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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8440BB-D-ISR

Name: SI8440BB-D-ISR
Brand: Skyworks Solutions Inc.
SKU: SI8440BB-D-ISR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8440BB-D-ISR

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8440BB-D-ISR.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8440BB-D-ISR 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, <9.5 ns worst-case propagation delay, and 2.5 kV_RMS isolation. It operates from 2.70–5.5 V on both sides and delivers <6 mA per channel at 100 Mbps (5 V), enabling high-speed signal isolation in motor control and isolated ADC interfaces.

For engineers reviewing the SI8440BB-D-ISR datasheet, SI8440BB-D-ISR pinout, SI8440BB-D-ISR application, or SI8440BB-D-ISR equivalent, this page provides verified timing specs, safety certifications (UL/CSA/VDE), supply current behavior across voltage and data rates, and precise channel-to-channel skew (<1.8 ns) for deterministic real-time system design.

Technical Context

The SI8440BB-D-ISR implements capacitive isolation with on-chip RF modulation/demodulation, delivering DC-to-150 Mbps operation without start-up initialization. Its dual-supply architecture supports independent 2.70–5.5 V domains on primary and secondary sides, enabling level-shifting between 3.3 V and 5 V logic systems.

It features an enable input per side (EN1/EN2), allowing dynamic power gating of isolated channels. With 25 kV/µs common-mode transient immunity and <1.5 ns pulse width distortion, it maintains signal integrity in noisy industrial environments such as inverter gate drive feedback loops.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	Up to 150 Mbps - supports high-resolution encoder interfaces and fast SPI bus isolation.
Propagation Delay	3.0–9.5 ns (typ/max) - enables sub-10 ns timing-critical feedback paths in servo drives.
Channel-Channel Skew	≤1.8 ns (max) - ensures synchronized sampling across multiple isolated ADC/DAC channels.
Supply Current @ 100 Mbps	<24.3 mA total (5 V) - reduces thermal load in compact, fanless industrial controllers.
Isolation Voltage	2500 V_RMS (1 min) - certified for reinforced insulation per UL 1577, CSA 5A, and VDE IEC 60747-5-2.
Common-Mode Transient Immunity	25 kV/µs - suppresses noise coupling in high-dV/dt motor inverter applications.
Operating Temperature	–40 °C to +125 °C at full 150 Mbps - qualified for under-hood automotive and industrial ambient conditions.

Pinout & Package

SI8440BB-D-ISR is housed in a 16-pin wide-body SOIC package (7.5 mm body width, 10.3 mm length) with creepage/clearance of 8.0 mm, certified for reinforced insulation per IEC 60747-5-2 and UL 1577.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	VDD1 (Primary-side supply)	Power input for input-side logic; accepts 2.70–5.5 V; bypass capacitor required.
5, 6, 7, 8	GND1 (Primary-side ground)	Reference for input-side signals; must be separated from GND2 by isolation barrier.
9, 10, 11, 12	GND2 (Secondary-side ground)	Reference for output-side signals; galvanically isolated from GND1.
13, 14, 15, 16	VDD2 (Secondary-side supply)	Power input for output-side logic; independent 2.70–5.5 V domain; enables level shifting.
1, 3, 5, 7, 9, 11, 13, 15	INx / OUTx (Bidirectional channel pins)	Pins 1/2 = CH1; 3/4 = CH2; 5/6 = CH3; 7/8 = CH4 - each pair crosses isolation barrier with direction determined by internal configuration.
2, 4, 6, 8	EN1 (Primary enable)	Active-high enable for all primary-side inputs; pulls outputs low when disabled (Revision C).
10, 12, 14, 16	EN2 (Secondary enable)	Active-high enable for all secondary-side outputs; tri-states outputs when disabled.

Key Features

Feature	Design Value
Quad-channel capacitive isolation	Four independent isolation channels in single SOIC-16 package - reduces board space vs. discrete optocouplers or dual isolators.
No start-up initialization	Valid output within 40 µs of power application - eliminates boot-time delays in safety-critical PLC I/O modules.
Ultra-low power at high speed	<6 mA per channel at 100 Mbps (5 V) - enables 4-channel isolation in thermally constrained 24 V industrial controllers.
Precision timing performance	0.5 ns typical channel-channel skew and 1.5 ns pulse width distortion - supports time-of-flight measurement and synchronized PWM generation.
AEC-Q100 qualified	Grade 1 (–40 °C to +125 °C) qualification - validated for use in hybrid electric vehicle battery management and traction inverter monitoring.

