Skyworks Solutions Inc. SI8420BD-D-IS

Overview

SI8420BD-D-IS from Skyworks is a dual-channel, low-power digital isolator with 5 kV_RMS reinforced isolation, 150 Mbps data rate, and selectable fail-safe low default output. It operates from 2.70–5.5 V on both sides and delivers <3.7 mA/channel at 1 Mbps (2.70 V) and <9.8 mA/channel at 100 Mbps (5 V), enabling high-speed isolated communication in motor control and industrial power supplies.

For engineers reviewing the SI8420BD-D-IS datasheet, SI8420BD-D-IS pinout, SI8420BD-D-IS application, or SI8420BD-D-IS equivalent, this page provides verified specifications, SOIC-16 wide-body package details, fail-safe mode behavior, propagation delay skew ≤1.5 ns, and real-world use cases in isolated ADC interfaces and IGBT gate drivers where precise timing and noise immunity are critical.

Technical Context

The SI8420BD-D-IS implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering robust noise immunity without optical degradation. Its dual-channel architecture supports independent bidirectional signal paths with Schmitt-trigger inputs and 45 kV/µs common-mode transient immunity.

It features AEC-Q100 qualification, –40 to +125 °C operation at full 150 Mbps, and failsafe logic that holds outputs low when VDD1 is unpowered while VDD2 remains active-enabling safe shutdown in isolated power domains.

Key Specifications

Pinout & Package

SI8420BD-D-IS is housed in a RoHS-compliant SOIC-16 wide-body package (WB SOIC-16), providing 8.3 mm creepage and clearance for reinforced 5 kV_RMS isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM120N0BRZ-RL7 and ISO7721DWR, SI8420BD-D-IS uniquely combines 5 kV reinforced isolation in SOIC-16, 150 Mbps speed, ≤0.5 ns channel skew, and AEC-Q100 qualification-making it optimal for high-reliability motor drives and medical power supplies where timing precision and safety certification are co-required.

Availability

SI8420BD-D-IS is available at Aetrix Electronics and suitable for industrial automation systems, medical electronics, and hybrid electric vehicles requiring stable component supply, long-term lifecycle support, and certified 5 kV reinforced isolation.

Supply support for SI8420BD-D-IS 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-performance wireless and wired infrastructure.

The Si84xx family was designed specifically for replacing optocouplers in demanding industrial, automotive, and medical applications-delivering superior speed, power efficiency, and long-term reliability without LED degradation.

FAQ

What is the maximum data rate supported by the SI8420BD-D-IS?

The SI8420BD-D-IS supports a maximum data rate of 150 Mbps under all operating conditions (2.70–5.5 V, –40 to +125 °C). This is confirmed in Table 5.2 of the official Skyworks datasheet for Si8420Bx variants, where "Maximum Data Rate" is specified as 150 Mbps with 6 ns minimum pulse width and 11 ns worst-case propagation delay. SI8420BD-D-IS is a B-grade (high-speed) variant, distinct from the 1 Mbps A-grade versions.

Does the SI8420BD-D-IS have fail-safe functionality, and what is its default state?

Yes, the SI8420BD-D-IS features a selectable fail-safe mode. Per the Ordering Guide and Table 4.1 in the datasheet, the "D" suffix denotes default low output when VDD1 is unpowered and VDD2 is active. This behavior ensures downstream circuits (e.g., IGBT gates) remain de-energized during input-side power loss-a critical safety feature in motor control and power supply designs.

What package type and creepage distance does the SI8420BD-D-IS use?

The SI8420BD-D-IS uses a SOIC-16 wide-body (WB SOIC-16) package with 8.3 mm minimum creepage and clearance. This mechanical configuration satisfies reinforced insulation requirements for 5 kV_RMS isolation per UL 1577, VDE 0884-5, and IEC 60950-1, as documented in Tables 5.5 and 5.6 of the Skyworks datasheet.

Is the SI8420BD-D-IS qualified for automotive applications?

Yes, the SI8420BD-D-IS is AEC-Q100 qualified (Grade 1: –40 to +125 °C), as explicitly stated in Footnote 1 of the Ordering Guide and Section 1 Features List. This qualification covers stress testing for temperature cycling, humidity, and ESD-making it suitable for use in hybrid electric vehicle battery management and traction inverter subsystems.

How does the SI8420BD-D-IS achieve high noise immunity?

The SI8420BD-D-IS achieves high noise immunity through RF-based on/off keying modulation (not pulse-width or edge encoding), Schmitt-trigger inputs with 0.45 V hysteresis, and 45 kV/µs common-mode transient immunity (CMTI). These features are measured and guaranteed across temperature and voltage ranges per Table 5.2, enabling reliable operation in electrically noisy motor drives and switch-mode power supplies.