STMicroelectronics VND5T035LAK-E

Overview

VND5T035LAK-E from STMicroelectronics is a dual-channel high-side power switch IC for 24 V automotive systems, integrating analog current sense and latch-off protection. It features 35 mΩ on-state resistance per channel, 42 A typical current limitation, AEC-Q100 qualification, and operates across 8–36 V supply range-designed for driving resistive, inductive, or capacitive loads in body control modules and LED lighting.

For engineers reviewing the VND5T035LAK-E datasheet, VND5T035LAK-E pinout, VND5T035LAK-E application, or VND5T035LAK-E equivalent, key selection criteria include its dual-channel analog current sensing ratio (KLED = 1690–7210), thermal shutdown latch behavior, FR_Stby reset timing (2–24 µs), and PowerSSO-24 package thermal resistance (RthJC = 2 °C/W).

Technical Context

This monolithic VIPower device implements active clamp-based overvoltage protection (VCC clamp up to 70 V), undervoltage shutdown (5 V typ.), and proportional current sense with multi-range K-factors (K0 to K4) calibrated across -40 °C to 150 °C. Each channel independently latches off under overload, short-to-VCC, or thermal shutdown (TTSD = 150–200 °C), requiring a low pulse on FR_Stby for recovery.

The logic inputs are CMOS-compatible with 0.25 V hysteresis and ±1 mA input current; CS pins deliver fault-indicating current (ISENSEH = 4.9–12 mA in fault) rather than voltage, enabling robust diagnostics even with long trace routing. Off-state openload detection triggers at VOUT > 2–4 V with <20 µs delay.

Key Specifications

Pinout & Package

Package: PowerSSO-24 (exposed thermal pad connected to VCC), surface-mount, RoHS-compliant, AEC-Q100 qualified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel high-side driver applications.

Compared with TPS2HB50-Q1 and VNQ7E100AJTR, VND5T035LAK-E uniquely delivers dual-channel analog current sense with multi-point K-factor calibration, hardware FR_Stby reset, and optimized electromagnetic emission - making it the only choice for AFS LED drivers and safety-critical BCMs requiring deterministic fault recovery and wide-range current monitoring.

Availability

VND5T035LAK-E is available at Aetrix Electronics and suitable for automotive body control modules, LED headlamp systems, engine bay solenoid control, and industrial 24 V PLC output stages requiring stable component supply, AEC-Q100 compliance, and production-ready thermal performance.

Supply support for VND5T035LAK-E 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

VND5T035LAK-E belongs to ST's VIPower M0-7 family of high-side drivers, engineered specifically for robust, diagnostic-rich power distribution in 12 V/24 V automotive ECUs - emphasizing latch-off safety, EMC resilience, and seamless integration with microcontroller-based control architectures.

FAQ

What is the function of the FR_Stby pin, and how must it be driven?

The FR_Stby pin serves dual roles: a low pulse (≥2 µs) resets latch-off conditions (overload, thermal shutdown), and holding it low with all INx inputs disables outputs and activates ultra-low-power standby (I_S = 2 µA). It must be driven by a CMOS-compatible signal with VIH ≥ 2.1 V and VIL ≤ 0.9 V; floating is not allowed per datasheet Table 2.

How does the current sense output behave during fault conditions?

During overload, short-to-VCC, or off-state openload, the CS pin transitions from proportional I_SENSE = I_OUT/K to a high-current fault state (I_SENSEH = 4.9–12 mA at V_CC = 24 V), independent of load current. This provides unambiguous fault signaling without requiring additional comparators or ADC thresholds.

Can VND5T035LAK-E drive inductive loads without external flyback diodes?

Yes - the device integrates an active demagnetization clamp that limits V_OUT to V_CC − 58 V during turn-off, absorbing up to 250 mJ (L = 2.3 mH). External diodes are unnecessary for most automotive solenoids and valves, though layout inductance must stay below 40 µH to avoid oscillation during short-circuit events.

What PCB layout practices maximize thermal performance in PowerSSO-24?

Maximize copper area (≥8 cm²) connected to the exposed VCC tab using ≥6 thermal vias (0.3 mm diameter) to inner ground/power planes. Per Figure 27, R_thJA drops from ~45 °C/W (minimal pad) to ~25 °C/W (8 cm² copper), enabling 10 A continuous operation at 150 °C ambient when one channel is active.