Applications

Industrial Motor Control	Isolated Data Acquisition
Use Scenario: Isolating gate driver signals and current-sense feedback in 3-phase IGBT/SiC inverter stacks. IC Role / Device Role / Timing Role: Quad-channel isolator providing independent, low-skew signal paths for PWM inputs and analog feedback return across isolation barrier. Use Value: Enables <9.5 ns propagation delay and <1.8 ns channel skew to maintain tight dead-time control and prevent shoot-through in high-frequency switching inverters.	Use Scenario: Isolating serial interface (SPI) between microcontroller and isolated ADC in high-voltage battery monitoring systems. IC Role / Device Role / Timing Role: Bidirectional isolator transmitting clock, data, and CS signals while blocking ground loops and high-voltage transients. Use Value: Supports 150 Mbps data rate and 25 kV/µs CMTI to preserve signal integrity during rapid battery cell voltage transitions.
Programmable Logic Controller I/O	Renewable Energy Inverters
Use Scenario: Digital input conditioning and output driving in modular PLC backplanes with mixed 24 V DC and field-side potentials. IC Role / Device Role / Timing Role: Four-channel isolator interfacing field sensors/actuators to controller logic with independent supply domains (VDD1=24 V LDO, VDD2=3.3 V MCU). Use Value: Dual 2.70–5.5 V supply range allows direct integration with industrial 24 V supplies and 3.3 V microcontrollers without level translators.	Use Scenario: Isolating communication and control signals between grid-side and PV-side controllers in string inverters. IC Role / Device Role / Timing Role: High-reliability isolator for RS-485, CAN, and PWM signals crossing 1000+ V potential differences in solar farm installations. Use Value: 2.5 kV_RMS isolation rating and 60-year lifetime at rated voltage ensure long-term reliability in outdoor, high-UV environments.

Industrial Motor Control

Isolated Data Acquisition

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

IC Role / Device Role / Timing Role: Quad-channel isolator providing independent, low-skew signal paths for PWM inputs and analog feedback return across isolation barrier.

Use Value: Enables <9.5 ns propagation delay and <1.8 ns channel skew to maintain tight dead-time control and prevent shoot-through in high-frequency switching inverters.

Use Scenario: Isolating serial interface (SPI) between microcontroller and isolated ADC in high-voltage battery monitoring systems.

IC Role / Device Role / Timing Role: Bidirectional isolator transmitting clock, data, and CS signals while blocking ground loops and high-voltage transients.

Use Value: Supports 150 Mbps data rate and 25 kV/µs CMTI to preserve signal integrity during rapid battery cell voltage transitions.

Programmable Logic Controller I/O

Renewable Energy Inverters

Use Scenario: Digital input conditioning and output driving in modular PLC backplanes with mixed 24 V DC and field-side potentials.

IC Role / Device Role / Timing Role: Four-channel isolator interfacing field sensors/actuators to controller logic with independent supply domains (VDD1=24 V LDO, VDD2=3.3 V MCU).

Use Value: Dual 2.70–5.5 V supply range allows direct integration with industrial 24 V supplies and 3.3 V microcontrollers without level translators.

Use Scenario: Isolating communication and control signals between grid-side and PV-side controllers in string inverters.

IC Role / Device Role / Timing Role: High-reliability isolator for RS-485, CAN, and PWM signals crossing 1000+ V potential differences in solar farm installations.

Use Value: 2.5 kV_RMS isolation rating and 60-year lifetime at rated voltage ensure long-term reliability in outdoor, high-UV environments.

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	2.5 kV_RMS, 25 Mbps max, 35 ns max propagation delay, 5 V only supply	Limited to lower-speed control loops; no 2.7 V operation or AEC-Q100 qualification	Prefer ADUM2402BRWZ where cost sensitivity outweighs speed and extended voltage range requirements.
ISO6741QDWR	5000 V_RMS, 50 Mbps, 25 ns max propagation delay, 1.71–5.5 V supply, automotive AEC-Q100 Grade 0	Higher isolation rating but lower speed; optimized for infotainment CAN isolation, not high-speed motor control	Choose ISO6741QDWR when >3.75 kV_RMS working voltage or –40 °C to +150 °C operation is mandatory.

