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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8442AB-D-IS1

Name: SI8442AB-D-IS1
Brand: Skyworks Solutions Inc.
SKU: SI8442AB-D-IS1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8442AB-D-IS1

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8442AB-D-IS1.pdf

Description:: DGTL ISO 2500VRMS 4CH GP 16SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8442AB-D-IS1 from Skyworks Solutions is a quad-channel, ultra-low-power digital isolator in a 16-pin wide-body SOIC package, supporting up to 150 Mbps data rate with worst-case propagation delay <9.5 ns, 0.5 ns channel-channel skew, and 25 kV/µs common-mode transient immunity. It operates across 2.70–5.5 V supply rails and delivers <11.8 mA per side at 100 Mbps (5 V), enabling high-speed isolation in motor control and isolated ADC interfaces.

For engineers reviewing the SI8442AB-D-IS1 datasheet, SI8442AB-D-IS1 pinout, SI8442AB-D-IS1 application, or SI8442AB-D-IS1 equivalent, key selection criteria include its 2.5 kV_RMS reinforced insulation rating, AEC-Q100 qualification, –40 to +125 °C operation at full speed, and compatibility with both 3.3 V and 5 V systems without level-shifting.

Technical Context

The SI8442AB-D-IS1 implements capacitive isolation with on-chip RF modulation/demodulation for signal transfer across the isolation barrier. Its four independent bidirectional channels support DC-coupled logic-level transmission with no start-up initialization required and stable timing over temperature and voltage.

It features an enable input per side (EN1/EN2) controlling output tri-state behavior, precise timing specs including <1.5 ns pulse width distortion and <3 ns propagation delay skew, and integrated 85 Ω output impedance matching for controlled-impedance PCB routing-eliminating external termination resistors in most 50 Ω environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	Up to 150 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and real-time feedback loops.
Propagation Delay	3.0–9.5 ns (typ/max) - enables sub-10 ns timing-critical sampling in isolated gate drivers and ADC synchronization.
Channel-Channel Skew	0.5–1.8 ns (typ/max) - ensures deterministic phase alignment across all four channels for multi-bit parallel isolation.
Supply Voltage Range	2.70–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V legacy peripherals without level shifters.
Isolation Rating	2500 V_RMS (1 min) - certified to UL 1577, CSA Component Notice 5A, and VDE IEC 60747-5-2 for reinforced insulation.
Common-Mode Transient Immunity	25 kV/µs - maintains signal integrity in noisy motor drive and power inverter environments with fast switching edges.
Operating Temperature	–40 to +125 °C at 150 Mbps - qualified for under-hood automotive and industrial ambient conditions without derating.

Pinout & Package

SI8442AB-D-IS1 is housed in a 16-pin wide-body SOIC package (WB-SOIC-16) with 8.0 mm creepage/clearance, RoHS-compliant, and rated for 2.5 kV_RMS isolation. Pin numbering follows standard SOIC convention (pin 1 = top-left corner, notch indicator).

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Primary-side supply	Power for inputs and channel 1–2 transmitters; accepts 2.70–5.5 V with bypass capacitor required.
GND1	Primary-side ground	Reference for VDD1 and input signals; must be separated from secondary-side ground by isolation barrier.
IN1, IN2	Input channels 1–2	CMOS-compatible digital inputs referenced to GND1; VIH ≥ 2.0 V, VIL ≤ 0.8 V.
OUT1, OUT2	Output channels 1–2	CMOS outputs referenced to GND2; VOH ≥ VDD2 – 0.4 V, VOL ≤ 0.4 V at 4 mA sink.
EN1	Primary-side enable	Active-high control: drives OUT1/OUT2 low when low; tri-states outputs when high (per datasheet Figure 1).
VDD2	Secondary-side supply	Power for outputs and channel 1–2 receivers; independent 2.70–5.5 V rail decoupled from VDD1.
GND2	Secondary-side ground	Reference for VDD2 and outputs; galvanically isolated from GND1; defines isolation barrier boundary.
IN3, IN4	Input channels 3–4	CMOS inputs on secondary side; functionally identical to IN1/IN2 but referenced to GND2.
OUT3, OUT4	Output channels 3–4	CMOS outputs on primary side; referenced to GND1; completes bidirectional channel pairing.
EN2	Secondary-side enable	Active-high control for OUT3/OUT4; mirrors EN1 functionality on opposite side of isolation barrier.

