STMicroelectronics VN771K13TR

Overview

VN771K13TR from STMicroelectronics is a quad-channel smart power solid-state relay in SO-28 package, integrating two VIPower™ M0-3 high-side switches and two OMNIFET II low-side switches for complete H-bridge DC motor control. It delivers 9 A typical current limitation per channel, 95 mΩ total R_DS(on) per bridge side, and operates up to 36 V supply voltage. Used in automotive seat/mirror actuators and industrial linear motion systems requiring fault-diagnosed bidirectional drive.

For engineers reviewing the VN771K13TR datasheet, VN771K13TR pinout, VN771K13TR application, or VN771K13TR equivalent, this page provides verified electrical specs, thermal behavior under H-bridge switching, diagnostic flag timing, and real-world protection thresholds - all validated against ST's Doc ID 12534 Rev 4.

Technical Context

The VN771K13TR implements dual independent high-side drivers with integrated thermal shutdown (150–200 °C trip), linear current limiting (6–15 A range), and open-load detection in both on/off states. Each high-side switch features undervoltage lockout (3–5.5 V) and overvoltage clamping (36 V threshold).

Its two low-side OMNIFET II channels provide auto-protected switching with built-in overtemperature intervention, drain-source clamp (40–55 V), and demagnetization voltage control (V_CC−41 to V_CC−55 V). Status feedback is delivered via open-drain diagnostic pin shared across high-side channels.

Key Specifications

Pinout & Package

SO-28 surface-mount package with exposed thermal pad (pin 6 GND serves as primary thermal path). Pin numbering follows standard SO-28 outline (Doc ID 12534 Fig. 53); pin 1 marked by dot or bevel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VN771K13TR, VN772K13TR offers higher current headroom but identical thermal and diagnostic behavior, while TPS27082L forces multi-chip implementation with reduced functional integration and missing off-state open-load detection - making it unsuitable for safety-critical H-bridge applications.

Availability

VN771K13TR is available at Aetrix Electronics and suitable for automotive seat controls, industrial valve actuators, medical infusion pumps, and robotics joint drivers requiring stable component supply across extended product lifecycles.

Supply support for VN771K13TR 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, designing and manufacturing silicon solutions for automotive, industrial, and power applications.

VN771K13TR belongs to ST's VIPower™ smart power family, engineered specifically for robust, diagnostic-rich motor control in harsh environments - emphasizing integrated protection, thermal resilience, and functional safety readiness.

FAQ

What is the maximum continuous output current per channel?

The VN771K13TR provides 9 A typical current limitation per channel at T_j = 125 °C, with linear limiting active across the full operating temperature range. Absolute maximum rated current is defined by thermal limits: 6 W power dissipation at T_C = 25 °C corresponds to ~7.5 A continuous in standard SO-28 mounting with 6 cm² copper pour.

How does the diagnostic pin indicate open-load conditions?

The DIAGNOSTIC pin pulls low during open-load detection in both on-state (I_OL < 50 mA) and off-state (V_OL > 1.5 V), as well as during overtemperature (>150 °C) or overcurrent events. The fault remains asserted until the condition clears and the device exits thermal shutdown or current limit mode.

Can VN771K13TR drive inductive loads without external flyback diodes?

Yes - integrated clamping circuits suppress inductive kickback: high-side switches feature V_CC-referenced clamp, while low-side switches include drain-source clamp (40–55 V) and demagnetization voltage control (V_CC−41 to V_CC−55 V), eliminating need for external diodes in standard H-bridge configurations.

What PCB layout considerations improve thermal performance?

Maximize copper area connected to pin 6 (GND) and the exposed thermal pad (if present per SO-28 variant); use ≥6 cm² of 2-oz copper with multiple thermal vias to inner ground planes. ST's Doc ID 12534 Fig. 47 shows recommended SO-28 PCB land pattern, and thermal resistance drops from 45 °C/W (free air) to ~25 °C/W with proper layout.