Skyworks Solutions Inc. SI8641ED-AS

Overview

SI8641ED-AS from Skyworks is a quad-channel digital isolator with 3 input channels on VDD1 side and 1 output channel on VDD2 side, rated for 5.0 kVRMS reinforced isolation in wide-body SOIC-16 package. It supports DC–150 Mbps data rates, achieves <10 ns propagation delay, features Schmitt-trigger inputs, tri-state outputs with enable control, and selectable high-default fail-safe mode. It is used in isolated motor control gate drivers where high CMTI and precise timing ensure robust PWM signal integrity across isolation barriers.

For engineers reviewing the SI8641ED-AS datasheet, SI8641ED-AS pinout, SI8641ED-AS application, or SI8641ED-AS equivalent, this page delivers verified specifications, validated pin functions, automotive-grade AEC-Q100 qualification, and real-world use context for industrial and EV traction inverter designs requiring 5 kVRMS reinforced insulation and sub-10 ns timing precision.

Technical Context

The SI8641ED-AS implements RF-based on/off keying across a silicon-die isolation barrier, eliminating startup initialization and enabling immediate data transmission upon power-up. Its architecture provides inherent noise immunity via carrier modulation rather than pulse coding, supporting operation across –40°C to +125°C without parameter drift.

It features dual independent enable inputs (EN1 on VDD1 side, EN2 on VDD2 side) for selective channel control: EN1 governs output A4, while EN2 controls outputs B1–B3. The device maintains fail-safe default-high output during VDD1 loss while VDD2 remains powered, per ordering option "ED".

Key Specifications

Pinout & Package

SI8641ED-AS is housed in a RoHS-compliant wide-body SOIC-16 package (package code -IS/-AS), offering 8 mm creepage and reinforced insulation for 5 kVRMS rating. Pin assignments are validated per Skyworks datasheet Section 5 (Pin Descriptions) and Figure 5.1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM2401ARWZ and ISO6741QDWR, SI8641ED-AS uniquely combines AEC-Q100 qualification, 5 kVRMS reinforced isolation, 150 Mbps bandwidth, and sub-nanosecond skew-making it the only viable option for next-generation EV traction inverters demanding both safety and performance.

Availability

SI8641ED-AS is available at Aetrix Electronics and suitable for industrial motor drives, EV traction inverters, isolated ADC interfaces, and medical power supplies requiring stable component supply and long-term lifecycle support.

Supply support for SI8641ED-AS 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 Si864x family was designed specifically for high-reliability industrial and automotive isolation applications requiring reinforced safety ratings, ultra-low power, and precise timing-targeting motor control, battery management, and medical systems.

FAQ

What is the isolation rating and certification status of SI8641ED-AS?

SI8641ED-AS is rated for 5.0 kVRMS reinforced isolation and certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1 standards. It meets IEC 62368-1 and IEC 60601-1 for medical applications and carries AEC-Q100 Grade 1 qualification for automotive use. These certifications are explicitly listed for SI8641ED-AS in the Skyworks datasheet Table 1.1 and Safety Regulatory Approvals section.

How does the fail-safe mode operate on SI8641ED-AS?

SI8641ED-AS has a factory-configured high-default fail-safe mode ("ED" suffix). When VDD1 is unpowered but VDD2 remains active, outputs B1–B3 and A4 default to logic high. This behavior is confirmed in Table 3.1 (Si86xx Logic Operation) and Section 3.4 (Fail-Safe Operating Mode) of the datasheet, ensuring predictable shutdown in controller fault conditions.

What are the enable pin functions for SI8641ED-AS?

SI8641ED-AS has two enable pins: EN1 (on VDD1 side) controls output A4, and EN2 (on VDD2 side) controls outputs B1–B3. Both are active-high; pulling either low places its respective outputs in high-impedance state. This dual-enable architecture is documented in Table 3.2 (Enable Input Truth) and enables flexible channel gating in multi-phase systems.

Does SI8641ED-AS require external components for stable operation?

Yes - SI8641ED-AS requires a 0.1 µF ceramic bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2, placed adjacent to the pins. This is mandated in Section 3.3.1 (Supply Bypass) of the datasheet. No pull-up/down resistors are needed: Schmitt-trigger inputs and internal fail-safe biasing eliminate external passive components.

What is the maximum ambient temperature range for SI8641ED-AS?

SI8641ED-AS operates across –40°C to +125°C ambient temperature, validated per AEC-Q100 Grade 1 requirements. This range is specified in Table 4.1 (Recommended Operating Conditions) and applies under full 150 Mbps operation with proper PCB thermal design, as confirmed by Skyworks' thermal characterization in Section 3.5.