Skyworks Solutions Inc. SI86S640EE-AS2R

Overview

SI86S640EE-AS2R 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 WB SOIC-16 package. It operates from 2.25–5.5 V supplies and is AEC-Q100 qualified for automotive battery management systems.

For engineers reviewing the SI86S640EE-AS2R datasheet, SI86S640EE-AS2R pinout, SI86S640EE-AS2R application, or SI86S640EE-AS2R equivalent, key selection criteria include its reinforced IEC 60747-17 rating, fail-safe default-low output mode (indicated by "E" suffix), 36 ns input deglitch filter, and compatibility with isolated SPI peripheral interfaces in high-noise motor control and onboard charger designs.

Technical Context

The SI86S640EE-AS2R implements RF-based on/off keying modulation across a monolithic semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity. Its four independent channels support configurable directionality via external enable pins (EN1/EN2) and feature Schmitt-trigger + CMOS threshold inputs for enhanced EMI rejection.

It integrates undervoltage lockout (UVLO) with 2.10–2.25 V rising threshold per side, reset detection at ~1.7 V, and a 100 kΩ weak pulldown during unpowered states. The device supports fail-safe operation where outputs default to logic low when VDD1 is unpowered but VDD2 remains active-confirmed by the "E" ordering code.

Key Specifications

Pinout & Package

SI86S640EE-AS2R is housed in a wide-body SOIC-16 (WB SOIC-16) package with creepage/clearance ≥8.3 mm, rated for 6000 VRMS isolation per UL 1577. Pin assignments follow Figure 2 of the datasheet for Si86S64x/L4x devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM4402ARWZ and ISO6741FDWR, SI86S640EE-AS2R offers superior high-speed performance (150 Mbps), higher isolation (6000 VRMS), built-in 36 ns deglitching, and automotive-grade fail-safe behavior-making it optimal for EV traction inverters and OBCs requiring functional safety assurance.

Availability

SI86S640EE-AS2R is available at Aetrix Electronics and suitable for battery management systems, onboard chargers, and motor control applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for SI86S640EE-AS2R 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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-reliability applications.

The Si86S6xx family was designed specifically for automotive and industrial systems demanding reinforced isolation, high CMTI, and fail-safe behavior-including traction inverters, BMS, and isolated power supplies.

FAQ

What does the "E" in SI86S640EE-AS2R indicate?

The "E" suffix in SI86S640EE-AS2R specifies the fail-safe output configuration where outputs default to logic low when the input-side supply (VDD1) is unpowered but the output-side supply (VDD2) remains active. This behavior is confirmed in Table 4 of the datasheet and ensures safe shutdown of downstream gate drivers or protection circuits during primary-side power loss-critical for automotive battery management and traction inverter safety.

Does SI86S640EE-AS2R support SPI isolation?

Yes, SI86S640EE-AS2R supports isolated SPI communication through its four independent bidirectional channels. While not a dedicated SPI isolator like the Si86SSx series, it can implement full-duplex or half-duplex SPI interfaces by assigning A1/B1 for SCLK, A2/B2 for MOSI/MISO, and A3/B3 for CS-leveraging its 150 Mbps data rate and 10 ns propagation delay to maintain timing integrity across the isolation barrier.

What is the purpose of the 36 ns input deglitch filter in SI86S640EE-AS2R?

The 36 ns input deglitch filter in SI86S640EE-AS2R removes narrow noise pulses-such as those induced by SiC/GaN switching transients or ESD events-that are shorter than 36 ns. This prevents false triggering of isolated logic signals while preserving valid data edges, directly improving system robustness in high-dV/dt environments like motor drives and onboard chargers without adding external RC filtering.

Is SI86S640EE-AS2R compatible with 3.3 V and 5 V logic levels?

Yes, SI86S640EE-AS2R operates across a 2.25–5.5 V supply range on both sides and features CMOS-compatible input thresholds (VIH = 0.7×VDD, VIL = 0.3×VDD) plus Schmitt-trigger hysteresis. This allows seamless interfacing with 3.3 V microcontrollers and 5 V peripheral ICs without level shifters-verified across –40 °C to +125 °C ambient temperature per AEC-Q100 Grade 1 requirements.

How does the EN1 and EN2 pin function in SI86S640EE-AS2R?

EN1 and EN2 are active-high output enable pins controlling all outputs on Side A and Side B respectively. When pulled low, they place the corresponding side's outputs (A1–A4 or B1–B4) into high-impedance state-enabling shared bus architectures and synchronized power-down sequencing. Both pins accept standard CMOS logic levels and require no external pull-ups, simplifying integration into automotive and industrial control systems using SI86S640EE-AS2R.