Skyworks Solutions Inc. SI86S640EC-AS1R

Overview

SI86S640EC-AS1R from Skyworks Solutions is a 4-channel reinforced digital isolator with 6000 VRMS isolation, 150 Mbps data rate, and AEC-Q100 qualification for automotive systems. It features Schmitt-trigger inputs, tri-state outputs with enable, selectable fail-safe default-high/low output, and operates across –40 to 125 °C in a WB SOIC-16 package. Used in battery management systems and traction inverters where high noise immunity and safety-certified signal isolation are critical.

For engineers reviewing the SI86S640EC-AS1R datasheet, SI86S640EC-AS1R pinout, SI86S640EC-AS1R application, or SI86S640EC-AS1R equivalent, key selection criteria include reinforced IEC 60747-17 rating, 10 ns propagation delay, 3.5 ns pulse width distortion, transient immunity ≥100 kV/µs, and compatibility with isolated ADC/DAC interfaces in high-voltage automotive subsystems.

Technical Context

The SI86S640EC-AS1R implements RF-based on/off keying modulation across a semiconductor isolation barrier-eliminating startup initialization and providing superior CMTI performance over optocouplers. Its dual-side undervoltage lockout (UVLO) and independent reset circuitry (RSTB– ~1.7 V) ensure deterministic behavior during power sequencing in 48 V–800 V automotive domains.

It supports bidirectional channel operation via side-specific enable pins (EN1/EN2), includes 36 ns input deglitch filtering to suppress fast transients, and delivers precise timing with typical 10 ns propagation delay and 3.5 ns pulse width distortion at 5 V supply-enabling reliable SPI and isolated sensor interface timing in motor control loops.

Key Specifications

Pinout & Package

SI86S640EC-AS1R is housed in a wide-body SOIC-16 (WB SOIC-16) package with creepage/clearance ≥8.3 mm, supporting 6000 VRMS reinforced isolation. Pin 1 is marked with dot; pin 16 is VDD2; GND1/GND2 are on opposite sides of the isolation barrier.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM4402ARWZ and ISO7741FDWR, SI86S640EC-AS1R uniquely combines 6000 VRMS reinforced isolation, 150 Mbps speed, AEC-Q100 Grade 1, and 36 ns input filtering-making it the only option qualified for high-voltage, high-speed, safety-critical automotive power systems without derating or additional protection circuitry.

Availability

SI86S640EC-AS1R is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and onboard chargers requiring stable component supply across automotive production lifecycles.

Supply support for SI86S640EC-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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-reliability applications.

The Si86S6xx family is engineered for automotive and industrial power systems demanding reinforced isolation, high-speed data integrity, and AEC-Q100 compliance-targeting next-generation EV power electronics and smart grid infrastructure.

FAQ

What is the isolation voltage rating of SI86S640EC-AS1R and which safety standards does it meet?

SI86S640EC-AS1R provides 6000 VRMS isolation for 1 minute per UL 1577 and reinforced insulation per IEC 60747-17. It also meets CSA 62368-1 and 60601-1, and CQC GB4943.1. This rating is validated for wide-body SOIC-16 packaging and supports 800 V battery system designs without external creepage enhancement.

Does SI86S640EC-AS1R require startup initialization or configuration before operation?

No, SI86S640EC-AS1R uses RF on/off keying modulation and requires no startup initialization. Outputs follow inputs within 0.3 ms after VDD exceeds UVLO+ (2.18 V), with internal 100 kΩ pulldown holding outputs low until stabilization. This eliminates firmware boot dependencies in safety-critical automotive control loops.

What is the meaning of the "EC" suffix in SI86S640EC-AS1R?

The "EC" suffix in SI86S640EC-AS1R denotes the fail-safe output configuration: default-high output state when the input supply (VDD1) is unpowered but the output supply (VDD2) remains active. This ensures gate drivers remain disabled during MCU power loss-critical for ASIL-B battery disconnect logic.

How does the 36 ns input deglitch filter in SI86S640EC-AS1R improve system reliability?

The 36 ns deglitch filter in SI86S640EC-AS1R blocks transient pulses shorter than 36 ns-such as those induced by 100 kV/µs CMTI events in SiC inverter switching-preventing false edge detection in isolated current sense or fault reporting paths. This eliminates need for external RC filters in high-noise power stages.

Can SI86S640EC-AS1R be used in SPI isolation applications, and what are its limitations?

SI86S640EC-AS1R supports SPI isolation via discrete channel mapping (e.g., A1/A2 for SCLK/MOSI, B1/B2 for MISO/CS), but lacks dedicated SPI control logic like the Si86SSx family. It does not integrate automatic direction control or buffered MI-so designers must manage chip select timing and bus arbitration externally in multi-slave configurations.