Skyworks Solutions Inc. SI86S641EB-IU

Overview

SI86S641EB-IU 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 per UL 1577. Designed for isolated SPI interfaces in battery management systems and motor control inverters, it operates from 2.25–5.5 V on both sides with fail-safe default-low output configuration.

For engineers reviewing the SI86S641EB-IU datasheet, SI86S641EB-IU pinout, SI86S641EB-IU application, or SI86S641EB-IU equivalent, key selection criteria include its 4-channel forward/reverse I/O architecture, AEC-Q100 qualification, IEC 60747-17 reinforced insulation rating, and compatibility with isolated SPI peripheral interfacing under –40 to 125 °C ambient conditions.

Technical Context

The SI86S641EB-IU implements RF-based on/off keying modulation across a monolithic semiconductor isolation barrier, eliminating startup initialization and enabling deterministic timing behavior. Its dual-supply architecture (VDD1/VDD2) supports independent 2.25–5.5 V operation on each side, with undervoltage lockout (UVLO) thresholds at 2.10–2.25 V (rising) and 1.98–2.12 V (falling).

It features Schmitt-trigger + CMOS threshold inputs for noise immunity, tri-state outputs controlled by EN1/EN2 pins, and a fail-safe mode that holds outputs low when Side A is unpowered and Side B remains powered. Input deglitch filtering with 36 ns pulse rejection is implemented per channel.

Key Specifications

Pinout & Package

SI86S641EB-IU is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance), supporting 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 ADUM140D0BRWZ and ISO6741FDWR, SI86S641EB-IU uniquely combines 150 Mbps speed, 6000 VRMS isolation, AEC-Q100 Grade 0 qualification, and –40 to 125 °C operation-making it the only option qualified for high-reliability automotive traction and industrial HV systems requiring full reinforced insulation compliance.

Availability

SI86S641EB-IU is available at Aetrix Electronics and suitable for battery management systems, motor control inverters, and medical imaging power supplies requiring stable component supply across extended product lifecycles.

Supply support for SI86S641EB-IU 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 solutions for demanding wireless, automotive, and industrial applications.

The Si86S6xx family was engineered to replace optocouplers in safety-critical systems, delivering superior speed, reliability, and regulatory compliance for isolated digital interfaces in EV powertrains and industrial automation.

FAQ

What is the isolation voltage rating of the SI86S641EB-IU and which safety standards does it meet?

The SI86S641EB-IU provides 6000 VRMS isolation for 1 minute per UL 1577 and is certified to IEC 60747-17 (reinforced insulation), CSA 62368-1/60601-1, and CQC GB4943.1. These approvals validate its suitability for high-voltage industrial and automotive applications where reinforced insulation is mandated, including onboard chargers and medical power supplies.

Does the SI86S641EB-IU require external components for basic operation?

Yes, the SI86S641EB-IU requires 0.1 µF and 10 µF bypass capacitors on both VDD1–GND1 and VDD2–GND2 pairs, placed as close as possible to the pins. No pull-up/down resistors are needed for normal operation, though 50–300 Ω series resistors may be added to inputs/outputs in extremely noisy environments per datasheet recommendation.

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

The SI86S641EB-IU is ordered with default-low fail-safe mode (denoted by "E" in the part number). When VDD1 is unpowered but VDD2 remains active, all B1–B4 outputs are held low. This behavior is confirmed in Table 4 of the datasheet and ensures safe shutdown of downstream peripherals during controller-side power loss.

Can the SI86S641EB-IU be used in SPI isolation applications?

Yes, the SI86S641EB-IU supports isolated SPI communication via its four bidirectional channels. While not a dedicated SPI isolator like the Si86SS41, it can isolate MOSI, MISO, SCLK, and CS signals with matched propagation delay (<10 ns typical) and channel-to-channel skew <1 ns-enabling reliable full-duplex SPI operation up to 150 Mbps.

What is the meaning of the "B-IU" suffix in SI86S641EB-IU?

The "B" indicates the device belongs to the Si86S64xB subfamily with input deglitch filtering (36 ns), and "IU" specifies the WB SOIC-16 package (10.3 mm creepage) with industrial temperature grade (–40 to 125 °C). The "E" denotes default-low fail-safe output configuration, and "1" identifies the 4-channel variant with A1–A4/B1–B4 I/O mapping.