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Skyworks Solutions Inc. SI8431BB-D-IS1R
- Part No.:
- SI8431BB-D-IS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8431BB-D-IS1R.pdf
- Description:
- DGTL ISO 2500VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,035
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Product details
Overview
SI8431BB-D-IS1R 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 high-noise industrial motor control and isolated power supply feedback loops.
For engineers reviewing the SI8431BB-D-IS1R datasheet, SI8431BB-D-IS1R pinout, SI8431BB-D-IS1R application, or SI8431BB-D-IS1R equivalent, key selection criteria include channel count, 150 Mbps capability, 2.5 kVRMS safety rating, wide-body SOIC-16 package for creepage/clearance compliance, and AEC-Q100 qualification for automotive subsystems.
Technical Context
The SI8431BB-D-IS1R implements capacitive isolation with on-chip RF modulation/demodulation, enabling DC-to-150 Mbps signal transmission across galvanically isolated boundaries. Its dual-supply architecture supports independent 2.70–5.5 V operation on primary and secondary sides, with precise timing characterized by ≤1.8 ns channel-channel skew and ≤3.0 ns propagation delay skew.
It integrates enable-controlled output tri-state functionality (ten2 ≤9.2 ns), achieves 25 kV/µs common-mode transient immunity, and requires only VDD bypass capacitors-no external transformers, optocoupler biasing, or initialization sequence. Safety certification covers UL 1577 (2500 VRMS), CSA Component Notice 5A, and VDE IEC 60747-5-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 150 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and real-time motor encoder feedback. |
| Propagation Delay | 3.0–9.5 ns - enables tight-timing closed-loop control in inverters and isolated ADC/DAC interfaces without added latency compensation. |
| Isolation Voltage | 2500 VRMS - meets reinforced insulation requirements for industrial mains-connected systems and EV battery management subsystems. |
| Supply Voltage Range | 2.70–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting. |
| Power Consumption | <8.8 mA per channel at 100 Mbps (5 V) - reduces thermal load in densely packed isolated gate drivers and PLC I/O modules. |
| Channel-Channel Skew | ≤1.8 ns - preserves phase alignment across three isolated signals, critical for multi-phase motor commutation timing. |
| Operating Temperature | –40 to +125 °C - qualified for under-hood automotive applications and industrial environments with extended thermal cycling. |
| CMTI | 25 kV/µs - maintains signal integrity during fast-switching events in SiC/GaN-based power converters. |
Pinout & Package
SI8431BB-D-IS1R is housed in a 16-pin wide-body SOIC package (package width ≥10.3 mm), providing 8.0 mm nominal creepage and clearance for 2500 VRMS reinforced insulation compliance per UL, CSA, and VDE standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply | Provides power to input-side logic and isolation transmitter; accepts 2.70–5.5 V with local 0.1 µF bypass. |
| GND1 | Primary-side ground | Reference for input signals and VDD1; must be separated from secondary ground by isolation barrier. |
| EN1 | Primary-side enable | Active-high control: drives outputs low when asserted; enables power-gating of isolated channels during standby. |
| IN1–IN3 | Primary-side digital inputs | Accept CMOS-level signals (VIH ≥2.0 V, VIL ≤0.8 V); no external pull-ups required. |
| VDD2 | Secondary-side supply | Independent 2.70–5.5 V supply for output-side logic and receiver; enables level translation. |
| GND2 | Secondary-side ground | Reference for output signals and VDD2; forms isolated domain with VDD1/GND1. |
| EN2 | Secondary-side enable | Active-high control for secondary outputs; allows local tri-state control independent of primary side. |
| OUT1–OUT3 | Secondary-side digital outputs | CMOS-compatible outputs (VOH ≥VDD2–0.4 V, VOL ≤0.4 V); 85 Ω nominal output impedance for controlled-impedance routing. |
Key Features
| Feature | Design Value |
|---|---|
| No start-up initialization | Delivers valid output within 40 µs of power application - eliminates boot-time delays in safety-critical power-on sequencing. |
| Precision timing | 1.5 ns typical pulse width distortion and 0.5 ns typical channel-channel skew - ensures deterministic timing for synchronous multi-channel isolation. |
| Ultra-low power at speed | 7.0 mA per channel at 100 Mbps (5 V) - enables high-data-rate isolation in thermally constrained enclosures without forced cooling. |
| AEC-Q100 qualification | Qualified to Grade 1 (–40 to +125 °C) - supports deployment in automotive body electronics, battery disconnect units, and onboard chargers. |
| Transient immunity | 25 kV/µs CMTI - prevents false triggering during high-dv/dt switching in 800 V EV traction inverters. |
| RoHS-compliant wide-body SOIC | 16-pin SOIC package with 8.0 mm creepage - satisfies IEC 60664-1 pollution degree 2 requirements for industrial control cabinets. |
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 for HVAC compressors and servo drives. IC Role / Device Role / Timing Role: Triple-channel isolator transmitting complementary high-side/low-side gate signals and analog-to-digital converter status across isolation barrier. Use Value: Enables precise <1.8 ns inter-channel timing alignment for shoot-through prevention and supports 150 Mbps update rates for adaptive dead-time control. | Use Scenario: Providing isolated feedback for voltage regulation and over-current protection in 1–3 kW telecom rectifiers and server PSUs. IC Role / Device Role / Timing Role: Transmitting error amplifier output and fault signals from secondary-side controller to primary-side PWM IC across reinforced insulation barrier. Use Value: Delivers 25 kV/µs CMTI immunity to suppress noise coupling during MOSFET switching transients, ensuring stable regulation under dynamic load steps. |
| Hybrid Electric Vehicle Battery Management | Isolated Data Acquisition Systems |
