Texas Instruments OPA548FKTWTG3

Overview

OPA548FKTWTG3 from Texas Instruments is a high-voltage, high-current operational amplifier designed for precision power amplification in demanding analog systems. It delivers ±3-A continuous output current, supports ±4 V to ±30 V dual supplies (or 8–60 V single supply), and features adjustable current limiting (0–5 A), thermal shutdown with status reporting, and output disable control. It is used in semiconductor test equipment, ultrasound scanners, and programmable power supplies where robust drive capability and protection are critical.

For engineers reviewing the OPA548FKTWTG3 datasheet, OPA548FKTWTG3 pinout, OPA548FKTWTG3 application, or OPA548FKTWTG3 equivalent, key selection considerations include its 7-pin TO-263 (DDPAK) package, E/S pin dual-function enable/status interface, ±10-mV input offset voltage, 10 V/µs slew rate, and thermal shutdown threshold at 160°C - all verified in TI's SBOS070D production data sheet.

Technical Context

The OPA548FKTWTG3 uses a PNP-input stage with uncompensated bias currents, requiring matched external resistances to minimize offset errors. Its high-current output stage employs temperature-compensated class A/B biasing to reduce crossover distortion while enabling stable operation into reactive loads when externally compensated.

Current limiting is implemented via indirect load sensing at the ILIM pin, accepting a 0–330 µA control signal - not a series power resistor - allowing precise, low-power digital or analog adjustment from 0 A to 5 A. The E/S pin simultaneously enables output stage disable (reducing quiescent current to 6 mA) and reports thermal shutdown status via voltage level shift (3.5 V → 0.35 V relative to V–).

Key Specifications

Pinout & Package

The OPA548FKTWTG3 is housed in a 7-lead DDPAK (TO-263) surface-mount package with exposed copper thermal tab (10.10 mm × 8.89 mm nominal body size), optimized for PCB-mounted heatsinking and high-power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA548FKTWTG3, OPA547FKTWT offers lower cost but forfeits programmable current limiting and thermal monitoring, while LM675T/NOPB provides basic high-current amplification but demands external components to match OPA548FKTWTG3's integrated protection and control features.

Availability

OPA548FKTWTG3 is available at Aetrix Electronics and suitable for semiconductor test equipment, ultrasound scanner development, and programmable power supply designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for OPA548FKTWTG3 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 precision amplifiers, power management, and signal chain solutions.

The OPA548FKTWTG3 belongs to TI's high-voltage, high-current op-amp product line, engineered for applications demanding robust power delivery, integrated protection, and system-level controllability - especially in automated test, medical imaging, and industrial instrumentation.

FAQ

What is the maximum continuous output current specification for the OPA548FKTWTG3?

The OPA548FKTWTG3 delivers ±3 A continuous output current into resistive loads at specified operating conditions. This rating is validated across the –40°C to +85°C ambient temperature range with adequate heatsinking. Peak current capability reaches ±5 A for short durations, but sustained operation above ±3 A requires careful thermal design per the device's SOA curve and RθJA = 30.2°C/W (DDPAK package).

How does the ILIM pin on the OPA548FKTWTG3 set the current limit?

The ILIM pin on the OPA548FKTWTG3 accepts a control current (0–330 µA) to set the output current limit from 0 A to 5 A. Connecting an external resistor between ILIM and V– implements Equation 1: I_LIM = (15000 × 4.75) / (13750 Ω + R_CL). For example, a 14.7-kΩ resistor sets ~2.5 A. Leaving ILIM open yields 0 A; tying it directly to V– yields ~5 A. This method avoids power loss in series sense resistors.

Can the OPA548FKTWTG3 operate from a single supply, and what is the input common-mode range?

Yes, the OPA548FKTWTG3 operates from a single supply of 8 V to 60 V. Its input common-mode range extends to (V–) – 0.2 V on the negative side and (V+) – 3 V on the positive side, enabling true ground-referenced inputs even with V– = 0 V. This supports direct interfacing with sensors and DACs in single-supply systems without level-shifting circuitry.

What function does the E/S pin serve on the OPA548FKTWTG3, and how is it used?

The E/S (Enable/Status) pin on the OPA548FKTWTG3 serves two roles: applying < (V–) + 0.8 V disables the output stage in 1 µs and reduces quiescent current to ±6 mA; monitoring the pin voltage detects thermal shutdown (drops from ~3.5 V to ~0.35 V relative to V–). It supports both functions simultaneously - e.g., a microcontroller can assert disable and read fault status on the same pin.

What package type and thermal characteristics apply to the OPA548FKTWTG3?

The OPA548FKTWTG3 uses a 7-lead DDPAK (TO-263) surface-mount package with an exposed copper thermal tab (10.10 mm × 8.89 mm). Its thermal metrics include RθJA = 30.2°C/W, RθJC(bot) = 0.2°C/W, and ψJB = 14.3°C/W. The low bottom-side thermal resistance enables efficient heat transfer to the PCB, making it suitable for high-power applications when mounted on a 2-oz copper plane with thermal vias.