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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8645ET-AS2R

Name: SI8645ET-AS2R
Brand: Skyworks Solutions Inc.
SKU: SI8645ET-AS2R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8645ET-AS2R

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8645ET-AS2R.pdf

Description:: LINEAR IC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8645ET-AS2R 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, enabling robust signal isolation in battery management systems and traction inverters.

For engineers reviewing the SI8645ET-AS2R datasheet, SI8645ET-AS2R pinout, SI8645ET-AS2R application, or SI8645ET-AS2R equivalent, key selection criteria include its wide-body SOIC-16 package with 8 mm creepage, AEC-Q100 qualification, VDE 0884-10 reinforced certification, and tri-state enable control for channel-level power management.

Technical Context

The SI8645ET-AS2R 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 optocouplers. Its architecture supports four unidirectional channels (4 input / 0 output side), all sharing a single enable control on the output side.

It features Schmitt-trigger inputs, precise timing (0.5 ns channel-channel skew, 2 ns propagation delay skew), and failsafe operation where outputs default to logic high during input-side power loss-enabled by ordering option "ET" and confirmed in Table 1.1 and Section 3.4.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	DC to 150 Mbps - supports high-speed serial interfaces including SPI, RS-485, and isolated ADC/DAC links without timing bottlenecks.
Isolation Rating	5 kV_RMS, reinforced per VDE 0884-10 - enables use in safety-critical automotive and industrial systems requiring double insulation.
Propagation Delay	5–13 ns (typ. 8 ns) - ensures deterministic timing in real-time motor control and power converter feedback loops.
Supply Voltage	2.5–5.5 V on both sides - allows interoperability with 3.3 V microcontrollers and 5 V analog subsystems without level-shifting.
Fail-Safe Default	High-output during VDD1 loss - prevents undefined states in BMS fault detection and OBC enable/disable sequencing.
CMTI	≥60 kV/µs - maintains signal integrity in high-dV/dt environments like IGBT gate drivers and inverter switching nodes.
Operating Temp	–40 to 125 °C - qualified for under-hood automotive applications and industrial ambient conditions without derating.

Pinout & Package

SI8645ET-AS2R uses a 16-pin wide-body SOIC package (–AS2 suffix denotes IS2 variant with tie-bar-free construction for 8 mm creepage). The package meets RoHS standards and JEDEC reflow Class 3A (260 °C peak).

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Input-side supply	Power for channel inputs A1–A4 and internal transmitter circuitry; bypass with 0.1 µF capacitor.
GND1	Input-side ground	Reference for input signals and VDD1; must be separated from GND2 by isolation barrier.
A1–A4	Input channels	Four digital inputs referenced to VDD1/GND1; Schmitt-triggered for >0.44 V hysteresis and noise rejection.
VDD2	Output-side supply	Power for output drivers B1–B4 and receiver; independent of VDD1 for galvanic isolation.
GND2	Output-side ground	Reference for outputs B1–B4; forms isolated domain with VDD2.
B1–B4	Output channels	Four isolated CMOS outputs; default high during VDD1 loss (ET ordering option); tri-state capable via EN.
EN	Enable control	Active-high enable on output side; drives B1–B4 into high-impedance when low (t_en2 ≤ 12 ns).
NC	No-connect	Pins 1, 9, 16 are unconnected; may be left floating, tied to VDD2, or grounded per layout best practice.

Key Features

Feature	Design Value
RF-based isolation barrier	Eliminates LED aging and temperature drift; enables stable 60-year lifetime at rated working voltage.
Tri-state output control	Single EN pin disables all four outputs simultaneously into high-Z, simplifying bus arbitration and power sequencing.
Selectably high-default fail-safe	Guarantees known logic state (high) on B1–B4 during input-side brownout-critical for safety interlocks in EV traction systems.
Ultra-low power at 100 Mbps	5.5 mA per channel at 5 V (typ.), reducing thermal load in densely packed automotive modules.
VDE 0884-10 reinforced certification	Validated for 10 kV surge capability and 5 kV_RMS working voltage-meets IEC 62368-1 and ISO 26262 ASIL-B requirements.

