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Skyworks Solutions Inc. SI8431BB-D-IS1
- Part No.:
- SI8431BB-D-IS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8431BB-D-IS1.pdf
- Description:
- DGTL ISO 2500VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,386
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Product details
Overview
SI8431BB-D-IS1 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 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 industrial power systems.
For engineers reviewing the SI8431BB-D-IS1 datasheet, SI8431BB-D-IS1 pinout, SI8431BB-D-IS1 application, or SI8431BB-D-IS1 equivalent, key selection criteria include its 150 Mbps capability, 0.5 ns typical channel-to-channel skew, AEC-Q100 qualification, and reinforced insulation certified to UL, CSA, and VDE standards for safety-critical isolation interfaces.
Technical Context
The SI8431BB-D-IS1 implements capacitive coupling with on-chip RF modulation/demodulation to achieve galvanic isolation across three independent channels. Its architecture supports bidirectional or unidirectional signal transmission per channel, with integrated enable control enabling output tri-state functionality and low-power idle states.
It features dual supply domains (VDD1/VDD2), allowing level-shifting between 2.70 V and 5.5 V logic families, and includes robust CMTI immunity of 25 kV/µs to maintain signal integrity in noisy industrial environments such as inverters and motor drives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 150 Mbps - enables high-speed serial interfaces like isolated SPI, RS-485 transceiver control, and real-time feedback loops. |
| Propagation Delay | 3.0–9.5 ns (typ/max) - ensures tight timing alignment in closed-loop motor control and synchronous ADC sampling. |
| Channel-Channel Skew | 0.5 ns typical - critical for maintaining phase coherence across multiple isolated signals in multi-axis drive systems. |
| Isolation Voltage | 2500 VRMS (1 min) - meets reinforced insulation requirements for industrial mains-connected equipment per IEC 61010-1. |
| Supply Range | 2.70–5.5 V on both sides - supports interoperability between 3.3 V microcontrollers and 5 V analog front-ends without external level shifters. |
| Power @ 100 Mbps | 8.8 mA per channel (VDD = 5 V) - reduces thermal load and simplifies power budgeting in compact, fanless industrial controllers. |
| CMTI | 25 kV/µs - prevents false triggering during fast-switching events in SiC/GaN-based inverters and power converters. |
Pinout & Package
SI8431BB-D-IS1 is housed in a 16-pin wide-body SOIC package (WB SOIC-16), providing 8.0 mm creepage and clearance for reinforced insulation compliance. Pin assignments follow standard Si843x triple-channel layout with independent input/output pairs and shared enable control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Input Channels A–D (A/B/C used) | Three dedicated unidirectional input pins for primary-side logic signals; pin 4 unused in triple-channel configuration. |
| 5, 6, 7, 8 | GND1 / VDD1 / EN1 / GND1 | VDD1 powers primary side; EN1 globally enables/disables all three outputs; GND1 is primary-side reference. |
| 9, 10, 11, 12 | Output Channels A–D (A/B/C used) | Three isolated output pins corresponding to inputs 1–3; pin 12 unused. |
| 13, 14, 15, 16 | GND2 / VDD2 / EN2 / GND2 | VDD2 powers secondary side; EN2 is not connected (EN1 controls both sides); GND2 is secondary-side reference. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-channel isolation | Three independent, reinforced-isolation signal paths in one package - reduces component count and PCB area vs. discrete optocouplers. |
| No start-up initialization | Valid output within 40 µs of power application - eliminates boot-time delays in safety-critical power-on sequencing. |
| Ultra-low power at high speed | <8.8 mA per channel at 100 Mbps (5 V) - enables thermally constrained designs such as enclosed PLC modules and battery-backed gate drivers. |
| AEC-Q100 qualified | Rated for automotive-grade temperature range (–40 °C to +125 °C at 150 Mbps) - supports hybrid electric vehicle traction inverter monitoring. |
| High CMTI immunity | 25 kV/µs common-mode transient rejection - maintains data integrity during fast dv/dt switching in SiC-based motor drives. |
Applications
| Industrial Motor Control | Isolated Switch-Mode Power Supply |
|---|---|
Use Scenario: Isolating PWM gate-drive signals and current-sense feedback in 3-phase inverter stacks. IC Role / Device Role / Timing Role: SI8431BB-D-IS1 provides three synchronized, low-skew isolated channels for upper/lower gate control and analog-to-digital converter isolation. Use Value: Enables precise dead-time management and fault reporting with sub-nanosecond skew, improving inverter efficiency and reliability. |
Use Scenario: Isolating feedback signals (voltage, current, temperature) from secondary to primary side in LLC resonant converters. IC Role / Device Role / Timing Role: SI8431BB-D-IS1 transmits error amplifier output and overcurrent flags across isolation barrier with <10 ns delay. Use Value: Supports fast-loop regulation and cycle-by-cycle protection without compromising safety certification or adding external RC filters. |
| Hybrid Electric Vehicle Traction Inverter | Programmable Logic Controller I/O Module |
Use Scenario: Isolating MCU command signals and resolver/sensor feedback in high-voltage traction inverters. IC Role / Device Role / Timing Role: SI8431BB-D-IS1 delivers AEC-Q100-compliant isolation for gate driver enable, fault status, and position encoder interface. Use Value: Meets automotive functional safety requirements while enabling 150 Mbps sensor data streaming for predictive torque control. |
