My Inquiry
My Account
Skyworks Solutions Inc. SI8431AB-C-IS1
- Part No.:
- SI8431AB-C-IS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8431AB-C-IS1.pdf
- Description:
- DGTL ISO 2500VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,318
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI8431AB-C-IS1 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 SI8431AB-C-IS1 datasheet, SI8431AB-C-IS1 pinout, SI8431AB-C-IS1 application, or SI8431AB-C-IS1 equivalent, this device offers precise timing (0.5 ns channel-channel skew), high CMTI (25 kV/µs), and AEC-Q100 qualification for automotive-grade reliability in safety-critical isolation paths.
Technical Context
The SI8431AB-C-IS1 implements capacitive isolation with on-chip RF modulation/demodulation circuitry, enabling DC-to-150 Mbps signal transmission without start-up initialization. Its dual-supply architecture (VDD1/VDD2) supports asymmetric voltage operation (e.g., 3.3 V on side 1, 5 V on side 2) while maintaining full timing specification compliance.
It features an enable input per side (EN1/EN2) that places outputs in high-impedance state within 9.2 ns, supporting dynamic power gating in isolated gate driver circuits. All channels are independently functional with no inter-channel dependency, and the device achieves 60-year lifetime at rated working voltage under IEC 60747-5-2 certification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 150 Mbps - supports high-speed serial interfaces like isolated SPI, RS-485 transceivers, and PWM feedback in 100 kHz+ switching converters. |
| Propagation Delay | 3.0–9.5 ns - enables sub-10 ns timing-critical applications such as real-time motor phase current sampling and fast-loop digital power control. |
| Channel-Channel Skew | 0.5 ns typical - ensures synchronized multi-channel signal transfer for three-phase motor control encoder or resolver interfaces. |
| Isolation Voltage | 2500 VRMS - meets reinforced insulation requirements per UL 1577, CSA 5A, and VDE 0884-2 for industrial and automotive safety boundaries. |
| Supply 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 components. |
| CMTI | 25 kV/µs - rejects high dv/dt noise in inverter legs and prevents false triggering in IGBT/SiC gate drive circuits. |
| Power @ 100 Mbps | 7.0–13.8 mA per side - reduces thermal load in compact, sealed enclosures used in EV battery management systems. |
Pinout & Package
SI8431AB-C-IS1 is housed in a 16-pin wide-body SOIC package (package width = 7.5 mm, creepage/clearance ≥ 8.0 mm), optimized for reinforced insulation in high-voltage industrial and automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Side 1 inputs/outputs/enable/power | Pins 1–4: CH1–CH3 inputs; Pin 5: EN1; Pins 6–7: VDD1/GND1; Pin 8: NC - defines primary-side signal domain with independent supply reference. |
| 9, 10, 11, 12, 13, 14, 15, 16 | Side 2 inputs/outputs/enable/power | Pins 9–11: CH1–CH3 outputs; Pin 12: EN2; Pins 13–14: VDD2/GND2; Pin 15: NC - defines isolated secondary-side domain with galvanic separation from Side 1. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-channel unidirectional isolation | Three independent, non-inverting data channels (CH1–CH3) with separate enable controls per side - supports isolated feedback + command + status in single-package motor drive interface. |
| Ultra-low power at high speed | 7.0 mA @ 100 Mbps on VDD1 and 11.0 mA on VDD2 at 5 V - enables energy-efficient operation in thermally constrained battery-powered inverters and portable test equipment. |
| Precision timing performance | 1.5 ns pulse width distortion and 2 ns propagation delay skew - preserves signal integrity in high-resolution PWM generation and time-of-flight sensing interfaces. |
| AEC-Q100 qualified | Grade 1 (–40 to +125 °C) qualification - validates suitability for under-hood automotive applications including traction inverter control and onboard chargers. |
| No start-up initialization | Valid output data within 40 µs of power application - eliminates boot-time delays in safety-critical systems requiring immediate fault monitoring after power-on. |
Applications
| Industrial Motor Control | Isolated ADC Interface |
|---|---|
|
Use Scenario: Isolating PWM gate signals and current-sense feedback between MCU and 3-phase IGBT/SiC inverter stage. IC Role / Device Role / Timing Role: Triple-channel isolator providing simultaneous, skew-controlled transmission of three PWM signals and/or analog feedback paths. Use Value: Enables precise dead-time control and real-time overcurrent protection with <0.5 ns inter-channel skew and 25 kV/µs CMTI immunity. |
Use Scenario: Isolating serial output of precision delta-sigma ADCs (e.g., ADS131M04) from host processor in high-voltage power metering. IC Role / Device Role / Timing Role: High-speed, low-jitter digital isolator preserving SPI clock/data timing integrity across isolation barrier. Use Value: Maintains 150 Mbps throughput and <2.5 ns pulse width distortion to prevent bit errors in 24-bit ADC data streams. |
| Hybrid Electric Vehicle Inverter | Isolated Switch-Mode Power Supply |
|
Use Scenario: Providing isolated gate drive enable/disable and fault reporting between vehicle controller and traction inverter module. IC Role / Device Role / Timing Role: Triple-channel isolator with independent EN1/EN2 pins enabling coordinated shutdown of all three phases during overtemperature events. Use Value: Achieves <9.2 ns enable-to-tri-state response and 2500 VRMS isolation to meet ISO 26262 ASIL-B functional safety requirements. |
