STMicroelectronics VNI2140J

Overview

VNI2140J from STMicroelectronics is a dual-channel high-side smart power solid-state relay fabricated in VIPower technology, driving resistive or inductive loads with one side grounded. It delivers 0.75 A nominal current per channel, features integrated short-circuit and junction/case overtemperature protection, and supports 3.3 V CMOS/TTL logic inputs - used in programmable logic controllers for industrial I/O control of solenoids and valves.

For engineers reviewing the VNI2140J datasheet, VNI2140J pinout, VNI2140J application, or VNI2140J equivalent, key selection criteria include channel thermal independence, open-drain diagnostic outputs for fault reporting, fast demagnetization capability (V_DEMAG = V_CC − 45 V), and compliance with IEC 61131-2 for industrial control safety requirements.

Technical Context

The VNI2140J integrates two independent high-side power switches with active current limiting (1 A per channel), undervoltage shutdown (7–9 V threshold), and dual thermal protection: junction shutdown at 150–170 °C and case shutdown at 125–146 °C with non-simultaneous restart to maintain system continuity. Each channel operates autonomously under overload, preserving functionality of unaffected channels.

It implements open-load detection via pull-up resistor configuration (V_OL = 2–4 V threshold), short-to-V_CC detection, and loss-of-ground protection using external resistor or diode solutions. Diagnostics are reported through open-drain outputs with low-level voltage ≤0.6 V under fault conditions.

Key Specifications

Pinout & Package

Package: PowerSSO-12™ - surface-mount, thermally enhanced 12-pin package with exposed thermal pad (TAB) connected to V_CC, optimized for PCB copper area ≥8 cm² to achieve R_th(JA) ≤40 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IPS2050H and VNI8200AJ, the VNI2140J uniquely balances dual-channel autonomy, 0.75 A sustained drive, and independent case thermal management - making it optimal for mission-critical dual-load control where channel isolation and diagnostic fidelity are non-negotiable.

Availability

VNI2140J is available at Aetrix Electronics and suitable for programmable logic control, industrial PC peripheral I/O, and numerical control machine applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical deployments.

Supply support for VNI2140J 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.

The VNI2140J belongs to ST's VIPower® high-side smart switch product line, engineered specifically for industrial automation systems demanding integrated protection, diagnostics, and IEC 61131-2 compliance in compact surface-mount packages.

FAQ

What is the maximum continuous output current per channel?

The VNI2140J delivers 0.75 A nominal continuous current per channel at T_J ≤ 125 °C with adequate PCB copper area (≥8 cm²). Its internal current limitation activates at 1 A, limiting fault current without external components. Derating applies above 85 °C ambient due to thermal resistance constraints (R_th(JC) = 1 °C/W per channel).

How does open-load detection work, and what external components are required?

Open-load detection requires an external pull-up resistor between V_CC and each output. When the load opens in OFF-state, output voltage rises above 4 V, pulling the corresponding Diag pin low. The resistor value must satisfy [(V_CC/V_OLMIN) − 1] × R_LOAD < R_PU < (V_CC − V_OLMAX)/|I_OUT(OFF1)MIN| - typically 10–47 kΩ for 24 V systems.

Can VNI2140J drive inductive loads without external flyback diodes?

Yes - the VNI2140J provides internal fast demagnetization with V_DEMAG ≥ V_CC − 45 V, enabling safe energy dissipation during turn-off. This eliminates the need for external freewheeling diodes in most 24 V industrial solenoid and relay applications, provided load inductance is ≤100 mH and peak current remains within 1 A limit.

What is the significance of non-simultaneous thermal restart between channels?

When both channels exceed case temperature threshold (T_CSD = 125–146 °C), their restart delays are staggered to avoid simultaneous current surges into the shared V_CC rail. This prevents supply voltage sag and ensures at least one channel remains operational during thermal recovery - critical for maintaining partial system function in PLC output modules.