STMicroelectronics TDE3247FPT

Overview

TDE3247FPT from STMicroelectronics is a monolithic high-current, high-voltage interface amplifier designed to drive lamps, relays, and stepping motors in industrial control systems. It delivers up to 300 mA output current, operates from 8 V to 30 V supply, features adjustable short-circuit protection to ground and VCC, internal thermal shutdown with hysteresis, and open-ground fault detection.

For engineers reviewing the TDE3247FPT datasheet, TDE3247FPT pinout, TDE3247FPT application, or TDE3247FPT equivalent, key selection criteria include its ±25°C to +85°C ambient operating range, 1.2–1.8 V output saturation voltage at 150 mA, 2–50 mV input offset voltage, and SO-14 package compatibility with industrial relay driver layouts.

Technical Context

The TDE3247FPT integrates a robust output stage with dual short-circuit protection-against both ground and VCC-and uses an external resistor to set peak current limit. Its thermal protection activates at ~150°C junction temperature with hysteresis to prevent oscillation near trip threshold.

It functions as a single-ended, non-inverting driver with rail-to-rail capable output swing (within 1.2–1.8 V of rails), common-mode input range from 2 V to VCC–2 V, and supports direct connection to microcontroller GPIOs or logic-level control signals without level-shifting.

Key Specifications

Pinout & Package

Package: SO-14 (Small Outline, 14-pin, ECOPACK® lead-free, JEDEC MS-012 compliant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current industrial driver applications.

Compared with ULN2003A and TBD62083AFNG, the TDE3247FPT provides superior fault visibility (open-ground flag), precise current tuning, and bidirectional short-circuit protection - critical for safety-rated industrial I/O where single-point failure modes must be detected and isolated.

Availability

TDE3247FPT is available at Aetrix Electronics and suitable for industrial relay driver modules, lamp control subsystems, and stepper motor interface circuits requiring stable component supply across extended production lifecycles.

Supply support for TDE3247FPT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

The TDE3247FPT belongs to ST's industrial interface amplifier product line, engineered specifically for ruggedized, high-reliability load-driving applications in harsh electrical environments with minimal external components.

FAQ

What is the minimum supply voltage required for reliable operation?

The TDE3247FPT operates reliably down to 8 V supply voltage. Below this, output saturation voltage rises nonlinearly and short-circuit current limiting becomes inaccurate. At 8 V, it still delivers ≥150 mA with ≤2.5 V saturation drop, making it usable in brown-out conditions typical of battery-backed 12 V systems.

How does the open-ground detection pin function electrically?

The open-ground pin (Pin 7) is an open-drain output that pulls low when the load is disconnected from ground while the output is active. It remains high-impedance otherwise. A pull-up resistor (typically 10 kΩ to VCC) is required externally to generate a valid logic-high signal when the load is intact.

Can the TDE3247FPT drive inductive loads without external flyback diodes?

No. The TDE3247FPT lacks internal clamp diodes. Driving relays or solenoids requires an external flyback diode (e.g., 1N4007) connected across the load with cathode to VCC. Omitting it risks destructive voltage spikes exceeding the 36 V absolute maximum rating on the output pin.

Is thermal derating required above 25°C ambient?

Yes. With R_th(j-a) = 110°C/W, junction temperature rises ~11°C per 100 mW dissipated. At 85°C ambient and 150 mA output into 10 Ω, power dissipation reaches ~2.25 W, pushing junction temperature beyond 150°C unless heatsinking or airflow is added. Derating curves in Figure 5 must be applied for continuous operation.