STMicroelectronics VN820PT

Overview

VN820PT from STMicroelectronics is a monolithic high-side driver IC fabricated in VIPower M0-3 technology, designed for driving grounded loads in automotive and industrial power distribution systems. It features 40 mΩ R_DS(on), 9 A continuous output current, 36 V maximum supply voltage, on/off-state open-load detection, and reverse battery protection. It operates in 13.5 V battery systems with integrated thermal shutdown and current limiting.

For engineers reviewing the VN820PT datasheet, VN820PT pinout, VN820PT application, or VN820PT equivalent, this page delivers verified electrical parameters, validated PPAK package layout, real-world load-detection timing behavior, and direct substitution guidance for automotive body control module (BCM) and smart fuse designs.

Technical Context

The VN820PT implements a fully protected high-side switch with CMOS-compatible input logic, active V_CC clamping compliant with ISO 7637-2 Pulse 1/2/3a/3b/5, and dual-mode open-load detection-using internal comparators to sense output voltage thresholds (V_OL = 1.5–3.5 V off-state; I_OL = 70–300 mA on-state). Its status pin provides fault reporting via open-drain output with programmable external pull-up.

Protection architecture includes undervoltage lockout (V_USD = 4 V typ., 0.5 V hysteresis), overvoltage shutdown (V_OV = 36 V), thermal shutdown at T_TSD = 150 °C (with 135 °C reset), and loss-of-ground detection that forces automatic turn-off. Current limitation is set at 9–20 A depending on V_CC and junction temperature.

Key Specifications

Pinout & Package

PPAK package: surface-mount, thermally enhanced, 11-terminal leadless package with exposed die-pad for low R_thj-case (1.9 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VN820SP and BTS724G, the VN820PT uniquely combines PPAK's space efficiency, full dual-mode open-load detection, and ISO 7637-2 Class C compliance in a single package - making it optimal for space-constrained automotive modules requiring zero-compromise diagnostics.

Availability

VN820PT is available at Aetrix Electronics and suitable for automotive body control modules, smart fuse replacements, engine bay power distribution, and industrial PLC output stages requiring stable component supply across extended temperature and transient stress conditions.

Supply support for VN820PT 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing and AEC-Q100 qualified processes.

The VN820PT belongs to ST's VIPower high-side driver product line, engineered specifically for automotive power distribution and intelligent protection - emphasizing diagnostic completeness, transient robustness, and thermal resilience in harsh environments.

FAQ

What is the recommended external pull-up resistor value for the STATUS pin?

A 10 kΩ pull-up to +5 V is recommended for the STATUS pin to ensure valid logic levels while limiting leakage current to <1 µA under normal operation. This value balances noise immunity against power consumption and ensures compatibility with standard microcontroller I/O thresholds. The resistor must be placed close to the STATUS pin to minimize trace inductance and avoid false fault triggering during fast transients.

Does VN820PT require an external flyback diode for inductive loads?

No external flyback diode is required: the VN820PT integrates an active demagnetization clamp with V_demag = V_CC − 41 V (min), enabling safe energy dissipation during inductive turn-off. This feature eliminates external diodes for most 12 V solenoid and relay applications, reducing BOM cost and PCB area - confirmed in ST application note AN4705.

How does off-state open-load detection work without an external pull-up on the OUTPUT pin?

Off-state open-load detection requires an external pull-up resistor (R_PU) between OUTPUT and a positive supply (e.g., +5 V). Without it, the device cannot distinguish between high-impedance open load and low-impedance short-to-ground. R_PU must satisfy two constraints: (1) keep V_OUT < 1.5 V when load is connected, and (2) raise V_OUT > 3.5 V when load is disconnected - values derived from I_L(off2) and V_OL specs in the datasheet.

Can VN820PT drive loads directly from a 24 V truck battery system?

Yes - the VN820PT supports V_CC up to 36 V DC and is qualified for 24 V commercial vehicle applications. Its overvoltage shutdown triggers at 36 V, and it withstands ISO 7637-2 Pulse 5 (+86.5 V/400 ms), covering worst-case load-dump scenarios in heavy-duty trucks. Thermal performance remains within spec with ≥0.44 cm² of 35 µm Cu on the PPAK thermal pad.