Skyworks Solutions Inc. SI86S640FC-IS1

Overview

SI86S640FC-IS1 from Skyworks Solutions is a 4-channel reinforced digital isolator with bidirectional signal isolation across an integrated semiconductor barrier. It supports DC to 150 Mbps data rates, delivers 10 ns typical propagation delay, and provides 6000 VRMS isolation rating in a wide-body SOIC-16 package. It operates from 2.25–5.5 V supplies on both sides and is used in isolated motor control gate drivers and battery management system communication interfaces.

For engineers reviewing the SI86S640FC-IS1 datasheet, SI86S640FC-IS1 pinout, SI86S640FC-IS1 application, or SI86S640FC-IS1 equivalent, key selection criteria include its AEC-Q100 qualification, fail-safe default-high output option (indicated by 'F' in part number), 36 ns input deglitch filter, and compatibility with industrial and automotive isolated SPI and digital I/O systems requiring reinforced insulation per IEC 60747-17.

Technical Context

The SI86S640FC-IS1 implements RF-based on/off keying modulation across a monolithic semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical components. Its architecture includes Schmitt-trigger + CMOS threshold inputs, tri-state outputs with EN1/EN2 enable control, and selectable fail-safe mode (default high, per 'F' suffix).

It features independent undervoltage lockout (UVLO) and reset circuitry on both sides (VDD1/VDD2), with RSTB– threshold at ~1.7 V and UVLO– at 1.98 V. The device supports 36 ns input deglitch filtering (confirmed for Si86S64x family) and achieves 100 kV/µs CMTI minimum, meeting reinforced insulation requirements for safety-critical applications.

Key Specifications

Pinout & Package

SI86S640FC-IS1 is housed in a WB SOIC-16 (wide-body small-outline integrated circuit) package with creepage/clearance optimized for 6000 VRMS working voltage. Pin 1 is marked with a dot; the isolation barrier separates Side A (pins 1–8) and Side B (pins 9–16).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM2402BRWZ and ISO7741FDBQR, SI86S640FC-IS1 delivers higher speed (150 Mbps), stronger isolation (6000 VRMS), built-in 36 ns deglitching, and automotive qualification-making it uniquely suited for next-generation EV chargers and high-reliability industrial drives where timing precision and noise resilience are critical.

Availability

SI86S640FC-IS1 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 across extended temperature and safety-critical operating conditions.

Supply support for SI86S640FC-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 for high-performance wireless and power systems.

The Si86S6xx family was designed specifically for high-reliability, high-speed digital isolation in safety-critical industrial and automotive applications-emphasizing reinforced insulation, low propagation delay, and robust electromagnetic immunity.

FAQ

What does the 'F' in SI86S640FC-IS1 indicate?

The 'F' in SI86S640FC-IS1 denotes the fail-safe default-high output configuration. When the input-side supply (VDD1) is unpowered but the output-side supply (VDD2) remains active, the B-side outputs default to logic high. This behavior is confirmed in Table 4 of the datasheet and is critical for safety signaling in battery management and motor control systems where a known high state indicates normal operation or enables safe shutdown sequencing. SI86S640FC-IS1 implements this via internal configuration during manufacturing.

Does SI86S640FC-IS1 support SPI isolation?

Yes, SI86S640FC-IS1 supports isolated SPI communication through its four independent bidirectional channels. While it is not a dedicated SPI isolator like the Si86SSx series, its A1–A4/B1–B4 channels can be assigned to MOSI, MISO, SCLK, and CS signals. Its 150 Mbps data rate, 10 ns propagation delay matching, and 36 ns input deglitch filter make it suitable for high-fidelity SPI isolation in applications such as isolated ADC interfacing. SI86S640FC-IS1 requires external direction control logic if full-duplex SPI timing alignment is needed.

What is the purpose of the 36 ns input deglitch filter in SI86S640FC-IS1?

The 36 ns input deglitch filter in SI86S640FC-IS1 removes sub-36 ns noise pulses from A-side digital inputs before they cross the isolation barrier. As specified in Section 3.4.5 of the datasheet, this hardware filter prevents false triggering caused by EMI, switching noise, or contact bounce in harsh environments like motor drives and inverters. Any input pulse narrower than 36 ns is suppressed; wider pulses pass with a fixed 36 ns delay. SI86S640FC-IS1 includes this filter as a standard feature for the Si86S64x family, eliminating the need for external RC networks.

Is SI86S640FC-IS1 qualified for automotive applications?

Yes, SI86S640FC-IS1 is AEC-Q100 qualified for Grade 1 (–40 °C to +125 °C), with automotive-grade manufacturing flows and PPAP documentation support. It meets reinforced insulation requirements per IEC 60747-17 and carries safety certifications including UL 1577 (6000 VRMS), CSA 62368-1, and VDE 60747-17-making it suitable for onboard chargers, battery management systems, and traction inverters in BEV/HEV platforms. SI86S640FC-IS1 is explicitly listed in Skyworks' automotive applications section for these use cases.

How does the isolation barrier in SI86S640FC-IS1 differ from optocouplers?

SI86S640FC-IS1 uses a silicon-based RF carrier modulation architecture instead of LED-photodiode coupling. An RF oscillator modulates input signals via on/off keying, and a demodulator reconstructs them on the output side across a monolithic semiconductor barrier. This eliminates LED aging, enables DC-to-150 Mbps operation, removes startup initialization, and achieves 100 kV/µs CMTI-far exceeding typical optocoupler performance. SI86S640FC-IS1's architecture also supports precise timing (10 ns delay) and low power consumption without sacrificing noise immunity.