Skyworks Solutions Inc. SI86S640EC-IS1R

Overview

SI86S640EC-IS1R from Skyworks Solutions is a 4-channel reinforced digital isolator with bidirectional signal isolation across an integrated semiconductor barrier. It delivers DC–150 Mbps data rate, 10 ns typical propagation delay, and 6000 VRMS isolation rating in a WB SOIC-16 package. It operates from 2.25–5.5 V supplies on both sides and supports fail-safe default-high output mode for industrial motor control and isolated ADC interfaces.

For engineers reviewing the SI86S640EC-IS1R datasheet, SI86S640EC-IS1R pinout, SI86S640EC-IS1R application, or SI86S640EC-IS1R equivalent, key selection criteria include reinforced IEC 60747-17 certification, AEC-Q100 qualification, 100 kV/µs CMTI, tri-state output enable, and Schmitt-trigger + CMOS input thresholds for high-noise environments.

Technical Context

The SI86S640EC-IS1R implements RF-based on/off keying modulation across its isolation barrier-replacing legacy optocoupler architectures with superior noise immunity, no start-up initialization, and stable timing under voltage transients. Each channel integrates independent transmitter (HF XMTR) and receiver (HF RCVR) circuits with internal RF oscillator and demodulator.

It features dual-side undervoltage lockout (UVLO+ = 2.18 V, UVLO– = 2.05 V), reset detection at ~1.7 V (RSTB), and configurable fail-safe output state during unpowered conditions. The device supports simultaneous operation of all four channels with side-specific enable pins (EN1/EN2) and maintains precise timing even at 125 °C ambient.

Key Specifications

Pinout & Package

SI86S640EC-IS1R is housed in a wide-body SOIC-16 (WB SOIC-16) 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 SI86S640EC-IS1R, ADUM4402ARWZ offers lower cost but lacks AEC-Q100 and 6000 VRMS rating, while ISO6741QDWR meets automotive requirements but trades speed and isolation margin for footprint and power efficiency.

Availability

SI86S640EC-IS1R is available at Aetrix Electronics and suitable for industrial motor control, onboard chargers, and traction inverter designs requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.

Supply support for SI86S640EC-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 was designed specifically for high-reliability industrial and automotive isolation needs-emphasizing reinforced safety certification, extreme temperature operation, and RF-based timing stability over legacy optocouplers.

FAQ

What is the isolation rating and safety certification status of SI86S640EC-IS1R?

SI86S640EC-IS1R provides 6000 VRMS isolation for 1 minute per UL 1577 and is certified to IEC 60747-17 (reinforced insulation). It also meets CSA 62368-1 and 60601-1, VDE 60747-17, and CQC GB4943.1 standards. These certifications are fully documented in Skyworks' safety file and apply directly to the SI86S640EC-IS1R part number in WB SOIC-16 packaging.

Does SI86S640EC-IS1R require external components for stable operation?

Yes, SI86S640EC-IS1R requires 0.1 µF and 10 µF bypass capacitors on both VDD1–GND1 and VDD2–GND2 pairs, placed as close as possible to the pins. No pull-up/down resistors are needed on inputs due to built-in Schmitt triggers and CMOS thresholds, but series termination (50–300 Ω) is recommended on noisy PCB traces to suppress reflections.

How does the fail-safe default-high mode function in SI86S640EC-IS1R during power loss?

In SI86S640EC-IS1R, the "EC" suffix denotes default-high fail-safe mode. When Side A (input side) loses power while Side B remains powered, all B1–B4 outputs drive high after UVLO release. This behavior is guaranteed by internal circuitry and verified per Table 4 in the datasheet, enabling safe fault signaling in motor control and power supply monitoring.

Can SI86S640EC-IS1R support bidirectional communication like SPI?

No-SI86S640EC-IS1R is a 4-channel unidirectional isolator (A1→B1, A2→B2, etc.). For SPI isolation, Skyworks offers dedicated parts like SI86SS41 or SI86SS51. SI86S640EC-IS1R is intended for forward-only signal paths such as PWM enable, fault flags, or status bits where directionality is fixed and timing-critical.

What is the maximum data rate and propagation delay specification for SI86S640EC-IS1R?

SI86S640EC-IS1R supports DC to 150 Mbps data rate with 10 ns typical propagation delay (measured from input 50% to output 50%). Pulse width distortion is 3.5 ns typical, and channel-to-channel skew is ≤2 ns. These values are specified at VDD = 5.0 V, TA = 25 °C, and apply across the full –40 to +125 °C operating range per datasheet Table 12.