Compared with ADUM2402BRWZ and ISO6741QDWR, SI8440BB-D-ISR uniquely balances 150 Mbps speed, 2.7–5.5 V dual-supply flexibility, and AEC-Q100 Grade 1 qualification - making it optimal for next-generation industrial servo drives and HEV battery monitors where timing precision and supply adaptability are critical.

Availability

SI8440BB-D-ISR is available at Aetrix Electronics and suitable for industrial motor control, isolated data acquisition, and renewable energy inverter designs requiring stable component supply and long-term lifecycle support.

Supply support for SI8440BB-D-ISR 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 industrial automation, automotive electrification, and energy infrastructure - replacing optocouplers with CMOS-based capacitive isolation.

FAQ

What is the maximum data rate supported by the SI8440BB-D-ISR?

The SI8440BB-D-ISR supports a maximum data rate of 150 Mbps, verified across its full operating temperature range (–40 °C to +125 °C) and supply voltage range (2.70–5.5 V). This performance is specified for the "Bx" variant in the Si844x family and confirmed in Tables 3–5 of the official Skyworks datasheet Rev. 1.7. SI8440BB-D-ISR achieves this rate with <9.5 ns worst-case propagation delay and <2.5 ns pulse width distortion.

Does the SI8440BB-D-ISR require external components for basic operation?

No, the SI8440BB-D-ISR requires only VDD bypass capacitors (0.1 µF ceramic recommended per supply pin) for stable operation - no external resistors, transformers, or initialization firmware are needed. Its capacitive isolation architecture eliminates start-up delays, and the enable inputs (EN1/EN2) are optional for power-gating. SI8440BB-D-ISR is fully functional immediately after power application, with valid output within 40 µs.

What safety certifications apply to the SI8440BB-D-ISR?

The SI8440BB-D-ISR 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 certifications cover the 2.5 kV_RMS isolation rating and are validated for the wide-body SOIC package used in SI8440BB-D-ISR. Regulatory test data is documented in Skyworks' certification files E257455 (UL), 232873 (CSA), and 5006301-4880-0001 (VDE).

How does the SI8440BB-D-ISR handle supply voltage mismatch between input and output sides?

The SI8440BB-D-ISR supports independent 2.70–5.5 V supplies on VDD1 (input side) and VDD2 (output side), enabling seamless level shifting - for example, 3.3 V MCU logic to 5 V PLC I/O. Input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive strength (VOH ≥ VDD–0.4 V, VOL ≤ 0.4 V) are guaranteed across the full voltage range. SI8440BB-D-ISR maintains timing specs and isolation integrity regardless of VDD1/VDD2 combination.

Is the SI8440BB-D-ISR suitable for automotive applications?

Yes, the SI8440BB-D-ISR is AEC-Q100 qualified (Grade 1, –40 °C to +125 °C) and used in hybrid electric vehicle subsystems including battery management system (BMS) monitoring and traction inverter current sensing. Its 2.5 kV_RMS isolation, 25 kV/µs CMTI, and 60-year lifetime at rated voltage meet stringent automotive reliability requirements. SI8440BB-D-ISR appears in Skyworks' automotive-grade ordering guide with "-Q" suffix variants, confirming its qualification scope.

SI8440BB-D-ISR Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

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:: 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-SOIC

SI8440BB-D-ISR FAQ

1.How can I place an order for SI8440BB-D-ISR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8440BB-D-ISR 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 SI8440BB-D-ISR reliable?

The price and inventory of SI8440BB-D-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8440BB-D-ISR is usually 5 days.

3.What payment methods are accepted for SI8440BB-D-ISR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8440BB-D-ISR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8440BB-D-ISR?

SI8440BB-D-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8440BB-D-ISR 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 SI8440BB-D-ISR?

For technical support, including SI8440BB-D-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8440BB-D-ISR requirements.

6.How does Aetrix verify that SI8440BB-D-ISR is sourced from the original manufacturer or authorized distributors?

All SI8440BB-D-ISR 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 SI8440BB-D-ISR meets industry standards.

7.What is the process for return or replacement of SI8440BB-D-ISR?

All SI8440BB-D-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8440BB-D-ISR, 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 SI8440BB-D-ISR part is unused and in its original packaging.

Return procedure for SI8440BB-D-ISR:

1.Submit a request within 90 days.

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

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