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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8645ET-AS2

Name: SI8645ET-AS2
Brand: Skyworks Solutions Inc.
SKU: SI8645ET-AS2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8645ET-AS2

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8645ET-AS2.pdf

Description:: LINEAR IC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8645ET-AS2 from Skyworks is a quad-channel, high-speed digital isolator with reinforced 5 kV_RMS isolation, 150 Mbps data rate, <10 ns propagation delay, and selectable high-default fail-safe output mode. It operates across –40 to 125 °C and supports 2.5–5.5 V dual supplies, serving as a robust replacement for optocouplers in isolated gate drivers and battery management systems.

For engineers reviewing the SI8645ET-AS2 datasheet, SI8645ET-AS2 pinout, SI8645ET-AS2 application, or SI8645ET-AS2 equivalent, key selection criteria include its 5 kV_RMS reinforced VDE 0884-10 certification, automotive-grade AEC-Q100 qualification, ultra-low power consumption at 100 Mbps (3.5 mA/channel @ 2.5 V), and WB SOIC-16 package with 8 mm creepage.

Technical Context

The SI8645ET-AS2 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering superior CMTI (≥60 kV/µs) and noise immunity versus pulse-based schemes. Its four unidirectional channels (4 input / 0 output side inputs) are fully independent, each featuring Schmitt-trigger inputs and tri-state outputs controlled by dedicated enable logic.

All channels share a single high-default fail-safe mode (ordered via "ET" suffix), ensuring outputs drive high during input-side power loss while maintaining precise timing: 0.5 ns channel-channel skew, 2 ns propagation delay skew, and 5 ns minimum pulse width-enabling reliable operation in fast-switching motor control and isolated ADC interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
Isolation Rating	5 kV_RMS reinforced insulation per VDE 0884-10 - enables use in mains-connected industrial inverters and EV traction systems without additional barrier reinforcement.
Max Data Rate	150 Mbps - supports real-time feedback loops in servo drives and high-resolution isolated current sensing.
Propagation Delay	5–13 ns (typ. 8 ns) - ensures sub-10 ns timing alignment critical for synchronous PWM gate driving.
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.
Fail-Safe Default	High-output state during VDD1 loss - prevents unintended low-side FET turn-on in isolated half-bridge drivers.
CMTI	≥60 kV/µs - maintains signal integrity in high-dV/dt environments like SiC/GaN inverter switching nodes.
Operating Temp	–40 to 125 °C - qualified for under-hood automotive applications including on-board chargers and battery management units.

Pinout & Package

SI8645ET-AS2 uses a 16-pin wide-body SOIC package (WB SOIC-16, -AS2 variant) with 8 mm creepage distance and reinforced insulation. Pin 1 is marked with a dot; pins 1–8 reside on Side A (input side), pins 9–16 on Side B (output side).

Pin/Terminal	Circuit Role	Design Meaning
VDD1, GND1	Input-side power supply	Power domain for all four input buffers and internal RF transmitter; bypass capacitor required.
VDD2, GND2	Output-side power supply	Independent power domain for RF receiver and output drivers; enables galvanic separation of logic domains.
A1–A4	Digital inputs	Schmitt-triggered inputs accepting 2.5–5.5 V logic; no external pull-ups needed for default-high operation.
B1–B4	Isolated digital outputs	CMOS outputs with ~50 Ω impedance; tri-state capable via EN logic (EN1/EN2 not present on SI8645x).
NC	No-connect	Pins 10 and 15 are internally unconnected; may be left floating, tied to VDD2, or grounded per layout best practice.

Key Features

Feature	Design Value
Reinforced VDE 0884-10 certification	Validated 10 kV surge capability and 5 kV_RMS working voltage - eliminates need for external transient protection in IEC 61000-4-5 Level 4 systems.
AEC-Q100 Grade 1 qualification	Full automotive process flow with zero-defect methodology - supports PPAP documentation and IMDS/CAMDS compliance for Tier 1 automotive programs.
Ultra-low power at 100 Mbps	3.5 mA per channel @ 2.5 V - reduces thermal load in densely packed BMS modules and extends battery runtime in portable test equipment.
RF modulation architecture	No start-up initialization or clock distribution required - simplifies firmware design and avoids metastability during brown-out recovery.
Selectable fail-safe output	Factory-configured high-default state - guarantees safe shutdown of downstream power stages when primary controller loses power.

