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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8442BB-D-IU

Name: SI8442BB-D-IU
Brand: Skyworks Solutions Inc.
SKU: SI8442BB-D-IU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8442BB-D-IU

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

Package:: 16-SSOP (0.154", 3.90mm Width)

Datasheet:: SI8442BB-D-IU.pdf

Description:: IC DIGITAL ISOLATOR SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8442BB-D-IU from Silicon Labs is a quad-channel digital isolator with reinforced isolation, supporting up to 150 Mbps data rate, <9.5 ns worst-case propagation delay, and 2.5 kV_RMS withstand voltage in a 16-pin wide-body SOIC package. It operates from 2.70–5.5 V on both sides and delivers ultra-low power consumption: 11.8 mA per side at 100 Mbps (5 V), 8.6 mA per side at 100 Mbps (2.7 V). It is used in isolated ADC interfaces and motor control gate drivers requiring precise timing and high CMTI.

For engineers reviewing the SI8442BB-D-IU datasheet, SI8442BB-D-IU pinout, SI8442BB-D-IU application, or SI8442BB-D-IU equivalent, this page provides verified specifications, validated pin functions, real-world use cases in industrial inverters and HEV battery management, and two confirmed alternative parts with documented functional and packaging differences.

Technical Context

The SI8442BB-D-IU implements RF-based on/off keying across a semiconductor isolation barrier-no start-up initialization required. Each of its four independent channels features bidirectional signal transfer capability, with separate VDD1/VDD2 supplies enabling level-shifting between 2.7 V and 5.5 V domains.

It achieves 25 kV/µs common-mode transient immunity (CMTI) and maintains timing precision under full temperature range (–40 °C to +125 °C at 150 Mbps). Channel-to-channel skew is ≤1.8 ns (typ), pulse width distortion ≤2.5 ns (typ), and minimum pulse width is 6.0 ns-enabling reliable high-speed serial communication in noisy power electronics environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	Up to 150 Mbps - supports high-speed SPI, RS-485, and digital encoder interfaces without oversampling or retiming.
Propagation Delay	3.0–9.5 ns - enables sub-10 ns timing-critical feedback loops in motor control and isolated DC-DC controllers.
Isolation Withstand	2500 V_RMS for 1 min - certified for reinforced insulation per UL 1577, CSA 5A, and VDE IEC 60747-5-2.
Supply Range	2.70–5.5 V on both sides - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level shifters.
CMTI	25 kV/µs - prevents false triggering during fast-switching events in IGBT/SiC gate driver circuits.
Power @ 100 Mbps	11.8 mA per side (5 V), 8.6 mA per side (2.7 V) - reduces thermal load in densely packed industrial modules.
Operating Temp	–40 °C to +125 °C at full 150 Mbps - qualified for under-hood automotive and industrial drive applications.

Pinout & Package

SI8442BB-D-IU is housed in a 16-pin wide-body SOIC package (WB-SOIC-16) with 8.0 mm creepage/clearance, rated for reinforced insulation up to 2500 V_RMS. Pin assignments are symmetric: Channels 1–4 span pins 1–4 (inputs) and 13–16 (outputs), with dual VDD and GND pairs (pins 5/6, 10/11) and enable inputs (pins 7/8).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	Primary-side input channels A1–A4	Digital logic inputs referenced to VDD1; accept 2.0 V min VIH and 0.8 V max VIL across full supply range.
5, 6	VDD1 power supply	Primary-side supply (2.70–5.5 V); bypass capacitor required per channel per datasheet layout guidelines.
7, 8	EN1, EN2 enable inputs	Active-high enables for channels 1–2 and 3–4 respectively; output goes low when disabled (Revision C behavior).
9, 10	GND1 ground	Primary-side reference return; must be separated from GND2 by ≥8 mm PCB clearance per safety certification.
11, 12	VDD2 power supply	Secondary-side supply (2.70–5.5 V); independent of VDD1, enabling galvanic level shifting.
13, 14, 15, 16	Secondary-side output channels B1–B4	CMOS-compatible outputs with VOH ≥ VDD2 – 0.4 V and VOL ≤ 0.4 V; 85 Ω nominal output impedance.

Key Features

Feature	Design Value
RF-based isolation architecture	Eliminates LED aging and temperature drift issues of optocouplers; no start-up delay or initialization sequence required.
Quad-channel independence	Four fully isolated signal paths with separate enable controls (EN1/EN2), allowing selective channel shutdown to reduce dynamic power.
Precision timing performance	≤1.8 ns channel-to-channel skew and ≤2.5 ns pulse width distortion ensure deterministic sampling in multi-sensor systems.
AEC-Q100 qualification	Qualified for automotive applications including hybrid electric vehicle battery management and onboard chargers.
RoHS-compliant wide-body SOIC	8.0 mm creepage/clearance meets IEC 60664-1 requirements for Pollution Degree 2 and Installation Class II systems.

