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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8440AB-C-IS

Name: SI8440AB-C-IS
Brand: Skyworks Solutions Inc.
SKU: SI8440AB-C-IS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8440AB-C-IS

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

Package:: 16-SOIC (0.295", 7.50mm Width)

Datasheet:: SI8440AB-C-IS.pdf

Description:: DIGITAL ISOLATOR 4CH 16SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8440AB-C-IS from Skyworks Solutions is a quad-channel digital isolator in a 16-pin wide-body SOIC package, delivering 150 Mbps data rate, <9.5 ns worst-case propagation delay, and 2.5 kV_RMS reinforced isolation. It operates from 2.70–5.5 V on both sides and supports industrial automation, motor control, and isolated ADC/DAC interfaces with AEC-Q100 qualification.

For engineers reviewing the SI8440AB-C-IS datasheet, SI8440AB-C-IS pinout, SI8440AB-C-IS application, or SI8440AB-C-IS equivalent, key selection criteria include channel count, 150 Mbps high-speed capability, ultra-low power at 100 Mbps (<24.3 mA total), and VDE/UL/CSA safety certification for 2.5 kV_RMS working voltage.

Technical Context

The SI8440AB-C-IS uses capacitive CMOS isolation technology with differential RF signaling across an SiO₂ barrier, enabling stable timing performance across –40 to +125 °C. Its architecture supports independent supply domains (VDD1/VDD2), no start-up initialization, and enable-controlled output tri-state.

It achieves 25 kV/µs common-mode transient immunity (CMTI) and features precise timing: 1.5 ns typical pulse width distortion, 0.5 ns typical channel-to-channel skew, and 6 ns minimum pulse width - critical for gate driver and feedback loop isolation in power inverters.

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 motor encoder feedback.
Propagation Delay	3.0–9.5 ns (typ–max) - enables tight timing budgets in closed-loop control systems with sub-10 ns latency.
Isolation Voltage	2500 V_RMS (1 min) - certified for reinforced insulation per UL 1577, VDE 0884-2, and CSA 5A, suitable for 600 V_RMS working voltage systems.
Supply Range	2.70–5.5 V on both VDD1 and VDD2 - allows interoperability with 3.3 V microcontrollers and 5 V analog subsystems without level shifters.
Power Consumption	<24.3 mA total at 100 Mbps (5 V) - reduces thermal load in densely packed industrial I/O modules.
CMTI	25 kV/µs - ensures robust operation in noisy motor drive and SMPS environments with fast switching transients.
Operating Temperature	–40 to +125 °C - validated for automotive under-hood and industrial ambient conditions at full 150 Mbps data rate.

Pinout & Package

SI8440AB-C-IS is housed in a 16-pin wide-body SOIC (WB-SOIC-16) package with 8.0 mm creepage/clearance, optimized for reinforced insulation compliance. Pin numbering follows standard SOIC convention (pin 1 = top-left corner, notch side).

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Primary-side supply	Power input for input-side logic and channel 1–2 drivers; decoupling capacitor required.
GND1	Primary-side ground	Reference for input signals and VDD1; must be separated from secondary ground by isolation barrier.
IN1, IN2	Input channels 1–2	CMOS-compatible digital inputs accepting 0–VDD1 logic levels; no external pull-ups needed.
EN1	Channel 1–2 enable	Active-high control: drives outputs low when low; tri-states outputs when high (per Figure 1 timing).
VDD2	Secondary-side supply	Independent power for output-side logic and channel 3–4 drivers; supports different voltage than VDD1.
GND2	Secondary-side ground	Reference for output signals and VDD2; galvanically isolated from GND1.
OUT3, OUT4	Output channels 3–4	CMOS outputs with 85 Ω nominal impedance; require controlled-impedance PCB routing above 50 Mbps.
EN2	Channel 3–4 enable	Independent enable for secondary-side outputs; allows selective channel shutdown to reduce dynamic power.

