Skyworks Solutions Inc. SI86S641FC-AS1R

Overview

SI86S641FC-AS1R from Skyworks Solutions is a 4-channel reinforced digital isolator with bidirectional signal isolation across an integrated semiconductor barrier. It delivers DC to 150 Mbps data rate, 10 ns typical propagation delay, and 6000 VRMS isolation rating in a WB SOIC-16 package. It operates from 2.25–5.5 V supplies and supports fail-safe default-low output mode - used in isolated motor control gate drivers and battery management system communication interfaces.

For engineers reviewing the SI86S641FC-AS1R datasheet, SI86S641FC-AS1R pinout, SI86S641FC-AS1R application, or SI86S641FC-AS1R equivalent, key selection criteria include reinforced IEC 60747-17 certification, AEC-Q100 qualification for automotive use, Schmitt-trigger + CMOS input thresholds, tri-state output enable, and 36 ns input deglitch filtering capability.

Technical Context

The SI86S641FC-AS1R implements RF-based on/off keying modulation across its isolation barrier, eliminating startup initialization and enabling robust noise immunity up to 100 kV/µs CMTI. Its architecture includes independent UVLO and reset circuitry per side (VDD1/VDD2), with RSTB– threshold at ~1.7 V and UVLO– at 1.98 V.

It features four isolated bidirectional channels with dedicated EN1/EN2 enable inputs controlling all outputs on respective sides, and supports selectable fail-safe mode (default low, per ordering code "-AS1R"). Input deglitch filters with 36 ns pulse rejection are factory-enabled for this variant.

Key Specifications

Pinout & Package

SI86S641FC-AS1R is housed in a wide-body SOIC-16 (WB SOIC-16) package with creepage/clearance optimized for 6000 VRMS reinforced isolation. Pin layout follows Figure 2 (Si86S64x/L4x) in the datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM2401ARWZ and ISO6741FDWR, SI86S641FC-AS1R provides 6× higher data rate, 2.5× tighter propagation delay, 1000 VRMS higher isolation, factory-enabled 36 ns deglitching, and full AEC-Q100 Grade 1 qualification - making it uniquely suited for high-performance automotive and industrial real-time control.

Availability

SI86S641FC-AS1R is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management systems, and isolated switch-mode power supplies requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.

Supply support for SI86S641FC-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 analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.

The Si86S6xx family was designed specifically for high-reliability, high-speed galvanic isolation in automotive traction systems, industrial automation, and medical equipment - emphasizing reinforced safety certification, low-latency timing, and EMI resilience.

FAQ

What is the isolation voltage rating of SI86S641FC-AS1R and which safety standards does it meet?

SI86S641FC-AS1R is rated for 6000 VRMS isolation for 1 minute per UL 1577 and carries reinforced insulation certification per IEC 60747-17. It also meets CSA 62368-1 and 60601-1, and CQC GB4943.1 - enabling use in industrial, automotive, and medical systems requiring dual-barrier safety compliance. The wide-body SOIC-16 package ensures sufficient creepage and clearance for these ratings.

Does SI86S641FC-AS1R support fail-safe operation, and how is it configured?

Yes, SI86S641FC-AS1R is ordered with default-low fail-safe mode (indicated by "-AS1R" suffix). When VDD1 is unpowered but VDD2 remains active, all B-side outputs default to logic low - a critical safety feature for gate driver disable and BMS fault signaling. This behavior is hardwired and requires no external configuration.

What is the purpose of the 36 ns input deglitch filter in SI86S641FC-AS1R?

The 36 ns input deglitch filter in SI86S641FC-AS1R rejects narrow noise pulses (e.g., EFT bursts, switching spikes) shorter than 36 ns, preventing false edge detection in noisy environments like motor drives and inverters. Valid input pulses pass through with only 36 ns added delay - preserving signal integrity without compromising timing accuracy.

How does SI86S641FC-AS1R handle power supply sequencing and undervoltage conditions?

SI86S641FC-AS1R features independent UVLO monitors on VDD1 and VDD2 (UVLO– = 1.98 V, UVLO+ = 2.10 V) and reset thresholds (RSTB– ≈ 1.7 V). During startup, outputs remain low for 0.3 ms until both supplies stabilize. If either supply dips below UVLO–, outputs enter high-impedance or default state - ensuring deterministic behavior during brownouts.

Is SI86S641FC-AS1R compatible with standard 3.3 V and 5 V logic families?

Yes, SI86S641FC-AS1R supports 2.25–5.5 V operation on both sides, with CMOS-compatible input thresholds (VIH = 0.7 × VDDx, VIL = 0.3 × VDDx) and Schmitt-trigger hysteresis. It interfaces directly with 3.3 V microcontrollers and 5 V peripheral ICs without level shifters, and its 50 Ω output impedance matches standard transmission line routing practices.