STMicroelectronics VN771KP-E

Overview

VN771KP-E from STMicroelectronics is a quad-channel smart power solid-state relay integrating two VIPower™ M0-3 high-side switches and two OMNIFET II low-side switches in a single SO-28 package. It delivers linear current limitation (9 A typical), 95 mΩ on-resistance per bridge side, 36 V max supply voltage, and integrated open-load/over-temperature diagnostics via open-drain status flag - enabling full H-bridge DC motor control in automotive body electronics and industrial actuators.

For engineers reviewing the VN771KP-E datasheet, VN771KP-E pinout, VN771KP-E application, or VN771KP-E equivalent, this device supports precise fault-aware motor commutation, thermal shutdown coordination across four channels, and real-time status feedback for safety-critical load management in 12 V/24 V systems.

Technical Context

The VN771KP-E implements dual independent high-side drivers with built-in thermal shutdown and linear current limiting, plus two fully protected low-side OMNIFET II switches featuring overvoltage clamping and auto-recovery protection. All four channels share common ground and VCC rails but operate with separate input and status signaling paths.

Its diagnostic architecture uses a shared open-drain STATUS pin to report open-load (in both ON/OFF states) and over-temperature events via voltage-level timing signatures, while undervoltage (4 V typ.) and overvoltage (36 V) protections are enforced independently per channel. The SO-28 package enables thermal coupling between high-side and low-side dies for coordinated thermal response.

Key Specifications

Pinout & Package

SO-28 surface-mount package with exposed thermal pad (pin 6 GND serves as primary thermal path); 28-pin layout optimized for H-bridge PCB routing with grouped high-side and low-side terminals and dedicated diagnostic output.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel smart power switch applications.

Compared with VN771KP-E, VN772KSPTR-E trades current capability for improved ruggedness in noisy environments, while TPS4H160-Q1 shifts architecture toward high-voltage, software-defined protection - making VN771KP-E optimal for cost-sensitive, fixed-function 12/24 V H-bridge applications requiring integrated low-side switching.

Availability

VN771KP-E is available at Aetrix Electronics and suitable for automotive body control modules, industrial actuator drives, and medical infusion pump motor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for VN771KP-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 specializing in automotive-grade power management, microcontrollers, and smart analog solutions with ISO/TS 16949-certified manufacturing.

VN771KP-E belongs to ST's VIPower™ smart-power family, engineered specifically for robust, integrated load driving in harsh automotive and industrial environments where reliability, diagnostics, and thermal resilience are critical.

FAQ

What is the function of the DIAGNOSTIC pin on VN771KP-E?

The DIAGNOSTIC pin is an open-drain status output that signals open-load conditions (in both ON and OFF states) and over-temperature events. Its voltage waveform encodes fault type: a short pulse indicates open-load, while a longer pulse signifies thermal shutdown. It requires an external pull-up resistor (typically 4.7 kΩ to VCC) and interfaces directly with MCU GPIO pins for real-time monitoring without additional logic.

Can VN771KP-E drive inductive loads like DC motors without external flyback diodes?

Yes - VN771KP-E integrates active clamp circuits on both high-side and low-side outputs. During turn-off of inductive loads, the internal clamping diodes and voltage-controlled clamp circuitry limit drain-source voltage to ≤55 V (high-side) and VCC−41 V (low-side), eliminating the need for external freewheeling diodes in standard 12 V/24 V motor applications.

How does the linear current limitation behave under varying temperature?

The current limit decreases gradually with rising junction temperature: from 9 A at 25 °C to ~6 A at 125 °C, as specified in Table 10. This linear derating is implemented via on-chip thermal sensing and ensures predictable, non-latching current control during sustained overload - enabling safe operation without abrupt shutdown during temporary overloads.

Is VN771KP-E pin-compatible with earlier VN771K variants?

Yes - VN771KP-E is a qualified automotive-grade variant (AEC-Q100 Grade 1) of the original VN771K, sharing identical pinout, electrical characteristics, and SO-28 package dimensions. Key enhancements include tighter parameter distributions, extended temperature validation (−40 °C to 150 °C), and full PPAP documentation support for automotive production use.