Skyworks Solutions Inc. SI8642BT-IS2

Overview

SI8642BT-IS2 from Skyworks is a quad-channel digital isolator with 2 input/2 output channel configuration, 5 kVRMS reinforced isolation (VDE 0884-10), 150 Mbps data rate, and ultra-low power consumption (11 mA per side at 100 Mbps, 5 V). It operates across –40 to 125 °C and serves as a high-noise-immunity signal barrier in isolated gate drivers for industrial inverters.

For engineers reviewing the SI8642BT-IS2 datasheet, SI8642BT-IS2 pinout, SI8642BT-IS2 application, or SI8642BT-IS2 equivalent, key selection considerations include its WB SOIC-16 (IS2) package with 8 mm creepage, selectable fail-safe low default output, Schmitt-trigger inputs, and 50 kV/µs CMTI - critical for motor control and on-board charger designs requiring reinforced insulation and AEC-Q100-aligned robustness.

Technical Context

The SI8642BT-IS2 implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling deterministic timing without clock recovery circuitry. Its dual-enable architecture (EN1 on Side A, EN2 on Side B) supports independent tri-state control of two output pairs (A3/A4 and B1/B2).

It features reinforced VDE 0884-10 certification with 10 kV surge capability, 2.5–5.5 V dual-supply operation, and fail-safe logic that holds outputs low during VDD1 loss while VDD2 remains powered - a hardware-enforced safety behavior confirmed in Table 3.1 and Ordering Guide.

Key Specifications

Pinout & Package

SI8642BT-IS2 uses a 16-pin wide-body SOIC package (IS2 variant) with 8 mm creepage, standard WB SOIC land pattern, and tie-bar-free construction per Skyworks Package Outline Doc (Rev. 4, p.30–33).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM2402BRWZ and ISO7742FDWR, SI8642BT-IS2 uniquely delivers 150 Mbps speed, reinforced VDE 0884-10 + 10 kV surge, and guaranteed fail-safe low behavior - making it the only option qualified for AEC-Q100-aligned EV traction inverter gate drive and medical-grade isolated power supplies.

Availability

SI8642BT-IS2 is available at Aetrix Electronics and suitable for industrial inverters, on-board chargers, and isolated ADC interfaces requiring stable component supply across automotive and medical production lifecycles.

Supply support for SI8642BT-IS2 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 engineered for high-reliability isolation in harsh environments - targeting industrial automation, EV powertrain systems, and medical equipment where reinforced insulation, AEC-Q100 alignment, and sub-10 ns timing are mandatory.

FAQ

What is the isolation rating and certification status of SI8642BT-IS2?

SI8642BT-IS2 provides 5000 VRMS reinforced isolation certified to VDE 0884-10 with 10 kV surge capability. It meets UL 1577, CSA 5A, IEC 62368-1, and IEC 60601-1 reinforced insulation requirements. The IS2 package enables 8 mm creepage in standard WB SOIC footprint - verified in Skyworks Package Outline Doc (p.30–33).

Does SI8642BT-IS2 support fail-safe operation, and how is it implemented?

Yes, SI8642BT-IS2 implements hardware-enforced fail-safe behavior: when VDD1 is lost while VDD2 remains powered, outputs A3 and A4 default to logic low. This is an ordering-option feature confirmed in Table 3.1 and the Ordering Guide - no external components or firmware intervention required.

What are the enable pin functions on SI8642BT-IS2, and how do they differ from other Si864x variants?

SI8642BT-IS2 has EN1 controlling outputs A3/A4 and EN2 controlling outputs B1/B2 - enabling independent tri-state control of both output pairs. Unlike Si8640 (single EN) or Si8645 (no EN), this dual-enable structure supports asymmetric signal gating in bidirectional isolated buses, as defined in Table 3.2.

How does SI8642BT-IS2 achieve ultra-low power at 100 Mbps, and what is the typical current draw?

SI8642BT-IS2 draws 11 mA per side (VDD1 and VDD2) at 100 Mbps and 5 V, per Table 4.2. This efficiency stems from its RF on/off keying architecture - eliminating power-hungry PLLs or data recovery circuits - and optimized CMOS process, reducing dynamic switching losses versus capacitive or magnetic isolators.

Is SI8642BT-IS2 suitable for automotive applications, and what qualifications does it hold?

SI8642BT-IS2 is not an automotive-grade part (lacks "-A" suffix); it is industrial-grade (-I suffix). However, it shares identical electrical specs and construction with automotive variants (e.g., SI8642BT-AS) and is AEC-Q100-aligned in architecture. For production automotive use, SI8642BT-AS must be selected to obtain PPAP documentation and IMDS/CAMDS compliance.