Skyworks Solutions Inc. SI86S640HC-IS1R

Overview

SI86S640HC-IS1R from Skyworks Solutions is a 4-channel reinforced digital isolator with bidirectional signal isolation across a 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 on both sides and features Schmitt-trigger inputs, tri-state outputs with enable, and fail-safe default-high output mode - used in isolated ADC interfaces and motor control gate drivers.

For engineers reviewing the SI86S640HC-IS1R datasheet, SI86S640HC-IS1R pinout, SI86S640HC-IS1R application, or SI86S640HC-IS1R equivalent, key selection criteria include reinforced IEC 60747-17 certification, AEC-Q100 qualification for automotive use, 36 ns input deglitch filtering, and compatibility with industrial automation and battery management systems requiring high CMTI and low power consumption.

Technical Context

The SI86S640HC-IS1R implements RF-based on/off keying modulation across a monolithic silicon isolation barrier, eliminating startup initialization and enabling deterministic timing behavior. Its architecture supports independent undervoltage lockout (UVLO) and reset circuits per side (VDD1/VDD2), with RSTB thresholds at ~1.7 V and UVLO hysteresis of 105–160 mV.

It integrates four isolated bidirectional channels with CMOS/Schmitt-trigger inputs, tri-state output control via EN1/EN2 pins, and selectable fail-safe output state (default-high per "H" suffix). The device includes 36 ns input noise filters to suppress sub-threshold glitches, and supports sleep mode via external control when enabled in compatible variants - though SI86S640HC-IS1R itself does not include SMb pin functionality.

Key Specifications

Pinout & Package

SI86S640HC-IS1R is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance), optimized for 6000 VRMS reinforced 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 ADUM4402ARWZ and ISO6741FDWR, SI86S640HC-IS1R delivers higher data throughput, tighter timing, built-in noise filtering, and full automotive-grade reinforcement - making it optimal for next-generation EV powertrain and industrial servo systems demanding reliability under harsh EMI conditions.

Availability

SI86S640HC-IS1R is available at Aetrix Electronics and suitable for industrial automation systems, battery management systems, and motor control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI86S640HC-IS1R 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 isolation in automotive traction inverters, industrial motor drives, and medical equipment - emphasizing reinforced safety, low-latency timing, and electromagnetic robustness.

FAQ

What is the isolation voltage rating of the SI86S640HC-IS1R?

The SI86S640HC-IS1R is rated for 6000 VRMS isolation per UL 1577 for 1 minute, with reinforced insulation certification per IEC 60747-17. This rating applies to the WB SOIC-16 package and enables use in high-voltage systems such as EV battery packs and industrial switch-mode power supplies where creepage and clearance compliance is mandatory. SI86S640HC-IS1R achieves this through its proprietary silicon dioxide isolation barrier and wide-body packaging.

Does the SI86S640HC-IS1R support fail-safe output behavior?

Yes, the SI86S640HC-IS1R implements selectable fail-safe operation, and the "H" in its part number indicates default-high output state when the input-side supply (VDD1) is unpowered but the output-side supply (VDD2) remains active. This behavior is confirmed in Table 4 of the datasheet and ensures predictable logic states during brown-out or controller reset events - critical for safe shutdown in motor control and BMS applications using SI86S640HC-IS1R.

What is the purpose of the 36 ns input deglitch filter in the SI86S640HC-IS1R?

The 36 ns hardware deglitch filter in the SI86S640HC-IS1R rejects transient noise pulses shorter than 36 ns on input channels A1–A4 and B1–B4, preventing false output transitions caused by EFT, ESD coupling, or switching noise. This feature is standard in the Si86S64x series and directly improves system reliability in industrial environments - unlike software-based filtering, it imposes no latency penalty and operates independently of MCU firmware, making it integral to SI86S640HC-IS1R's robustness.

Can the SI86S640HC-IS1R be used in automotive applications?

Yes, the SI86S640HC-IS1R is AEC-Q100 Grade 1 qualified (–40 °C to +125 °C), with AIAG-compliant PPAP documentation and IMDS/CAMDS support. It meets reinforced insulation requirements per IEC 60747-17 and is approved for use in onboard chargers, battery management systems, and traction inverters. Its 6000 VRMS rating, 100 kV/µs CMTI, and fail-safe default-high mode make SI86S640HC-IS1R suitable for ASIL-B–compliant subsystems in battery electric vehicles.

What are the supply bypass requirements for the SI86S640HC-IS1R?

The SI86S640HC-IS1R 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 configuration suppresses high-frequency switching noise and stabilizes rail voltage during fast output transitions. Failure to implement proper bypassing may degrade timing performance and increase susceptibility to EMI - a requirement explicitly stated in Section 3.2.1 of the SI86S640HC-IS1R datasheet.