VNI4140KTR-32 - Quad 1A High-Side SSR, 41V, PowerSSO-24 | STMicroelectronics
MPN: VNI4140KTR-32 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $5.12 | $512.00 |
| 500 | $4.61 | $2,305.00 |
| 1,000 | $4.1 | $4,100.00 |
VNI4140KTR-32 Overview
A high-side solid-state relay is a semiconductor switch that replaces mechanical relays by using power MOSFETs to switch DC loads, offering silent operation, long life, fast switching, and built-in protection. The VNI4140KTR-32 sits in the power distribution hierarchy as a smart high-side driver, which is a category of power management IC that combines a switching element, gate drive, and diagnostic feedback in one device for industrial automation, body electronics, and IEC 61131-2 compliant PLC outputs.
Key features include very low on-resistance (0.08 ohm typ), 1 A per-channel continuous current, integrated fast demagnetization of inductive loads, configurable latched or self-resetting thermal shutdown, per-channel open-load detection, short-circuit and overcurrent protection, and under-voltage lockout. The exposed bottom pad delivers a Rth(JA) suitable for 1 A operation on a standard 4-layer PCB without heatsinking.
Typical applications include four-channel industrial PLC digital outputs (IEC 61131-2), programmable logic controller field-side switches, industrial sensor power distribution, building automation relay replacement, and multi-channel 24 V solenoid/valve drivers. Each channel can replace an electromechanical relay with PCB-friendly footprint and silent operation.
Designers should ensure the charge pump bypass capacitor is placed as close to the VCC and GND pins as possible, route each output channel separately to minimize cross-talk, and use the exposed pad as the primary thermal path. The diagnostic output pin (DIAG) is multiplexed across channels and should be read in time-slotted fashion to identify the faulting channel during commissioning.
Drop-in alternatives for VNI4140KTR-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 VNI4140KTR-32 (same form factor and footprint) — differing in Package, Topology, Number of Channels, Continuous Output Current per Channel, Device Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
VNI4140K-32
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →VNI4140KTR
✅ Drop-In📋 Reference alternative (not in catalog)
VND5160AJTR-E
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.49 / Unit
View Datasheet →VNI4140KTR-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 |
| Supply Voltage Range | 10.5 V to 36 V |
| Maximum Operating Supply | 41 V |
| On-Resistance R_DS(on) (typ) | 0.08 ohm per channel |
| Continuous Output Current per Channel | 1 A |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | PowerSSO-24 (Exposed Bottom Pad) |
| Mounting Type | Surface Mount |
| Lead-Free / RoHS | Yes / Compliant |
| Integrated Protections | Overcurrent, Short-Circuit, Over-Temperature, Under-Voltage Lockout |
| Diagnostic Output | Yes (per-channel open-load, fault, thermal) |
| Charge Pump | Yes (integrated, for gate drive) |
| Fast Demagnetization of Inductive Loads | Yes (internal) |
| Conformance | IEC 61131-2 (industrial PLC outputs); ESD IEC ±25 kV |
VNI4140KTR-32 Pin Configuration
| Pin 1 | IN1 — Channel 1 logic input (CMOS/TTL compatible) |
| Pin 2 | OUT1 — Channel 1 high-side output |
| Pin 3 | NC — Not connected (per datasheet) |
| Pin 4 | GND — Ground reference |
| Pin 5 | OUT2 — Channel 2 high-side output |
| Pin 6 | IN2 — Channel 2 logic input |
| Pin 7 | VCC — Supply voltage (10.5 V to 36 V) |
| Pin 8 | IN3 — Channel 3 logic input |
| Pin 9 | OUT3 — Channel 3 high-side output |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | GND — Ground reference |
| Pin 12 | OUT4 — Channel 4 high-side output |
| Pin 13 | IN4 — Channel 4 logic input |
| Pin 14 | DIAG — Diagnostic / open-load flag output |
| Pin 15 | VCC-IS — Current sense / supply input |
| Pin 16 | CP — Charge pump capacitor node |
| Pin 17 | NC — Not connected (per datasheet) |
| Pin 18 | GND — Ground reference |
| Pin 19 | GND — Ground reference |
| 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) |
| Pin EP | GND (Exposed Pad) — Exposed bottom pad - primary thermal path, MUST be soldered to PCB copper |
Typical Applications
VNI4140KTR-32 is suitable for 6 applications: Industrial PLC Digital Outputs (IEC 61131-2), Building Automation Relay Replacement, Industrial Sensor Power Distribution, Solenoid and Valve Driver Arrays, Multi-Channel 24V DC Load Switching in Industrial PCs, Multi-Light LED Indicator Panels.
Industrial PLC Digital Outputs (IEC 61131-2)
The VNI4140KTR-32 is engineered to drive four 24 V digital outputs in industrial PLCs with IEC 61131-2 conformance. With 1 A per channel and integrated open-load detection, the part allows on-resistance conduction losses as low as 80 mV at full load, exceeding PLC electromagnetic compatibility requirements. Designers typically connect one channel per field-side terminal and read the multiplexed DIAG pin to detect wire breaks or shorts. The exposed pad PowerSSO-24 package is footprint-compatible with standard PLC I/O modules, simplifying PCB layout reuse across multiple product variants.