Use Scenario: Providing isolated digital input/output channels for field-device interfacing in modular PLC backplanes. IC Role / Device Role / Timing Role: SI8431BB-D-IS1 isolates three discrete I/O lines (e.g., emergency stop, limit switch, actuator enable) with independent ground domains. Use Value: Eliminates ground loop noise and enables hot-swap compatibility across mixed-voltage field buses (24 V DC, 48 V DC). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM131BBRZ | 3-channel, 100 Mbps max, 2500 VRMS, SOIC-16 narrow body; higher 12 ns propagation delay; no AEC-Q100 rating. | Better suited for cost-sensitive industrial automation where automotive qualification is unnecessary. | Select ADUM131BBRZ when board space is constrained (narrow-body footprint) and 100 Mbps suffices. |
| ISO6731RWER | 3-channel, 50 Mbps max, 5000 VRMS, SOIC-16 wide body; lower power at low speeds; VDE-reinforced certification only. | Preferred for high-isolation-voltage medical or test equipment where speed is secondary to creepage margin. | Choose ISO6731RWER when >3000 VRMS working voltage or enhanced partial discharge performance is required. |
Compared with ADUM131BBRZ and ISO6731RWER, SI8431BB-D-IS1 uniquely balances 150 Mbps speed, AEC-Q100 qualification, and 2500 VRMS isolation in a wide-body SOIC - making it optimal for next-generation EV inverters and high-bandwidth industrial servo drives.
Availability
SI8431BB-D-IS1 is available at Aetrix Electronics and suitable for industrial motor control, hybrid electric vehicle traction systems, and isolated switch-mode power supplies requiring stable component supply and long-term lifecycle support.
Supply support for SI8431BB-D-IS1 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 high-reliability applications.
The SI8431BB-D-IS1 belongs to Skyworks' Si84xx ultra-low-power digital isolator family, designed specifically for replacing optocouplers in demanding industrial, automotive, and energy infrastructure systems where speed, precision, and safety certification are critical.
FAQ
What is the maximum data rate supported by the SI8431BB-D-IS1?
The SI8431BB-D-IS1 supports a maximum data rate of 150 Mbps under specified conditions (VDD = 5 V, TA = –40 °C to +125 °C). This is confirmed in Table 3's timing characteristics for Si843xBx variants, and applies directly to the SI8431BB-D-IS1 as a "B" speed grade device. Performance remains stable across its full operating temperature and voltage range.
Does the SI8431BB-D-IS1 require external bypass capacitors?
Yes - the SI8431BB-D-IS1 requires local 0.1 µF ceramic bypass capacitors placed close to each VDD pin (VDD1 and VDD2) as stated in the datasheet's layout recommendations and functional description. These capacitors stabilize supply rails and suppress high-frequency noise, ensuring reliable operation at 150 Mbps and maintaining CMTI performance.
Is the SI8431BB-D-IS1 pin-compatible with other Si843x variants?
No - the SI8431BB-D-IS1 shares the same 16-pin wide-body SOIC package and pinout as other Si843x triple-channel devices (e.g., SI8431AB-D-IS1), but differs in speed grade ("B" vs. "A") and internal revision (Revision D). Electrical behavior, timing, and enable functionality match the Si8431Bx specification, not the slower Si8431Ax variant.
What safety certifications does the SI8431BB-D-IS1 hold?
The SI8431BB-D-IS1 is certified to UL 1577 (2500 VRMS), CSA Component Acceptance Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2. These cover reinforced insulation for industrial and automotive applications, with production-tested isolation up to 3000 VRMS for 1 second and rated working voltage of 560 Vpeak per IEC 60747-5-2.
Can the SI8431BB-D-IS1 operate with different supply voltages on each side?
Yes - the SI8431BB-D-IS1 supports independent 2.70–5.5 V supplies on VDD1 and VDD2, enabling true level-shifting between disparate logic families (e.g., 3.3 V MCU to 5 V gate driver). This is explicitly defined in Table 1 (Recommended Operating Conditions) and verified across all electrical characterization tables for 2.7 V, 3.3 V, and 5 V operation.
SI8431BB-D-IS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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-IS1 FAQ
1.How can I place an order for SI8431BB-D-IS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8431BB-D-IS1 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-IS1 reliable?
The price and inventory of SI8431BB-D-IS1 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-IS1 is usually 5 days.
3.What payment methods are accepted for SI8431BB-D-IS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8431BB-D-IS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8431BB-D-IS1?
SI8431BB-D-IS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8431BB-D-IS1 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-IS1?
For technical support, including SI8431BB-D-IS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8431BB-D-IS1 requirements.
6.How does Aetrix verify that SI8431BB-D-IS1 is sourced from the original manufacturer or authorized distributors?
All SI8431BB-D-IS1 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-IS1 meets industry standards.
7.What is the process for return or replacement of SI8431BB-D-IS1?
All SI8431BB-D-IS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8431BB-D-IS1, 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-IS1 part is unused and in its original packaging.
Return procedure for SI8431BB-D-IS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8431BB-D-IS1 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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