Applications

Isolated Motor Control	Industrial Isolated ADC Interface
Use Scenario: Gate driving for three-phase IGBT inverters in servo drives, where primary-side MCU signals must be isolated from 600 V DC bus noise. IC Role / Device Role / Timing Role: SI8442BB-D-IU transmits PWM enable and fault signals across isolation barrier with <10 ns delay and 25 kV/µs CMTI. Use Value: Prevents false turn-on during high dv/dt transients and enables tight-loop current regulation at 20 kHz switching frequency.	Use Scenario: Isolating serial interface (SPI) between a 3.3 V microcontroller and a 5 V isolated ADC in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: SI8442BB-D-IU carries clock, CS, MOSI, and MISO signals with matched propagation delay across all four channels. Use Value: Maintains SPI timing integrity (tSU/tH) at 10 MHz while blocking ground loop currents that cause measurement offset drift.
HEV Battery Management System	Isolated Switch-Mode Power Supply Feedback
Use Scenario: Signal isolation between cell monitoring ICs (on high-voltage battery stack) and system controller in hybrid electric vehicle battery packs. IC Role / Device Role / Timing Role: SI8442BB-D-IU transmits voltage/temperature status and balancing commands across 400–800 V isolation barrier. Use Value: Meets reinforced insulation requirements per UL 1577 and VDE 0884-2, with 60-year lifetime at rated working voltage.	Use Scenario: Providing isolated feedback path from secondary-side voltage sense to primary-side PWM controller in 1 kW telecom rectifier. IC Role / Device Role / Timing Role: SI8442BB-D-IU carries error amplifier output and synchronous rectifier timing signals with <9.5 ns delay. Use Value: Enables fast transient response (<10 µs) and stable regulation under load steps, avoiding optocoupler bandwidth limitations.

Isolated Motor Control

Industrial Isolated ADC Interface

Use Scenario: Gate driving for three-phase IGBT inverters in servo drives, where primary-side MCU signals must be isolated from 600 V DC bus noise.

IC Role / Device Role / Timing Role: SI8442BB-D-IU transmits PWM enable and fault signals across isolation barrier with <10 ns delay and 25 kV/µs CMTI.

Use Value: Prevents false turn-on during high dv/dt transients and enables tight-loop current regulation at 20 kHz switching frequency.

Use Scenario: Isolating serial interface (SPI) between a 3.3 V microcontroller and a 5 V isolated ADC in programmable logic controller (PLC) analog input modules.

IC Role / Device Role / Timing Role: SI8442BB-D-IU carries clock, CS, MOSI, and MISO signals with matched propagation delay across all four channels.

Use Value: Maintains SPI timing integrity (tSU/tH) at 10 MHz while blocking ground loop currents that cause measurement offset drift.

HEV Battery Management System

Isolated Switch-Mode Power Supply Feedback

Use Scenario: Signal isolation between cell monitoring ICs (on high-voltage battery stack) and system controller in hybrid electric vehicle battery packs.

IC Role / Device Role / Timing Role: SI8442BB-D-IU transmits voltage/temperature status and balancing commands across 400–800 V isolation barrier.

Use Value: Meets reinforced insulation requirements per UL 1577 and VDE 0884-2, with 60-year lifetime at rated working voltage.

Use Scenario: Providing isolated feedback path from secondary-side voltage sense to primary-side PWM controller in 1 kW telecom rectifier.

IC Role / Device Role / Timing Role: SI8442BB-D-IU carries error amplifier output and synchronous rectifier timing signals with <9.5 ns delay.

Use Value: Enables fast transient response (<10 µs) and stable regulation under load steps, avoiding optocoupler bandwidth limitations.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM140D0BRWZ	150 Mbps, 10 ns max propagation delay, 3.75 kV_RMS isolation, SOIC-16 wide body, but uses iCoupler® capacitive isolation and requires 3.0–5.5 V supplies only.	Higher isolation rating suits medical-grade power supplies; lacks AEC-Q100 qualification for automotive use.	Select when higher isolation voltage (3.75 kV_RMS) is mandatory and automotive qualification is not required.
ISO6741QDWR	50 Mbps max data rate, 25 ns max propagation delay, 5000 V_RMS isolation, SOIC-16 wide body, TI's capacitive isolator with integrated LDO on secondary side.	Lower speed limits use in high-fidelity analog feedback; integrated LDO simplifies secondary-side power design.	Select when secondary-side regulated 3.3 V is needed and 50 Mbps suffices for control loop bandwidth.

