Skyworks Solutions Inc. SI8445BB-D-IS1R

Overview

SI8445BB-D-IS1R from Skyworks Solutions is a quad-channel digital isolator with reinforced isolation rated at 2500 VRMS, supporting up to 150 Mbps data rate, worst-case propagation delay <9.5 ns, and ultra-low power consumption (<3.8 mA per channel at 100 Mbps, 5 V). It operates across –40 to +125 °C and is used in isolated ADC/DAC interfaces and motor control gate drivers where high CMTI (>25 kV/µs) and precise timing are critical.

For engineers reviewing the SI8445BB-D-IS1R datasheet, SI8445BB-D-IS1R pinout, SI8445BB-D-IS1R application, or SI8445BB-D-IS1R equivalent, key selection factors include its 16-pin wide-body SOIC package, 2.7–5.5 V dual-supply operation, enable-controlled tri-state outputs, and AEC-Q100 qualification for automotive subsystems requiring robust galvanic isolation.

Technical Context

The SI8445BB-D-IS1R implements capacitive isolation with on-chip RF modulation/demodulation circuitry, enabling DC-to-150 Mbps signal transmission without start-up initialization. Its architecture delivers <1.5 ns pulse width distortion and <0.5 ns channel-channel skew under 5 V operation, ensuring deterministic timing in closed-loop motor control and isolated feedback paths.

It features independent enable inputs per side (EN1/EN2), allowing dynamic output disable with 5–8 ns enable-to-data-valid latency. The device supports dual supply domains (VDD1/VDD2), each configurable from 2.70–5.5 V, and maintains stable performance across temperature due to CMOS-based process compensation.

Key Specifications

Pinout & Package

SI8445BB-D-IS1R is housed in a 16-pin wide-body SOIC package (package width 10.3 mm, creepage/clearance ≥8.0 mm), optimized for high-voltage isolation integrity and PCB-level creepage compliance in industrial and automotive designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM140D0BRWZ and ISO6741QDWR, the SI8445BB-D-IS1R uniquely combines AEC-Q100 qualification, 150 Mbps speed, and ultra-low power at high data rates-making it optimal for automotive and high-performance industrial isolator applications where timing precision and thermal robustness are non-negotiable.

Availability

SI8445BB-D-IS1R 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 SI8445BB-D-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 galvanic isolation in automotive, industrial, and energy infrastructure applications-emphasizing low power, high speed, and safety certification compliance over legacy optocoupler alternatives.

FAQ

What is the maximum data rate supported by the SI8445BB-D-IS1R?

The SI8445BB-D-IS1R supports a maximum data rate of 150 Mbps across all four channels, verified under worst-case conditions (–40 to +125 °C, 5 V supply, 15 pF load). This capability enables high-speed isolated communication for SPI, RS-485 control, and real-time PWM feedback in motor drives. The SI8445BB-D-IS1R achieves this without compromising propagation delay or skew specifications.

Does the SI8445BB-D-IS1R require external startup initialization?

No, the SI8445BB-D-IS1R does not require external startup initialization. It begins transmitting valid data within 15–40 µs after power application (start-up time tSU), with no configuration sequence needed. This zero-initialization behavior simplifies system design and improves reliability in safety-critical applications such as automotive BMS and industrial PLCs where deterministic boot behavior is essential. The SI8445BB-D-IS1R delivers immediate functional isolation upon power-up.

What isolation voltage rating does the SI8445BB-D-IS1R have, and which safety standards does it meet?

The SI8445BB-D-IS1R is rated for 2500 VRMS isolation (1 minute), tested to 3000 VRMS for production screening. It is certified to UL 1577 (File E257455), CSA Component Notice 5A (File 232873), and VDE 0884-2 / IEC 60747-5-2 (File 5006301-4880-0001). These certifications validate its use in reinforced insulation applications up to 600 VRMS working voltage per IEC 60664-1. The SI8445BB-D-IS1R meets all three major regional safety standards without derating.

How does the SI8445BB-D-IS1R manage power consumption at high data rates?

At 100 Mbps and 5 V supply, the SI8445BB-D-IS1R draws ≤3.8 mA per channel (typical), totaling ≤15.2 mA for all four channels. At 2.7 V, consumption drops to ≤3.6 mA per channel. This ultra-low power is achieved via optimized RF modulation and low-capacitance internal barriers. The SI8445BB-D-IS1R reduces isolation-related power by up to 60% versus competing devices at equivalent speeds-critical for thermally constrained automotive and portable industrial systems.

Is the SI8445BB-D-IS1R pin-compatible with other members of the Si844x family?

Yes, the SI8445BB-D-IS1R shares identical pinout and package (16-pin wide-body SOIC) with all Si8440/41/42/45 variants, including Si8445AB-D-IS1R and Si8445CB-D-IS1R. Differences lie solely in data rate grade (B = 150 Mbps, A = 1 Mbps, C = 25 Mbps) and enable functionality-no PCB layout change is required when upgrading within the same package variant. The SI8445BB-D-IS1R maintains full mechanical and electrical compatibility across the Si844x family's wide-body SOIC offerings.