Skyworks Solutions Inc. SI86S631BE-IS2

Overview

SI86S631BE-IS2 from Skyworks Solutions is a 3-channel, reinforced digital isolator with 6000 VRMS isolation rating, 150 Mbps data rate, and dual 2.25–5.5 V supply operation. It features tri-state outputs with enable, selectable fail-safe default (high/low), and operates across –40 to 125 °C for industrial motor control and isolated ADC interfaces.

For engineers reviewing the SI86S631BE-IS2 datasheet, SI86S631BE-IS2 pinout, SI86S631BE-IS2 application, or SI86S631BE-IS2 equivalent, key selection criteria include reinforced IEC 60747-17 certification, 10 ns typical propagation delay, 3.5 ns pulse width distortion, transient immunity ≥100 kV/µs, and WB SOIC-16 package compatibility with 8 mm creepage.

Technical Context

The SI86S631BE-IS2 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and providing superior CMTI over optocouplers. Its architecture supports independent UVLO and reset per side (VDD1/VDD2), with 100 kΩ weak pulldown during unpowered states and configurable fail-safe output polarity.

It integrates Schmitt-trigger + CMOS threshold inputs for noise immunity, tri-state output control via EN1/EN2, and operates without external components beyond mandatory 0.1 µF + 10 µF bypass capacitors per supply rail. The device is AEC-Q100 qualified and certified to UL 1577, CSA 62368-1/60601-1, VDE 60747-17, and CQC GB4943.1.

Key Specifications

Pinout & Package

SI86S631BE-IS2 is housed in a wide-body SOIC-16 (WB SOIC-16) package with 8.0 mm creepage and clearance, supporting 6000 VRMS isolation. Pinout follows Figure 1 of the datasheet for Si86S63x devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM131D0BRZ and ISO6731FDWR, SI86S631BE-IS2 delivers higher isolation (6000 VRMS), faster data rate (150 Mbps), automotive qualification (AEC-Q100), and configurable fail-safe behavior-making it optimal for next-generation EV power electronics and industrial automation requiring reinforced safety and timing precision.

Availability

SI86S631BE-IS2 is available at Aetrix Electronics and suitable for industrial motor control, onboard chargers, and battery management systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI86S631BE-IS2 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 analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-reliability applications.

The Si86S6xx family is engineered for high-speed, reinforced digital isolation in demanding automotive and industrial systems-delivering best-in-class CMTI, low propagation delay, and safety certifications without startup overhead.

FAQ

What is the isolation rating and safety certification status of SI86S631BE-IS2?

SI86S631BE-IS2 provides 6000 VRMS isolation for 1 minute per UL 1577 and is certified to VDE 60747-17 (reinforced), CSA 62368-1/60601-1, and CQC GB4943.1. These approvals are documented in Skyworks' official safety reports and validate its use in reinforced insulation systems for industrial and automotive applications. SI86S631BE-IS2 meets the requirements for end-equipment standards including IEC 61000-4-5 and IEC 61800-5-1.

Does SI86S631BE-IS2 require external components for basic operation?

Yes, SI86S631BE-IS2 requires two bypass capacitors per supply side: a 0.1 µF ceramic capacitor and a 10 µF bulk capacitor placed as close as possible to VDD1/GND1 and VDD2/GND2. No pull-up/down resistors, level shifters, or initialization firmware are needed. The device powers up with valid outputs within 0.3 ms after VDD exceeds UVLO+, eliminating boot dependencies.

How does the fail-safe mode work on SI86S631BE-IS2, and how is it configured?

SI86S631BE-IS2 offers factory-configured fail-safe behavior: when VDD1 is unpowered but VDD2 remains active, outputs B1–B3 default to either logic high or logic low based on the ordering option suffix (e.g., "B" = default low, "E" = default high). This setting is fixed at manufacture and cannot be changed in-circuit. The SI86S631BE-IS2 variant uses "E", meaning outputs go high during VDD1 brownout while VDD2 is maintained.

What is the maximum data rate supported by SI86S631BE-IS2, and what timing parameters enable high-speed operation?

SI86S631BE-IS2 supports up to 150 Mbps data rate with 10 ns typical propagation delay and 3.5 ns typical pulse width distortion. Its RF-based modulation scheme, combined with Schmitt-trigger inputs and 50 Ω nominal output impedance, enables clean signal edges and minimal jitter-critical for SPI clock domains, encoder interfaces, and real-time control loops. These values are guaranteed across –40 to 125 °C and 2.25–5.5 V supply range.

Is SI86S631BE-IS2 qualified for automotive applications, and what evidence supports this?

Yes, SI86S631BE-IS2 is AEC-Q100 qualified (Grade 1, –40 to 125 °C) and built using automotive-specific manufacturing flows with AIAG-compliant PPAP documentation. It also supports IMDS/CAMDS reporting and is approved for use in onboard chargers, traction inverters, and battery management systems. The "-IS2" suffix denotes the wide-body SOIC-16 package with 6000 VRMS rating required for automotive reinforced insulation.