Skyworks Solutions Inc. SI86S641BC-IS1

Overview

SI86S641BC-IS1 from Skyworks Solutions is a 4-channel, reinforced digital isolator with bidirectional signal isolation across an integrated semiconductor barrier. It supports up to 150 Mbps data rate, features 10 ns typical propagation delay, 3.5 ns pulse width distortion, and operates from 2.25 V to 5.5 V on both sides. Designed for isolated SPI interfaces in battery management systems and motor control inverters, it delivers fail-safe default-low output behavior and 6000 VRMS isolation rating.

For engineers reviewing the SI86S641BC-IS1 datasheet, SI86S641BC-IS1 pinout, SI86S641BC-IS1 application, or SI86S641BC-IS1 equivalent, key selection criteria include its 4-channel forward/reverse configuration, AEC-Q100 qualification, IEC 60747-17 reinforced insulation, and compatibility with isolated SPI peripheral communication in automotive and industrial power systems.

Technical Context

The SI86S641BC-IS1 implements RF-based on/off keying modulation across a monolithic silicon isolation barrier, eliminating startup initialization and enabling deterministic timing without clock recovery circuits. Its architecture supports independent supply domains (VDD1/VDD2), dual undervoltage lockout (UVLO) monitors, and side-specific reset thresholds (RSTB± ~1.7 V).

It integrates Schmitt-trigger + CMOS-threshold inputs for noise immunity, tri-state outputs controlled by EN1/EN2 pins, and selectable fail-safe mode (default low per -BC suffix). The device includes input deglitch filtering (36 ns) and achieves 100 kV/µs transient immunity, meeting reinforced insulation requirements per UL 1577, VDE 60747-17, and CSA 62368-1.

Key Specifications

Pinout & Package

SI86S641BC-IS1 is housed in a narrow-body SOIC-16 package (NB SOIC-16), with creepage/clearance optimized for reinforced insulation at 6000 VRMS. 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 ADUM4401BRWZ and ISO6741QDWR, SI86S641BC-IS1 uniquely combines AEC-Q100 Grade 1, 6000 VRMS reinforced isolation, 150 Mbps speed, and programmable default-low fail-safe mode-making it the only option qualified for high-speed, safety-critical automotive power conversion where deterministic shutdown behavior is mandatory.

Availability

SI86S641BC-IS1 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and onboard chargers requiring stable component supply across automotive production lifecycles.

Supply support for SI86S641BC-IS1 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 leader in high-performance analog semiconductors, specializing in RF, timing, and isolation technologies for wireless, automotive, and industrial markets.

The Si86S6xx family was engineered specifically for high-reliability, high-speed digital isolation in automotive electrification and industrial power systems-emphasizing AEC-Q100 compliance, reinforced safety certification, and RF-based timing stability.

FAQ

What is the isolation voltage rating of SI86S641BC-IS1?

The SI86S641BC-IS1 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 NB SOIC-16 package and enables use in high-voltage automotive and industrial systems where creepage and clearance must meet stringent safety standards. SI86S641BC-IS1 maintains this rating across its full operating temperature range.

Does SI86S641BC-IS1 support SPI isolation?

Yes, SI86S641BC-IS1 supports isolated SPI communication through its four bidirectional channels. It is commonly deployed to isolate CS, CLK, MOSI, and MISO lines between microcontrollers and isolated peripherals such as ADCs or gate drivers. While not a dedicated SPI isolator like the Si86SSx series, SI86S641BC-IS1 provides the channel count, timing precision (10 ns propagation delay), and noise immunity required for robust SPI isolation in BMS and motor control.

What does the "BC" suffix indicate in SI86S641BC-IS1?

The "BC" suffix in SI86S641BC-IS1 denotes the fail-safe output configuration: default-low behavior when the input-side supply (VDD1) is unpowered but the output-side supply (VDD2) remains active. This ensures that control signals revert to a safe inactive state during brownout conditions-a critical requirement in automotive power systems. SI86S641BC-IS1 implements this behavior via internal circuitry tied to the UVLO and reset thresholds.

Is SI86S641BC-IS1 AEC-Q100 qualified?

Yes, SI86S641BC-IS1 is AEC-Q100 qualified Grade 1 (–40 °C to +125 °C), with full test documentation including HTOL, TC, and ESD validation. This qualification covers the entire device-including isolation barrier, logic circuitry, and package-and confirms suitability for automotive powertrain applications such as onboard chargers, battery management systems, and traction inverters.

What are the supply voltage requirements for SI86S641BC-IS1?

SI86S641BC-IS1 operates with independent 2.25 V to 5.5 V supplies on both sides (VDD1 and VDD2), allowing mixed-voltage interfacing-for example, 3.3 V MCU side and 5 V ADC side. Each supply requires local 0.1 µF ceramic + 10 µF bulk bypass capacitors. Undervoltage lockout triggers at ~2.1 V (rising) and ~2.05 V (falling), ensuring reliable startup and shutdown sequencing.