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Skyworks Solutions Inc. SI8431BB-D-IS
- Part No.:
- SI8431BB-D-IS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8431BB-D-IS.pdf
- Description:
- DGTL ISO 2500VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,336
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Product details
Overview
SI8431BB-D-IS 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 with worst-case propagation delay <9.5 ns, 0.5 ns channel-channel skew, and 25 kV/µs common-mode transient immunity. It operates across 2.7–5.5 V supply rails and delivers <7 mA per channel at 100 Mbps (5 V), enabling high-speed isolated communication in motor control and industrial power inverters.
For engineers reviewing the SI8431BB-D-IS datasheet, SI8431BB-D-IS pinout, SI8431BB-D-IS application, or SI8431BB-D-IS equivalent, this page provides verified electrical specs, safety certifications (UL, CSA, VDE), package dimensions, timing behavior under 2.7 V/3.3 V/5 V operation, and real-world isolation performance metrics for embedded system design validation.
Technical Context
The SI8431BB-D-IS implements capacitive isolation using on-chip RF modulation/demodulation circuitry, eliminating magnetic coupling or optoelectronic elements. Its architecture supports independent bidirectional or unidirectional channel configuration without external components-only VDD bypass capacitors required.
All three channels operate simultaneously with guaranteed timing parameters across –40 °C to +125 °C ambient temperature at full 150 Mbps data rate. The device includes an enable input (EN) that places outputs in high-impedance state within 9.2 ns, supporting dynamic bus control in isolated ADC/DAC interfaces and switch-mode power supply feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 150 Mbps - enables high-resolution encoder feedback and fast SPI isolation in servo drives. |
| Propagation Delay | 3.0–9.5 ns (typ/max) - ensures sub-10 ns timing budget compliance for real-time control loops. |
| Channel-Channel Skew | 0.5 ns (typ) - maintains phase alignment across isolated PWM signals in 3-phase inverter gate drivers. |
| Common-Mode Transient Immunity | 25 kV/µs - sustains signal integrity during fast-switching events in IGBT/MOSFET power stages. |
| Isolation Voltage | 2500 VRMS (1 min) - meets reinforced insulation requirements for industrial mains-connected systems. |
| Supply Voltage Range | 2.70–5.5 V - interoperable with both 3.3 V microcontrollers and 5 V legacy logic families. |
| Power Consumption | <7.0 mA per channel @ 100 Mbps / 5 V - reduces thermal load in densely packed isolated power supplies. |
Pinout & Package
SI8431BB-D-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 assignments follow standard Si843x triple-channel layout with dedicated VDD1/VDD2 supplies, three isolated data channels (A/B/C), and shared enable (EN) control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Primary-side terminals (VDD1, GND1, INx, EN) | VDD1 powers input-side logic; IN1–IN3 accept isolated inputs; EN controls output tri-state. |
| 9, 10, 11, 12, 13, 14, 15, 16 | Secondary-side terminals (VDD2, GND2, OUTx) | VDD2 powers output-side logic; OUT1–OUT3 deliver isolated outputs with 85 Ω nominal impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-channel isolation | Three independent galvanically isolated signal paths in one WB-SOIC-16 package, reducing board space vs. discrete optocouplers. |
| No start-up initialization | Valid output data available within 40 µs of power application - eliminates boot-time delays in safety-critical systems. |
| Precision timing | 1.5 ns pulse width distortion and 2 ns propagation delay skew - preserves signal fidelity in high-speed serial links. |
| AEC-Q100 qualified | Qualified to Grade 1 (–40 °C to +125 °C), supporting use in hybrid electric vehicle battery management and traction inverter control. |
| RoHS-compliant wide-body SOIC | Meets IPC/JEDEC J-STD-020 moisture sensitivity level 3, suitable for lead-free reflow assembly without popcorn risk. |
Applications
| Industrial Motor Control | Isolated Switch-Mode Power Supply |
|---|---|
Use Scenario: Isolating PWM gate drive signals between MCU and 3-phase IGBT inverter stage. IC Role / Device Role / Timing Role: SI8431BB-D-IS transmits three synchronized PWM channels across isolation barrier with <0.5 ns inter-channel skew. Use Value: Enables precise dead-time control and prevents shoot-through faults in high-efficiency motor drives. |
Use Scenario: Providing isolated feedback path from secondary-side voltage/current sensors to primary-side controller. IC Role / Device Role / Timing Role: SI8431BB-D-IS carries analog-to-digital converter outputs across isolation boundary with 25 kV/µs CMTI immunity. Use Value: Maintains regulation accuracy during fast load transients and EMI-rich switching environments. |
| Hybrid Electric Vehicle Inverter | Isolated Data Acquisition System |