Use Scenario: Isolating feedback signals (voltage/current sense) and PWM commands between primary-side controller and secondary-side synchronous rectifier in LLC resonant converter. IC Role / Device Role / Timing Role: Low-propagation-delay isolator ensuring tight regulation loop closure with <9.5 ns total delay across barrier. Use Value: Supports >1 MHz switching frequencies with minimal phase lag, improving transient response and efficiency in high-density AC/DC adapters. |
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, 30 ns max propagation delay, 2500 VRMS, SOIC-16 wide body | Lower data rate and higher timing uncertainty limit use in >1 MHz switching converters and high-resolution encoder interfaces | Preferred where cost sensitivity outweighs need for 150 Mbps or sub-10 ns timing; requires layout review for CMTI margin (15 kV/µs vs. 25 kV/µs) |
| ISO6731FDWR | 3-channel, 50 Mbps, 16 ns max propagation delay, 5000 VRMS, SOIC-16 wide body | Higher isolation rating but lower speed and wider skew (3 ns) restrict use in fast-loop digital power control | Selected when system-level isolation voltage exceeds 2500 VRMS requirement; not suitable for 150 Mbps SPI or PWM edge alignment |
Compared with ADUM1311BRWZ and ISO6731FDWR, SI8431AB-C-IS1 delivers superior high-speed timing fidelity and electromagnetic robustness-critical for automotive inverter control and high-frequency isolated ADC links-while maintaining identical SOIC-16 wide-body footprint and safety certifications.
Availability
SI8431AB-C-IS1 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 SI8431AB-C-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.
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 certified safety compliance.
FAQ
What is the maximum operating temperature for SI8431AB-C-IS1?
The SI8431AB-C-IS1 is rated for continuous operation from –40 °C to +125 °C at 150 Mbps, validated per AEC-Q100 Grade 1 requirements. Thermal derating applies above 105 °C ambient when operating at full data rate and supply voltage; full specifications are guaranteed across the entire range with appropriate PCB copper pour and airflow.
Does SI8431AB-C-IS1 support bidirectional communication?
No, SI8431AB-C-IS1 provides three unidirectional channels (CH1–CH3) with fixed input/output direction per side. Side 1 pins (1–4) are inputs only; Side 2 pins (9–11) are outputs only. For bidirectional isolation, discrete channel pairing or alternative devices like SI844x series are required.
What safety certifications apply to SI8431AB-C-IS1?
SI8431AB-C-IS1 carries UL 1577 (2500 VRMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE 0884-2 (IEC 60747-5-2) certifications. These cover reinforced insulation up to 560 Vpeak working voltage and are production-tested to 3000 VRMS for 1 second per regulatory protocol.
How does the enable function operate on SI8431AB-C-IS1?
SI8431AB-C-IS1 has two independent enable inputs: EN1 (Pin 5) controls Side 1 outputs, and EN2 (Pin 12) controls Side 2 outputs. When asserted low, each enable places its respective side's outputs in high-impedance state within 9.2 ns (ten2), allowing dynamic isolation barrier control without power cycling.
Is SI8431AB-C-IS1 pin-compatible with other Si843x variants?
Yes, SI8431AB-C-IS1 shares identical pinout and package (SOIC-16 wide body) with all Si8430/31/35 family members, including SI8431BB-C-IS1 and SI8435BB-C-IS1. Differences lie in channel count, directionality, and data rate grade-not physical layout-enabling drop-in replacement where functional requirements align.
SI8431AB-C-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:
- 1Mbps
- Propagation Delay tpLH / tpHL (Max):
- 35ns, 35ns
- Pulse Width Distortion (Max):
- 25ns
- 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
SI8431AB-C-IS1 FAQ
1.How can I place an order for SI8431AB-C-IS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8431AB-C-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 SI8431AB-C-IS1 reliable?
The price and inventory of SI8431AB-C-IS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8431AB-C-IS1 is usually 5 days.
3.What payment methods are accepted for SI8431AB-C-IS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8431AB-C-IS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8431AB-C-IS1?
SI8431AB-C-IS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8431AB-C-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 SI8431AB-C-IS1?
For technical support, including SI8431AB-C-IS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8431AB-C-IS1 requirements.
6.How does Aetrix verify that SI8431AB-C-IS1 is sourced from the original manufacturer or authorized distributors?
All SI8431AB-C-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 SI8431AB-C-IS1 meets industry standards.
7.What is the process for return or replacement of SI8431AB-C-IS1?
All SI8431AB-C-IS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8431AB-C-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 SI8431AB-C-IS1 part is unused and in its original packaging.
Return procedure for SI8431AB-C-IS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8431AB-C-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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