Recommended
Building Automation Relay Replacement
The VNI4140KTR-32 directly replaces electromechanical relays driving 24 V lighting, blinds, and HVAC actuators in building automation systems. Each of the four channels handles 1 A continuous load with silent semiconductor switching - no acoustic noise, no contact bounce, and a ten-fold longer operational life than equivalent mechanical relays. The integrated fast demagnetization handles inductive valve and motor windings common in building controls, while per-channel diagnostics let the host controller identify burned-out lamps or wiring faults for predictive maintenance alerts. PCB area shrinks versus equivalent 4-relay designs.
Recommended
Industrial Sensor Power Distribution
Use the VNI4140KTR-32 to switch four 24 V sensor supplies (proximity sensors, photoelectric switches, solenoid valves) from a single master controller. With 1 A per channel, multiple sensors can be powered from one output, and the channel-by-channel current limit rejects sensor short circuits without disrupting the other channels. The under-voltage lockout ensures sensors reset cleanly after supply brownouts common in industrial cabinets, while diagnostic feedback reports which channel faulted - critical for SCADA systems needing field-side fault localization. Total PowerSSO-24 PCB area is roughly 18 mm x 18 mm including thermal pad.
Recommended
Solenoid and Valve Driver Arrays
The VNI4140KTR-32 drives up to four proportional or on/off solenoid valves in hydraulic/pneumatic systems, with internal fast demagnetization of inductive energy handling the kick-back from valve coils without external freewheel diodes. Designers select the 1 A variant to handle the 700 mA-1 A typical hold currents of 24 V valves with margin for inrush. The exposed-pad PowerSSO-24 layout sustains all four channels at 1 A simultaneously in standard industrial enclosures with passive cooling, simplifying thermal design versus discrete MOSFET solutions.
Recommended
Multi-Channel 24V DC Load Switching in Industrial PCs
Embed the VNI4140KTR-32 inside industrial PCs and IIoT gateways to switch peripheral 24 V loads (fans, heaters, signal beacons, external indicator lights) from the host SBC. The four independent inputs IN1-IN4 are level-shifted to 3.3 V CMOS logic from the host processor, enabling software-controlled reboot of stuck peripherals. The diagnostic output pin folds back per-channel status to the host, supporting automatic recovery flow. With 1 A per channel and 36 V operational ceiling, it covers the standard industrial 24 V supply with substantial transient margin.
Recommended
Multi-Light LED Indicator Panels
The VNI4140KTR-32 operates as a 4-channel driver for industrial LED tower lights, panel indicators, and warning beacons running off 24 V. Each channel's 1 A continuous rating supports high-brightness LED stacks or incandescent pilot lamps with proper derating. The chip's thermal protection and short-circuit detection shut down a faulty channel without disabling the others, ensuring safety-critical indicators like E-stops remain functional. With built-in diagnostic feedback, the machine controller can light specific LEDs based on system state without external driver transistors.
Recommended
Recommended Products Summary
Engineering reference data for VNI4140KTR-32 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | VNI4140K-32 | VNI4140KTR | VND5160AJTR-E |
|---|---|---|---|---|
| Package | PowerSSO-24 | PowerSSO-24 - same | PowerSSO-24 - same | PowerSSO-12 (2-channel, smaller) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Channels | 4 | 4 | 4 | 2 |
| Output Current per Channel | 1.0 A | 1.0 A | 0.7 A | ~1.0 A |
| RoHS / Lead-Free | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes |
Key Differentiators
- Integrates 4 channels in a single PowerSSO-24 footprint (vs VND5160AJTR-E (2-channel PowerSSO-12))
- 1 A continuous per channel at full quad load (vs VNI4140KTR (no -32 suffix))
- Internal fast demagnetization of inductive loads (vs Discrete N-MOSFET + flyback diode solutions)
Design Notes
At full 1 A on all 4 channels simultaneously, per-channel conduction loss is 80 mW (I² x R_DS = 1² x 0.08) giving a total package dissipation of 320 mW. With the PowerSSO-24 exposed pad soldered to a 4-layer 1 oz copper pour (estimated Rth(JA) ≈ 30-40 °C/W from the datasheet thermal curves), the junction temperature rise remains under 13 K above ambient - well within the 150 °C thermal-shutdown ceiling. Designers MUST keep the exposed pad continuous and unbroken in the copper layers to reach the rated 1 A operation.
Place the charge pump fly capacitor directly between the CP pin and VCC with traces as short and wide as possible (per ST VIPower reference design). Use 100 nF X7R minimum, rated 50 V to handle supply transients above 36 V. Each channel's OUT pin should route directly to its load terminal with a TVS clamp (e.g., SMAJ33CA) within 10 mm to absorb switching transients from inductive loads.
Route IN1-IN4 as tightly-coupled matched-length traces to the host controller so the host can read the diagnostic output DIAG in a fixed time-slot per channel without cross-talk. Add a 10 kohm pull-down on DIAG to avoid floating during controller reset. The exposed bottom pad should be stitched with a 4 x 4 via array (0.3 mm via diameter, 0.6 mm pitch) directly to the inner ground plane to minimize thermal impedance.
Do not connect the GND pins and exposed pad to noisy motor-return paths; the part's diagnostic accuracy depends on a clean 0 V reference. Do not exceed 41 V on VCC even transiently (load-dump on 24 V trucks can hit 36 V easily). Avoid driving channels with capacitance > 22 nF without a current-limiting resistor, since the fast inrush into large capacitive loads can trip the overcurrent protection and latch the channel off.
Compliance Information
RoHS compliant per ST datasheet and LCSC product listing. Not AEC-Q100 qualified (industrial-grade part, not automotive). MSL rating per JEDEC J-STD-020 not specified in the verified data and should be confirmed on the device reel label before volume assembly.
