Skyworks Solutions Inc. SI86S641EB-AU

Overview

SI86S641EB-AU from Skyworks Solutions is a 4-channel, reinforced digital isolator with bidirectional signal isolation across an integrated semiconductor barrier. It supports DC to 150 Mbps data rates, delivers 10 ns typical propagation delay, and provides 6000 VRMS isolation rating in a WB SOIC-16 package. It operates from 2.25–5.5 V supplies and is qualified to AEC-Q100 for automotive battery management and traction inverter interfaces.

For engineers reviewing the SI86S641EB-AU datasheet, SI86S641EB-AU pinout, SI86S641EB-AU application, or SI86S641EB-AU equivalent, this page delivers verified electrical specs, fail-safe mode behavior, IEC 60747-17 compliance details, and validated alternative options for industrial and automotive isolated communication designs.

Technical Context

The SI86S641EB-AU implements RF-based on/off keying modulation across its isolation barrier-eliminating startup initialization and enabling robust noise immunity up to 100 kV/µs. Its architecture includes Schmitt-trigger inputs with CMOS thresholds and tri-state outputs controlled by side-specific enable pins (EN1/EN2).

It supports selectable fail-safe output states (default high or low) during unpowered input-side conditions, and features precise timing with ≤3.5 ns pulse width distortion. The device meets reinforced insulation requirements per UL 1577, VDE 60747-17, CSA 62368-1, and CQC GB4943.1.

Key Specifications

Pinout & Package

SI86S641EB-AU is housed in a wide-body SOIC-16 (WB SOIC-16) package with creepage/clearance optimized for 6000 VRMS isolation. Pin assignments follow the Si86S64x family layout shown in Figure 2 of the datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM4401BRIZ and ISO6741FDWR, SI86S641EB-AU delivers higher speed, stronger isolation, and tighter timing-making it optimal for next-generation EV inverters and high-density industrial servo drives where performance and safety coexist.

Availability

SI86S641EB-AU is available at Aetrix Electronics and suitable for automotive battery management systems, industrial motor drives, and isolated power supply designs requiring stable component supply, long lifecycle support, and traceable sourcing.

Supply support for SI86S641EB-AU 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.

The Si86S6xx family was designed specifically for high-reliability, high-speed signal isolation in automotive and industrial systems-emphasizing reinforced safety, low-latency timing, and robustness in noisy EMI environments.

FAQ

What is the isolation voltage rating of SI86S641EB-AU?

The SI86S641EB-AU is rated for 6000 VRMS isolation for 1 minute per UL 1577, with reinforced insulation certification per VDE 60747-17 and CSA 62368-1. This rating applies to the WB SOIC-16 package and supports working voltages up to 1000 VAC in end equipment meeting IEC 61010-1 or IEC 62368-1 requirements. SI86S641EB-AU achieves this via its proprietary silicon-based isolation barrier.

Does SI86S641EB-AU require external configuration or initialization at power-up?

No. SI86S641EB-AU uses an RF-modulated architecture that requires no firmware, register writes, or startup sequence. Outputs begin tracking inputs within 0.3 ms after VDD exceeds the UVLO threshold (2.18 V typical), with no clock or handshake needed. SI86S641EB-AU enters normal operation autonomously-ideal for fail-safe control systems.

How does the fail-safe mode function on SI86S641EB-AU?

SI86S641EB-AU offers factory-selectable fail-safe behavior: when VDD1 is unpowered but VDD2 remains active, B-side outputs default to either logic high or logic low based on the ordering option suffix ('E' = default low, 'B' = default high). This behavior is defined in Table 4 of the datasheet and ensures predictable state during partial power loss. SI86S641EB-AU implements this using internal reset detection circuitry tied to RSTB thresholds (~1.7 V).

Can SI86S641EB-AU be used in SPI isolation applications?

Yes-SI86S641EB-AU supports SPI isolation through discrete channel mapping: A1–A4 and B1–B4 can route SCLK, MOSI, MISO, and CS signals across the barrier. While not a dedicated SPI isolator like Si86SS41, SI86S641EB-AU's 150 Mbps bandwidth, low skew, and tri-state enables robust implementation of isolated SPI buses in motor drives and BMS. SI86S641EB-AU requires external direction control logic for full-duplex operation.

What are the supply bypass requirements for SI86S641EB-AU?

SI86S641EB-AU requires two bypass capacitors per supply domain: a 0.1 µF ceramic capacitor and a 10 µF bulk capacitor placed as close as possible between VDD1–GND1 and VDD2–GND2. This dual-capacitor network suppresses high-frequency noise and sustains transient current demands during switching events. SI86S641EB-AU's internal regulator and RF transmitter rely on clean local supplies to maintain 100 kV/µs CMTI and jitter-free timing.