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Skyworks Solutions Inc. SI8431BB-C-IS
- Part No.:
- SI8431BB-C-IS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8431BB-C-IS.pdf
- Description:
- DIGITAL ISOLATOR 3CH 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,702
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Product details
Overview
SI8431BB-C-IS from Skyworks Solutions is a triple-channel, ultra-low-power digital isolator in a 16-pin wide-body SOIC package, delivering 150 Mbps data rate, <9.5 ns worst-case propagation delay, and 2500 VRMS reinforced isolation. It operates across 2.70–5.5 V supply rails and supports industrial motor control, isolated ADC interfaces, and hybrid electric vehicle power inverters.
For engineers reviewing the SI8431BB-C-IS datasheet, SI8431BB-C-IS pinout, SI8431BB-C-IS application, or SI8431BB-C-IS equivalent, key selection criteria include channel count (3), isolation rating (2500 VRMS), timing precision (0.5 ns typical channel-channel skew), low-power operation at 100 Mbps (<13.8 mA total), and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The SI8431BB-C-IS uses capacitive CMOS isolation technology with on-chip RF modulation/demodulation, enabling high-speed signal transfer without magnetic components or external initialization. Its dual-supply architecture (VDD1/VDD2) supports asymmetric voltage operation (e.g., 3.3 V on one side, 5 V on the other) while maintaining precise timing integrity.
All three channels are unidirectional and independently enabled via dedicated ENx pins. The device achieves 25 kV/µs common-mode transient immunity (CMTI) and features integrated output impedance (~85 Ω) optimized for controlled-impedance PCB routing without external termination resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 150 Mbps maximum - supports high-speed serial links in motor control gate drivers and isolated communication buses. |
| Propagation Delay | 3.0–9.5 ns - enables sub-10 ns timing-critical feedback loops in isolated SMPS and real-time ADC sampling systems. |
| Channel-Channel Skew | 0.5 ns typical - ensures synchronized sampling across multiple isolated analog inputs in multi-channel isolated data acquisition. |
| Isolation Voltage | 2500 VRMS (1 min) - certified for reinforced insulation per UL 1577, CSA 5A, and VDE IEC 60747-5-2. |
| Supply Range | 2.70–5.5 V per side - allows interoperability between 3.3 V logic and 5 V legacy systems without level shifters. |
| Power @ 100 Mbps | 7.0–13.8 mA total (VDD1 + VDD2) - reduces thermal load in compact, sealed enclosures for industrial automation modules. |
| CMTI | 25 kV/µs minimum - maintains signal integrity during fast-switching transients in IGBT-based inverters and EV battery management systems. |
Pinout & Package
SI8431BB-C-IS is housed in a 16-pin wide-body SOIC package (WB SOIC-16) with 8.0 mm creepage/clearance, rated for 2500 VRMS isolation. Pin 1 is marked with a dot; pins 1–8 form the primary-side interface, pins 9–16 the secondary-side interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply | Accepts 2.70–5.5 V; powers input-side logic and channel 1 transmitter. |
| GND1 | Primary-side ground | Reference for VDD1 and all primary-side I/O; must be separated from GND2 by isolation barrier. |
| IN1 | Primary-side input 1 | CMOS-compatible digital input driving isolated channel 1; VIH = 2.0 V min, VIL = 0.8 V max. |
| EN1 | Channel 1 enable | Active-high control; outputs go low when disabled - critical for safe shutdown in fault conditions. |
| VDD2 | Secondary-side supply | Independent 2.70–5.5 V rail; powers output-side logic and channel 1 receiver. |
| GND2 | Secondary-side ground | Reference for VDD2 and all secondary-side outputs; galvanically isolated from GND1. |
| OUT1 | Secondary-side output 1 | CMOS output with VOH ≥ VDD2 – 0.4 V, VOL ≤ 0.4 V; drives loads up to 10 mA. |
| EN2 | Channel 2 enable | Active-high enable for channel 2; decouples timing control between isolated signal paths. |
Key Features
| Feature | Design Value |
|---|---|
| No start-up initialization | Valid output within 40 µs of power application - eliminates boot-time delays in safety-critical power-on reset sequences. |
| Pulse width distortion | 1.5 ns typical - preserves duty cycle fidelity for PWM signals in isolated gate driver applications. |
| 60-year life at rated voltage | Guaranteed reliability under continuous 2500 VRMS working stress - suitable for long-lifecycle infrastructure equipment. |
| AEC-Q100 qualified | Grade 1 (–40 to +125 °C) qualification - validated for automotive powertrain and charging systems. |
| RoHS-compliant wide-body SOIC | Lead-free, halogen-free package with 8.0 mm creepage - meets IPC/JEDEC standards for high-voltage industrial assembly. |
Applications
| Industrial Motor Control | Isolated ADC Interface |
|---|---|
|
Use Scenario: Isolating PWM signals and fault feedback between MCU and IGBT gate drivers in variable-frequency drives. IC Role / Device Role / Timing Role: Triple-channel isolator transmitting gate enable, PWM, and overcurrent fault signals across 2500 VRMS barrier with <9.5 ns delay matching. Use Value: Enables precise, synchronized switching of 3-phase inverter legs while preventing ground-loop noise from corrupting control signals. |
Use Scenario: Connecting SAR ADC outputs to isolated microcontroller in high-voltage battery monitoring systems. IC Role / Device Role / Timing Role: Transmitting parallel ADC data bits and conversion-ready strobe across isolation barrier with 0.5 ns channel-to-channel skew. Use Value: Preserves simultaneous sampling accuracy across multiple battery cell voltages without timing-induced measurement error. |
| Hybrid Electric Vehicle Inverter | Isolated Switch-Mode Power Supply |
