Skyworks Solutions Inc. SI86S640FE-IS2R

Overview

SI86S640FE-IS2R from Skyworks Solutions is a 4-channel reinforced digital isolator with 6000 VRMS isolation, 150 Mbps data rate, and dual 2.25–5.5 V supply operation. It features Schmitt-trigger inputs, tri-state outputs with enable, selectable fail-safe default (high/low), and operates across –40 to 125 °C for use in isolated ADC interfaces, motor control gate drivers, and battery management system signal conditioning.

For engineers reviewing the SI86S640FE-IS2R datasheet, SI86S640FE-IS2R pinout, SI86S640FE-IS2R application, or SI86S640FE-IS2R equivalent, key selection criteria include reinforced IEC 60747-17 certification, 10 ns typical propagation delay, 3.5 ns pulse width distortion, transient immunity ≥100 kV/µs, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The SI86S640FE-IS2R 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 independent UVLO and reset per side (VDD1/VDD2), with 100 kΩ weak pulldown during unpowered states and configurable fail-safe output polarity.

It delivers four bidirectional isolated channels with CMOS/Schmitt-trigger input thresholds, tri-state output control via EN1/EN2 pins, and supports sleep mode via external SMb pin (though not implemented in this specific ordering option). The device requires only 0.1 µF and 10 µF bypass capacitors per supply rail and exhibits 50 Ω nominal output impedance for controlled-impedance PCB routing.

Key Specifications

Pinout & Package

SI86S640FE-IS2R is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance) with reinforced insulation structure and 6000 VRMS withstand rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM4402BRIZ and ISO6741FDWR, SI86S640FE-IS2R provides higher isolation voltage (6000 vs. 5000 VRMS), full AEC-Q100 Grade 0 qualification, and 150 Mbps capability-making it the only option suitable for next-generation 800 V EV traction inverters and high-fidelity isolated data acquisition.

Availability

SI86S640FE-IS2R is available at Aetrix Electronics and suitable for isolated ADC interfaces, motor control gate drivers, and battery management systems requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.

Supply support for SI86S640FE-IS2R 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 high-reliability analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for demanding wireless, automotive, and industrial markets.

The Si86S6xx family was designed specifically for high-speed, reinforced-isolation applications in electric vehicles, industrial automation, and medical equipment-emphasizing AEC-Q100 compliance, 6000 VRMS rating, and sub-10 ns timing precision.

FAQ

What is the isolation voltage rating of SI86S640FE-IS2R and which safety standards does it meet?

SI86S640FE-IS2R has a 6000 VRMS isolation rating per UL 1577 and is certified to IEC 60747-17 for reinforced insulation. It also meets CSA 62368-1 and 60601-1, and CQC GB4943.1. These certifications validate its use in safety-critical automotive and medical systems where dual insulation barriers are mandated. SI86S640FE-IS2R maintains this rating across its full operating temperature range.

Does SI86S640FE-IS2R support fail-safe output configuration, and how is it selected?

Yes, SI86S640FE-IS2R offers selectable fail-safe output polarity-default high or default low-determined by ordering option (encoded in the part number suffix). This feature ensures predictable output states during power loss on either side, critical for safe shutdown in motor control and battery management. SI86S640FE-IS2R implements this via internal configuration fuses set at manufacture; no external components or pins are required to configure the mode.

What are the supply voltage requirements and power consumption characteristics of SI86S640FE-IS2R?

SI86S640FE-IS2R operates from 2.25 V to 5.5 V on both VDD1 and VDD2 rails independently. At 5 V and DC input, typical supply currents are 0.84 mA (side A) and 2.83 mA (side B). With 500 kHz square-wave inputs and 15 pF loads, total IDD1 + IDD2 is ≤ 4.82 mA. SI86S640FE-IS2R requires only 0.1 µF and 10 µF bypass capacitors per supply-no external regulators or LDOs needed.

How does SI86S640FE-IS2R handle undervoltage and reset conditions on each side?

SI86S640FE-IS2R features independent UVLO and reset circuits per side. VDD1 and VDD2 each have dedicated UVLO+ (2.18 V typ) and UVLO– (2.05 V typ) thresholds, plus RSTB+ (~1.7 V) and RSTB– (~1.7 V) reset triggers. When either supply drops below RSTB–, that side resets and reloads configuration upon recovery. SI86S640FE-IS2R uses 100 kΩ weak pulldowns on outputs during unpowered states to ensure defined logic levels before stabilization.

Is SI86S640FE-IS2R pin-compatible with other members of the Si86S6xx family, and what package does it use?

Yes, SI86S640FE-IS2R uses the WB SOIC-16 package (10.3 mm creepage) and shares identical pinout with all Si86S64x variants (e.g., SI86S641, SI86S642), differing only in channel directionality and fail-safe configuration. Pins A1–A4, B1–B4, EN1, EN2, VDD1/GND1, VDD2/GND2, and NC positions are fully aligned. SI86S640FE-IS2R is not pin-compatible with Si86S63x (3-channel) or Si86S66x (6-channel) variants due to different I/O counts and pin assignments.