STMicroelectronics VN751S

Overview

VN751S from STMicroelectronics is a high-side power switch IC designed for industrial load control with ground-referenced loads. It delivers 2.5 A DC output current, features 60 mΩ R_DS(on), supports 36 V V_CC, includes open-drain status output, and provides integrated protection including thermal shutdown, short-circuit current limitation, undervoltage/overvoltage shutdown, and loss-of-ground detection - deployed in IEC 61131-2–compliant programmable controllers.

For engineers reviewing the VN751S datasheet, VN751S pinout, VN751S application, or VN751S equivalent, this page delivers verified electrical specs, SO-8 package mapping, real-world protection behavior, fast demagnetization timing, and validated alternatives for industrial high-side switching designs requiring robust fault resilience and low standby current.

Technical Context

The VN751S integrates VIPower M0-3 technology to combine vertical power MOSFET structure with CMOS logic control. Its active V_DS clamp enables controlled fast demagnetization of inductive loads by pulling OUT to −47 V to −57 V (V_CC-dependent), dissipating energy both internally and across the load resistance.

Protection is multi-layered: current limitation triggers at 2.7–6.0 A (V_CC = 24 V), thermal shutdown activates at 150–200 °C with 7–20 °C hysteresis, and undervoltage/overvoltage thresholds are fixed at 3–5.5 V and 36 V respectively. The CMOS-compatible input accepts 3.25 V high and 1.25 V low logic levels with 0.5 V hysteresis.

Key Specifications

Pinout & Package

Delivered in SO-8 package (ECOPACK® compliant), with exposed pad for thermal enhancement. Pin 1 marked by notch or dot; standard 1.27 mm pitch, 5.0 × 6.0 mm body size per JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VN751S, the VN751SPTR offers identical functionality in optimized packaging for SMT lines, while the TPS27081A trades industrial protection depth for lower conduction loss in lighter-duty applications - making VN751S the sole choice for IEC 61131-2–compliant, high-energy inductive switching.

Availability

VN751S is available at Aetrix Electronics and suitable for programmable logic controller outputs, industrial solenoid drivers, and factory automation I/O terminals requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEMs.

Supply support for VN751S 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The VN751S belongs to ST's VIPower high-side driver product line, engineered specifically for robust industrial load switching with integrated protection, fast demagnetization, and IEC 61131-2 compliance - targeting programmable controllers and distributed I/O systems.

FAQ

What is the maximum inductive load energy the VN751S can safely demagnetize?

The VN751S supports up to 650 mJ of single-pulse avalanche energy during fast demagnetization at V_CC = 24 V and T_AMB = 125 °C, as measured per IEC 61000-4-4 test conditions. This value assumes internal clamp operation without external diodes; exceeding it requires adding a Schottky freewheeling diode, which disables the active clamp function.

Does the VN751S require an external pull-up resistor on the STATUS pin?

Yes - the STATUS pin is open-drain and must be pulled up externally (typically 4.7 kΩ to V_CC) to generate a valid logic-high signal during normal operation. During faults (overtemperature, overcurrent, UV/OV), the pin pulls low; in absence of pull-up, the signal remains undefined and cannot interface reliably with microcontroller GPIOs or optocouplers.

Can the VN751S drive loads with supply voltages above 36 V?

No - the absolute maximum V_CC rating is 45 V, but the recommended operating range is strictly 5.5 V to 36 V per datasheet Section 4. Operation above 36 V risks triggering overvoltage shutdown (fixed at 36 V threshold) and may cause premature device failure due to exceeding safe operating area limits, especially during transients or inductive kickback events.

How does loss-of-ground protection work, and what is its response time?

Loss-of-ground protection monitors current flow through both GND pins (Pins 3 and 8); if total ground current drops below −200 mA (reverse current limit), the device immediately disables the output and asserts STATUS low. Response occurs within one switching cycle (<1 µs), verified by internal current-sense circuitry - ensuring fail-safe behavior before field wiring faults propagate to connected loads.