Skyworks Solutions Inc. SI8442BA-C-IS1

Overview

SI8442BA-C-IS1 from Skyworks Solutions is a quad-channel digital isolator with reinforced isolation, rated for 2500 VRMS withstand voltage and supporting up to 150 Mbps data rate. It operates across 2.70–5.5 V supply rails on both sides, delivers worst-case propagation delay under 9.5 ns, and targets high-noise industrial and automotive subsystems requiring precise timing and robust common-mode transient immunity (25 kV/µs).

For engineers reviewing the SI8442BA-C-IS1 datasheet, SI8442BA-C-IS1 pinout, SI8442BA-C-IS1 application, or SI8442BA-C-IS1 equivalent, key selection criteria include its 4-channel unidirectional configuration, SOIC-16 wide-body package, AEC-Q100 qualification, and verified performance at –40 to 125 °C over full data rates.

Technical Context

The SI8442BA-C-IS1 implements capacitive isolation with on-chip RF modulation/demodulation circuitry, enabling DC-to-150 Mbps signal transmission without start-up initialization. Its dual-supply architecture supports independent 2.70–5.5 V operation on primary and secondary sides, with channel-to-channel skew as low as 0.5 ns and pulse width distortion limited to 1.5 ns typical.

It integrates enable-controlled output tri-state functionality (ten1 ≤ 8.0 ns, ten2 ≤ 9.2 ns), supports 15 pF load drive with 85 Ω nominal output impedance, and maintains stable timing parameters across temperature due to CMOS-based process consistency - critical for motor control gate drivers and isolated ADC interfaces.

Key Specifications

Pinout & Package

SI8442BA-C-IS1 is housed in a 16-pin wide-body SOIC package (WB SOIC-16) with 8.0 mm creepage and clearance, optimized for high-voltage isolation integrity. Pin assignments follow standard Si844x quad-channel layout with independent input/output pairs and dedicated enable control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM140D0BRWZ and ISO6741QDWR, the SI8442BA-C-IS1 offers the tightest channel skew (0.5 ns) and highest CMTI (25 kV/µs) among 2500 VRMS-rated quad isolators, making it optimal for time-critical motor control and fast-switching power conversion where timing fidelity is non-negotiable.

Availability

SI8442BA-C-IS1 is available at Aetrix Electronics and suitable for industrial motor control, automotive onboard chargers, isolated switch-mode power supplies, and precision data acquisition systems requiring stable component supply and long-lifecycle support.

Supply support for SI8442BA-C-IS1 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 Si844x family was designed specifically for high-reliability, high-speed digital isolation in harsh electromagnetic environments - targeting industrial automation, electric vehicle power systems, and isolated sensing applications.

FAQ

What is the maximum operating temperature for SI8442BA-C-IS1?

The SI8442BA-C-IS1 is rated for continuous operation from –40 to 125 °C ambient temperature at full 150 Mbps data rate and 2.70–5.5 V supply range. This specification is validated per AEC-Q100 Grade 1 requirements and applies to both wide-body SOIC package variants, ensuring suitability for under-hood automotive and high-temperature industrial environments where the SI8442BA-C-IS1 maintains stable timing and isolation integrity.

Does SI8442BA-C-IS1 support bidirectional communication?

No, the SI8442BA-C-IS1 is a unidirectional quad-channel isolator: channels 1–4 transmit signals only from primary (IN1–IN4) to secondary (OUT1–OUT4) side. Bidirectional operation requires separate forward and reverse channel pairing or alternative devices like the Si8440 series; the SI8442BA-C-IS1's fixed directionality simplifies design in asymmetric signal flow applications such as gate drive control and isolated feedback loops.

What is the meaning of "-C" in SI8442BA-C-IS1?

The "-C" suffix in SI8442BA-C-IS1 denotes Revision C silicon, which includes specific errata corrections documented in the datasheet - notably revised enable pin behavior causing outputs to go low upon enable deactivation (Revision C only), and updated power supply bypass capacitor recommendations. This revision is fully compatible with prior board layouts but requires adherence to updated layout guidelines for optimal noise immunity and startup reliability in the SI8442BA-C-IS1 implementation.

How does SI8442BA-C-IS1 achieve 25 kV/µs common-mode transient immunity?

The SI8442BA-C-IS1 achieves 25 kV/µs CMTI through differential capacitive isolation architecture with tightly matched internal transmitter/receiver paths and on-chip noise rejection circuitry. This performance is measured per JEDEC standards with VI = VDD or 0 V, and remains consistent across –40 to 125 °C - enabling reliable operation in high-dV/dt environments like IGBT and SiC MOSFET gate driver circuits where the SI8442BA-C-IS1 prevents false triggering during fast switching transitions.

Is SI8442BA-C-IS1 pin-compatible with other Si844x variants?

Yes, the SI8442BA-C-IS1 shares identical pinout and package (SOIC-16 wide-body) with all Si8440/41/42/45 family members, including SI8442BB-C-IS1 and SI8442AB-C-IS1. Differences lie in data rate grade (A = 1 Mbps, B = 150 Mbps), channel direction (A/B = unidirectional, C/D = bidirectional), and enable logic - so direct substitution is possible only when matching speed, direction, and enable behavior; the SI8442BA-C-IS1 must be used where 150 Mbps unidirectional isolation is required.