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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8642BT-AS2R

Name: SI8642BT-AS2R
Brand: Skyworks Solutions Inc.
SKU: SI8642BT-AS2R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8642BT-AS2R

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

Package:: 16-SOIC (0.295", 7.50mm Width)

Datasheet:: SI8642BT-AS2R.pdf

Description:: LINEAR IC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8642BT-AS2R from Skyworks is a quad-channel, 2-input/2-output digital isolator with reinforced 5 kV_RMS isolation, 150 Mbps data rate, <10 ns propagation delay, and AEC-Q100 automotive qualification. It implements RF-based isolation across two independent voltage domains (VDD1/VDD2), supports fail-safe low-default output, and operates from –40°C to +125°C in wide-body SOIC-16 package for high-reliability motor control and battery management systems.

For engineers reviewing the SI8642BT-AS2R datasheet, SI8642BT-AS2R pinout, SI8642BT-AS2R application, or SI8642BT-AS2R equivalent, key selection criteria include its 5 kV_RMS reinforced VDE 0884-10 rating, tri-state enable control per side, 2.5–5.5 V dual-supply flexibility, and automotive-grade transient immunity up to 100 kV/µs - all validated under AEC-Q100 Grade 0 conditions.

Technical Context

The SI8642BT-AS2R uses RF on/off keying modulation across a silicon dioxide isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture delivers deterministic timing with 0.5 ns channel-channel skew and 2 ns propagation delay skew across temperature and supply variations.

It features two independent enable inputs (EN1 on Side A, EN2 on Side B), each controlling two outputs in tri-state mode. The device supports selectable fail-safe default output (low for this variant) during input-side power loss, with <12 ns transition time to valid state upon VDD restoration - critical for safety-critical automotive subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
Isolation Rating	5 kV_RMS reinforced insulation per VDE 0884-10; enables use in high-voltage traction inverters and OBCs requiring reinforced barrier integrity.
Max Data Rate	150 Mbps - supports real-time CAN FD, SPI, and isolated ADC/DAC interfaces in EV battery monitoring and motor control loops.
Propagation Delay	8 ns typical - ensures sub-10 ns timing alignment between isolated control signals in gate driver feedback paths.
Supply Voltage Range	2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level shifters.
Common-Mode Transient Immunity	100 kV/µs - maintains signal integrity during fast-switching events in 800 V SiC inverter stages.
Operating Temperature	–40°C to +125°C ambient - qualified per AEC-Q100 Grade 0 for under-hood and battery-pack mounting locations.
Fail-Safe Default	Low output when VDD1 unpowered - prevents unintended activation of downstream drivers during brown-out conditions.

Pinout & Package

SI8642BT-AS2R is housed in a RoHS-compliant wide-body SOIC-16 package (8 mm creepage, -AS2 suffix), supporting reinforced insulation and 5 kV_RMS withstand voltage. Land pattern follows JEDEC MS-013AC standard with 1.27 mm pitch.

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Input-side power supply	Supplies logic and transmitter circuitry for channels A1–A2; requires local 0.1 µF bypass capacitor.
GND1	Input-side ground reference	Return path for VDD1; must be separated from GND2 by ≥8 mm creepage for reinforced isolation compliance.
A1, A2	Input signals (Side A)	Schmitt-triggered inputs with 0.44 V hysteresis; tolerate slow edges and EMI in noisy motor drive environments.
EN1	Enable control for Side A outputs	Active-high; drives A3/A4 into high-impedance when low - enables dynamic channel gating in multi-phase controllers.
VDD2	Output-side power supply	Supplies receiver and output driver circuitry for channels B1–B2; independent of VDD1 for true galvanic separation.
GND2	Output-side ground reference	Return path for VDD2; forms isolated domain boundary with GND1; critical for safety certification traceability.
B1, B2	Isolated output signals (Side B)	50 Ω nominal output impedance; compatible with controlled-impedance PCB routing for clean 150 Mbps eye diagrams.
EN2	Enable control for Side B outputs	Active-high; controls B1/B2 tri-state behavior - supports synchronized shutdown of dual isolated gate drivers.

Key Features

Feature	Design Value
RF-based isolation barrier	Silicon dioxide dielectric with 60-year lifetime at rated working voltage; no LED aging or CMTI drift over time.
Tri-state enable per side	Independent EN1/EN2 pins allow selective disabling of A3/A4 or B1/B2 outputs without affecting other channels - reduces system-level EMI during idle phases.
Fail-safe low default	Guaranteed low output on B1/B2 when VDD1 = 0 V and VDD2 powered - eliminates risk of floating control lines in battery disconnect scenarios.
Ultra-low power at 100 Mbps	11 mA per side at 5 V/100 Mbps - cuts thermal load in densely packed automotive ECUs versus optocoupler alternatives.
Automotive qualification	AEC-Q100 Grade 0 (–40°C to +150°C junction), AIAG PPAP support, IMDS/CAMDS compliance - meets OEM Tier-1 sourcing requirements.

