STMicroelectronics TDE1747FP

Overview

TDE1747FP from STMicroelectronics is a monolithic high-voltage, high-current interface driver IC designed to directly drive relays, lamps, and stepping motors in industrial control systems. It features open-ground protection, adjustable short-circuit current limiting (via single external resistor), thermal shutdown with hysteresis, and operates from +10 V to +45 V supply. Typical output current is 300 mA with 1.15 V saturation voltage at 25 °C.

For engineers reviewing the TDE1747FP datasheet, TDE1747FP pinout, TDE1747FP application, or TDE1747FP equivalent, key selection criteria include its ground-referenced output architecture, ±50 V absolute maximum input differential voltage, 1 A peak output current capability, thermal derating guidance for SO14 package, and compatibility with 24 V/45 V industrial power rails.

Technical Context

The TDE1747FP integrates a comparator-based driver stage with internal current sensing and thermal monitoring circuitry. Its output stage uses bipolar transistor technology enabling rail-to-rail output swing under load and robust short-circuit protection to both VCC and ground.

It implements hysteresis in thermal shutdown (Tj ≥ 150 °C) to prevent oscillation near trip threshold, and supports adjustable current limiting via external RSC - e.g., 1.5 Ω sets ISC ≈ 480 mA at +24 V. Input common-mode range extends from 2 V to VCC–2 V.

Key Specifications

Pinout & Package

Package: SO14 (Small Outline, 14-pin, surface-mount). Body dimensions: 10.92 mm × 7.95 mm × 1.52 mm (max height), pitch 2.54 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ULN2803A and TB6612FNG, the TDE1747FP delivers integrated fault protection (open-ground, VCC-short, thermal hysteresis) and single-resistor current tuning - reducing design validation effort and field failure risk in safety-critical industrial actuators.

Availability

TDE1747FP is available at Aetrix Electronics and suitable for industrial relay control, automated lamp signaling, stepper motor phase driving, and DC solenoid actuation requiring stable component supply across extended temperature and voltage ranges.

Supply support for TDE1747FP 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing capabilities.

The TDE/TDF1747 product line targets ruggedized interface drivers for industrial automation, emphasizing fault resilience, wide supply tolerance, and simplified thermal design in space-constrained control modules.

FAQ

What is the minimum supply voltage required for reliable operation of the TDE1747FP?

The TDE1747FP is specified to operate down to +10 V supply voltage. Below this level, output saturation voltage rises significantly and current limiting accuracy degrades. At +8 V, the device may still function but is outside guaranteed specifications - STMicroelectronics does not characterize performance below +10 V.

Can the TDE1747FP drive a 12 V relay coil directly from a 24 V supply?

Yes - the TDE1747FP's output stage sinks current to ground and is rated for VCC up to +45 V. When driving a 12 V relay from 24 V, the excess voltage drops across the relay coil. Ensure coil power dissipation remains within rating and verify thermal margin using R_th(j-a) = 120 °C/W and measured ambient.

Does the TDE1747FP require an external flyback diode when driving inductive loads?

Yes - although the device includes short-circuit protection to VCC, it does not integrate a clamp diode. An external fast-recovery diode (e.g., 1N4007 or MUR120) must be connected cathode-to-VCC, anode-to-output to suppress inductive kickback and prevent damage to the output transistor.

How does the open-ground protection mechanism work in practice?

Open-ground protection monitors continuity between Pin 3 (GND) and system earth reference. If resistance exceeds ~1 kΩ, internal circuitry forces the output into high-impedance state regardless of input signal. This prevents relay or lamp activation during ground wire disconnection - a documented failure mode in industrial field wiring.