Applications

Motor Control Systems	Isolated Power Conversion
Use Scenario: Isolating PWM signals between MCU and gate drivers in 3-phase inverter stacks for HVAC compressors and industrial servo drives. IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting complementary high-side/low-side gate signals with <2 ns inter-channel skew. Use Value: Enables precise dead-time control and prevents shoot-through faults due to matched propagation delays and 0.5 ns channel-channel skew.	Use Scenario: Providing feedback isolation for voltage and current sensing in 3.3 kW LLC resonant converters used in server PSUs and telecom rectifiers. IC Role / Device Role / Timing Role: Transmitting isolated analog-to-digital converter (ADC) output bits across safety barrier with 150 Mbps throughput. Use Value: Supports 16-bit resolution sampling at >1 MSPS without timing jitter degradation, thanks to 350 ps peak eye diagram jitter.
Battery Management Systems	Automotive On-Board Chargers
Use Scenario: Isolating cell monitoring IC communications and pack-level fault signals in 800 V EV battery packs. IC Role / Device Role / Timing Role: Reliable transmission of overvoltage/overtemperature alerts from isolated slave controllers to master MCU across 5 kV_RMS barrier. Use Value: Maintains functional safety integrity under continuous 125 °C ambient and 50 kV/µs common-mode transients during fast charging.	Use Scenario: Isolating CAN FD communication and AC/DC control signals in bi-directional OBCs compliant with ISO 15118 and SAE J1772. IC Role / Device Role / Timing Role: Galvanically separating 12 V vehicle network from 400/800 V DC-link while supporting 2 Mbps CAN FD data rates. Use Value: Meets reinforced insulation requirements for EVSE systems per IEC 62109 and UL 62368-1, with AEC-Q100 qualification for lifetime reliability.

Motor Control Systems

Isolated Power Conversion

Use Scenario: Isolating PWM signals between MCU and gate drivers in 3-phase inverter stacks for HVAC compressors and industrial servo drives.

IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting complementary high-side/low-side gate signals with <2 ns inter-channel skew.

Use Value: Enables precise dead-time control and prevents shoot-through faults due to matched propagation delays and 0.5 ns channel-channel skew.

Use Scenario: Providing feedback isolation for voltage and current sensing in 3.3 kW LLC resonant converters used in server PSUs and telecom rectifiers.

IC Role / Device Role / Timing Role: Transmitting isolated analog-to-digital converter (ADC) output bits across safety barrier with 150 Mbps throughput.

Use Value: Supports 16-bit resolution sampling at >1 MSPS without timing jitter degradation, thanks to 350 ps peak eye diagram jitter.

Battery Management Systems

Automotive On-Board Chargers

Use Scenario: Isolating cell monitoring IC communications and pack-level fault signals in 800 V EV battery packs.

IC Role / Device Role / Timing Role: Reliable transmission of overvoltage/overtemperature alerts from isolated slave controllers to master MCU across 5 kV_RMS barrier.

Use Value: Maintains functional safety integrity under continuous 125 °C ambient and 50 kV/µs common-mode transients during fast charging.

Use Scenario: Isolating CAN FD communication and AC/DC control signals in bi-directional OBCs compliant with ISO 15118 and SAE J1772.

IC Role / Device Role / Timing Role: Galvanically separating 12 V vehicle network from 400/800 V DC-link while supporting 2 Mbps CAN FD data rates.

Use Value: Meets reinforced insulation requirements for EVSE systems per IEC 62109 and UL 62368-1, with AEC-Q100 qualification for lifetime reliability.

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, 25 Mbps max rate; 5 kV_RMS basic isolation; no AEC-Q100 qualification; 25 ns propagation delay.	Suitable for industrial PLC I/O modules but lacks automotive qualification and high-speed timing for OBC control loops.	Choose when cost sensitivity outweighs speed and automotive compliance requirements.
ISO7741FDWR	4-channel, 100 Mbps max rate; 5 kV_RMS reinforced isolation; AEC-Q100 qualified; 11 ns propagation delay.	Valid for automotive BMS but limited to 100 Mbps-insufficient for high-fidelity isolated ADC streaming in next-gen inverters.	Prefer when system-level CMTI >50 kV/µs is acceptable and 150 Mbps bandwidth is not required.