Use Scenario: Transmitting resolver excitation and feedback signals in traction motor control units. IC Role / Device Role / Timing Role: SI8431BB-D-IS isolates resolver sine/cosine and reference clock signals with matched propagation delay. Use Value: Preserves angular position resolution and enables SIL-2 functional safety compliance. |
Use Scenario: Isolating SPI interface between host processor and isolated ADC in high-voltage battery monitoring. IC Role / Device Role / Timing Role: SI8431BB-D-IS conveys clock, data, and chip-select signals across 2500 VRMS barrier at 150 Mbps. Use Value: Supports 16-bit ADC sampling at >1 MSPS while meeting IEC 61000-4-5 surge immunity standards. |
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, 30 ns max propagation delay, 2500 VRMS isolation, SOIC-16 wide body | Limited to 100 Mbps; higher timing uncertainty impacts high-frequency PWM fidelity | Preferred where lower data rate suffices and ADI ecosystem integration is prioritized |
| ISO6731FDWR | 3-channel, 50 Mbps max, 2500 VRMS, SOIC-16 wide body, lower power at low speeds | Not suitable for >50 Mbps interfaces like fast SPI or encoder feedback | Selected for cost-sensitive, low-bandwidth industrial I/O modules |
Compared with ADUM1311BRWZ and ISO6731FDWR, SI8431BB-D-IS delivers 50% higher bandwidth and sub-10 ns timing precision-critical for closed-loop motor control and high-speed isolated communications where jitter directly impacts system stability and resolution.
Availability
SI8431BB-D-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-D-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 for wireless, automotive, and industrial markets.
The Si84xx family was designed specifically for high-reliability, high-speed digital isolation in harsh environments-targeting applications demanding low power, precise timing, and certified safety compliance beyond legacy optocoupler limitations.
FAQ
What is the maximum operating temperature for SI8431BB-D-IS at full 150 Mbps data rate?
The SI8431BB-D-IS is fully specified for continuous operation at –40 °C to +125 °C ambient temperature while sustaining 150 Mbps across all three channels. This rating applies under worst-case conditions: 5 V supply, 15 pF load, and all channels active-verified per Table 1 and Figure 2 in the official datasheet Rev. 1.7.
Does SI8431BB-D-IS support independent supply voltages on each side?
Yes, SI8431BB-D-IS supports independent VDD1 (primary side) and VDD2 (secondary side) supplies ranging from 2.70 V to 5.5 V each. This allows interfacing a 3.3 V microcontroller on one side with a 5 V FPGA or gate driver on the other-confirmed in Tables 1, 3, 4, and 5 of the datasheet.
How does the enable (EN) pin function on SI8431BB-D-IS?
The EN pin on SI8431BB-D-IS places all three output channels (OUT1–OUT3) into high-impedance state within 9.2 ns when driven low. When high, outputs reflect input states with typical propagation delay of 6.0 ns. This feature enables dynamic bus sharing and safe startup sequencing in isolated communication interfaces.
Is SI8431BB-D-IS certified for reinforced insulation in industrial equipment?
Yes, SI8431BB-D-IS holds UL 1577 (2500 VRMS), CSA Component Notice 5A (IEC 60950-1/61010-1 reinforced insulation), and VDE IEC 60747-5-2 certifications. These approvals validate its suitability for reinforced insulation in industrial automation systems operating up to 600 VRMS working voltage.
What is the minimum pulse width supported by SI8431BB-D-IS at 150 Mbps?
At 150 Mbps operation, SI8431BB-D-IS supports a minimum pulse width of 6.0 ns (Table 3, "Si843xBx" row). This enables reliable transmission of narrow pulses used in high-resolution encoder index signals and fast fault-clearing commands in power electronics protection circuits.
SI8431BB-D-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-D-IS FAQ
1.How can I place an order for SI8431BB-D-IS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8431BB-D-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-D-IS reliable?
The price and inventory of SI8431BB-D-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-D-IS is usually 5 days.
3.What payment methods are accepted for SI8431BB-D-IS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8431BB-D-IS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8431BB-D-IS?
SI8431BB-D-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8431BB-D-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-D-IS?
For technical support, including SI8431BB-D-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8431BB-D-IS requirements.
6.How does Aetrix verify that SI8431BB-D-IS is sourced from the original manufacturer or authorized distributors?
All SI8431BB-D-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-D-IS meets industry standards.
7.What is the process for return or replacement of SI8431BB-D-IS?
All SI8431BB-D-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8431BB-D-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-D-IS part is unused and in its original packaging.
Return procedure for SI8431BB-D-IS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8431BB-D-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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