Skyworks Solutions Inc. SI86SS41BC-IS1R

Overview

SI86SS41BC-IS1R from Skyworks Solutions is a 4-channel, SPI-compatible digital isolator with reinforced 6000 VRMS isolation, 150 Mbps data rate, and 10 ns typical propagation delay. It features side-A (controller-side) SPI interface pins (MCSb, MCLK, MO, MI) and side-B (peripheral-side) isolated SPI outputs (SCSb, SCLK, SI) plus one isolated input (SO), operating across 2.25–5.5 V supplies and –40 to +125 °C. It is used in isolated industrial PLCs, battery management systems, and motor control gate drivers requiring robust noise immunity and fail-safe default-low output.

For engineers reviewing the SI86SS41BC-IS1R datasheet, SI86SS41BC-IS1R pinout, SI86SS41BC-IS1R application, or SI86SS41BC-IS1R equivalent, key selection criteria include its dedicated SPI channel mapping, absence of reset functionality (distinguishing it from SI86SS51), WB SOIC-16 package with 8.3 mm creepage, and compatibility with isolated ADC/DAC interfaces in high-noise power electronics.

Technical Context

The SI86SS41BC-IS1R implements RF-based on/off keying modulation across a semiconductor isolation barrier, eliminating startup initialization and enabling deterministic timing. Its architecture supports bidirectional SPI signal isolation with fixed directionality: MO→MI (A→B) and SO→SI (B→A), while MCSb and SCSb provide synchronized chip select isolation.

It integrates undervoltage lockout (UVLO+ = 2.18 V, UVLO– = 2.05 V) and internal 100 kΩ pulldown resistors during unpowered states, ensuring predictable low-default output behavior per ordering option. The device meets IEC 60747-17 reinforced insulation requirements and achieves ≥100 kV/µs CMTI.

Key Specifications

Pinout & Package

SI86SS41BC-IS1R is housed in a wide-body SOIC-16 (WB SOIC-16) package with 8.3 mm creepage and 10.3 mm clearance, certified for 6000 VRMS isolation per UL 1577.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM3401CRWZ, SI86SS41BC-IS1R delivers 3× higher data rate and 60% lower propagation delay while supporting dual-supply flexibility and reinforced 6000 VRMS isolation. Against SI86SS51BC-IS1R, it removes reset functionality to reduce complexity where isolated reset is unnecessary.

Availability

SI86SS41BC-IS1R is available at Aetrix Electronics and suitable for industrial automation systems, battery management systems, and motor control gate driver interfaces requiring stable component supply across extended temperature and high-isolation environments.

Supply support for SI86SS41BC-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 Si86Sxx family was designed specifically for high-reliability, high-speed digital isolation in automotive and industrial systems, emphasizing reinforced safety certification, low-latency timing, and robust electromagnetic immunity.

FAQ

What is the isolation rating and safety certification status of SI86SS41BC-IS1R?

SI86SS41BC-IS1R provides 6000 VRMS isolation for 1 minute per UL 1577 and meets IEC 60747-17 reinforced insulation requirements. It is certified to CSA 62368-1 and VDE 60747-17, with pending CQC GB4943.1 approval. These certifications validate its use in safety-critical applications such as onboard chargers and industrial inverters where reinforced barrier integrity is mandated.

How does SI86SS41BC-IS1R differ from SI86SS51BC-IS1R in functionality and pinout?

SI86SS41BC-IS1R and SI86SS51BC-IS1R share identical pinout, isolation rating, data rate, and supply specifications. The key difference is that SI86SS51BC-IS1R adds RST (pin 6) and ISO_RST (pin 11) for isolated reset signaling, whereas SI86SS41BC-IS1R uses those pins as NC. This makes SI86SS41BC-IS1R optimal for SPI-only isolation without reset coordination overhead.

Does SI86SS41BC-IS1R require external startup initialization or configuration?

No, SI86SS41BC-IS1R requires no startup initialization or configuration. Its RF-based modulation architecture enables immediate operation upon power-up. Outputs follow inputs after a 0.3 ms stabilization period defined by UVLO thresholds (VDDUV+ = 2.18 V), with internal 100 kΩ pulldowns holding outputs low until valid supply is established - a feature confirmed in Table 5 of the datasheet.

What are the recommended bypass capacitors and layout practices for SI86SS41BC-IS1R?

Skyworks specifies 0.1 µF ceramic + 10 µF bulk capacitors between VDD1–GND1 and VDD2–GND2, placed within 3 mm of respective pins. PCB layout must maintain ≥8.3 mm creepage across the isolation barrier, avoid routing traces over the barrier, and use controlled-impedance routing (50 Ω ±40%) for SCLK and SI/SO lines to minimize reflections at 150 Mbps.

Can SI86SS41BC-IS1R operate with mismatched supply voltages on Side A and Side B?

Yes, SI86SS41BC-IS1R supports independent 2.25–5.5 V supplies on VDD1 and VDD2. This enables direct interfacing between a 3.3 V MCU (Side A) and 5 V isolated peripherals (Side B) without level shifters. Electrical specifications - including VOH/VOL, propagation delay, and CMTI - are guaranteed across the full voltage range on each side, as verified in Tables 8–10 of the datasheet.