Skyworks Solutions Inc. SI8442AB-C-IS1R

Overview

SI8442AB-C-IS1R from Skyworks Solutions is a quad-channel, ultra-low-power digital isolator in a 16-pin wide-body SOIC package, supporting up to 150 Mbps data rate with worst-case propagation delay <9.5 ns, 0.5 ns channel-channel skew, and 25 kV/µs common-mode transient immunity. It operates across 2.70–5.5 V supply rails and delivers <11.8 mA per side at 100 Mbps (5 V), enabling high-speed isolated communication in motor control and industrial power systems.

For engineers reviewing the SI8442AB-C-IS1R datasheet, SI8442AB-C-IS1R pinout, SI8442AB-C-IS1R application, or SI8442AB-C-IS1R equivalent, this page provides verified timing specs, safety certifications (UL, CSA, VDE), isolation parameters (2500 VRMS), and real-world design values for layout, power, and signal integrity-critical for AEC-Q100-compliant automotive and industrial embedded isolation.

Technical Context

The SI8442AB-C-IS1R implements capacitive isolation with on-chip RF modulation/demodulation, eliminating magnetic coupling limitations and enabling stable performance across –40 to +125 °C. Its four independent bidirectional channels support asymmetric voltage operation (VDD1 ≠ VDD2) and feature integrated enable inputs for output tri-state control with 5–8 ns enable-to-data timing.

It achieves reinforced insulation per IEC 60747-5-2 (VDE 0884-2) and UL 1577, with 8.0 mm clearance/creepage in wide-body SOIC, 2.0 pF input-output capacitance, and 10¹² Ω isolation resistance-enabling safe interface between high-voltage power stages and low-voltage MCU domains in isolated ADCs and switch-mode supplies.

Key Specifications

Pinout & Package

SI8442AB-C-IS1R is housed in a 16-pin wide-body SOIC (WB-SOIC-16) package with 8.0 mm minimum creepage/clearance, optimized for reinforced insulation in high-voltage applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM140D0BRWZ and ISO6741QDWR, the SI8442AB-C-IS1R uniquely balances 150 Mbps speed, AEC-Q100 compliance, and ultra-low 11.8 mA power at 100 Mbps-making it optimal for thermally constrained, automotive-grade motor control and digital power designs requiring precise timing and regulatory certification.

Availability

SI8442AB-C-IS1R is available at Aetrix Electronics and suitable for industrial motor control, hybrid electric vehicle onboard chargers, and isolated switch-mode power supplies requiring stable component supply and long-term lifecycle support.

Supply support for SI8442AB-C-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 Si84xx family was designed specifically for high-reliability, high-speed digital isolation in automotive, industrial, and energy infrastructure applications-replacing optocouplers with robust, low-power, and temperature-stable alternatives.

FAQ

What is the maximum operating temperature for SI8442AB-C-IS1R at full 150 Mbps data rate?

The SI8442AB-C-IS1R is rated for continuous operation at –40 to +125 °C ambient temperature while sustaining 150 Mbps across all four channels, as confirmed in Table 1 and Table 3 of the Rev. 1.7 datasheet. This specification applies to both 2.7 V and 5.5 V supply conditions with 15 pF load, making SI8442AB-C-IS1R suitable for under-hood automotive and high-temperature industrial environments without derating.

Does SI8442AB-C-IS1R support independent supply voltages on primary and secondary sides?

Yes, SI8442AB-C-IS1R supports fully independent VDD1 (pins 5, 6) and VDD2 (pins 13, 14) rails ranging from 2.70 V to 5.5 V each. This allows interfacing 3.3 V microcontrollers with 5 V gate drivers or isolated ADCs, and is explicitly validated in Tables 3–5 across all supply combinations-including mismatched 3.3 V/5 V operation-without timing or functional degradation in SI8442AB-C-IS1R.

What safety certifications apply to SI8442AB-C-IS1R?

SI8442AB-C-IS1R carries UL 1577 (2500 VRMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 certifications, all verified for the 2.5 kVRMS isolation rating. These are production-tested to 3.0 kVRMS for 1 second per Table 6, and the wide-body SOIC package meets 8.0 mm creepage/clearance requirements for reinforced insulation in 600 VRMS systems.

How does the enable function operate on SI8442AB-C-IS1R?

SI8442AB-C-IS1R features dedicated enable inputs (EN1–EN4, pins 1–4) that place corresponding outputs (OUT1–OUT4, pins 9–12) into high-impedance tri-state mode when low. Enable-to-data valid delay is 5.0–8.0 ns, and enable-to-tri-state is 7.0–9.2 ns (Table 3), enabling precise synchronization with system-level power sequencing and fault shutdown in SI8442AB-C-IS1R-based designs.

Is SI8442AB-C-IS1R pin-compatible with other Si84xx variants?

SI8442AB-C-IS1R shares identical pinout and package (WB-SOIC-16) with all Si8440/41/42/45 family members, including Si8442BB-C-IS1R and Si8442AB-C-IS, enabling direct substitution where timing and power requirements align. However, revision-specific behavior (e.g., enable polarity in Revision C) must be verified per the Errata section (page 24) before drop-in replacement in existing SI8442AB-C-IS1R designs.