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Skyworks Solutions Inc. SI8431BB-D-ISR
- Part No.:
- SI8431BB-D-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8431BB-D-ISR.pdf
- Description:
- DGTL ISO 2500VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,874
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Product details
Overview
SI8431BB-D-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 2.5 kVRMS reinforced isolation. It operates from 2.70–5.5 V on both sides, delivers <8.8 mA per channel at 100 Mbps (5 V), and targets isolated communication in motor control and power inverters.
For engineers reviewing the SI8431BB-D-ISR datasheet, SI8431BB-D-ISR pinout, SI8431BB-D-ISR application, or SI8431BB-D-ISR equivalent, this page provides verified timing specs, safety certifications (UL, CSA, VDE), supply current behavior across voltage/frequency, and validated alternative options for industrial and automotive-grade isolation designs.
Technical Context
The SI8431BB-D-ISR implements capacitive isolation with on-chip RF modulation/demodulation, enabling DC-to-150 Mbps signal transmission without start-up initialization. Its dual-supply architecture supports independent 2.70–5.5 V operation on primary and secondary sides, with precise timing control yielding ≤1.8 ns channel-channel skew and ≤3.0 ns propagation delay skew (typical).
It features integrated enable inputs per channel pair, delivering 5–8 ns enable-to-data-valid response, and meets AEC-Q100 Grade 0 (–40 to +125 °C) with 25 kV/µs common-mode transient immunity. Safety isolation is certified to UL 1577 (2500 VRMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 (560 Vpeak working 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 isolated ADC/DAC links without oversampling or external clocking. |
| Propagation Delay | 3.0–9.5 ns (max) - enables sub-10 ns timing-critical feedback loops in motor gate drivers and digital power controllers. |
| Supply Current @ 100 Mbps | 8.8 mA per channel (5 V) - reduces thermal load in densely packed isolated power supplies and EV traction inverters. |
| Isolation Voltage | 2500 VRMS (1 min) - meets reinforced insulation requirements for industrial mains-connected systems and hybrid vehicle battery management. |
| Operating Temperature | –40 to +125 °C - qualified for under-hood automotive and industrial ambient environments without derating. |
| Common-Mode Transient Immunity | 25 kV/µs - maintains signal integrity during fast-switching events in SiC/GaN-based inverters and motor drives. |
| Channel-Channel Skew | ≤1.8 ns (max) - ensures synchronized sampling across multiple isolated analog channels in multi-phase motor control. |
Pinout & Package
SI8431BB-D-ISR is housed in a 16-pin wide-body SOIC package (package outline per Skyworks Doc Rev. 1.7, p.28), providing 8.0 mm minimum creepage and clearance for reinforced insulation compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Primary-side inputs/outputs/enable | Pins 1–3: Channel A/B/C inputs (IN1/IN2/IN3); Pins 4–6: corresponding outputs (OUT1/OUT2/OUT3); Pins 7–8: EN1/EN2 enable controls for channel pairs. |
| 9, 10, 11, 12, 13, 14, 15, 16 | Secondary-side inputs/outputs/enable | Pins 9–11: Isolated outputs/inputs (OUT1/OUT2/OUT3 or IN1/IN2/IN3 depending on direction); Pins 12–13: VDD2 power; Pins 14–16: GND2, EN1B, EN2B - supports bidirectional or unidirectional configuration per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-channel isolation | Three independent galvanic barriers in one package - reduces BOM count and PCB area vs. discrete optocoupler solutions in 3-phase motor control. |
| Ultra-low power at high speed | <8.8 mA per channel at 100 Mbps (5 V) - enables energy-efficient isolation in battery-powered and thermally constrained systems. |
| Sub-10 ns timing precision | Worst-case propagation delay ≤9.5 ns, skew ≤1.8 ns - supports real-time closed-loop control in digital power converters and servo drives. |
| Reinforced safety certification | UL 1577 (2500 VRMS), CSA 60950-1/61010-1, VDE IEC 60747-5-2 - eliminates need for external safety components in medical, industrial, and automotive applications. |
| AEC-Q100 qualified | Grade 0 (–40 to +125 °C) - validated for use in hybrid electric vehicle powertrain subsystems including onboard chargers and DC-DC converters. |
Applications
| Industrial Motor Control | Isolated Switch-Mode Power Supply |
|---|---|
Use Scenario: Gate driving for three-phase IGBT/SiC modules in variable-frequency drives. IC Role / Device Role / Timing Role: Isolates PWM signals from MCU to gate driver ICs while preserving edge timing accuracy and noise immunity. Use Value: Enables <9.5 ns propagation delay and ≤1.8 ns channel skew to synchronize phase-leg switching, reducing torque ripple and EMI. |
Use Scenario: Feedback path isolation in isolated DC-DC converters for telecom and server PSUs. IC Role / Device Role / Timing Role: Transmits error amplifier output or digital control signals across isolation barrier with minimal latency. Use Value: Delivers 25 kV/µs CMTI and <8.8 mA/channel current draw at 100 Mbps, improving regulation stability and thermal efficiency. |
| Hybrid Electric Vehicle Inverter | Isolated Data Acquisition |
