Skyworks Solutions Inc. SI8445BA-C-IS1

Overview

SI8445BA-C-IS1 from Skyworks Solutions is a quad-channel digital isolator with reinforced isolation rated at 2500 VRMS, supporting up to 150 Mbps data rate and worst-case propagation delay under 9.5 ns. It operates across 2.70–5.5 V supply rails on both sides, delivers ultra-low power consumption (e.g., <3.8 mA per channel at 100 Mbps, 5 V), and targets high-noise industrial motor control and isolated ADC/DAC interfaces.

For engineers reviewing the SI8445BA-C-IS1 datasheet, SI8445BA-C-IS1 pinout, SI8445BA-C-IS1 application, or SI8445BA-C-IS1 equivalent, key selection criteria include its 150 Mbps capability, 0.5 ns typical channel-to-channel skew, 25 kV/µs CMTI, SOIC-16 wide-body package, and AEC-Q100 qualification for automotive subsystems requiring robust galvanic separation.

Technical Context

The SI8445BA-C-IS1 implements capacitive isolation with differential RF signaling across four independent bidirectional channels, enabling DC-to-150 Mbps operation without start-up initialization. Its dual-supply architecture supports asymmetric voltage operation (e.g., 3.3 V on side 1, 5 V on side 2) while maintaining precise timing: pulse width distortion ≤2.5 ns and propagation delay skew ≤3.0 ns (P-P).

It integrates enable-controlled output tri-state functionality with ten1 ≤8.0 ns enable-to-data-valid latency and meets reinforced insulation requirements per UL 1577 (2500 VRMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE 0884-2 (IEC 60747-5-2), validated for 60-year lifetime at rated working voltage.

Key Specifications

Pinout & Package

SI8445BA-C-IS1 is housed in a 16-pin wide-body SOIC package (package outline per Skyworks Doc Rev. 1.7, page 28), providing 8.0 mm minimum creepage and clearance for reinforced insulation compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM140D0BRWZ and ISO6741QDWR, the SI8445BA-C-IS1 uniquely balances 150 Mbps speed, AEC-Q100 qualification, and ultra-low 3.8 mA/channel dynamic power at 100 Mbps-making it optimal for thermally constrained, automotive-grade motor control and isolated ADC interfaces where timing precision and reliability are critical.

Availability

SI8445BA-C-IS1 is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management systems, and isolated switch-mode power supplies requiring stable component supply and long-term lifecycle support.

Supply support for SI8445BA-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 Si84xx family was designed specifically for high-reliability galvanic isolation in demanding industrial and automotive environments, emphasizing low power, precise timing, and regulatory compliance over legacy optocoupler alternatives.

FAQ

What is the maximum data rate supported by the SI8445BA-C-IS1?

The SI8445BA-C-IS1 supports a maximum data rate of 150 Mbps across all four channels. This specification is guaranteed under recommended operating conditions (VDD = 2.70–5.5 V, TA = –40 to +125 °C, CL = 15 pF), and applies to both narrow- and wide-body SOIC packages per Skyworks Rev. 1.7 datasheet Table 3. The SI8445BA-C-IS1 achieves this performance using capacitive isolation with differential RF encoding, enabling reliable high-speed serial communication in motor control and isolated ADC interfaces.

Does the SI8445BA-C-IS1 require external components for basic operation?

No, the SI8445BA-C-IS1 requires only VDD bypass capacitors-typically 0.1 µF ceramic capacitors placed close to each VDD pin-to operate correctly. Unlike optocouplers or transformer-based isolators, it needs no external resistors, pull-ups, or timing components. The SI8445BA-C-IS1 features integrated drivers and receivers, eliminating external termination requirements except in controlled-impedance PCB layouts where 85 Ω output impedance may necessitate matched trace design.

What safety certifications apply to the SI8445BA-C-IS1?

The SI8445BA-C-IS1 is certified to UL 1577 (2500 VRMS, 1 minute), CSA Component Notice 5A (IEC 60950-1 and IEC 61010-1), and VDE 0884-2 (IEC 60747-5-2). These certifications validate its reinforced insulation capability and 60-year lifetime at rated working voltage. All certifications apply to the 2.5 kVRMS-rated SI8445BA-C-IS1 variant and are production-tested to 3.0 kVRMS for 1 second per Skyworks documentation.

Is the SI8445BA-C-IS1 pin-compatible with other devices in the Si84xx family?

Yes, the SI8445BA-C-IS1 shares identical pinout and package (SOIC-16 wide-body) with all Si8440/41/42/45 variants, including Si8445BB-C-IS1 and Si8445BC-C-IS1. Differences between variants lie in data rate grade (e.g., 1.0 Mbps vs. 150 Mbps), enable configuration, and temperature grading-not physical layout. This allows drop-in replacement within the same speed grade and revision (Revision C), simplifying design reuse and BOM rationalization.

What is the typical power consumption of the SI8445BA-C-IS1 at 100 Mbps?

At 100 Mbps, 5 V supply, and 15 pF load, the SI8445BA-C-IS1 consumes ≤5.7 mA per channel on VDD1 and ≤24.3 mA per channel on VDD2 (worst-case, Table 3). Typical consumption is lower: 3.8 mA/VDD1 and 19.4 mA/VDD2 per channel. This ultra-low dynamic power enables high-density isolation in thermally constrained applications such as automotive traction inverters and compact industrial drives where the SI8445BA-C-IS1 is commonly deployed.