Key Features

Feature	Design Value
Ultra-low power at 100 Mbps	11.8 mA per side (5 V) - reduces thermal load and enables compact, fanless industrial designs.
Sub-10 ns worst-case propagation delay	9.5 ns max - meets tight timing budgets in servo motor control and isolated current sensing loops.
Bidirectional channel configuration	Two input-output pairs per side (IN1/OUT1, IN2/OUT2, etc.) - supports flexible signal routing without external direction control logic.
Integrated 85 Ω output impedance	±40% tolerance - matches standard PCB trace impedances, minimizing reflections in high-speed layouts without discrete termination.
AEC-Q100 qualified	Grade 1 (–40 to +125 °C) - validated for automotive subsystems including battery management and traction inverter control.

Applications

Industrial Motor Control	Isolated Data Acquisition
Use Scenario: Isolating PWM gate drive signals and current-sense feedback in 3-phase inverter stacks. IC Role / Device Role: Quad-channel digital isolator providing independent, low-skew isolation for upper/lower gate drivers and analog-to-digital converter (ADC) serial interface lines. Use Value: Enables simultaneous sampling of phase currents with <1.8 ns inter-channel skew, preserving vector control accuracy at 20 kHz switching frequencies.	Use Scenario: Isolating SPI communication between a microcontroller and isolated sigma-delta ADC in high-voltage energy metering. IC Role / Device Role: Transmitting clock, data, and frame sync across isolation barrier while rejecting common-mode noise from 10 kV line transients. Use Value: Maintains 150 Mbps throughput and 25 kV/µs CMTI to prevent bit errors during lightning-induced surges on meter front-end sensors.
Automotive Battery Management	Isolated Switch-Mode Power Supply
Use Scenario: Level-shifting and isolating cell voltage monitoring signals in 400 V EV battery packs. IC Role / Device Role: Providing reinforced insulation between high-side cell monitor ICs and low-voltage MCU domain via four independent channels. Use Value: Meets IEC 60747-5-2 and AEC-Q100 Grade 1 requirements for functional safety in ASIL-C BMS architectures.	Use Scenario: Isolating feedback signals (voltage, current, temperature) from secondary side to primary-side PWM controller in LLC resonant converters. IC Role / Device Role: Replacing optocouplers with higher speed, lower drift, and tighter timing for adaptive dead-time control. Use Value: Reduces propagation delay variation to <3 ns skew, enabling precise synchronous rectification timing and >96% efficiency at 300 kHz.

Industrial Motor Control

Isolated Data Acquisition

Use Scenario: Isolating PWM gate drive signals and current-sense feedback in 3-phase inverter stacks.

IC Role / Device Role: Quad-channel digital isolator providing independent, low-skew isolation for upper/lower gate drivers and analog-to-digital converter (ADC) serial interface lines.

Use Value: Enables simultaneous sampling of phase currents with <1.8 ns inter-channel skew, preserving vector control accuracy at 20 kHz switching frequencies.

Use Scenario: Isolating SPI communication between a microcontroller and isolated sigma-delta ADC in high-voltage energy metering.

IC Role / Device Role: Transmitting clock, data, and frame sync across isolation barrier while rejecting common-mode noise from 10 kV line transients.

Use Value: Maintains 150 Mbps throughput and 25 kV/µs CMTI to prevent bit errors during lightning-induced surges on meter front-end sensors.

Automotive Battery Management

Isolated Switch-Mode Power Supply

Use Scenario: Level-shifting and isolating cell voltage monitoring signals in 400 V EV battery packs.

IC Role / Device Role: Providing reinforced insulation between high-side cell monitor ICs and low-voltage MCU domain via four independent channels.

Use Value: Meets IEC 60747-5-2 and AEC-Q100 Grade 1 requirements for functional safety in ASIL-C BMS architectures.

Use Scenario: Isolating feedback signals (voltage, current, temperature) from secondary side to primary-side PWM controller in LLC resonant converters.

IC Role / Device Role: Replacing optocouplers with higher speed, lower drift, and tighter timing for adaptive dead-time control.

