Skyworks Solutions Inc. SI86S661EB-IUR

Overview

SI86S661EB-IUR from Skyworks Solutions is a 6-channel reinforced digital isolator with bidirectional signal isolation across a semiconductor-based barrier, supporting up to 150 Mbps data rate, 10 ns typical propagation delay, and 6000 VRMS isolation rating. It operates from 2.25–5.5 V supplies on both sides and features selectable fail-safe output (default low), tri-state outputs with enable, and AEC-Q100 qualification for automotive systems including battery management and traction inverters.

For engineers reviewing the SI86S661EB-IUR datasheet, SI86S661EB-IUR pinout, SI86S661EB-IUR application, or SI86S661EB-IUR equivalent, this device is evaluated for high-noise industrial motor control, isolated ADC/DAC interfaces, and automotive onboard chargers where precise timing, high CMTI (>100 kV/µs), and reinforced insulation per IEC 60747-17 are required.

Technical Context

The SI86S661EB-IUR implements RF-based on/off keying modulation across its isolation barrier-eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture integrates six independent CMOS/Schmitt-trigger input channels with side-specific enable (EN1/EN2) and supports fail-safe default-low output behavior during unpowered conditions on either side.

It delivers deterministic timing performance: 10 ns typical propagation delay, 3.5 ns pulse width distortion, and operates across –40 °C to +125 °C ambient temperature. The device meets UL 1577 (6000 VRMS), CSA 62368-1/60601-1, VDE 60747-17, and CQC GB4943.1 safety standards in its WB SOIC-16 package.

Key Specifications

Pinout & Package

SI86S661EB-IUR is housed in a wide-body SOIC-16 (WB SOIC-16) package with creepage/clearance optimized for 6000 VRMS reinforced insulation. Pin 1 is marked with a dot; pins 1–8 reside on Side A (input side), pins 9–16 on Side B (output side), separated by an internal semiconductor isolation barrier.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM6601ARIZ-RL and ISO6760FDWR, SI86S661EB-IUR delivers higher data rate (150 vs. 50 Mbps), certified 6000 VRMS reinforced insulation, AEC-Q100 qualification, and factory-configured default-low fail-safe-making it uniquely suited for high-reliability automotive and industrial power systems requiring deterministic fault behavior.

Availability

SI86S661EB-IUR 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 SI86S661EB-IUR 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 high-performance analog and mixed-signal components for wireless, automotive, and industrial markets.

The Si86S6xx family was designed specifically for high-reliability galvanic isolation in harsh environments-targeting automotive electrification, industrial automation, and medical electronics where safety certification, timing precision, and noise immunity are non-negotiable.

FAQ

What is the isolation rating and safety certification status of the SI86S661EB-IUR?

The SI86S661EB-IUR is rated for 6000 VRMS isolation per UL 1577 (1 minute) and carries reinforced insulation certification per IEC 60747-17, CSA 62368-1/60601-1, and CQC GB4943.1. These certifications are fully documented in Skyworks' official safety reports and apply directly to the SI86S661EB-IUR in its WB SOIC-16 package. SI86S661EB-IUR meets requirements for functional safety in automotive and medical end-equipment.

Does the SI86S661EB-IUR require external startup initialization or configuration?

No, the SI86S661EB-IUR uses RF-based on/off keying modulation and requires no firmware, register writes, or clock synchronization at power-up. Outputs follow inputs immediately after undervoltage lockout (UVLO) exit (~0.3 ms after VDD reaches 2.18 V). SI86S661EB-IUR enters normal operation autonomously-no external programming or handshake is needed.

What does the "E" in SI86S661EB-IUR indicate, and how does it affect system behavior?

The "E" suffix denotes the default-low fail-safe output option: when VDD1 is unpowered but VDD2 remains active, all B-side outputs (B1–B6) default to logic low. This behavior is factory-set and irreversible. SI86S661EB-IUR ensures safe deactivation of downstream drivers or assertion of fault flags during primary-side power loss-critical in BMS and inverter protection circuits.

Can the SI86S661EB-IUR support bidirectional communication on individual channels?

No-SI86S661EB-IUR provides six unidirectional channels (A1→B1 through A6→B6). Directionality is fixed per channel; it does not support dynamic reversal like the Si86SQ44. For bidirectional bus isolation (e.g., I²C), external logic or a dedicated bidirectional isolator variant must be used. SI86S661EB-IUR is optimized for point-to-point forward signaling with guaranteed timing and fail-safe behavior.

What are the recommended bypass capacitors and layout practices for SI86S661EB-IUR?

Skyworks specifies 0.1 µF ceramic + 10 µF bulk capacitors between VDD1/GND1 and VDD2/GND2, placed within 3 mm of respective pins. SI86S661EB-IUR also requires ≥8.3 mm creepage/clearance across the isolation barrier on PCB; WB SOIC-16 footprint satisfies this. Avoid routing high-dV/dt traces near GND1/GND2 or across the barrier. SI86S661EB-IUR achieves optimal CMTI only with proper grounding and decoupling per AN1359.