STMicroelectronics TDE1707DFT

Overview

TDE1707DFT from STMicroelectronics is an intelligent 0.5A high-side/low-side power switch IC with 6–48V supply range, integrated +5V AUX regulator, LED status driver, and configurable delay-on activation. It provides overload, short-circuit, thermal, reverse-polarity, and open-wire protection for industrial proximity detector loads.

For engineers reviewing the TDE1707DFT datasheet, TDE1707DFT pinout, TDE1707DFT application, or TDE1707DFT equivalent, key selection factors include its dual-mode switching topology, adjustable delay via external capacitor (pin 3), ±2mA LED driver capability, 1.1–1.6V output saturation voltage at 500mA, and DFN(4x4) package thermal resistance of 32°C/W (4-layer board).

Technical Context

The TDE1707DFT implements a bipolar-based smart power switch with internal fault blocking logic: abnormal conditions (overtemperature, overcurrent, input faults) generate a blocking signal that disables the output until stable operation resumes after a minimum 25ms delay. The delay is extended by adding capacitance between pin 3 and ground-no delay occurs at turn-on edge.

It supports two load configurations: high-side (load between VS and pin 2) and low-side (load between pin 8 and GND). Its +5V regulated AUX output (±0.5V accuracy, 5mA max) powers external sensors or interface circuitry, while the LED driver (3mA typ, ±1.6V drop) indicates real-time output state via sourcing or sinking current depending on configuration.

Key Specifications

Pinout & Package

Package: DFN(4x4), 8-pin, exposed thermal pad (lead-free ECOPACK® compliant). Thermal resistance R_thJA = 32°C/W (4-layer board, 4 vias).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VND5E025AKTR-E and IPS1025H, the TDE1707DFT uniquely integrates LED status feedback, +5V AUX regulation, and adjustable delay in a single DFN(4x4) package-making it optimal for cost-sensitive, space-constrained proximity detector interfaces requiring self-contained operation.

Availability

TDE1707DFT is available at Aetrix Electronics and suitable for industrial proximity detectors, PLC I/O modules, machine safety interlocks, and automated test equipment requiring stable component supply and long-term design continuity.

Supply support for TDE1707DFT 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 ICs, sensors, and automotive-grade devices.

The TDE1707DFT belongs to ST's Intelligent Power Switch family, engineered specifically for robust, self-protected load driving in industrial sensing and control applications-emphasizing reliability, integration, and ease of use in harsh environments.

FAQ

What is the maximum allowable supply voltage for the TDE1707DFT?

The absolute maximum supply voltage (VS) is 50 V, with recommended operating range from 6 V to 48 V. Exceeding 50 V risks permanent damage due to internal clamp limitations. The device includes internal voltage clamping (55–70 V) and reverse-supply protection up to –48 V, making it suitable for 48 V industrial systems with transient spikes.

Can the TDE1707DFT drive inductive loads such as solenoids or relays?

Yes-it is explicitly rated for inductive loads with energy handling up to 100 mJ per switching event. Internal voltage clamping, slow-down diode emulation, and thermal shutdown protect against back-EMF. Application Note AN495 confirms use with solenoids and includes snubber recommendations (e.g., C3 in Figure 8) for reliable operation.

How does the adjustable delay function work, and what capacitor value achieves ~1 ms delay?

The delay is generated by charging an external capacitor between pin 3 and ground using a 2–6 µA internal current source. With typical 4 µA bias, a 220 nF capacitor yields ~1 ms delay (t ≈ C × V_th/I ≈ 220nF × 4V / 4µA = 220 µs; actual delay is 0.65–2 ms per Table 5). Capacitor tolerance and temperature affect precision-use X7R ceramic for stability.

Is the +5V AUX output regulated, and what is its load capability?

Yes-the VREG pin delivers a tightly regulated +5 V output (4.5–5.5 V) with ≤5 mA total load capacity. At VS = 35 V, it supplies 6 mA; at VS = 48 V, 4 mA. It powers external sensors or logic directly; adding a 4.7 nF capacitor (per AN495) minimizes noise and improves stability under dynamic loads.