Applications

Battery Management System (BMS)	Traction Inverter Control
Use Scenario: Isolating cell voltage monitoring and pack communication between high-voltage battery stack and MCU. IC Role / Device Role / Timing Role: Quad-channel isolator transmitting analog front-end ADC data and status flags across 400–800 V domains. Use Value: 5 kV_RMS reinforced isolation and AEC-Q100 qualification ensure functional safety compliance in ASIL-C architectures.	Use Scenario: Transmitting PWM gate drive signals and fault feedback between inverter controller and IGBT/SiC half-bridge modules. IC Role / Device Role / Timing Role: High-speed, low-skew isolator preserving edge integrity for 20–100 kHz switching with <2 ns skew. Use Value: 60 kV/µs CMTI and <10 ns propagation delay prevent false triggering during fast dV/dt transients.
On-Board Charger (OBC)	Industrial Isolated Power Supply
Use Scenario: Isolating bidirectional AC/DC control signals (e.g., soft-start, phase sync, fault reporting) between primary and secondary sides. IC Role / Device Role / Timing Role: Fail-safe isolator with high-default outputs ensuring safe shutdown when primary-side power fails. Use Value: ET-specified high-fail-safe behavior eliminates need for external pull-ups and reduces BOM count.	Use Scenario: Providing isolated feedback for voltage regulation and overcurrent protection in 1–3 kW SMPS designs. IC Role / Device Role / Timing Role: Digital isolator replacing optocouplers in TL431-based feedback loops and digital PWM controllers. Use Value: 150 Mbps capability supports advanced digital control protocols (e.g., PMBus), while 2.5 V compatibility enables low-power auxiliary rails.

Battery Management System (BMS)

Traction Inverter Control

Use Scenario: Isolating cell voltage monitoring and pack communication between high-voltage battery stack and MCU.

IC Role / Device Role / Timing Role: Quad-channel isolator transmitting analog front-end ADC data and status flags across 400–800 V domains.

Use Value: 5 kV_RMS reinforced isolation and AEC-Q100 qualification ensure functional safety compliance in ASIL-C architectures.

Use Scenario: Transmitting PWM gate drive signals and fault feedback between inverter controller and IGBT/SiC half-bridge modules.

IC Role / Device Role / Timing Role: High-speed, low-skew isolator preserving edge integrity for 20–100 kHz switching with <2 ns skew.

Use Value: 60 kV/µs CMTI and <10 ns propagation delay prevent false triggering during fast dV/dt transients.

On-Board Charger (OBC)

Industrial Isolated Power Supply

Use Scenario: Isolating bidirectional AC/DC control signals (e.g., soft-start, phase sync, fault reporting) between primary and secondary sides.

IC Role / Device Role / Timing Role: Fail-safe isolator with high-default outputs ensuring safe shutdown when primary-side power fails.

Use Value: ET-specified high-fail-safe behavior eliminates need for external pull-ups and reduces BOM count.

Use Scenario: Providing isolated feedback for voltage regulation and overcurrent protection in 1–3 kW SMPS designs.

IC Role / Device Role / Timing Role: Digital isolator replacing optocouplers in TL431-based feedback loops and digital PWM controllers.

Use Value: 150 Mbps capability supports advanced digital control protocols (e.g., PMBus), while 2.5 V compatibility enables low-power auxiliary rails.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM4402BRWZ	4-channel, 5 kV_RMS, 100 Mbps, SOIC-16WB; no selectable fail-safe default; fixed low-fail-safe.	Lacks high-default output option; requires external pull-up for high-fail-safe behavior in BMS applications.	Choose when legacy design uses ADI's iCoupler architecture and high-fail-safe is not required.
ISO7741FDWR	4-channel, 5 kV_RMS, 100 Mbps, SOIC-16WB; TI's capacitive isolation; default low only; no high-fail-safe option.	Requires board-level redesign to implement high-fail-safe via external circuitry; lower CMTI (85 kV/µs typical but not guaranteed min).	Prefer when TI ecosystem integration (e.g., C2000 MCU + ISO774x) is prioritized over fail-safe flexibility.

