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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8431BB-C-ISR

Name: SI8431BB-C-ISR
Brand: Skyworks Solutions Inc.
SKU: SI8431BB-C-ISR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8431BB-C-ISR

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8431BB-C-ISR.pdf

Description:: IC ISOLATOR 3CH 5.5V 16-SOIC

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Product details

Overview

SI8431BB-C-ISR from Skyworks Solutions is a triple-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 2500 VRMS isolation. It operates across 2.70–5.5 V supply rails and delivers <8.8 mA per channel at 100 Mbps (5 V), enabling high-speed signal isolation in motor control and isolated power supplies.

For engineers reviewing the SI8431BB-C-ISR datasheet, SI8431BB-C-ISR pinout, SI8431BB-C-ISR application, or SI8431BB-C-ISR equivalent, this page provides verified timing specs, safety certifications (UL, CSA, VDE), channel-channel skew (≤1.8 ns), and precise enable-to-data timing (5–8 ns) critical for real-time industrial and automotive isolation design.

Technical Context

The SI8431BB-C-ISR implements capacitive CMOS isolation with three independent bidirectional channels, each featuring integrated 85 Ω output impedance and support for DC–150 Mbps operation. Its architecture eliminates start-up initialization and maintains stable timing over –40 to +125 °C ambient temperature at full data rate.

It incorporates an active enable input per side (EN1/EN2), enabling tri-state output control with 5–8 ns enable-to-data valid and 7–9.2 ns enable-to-tri-state delays. Safety compliance includes reinforced insulation per IEC 60950-1/61010-1 and VDE 0884-2, with 560 V_PEAK working voltage and 3600 V_RMS maximum isolation test voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	Up to 150 Mbps - supports high-speed serial interfaces like SPI, RS-485, and CAN FD without external buffering.
Propagation Delay	3.0–9.5 ns (typ/max) - enables sub-10 ns timing-critical feedback loops in motor gate drivers and ADC sampling systems.
Channel-Channel Skew	≤1.8 ns (max) - ensures synchronized multi-channel sampling or PWM edge alignment across isolated domains.
Supply Voltage Range	2.70–5.5 V on both sides - allows interoperability with 3.3 V microcontrollers and 5 V legacy logic without level shifters.
Isolation Rating	2500 V_RMS for 1 minute - certified for reinforced insulation in industrial PLCs and EV battery management systems.
CMTI	25 kV/µs (min) - rejects fast common-mode transients in noisy motor drive and inverter environments.
Power Consumption	7.0–8.8 mA per channel at 100 Mbps (5 V) - reduces thermal load in densely packed isolated power supply controllers.

Pinout & Package

SI8431BB-C-ISR uses a 16-pin wide-body SOIC package (package outline per Skyworks Doc Rev. 1.7, p.28), with creepage/clearance of 8.0 mm and 10¹² Ω input-output resistance. Pin functions are validated per datasheet Section 4 (Pin Descriptions) and Figure 1–2.

Pin/Terminal	Circuit Role	Design Meaning
VDD1, VDD2	Primary and secondary side supply pins	Independent 2.7–5.5 V rails enable asymmetric voltage operation (e.g., 3.3 V MCU side / 5 V analog side).
GND1, GND2	Primary and secondary ground references	Galvanically isolated grounds maintain noise immunity between domains; no shared reference required.
IN1–IN3	Input signals to primary-side isolation barrier	Accept TTL/CMOS logic levels; VIH ≥2.0 V, VIL ≤0.8 V - compatible with most microcontrollers and FPGAs.
OUT1–OUT3	Output signals from secondary-side isolation barrier	Drive loads up to 4 mA at VOL ≤0.4 V; 85 Ω nominal output impedance supports controlled-impedance PCB routing.
EN1, EN2	Enable inputs for primary and secondary sides	Active-high control: outputs go high-impedance when respective EN is low - enables dynamic channel gating in power sequencing.
NC	No-connect pins (pins 4, 5, 12, 13)	Internally unused; must remain unconnected per datasheet - avoids unintended coupling or EMI paths.

