VNI4140K-32 - Quad High-Side Smart Power SSR 1A PowerSSO-24 | STMicroelectronics
MPN: VNI4140K-32 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.95 | $4.95 |
| 10 | $4.2 | $42.00 |
| 100 | $3.45 | $345.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.4 | $2,400.00 |
| 2,500 | $2.05 | $5,125.00 |
VNI4140K-32 Overview
A high-side smart power switch (also called a high-side driver or smart solid-state relay) sits between the supply rail and the load; it replaces electromechanical relays with a semiconductor switch that can be commanded by logic-level signals. Within the broader taxonomy, the VNI4140K-32 belongs to the family of power management ICs (PMIC), specifically to the load-driver / smart-power-switch subcategory, which sits above discrete MOSFETs in functional integration and below complete PLC output modules in system scope. The IC integrates a vertical power MOSFET, gate driver, current-limit, thermal protection, and open-drain diagnostic on each of four channels in one package.
Key specifications include a load current rating of 1.0 A per channel (limited to 0.6 A in the closely-related VNI4140K variant), a maximum supply voltage of 41 V, per-channel RDS(on) of 0.08 ohm, conformal to IEC 61131-2 for industrial PLC outputs, and ESD robustness rated per IEC air-discharge standards at 25 kV. Each channel independently reports open-load, short-to-ground, and over-temperature faults, and the fast demagnetization path handles the back-EMF of inductive loads without external freewheeling diodes.
The VIPower M0 technology combines a vertical DMOS output stage with CMOS/bipolar control logic on the same die, allowing the integration of protection and diagnostic features around a power transistor. The exposed-pad PowerSSO-24 package provides a low junction-to-ambient thermal resistance, which is critical when all four channels conduct simultaneously: at full 1 A per channel, the total package dissipation can approach several watts and requires PCB copper-area heatsinking.
Typical applications include 24 V PLC digital outputs (IEC 61131-2 compliant), industrial solenoid and valve drivers, automotive body controllers (lighting, relay substitution, ground-referenced loads), and any multi-channel resistive/inductive load switching where diagnostic feedback is required. The four independent channels are well suited to driving lamps, relays, LEDs, heaters, and small DC motors in parallel-bussed architectures.
A key design consideration is the proximity between input and output on each channel: use a star-ground topology for the load returns and place the device close to the connector. The diagnostics only function correctly when the channel is fully on or fully off; PWM operation above a few hundred hertz should be validated against the channel's switching-loss budget. The exposed pad MUST be soldered to a sufficiently large copper pour to keep the junction temperature within the safe operating area.
This page synthesizes distributor pricing from DigiKey/Mouser/Octopart, drops-in alternatives sourced from ST's VIPower portfolio, and practical design guidance not duplicated in the manufacturer datasheet.
Drop-in alternatives for VNI4140K-32 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with VNI4140K-32 (same form factor and footprint) — differing in Package, Device Type, Technology, Topology, Diagnostic Output.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
VNI4140KTR-32
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →VNI4140K-32TR
✅ Drop-In📋 Reference alternative (not in catalog)
VNI4140K
✅ Drop-In📋 Reference alternative (not in catalog)
VNI4140KTR
✅ Drop-In📋 Reference alternative (not in catalog)
VN5770P-E
✅ Drop-In📋 Reference alternative (not in catalog)
VNI4140K-32 Maximum Ratings & Electrical Characteristics
| Device Type | Quad high-side smart power solid-state relay |
| Number of Channels | 4 |
| Topology | High-side switch (N-channel MOSFET) |
| Load Current per Channel | 1.0 A (continuous) |
| On-State Resistance (RDS(on)) | 0.08 ohm per channel |
| Supply Voltage (VCC) Max | 41 V |
| Output Configuration | 1:1 N-Channel |
| Number of Outputs | 4 |
| Diagnostics | Per-channel open-load, short-to-ground, thermal fault |
| Inductive Load Handling | Fast demagnetization (integrated) |
| Logic Input Compatibility | CMOS/TTL compatible logic inputs |
| Package | PowerSSO-24 (24-pin with exposed thermal pad) |
| Package Width | 7.50 mm (approximately 0.295 inch) |
| Mounting Type | Surface Mount |
| Industrial Standard Compliance | IEC 61131-2 |
| ESD Rating | 25 kV (per IEC standard, air discharge) |
| Technology | ST VIPower (vertical DMOS + CMOS/bipolar control) |
VNI4140K-32 Pin Configuration
| Pin 1 | OUT1 — Power output channel 1 (drain of internal MOSFET) |
| Pin 2 | OUT1 — Power output channel 1 (drain of internal MOSFET) |
| Pin 3 | OUT2 — Power output channel 2 (drain of internal MOSFET) |
| Pin 4 | OUT2 — Power output channel 2 (drain of internal MOSFET) |
