Skyworks Solutions Inc. SI86SQ44BE-AS2R

Overview

SI86SQ44BE-AS2R from Skyworks Solutions is a 5-channel, bidirectional digital isolator with QSPI bus support, featuring configurable signal direction (A↔B), 150 Mbps data rate, 10 ns typical propagation delay, and 6000 VRMS reinforced isolation rated per UL 1577 and IEC 60747-17. It operates across 2.25–5.5 V supplies and supports industrial motor control and automotive battery management systems.

For engineers reviewing the SI86SQ44BE-AS2R datasheet, SI86SQ44BE-AS2R pinout, SI86SQ44BE-AS2R application, or SI86SQ44BE-AS2R equivalent, key selection considerations include its custom QSPI-direction control architecture, dual enable inputs (EN_A/EN_B), ISO_DIR output for isolated direction signaling, and fail-safe default-low output configuration confirmed in ordering code "BE".

Technical Context

The SI86SQ44BE-AS2R implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity (100 kV/µs CMTI). Its five-channel topology comprises four bidirectional I/O channels (A1–A4/B1–B4) and one dedicated forward-direction DIR_IN/ISO_DIR pair.

Direction is controlled by the DIR input on Side A, which configures all four data channels simultaneously; ISO_DIR provides an isolated copy of that state to Side B. EN_A and EN_B independently place respective side outputs into high-impedance state, supporting tristate bus arbitration in isolated QSPI implementations.

Key Specifications

Pinout & Package

SI86SQ44BE-AS2R is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance), supporting 6000 VRMS isolation. Pin assignments are validated per Figure 6 and Table 3 of Skyworks datasheet 206553B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM3481BRNZ and ISO6741QDWR, SI86SQ44BE-AS2R uniquely integrates direction control, ISO_DIR output, and default-low fail-safe behavior-enabling single-chip QSPI isolation without external glue logic or compromise on safety rating or speed.

Availability

SI86SQ44BE-AS2R 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 SI86SQ44BE-AS2R 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 Si86Sxx family-including SI86SQ44BE-AS2R-is engineered for high-reliability isolation in automotive, industrial, and medical systems, emphasizing reinforced safety certification, high CMTI, and flexible bus interface support.

FAQ

What is the isolation rating and safety certification status of SI86SQ44BE-AS2R?

SI86SQ44BE-AS2R is rated for 6000 VRMS isolation per UL 1577 (1 minute) and carries reinforced insulation certifications per VDE 60747-17, CSA 62368-1, and CQC GB4943.1. These approvals are documented in Skyworks datasheet 206553B and validate its use in high-voltage industrial and automotive applications where reinforced barrier integrity is mandatory. SI86SQ44BE-AS2R meets the safety requirements for systems operating up to 1000 VAC mains.

How does the DIR and ISO_DIR functionality work in SI86SQ44BE-AS2R?

In SI86SQ44BE-AS2R, the DIR input on Side A determines signal flow direction for all four bidirectional data channels: high = A→B, low = B→A. The ISO_DIR output on Side B provides a synchronized, isolated copy of that DIR state, enabling coordinated peripheral-side response without additional isolation components. This architecture is explicitly designed for QSPI bus isolation and is validated in Figure 14 and Section 3.4.4 of the SI86SQ44BE-AS2R datasheet.

What does the "BE" suffix indicate in SI86SQ44BE-AS2R?

Within Skyworks' Si86Sxx ordering nomenclature, the "BE" suffix in SI86SQ44BE-AS2R specifies the fail-safe output configuration: default-low output state when either VDD1 or VDD2 is unpowered. This behavior is confirmed in Table 4 (Si86S6x/Lx/Mx Logic Operation) and Section 3.3 of the datasheet, and is critical for safety-critical applications like battery management where low-state outputs prevent unintended activation during power faults.

Does SI86SQ44BE-AS2R support tristate output control, and how is it implemented?

Yes, SI86SQ44BE-AS2R supports independent tristate control via EN_A and EN_B pins. When EN_A is low, all Side A outputs (including ISO_DIR) enter high-impedance state; when EN_B is low, all Side B outputs (B1–B4) go high-Z. This enables bus sharing and arbitration in multi-master QSPI configurations. The 10 kΩ pull-up recommendation for each enable pin is specified in Section 3.4.4 of the SI86SQ44BE-AS2R datasheet.

What package type and creepage distance does SI86SQ44BE-AS2R use?

SI86SQ44BE-AS2R is supplied in a WB SOIC-16 package (wide-body SOIC), providing 10.3 mm minimum creepage and clearance-sufficient to support its 6000 VRMS UL 1577 rating. This package is explicitly listed in the RoHS-compliant packages section (page 2) and referenced in Figure 6 of the SI86SQ44BE-AS2R datasheet. It is distinct from NB SOIC-16 and QSOP-16 variants in physical dimensions and isolation capability.