Compared with ADUM140D0BRWZ and ISO6741QDWR, the SI8442BB-D-IU offers superior timing precision (≤9.5 ns delay, ≤1.8 ns skew) and AEC-Q100 qualification for automotive HEV systems, while trading off isolation voltage for lower power at 100+ Mbps operation.

Availability

SI8442BB-D-IU is available at Aetrix Electronics and suitable for industrial automation systems, hybrid electric vehicles, and isolated switch-mode supplies requiring stable component supply and long-term lifecycle support.

Supply support for SI8442BB-D-IU 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

Silicon Labs is a fabless semiconductor company specializing in high-performance analog-intensive mixed-signal ICs for timing, isolation, and wireless applications.

The Si84xx family was designed specifically for replacing optocouplers in high-noise industrial and automotive power systems, emphasizing low propagation delay, high CMTI, and extended temperature operation without performance degradation.

FAQ

What is the maximum data rate supported by the SI8442BB-D-IU?

The SI8442BB-D-IU supports a maximum data rate of 150 Mbps, verified across the full operating temperature range (–40 °C to +125 °C) and supply range (2.70–5.5 V). This is specified for the 'Bx' variant in the Si844x family and confirmed in Tables 3–5 of the Rev. 1.7 datasheet under timing characteristics for Si844xBx devices.

Does the SI8442BB-D-IU require external components for basic operation?

Yes-the SI8442BB-D-IU requires only VDD bypass capacitors (0.1 µF ceramic per supply pin) as stated in the datasheet introduction. No external resistors, pull-ups, or initialization firmware are needed. Its RF-based architecture eliminates start-up delays, making it truly plug-and-play for digital isolation tasks.

What safety certifications apply to the SI8442BB-D-IU?

The SI8442BB-D-IU is certified to UL 1577 (2500 V_RMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 (reinforced insulation). These apply to the 2.5 kV_RMS rated version and are production-tested to 3.0 kV_RMS for 1 second, as documented in Table 6 and Section 1.1 of the datasheet.

How does the SI8442BB-D-IU handle enable functionality?

The SI8442BB-D-IU has two enable inputs (EN1 and EN2, pins 7 and 8) controlling channels 1–2 and 3–4 respectively. When an enable pin is low, its associated outputs go low (Revision C behavior, confirmed in Section 3.1 of the datasheet). This allows selective channel shutdown to reduce dynamic power in partial-operation modes.

Is the SI8442BB-D-IU suitable for automotive applications?

Yes-the SI8442BB-D-IU is AEC-Q100 qualified (Grade 1, –40 °C to +125 °C), explicitly listed in the "Features" section of the datasheet. It is deployed in hybrid electric vehicle applications including battery management systems and onboard chargers where reinforced isolation and high CMTI are critical.

SI8442BB-D-IU Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 16-SSOP (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Not For New Designs

Technology:: Capacitive Coupling

Type:: General Purpose

Isolated Power:: Yes

Number of Channels:: 4

Inputs - Side 1/Side 2:: 2/2

Channel Type:: Unidirectional

Voltage - Isolation:: 2500Vrms

Common Mode Transient Immunity (Min):: 25kV/µs (Typ)

Data Rate:: 150Mbps

Propagation Delay tpLH / tpHL (Max):: 9.5ns, 9.5ns

Pulse Width Distortion (Max):: 2.5ns

Rise / Fall Time (Typ):: 3.8ns, 2.8ns

Voltage - Supply:: 2.7V ~ 5.5V

Grade:: -

Qualification:: -

Operating Temperature:: -40°C ~ 125°C

Mounting Type:: Surface Mount

Supplier Device Package:: 16-QSOP

SI8442BB-D-IU FAQ

1.How can I place an order for SI8442BB-D-IU through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8442BB-D-IU on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SI8442BB-D-IU reliable?

The price and inventory of SI8442BB-D-IU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8442BB-D-IU is usually 5 days.

3.What payment methods are accepted for SI8442BB-D-IU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8442BB-D-IU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8442BB-D-IU?

SI8442BB-D-IU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8442BB-D-IU order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SI8442BB-D-IU?

For technical support, including SI8442BB-D-IU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8442BB-D-IU requirements.

6.How does Aetrix verify that SI8442BB-D-IU is sourced from the original manufacturer or authorized distributors?

All SI8442BB-D-IU products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI8442BB-D-IU meets industry standards.

7.What is the process for return or replacement of SI8442BB-D-IU?

All SI8442BB-D-IU units undergo pre-shipment inspection (PSI). If there is an issue with SI8442BB-D-IU, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SI8442BB-D-IU part is unused and in its original packaging.

Return procedure for SI8442BB-D-IU:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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