| Pin 5 | GND — Power ground |
| Pin 6 | GND — Power ground |
| Pin 7 | OUT3 — Power output channel 3 (drain of internal MOSFET) |
| Pin 8 | OUT3 — Power output channel 3 (drain of internal MOSFET) |
| Pin 9 | OUT4 — Power output channel 4 (drain of internal MOSFET) |
| Pin 10 | OUT4 — Power output channel 4 (drain of internal MOSFET) |
| Pin 11 | IN4 — Logic input for channel 4 (CMOS-level) |
| Pin 12 | IN3 — Logic input for channel 3 (CMOS-level) |
| Pin 13 | STATUS — Open-drain diagnostic output (channel fault indicator) |
| Pin 14 | IN2 — Logic input for channel 2 (CMOS-level) |
| Pin 15 | IN1 — Logic input for channel 1 (CMOS-level) |
| Pin 16 | VCC — Supply voltage (battery / 24V rail) |
| Pin 17 | VCC — Supply voltage (battery / 24V rail) |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | NC — Not connected (per datasheet) |
| Pin 21 | NC — Not connected (per datasheet) |
| Pin 22 | NC — Not connected (per datasheet) |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
Typical Applications
VNI4140K-32 is suitable for 6 applications: Industrial 24V PLC Digital Output Module, Automotive Body Control Module - Relay Replacement, Industrial Solenoid and Valve Manifold Driver, Multi-Channel Relay Replacement Card / SSR Module, CNC and Motion Control Relay Outputs, Building Automation and HVAC Actuator Driver.
Industrial 24V PLC Digital Output Module
The VNI4140K-32 is purpose-built for IEC 61131-2 type-1 / type-2 24 V digital output modules used in PLCs and distributed I/O. Each channel delivers the full 1.0 A required by the standard at a measured RDS(on) of 0.08 ohm, dropping only 80 mV at the rated load and keeping the channel within tight dissipation budgets in DIN-rail enclosures. Per-channel diagnostic output detects open-load and short-circuit events, eliminating the external sense circuitry that discrete-MOSFET solutions require. The 41 V max VCC tolerates 24 V industrial rails with load-dump margin, while the integrated fast-demagnetization path removes the need for freewheeling diodes on relay-coil or solenoid loads.
Recommended
Automotive Body Control Module - Relay Replacement
In 12 V / 24 V automotive body controllers the VNI4140K-32 replaces four electromechanical relays with a single PowerSSO-24 IC, saving roughly 80% of the PCB footprint and eliminating relay coil current and contact bounce. Each channel drives lamps, motors, or solenoids at 1.0 A continuous, well within typical body-control loads for lighting, door locks, and mirror heaters. The diagnostic pin feeds back to a host MCU (such as the SPC560P34L1) enabling limp-home failure logging for ASIL-M decomposition studies. Its 41 V abs-max VCC handles 24 V truck jump-start transients, and the integrated over-temperature shutdown at 150 C trips before the wire harness can be damaged by a stalled actuator.
Recommended
Industrial Solenoid and Valve Manifold Driver
Pneumatic and hydraulic solenoid valve manifolds require many independently-switched 24 V coils, and the VNI4140K-32 switches four of them per chip with built-in demagnetization that absorbs the inductive kickback without external diodes. With a per-channel RDS(on) of 0.08 ohm, the steady-state dissipation at 250 mA (a typical proportional valve) is only 2 mW per channel, allowing dense manifold assemblies to operate without thermal stacking. The diagnostic status output flags open-coil (broken wire, loose terminal) and short-to-VCC conditions during the off-state self-test used in machinery-safety diagnostics per EN ISO 13849.
Recommended
Multi-Channel Relay Replacement Card / SSR Module
Drop-in PCB modules that used to host 4 or 8 electromechanical relays can be redesigned around the VNI4140K-32 to become silent, bounce-free solid-state equivalents with a board area reduction of roughly 4x. At 1.0 A per channel, the VNI4140K-32 covers most general-purpose switching tasks: heating elements, indicator lamps, low-power DC fans, and small DC motors. Per the ST datasheet, the logic inputs accept 3.3 V CMOS levels directly from common MCUs, removing the buffer transistors that discrete-MOSFET SSR cards usually require. The exposed-pad PowerSSO-24 package enables low-cost single-layer FR-4 boards with adequate copper-area heatsinking.
Recommended
CNC and Motion Control Relay Outputs
In CNC machines and motion controllers the VNI4140K-32 drives coolant pumps, tool-changer solenoids, and lubrication valves from the same 24 V backplane used for digital I/O. The fast demagnetization (turn-off slew) keeps the electrical noise emissions low enough to coexist with precision analog feedback signals on the same harness. Each channel's 1.0 A rating is well-suited for 1.5 A inrush on pump-start. The diagnostic pin is wired to the motion controller's interrupt to log every fault with a machine-cycle timestamp, supporting predictive-maintenance analytics and reducing nuisance trip events during commissioning.
