Skyworks Solutions Inc. SI86S642EC-AS1R

Overview

SI86S642EC-AS1R 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, provides 6000 VRMS isolation rating, and operates from 2.25–5.5 V supplies across –40 to +125 °C - deployed in isolated ADC interfaces, motor control gate drivers, and battery management systems.

For engineers reviewing the SI86S642EC-AS1R datasheet, SI86S642EC-AS1R pinout, SI86S642EC-AS1R application, or SI86S642EC-AS1R equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade AEC-Q100 qualification, exact fail-safe mode behavior (default-low output), and real-world timing performance under industrial temperature and supply voltage stress.

Technical Context

The SI86S642EC-AS1R implements RF-based on/off keying modulation across a monolithic silicon isolation barrier, eliminating startup initialization and enabling deterministic operation without clock recovery or handshake protocols. Its architecture includes Schmitt-trigger inputs with 0.15×VDD hysteresis and CMOS-compatible outputs with 50 Ω nominal impedance.

It features dual independent enable pins (EN1, EN2), tri-state output control per side, and a fail-safe default-low output configuration activated during VDD1 unpowering while VDD2 remains active. The device meets IEC 60747-17 reinforced insulation requirements and achieves ≥100 kV/µs transient immunity.

Key Specifications

Pinout & Package

SI86S642EC-AS1R is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance) with 16-pin dual-row layout and reinforced insulation barrier separating 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 ISO6742FDWR, SI86S642EC-AS1R uniquely combines 150 Mbps speed, 6000 VRMS reinforced isolation, AEC-Q100 qualification, and factory-set default-low fail-safe behavior - making it optimal for next-generation EV inverters and high-fidelity isolated measurement systems.

Availability

SI86S642EC-AS1R is available at Aetrix Electronics and suitable for isolated motor control, automotive battery management, and medical data acquisition requiring stable component supply across extended product lifecycles.

Supply support for SI86S642EC-AS1R 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 high-performance analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.

The Si86S6xx family was engineered for high-reliability industrial and automotive isolation - delivering RF-based digital isolation with reinforced safety certification, ultra-low propagation delay, and fail-safe configurability for mission-critical power and sensing systems.

FAQ

What is the isolation voltage rating of SI86S642EC-AS1R and which safety standards does it meet?

SI86S642EC-AS1R is rated for 6000 VRMS isolation for 1 minute per UL 1577 and certified to IEC 60747-17 (reinforced insulation), CSA 62368-1, VDE 60747-17, and CQC GB4943.1. These approvals validate its use in systems requiring two means of protection (2×MOPP) such as medical equipment and high-voltage industrial drives. SI86S642EC-AS1R's wide-body SOIC-16 package provides 10.3 mm creepage and clearance to sustain this rating.

Does SI86S642EC-AS1R require external components for stable operation?

Yes - SI86S642EC-AS1R requires 0.1 µF ceramic and 10 µF bulk bypass capacitors on both VDD1–GND1 and VDD2–GND2 pairs, placed as close as possible to the respective pins. No pull-up/down resistors are needed on I/O pins due to built-in Schmitt triggers and CMOS thresholds, but series termination (50–300 Ω) is recommended on noisy lines driving controlled-impedance traces. SI86S642EC-AS1R has no internal oscillator or configuration memory - no external clock or programming is required.

How does the fail-safe mode function on SI86S642EC-AS1R?

SI86S642EC-AS1R is factory-configured for default-low fail-safe operation: when VDD1 drops below 2.25 V (unpowered) while VDD2 remains active, all B-side outputs (B1–B4) are driven low. This behavior is defined in Table 4 of the datasheet and avoids undefined states in safety-critical paths like gate driver disable or fault latch signals. SI86S642EC-AS1R does not support field-selectable fail-safe polarity - only the ordering option determines this behavior.

What is the maximum data rate supported by SI86S642EC-AS1R and how is timing performance affected by temperature?

SI86S642EC-AS1R supports DC to 150 Mbps data rates across its full operating temperature range of –40 to +125 °C. Propagation delay remains 10 ns typical with ±2 ns variation over temperature and voltage; pulse width distortion stays at 3.5 ns typical with <1 ns drift. These values are guaranteed in Table 10 (VDD = 5.0 V) and apply to all four channels simultaneously - no derating is required for multi-channel operation or thermal stress.

Is SI86S642EC-AS1R compatible with SPI or QSPI interfaces?

SI86S642EC-AS1R is a general-purpose 4-channel digital isolator and does not integrate SPI protocol logic or direction control like dedicated SPI isolators (e.g., Si86SS41). However, it can isolate individual SPI lines (SCLK, MOSI, MISO, CS) when paired with external direction control. For true QSPI isolation with bidirectional data lanes, Skyworks' Si86SQ44 is the designated solution - SI86S642EC-AS1R serves best for fixed-direction, high-speed point-to-point isolation such as PWM, encoder, or GPIO signals.