Skyworks Solutions Inc. SI86SL40BC-IS1R

Overview

SI86SL40BC-IS1R from Skyworks Solutions is a 4-channel, low-power digital isolator with reinforced 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. It is used in battery management systems and traction inverters where high noise immunity and safety-certified signal isolation are required.

For engineers reviewing the SI86SL40BC-IS1R datasheet, SI86SL40BC-IS1R pinout, SI86SL40BC-IS1R application, or SI86SL40BC-IS1R equivalent, key selection criteria include its 6000 VRMS reinforced insulation (IEC 60747-17), 10 ns typical propagation delay, 3.5 ns pulse width distortion, 100 kV/µs CMTI, and support for dual-supply operation from 2.25 V to 5.5 V on both sides.

Technical Context

The SI86SL40BC-IS1R implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture supports bidirectional channel operation with independent side-A and side-B undervoltage lockout (UVLO) and reset thresholds (RSTB± ~1.7 V).

This device belongs to the Si86SLx subfamily optimized for reduced quiescent current-0.25 mA per channel lower than Si86S6x variants-while retaining identical pinout and functional compatibility. It includes tri-state output control via EN1/EN2 pins and supports fail-safe configuration (default high or low) determined at ordering.

Key Specifications

Pinout & Package

SI86SL40BC-IS1R is housed in a wide-body SOIC-16 (WB SOIC-16) package with creepage/clearance compliant for 6000 VRMS working voltage. Pin numbering follows standard JEDEC SOIC-16 layout with isolation barrier between 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 SI86SL40BC-IS1R, SI8640BB-IS1R offers identical functionality at higher quiescent power, while ADUM4400ARWZ provides lower isolation rating and no automotive qualification-making SI86SL40BC-IS1R the sole choice for ASIL-B/C-compliant traction and charging systems requiring 6000 VRMS.

Availability

SI86SL40BC-IS1R is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and onboard chargers requiring stable component supply with long-term automotive-grade lifecycle support.

Supply support for SI86SL40BC-IS1R 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 markets.

The Si86S6xx/Lxx family was designed specifically for automotive and industrial isolation needs-delivering reinforced safety certification, extended temperature operation, and RF-based noise immunity without optical aging limitations.

FAQ

What is the isolation voltage rating of the SI86SL40BC-IS1R?

The SI86SL40BC-IS1R is rated for 6000 VRMS isolation for one minute per UL 1577 and certified to IEC 60747-17 for reinforced insulation. This rating applies to the WB SOIC-16 package and is validated for continuous working voltage in automotive and industrial end-equipment meeting IEC 62368-1 and IEC 60601-1 standards. SI86SL40BC-IS1R achieves this via its proprietary silicon-based isolation barrier and package construction.

Does the SI86SL40BC-IS1R require external configuration or initialization at power-up?

No, the SI86SL40BC-IS1R uses an RF on/off keying architecture that requires no startup initialization sequence. Outputs follow inputs immediately after exiting undervoltage lockout (UVLO), with a typical start-up time of 0.3 ms. The SI86SL40BC-IS1R enters normal operation autonomously once VDD1 and VDD2 exceed 2.18 V, eliminating firmware dependencies or configuration registers.

How does the fail-safe mode work on the SI86SL40BC-IS1R?

The SI86SL40BC-IS1R offers factory-configured fail-safe behavior: when VDD1 is unpowered but VDD2 remains active, outputs default to either logic high or logic low based on the ordering option suffix (e.g., "BC" denotes default-low). This prevents undefined states in safety-critical paths such as gate driver disable signals. SI86SL40BC-IS1R implements this via internal bias networks tied to the isolation barrier design.

What is the difference between SI86SL40BC-IS1R and SI86S640BC-IS1R?

The SI86SL40BC-IS1R is the low-power variant of the Si86S640 family, consuming ≈0.25 mA less per channel in quiescent operation while maintaining identical pinout, timing specs (10 ns propagation delay), and safety certifications. SI86SL40BC-IS1R achieves this through architectural tuning-not reduced performance-but optimized transistor biasing and clock gating. Both share the same WB SOIC-16 footprint and functional behavior.

Can the SI86SL40BC-IS1R be used in SPI isolation applications?

Yes, the SI86SL40BC-IS1R supports SPI isolation when configured with appropriate channel direction and enable control-though it lacks dedicated SPI protocol logic like the Si86SSx series. Its four independent bidirectional channels can isolate MOSI, MISO, SCLK, and CS signals with external direction management. SI86SL40BC-IS1R's 150 Mbps data rate and 10 ns propagation delay ensure reliable full-duplex SPI operation up to 37.5 MHz clock rates.