Applications

Motor Control	Battery Management System
Use Scenario: Isolating PWM signals and fault feedback between MCU and IGBT/SiC gate drivers in 400–800 V traction inverters. IC Role / Device Role / Timing Role: Quad-channel isolator providing bidirectional signal integrity for phase-A/B gate drive enable and DESAT feedback with <10 ns timing alignment. Use Value: Enables safe operation at 150 Mbps while maintaining 100 kV/µs CMTI - preventing false triggering during fast dV/dt switching transients.	Use Scenario: Isolating cell voltage measurement data and balancing commands between battery monitor IC and MCU in EV pack modules. IC Role / Device Role / Timing Role: Dual 2-channel isolation path: one for isolated SPI communication (A1/A2 → B1/B2), one for isolated GPIO fault alerts. Use Value: Fail-safe low default prevents erroneous cell balancing activation during partial power loss - critical for functional safety (ISO 26262 ASIL-C).
On-Board Charger	Traction Inverter Control
Use Scenario: Signal isolation between AC/DC controller and DC/DC stage in bi-directional OBCs handling 11–22 kW charging. IC Role / Device Role / Timing Role: Provides isolated gate drive enable and current-sense amplifier output isolation across primary/secondary boundaries. Use Value: 5 kV_RMS reinforced rating satisfies IEC 62368-1 and UL 60950-1 requirements for double-insulated power conversion stages.	Use Scenario: Isolating torque command signals and resolver feedback in high-performance electric axle control units. IC Role / Device Role / Timing Role: Delivers deterministic latency (<13 ns max) for closed-loop torque control loops requiring sub-microsecond response. Use Value: 0.5 ns channel-channel skew ensures synchronous sampling of three-phase current sensors - improving FOC accuracy and reducing torque ripple.

Motor Control

Battery Management System

Use Scenario: Isolating PWM signals and fault feedback between MCU and IGBT/SiC gate drivers in 400–800 V traction inverters.

IC Role / Device Role / Timing Role: Quad-channel isolator providing bidirectional signal integrity for phase-A/B gate drive enable and DESAT feedback with <10 ns timing alignment.

Use Value: Enables safe operation at 150 Mbps while maintaining 100 kV/µs CMTI - preventing false triggering during fast dV/dt switching transients.

Use Scenario: Isolating cell voltage measurement data and balancing commands between battery monitor IC and MCU in EV pack modules.

IC Role / Device Role / Timing Role: Dual 2-channel isolation path: one for isolated SPI communication (A1/A2 → B1/B2), one for isolated GPIO fault alerts.

Use Value: Fail-safe low default prevents erroneous cell balancing activation during partial power loss - critical for functional safety (ISO 26262 ASIL-C).

On-Board Charger

Traction Inverter Control

Use Scenario: Signal isolation between AC/DC controller and DC/DC stage in bi-directional OBCs handling 11–22 kW charging.

IC Role / Device Role / Timing Role: Provides isolated gate drive enable and current-sense amplifier output isolation across primary/secondary boundaries.

Use Value: 5 kV_RMS reinforced rating satisfies IEC 62368-1 and UL 60950-1 requirements for double-insulated power conversion stages.

Use Scenario: Isolating torque command signals and resolver feedback in high-performance electric axle control units.

IC Role / Device Role / Timing Role: Delivers deterministic latency (<13 ns max) for closed-loop torque control loops requiring sub-microsecond response.

Use Value: 0.5 ns channel-channel skew ensures synchronous sampling of three-phase current sensors - improving FOC accuracy and reducing torque ripple.

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital isolator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM2402BRWZ	4-channel, 2/2 configuration; 25 kV/µs CMTI; 5 kV_RMS basic isolation; SOIC-16 narrow body; no AEC-Q100 grade.	Limited to industrial automation; lacks reinforced insulation and automotive qualification required for EV traction systems.	Choose for cost-sensitive industrial PLCs where 25 kV/µs CMTI suffices and automotive compliance is not mandated.
ISO7742FDWR	4-channel, 2/2 configuration; 100 Mbps max; 8000 V_PK surge rating; SOIC-16 wide body; AEC-Q100 Grade 1 (–40°C to +125°C).	Lower data rate limits use in high-speed SPI or CAN FD interfaces; surge rating differs from VDE 0884-10 reinforced certification.	Choose when VDE 0884-10 reinforcement is not required but TI's process consistency and long-term supply assurance are prioritized.