Key Features

Feature	Design Value
Quad-channel isolation	Four independent signal paths in one package - reduces board space vs. discrete optocouplers and simplifies layout for multi-signal isolation (e.g., PWM + feedback + fault).
150 Mbps data rate	Supports high-resolution encoder interfaces and fast SPI clocking (e.g., 40 MHz SCLK) without timing margin loss.
0.5 ns channel-to-channel skew	Enables synchronous sampling of multiple analog channels via isolated ADCs with minimal inter-channel phase error.
AEC-Q100 qualified	Validated for automotive applications including hybrid electric vehicle battery management and traction inverter control.
No start-up initialization	Outputs become valid within 40 µs of power application - eliminates boot-time delays in safety-critical power-on sequences.

Applications

Industrial Motor Control	Isolated Power Supply Feedback
Use Scenario: Isolating gate drive signals and current-sense feedback in 3-phase IGBT/SiC inverter stacks. IC Role / Device Role / Timing Role: Quad-channel isolator providing PWM input isolation (CH1–2) and isolated current/voltage sense output (CH3–4) with matched propagation delay. Use Value: 0.5 ns channel skew ensures synchronized switching across phases; 25 kV/µs CMTI prevents false triggering during 1000 V/µs bus transients.	Use Scenario: Transmitting error amplifier output and auxiliary status signals across isolation barrier in flyback or forward converters. IC Role / Device Role / Timing Role: Replacing optocouplers in TL431-based feedback loops to improve bandwidth and temperature stability. Use Value: 150 Mbps capability enables fast transient response; <9.5 ns delay improves loop stability margins vs. 100+ ns optocouplers.
Automotive Battery Management	Isolated Data Acquisition
Use Scenario: Isolating cell voltage monitoring and pack contactor control signals in high-voltage EV battery packs. IC Role / Device Role / Timing Role: Providing reinforced isolation between 400–800 V battery domain and 12 V MCU domain per IEC 60747-5-2. Use Value: 2.5 kV_RMS rating and AEC-Q100 qualification ensure long-term reliability under vibration, thermal cycling, and EMI stress.	Use Scenario: Isolating SPI interface between precision ADC (e.g., ADS131M04) and host processor in industrial DAQ systems. IC Role / Device Role / Timing Role: Transmitting 24-bit conversion results at up to 125 kSPS without bit errors caused by ground noise. Use Value: 2 pF input-output capacitance minimizes coupling of digital switching noise into analog front-end; 1.5 ns PWD preserves signal integrity.

Industrial Motor Control

Isolated Power Supply Feedback

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

IC Role / Device Role / Timing Role: Quad-channel isolator providing PWM input isolation (CH1–2) and isolated current/voltage sense output (CH3–4) with matched propagation delay.

Use Value: 0.5 ns channel skew ensures synchronized switching across phases; 25 kV/µs CMTI prevents false triggering during 1000 V/µs bus transients.

Use Scenario: Transmitting error amplifier output and auxiliary status signals across isolation barrier in flyback or forward converters.

IC Role / Device Role / Timing Role: Replacing optocouplers in TL431-based feedback loops to improve bandwidth and temperature stability.

Use Value: 150 Mbps capability enables fast transient response; <9.5 ns delay improves loop stability margins vs. 100+ ns optocouplers.

Automotive Battery Management

Isolated Data Acquisition

Use Scenario: Isolating cell voltage monitoring and pack contactor control signals in high-voltage EV battery packs.

IC Role / Device Role / Timing Role: Providing reinforced isolation between 400–800 V battery domain and 12 V MCU domain per IEC 60747-5-2.

Use Value: 2.5 kV_RMS rating and AEC-Q100 qualification ensure long-term reliability under vibration, thermal cycling, and EMI stress.

Use Scenario: Isolating SPI interface between precision ADC (e.g., ADS131M04) and host processor in industrial DAQ systems.

IC Role / Device Role / Timing Role: Transmitting 24-bit conversion results at up to 125 kSPS without bit errors caused by ground noise.

Use Value: 2 pF input-output capacitance minimizes coupling of digital switching noise into analog front-end; 1.5 ns PWD preserves signal integrity.

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
ADUM2402BRWZ	50 Mbps max data rate; 25 ns max propagation delay; 2.5 kV_RMS isolation; 16-pin SOIC narrow body.	Limited to lower-speed interfaces (e.g., I²C, slow SPI); narrower creepage (4.01 mm) restricts use in higher working voltage designs.	Choose for cost-sensitive, non-AEC-Q100 industrial applications where 150 Mbps is unnecessary.
ISO6742QDWR	50 Mbps max; 16 ns max propagation delay; 5 kV_RMS isolation; 16-pin SOIC wide body; automotive grade (AEC-Q100).	Higher isolation rating but lower speed; lacks enable pins for channel-level power gating.	Prefer when 5 kV_RMS test voltage is mandated, but accept reduced data throughput and no per-channel enable control.

