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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8442BA-D-IU

Name: SI8442BA-D-IU
Brand: Skyworks Solutions Inc.
SKU: SI8442BA-D-IU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8442BA-D-IU

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8442BA-D-IU.pdf

Description:: DGTL ISO 1000VRMS 4CH GP 16QSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8442BA-D-IU from Skyworks Solutions is a four-channel digital isolator with CMOS-based RF isolation barrier, supporting up to 150 Mbps data rate, <9.5 ns worst-case propagation delay, and 0.5 ns typical channel-to-channel skew in a 16-pin QSOP package. It operates across 2.70–5.5 V supply rails on both sides and delivers ultra-low power consumption-11.8 mA per side at 100 Mbps under 5 V-enabling use in isolated motor control gate drivers and industrial PLC I/O modules.

For engineers reviewing the SI8442BA-D-IU datasheet, SI8442BA-D-IU pinout, SI8442BA-D-IU application, or SI8442BA-D-IU equivalent, key selection criteria include its 1000 VRMS isolation rating, 25 kV/µs common-mode transient immunity, precise timing performance at 125 °C ambient, and compatibility with 3.3 V/5 V mixed-voltage system interfaces.

Technical Context

The SI8442BA-D-IU implements RF-based on/off keying modulation across a monolithic semiconductor isolation barrier, eliminating start-up initialization and enabling deterministic timing behavior without external clock or configuration. Each of its four unidirectional channels features independent enable control (ENx) and operates with matched input/output supply domains (VDD1/VDD2).

Its architecture achieves <1.5 ns pulse width distortion and <3.0 ns propagation delay skew between channels, supporting synchronous sampling in isolated ADC/DAC interfaces and high-fidelity signal integrity in 150 Mbps industrial Ethernet PHY isolation. The device maintains stable electrical characteristics from –40 to 125 °C without derating.

Key Specifications

Parameter	Value and Actual Design Meaning
Channels	4 unidirectional, independently enabled signal paths for galvanic separation of digital control lines.
Max Data Rate	150 Mbps - supports high-speed serial interfaces such as isolated SPI, RS-485 transceiver control, and PWM feedback loops.
Propagation Delay	3.0–9.5 ns - enables sub-10 ns timing-critical applications like real-time motor phase current sensing and gate driver dead-time control.
Isolation Rating	1000 VRMS (1 min) - certified to UL 1577, VDE IEC 60747-5-2, and CSA 5A for reinforced insulation in industrial safety systems.
Supply Voltage Range	2.70–5.5 V per side - allows interoperability between 3.3 V microcontrollers and 5 V analog front-ends without level shifters.
CMTI	25 kV/µs - ensures robust operation in noisy environments like variable-frequency drives and power inverters with fast-switching SiC MOSFETs.
Operating Temperature	–40 to 125 °C - rated for full 150 Mbps performance across automotive under-hood and industrial ambient conditions.

Pinout & Package

SI8442BA-D-IU is housed in a RoHS-compliant 16-pin QSOP package (5.3 mm × 10.2 mm, 1.0 mm height) with 1.27 mm pitch and creepage/clearance ≥3.6 mm per IEC 60664-1.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	Input Channels A1–A4	Digital logic inputs referenced to VDD1; accept 2.0 V VIH / 0.8 V VIL thresholds compatible with 3.3 V and 5 V logic families.
5, 6, 7, 8	VDD1 Power	Primary-side supply rail (2.70–5.5 V); bypass capacitor required per channel for noise suppression.
9, 10, 11, 12	Output Channels B1–B4	Isolated logic outputs referenced to VDD2; drive 4 mA sink/source with VOH ≥ VDD2–0.4 V and VOL ≤ 0.4 V.
13, 14, 15, 16	VDD2 Power	Secondary-side supply rail (2.70–5.5 V); electrically isolated from VDD1; requires separate bypass capacitor.

Key Features

Feature	Design Value
RF-based isolation barrier	Eliminates LED aging and temperature drift issues of optocouplers; no start-up delay or initialization sequence required.
Per-channel enable control	Each output (B1–B4) has dedicated EN pin allowing dynamic channel gating for power-aware system states and fault isolation.
Ultra-low power at high speed	11.8 mA per side at 100 Mbps / 5 V - reduces thermal load in densely packed I/O modules and extends battery life in portable test equipment.
Precision timing matching	0.5 ns typical channel-to-channel skew and 2.0 ns max propagation delay skew - critical for synchronized multi-axis motor control and time-of-flight measurements.
High CMTI immunity	25 kV/µs common-mode transient rejection - prevents false triggering during fast dV/dt events in SiC/GaN power stages.