Compared with ADUM2402BRWZ and ISO7742FDWR, SI8642BT-AS2R uniquely combines AEC-Q100 Grade 0, VDE 0884-10 reinforced 5 kV_RMS, and 150 Mbps performance - making it the only option qualified for safety-critical, high-speed isolation in next-generation EV powertrain control units.

Availability

SI8642BT-AS2R is available at Aetrix Electronics and suitable for automotive battery management systems, traction inverter control units, on-board chargers, and motor control modules requiring stable component supply across extended product lifecycles.

Supply support for SI8642BT-AS2R 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 Si864x family was designed specifically for high-reliability automotive and industrial isolation applications demanding reinforced safety certification, ultra-low power, and precise timing - targeting EV powertrain, battery systems, and industrial automation.

FAQ

What is the isolation rating and certification status of SI8642BT-AS2R?

SI8642BT-AS2R provides 5 kV_RMS reinforced isolation certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1. It meets IEC 62368-1 and IEC 60601-1 requirements for reinforced insulation. The "T" in the part number explicitly denotes VDE 0884-10 reinforced rating, and the "-AS2" suffix confirms wide-body SOIC packaging with 8 mm creepage for full compliance.

Does SI8642BT-AS2R support fail-safe operation, and what is its default state?

Yes, SI8642BT-AS2R supports selectable fail-safe operation via ordering option. This specific variant (suffix "BT") is configured for default low output on B1/B2 when VDD1 is unpowered but VDD2 remains active. The transition to valid default state occurs within 12 ns, ensuring predictable behavior during brown-out conditions in automotive battery systems.

What are the supply voltage requirements for SI8642BT-AS2R?

SI8642BT-AS2R operates with independent 2.5–5.5 V supplies on both sides (VDD1 and VDD2). Each side requires a local 0.1 µF bypass capacitor. The device maintains full 150 Mbps data rate and <10 ns propagation delay across this entire range, enabling interoperability with 3.3 V MCUs and 5 V analog circuits without external level translation.

How does SI8642BT-AS2R handle electromagnetic interference in high-noise environments?

SI8642BT-AS2R achieves 100 kV/µs common-mode transient immunity (CMTI) due to its RF modulation architecture and Schmitt-trigger inputs with 0.44 V hysteresis. This exceeds typical automotive requirements and ensures reliable operation near high-dV/dt SiC switches. Layout best practices - including separate ground planes and minimized loop area - further enhance noise resilience.

Is SI8642BT-AS2R pin-compatible with other Si864x variants?

SI8642BT-AS2R shares identical pinout and package (wide-body SOIC-16) with all Si8642x variants in the -AS/-AS1/-AS2 suffix family, including SI8642BB-AS2R and SI8642BD-AS2R. Differences lie in isolation rating (2.5 kV vs. 5 kV), fail-safe default (low vs. high), and VDE certification level (basic vs. reinforced) - not pin assignment or footprint.

SI8642BT-AS2R Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: Si864x

Package/Case:: 16-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Magnetic Coupling

Type:: General Purpose

Isolated Power:: Yes

Number of Channels:: 4

Inputs - Side 1/Side 2:: 2/2

Channel Type:: Unidirectional

Voltage - Isolation:: 5000Vrms

Common Mode Transient Immunity (Min):: 35kV/µs

Data Rate:: 150Mbps

Propagation Delay tpLH / tpHL (Max):: 13ns, 13ns

Pulse Width Distortion (Max):: 4.5ns

Rise / Fall Time (Typ):: 2.5ns, 2.5ns

Voltage - Supply:: 2.375V ~ 5.5V

Grade:: Automotive

Qualification:: AEC-Q100

Operating Temperature:: -40°C ~ 125°C

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

SI8642BT-AS2R FAQ

1.How can I place an order for SI8642BT-AS2R through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8642BT-AS2R 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 SI8642BT-AS2R reliable?

The price and inventory of SI8642BT-AS2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8642BT-AS2R is usually 5 days.

3.What payment methods are accepted for SI8642BT-AS2R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8642BT-AS2R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8642BT-AS2R?

SI8642BT-AS2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8642BT-AS2R 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 SI8642BT-AS2R?

For technical support, including SI8642BT-AS2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8642BT-AS2R requirements.

6.How does Aetrix verify that SI8642BT-AS2R is sourced from the original manufacturer or authorized distributors?

All SI8642BT-AS2R 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 SI8642BT-AS2R meets industry standards.

7.What is the process for return or replacement of SI8642BT-AS2R?

All SI8642BT-AS2R units undergo pre-shipment inspection (PSI). If there is an issue with SI8642BT-AS2R, 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 SI8642BT-AS2R part is unused and in its original packaging.

Return procedure for SI8642BT-AS2R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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