STMicroelectronics VN05N

Overview

VN05N from STMicroelectronics is a high-side smart power solid-state relay IC designed for driving resistive or inductive loads with one side grounded. It delivers 13 A continuous output current at Tc=25°C, features 5 V logic-level input compatibility, integrated thermal and under-voltage shutdown, and an open-drain diagnostic output for open-load and over-temperature detection - used in automotive body control modules for headlight and fan switching.

For engineers reviewing the VN05N datasheet, VN05N pinout, VN05N application, or VN05N equivalent, this page provides verified electrical parameters, PENTAWATT package details, functional truth table behavior, diagnostic signal timing, and validated alternatives for high-side load switching in harsh-environment industrial and automotive systems.

Technical Context

The VN05N integrates a VIPower MOSFET with embedded protection logic and diagnostics. Its internal architecture includes a temperature-sensing element adjacent to the power die, enabling fast thermal shutdown at 140 °C with automatic recovery at 125 °C, and a status output that asserts low during open-load (IOL = 5–180 mA) or over-temperature conditions.

It operates with supply voltage from 7 V to 26 V, supports reverse-battery protection via external Schottky diode configuration, and uses clamped logic inputs (VIH internally limited to ~6 V) with 0.5 V hysteresis to reject noise in automotive environments.

Key Specifications

Pinout & Package

The VN05N is housed in a PENTAWATT (5-pin, single-in-line) package with isolated heatsink tab (pin 3), optimized for high-power dissipation in compact PCB layouts. Thermal resistance junction-to-case is 2.2 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTS4140N and MC33883, the VN05N uniquely combines open-load detection, under-voltage lockout, and fast thermal response in a single PENTAWATT package - making it optimal for cost-sensitive, safety-aware automotive lighting and industrial load switching where full diagnostic coverage is mandatory.

Availability

VN05N is available at Aetrix Electronics and suitable for automotive lighting control, industrial fan actuation, and off-highway solenoid valve driving requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for VN05N 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, with design centers and manufacturing facilities across Europe, Asia, and the Americas.

The VN05N belongs to ST's VIPower M0-3 high-side switch product line, engineered specifically for robust, diagnostic-capable load driving in automotive and industrial environments where reliability under electrical stress and thermal extremes is non-negotiable.

FAQ

What is the maximum continuous output current of the VN05N and under what thermal conditions?

The VN05N delivers 13 A continuous output current when case temperature (T_c) is maintained at 25 °C with adequate heatsinking. At T_c = 85 °C, output current derates to approximately 6 A per Figure 10 in the datasheet. This derating is governed by R_thj-case = 2.2 °C/W and maximum junction temperature of 150 °C.

How does the STATUS pin indicate open-load versus over-temperature conditions?

The STATUS pin is open-drain and pulls low for both open-load and over-temperature faults. Differentiation requires timing analysis: open-load detection activates >100 µs after turn-on (Table 7 note), while over-temperature triggers within milliseconds of thermal runaway. System firmware must monitor sequence and duration to distinguish fault types per truth table (Table 8).

Can the VN05N be used in 24 V commercial vehicle systems with load-dump transients?

Yes - the VN05N supports V_CC up to 26 V and features built-in clamp structures. When combined with a Schottky diode between Pin 1 (GND) and chassis ground (Figure 12), it withstands -26 V reverse battery and meets ISO 7637-2 Pulse 5a (load dump) requirements when properly decoupled with ≥100 µF bulk capacitance near V_CC.

Is external current sensing required for short-circuit protection?

No - short-circuit protection is fully integrated. The device detects over-current via internal sensing and shuts off the output within 1.5–5 ms (t_SC, Table 7) without external components. Recovery is automatic once junction temperature falls below 125 °C, eliminating need for manual reset or external fault latching circuitry.