Skyworks Solutions Inc. SI8340XEN1-IFR

Overview

SI8340XEN1-IFR from Skyworks Solutions is a 4-channel isolated smart high-side switch IC designed for industrial load control in PLCs and motion controllers. It delivers 700 mA continuous current per channel (RON = 155 mΩ), supports 9–32 V switch supply and 2.25–5.5 V logic supply, and integrates galvanic isolation with >100 kV/µs CMTI for driving solenoids, relays, and lamps.

For engineers reviewing the SI8340XEN1-IFR datasheet, SI8340XEN1-IFR pinout, SI8340XEN1-IFR application, or SI8340XEN1-IFR equivalent, this device offers SPI+parallel interface flexibility, eight diagnostics via status registers, fast 10 µs update rate, inrush current mode (8 A/20 ms), and multi-voltage clamp for unlimited EAS handling-critical for robust industrial I/O design.

Technical Context

The SI8340XEN1-IFR implements four independent high-side switches with CMOS-based galvanic isolation, each featuring integrated voltage, current, and temperature sensing. Its RF-modulated isolation barrier enables fault-tolerant bidirectional communication between logic and power domains without startup initialization.

Switch control uses dual-path architecture: parallel inputs + OE pin for real-time switching, plus dedicated SPI interface (MOSI/MISO/SCLK/NSS) for full diagnostic access-including eight distinct reports (overcurrent, overtemperature, open-circuit, VDD2 warning, communication error). Diagnostics operate independently of switch control signals via separate isolation channels with constant error checking.

Key Specifications

Pinout & Package

SI8340XEN1-IFR is housed in a compact 9×9 mm DFN-32 package with exposed thermal pad (EP), optimized for high-density industrial PCB layouts and thermal dissipation under sustained 700 mA loads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI83404AAA-IF and SI83408AFA-IF, SI8340XEN1-IFR provides core 4-channel high-side switching and diagnostics but excludes inrush mode and dedicated open-channel/VDD2 warning pins-making it optimal for cost-sensitive, non-lamp industrial loads where those features are unnecessary.

Availability

SI8340XEN1-IFR is available at Aetrix Electronics and suitable for programmable logic controllers, industrial motion controllers, and smart solid-state relays requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for SI8340XEN1-IFR 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

Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions for infrastructure, automotive, and industrial markets.

The Si834x product line was engineered specifically for industrial programmable controllers and distributed I/O systems, replacing optocoupler-based relay drivers with integrated, isolated, intelligent switching and diagnostics.

FAQ

What is the isolation rating and safety certification status of the SI8340XEN1-IFR?

The SI8340XEN1-IFR provides 1.5 kV_RMS galvanic isolation rated per UL 1577 (pending final certification), CSA 62368-1, and CQC GB4943.1. Its CMOS-based RF isolation achieves >100 kV/µs common-mode transient immunity-exceeding optocoupler performance-and is designed for functional safety in industrial PLC backplanes where creepage/clearance and transient robustness are critical. SI8340XEN1-IFR meets IEC 61131-2 for programmable controller interfaces.

Does the SI8340XEN1-IFR support both parallel and SPI interfaces simultaneously?

Yes, the SI8340XEN1-IFR supports concurrent parallel and SPI operation: A1–A4 and OE pins provide deterministic real-time switching, while MOSI/MISO/SCLK/NSS enable full diagnostic access-including reading eight fault types, clearing latched faults, and monitoring VDD2 status-without interfering with switch control timing. This dual-path architecture ensures no compromise between speed and visibility in demanding industrial applications. SI8340XEN1-IFR maintains independent isolation channels for each interface domain.

What protection features does the SI8340XEN1-IFR include for inductive loads?

The SI8340XEN1-IFR integrates a unique multi-voltage "smart output clamp" that safely absorbs unlimited demagnetization energy (EAS) from inductive loads like solenoids and relays, eliminating external flyback diodes. It also provides overcurrent protection with inrush mode (not enabled on SI8340XEN1-IFR), overtemperature shutdown, VDD2 undervoltage lockout, and open-circuit detection-all reported via SPI or dedicated pins (FLT, VDD2_WRN, LEDn). These protections prevent damage during switching transients and fault conditions.

How does the SI8340XEN1-IFR handle fault reporting and clearing?

The SI8340XEN1-IFR reports up to eight distinct diagnostics-including overcurrent, overtemperature, open-circuit, VDD2 warning, and communication errors-via SPI status registers. The active-low FLT pin asserts when any fault is latched and remains asserted until the fault condition clears and the Clear Fault Delay (tCFD) expires. Faults can be cleared via SPI command or automatically upon resolution; no external reset is required. SI8340XEN1-IFR ensures diagnostic communication is independent of switch control signals using dedicated isolation channels with constant error checking.

What is the operating temperature range and thermal performance of the SI8340XEN1-IFR?

The SI8340XEN1-IFR operates from –40 °C to +125 °C ambient, with internal thermal protection that constrains or shuts down channels upon overtemperature detection. Its 9×9 mm DFN-32 package includes an exposed thermal pad (EP) for efficient heat transfer to the PCB, enabling sustained 700 mA per channel operation under industrial convection cooling. R_ON of 155 mΩ minimizes power dissipation (0.7² × 0.155 ≈ 76 mW/channel), supporting high-density layout without forced airflow. SI8340XEN1-IFR is qualified for extended life in harsh environments.