Compared with ADUM2402BRWZ and ISO6742QDWR, SI8440AB-C-IS delivers 3× higher data rate and sub-10 ns timing precision while maintaining AEC-Q100 qualification and enable functionality - making it optimal for next-generation motor drives and BMS requiring both speed and automotive reliability.

Availability

SI8440AB-C-IS is available at Aetrix Electronics and suitable for industrial automation, hybrid electric vehicle powertrain systems, and isolated switch-mode supplies requiring stable component supply and long-term lifecycle support.

Supply support for SI8440AB-C-IS 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 safety-critical power conversion and automotive systems - emphasizing low power, precise timing, and regulatory compliance over legacy optocoupler alternatives.

FAQ

What is the maximum data rate supported by the SI8440AB-C-IS?

The SI8440AB-C-IS supports a maximum data rate of 150 Mbps, verified across its full operating temperature range (–40 to +125 °C) and supply voltage range (2.70–5.5 V). This specification applies to the 'B' variant (e.g., SI8440B-C-IS) as confirmed in Tables 3–5 of the official Skyworks datasheet Rev. 1.7. The 'A' variant is limited to 1 Mbps.

Does the SI8440AB-C-IS require external components for basic operation?

No, the SI8440AB-C-IS requires only VDD bypass capacitors (typically 0.1 µF ceramic) on each supply rail - no external resistors, pull-ups, or level shifters are needed. Its CMOS input/output structure and integrated enable logic eliminate external support circuitry, reducing BOM count and PCB area versus optocoupler-based solutions.

What safety certifications does the SI8440AB-C-IS hold?

The SI8440AB-C-IS is certified to UL 1577 (2500 V_RMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE 0884-2 (IEC 60747-5-2), all validated for 2.5 kV_RMS isolation. These certifications apply to the wide-body SOIC package (as indicated by the '-C' suffix) and cover reinforced insulation for working voltages up to 600 V_RMS.

How does the enable function operate on the SI8440AB-C-IS?

The SI8440AB-C-IS has two independent enable inputs (EN1 and EN2): EN1 controls channels 1–2, EN2 controls channels 3–4. When an enable pin is low, its associated outputs drive low; when high, outputs follow input states. Enable-to-data-valid delay is 5–8 ns (ten1), and enable-to-tri-state delay is 7–9.2 ns (ten2), enabling precise power-gating in multi-stage power systems.

Is the SI8440AB-C-IS suitable for automotive applications?

Yes, the SI8440AB-C-IS is AEC-Q100 qualified (Grade 1: –40 to +125 °C), with full 150 Mbps operation validated across that range. Its 2.5 kV_RMS isolation, 25 kV/µs CMTI, and VDE/UL/CSA certifications make it suitable for hybrid electric vehicle applications including battery management, on-board chargers, and traction inverter control.

SI8440AB-C-IS Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 16-SOIC (0.295", 7.50mm 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:: 4/0

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

SI8440AB-C-IS FAQ

1.How can I place an order for SI8440AB-C-IS through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8440AB-C-IS 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 SI8440AB-C-IS reliable?

The price and inventory of SI8440AB-C-IS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8440AB-C-IS is usually 5 days.

3.What payment methods are accepted for SI8440AB-C-IS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8440AB-C-IS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8440AB-C-IS?

SI8440AB-C-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8440AB-C-IS 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 SI8440AB-C-IS?

For technical support, including SI8440AB-C-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8440AB-C-IS requirements.

6.How does Aetrix verify that SI8440AB-C-IS is sourced from the original manufacturer or authorized distributors?

All SI8440AB-C-IS 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 SI8440AB-C-IS meets industry standards.

7.What is the process for return or replacement of SI8440AB-C-IS?

All SI8440AB-C-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8440AB-C-IS, 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 SI8440AB-C-IS part is unused and in its original packaging.

Return procedure for SI8440AB-C-IS:

1.Submit a request within 90 days.

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

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