Texas Instruments OPA453TA-1G3

Overview

OPA453TA-1G3 from Texas Instruments is a high-voltage, high-current operational amplifier optimized for closed-loop gains ≥5, delivering 7.5MHz gain-bandwidth, ±50mA continuous output drive, and rail-to-rail-capable output swing (within 4V of rails at 50mA) in a TO-220-7 package with electrically connected tab to V–. It serves as a precision power driver in piezoelectric actuation, servo control, and high-voltage test equipment.

For engineers reviewing the OPA453TA-1G3 datasheet, OPA453TA-1G3 pinout, OPA453TA-1G3 application, or OPA453TA-1G3 equivalent, key selection criteria include minimum stable gain (≥5), thermal shutdown flag functionality, ±10V to ±40V supply flexibility, output current capability under temperature variation, and safe operating area constraints for high-voltage capacitive loads.

Technical Context

The OPA453TA-1G3 employs a compensated internal architecture requiring minimum closed-loop gain of 5 for stability, distinguishing it from the unity-gain-stable OPA452. Its 7.5MHz GBW and ±23/–38V/µs slew rate enable fast settling (1µs to 0.1% at G=+5) while maintaining low THD+N (0.0008% at 1kHz).

Thermal protection integrates a dedicated Flag pin that sources 100–165µA during shutdown (junction ≥160°C) versus ≤1.0µA in normal operation, enabling direct CMOS/HCT logic interfacing without external amplification. The TO-220-7 package tab is electrically tied to V–, requiring isolation from heatsink ground when used in single-supply or asymmetric configurations.

Key Specifications

Pinout & Package

OPA453TA-1G3 uses a 7-lead TO-220 (KC drawing) package with straight-formed leads and electrically connected metal tab tied to V–. Mounting requires thermal isolation from system ground if V– is not chassis ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA453FA and OPA452TA, the OPA453TA-1G3 uniquely combines TO-220 through-hole mechanical robustness, minimum-G≥5 speed optimization, and factory-trimmed DC accuracy - making it optimal for prototyping, repair, and medium-volume industrial controls where leaded packages simplify thermal management and manual assembly.

Availability

OPA453TA-1G3 is available at Aetrix Electronics and suitable for piezoelectric actuation, servo motor control, and high-voltage test equipment requiring stable component supply with guaranteed long-term availability and traceable lot history.

Supply support for OPA453TA-1G3 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 power management ICs.

The OPA453 product line targets high-voltage industrial and instrumentation applications demanding robust output drive, thermal resilience, and guaranteed specifications across extreme supply and temperature ranges.

FAQ

What is the minimum closed-loop gain required for stable operation of the OPA453TA-1G3?

The OPA453TA-1G3 requires a minimum closed-loop gain of 5 for stable operation. Unlike the unity-gain-stable OPA452, this device is internally compensated for higher gains to achieve its 7.5MHz bandwidth and ±38V/µs slew rate. Operating below G=5 without external compensation risks oscillation or excessive ringing, especially with capacitive loads. Always verify stability using small-signal step response testing under actual load conditions.

How does the Flag pin on the OPA453TA-1G3 function during thermal shutdown?

The Flag pin on the OPA453TA-1G3 is an open-collector output that sources 100–165µA (typical 140µA) when the junction temperature reaches +160°C, indicating thermal shutdown activation. During normal operation, it draws ≤1.0µA. This current can directly drive CMOS or HCT logic inputs using a simple pull-up resistor (e.g., 39kΩ for 5V logic), enabling real-time system-level thermal fault detection without additional sensing circuitry - a key design advantage of the OPA453TA-1G3.

Can the OPA453TA-1G3 operate from asymmetric power supplies, such as +70V and –10V?

Yes, the OPA453TA-1G3 supports asymmetric supplies with total voltage up to 80V (e.g., +70V/–10V). Its specifications - including input common-mode range, output swing, and thermal protection - remain valid across ±10V to ±40V per rail. However, note that the TO-220 tab is electrically connected to V–, so in asymmetric configurations, the tab voltage equals the negative rail. Ensure mechanical mounting avoids unintended grounding of the tab if V– is not system ground.

What is the maximum capacitive load the OPA453TA-1G3 can drive without external compensation?

The OPA453TA-1G3 can reliably drive ≤100pF capacitive loads in unity-gain follower configuration without external compensation, as verified by typical small-signal step response data. For larger loads (e.g., >1nF) or lower gains, external compensation (e.g., series resistor + feedback capacitor) is required to maintain phase margin and prevent peaking or oscillation. Refer to Figure 5 and associated text in the SBOS127C datasheet for validated RC network values.

Is the OPA453TA-1G3 pin-compatible with the OPA452TA in the same TO-220-7 package?

Yes, the OPA453TA-1G3 and OPA452TA share identical TO-220-7 pinout (KC drawing), pin functions, and mechanical dimensions, enabling direct PCB footprint reuse. However, they are not functionally interchangeable without circuit review: OPA453TA-1G3 requires G≥5 for stability, while OPA452TA is unity-gain stable with lower bandwidth (1.8MHz) and slew rate (±7.2/–10V/µs). Swapping them necessitates verifying gain configuration and bandwidth requirements.