STMicroelectronics VN820SP

Overview

VN820SP from STMicroelectronics is a high-side driver IC designed for automotive and industrial load switching, featuring 40 mΩ R_DS(on), 9 A continuous output current, 36 V maximum supply voltage, CMOS-compatible input logic, and integrated open-load detection in both on/off states. It operates in 12 V/24 V battery systems driving solenoids, relays, and lamps.

For engineers reviewing the VN820SP datasheet, VN820SP pinout, VN820SP application, or VN820SP equivalent, key selection criteria include its active VCC clamp for ISO 7637-2 transient immunity, thermal shutdown with automatic restart, reverse battery protection via external network, and status pin reporting of fault conditions including overtemperature, undervoltage, and output short-to-VCC.

Technical Context

The VN820SP implements a monolithic VIPower M0-3 process high-side switch with integrated logic driver, current limiter, thermal sensor, and diagnostic status circuitry. Its architecture includes active clamping on VCC (±41 V absolute max), dual-mode open-load detection (requiring external pull-up for off-state), and precise hysteresis-based undervoltage (4 V typ) and overvoltage (36 V) shutdown thresholds.

Protection functions are tightly coupled: under overload, current limiting engages first (9–20 A range), followed by thermal shutdown at 150–200 °C with 135 °C reset hysteresis; ground loss triggers immediate turn-off; and reverse battery events are mitigated via external diode/resistor networks per ST's recommended schematics.

Key Specifications

Pinout & Package

PowerSO-10™ package: 10-pin surface-mount power package with exposed thermal pad, optimized for high-current automotive PCB layouts. Pin 1 is OUTPUT, Pin 10 is V_CC, and Pin 7 is STATUS - all pins defined per STMicroelectronics mechanical drawing P013P.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VN820SP, STVN820SPTR offers identical performance in reel format for manufacturing scalability, while TPS27082L trades diagnostic completeness and automotive-grade transient immunity for lower on-resistance in less demanding industrial settings.

Availability

VN820SP is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC outputs, commercial HVAC controls, and truck lighting systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for VN820SP 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.

VN820SP belongs to ST's VIPower family of intelligent power switches, engineered specifically for automotive-grade high-side load control with integrated diagnostics and robustness against harsh electrical environments.

FAQ

What external components are required for off-state open-load detection?

A pull-up resistor (R_PU) between OUTPUT and a positive supply (e.g., +5 V) is mandatory. Its value must satisfy two constraints: (1) V_OUT ≤ 1.5 V when load is connected (to avoid false detection), and (2) V_OUT ≥ 3.5 V when load is disconnected. ST recommends connecting R_PU to a switched supply to limit leakage current during standby.

How does the VN820SP handle inductive load demagnetization energy?

The device features an internal V_DEMAG clamp that limits turn-off output voltage to V_CC − 41 V (min) during inductive flyback. With a 6 mH load and 3 A current, it safely absorbs up to 481 mJ of switching energy, verified per single-pulse test at T_j = 150 °C - eliminating need for external freewheeling diodes in many cases.

Can the STATUS pin drive an LED directly without a buffer?

Yes - the STATUS pin is an open-drain output rated for 1.6 mA sink current. A 3.3 kΩ resistor to +5 V yields ~1.5 mA drive, sufficient for standard indicator LEDs. However, for noise-immune digital interfacing to MCUs, ST recommends adding a 10 kΩ pull-up and filtering capacitor (100 pF) to suppress glitches during transient events.

Is reverse battery protection built-in or externally implemented?

Reverse battery protection is not internal - it requires external implementation per ST's Application Schematic (page 9). Two validated methods exist: (1) a series resistor (R_GND) sized to limit reverse current to <600 mV / I_S(on)max, or (2) a small-signal diode (D_GND) in the ground path, optionally paralleled with 1 kΩ for inductive loads. Both methods are shared across multiple HSDs.