Texas Instruments OPA453TA

Overview

OPA453TA from Texas Instruments is a high-voltage, high-current operational amplifier optimized for closed-loop gains ≥5, delivering 7.5MHz gain-bandwidth product, ±50mA continuous output drive, and ±40V supply capability in a TO-220-7 package with electrically connected tab to V–. It serves as a robust output stage in piezoelectric drivers, servo amplifiers, and high-voltage test equipment where rail-to-rail swing and thermal protection are critical.

For engineers reviewing the OPA453TA datasheet, OPA453TA pinout, OPA453TA application, or OPA453TA equivalent, this page provides verified technical context, validated pin functions, confirmed thermal shutdown flag behavior, exact SOA limits at ±40V, and two rigorously cross-checked alternative parts for high-gain, high-output-voltage amplifier designs.

Technical Context

The OPA453TA uses a compensated internal architecture requiring minimum noise gain of 5 for stability-unlike the unity-gain-stable OPA452TA. Its 7.5MHz GBW and +23/–38V/µs slew rate enable fast settling (1µs to 0.1%) in G = +5 configurations with 10V step and 100pF load.

Thermal shutdown activates at +160°C junction temperature and resets at +145°C, signaled via the Flag pin's current shift from <1µA (normal) to 100–165µA (shutdown). The TO-220-7 tab is electrically tied to V– and must be thermally anchored but not used for current conduction.

Key Specifications

Pinout & Package

OPA453TA is housed in a 7-lead TO-220 (KC) package with electrically connected metal tab tied to V–. The tab must be soldered to a large copper area for thermal management but must not carry current.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage, high-current amplifier applications.

Compared with OPA453FA and OPA547T, the OPA453TA offers superior small-signal speed and proven thermal interface for benchtop or chassis-mount use, while trading off SMT compatibility and programmable features - making it ideal for fixed-gain, high-fidelity HV analog output stages.

Availability

OPA453TA is available at Aetrix Electronics and suitable for piezoelectric actuator drivers, servo motor amplifiers, and high-voltage test equipment requiring stable component supply, long-lifecycle assurance, and RoHS-compliant TO-220 packaging.

Supply support for OPA453TA 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 amplifiers and high-reliability power solutions.

The OPA453TA belongs to TI's OPAx45x high-voltage op amp family, designed specifically for industrial and test equipment applications demanding wide supply range, robust protection, and guaranteed performance across –40°C to +125°C.

FAQ

What is the minimum stable gain for OPA453TA, and why does it matter?

The OPA453TA is internally compensated for minimum noise gain of 5 - meaning it is unstable at unity or low gains (e.g., G = 1 or G = 2) without external compensation. This design enables its 7.5MHz GBW and +23V/µs slew rate. Using OPA453TA below G = 5 risks oscillation unless compensated per Figure 9 in SBOS127C; for unity-gain applications, the OPA452TA is the appropriate choice.

How is the Flag pin on OPA453TA used in system monitoring?

The Flag pin on OPA453TA outputs <1µA during normal operation and 100–165µA when thermal shutdown activates at +160°C junction temperature. This current shift allows direct interfacing with CMOS or HCT logic using a simple pull-up resistor - for example, a 39kΩ resistor to +5V yields ~1.95V (logic high) during shutdown. This enables real-time thermal fault detection without additional ICs.

Can OPA453TA operate from asymmetric power supplies, and what are the limits?

Yes - OPA453TA supports total supply voltage up to 80V with asymmetry allowed: e.g., +70V and –10V (80V total) or +20V and –10V (30V total). The device maintains full specifications across ±10V to ±40V, but output swing is referenced to each rail independently: VO can swing to (V–)+4V and (V+)–4V at ±50mA. Asymmetry increases power dissipation in the output stage, so thermal design must account for worst-case (V+ – VO) or (VO – V–) voltage drop.

What is the safe operating area (SOA) limitation for OPA453TA at ±40V supply?

At ±40V supply, OPA453TA's SOA restricts simultaneous voltage and current: for example, at |VS| – |VO| = 20V, maximum continuous IO is ~40mA; at |VS| – |VO| = 60V, IO drops to ~10mA. Short-circuit to ground at ±40V forces 125mA and ~10W dissipation - exceeding practical heatsinking. Always consult Figure 3 in SBOS127C and verify junction temperature stays ≤+125°C using θJA estimates and ambient conditions.

Is the TO-220 tab on OPA453TA electrically isolated, and how should it be mounted?

No - the metal tab on OPA453TA is electrically connected to Pin 2 (V–) per datasheet note. It must never carry current but must be soldered to a large copper pour for thermal conduction. Use thermal vias under the tab and avoid routing signal traces beneath it. Do not insulate the tab with mica or sil-pad unless isolation is absolutely required - and if so, derate power handling significantly due to increased θJC.