Use Value: Reduces propagation delay variation to <3 ns skew, enabling precise synchronous rectification timing and >96% efficiency at 300 kHz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM140D0BRIZ	4-channel, 150 Mbps, 2.5 kV_RMS, 16-pin SOIC narrow body; propagation delay 12.5 ns max; no enable pins.	Lacks EN1/EN2 control; narrower creepage (4.01 mm) limits use in >300 V_RMS working voltage designs.	Choose ADUM140D0BRIZ only if board space is constrained and enable functionality is unnecessary.
ISO6741QDWR	4-channel, 50 Mbps, 5 kV_RMS, 16-pin SOIC wide body; AEC-Q100 qualified; propagation delay 25 ns max.	Lower speed and higher delay limit use in >10 MHz SPI or real-time control loops.	Prefer ISO6741QDWR where higher isolation voltage (5 kV_RMS) is mandatory and data rate ≤50 Mbps suffices.

Compared with ADUM140D0BRIZ and ISO6741QDWR, SI8442AB-D-IS1 uniquely combines 150 Mbps speed, sub-10 ns delay, dual enable inputs, and 2.5 kV_RMS wide-body packaging-making it optimal for high-fidelity motor control and automotive BMS where timing precision and layout flexibility are critical.

Availability

SI8442AB-D-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 design continuity.

Supply support for SI8442AB-D-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, high-speed digital isolation in automotive, industrial, and energy infrastructure applications-replacing optocouplers with superior timing, power, and lifetime performance.

FAQ

What is the maximum operating temperature for SI8442AB-D-IS1 at full 150 Mbps data rate?

The SI8442AB-D-IS1 is fully specified to operate from –40 to +125 °C at 150 Mbps, with no derating required. This rating is verified per Table 1 in the datasheet and supported by AEC-Q100 Grade 1 qualification, making SI8442AB-D-IS1 suitable for under-hood automotive and high-ambient industrial environments.

Does SI8442AB-D-IS1 require external pull-up or pull-down resistors on its input pins?

No, SI8442AB-D-IS1 does not require external pull-up or pull-down resistors on IN1–IN4. Its CMOS inputs have defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds with ±10 µA leakage, ensuring robust logic-level recognition without external biasing-reducing BOM count and layout complexity.

How does the enable functionality work on SI8442AB-D-IS1?

SI8442AB-D-IS1 has two independent enable inputs: EN1 controls OUT1/OUT2, and EN2 controls OUT3/OUT4. When asserted high, outputs drive normally; when low, outputs go low (not high-impedance). Tri-state behavior is not supported-only active-low assertion forces output low, as confirmed in Section 3.1 of the datasheet.

Can SI8442AB-D-IS1 be used with 2.7 V supplies on both sides simultaneously?

Yes, SI8442AB-D-IS1 supports 2.70 V on both VDD1 and VDD2 simultaneously, delivering <7.2 mA per side at 100 Mbps (Table 5). All timing and isolation specifications-including 150 Mbps data rate and 25 kV/µs CMTI-remain valid across the full 2.70–5.5 V range per side, enabling low-voltage battery-powered designs.

What safety certifications apply to SI8442AB-D-IS1?

SI8442AB-D-IS1 carries UL 1577 (2500 V_RMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 certifications. These cover reinforced insulation up to 560 V_PEAK working voltage and are production-tested to 3.0 kV_RMS for 1 second, as documented in Tables 6 and 7 of the datasheet.

SI8442AB-D-IS1 Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 16-SOIC (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:: 2500Vrms

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

Data Rate:: 1Mbps

Propagation Delay tpLH / tpHL (Max):: 35ns, 35ns

Pulse Width Distortion (Max):: 25ns

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-SOIC

SI8442AB-D-IS1 FAQ

1.How can I place an order for SI8442AB-D-IS1 through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8442AB-D-IS1 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 SI8442AB-D-IS1 reliable?

The price and inventory of SI8442AB-D-IS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8442AB-D-IS1 is usually 5 days.

3.What payment methods are accepted for SI8442AB-D-IS1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8442AB-D-IS1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8442AB-D-IS1?

SI8442AB-D-IS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8442AB-D-IS1 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 SI8442AB-D-IS1?

For technical support, including SI8442AB-D-IS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8442AB-D-IS1 requirements.

6.How does Aetrix verify that SI8442AB-D-IS1 is sourced from the original manufacturer or authorized distributors?

All SI8442AB-D-IS1 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 SI8442AB-D-IS1 meets industry standards.

7.What is the process for return or replacement of SI8442AB-D-IS1?

All SI8442AB-D-IS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8442AB-D-IS1, 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 SI8442AB-D-IS1 part is unused and in its original packaging.

Return procedure for SI8442AB-D-IS1:

1.Submit a request within 90 days.

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

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