STMicroelectronics VN540-E

Overview

VN540-E from STMicroelectronics is a single high-side smart power solid-state relay in PowerSO-10 package, designed for driving resistive or inductive loads with one side grounded. It operates from 10 V to 36 V supply, delivers up to 2.8 A continuous output current, features 50 mΩ R_DS(on), built-in current limiting, thermal shutdown, and open-drain diagnostic output - used in automotive body control modules for headlight and fan control.

For engineers reviewing the VN540-E datasheet, VN540-E pinout, VN540-E application, or VN540-E equivalent, key selection criteria include its 2.8 A DC current limit, V_demag = V_CC − 55 V fast demagnetization capability, loss-of-ground protection, undervoltage shutdown at 5.0–8.0 V, and diagnostic status signaling under overtemperature or fault conditions.

Technical Context

The VN540-E integrates a high-side MOSFET switch with VIPower technology, combining power stage, protection logic, and diagnostics in a monolithic IC. Its active current limiter responds within 100 µs to shorted loads, preventing system voltage collapse while maintaining safe junction temperature via thermal shutdown at 150–170 °C.

It uses digital input logic with 0.5 V hysteresis (V_IL ≤ 2.0 V, V_IH ≥ 3.5 V), clamped at 32 V, and provides an open-drain status output that pulls low during overtemperature or undervoltage events - enabling real-time fault detection without external components.

Key Specifications

Pinout & Package

Package: PowerSO-10 - thermally enhanced surface-mount package with exposed drain pad for efficient heat dissipation; RoHS-compliant, ECOPACK® certified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side smart switch applications.

Compared with VN540-E, STVN5012AJTR offers compact size but reduced drive capability and no fast demagnetization, while INFINEON BTS716G adds reverse-battery protection at the cost of higher on-resistance and incompatible footprint - making VN540-E optimal for medium-power inductive loads requiring robust diagnostics and thermal resilience.

Availability

VN540-E is available at Aetrix Electronics and suitable for automotive lighting control, engine cooling systems, industrial solenoid actuation, and commercial HVAC blower management requiring stable component supply across extended temperature and voltage ranges.

Supply support for VN540-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, specializing in automotive, industrial, and power management ICs with vertical manufacturing capabilities and AEC-Q100 qualification expertise.

The VN540-E belongs to ST's VIPower M0-7 family of high-side drivers, engineered specifically for automotive body electronics where reliability, integrated protection, and diagnostic transparency are critical in harsh environments.

FAQ

What is the maximum continuous output current of the VN540-E?

The VN540-E delivers up to 2.8 A continuous output current under specified thermal conditions (T_J ≤ 85 °C, R_thJA ≤ 50 °C/W). At higher ambient temperatures or with limited heatsinking, current must be derated per the thermal data table in the datasheet - peak short-circuit current reaches 4 A for brief durations before current limiting engages.

Does the VN540-E require an external pull-up resistor on the STAT pin?

Yes - the STAT pin is open-drain and requires an external pull-up resistor (typically 4.7 kΩ to V_CC) to generate a valid logic-high signal during normal operation. During fault conditions (overtemperature, undervoltage, or short-circuit), the internal FET pulls STAT low, allowing microcontroller GPIO to detect the event without additional level-shifting circuitry.

Can the VN540-E drive inductive loads without external flyback diodes?

No - although the device features fast demagnetization (V_demag = V_CC − 55 V), an external freewheeling diode must still be placed across the inductive load to safely dissipate stored energy. The internal clamp only defines the maximum allowable flyback voltage; it does not replace the need for a dedicated flyback path.

How does the VN540-E handle loss-of-ground conditions?

The VN540-E continuously monitors the GND terminal and disables the output if a loss-of-ground condition is detected - preventing uncontrolled current flow through parasitic paths. This protection is implemented internally and does not require external sensing components; the STAT pin reflects this fault as a low state after a brief delay consistent with other protection events.