STMicroelectronics TDE1747DP

Overview

TDE1747DP from STMicroelectronics is a monolithic high-current interface circuit designed to drive relays, lamps, and stepping motors in industrial control systems. It features open-ground protection, adjustable short-circuit current limiting (480 mA typical with 1.5 Ω external resistor), thermal shutdown with hysteresis, and operates from +10 V to +45 V supply. Its output saturation voltage is 1.15 V at 300 mA and 25 °C.

For engineers reviewing the TDE1747DP datasheet, TDE1747DP pinout, TDE1747DP application, or TDE1747DP equivalent, key selection considerations include its ±50 V absolute maximum input voltage rating, 1 A peak output current capability, integrated short-circuit protection to both ground and VCC, and Minidip-14 package compatibility with industrial-level thermal management requirements.

Technical Context

The TDE1747DP integrates a comparator-based driver stage with current-limiting feedback controlled by an external resistor, enabling precise peak output current adjustment without external sensing circuitry. Its thermal shutdown activates at junction temperatures exceeding +150 °C, with hysteresis preventing oscillation near trip point.

It supports wide common-mode input range (2 V to VCC–2 V), differential input voltage tolerance up to ±50 V, and delivers low-level output leakage current (<10 µA) while maintaining robust short-circuit immunity to both VCC and ground - critical for relay coil and lamp load switching in noisy industrial environments.

Key Specifications

Pinout & Package

Package: Minidip-14 (14-pin dual in-line plastic package), 20.0 mm × 8.5 mm footprint, 3.3 mm height, 2.54 mm pin pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ULN2803ADW and TBD62783AFNG, the TDE1747DP uniquely combines adjustable current limiting, open-ground monitoring, and bidirectional short-circuit protection in a single-channel monolithic solution - making it optimal for safety-critical industrial interfaces where fault coverage outweighs channel density or speed.

Availability

TDE1747DP is available at Aetrix Electronics and suitable for industrial relay control, lamp switching, stepping motor phase driving, and solenoid valve interfacing requiring stable component supply and long-term lifecycle support.

Supply support for TDE1747DP 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 power management, analog, and industrial interface solutions.

The TDE/TDF1747 product line was developed specifically for ruggedized industrial actuator interfaces - prioritizing fault resilience, wide supply operation, and simplified thermal design over speed or integration density.

FAQ

What is the purpose of the current-limiting resistor on Pin 6?

Pin 6 connects to an external resistor that sets the short-circuit current limit threshold. With RSC = 1.5 Ω, the device limits peak output current to ~480 mA. This resistor directly configures the internal current-sense amplifier gain, enabling precise, temperature-stable current limiting without external components.

Does TDE1747DP require a heatsink for 300 mA continuous operation?

Yes - at 300 mA and +85 °C ambient, the device dissipates ~0.35 W. With Rth(j-a) = 120 °C/W, junction temperature would reach ~127 °C, exceeding the +85 °C max operating ambient. A heatsink reducing Rth(j-a) to ≤80 °C/W is required per Figure 12 in the datasheet to maintain safe operation.

Can TDE1747DP drive loads referenced to VCC instead of ground?

No - the output is configured as a grounded-emitter (low-side switch) with open-collector behavior. It sinks current from the load to GND. To drive high-side loads, an external PNP transistor or PMOS stage is required; the IC itself does not support high-side switching topology.

How does open-ground protection function in practice?

The IC continuously monitors continuity between its Pin 5 (GND) and system ground via an internal current source and comparator. If resistance exceeds ~100 Ω, the output is forced off and remains disabled until ground continuity is restored - preventing uncontrolled load activation during ground fault conditions in field wiring.