Skyworks Solutions Inc. SI86S661EC-IS1R

Overview

SI86S661EC-IS1R from Skyworks Solutions is a 6-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 output, and operates across –40 to 125 °C for automotive battery management and industrial motor control systems.

For engineers reviewing the SI86S661EC-IS1R datasheet, SI86S661EC-IS1R pinout, SI86S661EC-IS1R application, or SI86S661EC-IS1R 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 traction inverter gate drive isolation.

Technical Context

The SI86S661EC-IS1R implements RF-based on/off keying modulation across a semiconductor isolation barrier-eliminating startup initialization and delivering superior CMTI performance versus optocouplers. Its architecture supports independent UVLO and reset monitoring per side (VDD1/VDD2), with RSTB thresholds at ~1.7 V and UVLO hysteresis of 105–160 mV.

All six channels are bidirectional-capable via external enable control (EN1/EN2), with tri-state output support and configurable fail-safe state determined at power-up based on ordering option. The device integrates 50 Ω nominal output impedance drivers and requires only 0.1 µF + 10 µF bypass capacitors per supply rail.

Key Specifications

Pinout & Package

SI86S661EC-IS1R is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance), supporting 6000 VRMS reinforced isolation. Pin layout follows Figure 4 (Si86S66x) in the datasheet, with side-A and side-B I/O banks separated by an internal 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, SI86S661EC-IS1R delivers higher data rate, higher isolation voltage, AEC-Q100 qualification, and tighter timing specs-making it optimal for automotive traction inverters and high-fidelity isolated sensor interfaces where performance and safety certification are non-negotiable.

Availability

SI86S661EC-IS1R is available at Aetrix Electronics and suitable for automotive battery management systems, industrial motor control gate drivers, and onboard charger feedback loops requiring stable component supply and long-term lifecycle support.

Supply support for SI86S661EC-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.

The Si86S6xx family is engineered for high-reliability isolation in automotive and industrial power systems-delivering reinforced safety certification, ultra-low propagation delay, and robust CMTI performance for next-generation EV and industrial automation platforms.

FAQ

What is the isolation rating and safety certification status of SI86S661EC-IS1R?

SI86S661EC-IS1R provides 6000 VRMS reinforced isolation per UL 1577 (1 minute) and is certified to VDE 60747-17, CSA 62368-1, and CQC GB4943.1. These certifications are fully documented and validated for automotive and industrial end-equipment compliance. SI86S661EC-IS1R meets IEC 60747-17 reinforced insulation requirements for systems up to 800 V working voltage.

Does SI86S661EC-IS1R support fail-safe output configuration, and how is it implemented?

Yes, SI86S661EC-IS1R offers selectable fail-safe mode (default high or low) determined by ordering option. When VDD1 or VDD2 drops below UVLO threshold, outputs transition to the preconfigured state-ensuring predictable behavior during power faults. This is implemented via internal configuration fuses set at manufacturing and does not require external circuitry. SI86S661EC-IS1R uses this feature for safe gate driver disable in traction inverters.

What are the supply voltage requirements and power consumption characteristics of SI86S661EC-IS1R?

SI86S661EC-IS1R operates from 2.25 V to 5.5 V on both VDD1 and VDD2 rails, with typical quiescent current of 2.29 mA per side at 5 V and static inputs. At 500 kHz square-wave input with 15 pF load, total IDD1 + IDD2 is 1.93 + 2.66 mA. The device requires only 0.1 µF and 10 µF bypass capacitors per supply-no external regulators or LDOs needed. SI86S661EC-IS1R supports low-power design without sacrificing timing performance.

How does SI86S661EC-IS1R handle power-up sequencing and undervoltage conditions?

SI86S661EC-IS1R features independent UVLO monitors on VDD1 and VDD2 with thresholds of 2.10–2.25 V (rising) and 1.98–2.12 V (falling), plus dedicated reset detection at ~1.7 V. Outputs remain in weak-pull-down state (100 kΩ) for 0.3 ms after VDD rise, then follow inputs or enter configured fail-safe state. SI86S661EC-IS1R guarantees correct behavior even with asymmetric power-up sequences between sides.

What packaging and creepage specifications apply to SI86S661EC-IS1R?

SI86S661EC-IS1R uses a WB SOIC-16 package with 10.3 mm minimum creepage and clearance, enabling 6000 VRMS reinforced isolation. The wide-body construction meets IPC-2221B spacing rules for functional and reinforced insulation in 800 V systems. SI86S661EC-IS1R is RoHS-compliant and qualified for reflow soldering at 260 °C peak temperature for 10 seconds.