Skyworks Solutions Inc. SI8641BD-B-IS2R

Overview

SI8641BD-B-IS2R 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 (IS2) package. It supports DC–150 Mbps data rates, achieves <10 ns propagation delay, features Schmitt-trigger inputs, tri-state outputs with independent enable control, and operates across –40 to 125 °C for industrial motor control and isolated power supply feedback loops.

For engineers reviewing the SI8641BD-B-IS2R datasheet, SI8641BD-B-IS2R pinout, SI8641BD-B-IS2R application, or SI8641BD-B-IS2R equivalent, key selection criteria include its 5.0 kVRMS reinforced insulation rating, fail-safe low-default output state, 2.5–5.5 V dual-supply operation, and compatibility with high-noise industrial bus interfaces requiring precise timing and ultra-low power at 100 Mbps.

Technical Context

The SI8641BD-B-IS2R implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering superior CMTI (≥50 kV/µs) versus optocouplers. Its architecture supports independent enable control per side (EN1 for A4, EN2 for B1–B3), enabling selective channel gating without affecting adjacent channels.

It integrates undervoltage lockout (UVLO) on both sides (VDDUV+ = 2.24 V typ), ensures stable timing over temperature (propagation delay skew ≤ 2 ns), and maintains fail-safe default-low output during VDD1 loss while VDD2 remains powered-critical for safe shutdown sequencing in inverters and battery management systems.

Key Specifications

Pinout & Package

SI8641BD-B-IS2R uses a RoHS-compliant wide-body SOIC-16 package (IS2 variant) with 8 mm creepage, eliminating tie bars while retaining standard land pattern and 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM2401ARWZ and ISO6741QDWR, SI8641BD-B-IS2R delivers 3× higher data rate, 2× higher CMTI, and factory-programmed fail-safe default-making it optimal for next-generation motor drives and automotive BMS requiring deterministic safety states and high-speed telemetry.

Availability

SI8641BD-B-IS2R is available at Aetrix Electronics and suitable for industrial motor control, isolated ADC/DAC interfaces, and battery management systems requiring stable component supply, long-term lifecycle support, and certified 5.0 kVRMS reinforced isolation.

Supply support for SI8641BD-B-IS2R 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 provider of analog semiconductors specializing in RF, timing, and isolation technologies, with design centers and manufacturing facilities across Asia and the US.

The Si864x family was engineered specifically for high-reliability industrial and automotive isolation applications demanding extended temperature operation, reinforced safety certification, and ultra-low power at multi-Mbps data rates.

FAQ

What is the isolation rating and safety certification of SI8641BD-B-IS2R?

SI8641BD-B-IS2R is rated for 5.0 kVRMS reinforced isolation and certified to UL 1577, CSA Component Notice 5A, VDE 0884-10 (reinforced), IEC 62368-1, and GB4943.1. Its IS2 package provides 8 mm creepage distance, meeting stringent requirements for industrial and medical end-equipment safety standards.

How does the fail-safe mode function in SI8641BD-B-IS2R?

In SI8641BD-B-IS2R, the fail-safe mode is factory-configured to default low on all outputs when VDD1 is unpowered but VDD2 remains active. This ensures downstream circuits (e.g., gate drivers) enter a known safe state during controller power loss-critical for preventing hazardous conditions in motor inverters and power supplies.

What are the enable pin functions for SI8641BD-B-IS2R?

SI8641BD-B-IS2R has two enable pins: EN1 controls output A4 (VDD1 side), and EN2 controls outputs B1–B3 (VDD2 side). When asserted high, each enables its respective channel group; when low, it places those outputs in high-impedance state-enabling flexible signal multiplexing and power-gating without external logic.

Does SI8641BD-B-IS2R require external bypass capacitors?

Yes, SI8641BD-B-IS2R requires a 0.1 µF ceramic bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2. These must be placed as close as possible to the respective power pins to suppress high-frequency noise and ensure stable operation at 150 Mbps data rates.

What is the operating temperature range and automotive qualification status of SI8641BD-B-IS2R?

SI8641BD-B-IS2R operates from –40 to 125 °C and is qualified to AEC-Q100 Grade 1. Though the part number suffix indicates industrial grade (–I), its electrical specs, thermal performance, and process flow meet automotive reliability requirements-including zero-defect methodology and AIAG-compliant PPAP documentation support.