STMicroelectronics TDE1708DFT

Overview

TDE1708DFT from STMicroelectronics is an intelligent power switch supporting configurable high-side or low-side load driving, 6–48 V supply range, 250 mA continuous output current, internal +5 V regulator (±5% accuracy), and thermal/short-circuit/open-wire protections. It targets industrial proximity detectors requiring robust fault management and status indication via integrated LED driver.

For engineers reviewing the TDE1708DFT datasheet, TDE1708DFT pinout, TDE1708DFT application, or TDE1708DFT equivalent, key selection factors include its dual-mode switching topology, adjustable delay timing via external capacitor, GND/VS open-wire detection, and bipolar-process-based input hysteresis stability across –25 °C to +85 °C.

Technical Context

The device implements a bipolar-based control architecture with internal comparator thresholds (V_ith = 2–3 V, hysteresis = 300 mV) and adaptive blocking logic that disables output activation during overtemperature (>180 °C), overload, or short-circuit events. A minimum 25 µs delay ensures stable reset after fault clearance.

Its dual-output configuration supports either load-to-GND (high-side mode) or load-to-VS (low-side mode), with separate dedicated pins for each path (Pin 2 = high-side output; Pin 8 = low-side output). The regulated +5 V output (Pin 6) supplies external circuitry with ≤5 mA load capability and ±5% tolerance at I_reg < 5 mA.

Key Specifications

Pinout & Package

Package: DFN (4×4 mm), 8-pin, exposed thermal pad (lead frame connectable to GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VND5E025AKTR-E and TPS27081A, the TDE1708DFT uniquely combines dual-mode switching, integrated +5 V regulator, and bidirectional LED driver in a single DFN package-reducing component count and board area for proximity-sensing and actuation subsystems.

Availability

TDE1708DFT is available at Aetrix Electronics and suitable for industrial proximity sensors, PLC digital output modules, smart lighting actuators, and solenoid control systems requiring stable component supply across extended temperature ranges.

Supply support for TDE1708DFT 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 microcontrollers, power management ICs, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

The TDE1708DFT belongs to ST's intelligent power switch product line, engineered specifically for ruggedized industrial sensing and actuation where reliability under electrical stress, fault autonomy, and topology flexibility are critical.

FAQ

What is the maximum allowable supply voltage for TDE1708DFT?

The absolute maximum supply voltage (VS) is 50 V, with recommended operating range of 6–48 V. Exceeding 50 V risks permanent damage due to internal clamp breakdown. Reverse supply voltage tolerance is also rated at –48 V, enabled by integrated protection circuitry.

Can TDE1708DFT drive inductive loads directly?

Yes-it supports inductive loads with internal voltage clamping (55–70 V) and energy handling up to 100 mJ. No external flyback diode is required. However, layout must minimize parasitic inductance on VS and output traces to prevent overshoot beyond clamp limits.

How does the adjustable delay function work on Pin 3?

Pin 3 sources 2–6 µA to charge an external capacitor to 4 V (V_dth). Delay time = C × 4 V / I_dch; typical values range from 25 µs (no capacitor) to >2 ms (e.g., 1 nF yields ~0.65–2 ms). Capacitor must be ceramic with low ESR and placed close to Pin 3.

Is the +5 V regulator output short-circuit protected?

Yes-the V_reg pin has internal short-circuit current limiting of 6–50 mA depending on supply voltage (6 mA at VS = 35 V; 30 mA at VS = 48 V). Continuous shorting will not damage the regulator, but sustained overload may trigger thermal shutdown affecting overall device operation.