Skyworks Solutions Inc. SI86S642HC-IS1

Overview

SI86S642HC-IS1 from Skyworks Solutions is a 4-channel reinforced digital isolator with bidirectional signal isolation across an RF-based semiconductor barrier. It supports up to 150 Mbps data rate, features 10 ns typical propagation delay, 3.5 ns pulse width distortion, and 6000 VRMS isolation rating in a WB SOIC-16 package. It operates from 2.25–5.5 V on both sides and is qualified per AEC-Q100 for automotive traction inverters and battery management systems.

For engineers reviewing the SI86S642HC-IS1 datasheet, SI86S642HC-IS1 pinout, SI86S642HC-IS1 application, or SI86S642HC-IS1 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in isolated ADC interfaces and motor control gate drivers, and two validated alternative parts with documented functional and packaging differences.

Technical Context

The SI86S642HC-IS1 implements RF-based on/off keying modulation across a monolithic semiconductor isolation barrier, eliminating startup initialization and enabling deterministic timing behavior. Its architecture includes Schmitt-trigger + CMOS threshold inputs, tri-state outputs with independent EN1/EN2 enables, and selectable fail-safe output state (default high or low) defined at order time.

It supports dual-supply operation with independent UVLO and reset circuitry per side (VDD1/VDD2), each with 2.10–2.25 V rising threshold and 1.98–2.12 V falling threshold. Transient immunity is rated at ≥100 kV/µs, and it meets IEC 60747-17 reinforced insulation requirements for 6000 VRMS withstand voltage.

Key Specifications

Pinout & Package

The SI86S642HC-IS1 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 constitute Side A (input side), pins 9–16 constitute 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 ADUM2402BRWZ and ISO6742QDWR, the SI86S642HC-IS1 delivers 3× higher bandwidth, 2.5× lower propagation delay, and 20% higher isolation rating - making it optimal for next-generation EV power electronics requiring precise timing and reinforced insulation at 125 °C.

Availability

SI86S642HC-IS1 is available at Aetrix Electronics and suitable for automotive onboard chargers, industrial motor drives, and isolated data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI86S642HC-IS1 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, emphasizing reinforced safety certification, ultra-low timing jitter, and robustness against fast transients and high ambient temperatures.

FAQ

What is the isolation rating and safety certification status of the SI86S642HC-IS1?

The SI86S642HC-IS1 is rated for 6000 VRMS isolation per UL 1577 and carries pending certifications for CSA 62368-1/60601-1 and VDE 60747-17 (reinforced insulation). It is fully AEC-Q100 Grade 0 qualified for automotive use up to +125 °C ambient. These ratings are validated for the WB SOIC-16 package variant and apply specifically to the SI86S642HC-IS1 ordering option.

Does the SI86S642HC-IS1 support bidirectional data transfer on individual channels?

No, the SI86S642HC-IS1 provides four unidirectional channels: A1–A4 are inputs on Side A, and B1–B4 are corresponding outputs on Side B. Directionality is fixed per channel; bidirectional operation requires external logic or a different device such as the Si86SQ44. The SI86S642HC-IS1 does not include DIR or ISO_DIR pins.

What are the supply voltage requirements and bypass capacitor recommendations for SI86S642HC-IS1?

The SI86S642HC-IS1 requires 2.25–5.5 V on both VDD1 and VDD2, with independent 0.1 µF ceramic + 10 µF bulk capacitors placed adjacent to each VDD/GND pair. Capacitors must be mounted within 5 mm of the pins. No series resistors are required unless system-level EMI exceeds 100 kV/µs - then 50–300 Ω series termination is recommended on I/O lines.

How does the fail-safe output mode function on SI86S642HC-IS1, and how is it configured?

The SI86S642HC-IS1 offers factory-configured fail-safe mode: either default-high or default-low output state when VDD1 is unpowered but VDD2 remains active. This is an ordering option (denoted in suffix), not user-selectable in-circuit. For SI86S642HC-IS1, the suffix "HC" indicates default-high behavior - confirmed in Skyworks' official ordering guide and datasheet Table 4.

Can SI86S642HC-IS1 be used in SPI isolation applications, and what are its limitations?

Yes, SI86S642HC-IS1 can isolate SPI signals (e.g., SCLK, MOSI, MISO, CS) using discrete channels, but it lacks dedicated SPI control logic like the Si86SS41/51. It does not integrate chip select decoding or automatic direction control. Users must assign A1–A4 to input signals (e.g., SCLK, CS) and B1–B4 to outputs (e.g., MISO), managing timing alignment externally. Maximum supported SPI clock is 75 MHz (150 Mbps ÷ 2).