Key Features

Feature	Design Value
Triple-channel isolation	Three independent, bidirectional data paths in one SOIC-16 package - reduces board space vs. discrete optocouplers or dual isolators.
Ultra-low power at speed	8.8 mA max per channel at 100 Mbps (5 V) - cuts isolation-related power by >50% vs. legacy opto-isolators at same data rate.
Precision timing	1.5 ns pulse width distortion and 0.5 ns typical channel-channel skew - preserves signal integrity in high-resolution encoder or PWM applications.
AEC-Q100 qualified	Grade 1 (–40 to +125 °C) qualification - validates reliability for hybrid electric vehicle traction inverters and onboard chargers.
RoHS-compliant wide-body SOIC	16-pin wide-body SOIC with 8.0 mm creepage - meets IPC-2221B spacing requirements for 600 V_RMS working voltage systems.

Applications

Industrial Motor Control	Isolated Switch-Mode Power Supply
Use Scenario: Isolating gate driver signals and current-sense feedback in 3-phase IGBT/SiC inverter stages. IC Role / Device Role / Timing Role: SI8431BB-C-ISR provides three isolated channels: two for complementary PWM outputs and one for isolated current-sense ADC data. Use Value: Sub-10 ns propagation delay and ≤1.8 ns channel skew ensure precise dead-time control and prevent shoot-through in high-frequency switching.	Use Scenario: Providing isolated feedback for secondary-side voltage regulation and primary-side controller communication in LLC resonant converters. IC Role / Device Role / Timing Role: SI8431BB-C-ISR isolates error amplifier output, synchronous rectifier control, and fault reporting signals across transformer boundary. Use Value: 25 kV/µs CMTI and 2500 V_RMS rating withstand fast transients during load steps and short circuits.
Hybrid Electric Vehicle Battery Management	Industrial PLC Digital I/O Modules
Use Scenario: Isolating cell voltage monitoring, contactor control, and thermal sensor data between high-voltage battery pack and low-voltage MCU domain. IC Role / Device Role / Timing Role: SI8431BB-C-ISR routes three independent signals: pack voltage sense, precharge relay command, and fault status flag. Use Value: AEC-Q100 Grade 1 qualification and 60-year life at rated voltage ensure long-term reliability in automotive under-hood environments.	Use Scenario: Galvanically isolating digital input/output lines in programmable logic controller backplanes to prevent ground loop interference and surge damage. IC Role / Device Role / Timing Role: SI8431BB-C-ISR isolates three discrete I/O channels - e.g., emergency stop input, solenoid output, and status LED drive. Use Value: UL/CSA/VDE safety certification enables direct use in Class 1 Div 2 hazardous location equipment without additional system-level testing.

Industrial Motor Control

Isolated Switch-Mode Power Supply

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

IC Role / Device Role / Timing Role: SI8431BB-C-ISR provides three isolated channels: two for complementary PWM outputs and one for isolated current-sense ADC data.

Use Value: Sub-10 ns propagation delay and ≤1.8 ns channel skew ensure precise dead-time control and prevent shoot-through in high-frequency switching.

Use Scenario: Providing isolated feedback for secondary-side voltage regulation and primary-side controller communication in LLC resonant converters.

IC Role / Device Role / Timing Role: SI8431BB-C-ISR isolates error amplifier output, synchronous rectifier control, and fault reporting signals across transformer boundary.

Use Value: 25 kV/µs CMTI and 2500 V_RMS rating withstand fast transients during load steps and short circuits.

Hybrid Electric Vehicle Battery Management

Industrial PLC Digital I/O Modules

Use Scenario: Isolating cell voltage monitoring, contactor control, and thermal sensor data between high-voltage battery pack and low-voltage MCU domain.

IC Role / Device Role / Timing Role: SI8431BB-C-ISR routes three independent signals: pack voltage sense, precharge relay command, and fault status flag.

Use Value: AEC-Q100 Grade 1 qualification and 60-year life at rated voltage ensure long-term reliability in automotive under-hood environments.

Use Scenario: Galvanically isolating digital input/output lines in programmable logic controller backplanes to prevent ground loop interference and surge damage.

IC Role / Device Role / Timing Role: SI8431BB-C-ISR isolates three discrete I/O channels - e.g., emergency stop input, solenoid output, and status LED drive.

