Skyworks Solutions Inc. SI86SL40BE-AS2R

Overview

SI86SL40BE-AS2R from Skyworks Solutions is a 4-channel, low-power digital isolator with reinforced 6000 VRMS isolation, AEC-Q100 qualified for automotive use, operating from 2.25 to 5.5 V supply and supporting data rates up to 150 Mbps. It features Schmitt-trigger + CMOS inputs, tri-state outputs with enable, selectable fail-safe default-high output, and operates across –40 to 125 °C in industrial and traction inverter systems.

For engineers reviewing the SI86SL40BE-AS2R datasheet, SI86SL40BE-AS2R pinout, SI86SL40BE-AS2R application, or SI86SL40BE-AS2R equivalent, this device serves as a high-immunity, low-quiescent-current isolation solution for bidirectional signal transfer across safety-critical barriers in battery management systems and onboard chargers where precise timing (10 ns propagation delay) and transient immunity (≥100 kV/µs) are required.

Technical Context

The SI86SL40BE-AS2R implements RF-based on/off keying modulation across a semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture delivers 10 ns typical propagation delay and 3.5 ns pulse width distortion while maintaining 6000 VRMS reinforced insulation per UL 1577 and IEC 60747-17.

It integrates side-specific undervoltage lockout (UVLO+ = 2.18 V, UVLO– = 2.05 V), reset detection (RSTB– ≈ 1.7 V), and fail-safe logic control via ordering option (default-high output). The device supports independent 2.25–5.5 V supplies on both sides and includes internal 100 kΩ weak pulldowns during unpowered states.

Key Specifications

Pinout & Package

SI86SL40BE-AS2R is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance), supporting 6000 VRMS isolation. Pin functions align with Si86S64x/L4x family configuration (Figure 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI86SL40BE-AS2R, SI8640ED-AS2R trades lower power for marginally better timing, while ADUM4402ARWZ offers broader distributor availability but lacks automotive qualification, 6000 VRMS rating, and wide-body creepage - making SI86SL40BE-AS2R the sole fit for ASIL-B/C BMS and OBC designs.

Availability

SI86SL40BE-AS2R is available at Aetrix Electronics and suitable for battery management systems, onboard chargers, and traction inverters requiring stable component supply, long-term automotive-grade lifecycle support, and traceable sourcing for ISO/TS 16949 production programs.

Supply support for SI86SL40BE-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 for high-reliability applications.

The Si86SLxx family is designed specifically for low-power, high-immunity digital isolation in automotive electrification and industrial power systems - emphasizing AEC-Q100 qualification, reinforced safety certification, and extended temperature operation.

FAQ

What is the isolation voltage rating of the SI86SL40BE-AS2R?

The SI86SL40BE-AS2R provides 6000 VRMS reinforced isolation for 1 minute per UL 1577, certified to IEC 60747-17, CSA 62368-1/60601-1, and CQC GB4943.1. This rating applies to the WB SOIC-16 package and supports safety-critical barriers in 800 V battery systems and medical power supplies where double/reinforced insulation is mandated.

Does the SI86SL40BE-AS2R require external startup initialization?

No, the SI86SL40BE-AS2R uses RF-based on/off keying modulation and requires no startup initialization sequence. Signal transfer begins immediately upon valid VDD1/VDD2 application above UVLO thresholds (2.18 V), eliminating boot delays in safety-critical monitoring paths such as BMS cell supervision.

What does the "BE" suffix indicate in SI86SL40BE-AS2R?

"BE" denotes the fail-safe output configuration: default-high output state when the input-side supply (VDD1) is unpowered but the output-side supply (VDD2) remains active. This ensures fault signals remain asserted during controller brownout - a requirement in ASIL-B/C battery monitoring architectures.

Can SI86SL40BE-AS2R replace optocouplers in existing designs?

Yes, the SI86SL40BE-AS2R is pin-compatible with industry-standard SOIC-16 optocoupler footprints (WB variant) and offers superior performance: 150 Mbps data rate vs. ~1 Mbps for standard optos, 10 ns propagation delay vs. >3 µs, and 6000 VRMS isolation vs. typically 3750–5000 VRMS. No layout change is needed beyond verifying creepage/clearance for wide-body package.

What are the supply bypass requirements for SI86SL40BE-AS2R?

The SI86SL40BE-AS2R requires two bypass capacitors per side: 0.1 µF ceramic and 10 µF bulk capacitor placed as close as possible between VDD1–GND1 and VDD2–GND2. This minimizes high-frequency noise coupling and ensures stable operation during fast edge transitions in motor control and power conversion applications.