Skyworks Solutions Inc. SI86S640BB-IUR

Overview

SI86S640BB-IUR from Skyworks Solutions is a 4-channel, reinforced digital isolator with bidirectional signal isolation across a 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 onboard chargers and battery management systems.

For engineers reviewing the SI86S640BB-IUR datasheet, SI86S640BB-IUR pinout, SI86S640BB-IUR application, or SI86S640BB-IUR equivalent, key selection criteria include its reinforced IEC 60747-17 rating, fail-safe default-high/low output option, Schmitt-trigger + CMOS input thresholds, tri-state outputs with enable, and 100 kV/µs CMTI performance - all critical for isolated motor control, power inverters, and medical electronics designs.

Technical Context

The SI86S640BB-IUR implements RF-based on/off keying modulation across a monolithic semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture integrates 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 features four isolated bidirectional channels (A1–A4/B1–B4), dual-side enable inputs (EN1/EN2), and supports selectable fail-safe output states during unpowered conditions. Input deglitch filtering (36 ns) is included, and output impedance is nominally 50 Ω ±40%, requiring controlled-impedance PCB routing for high-speed signals.

Key Specifications

Pinout & Package

SI86S640BB-IUR is housed in a wide-body SOIC-16 (WB SOIC-16) package with creepage/clearance optimized for 6000 VRMS reinforced isolation. Pin 1 is marked with a dot; the isolation barrier separates 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 ADUM2402ARWZ and ISO6741FDWR, SI86S640BB-IUR delivers 6× higher data rate, 20% higher isolation voltage, and built-in 36 ns deglitching - making it uniquely suited for automotive traction inverters and high-fidelity isolated data acquisition where timing fidelity and noise resilience are non-negotiable.

Availability

SI86S640BB-IUR is available at Aetrix Electronics and suitable for automotive onboard chargers, industrial motor drives, and medical patient monitoring systems requiring stable component supply with long-term lifecycle assurance.

Supply support for SI86S640BB-IUR 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 engineered specifically for high-reliability, high-speed digital isolation in automotive and industrial safety-critical systems - emphasizing reinforced insulation, AEC-Q100 compliance, and RF-based noise immunity.

FAQ

What is the isolation voltage rating of SI86S640BB-IUR and which safety standards does it meet?

SI86S640BB-IUR is rated for 6000 VRMS isolation for 1 minute per UL 1577 and carries reinforced insulation certification per IEC 60747-17, CSA 62368-1/60601-1, and CQC GB4943.1. This enables use in two-MOPP medical systems and high-voltage automotive inverters where creepage and working voltage margins are critical. The rating applies specifically to the WB SOIC-16 package variant.

Does SI86S640BB-IUR support fail-safe output configuration, and how is it selected?

Yes, SI86S640BB-IUR offers a selectable fail-safe mode (default high or default low) determined by ordering option - not user-configurable in-circuit. The "BB" suffix indicates the default-low variant. During VDD1 unpowering while VDD2 remains active, outputs B1–B4 hold low. This behavior is defined in Table 4 of the datasheet and ensures deterministic state in power-loss scenarios.

What is the purpose of the EN1 and EN2 pins on SI86S640BB-IUR?

EN1 and EN2 are active-high enable inputs that place all outputs on their respective sides (Side A or Side B) into high-impedance state when driven low. This allows dynamic bus sharing, reduces standby power, and supports hot-plug architectures. Both pins require external pull-up resistors (10 kΩ recommended) and are fully compatible with 3.3 V and 5 V logic levels.

Can SI86S640BB-IUR be used in SPI isolation applications, and what are its limitations?

SI86S640BB-IUR can isolate standard SPI signals (e.g., SCLK, MOSI, MISO, CS) using two or more channels, but it lacks dedicated SPI protocol logic like direction control or automatic chip select forwarding. For full SPI isolation with integrated protocol handling, Skyworks recommends the Si86SS41/51 family. SI86S640BB-IUR is best applied to point-to-point isolated data links within SPI subsystems.

What packaging and footprint does SI86S640BB-IUR use, and are there layout constraints?

SI86S640BB-IUR uses a WB SOIC-16 package (5.3 mm body width, 10.3 mm length) with 1.27 mm pitch. Critical layout constraints include maintaining ≥8.3 mm creepage/clearance across the isolation barrier, placing 0.1 µF + 10 µF bypass capacitors within 3 mm of each VDD/GND pair, and routing A/B channel traces differentially with controlled 50 Ω impedance to minimize reflections at 150 Mbps.