Use Value: UL/CSA/VDE safety certification enables direct use in Class 1 Div 2 hazardous location equipment without additional system-level testing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM1311BRWZ	3-channel, 100 Mbps max, 35 ns max propagation delay, 2500 V_RMS isolation, SOIC-16 wide body	Limited to 100 Mbps and higher propagation delay - unsuitable for 150 Mbps SPI or fast PWM edge alignment	Select ADUM1311BRWZ only if data rate ≤100 Mbps and CMTI ≥15 kV/µs suffices; verify layout for 35 ns skew budget.
ISO6731FDWR	3-channel, 50 Mbps max, 16 ns max propagation delay, 5000 V_RMS isolation, SOIC-16 wide body	Higher isolation rating but lower speed - better for high-voltage medical or test equipment, not motor control	Choose ISO6731FDWR where 5000 V_RMS isolation is mandatory and 50 Mbps suffices; avoid for 150 Mbps industrial comms.

Compared with ADUM1311BRWZ and ISO6731FDWR, SI8431BB-C-ISR uniquely balances 150 Mbps speed, <10 ns delay, and 2500 V_RMS isolation in a single wide-body SOIC, making it optimal for space-constrained, high-speed industrial and automotive isolation where timing precision and power efficiency are critical.

Availability

SI8431BB-C-ISR is available at Aetrix Electronics and suitable for industrial motor control, isolated switch-mode power supplies, and hybrid electric vehicle battery management systems requiring stable component supply and long-lifecycle support.

Supply support for SI8431BB-C-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 for high-reliability, low-power digital signal isolation in industrial automation, automotive electrification, and energy infrastructure - emphasizing speed, timing accuracy, and safety certification out-of-the-box.

FAQ

What is the maximum operating temperature for SI8431BB-C-ISR at 150 Mbps?

The SI8431BB-C-ISR is rated for –40 to +125 °C ambient temperature while maintaining full 150 Mbps operation, as confirmed in Table 1 (Recommended Operating Conditions) and validated across both 3.3 V and 5 V supply conditions. This range applies to the wide-body SOIC package and supports deployment in under-hood automotive and industrial cabinet environments.

Does SI8431BB-C-ISR require external bypass capacitors?

Yes - SI8431BB-C-ISR requires 0.1 µF ceramic bypass capacitors placed close to each VDD pin (VDD1 and VDD2) to ensure stable operation and meet specified timing and noise immunity performance. The datasheet explicitly states "only VDD bypass capacitors are required" and cites layout recommendations in Section 2.4.

How does the enable function work on SI8431BB-C-ISR?

SI8431BB-C-ISR features two independent enable inputs: EN1 controls outputs driven from the primary side (IN1–IN3), and EN2 controls outputs driven from the secondary side. When either EN is low, its associated outputs enter high-impedance state within 7–9.2 ns (ten2), enabling dynamic channel shutdown without affecting the opposite side's operation.

Is SI8431BB-C-ISR pin-compatible with other Si843x variants?

No - SI8431BB-C-ISR is not pin-compatible with Si8430 or Si8435 variants due to differing internal enable logic and channel configurations. Specifically, Revision C devices (like SI8431BB-C-ISR) cause outputs to go low when EN is inactive, whereas earlier revisions behave differently. Always consult the Errata section (p.24) before substitution.

What safety certifications apply to SI8431BB-C-ISR?

SI8431BB-C-ISR carries UL 1577 (2500 V_RMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE 0884-2 (IEC 60747-5-2) certifications. These cover reinforced insulation up to 560 V_PEAK working voltage and are production-tested to 3000 V_RMS for 1 second, as documented in Tables 6 and 7 of the datasheet.

SI8431BB-C-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:: 3

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

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

SI8431BB-C-ISR FAQ

1.How can I place an order for SI8431BB-C-ISR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8431BB-C-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 SI8431BB-C-ISR reliable?

The price and inventory of SI8431BB-C-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8431BB-C-ISR is usually 5 days.

3.What payment methods are accepted for SI8431BB-C-ISR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8431BB-C-ISR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8431BB-C-ISR?

SI8431BB-C-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8431BB-C-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 SI8431BB-C-ISR?

For technical support, including SI8431BB-C-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8431BB-C-ISR requirements.

6.How does Aetrix verify that SI8431BB-C-ISR is sourced from the original manufacturer or authorized distributors?

All SI8431BB-C-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 SI8431BB-C-ISR meets industry standards.

7.What is the process for return or replacement of SI8431BB-C-ISR?

All SI8431BB-C-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8431BB-C-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 SI8431BB-C-ISR part is unused and in its original packaging.

Return procedure for SI8431BB-C-ISR:

1.Submit a request within 90 days.

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

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