Use Scenario: Isolating cell voltage monitoring and contactor control signals between high-voltage battery pack (up to 800 VDC) and low-voltage MCU domain. IC Role / Device Role / Timing Role: Three independent isolation channels carrying BMS ADC data, precharge status, and main contactor command with reinforced 2500 VRMS barrier. Use Value: Meets AEC-Q100 Grade 1 and VDE IEC 60747-5-2 requirements for automotive safety-critical subsystems while operating continuously at 125 °C ambient. | Use Scenario: Interfacing isolated sigma-delta ADCs and DACs in programmable logic controller (PLC) analog I/O modules with field-side sensors and actuators. IC Role / Device Role / Timing Role: Transmitting synchronized sample clocks, conversion ready signals, and configuration data across isolation boundary in multi-channel acquisition systems. Use Value: Supports simultaneous sampling of 3 sensor channels with ≤1.8 ns skew, enabling accurate phase-resolved power measurement in energy meters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM131DBRZ | Triple-channel, 150 Mbps, 2.5 kVRMS, SOIC-16 narrow-body (4.01 mm creepage) | Limited to 600 VRMS working voltage per CSA/UL; not AEC-Q100 qualified | Preferred where board space is constrained and 2500 VRMS test voltage is not mandated by end-equipment safety standard. |
| ISO7731FDWR | Triple-channel, 100 Mbps, 5000 VRMS, SOIC-16 wide-body, 3.3/5 V compatible | Lower max data rate; higher isolation rating but larger package footprint and higher quiescent current | Selected when >3000 VRMS withstand is required (e.g., medical or grid-tied solar), accepting 100 Mbps ceiling and higher power budget. |
Compared with ADUM131DBRZ and ISO7731FDWR, SI8431BB-D-IS1R uniquely balances 150 Mbps speed, 2500 VRMS certification in wide-body SOIC, AEC-Q100 qualification, and sub-9 mA/channel consumption at 100 Mbps-making it optimal for space-constrained, high-reliability automotive and industrial inverters.
Availability
SI8431BB-D-IS1R is available at Aetrix Electronics and suitable for industrial motor control, hybrid electric vehicle battery management, and isolated switch-mode power supplies requiring stable component supply and long-term lifecycle support.
Supply support for SI8431BB-D-IS1R 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 harsh electromagnetic environments-targeting industrial automation, automotive electrification, and energy infrastructure applications.
FAQ
What is the maximum data rate supported by SI8431BB-D-IS1R?
The SI8431BB-D-IS1R 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 timing characteristics for Si843xBx variants, and applies directly to the SI8431BB-D-IS1R part number as a B-grade device. Performance remains stable across its full operating temperature and supply voltage range.
Does SI8431BB-D-IS1R require external components for basic operation?
No, SI8431BB-D-IS1R requires only 0.1 µF bypass capacitors on VDD1 and VDD2 pins-no external transformers, optocoupler bias resistors, or initialization firmware. Its capacitive isolation architecture and integrated RF modulation eliminate startup delays, making SI8431BB-D-IS1R operational within 40 µs of power application per datasheet Section 1, Table 3.
What safety certifications does SI8431BB-D-IS1R hold?
SI8431BB-D-IS1R is certified to UL 1577 (2500 VRMS, 1 minute), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2. These apply to the 2.5 kVRMS-rated wide-body SOIC-16 variant and are verified via production testing to 3.0 kVRMS for 1 second, as documented in Tables 6 and 7 of the official Skyworks datasheet Rev. 1.7.
Is SI8431BB-D-IS1R suitable for automotive applications?
Yes, SI8431BB-D-IS1R is AEC-Q100 qualified (Grade 1, –40 to +125 °C) and rated for continuous operation at 125 °C ambient at 150 Mbps. Its 2500 VRMS isolation, 25 kV/µs CMTI, and wide-body SOIC packaging meet requirements for hybrid electric vehicle battery disconnect units, onboard chargers, and traction inverter auxiliary control-per Skyworks' stated applications and qualification documentation.
How does the enable function operate on SI8431BB-D-IS1R?
SI8431BB-D-IS1R features independent EN1 (primary) and EN2 (secondary) inputs. When asserted high, each enable drives its respective output group (OUT1–OUT3 or internal receivers) into a defined low state or tri-state mode within ≤9.2 ns (ten2), as specified in Table 3. This allows dynamic channel gating without disrupting the isolation barrier or requiring cross-domain signaling.
SI8431BB-D-IS1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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-IS1R FAQ
1.How can I place an order for SI8431BB-D-IS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8431BB-D-IS1R 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-IS1R reliable?
The price and inventory of SI8431BB-D-IS1R 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-IS1R is usually 5 days.
3.What payment methods are accepted for SI8431BB-D-IS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8431BB-D-IS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8431BB-D-IS1R?
SI8431BB-D-IS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8431BB-D-IS1R 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-IS1R?
For technical support, including SI8431BB-D-IS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8431BB-D-IS1R requirements.
6.How does Aetrix verify that SI8431BB-D-IS1R is sourced from the original manufacturer or authorized distributors?
All SI8431BB-D-IS1R 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-IS1R meets industry standards.
7.What is the process for return or replacement of SI8431BB-D-IS1R?
All SI8431BB-D-IS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8431BB-D-IS1R, 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-IS1R part is unused and in its original packaging.
Return procedure for SI8431BB-D-IS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8431BB-D-IS1R 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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