STMicroelectronics TDE1798DP

Overview

TDE1798DP from STMicroelectronics is a 0.5A intelligent power switch IC designed for high-current industrial load control, featuring integrated short-circuit protection up to +35V supply, thermal shutdown with external reset, differential logic-compatible inputs, and open-ground fault detection. It drives inductive loads (e.g., solenoids, relays, DC motors) with fast demagnetization capability up to 150mJ without external clamping diodes.

For engineers reviewing the TDE1798DP datasheet, TDE1798DP pinout, TDE1798DP application, or TDE1798DP equivalent, key selection criteria include its ±35V absolute max supply rating, 0.5A continuous output current, differential input voltage tolerance up to ±50V, alarm output sourcing/sinking capability, and parallel operation support for higher current delivery.

Technical Context

The TDE1798DP integrates a protected NPN output stage with built-in current limiting, thermal foldback, and avalanche-rated output transistor (V_BRCEO = 65–110V). Its differential input architecture enables direct interfacing with TTL, CMOS, or isolated logic systems independent of V_CC, while supporting input voltages exceeding the supply rail.

It implements dual-mode reset control: automatic restart after overload removal when RESET is held high, or latched shutdown until external reset pulse when RESET is low. The device supports synchronous parallel operation via shared RESET and SYNC lines, enabling coordinated recovery across multiple units driving high-power loads.

Key Specifications

Pinout & Package

Package: MiniDIP-14 (14-pin plastic dual in-line package), 0.3-inch width, standard through-hole mounting compatible with IPC-7351B footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar intelligent power switch applications.

Compared with VND5E025AKTR-E and IPS1031H, the TDE1798DP offers unique differential input tolerance and open-ground detection - making it optimal for industrial field-side interfaces where ground potential shifts and wiring faults are common.

Availability

TDE1798DP is available at Aetrix Electronics and suitable for industrial solenoid control, PLC output modules, DC motor direction control, and high-voltage sensor interface applications requiring stable component supply and long-term obsolescence management.

Supply support for TDE1798DP 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, microcontrollers, and automotive ICs.

The TDE1798DP belongs to ST's Intelligent Power Switch family, engineered for rugged industrial actuation where reliability under electrical stress, thermal overload, and wiring faults is non-negotiable.

FAQ

What is the maximum demagnetization energy the TDE1798DP can safely absorb without external components?

The TDE1798DP is rated for up to 150mJ of demagnetization energy dissipation in its output stage. This value is validated under specified thermal conditions and accounts for internal power derating. Exceeding this limit risks thermal shutdown or permanent damage unless external clamping (e.g., Zener diode) is added per Figure 5 in the datasheet.

Can the TDE1798DP drive loads with output voltage below ground?

Yes - the TDE1798DP supports negative output swing relative to GND during inductive load demagnetization. Its output transistor's V_BRCEO rating (65–110V) allows the collector to go significantly below ground, enabling fast current decay without external components. This behavior is intrinsic to its NPN output architecture and avalanche-rated junction.

How does the RESET pin affect thermal shutdown recovery behavior?

When RESET is pulled low during thermal shutdown, the output remains latched off until RESET is raised high. If RESET is held high, the device automatically cycles ON/OFF until the fault clears. This dual-mode behavior is implemented via internal flip-flop logic and requires no external timing components - simplifying system-level fault recovery design.

Is parallel operation of multiple TDE1798DP devices supported, and what precautions apply?

Yes - multiple TDE1798DP units can be paralleled for higher current. Key requirements: tie all RESET pins together, ensure matched PCB layout and trace lengths, and use identical load connections. Due to V_BRCEO dispersion, external clamping is recommended for parallel configurations driving >150mJ total energy to avoid single-device overstress.