Skyworks Solutions Inc. SI86S642FC-IS1

Overview

SI86S642FC-IS1 from Skyworks Solutions is a 4-channel reinforced digital isolator with bidirectional signal isolation across an integrated 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 supplies on both sides and is qualified per AEC-Q100 for automotive battery management and traction inverter systems.

For engineers reviewing the SI86S642FC-IS1 datasheet, SI86S642FC-IS1 pinout, SI86S642FC-IS1 application, or SI86S642FC-IS1 equivalent, this device delivers precise timing, fail-safe output configuration (default-low), Schmitt-trigger inputs with CMOS thresholds, and transient immunity of ≥100 kV/µs - critical for high-noise motor control and isolated ADC interfaces.

Technical Context

The SI86S642FC-IS1 implements RF-based on/off keying modulation across its isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture supports independent undervoltage lockout (UVLO) and reset monitoring on both sides (VDD1/VDD2), with RSTB thresholds at ~1.7 V and UVLO hysteresis of 105–160 mV.

This variant features four isolated I/O channels (A1–A4/B1–B4), dual enable inputs (EN1/EN2), and no sleep mode (SMb not implemented). Pinout matches Si86S64x family in narrow-body SOIC-16 package, with side-A and side-B power/ground pairs separated by the isolation barrier.

Key Specifications

Pinout & Package

Narrow-body SOIC-16 (NB SOIC-16) package with creepage/clearance compliant to reinforced insulation standards; 16-pin layout with side-A (pins 1–8) and side-B (pins 9–16) physically segregated by internal isolation barrier.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM2402BRWZ and ISO7741FDWR, SI86S642FC-IS1 uniquely combines 150 Mbps speed, 6000 VRMS reinforced isolation, AEC-Q100 Grade 1, and factory-configured default-low fail-safe - making it optimal for next-generation EV traction inverters and high-density industrial SMPS.

Availability

SI86S642FC-IS1 is available at Aetrix Electronics and suitable for automotive battery management systems, industrial motor drives, and isolated switch-mode power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI86S642FC-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 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 was designed specifically for automotive and industrial systems demanding reinforced isolation, high CMTI, and AEC-Q100 compliance - targeting battery management, traction inverters, and isolated power conversion.

FAQ

What is the isolation voltage rating of the SI86S642FC-IS1?

The SI86S642FC-IS1 provides 6000 VRMS isolation for 1 minute per UL 1577, certified to reinforced insulation standards including VDE 60747-17 and IEC 62368-1. This rating applies to the NB SOIC-16 package and is validated across the full operating temperature range of –40 to +125 °C. The SI86S642FC-IS1 achieves this without external components or layout modifications.

Does the SI86S642FC-IS1 support fail-safe output configuration?

Yes, the SI86S642FC-IS1 is factory-configured for default-low fail-safe operation. When VDD1 drops below UVLO– (1.98–2.12 V), outputs B1–B4 transition to logic low within 0.3 ms and remain low until VDD1 rises above UVLO+ (2.10–2.25 V). This behavior is intrinsic to the SI86S642FC-IS1 ordering option and requires no external circuitry.

What are the supply voltage requirements for SI86S642FC-IS1 operation?

The SI86S642FC-IS1 operates with independent 2.25–5.5 V supplies on both sides: VDD1 powers side-A inputs (A1–A4, EN1), and VDD2 powers side-B outputs (B1–B4, EN2). Each supply must be bypassed with 0.1 µF ceramic + 10 µF bulk capacitors placed adjacent to the respective VDD/GND pins. Operation outside this range risks undefined output states or latch-up.

How does the SI86S642FC-IS1 handle noise immunity in high-dv/dt environments?

The SI86S642FC-IS1 achieves ≥100 kV/µs common-mode transient immunity (CMTI) via RF-based modulation and integrated Schmitt-trigger inputs with 36 ns deglitch filtering. Its semiconductor isolation barrier rejects magnetic coupling better than optocouplers, and the 0.15 × VDD input hysteresis prevents false triggering from fast-edge noise in motor drive and inverter applications.

Is the SI86S642FC-IS1 pin-compatible with other Si86S6xx variants?

Yes, the SI86S642FC-IS1 shares identical pinout and package (NB SOIC-16) with all Si86S64x devices, including SI86S640 and SI86S641. Differences are limited to internal configuration: SI86S642FC-IS1 has default-low fail-safe, while SI86S641FC-IS1 offers default-high. No PCB redesign is needed when substituting within the Si86S64x family.