Skyworks Solutions Inc. SI86S640EB-IU

Overview

SI86S640EB-IU from Skyworks Solutions is a 4-channel, reinforced digital isolator with 6000 VRMS isolation rating, 150 Mbps data rate, and 10 ns typical propagation delay. It features Schmitt-trigger + CMOS inputs, tri-state outputs with enable, selectable fail-safe mode (default high/low), and operates across –40 to 125 °C in industrial and automotive systems such as isolated ADC interfaces and battery management units.

For engineers reviewing the SI86S640EB-IU datasheet, SI86S640EB-IU pinout, SI86S640EB-IU application, or SI86S640EB-IU equivalent, key selection criteria include reinforced IEC 60747-17 certification, 2.25–5.5 V dual-supply operation, 36 ns input deglitch filtering, AEC-Q100 qualification, and WB SOIC-16 package compatibility with 8 mm creepage/clearance.

Technical Context

The SI86S640EB-IU implements RF-based on/off keying modulation across a semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity. Its architecture supports independent side-A and side-B undervoltage lockout (UVLO) with 2.10–2.25 V thresholds and reset detection at ~1.7 V, ensuring deterministic behavior during power transients.

It integrates four unidirectional channels (A1–A4 to B1–B4), active-high enable pins (EN1/EN2), and failsafe output control via ordering option. The device includes 36 ns input deglitch filters-confirmed for SI86S64x variants-and supports tri-state output control without requiring external pull-ups or level shifters.

Key Specifications

Pinout & Package

SI86S640EB-IU is housed in a wide-body SOIC-16 (WB SOIC-16) package with 8.0 mm creepage and clearance, supporting 6000 VRMS isolation. Pinout follows Figure 2 of the datasheet for Si86S64x/L4x devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM140D0BRIZ and ISO6741FDWR, SI86S640EB-IU delivers higher isolation (6000 VRMS), automotive qualification, and deterministic noise rejection via 36 ns deglitching-making it uniquely suited for safety-critical, high-noise, high-voltage applications where reliability cannot be compromised.

Availability

SI86S640EB-IU is available at Aetrix Electronics and suitable for industrial automation systems, battery management systems, and isolated switch mode supplies requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.

Supply support for SI86S640EB-IU 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 digital isolation in automotive, industrial, and medical systems-emphasizing safety certification, noise immunity, and extended temperature operation.

FAQ

What is the isolation rating and safety certification status of SI86S640EB-IU?

SI86S640EB-IU is rated for 6000 VRMS isolation per UL 1577 (1 minute) and carries reinforced insulation certification per VDE 60747-17, CSA 62368-1, and CQC GB4943.1. These certifications are fully documented in Skyworks' safety file and apply directly to the SI86S640EB-IU part number in its WB SOIC-16 package.

Does SI86S640EB-IU require external bypass capacitors, and if so, what values?

Yes, SI86S640EB-IU requires two bypass capacitors per side: a 0.1 µF ceramic capacitor and a 10 µF bulk capacitor placed between VDD1/GND1 and VDD2/GND2. These must be located as close as possible to the respective supply pins to ensure stable operation and meet EMC requirements per the SI86S6xx datasheet Section 3.2.1.

What does the 'E' in SI86S640EB-IU indicate, and how does it affect output behavior?

The 'E' in SI86S640EB-IU specifies the default-low fail-safe output option. When the input-side supply (VDD1) is unpowered but the output-side supply (VDD2) remains active, all B1–B4 outputs default to logic low-ensuring safe deactivation of downstream circuitry such as gate drivers or relay controls.

Is SI86S640EB-IU compatible with 3.3 V and 5 V logic levels on both sides simultaneously?

Yes, SI86S640EB-IU supports independent 2.25–5.5 V operation on VDD1 and VDD2. This allows direct interface with 3.3 V MCUs on Side A and 5 V peripheral logic on Side B-or vice versa-without external level shifters, thanks to its CMOS/Schmitt-trigger input thresholds referenced to each side's VDD.

What is the purpose of the 36 ns input deglitch filter in SI86S640EB-IU, and is it enabled by default?

The 36 ns input deglitch filter is built into SI86S640EB-IU and is always active on all four A-side inputs. It rejects noise pulses shorter than 36 ns-such as those from EFT bursts or power supply switching-preventing false triggering while adding only 36 ns deterministic delay to valid signals.