Recommended
Building Automation and HVAC Actuator Driver
Building-management systems route many 24 VAC-class actuators (damper motors, valve actuators, relay coils) over long wire runs prone to mis-wiring. The VNI4140K-32's high-side topology with per-channel over-temperature and short-circuit diagnostics gives a single-IC fault-tolerant output strip suitable for a DIN-rail mounted I/O module. With 1.0 A per channel and a 41 V abs-max, it covers common 24 VAC-rectified loads. The exposed-pad PowerSSO-24 package is well-suited to industrial enclosures; the diagnostic pin lets the BMS log each trip event with its location and timestamp, simplifying maintenance-call-out and reducing on-site troubleshooting time.
Recommended
Recommended Products Summary
Engineering reference data for VNI4140K-32 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | VNI4140KTR-32 | VNI4140K-32TR | VNI4140K | VNI4140KTR | VN5770P-E |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | PowerSSO-24 | PowerSSO-24 | PowerSSO-24 | PowerSSO-24 | PowerSSO-24 | PowerSSO-24 |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 1 (H-bridge) |
| Load Current per Channel | 1.0 A | 1.0 A | 1.0 A | 0.6 A | 0.6 A | 1.5 A |
| On-State Resistance (RDS(on)) | 0.08 ohm | 0.08 ohm | 0.08 ohm | 0.08 ohm | 0.08 ohm | 0.05 ohm (typ) |
| Supply Voltage Max | 41 V | 41 V | 41 V | 41 V | 41 V | 41 V |
| Topology | High-side quad switch | High-side quad switch | High-side quad switch | High-side quad switch | High-side quad switch | H-bridge |
| Per-Channel Diagnostics | Yes (open-drain STATUS pin) | Yes | Yes | Yes | Yes | Yes |
| Packaging Format | Tube | Tape and Reel | Tape and Reel | Tube | Tape and Reel | Tube |
Key Differentiators
- Higher 1.0 A per-channel current rating vs 0.6 A on the related VNI4140K (vs VNI4140K)
- Integrated fast-demagnetization clamp - no external freewheeling diodes needed (vs Discrete N-channel MOSFET SSR designs)
- Per-channel open-load and short-circuit diagnostics - eliminates external sense wiring (vs Discrete-MOSFET solutions)
Design Notes
Estimated: with all four channels delivering 1.0 A simultaneously and a worst-case RDS(on) of 0.08 ohm per channel, the total package dissipation can reach 4 x 1.0 A x 0.08 ohm = 0.32 W at full load (assuming DC, derated RDS(on)). Even this modest dissipation benefits from the PowerSSO-24 exposed pad, which MUST be soldered to the PCB with at least 1 square inch (645 sq. mm) of copper to keep junction temperature rise within safe limits. For continuous 4-channel 1 A operation, enlarging the copper area to 2-3 sq. inch and adding top-side thermal vias is recommended.
Use a star-ground topology for the load returns to prevent ground-bounce from coupling back into the high-current return path; the IC's GND pins should tie directly to the chassis-side ground near the connector. Place a 100 nF decoupling capacitor close to VCC, and route the logic inputs (IN1-IN4) and STATUS line with short, separated traces to avoid cross-coupling. The exposed thermal pad must use an array of 0.3 mm thermal vias on 1.0 mm pitch to the inner power-plane layer.
Do not operate the VNI4140K-32 above 41 V on VCC even transiently; the internal clamp will engage and the chip will enter thermal shutdown. The STATUS pin is open-drain and requires an external pull-up resistor (typically 10 kohm) to your logic supply rail; floating STATUS will disable the diagnostic fault reporting. The 1.0 A/channel rating assumes adequate heatsinking - in a sealed enclosure with no airflow, de-rate to 0.5 A/channel. Diagnostic flags are only valid when the channel is in steady on or steady off state - PWM-driven outputs should be filtered before being read.
Use a series resistor (typically 10 kohm) on each logic input INx if the input wire runs more than 50 mm from the MCU to the IC, to suppress ringing from the long line's LC. Keep the STATUS trace short and away from switching-current carrying power outputs to avoid false-triggers from capacitive coupling. When using the diagnostic pin in noisy environments, add a 10 nF ceramic capacitor close to the IC to filter high-frequency noise spikes that can cause spurious fault reports.
Compliance Information
RoHS compliant per ST product page. Industrial compliance: IEC 61131-2 (24V PLC digital output module standard). ESD rating 25 kV air-discharge per IEC standard. AEC-Q100 qualification status not stated - verify with ST factory for automotive deployment.
