Pinout & Package

The OPA354AIDDA is housed in an 8-pin HSOP (Heat Sink Overmolded Package) with exposed PowerPAD™ thermal pad (4.89 mm × 3.90 mm body). The PowerPAD must be connected to V− or left floating per TI design guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA354AIDDA, OPA355IDBVR trades input rail-to-rail and thermal protection for lower power, while THS4121D offers differential signaling but mandates higher supply voltages and lacks rail-to-rail functionality - making OPA354AIDDA uniquely suited for single-supply, high-fidelity, thermally robust video and sensor amplification.

Availability

OPA354AIDDA is available at Aetrix Electronics and suitable for video processing, ultrasound imaging, and photodiode transimpedance amplifier designs requiring stable component supply, extended temperature support (–40°C to +125°C), and high-output-current capability.

Supply support for OPA354AIDDA 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with leadership in precision amplifiers, data converters, and power management ICs.

The OPAx354 series was designed specifically for high-speed video, optical networking, and precision analog signal conditioning - emphasizing unity-gain stability, rail-to-rail I/O, low noise, and robust thermal performance in compact packages.

FAQ

What is the maximum continuous output current specification for OPA354AIDDA?

The OPA354AIDDA is rated for ±100 mA continuous output current per channel under recommended operating conditions (VS = 5 V, TA = 25°C). This is confirmed in Section 7.7 of the SBOS233G datasheet. Exceeding this current continuously may trigger thermal shutdown at 160°C. For peak pulsed loads, the device supports up to ±200 mA short-circuit current, but sustained operation above ±100 mA requires parallel configuration or external current boosting.

Does OPA354AIDDA support true rail-to-rail input operation, and what is the exact common-mode range?

Yes, OPA354AIDDA supports true rail-to-rail input: its common-mode input voltage range extends from (V−) −0.1 V to (V+) + 0.1 V, verified in Section 7.7 Electrical Characteristics. This is achieved via a complementary CMOS input stage with overlapping N- and P-channel pairs. The extended range allows direct interfacing with sensors, DAC outputs, and other circuitry operating at or near the supply rails without level-shifting.

What is the purpose of the NC pins (1, 5, 8) on the OPA354AIDDA HSOP-8 package?

Pins 1, 5, and 8 on the OPA354AIDDA are designated NC (No Connection) - they have no internal electrical connection and serve only mechanical or thermal roles. Per TI's Pin Functions table (Section 6), these pins may be left floating or connected to V− for improved mechanical stability and thermal conduction. They must not be used as signal or supply terminals, as doing so violates the device's validated layout and thermal design.

How does the PowerPAD™ thermal pad on OPA354AIDDA affect PCB layout and thermal performance?

The PowerPAD™ on OPA354AIDDA is an exposed copper thermal pad on the underside of the HSOP-8 package. TI specifies it must be connected to V− (not ground unless V− = GND) or left floating - never tied to a different potential. When soldered to a dedicated V− copper pour with thermal vias, it reduces R_θJA from 216.3°C/W (SOT-23) to 42.5°C/W, enabling safe dissipation of >1 W at ambient temperatures. Incorrect connection risks thermal runaway or parametric shift.

Is OPA354AIDDA unity-gain stable, and what evidence confirms this?

Yes, OPA354AIDDA is explicitly unity-gain stable. The datasheet title states "OPAx354 250-MHz, Rail-to-Rail I/O, CMOS Operational Amplifiers" and Section 8.1 Overview confirms: "the amplifier is unity-gain stable and can operate as a 1-V/V voltage follower." Small-signal frequency response plots (Figure 1) show stable phase margin (>45°) at G = +1, and the device requires no external compensation for unity-gain configurations - a core design feature validated across the full –40°C to +125°C range.