Compared with ADUM4402BRWZ and ISO7741FDWR, SI8645ET-AS2R uniquely delivers factory-configured high-default fail-safe operation in a 150 Mbps, VDE-reinforced package-reducing design risk in automotive BMS and OBC where controlled power-loss response is mandatory.

Availability

SI8645ET-AS2R is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and industrial isolated power supplies requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.

Supply support for SI8645ET-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.

The Si864x family was designed specifically for high-reliability automotive and industrial isolation-delivering AEC-Q100 qualified, VDE-reinforced digital isolators with ultra-low power, precise timing, and fail-safe configurability.

FAQ

What is the isolation rating and certification status of SI8645ET-AS2R?

SI8645ET-AS2R provides 5 kV_RMS reinforced isolation certified to VDE 0884-10 (including 10 kV surge capability), UL 1577, CSA 5A, and CQC GB4943.1. It meets IEC 62368-1 and IEC 60601-1 requirements for reinforced insulation, making it suitable for automotive and medical applications where dual insulation is mandated.

Does SI8645ET-AS2R support fail-safe operation, and how is it configured?

Yes, SI8645ET-AS2R is ordered with "ET" suffix to specify high-default fail-safe behavior: when VDD1 is unpowered, outputs B1–B4 default to logic high. This is factory-configured-no external components or configuration registers are needed. The "E" denotes high-fail-safe, and "T" indicates VDE 0884-10 reinforced rating.

What package type does SI8645ET-AS2R use, and what does the "AS2" suffix mean?

SI8645ET-AS2R uses a 16-pin wide-body SOIC package. The "AS2" suffix identifies the IS2 variant: a tie-bar-free construction that achieves 8 mm creepage distance while maintaining standard WB SOIC-16 land pattern and dimensions-critical for high-voltage automotive PCB layouts.

Is SI8645ET-AS2R qualified for automotive applications, and what standards does it meet?

Yes, SI8645ET-AS2R is AEC-Q100 qualified (Grade 1, –40 to 125 °C) and supported with AIAG-compliant PPAP documentation, IMDS/CAMDS listings, and zero-defect manufacturing flow. It is explicitly listed in Skyworks' Automotive OPN table as "Si8645ET-AS2", confirming full automotive-grade build and traceability.

How does the enable (EN) pin function on SI8645ET-AS2R?

The EN pin on SI8645ET-AS2R is an active-high control on the output side (VDD2 domain) that places all four outputs (B1–B4) into high-impedance state when driven low. Propagation delay from EN low to tri-state is ≤12 ns (t_en2). EN is internally pulled up, so it may be left floating-but for noise immunity, Skyworks recommends tying it to VDD2 or GND in noisy environments.

SI8645ET-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:: 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-AS2R FAQ

1.How can I place an order for SI8645ET-AS2R through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8645ET-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 SI8645ET-AS2R reliable?

The price and inventory of SI8645ET-AS2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645ET-AS2R is usually 5 days.

3.What payment methods are accepted for SI8645ET-AS2R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645ET-AS2R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8645ET-AS2R?

SI8645ET-AS2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8645ET-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 SI8645ET-AS2R?

For technical support, including SI8645ET-AS2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645ET-AS2R requirements.

6.How does Aetrix verify that SI8645ET-AS2R is sourced from the original manufacturer or authorized distributors?

All SI8645ET-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 SI8645ET-AS2R meets industry standards.

7.What is the process for return or replacement of SI8645ET-AS2R?

All SI8645ET-AS2R units undergo pre-shipment inspection (PSI). If there is an issue with SI8645ET-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 SI8645ET-AS2R part is unused and in its original packaging.

Return procedure for SI8645ET-AS2R:

1.Submit a request within 90 days.

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

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