Applications

Industrial PLC I/O Modules	Isolated Switch-Mode Power Supplies
Use Scenario: Digital input/output expansion cards in programmable logic controllers require galvanic isolation between field-side sensors/actuators and backplane logic. IC Role / Device Role / Timing Role: SI8442BA-D-IU provides four independent isolated signal paths for status reporting and command execution with <10 ns latency. Use Value: Enables direct interface to 24 V DC field wiring while maintaining 1000 VRMS working voltage and EMC resilience in factory-floor EMI environments.	Use Scenario: Secondary-side feedback and primary-side gate drive signals in isolated DC-DC converters demand robust noise immunity and tight timing. IC Role / Device Role / Timing Role: SI8442BA-D-IU isolates PWM duty-cycle commands and error amplifier outputs across transformer boundaries with sub-10 ns propagation delay. Use Value: Supports >1 MHz switching frequencies in GaN-based PSUs by minimizing timing uncertainty and rejecting >20 kV/µs transients from power stage switching.
Motor Control Gate Drivers	Isolated Data Acquisition Systems
Use Scenario: Three-phase inverter systems require isolated gate signals for upper/lower IGBT/SiC FET pairs plus fault feedback to controller. IC Role / Device Role / Timing Role: SI8442BA-D-IU delivers four precisely timed, independently enabled gate drive signals with <1.5 ns pulse width distortion. Use Value: Ensures accurate dead-time enforcement and prevents shoot-through in high-power motor drives operating at 125 °C junction temperature.	Use Scenario: High-resolution ADCs in medical or test equipment must be isolated from noisy digital processing units while preserving signal fidelity. IC Role / Device Role / Timing Role: SI8442BA-D-IU isolates serial interface lines (e.g., SPI SCLK/MOSI/MISO) between isolated ADC and host MCU with matched channel delays. Use Value: Maintains <1 LSB integral nonlinearity over temperature by eliminating timing-induced sampling jitter in isolated 16+ bit SAR ADC systems.

Industrial PLC I/O Modules

Isolated Switch-Mode Power Supplies

Use Scenario: Digital input/output expansion cards in programmable logic controllers require galvanic isolation between field-side sensors/actuators and backplane logic.

IC Role / Device Role / Timing Role: SI8442BA-D-IU provides four independent isolated signal paths for status reporting and command execution with <10 ns latency.

Use Value: Enables direct interface to 24 V DC field wiring while maintaining 1000 VRMS working voltage and EMC resilience in factory-floor EMI environments.

Use Scenario: Secondary-side feedback and primary-side gate drive signals in isolated DC-DC converters demand robust noise immunity and tight timing.

IC Role / Device Role / Timing Role: SI8442BA-D-IU isolates PWM duty-cycle commands and error amplifier outputs across transformer boundaries with sub-10 ns propagation delay.

Use Value: Supports >1 MHz switching frequencies in GaN-based PSUs by minimizing timing uncertainty and rejecting >20 kV/µs transients from power stage switching.

Motor Control Gate Drivers

Isolated Data Acquisition Systems

Use Scenario: Three-phase inverter systems require isolated gate signals for upper/lower IGBT/SiC FET pairs plus fault feedback to controller.

IC Role / Device Role / Timing Role: SI8442BA-D-IU delivers four precisely timed, independently enabled gate drive signals with <1.5 ns pulse width distortion.

Use Value: Ensures accurate dead-time enforcement and prevents shoot-through in high-power motor drives operating at 125 °C junction temperature.

Use Scenario: High-resolution ADCs in medical or test equipment must be isolated from noisy digital processing units while preserving signal fidelity.

IC Role / Device Role / Timing Role: SI8442BA-D-IU isolates serial interface lines (e.g., SPI SCLK/MOSI/MISO) between isolated ADC and host MCU with matched channel delays.