|
Use Scenario: Isolating high-side and low-side gate drive signals in traction inverter half-bridges operating at 800 V DC bus. IC Role / Device Role / Timing Role: Providing independent, CMTI-hardened (25 kV/µs) isolation for three phase-leg control signals with matched propagation delay. Use Value: Prevents shoot-through failures during fast dv/dt transients while supporting 150 Mbps diagnostics communication. |
Use Scenario: Isolating feedback signals (voltage, current, temperature) from secondary side to primary-side PWM controller in medical-grade PSUs. IC Role / Device Role / Timing Role: Delivering stable, low-jitter isolated sensing data to maintain ±0.5% output regulation under dynamic load steps. Use Value: Eliminates need for optocoupler aging compensation and enables tighter loop bandwidth for faster transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM3401BRWZ | Quad-channel, 25 Mbps max, 30 ns propagation delay, 2500 VRMS, SOIC-16 wide body | Limited to lower-speed feedback and status signaling; not suitable for 150 Mbps PWM or ADC streaming | Select when cost-sensitive designs require quad-channel density and tolerate higher latency. |
| ISO6731FDWR | Triple-channel, 50 Mbps max, 11 ns propagation delay, 5000 VRMS, SOIC-16 wide body | Higher isolation rating but lower speed; lacks AEC-Q100 qualification and 25 kV/µs CMTI | Prefer for mains-connected industrial equipment requiring 5 kVRMS, where 150 Mbps is unnecessary. |
Compared with ADUM3401BRWZ and ISO6731FDWR, SI8431BB-C-IS uniquely balances 150 Mbps speed, sub-10 ns timing, AEC-Q100 qualification, and 25 kV/µs CMTI - making it optimal for automotive and high-performance industrial inverters where both bandwidth and robustness are non-negotiable.
Availability
SI8431BB-C-IS is available at Aetrix Electronics and suitable for industrial motor control, hybrid electric vehicle inverters, and isolated switch-mode power supplies requiring stable component supply and long-term lifecycle support.
Supply support for SI8431BB-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 automotive, industrial, and energy infrastructure applications - emphasizing low power, precise timing, and regulatory compliance.
FAQ
What is the maximum data rate supported by SI8431BB-C-IS?
The SI8431BB-C-IS supports a maximum data rate of 150 Mbps under specified conditions (VDD = 5 V, TA = –40 to +125 °C, CL = 15 pF). This capability is confirmed in Table 3 of the Skyworks datasheet Rev. 1.7 for the "Si843xBx" variant, which includes SI8431BB-C-IS. Operation above 150 Mbps is not guaranteed and may result in increased bit error rates.
Does SI8431BB-C-IS require external bypass capacitors?
Yes, SI8431BB-C-IS requires 0.1 µF ceramic bypass capacitors placed as close as possible to each VDD pin (VDD1 and VDD2) relative to its respective GND pin (GND1 and GND2). This is explicitly stated in the datasheet's "Features" section and layout recommendations (Section 2.4), and omission risks increased noise susceptibility and timing jitter.
Is SI8431BB-C-IS pin-compatible with other Si843x variants?
SI8431BB-C-IS shares the same 16-pin wide-body SOIC footprint and pinout with all Si843x devices in the WB package, including SI8430 and SI8435 variants. However, channel configuration (e.g., unidirectional vs. bidirectional), enable logic behavior, and timing specs differ - direct substitution requires verification against functional requirements and errata (e.g., Revision C enable behavior).
What safety certifications apply to SI8431BB-C-IS?
SI8431BB-C-IS is certified to UL 1577 (2500 VRMS, 1 min), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2. These certifications are documented in Tables 6 and 7 of the datasheet and apply specifically to the 2.5 kVRMS-rated SI8431BB-C-IS variant in wide-body SOIC packaging.
Can SI8431BB-C-IS operate with different supply voltages on each side?
Yes, SI8431BB-C-IS supports independent supply rails: VDD1 (2.70–5.5 V) and VDD2 (2.70–5.5 V) may be set to different voltages (e.g., 3.3 V on primary, 5 V on secondary). This is confirmed in Table 1 (Recommended Operating Conditions) and enables seamless interfacing between mixed-voltage subsystems without external level shifters.
SI8431BB-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:
- 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-IS FAQ
1.How can I place an order for SI8431BB-C-IS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8431BB-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 SI8431BB-C-IS reliable?
The price and inventory of SI8431BB-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 SI8431BB-C-IS is usually 5 days.
3.What payment methods are accepted for SI8431BB-C-IS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8431BB-C-IS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8431BB-C-IS?
SI8431BB-C-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8431BB-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 SI8431BB-C-IS?
For technical support, including SI8431BB-C-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8431BB-C-IS requirements.
6.How does Aetrix verify that SI8431BB-C-IS is sourced from the original manufacturer or authorized distributors?
All SI8431BB-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 SI8431BB-C-IS meets industry standards.
7.What is the process for return or replacement of SI8431BB-C-IS?
All SI8431BB-C-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8431BB-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 SI8431BB-C-IS part is unused and in its original packaging.
Return procedure for SI8431BB-C-IS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8431BB-C-IS Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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