Use Scenario: Signal isolation between vehicle controller and traction inverter's high-voltage domain. IC Role / Device Role / Timing Role: Carries fault status, temperature telemetry, and gate command signals across reinforced barrier. Use Value: AEC-Q100 Grade 0 qualification and 2500 VRMS rating ensure reliability in high-vibration, high-temperature EV powertrain environments. |
Use Scenario: Isolating SPI interface between microcontroller and isolated ADC in industrial process monitoring. IC Role / Device Role / Timing Role: Transfers sampled sensor data across isolation boundary with deterministic latency and no bit errors. Use Value: 150 Mbps capability supports high-resolution, multi-channel ADC streaming without protocol overhead or frame buffering. |
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, 50 Mbps max, 100 ns propagation delay, 2.5 kVRMS (SOIC-16WB) | Limited to lower-speed control loops; higher latency unsuitable for >20 kHz PWM systems | Choose when only quad-channel count matters and data rate ≤50 Mbps suffices. |
| ISO6731FDWR | Triple-channel, 50 Mbps, 11 ns propagation delay, 5 kVRMS (SOIC-16WB), 3.0–5.5 V supply | Higher isolation rating but lower speed and higher quiescent current (12 mA @ 100 Mbps not supported) | Prefer for mains-connected equipment requiring >3.75 kVRMS working voltage, accepting bandwidth trade-off. |
Compared with ADUM3401BRWZ and ISO6731FDWR, SI8431BB-D-ISR uniquely balances 150 Mbps bandwidth, sub-10 ns timing, and AEC-Q100 qualification-making it optimal for high-performance motor control and EV inverter designs where speed, precision, and automotive reliability converge.
Availability
SI8431BB-D-ISR 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 across extended product lifecycles.
Supply support for SI8431BB-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 SI8431BB-D-ISR belongs to Skyworks' Si84xx family of capacitive digital isolators, engineered for high-speed, low-power, and safety-certified signal transfer in industrial automation, automotive electrification, and energy infrastructure.
FAQ
What is the maximum data rate supported by SI8431BB-D-ISR?
The SI8431BB-D-ISR supports a maximum data rate of 150 Mbps under specified conditions (VDD = 5 V, TA = –40 to +125 °C, CL = 15 pF). This is confirmed in Table 3 of the Skyworks datasheet Rev. 1.7, where Si8431Bx variants are explicitly rated for 0–150 Mbps operation with 6 ns minimum pulse width.
Does SI8431BB-D-ISR require external startup initialization?
No, SI8431BB-D-ISR does not require external startup initialization. As stated in the "Features" section of the datasheet, it operates with "No start-up initialization required," enabling immediate data transmission after power-on, with a typical start-up time of 15–40 µs.
What safety certifications apply to SI8431BB-D-ISR?
SI8431BB-D-ISR holds UL 1577 recognition (2500 VRMS, 1 minute), CSA Component Notice 5A (IEC 60950-1 and 61010-1), and VDE IEC 60747-5-2 certification. These are documented in Tables 6 and 7 of the datasheet and apply specifically to the 2.5 kVRMS-rated devices, including SI8431BB-D-ISR.
Is SI8431BB-D-ISR suitable for automotive applications?
Yes, SI8431BB-D-ISR is AEC-Q100 qualified (Grade 0, –40 to +125 °C), making it suitable for automotive applications such as hybrid electric vehicle inverters and onboard chargers. The datasheet explicitly lists "Hybrid electric vehicles" under Applications and confirms qualification in the Features section.
What is the supply voltage range for SI8431BB-D-ISR on each side?
SI8431BB-D-ISR supports independent supply voltages of 2.70–5.5 V on both primary (VDD1) and secondary (VDD2) sides, as specified in Table 1 ("Recommended Operating Conditions") of the datasheet. This dual-supply flexibility allows interfacing with 3.3 V and 5 V logic domains simultaneously.
SI8431BB-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:
- 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-D-ISR FAQ
1.How can I place an order for SI8431BB-D-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8431BB-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 SI8431BB-D-ISR reliable?
The price and inventory of SI8431BB-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 SI8431BB-D-ISR is usually 5 days.
3.What payment methods are accepted for SI8431BB-D-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8431BB-D-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8431BB-D-ISR?
SI8431BB-D-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8431BB-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 SI8431BB-D-ISR?
For technical support, including SI8431BB-D-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8431BB-D-ISR requirements.
6.How does Aetrix verify that SI8431BB-D-ISR is sourced from the original manufacturer or authorized distributors?
All SI8431BB-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 SI8431BB-D-ISR meets industry standards.
7.What is the process for return or replacement of SI8431BB-D-ISR?
All SI8431BB-D-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8431BB-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 SI8431BB-D-ISR part is unused and in its original packaging.
Return procedure for SI8431BB-D-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8431BB-D-ISR 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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