Use Value: Maintains <1 LSB integral nonlinearity over temperature by eliminating timing-induced sampling jitter in isolated 16+ bit SAR ADC systems.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM140D0BRZ	4-channel, 150 Mbps, 2.5 V–3.6 V only; 10 ns max propagation delay; 3.75 kV RMS isolation.	Limited to low-voltage systems; lacks 5 V tolerance and extended temperature support beyond 105 °C.	Choose when operating exclusively at 3.3 V and requiring UL/CSA certification without VDE compliance.
ISO6741QDR	4-channel, 50 Mbps, 1.71–5.5 V; 16 ns max propagation delay; 5000 VRMS isolation; integrated LDO on secondary side.	Lower speed and higher latency; includes on-chip regulator but consumes more quiescent current at idle.	Prefer for cost-sensitive designs needing integrated regulation and higher isolation voltage, accepting reduced bandwidth.

Compared with ADUM140D0BRZ and ISO6741QDR, SI8442BA-D-IU uniquely combines 150 Mbps speed, 5 V supply flexibility, 125 °C full-speed operation, and VDE/UL/CSA triple certification-making it optimal for high-reliability industrial motion control where timing precision and thermal margin are critical.

Availability

SI8442BA-D-IU is available at Aetrix Electronics and suitable for industrial automation systems, isolated switch mode supplies, and motor control applications requiring stable component supply and long-term lifecycle assurance.

Supply support for SI8442BA-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

Skyworks Solutions is a global leader in high-performance analog semiconductors, specializing in RF, timing, and isolation technologies for demanding communications and industrial markets.

The SI8442BA-D-IU belongs to Skyworks' Si84xx family of RF-based digital isolators, engineered specifically for high-speed, low-power, and thermally robust galvanic isolation in next-generation industrial and automotive power systems.

FAQ

What is the maximum operating temperature for full-speed operation of the SI8442BA-D-IU?

The SI8442BA-D-IU is fully specified for 150 Mbps operation across –40 to 125 °C ambient temperature. Its propagation delay remains within 3.0–9.5 ns and channel skew stays ≤0.5 ns typical at 125 °C, making it suitable for under-hood automotive and high-temperature industrial environments where legacy optocouplers degrade.

Does the SI8442BA-D-IU require external components for basic operation?

Yes-the SI8442BA-D-IU requires only 0.1 µF ceramic bypass capacitors on each VDD1 and VDD2 pin, placed as close as possible to the device. No external resistors, level shifters, or initialization firmware are needed due to its RF modulation architecture and zero-startup-delay design.

How does the enable function work on the SI8442BA-D-IU?

Each output channel (B1–B4) has a dedicated enable input (EN1–EN4) on the secondary side. When ENx is logic low, the corresponding output enters high-impedance state; when high or floating (NC), the channel passes input A1–A4 with full timing performance. This enables dynamic channel shutdown for power savings or fault containment.

Is the SI8442BA-D-IU pin-compatible with other devices in the Si844x family?

Yes-SI8442BA-D-IU shares identical 16-pin QSOP pinout and supply configuration with all Si844x variants (e.g., SI8440, SI8441). Differences lie in channel count, directionality, and enable functionality-not physical layout-allowing drop-in replacement within the same package footprint and PCB land pattern.

What safety certifications apply to the SI8442BA-D-IU?

The SI8442BA-D-IU carries UL 1577 recognition (1000 VRMS, 1 min), CSA Component Acceptance Notice 5A, and VDE IEC 60747-5-2 certification (560 Vpeak working voltage). These approvals validate its suitability for reinforced insulation in safety-critical industrial and medical equipment meeting IEC 61800-5-1 and IEC 62368-1 standards.

SI8442BA-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:: No

Number of Channels:: 4

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

Channel Type:: Unidirectional

Voltage - Isolation:: 1000Vrms

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

SI8442BA-D-IU FAQ

1.How can I place an order for SI8442BA-D-IU through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8442BA-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 SI8442BA-D-IU reliable?

The price and inventory of SI8442BA-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 SI8442BA-D-IU is usually 5 days.

3.What payment methods are accepted for SI8442BA-D-IU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8442BA-D-IU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8442BA-D-IU?

SI8442BA-D-IU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8442BA-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 SI8442BA-D-IU?

For technical support, including SI8442BA-D-IU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8442BA-D-IU requirements.

6.How does Aetrix verify that SI8442BA-D-IU is sourced from the original manufacturer or authorized distributors?

All SI8442BA-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 SI8442BA-D-IU meets industry standards.

7.What is the process for return or replacement of SI8442BA-D-IU?

All SI8442BA-D-IU units undergo pre-shipment inspection (PSI). If there is an issue with SI8442BA-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 SI8442BA-D-IU part is unused and in its original packaging.

Return procedure for SI8442BA-D-IU:

1.Submit a request within 90 days.

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

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