STMicroelectronics VN770KTR-E

Overview

VN770KTR-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, designed for complete H-bridge DC motor control. It delivers 9 A typical current limitation per channel, 220 mΩ total on-resistance per bridge side, 36 V max supply voltage, and integrated open-load/over-temperature diagnostics via open-drain status flag - enabling robust, self-protected bidirectional motor drive in automotive body electronics.

For engineers reviewing the VN770KTR-E datasheet, VN770KTR-E pinout, VN770KTR-E application, or VN770KTR-E equivalent, key selection considerations include its dual high-side + dual low-side topology, linear current limiting across all channels, undervoltage/overvoltage shutdown thresholds (4 V / 36 V), thermal shutdown at 150–200 °C, and SO-28 package thermal resistance of 20 °C/W junction-to-case.

Technical Context

The VN770KTR-E implements a monolithic chipset architecture with three VIPower™ M0-3 die: one dual high-side switch (HS1/HS2) and two independent low-side switches (LS3/LS4), each featuring autonomous protection logic. High-side channels integrate thermal shutdown, linear current limiting, and open-load detection in both on/off states; low-side channels add overvoltage clamping (V_DEMAG = V_CC−41 V) and auto-recovery thermal intervention.

Control is fully digital: HS inputs accept 3.25 V logic-high (VIH) with 0.5 V hysteresis; LS inputs tolerate ±20 mA input current and feature internal clamp diodes (±6.8 V / −0.7 V). The shared DIAGNOSTIC pin reports combined fault status (open load, overtemperature) as an open-drain signal with 0.5 V max low-level output at 1.6 mA sink.

Key Specifications

Pinout & Package

Package: SO-28 (Small Outline, 28-pin, 300 mil width), surface-mount, with exposed thermal pad (not electrically connected). Designed for PCB copper area ≥6 cm² to achieve R_thj-amb ≤ 40 °C/W in free-air conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VN770KTR-E, VN772KTR-E offers higher current capability and extended temperature range but demands tighter thermal management, while TPS2H160-Q1 provides configurable diagnostics at the cost of increased BOM count and design complexity to achieve equivalent H-bridge functionality.

Availability

VN770KTR-E is available at Aetrix Electronics and suitable for automotive seat control, industrial actuator drive, off-road winch interface, and medical infusion pump motor control requiring stable component supply and long-term lifecycle continuity.

Supply support for VN770KTR-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 headquartered in Geneva, Switzerland, specializing in automotive-grade power ICs, microcontrollers, and sensors with ISO/TS 16949-certified manufacturing.

The VN770KTR-E belongs to ST's VIPower™ smart-power family, engineered specifically for robust, self-protected DC motor control in harsh automotive and industrial environments where reliability, integration, and diagnostic coverage are critical.

FAQ

What is the maximum continuous current per channel under forced-air cooling?

At T_c = 70 °C with 6 cm² PCB copper area, the VN770KTR-E supports 7.5 A continuous per channel (derated from 9 A typ) based on R_thj-amb = 35 °C/W and T_j(max) = 150 °C. This assumes V_CC = 13 V and 220 mΩ effective R_DS(on). Exceeding this requires active heatsinking or reduced duty cycle.

Can the DIAGNOSTIC pin be wire-OR'd with other VN770KTR-E devices?

Yes - the open-drain DIAGNOSTIC pin supports wired-AND configuration. Pull-up to 3.3 V or 5 V is required externally. When multiple devices share one pull-up, any fault (open-load, overtemp, UVLO) pulls the net low, requiring additional logic or MCU GPIO reads to isolate the failing channel.

Does the VN770KTR-E require external flyback diodes for inductive loads?

No - integrated clamping circuits eliminate external diodes. High-side outputs feature 40–55 V drain-source clamp; low-side outputs provide V_DEMAG = V_CC−41 V turn-off clamping. These protect against inductive kickback up to rated energy levels defined in Figure 35 and Table 16 of the datasheet.

How does open-load detection work during motor startup?

Open-load detection activates within 200 µs after HS/LS turn-on (on-state) when load current remains below 20–80 mA, and within 1000 µs after turn-off (off-state) when voltage at DRAIN rises above 1.5–3.5 V. This allows confirmation of motor connection before full-current commutation begins.