Compared with ADUM2402BRWZ and ISO7741FDWR, SI8645ET-AS2 delivers 1.5× higher data rate than ISO7741FDWR and 6× higher than ADUM2402BRWZ, combined with best-in-class 60 kV/µs CMTI and factory-set high-fail-safe behavior-making it optimal for safety-critical, high-speed automotive and industrial isolation where timing precision and transient immunity are non-negotiable.

Availability

SI8645ET-AS2 is available at Aetrix Electronics and suitable for battery management systems, automotive on-board chargers, and industrial motor control applications requiring stable component supply, long-term lifecycle support, and traceable automotive-grade sourcing.

Supply support for SI8645ET-AS2 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 leader in analog and mixed-signal semiconductors, specializing in RF, wireless infrastructure, and high-reliability isolation technologies.

The Si864x family was engineered specifically for demanding automotive and industrial isolation needs-delivering reinforced safety certification, AEC-Q100 qualification, and RF-based timing precision unmatched by legacy optocoupler or capacitive isolator solutions.

FAQ

What is the isolation rating and safety certification status of SI8645ET-AS2?

SI8645ET-AS2 provides 5 kV_RMS reinforced isolation certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1 standards. It meets IEC 62368-1 and IEC 60601-1 requirements for reinforced insulation, with 10 kV surge capability-validated for use in medical and EV power systems where double insulation is mandated.

Does SI8645ET-AS2 require external pull-up or pull-down resistors on its inputs or outputs?

No. SI8645ET-AS2 features factory-configured internal 10 µA pull-ups on all inputs and outputs due to its "ET" ordering code (high-default fail-safe). This eliminates external biasing components, reduces BOM count, and ensures deterministic high-state behavior during input-side power loss-critical for gate driver safety logic.

How does the enable functionality work on SI8645ET-AS2?

SI8645ET-AS2 has no enable pins (EN1/EN2). As a Si8645x variant, all four output channels are always enabled-unlike Si8641x/Si8642x families. Outputs follow inputs continuously when both VDD1 and VDD2 are powered; during VDD1 loss, outputs hold high per the fail-safe configuration-no external enable control is implemented or required for SI8645ET-AS2.

What is the maximum operating temperature and thermal derating guidance for SI8645ET-AS2?

SI8645ET-AS2 is rated for –40 to 125 °C ambient operation with junction temperatures up to 150 °C. Thermal derating is not required within this range; however, at 125 °C ambient and 100 Mbps operation, total supply current rises to ~22.8 mA per side-designers should verify PCB copper area and airflow meet thermal resistance targets per Skyworks' AN1117 layout guidelines.

Can SI8645ET-AS2 interface directly with 1.8 V logic systems?

No. SI8645ET-AS2 requires minimum 2.375 V on VDD1 and VDD2 per datasheet Table 4.1. Its input thresholds (VT+ = 1.4–1.9 V, VT– = 1.0–1.4 V) are incompatible with 1.8 V logic swing. For 1.8 V systems, level-shifting circuitry or a compatible isolator such as Si86xxD variants with lower VDD minima must be used-SI8645ET-AS2 is optimized for 2.5–5.5 V domains only.

SI8645ET-AS2 Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: Si864x

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

Packaging:: Tube

Product Status:: Active

Technology:: Magnetic Coupling

Type:: General Purpose

Isolated Power:: Yes

Number of Channels:: 4

Inputs - Side 1/Side 2:: 4/0

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

SI8645ET-AS2 FAQ

1.How can I place an order for SI8645ET-AS2 through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8645ET-AS2 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 SI8645ET-AS2 reliable?

The price and inventory of SI8645ET-AS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645ET-AS2 is usually 5 days.

3.What payment methods are accepted for SI8645ET-AS2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645ET-AS2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8645ET-AS2?

SI8645ET-AS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8645ET-AS2 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 SI8645ET-AS2?

For technical support, including SI8645ET-AS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645ET-AS2 requirements.

6.How does Aetrix verify that SI8645ET-AS2 is sourced from the original manufacturer or authorized distributors?

All SI8645ET-AS2 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 SI8645ET-AS2 meets industry standards.

7.What is the process for return or replacement of SI8645ET-AS2?

All SI8645ET-AS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8645ET-AS2, 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 SI8645ET-AS2 part is unused and in its original packaging.

Return procedure for SI8645ET-AS2:

1.Submit a request within 90 days.

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

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