Skyworks Solutions Inc. SI86S642EB-AUR

Overview

SI86S642EB-AUR from Skyworks Solutions is a 4-channel reinforced digital isolator with bidirectional signal isolation across a semiconductor barrier, supporting up to 150 Mbps data rate, 10 ns typical propagation delay, and 6000 VRMS isolation rating. It operates from 2.25–5.5 V on both sides and features Schmitt-trigger + CMOS inputs, tri-state outputs with enable, and selectable fail-safe default output (low) for industrial motor control and battery management systems.

For engineers reviewing the SI86S642EB-AUR datasheet, SI86S642EB-AUR pinout, SI86S642EB-AUR application, or SI86S642EB-AUR equivalent, key selection criteria include reinforced IEC 60747-17 certification, AEC-Q100 qualification, 36 ns input deglitch filtering, sleep mode support via SMb pin, and compatibility with isolated ADC/DAC interfaces in high-noise automotive and industrial environments.

Technical Context

The SI86S642EB-AUR implements RF-based on/off keying modulation across a monolithic semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity (100 kV/µs CMTI). Its architecture supports independent undervoltage lockout (UVLO) and reset circuitry per side (VDD1/VDD2), with RSTB thresholds at ~1.7 V and UVLO hysteresis of 105–160 mV.

It integrates four isolated channels with configurable directionality via external control pins, includes 36 ns input deglitch filters to suppress sub-pulse noise, and provides tri-state output control through EN1/EN2 pins-enabling precise timing synchronization in isolated SPI and QSPI data paths without signal contention.

Key Specifications

Pinout & Package

SI86S642EB-AUR uses a WB SOIC-16 (wide-body SOIC-16) package with creepage/clearance optimized for 6000 VRMS working voltage. Pin numbering follows standard SOIC-16 layout with isolation barrier between Side A (pins 1–8) and Side B (pins 9–16).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital isolator applications.

Compared with ADUM4402BRIZ and ISO6742FDWR, SI86S642EB-AUR delivers higher data rate (150 Mbps vs. ≤100 Mbps), certified 6000 VRMS isolation, integrated 36 ns deglitching, and AEC-Q100 qualification-making it uniquely suited for next-generation EV traction inverters and high-fidelity isolated sensor interfaces.

Availability

SI86S642EB-AUR is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management systems, and isolated ADC interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical designs.

Supply support for SI86S642EB-AUR 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, with leadership in RF, timing, and isolation technologies for high-reliability applications.

The Si86S6xx family is designed for high-noise, safety-critical isolation in automotive traction systems and industrial automation-delivering RF-based performance, reinforced certification, and fail-safe behavior without optical degradation.

FAQ

What is the isolation voltage rating of SI86S642EB-AUR and which safety standards does it meet?

SI86S642EB-AUR is rated for 6000 VRMS isolation per UL 1577 for 1 minute and carries reinforced insulation certification per IEC 60747-17, CSA 62368-1/60601-1, and CQC GB4943.1. These approvals validate its use in medical, industrial, and automotive systems where double insulation is mandated, and confirm its suitability for onboard chargers and battery management units requiring functional safety compliance.

Does SI86S642EB-AUR support fail-safe operation, and how is it configured?

Yes, SI86S642EB-AUR is factory-configured for default-low fail-safe output during VDD1 loss while VDD2 remains powered. This behavior is fixed per ordering option (the "E" in SI86S642EB-AUR denotes default-low), and does not require external configuration. It ensures predictable shutdown states in BMS monitoring circuits, eliminating risk of floating outputs during power faults.

What is the purpose of the SMb pin on SI86S642EB-AUR, and how does it affect power consumption?

The SMb (Sleep Mode) pin on SI86S642EB-AUR is an active-low control that reduces total device quiescent current to 750 µA per side when asserted. In sleep mode, all transmitter circuits disable except one channel dedicated to monitoring SMb state-allowing immediate wake-up when SMb is released. This feature is essential for portable diagnostic tools and always-on BMS subsystems where standby power must be minimized.

How does the 36 ns input deglitch filter in SI86S642EB-AUR improve system reliability?

The 36 ns input deglitch filter in SI86S642EB-AUR blocks noise pulses shorter than 36 ns-such as those induced by IGBT switching transients or EFT bursts-before they propagate across the isolation barrier. This prevents false triggering in downstream logic, maintains data integrity in isolated SPI clock/data lines, and eliminates need for external RC filtering, reducing BOM count and PCB area in motor control and power supply designs.

Is SI86S642EB-AUR compatible with 3.3 V and 5 V logic domains simultaneously?

Yes, SI86S642EB-AUR supports independent 2.25–5.5 V supplies on Side A (VDD1) and Side B (VDD2), enabling native interfacing with 3.3 V microcontrollers on one side and 5 V analog front-ends or gate drivers on the other. Its CMOS/Schmitt-trigger inputs accept logic thresholds scaled to respective VDD levels, and output drivers maintain VOH/VOL specs across the full voltage range-eliminating external level shifters.