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Skyworks Solutions Inc. SI8645ET-ASR
- Part No.:
- SI8645ET-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8645ET-ASR.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:2,439
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Product details
Overview
SI8645ET-ASR from Skyworks is a quad-channel, high-speed digital isolator with reinforced 5 kVRMS isolation, 150 Mbps data rate, <10 ns propagation delay, and selectable high-default fail-safe output mode. It operates across 2.5–5.5 V supplies and supports industrial and automotive systems requiring robust galvanic separation between control and power domains.
For engineers reviewing the SI8645ET-ASR datasheet, SI8645ET-ASR pinout, SI8645ET-ASR application, or SI8645ET-ASR equivalent, this device delivers verified sub-10 ns timing, 50 kV/µs CMTI, AEC-Q100 qualification, and SOIC-16 wide-body packaging for reinforced insulation in high-noise motor drives, battery management, and isolated ADC interfaces.
Technical Context
The SI8645ET-ASR implements RF-based on/off keying across a silicon-die isolation barrier-eliminating startup initialization and enabling deterministic DC-to-150 Mbps operation. Its four unidirectional channels (all inputs on VDD1 side, all outputs on VDD2 side) are controlled by no enable pins, simplifying interface logic.
It features Schmitt-trigger inputs for noise immunity, 50 Ω nominal output impedance, and failsafe behavior where outputs default to logic high during input-side power loss. Reinforced VDE 0884-10 certification and 10 kV surge capability confirm suitability for safety-critical 5 kVRMS working voltage applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 unidirectional, input-side only (VDD1), output-side only (VDD2) |
| Max Data Rate | 150 Mbps - supports high-speed SPI, RS-485, and digital encoder interfaces without oversampling |
| Propagation Delay | 5–13 ns - enables tight timing closure in real-time control loops with <2 ns skew between channels |
| Isolation Rating | 5 kVRMS, reinforced - certified to VDE 0884-10 and UL 1577 for primary-secondary separation in >1000 V systems |
| Supply Voltage | 2.5–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends |
| CMTI | 60 kV/µs (typ) - prevents false triggering in fast-switching inverters with dV/dt >10 kV/µs |
| Fail-Safe Default | High - ensures active-high enable signals remain asserted during brownout or controller reset |
Pinout & Package
SI8645ET-ASR uses a RoHS-compliant 16-pin wide-body SOIC package (WB SOIC-16, -IS suffix), providing 8 mm creepage and reinforced insulation for 5 kVRMS applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for channel inputs and internal transmitter; must be bypassed with 0.1 µF capacitor |
| GND1 | Input-side ground | Reference return for inputs and VDD1; requires low-inductance connection to minimize noise coupling |
| IN1–IN4 | Input signals | CMOS/Schmitt-trigger inputs accepting 2.5–5.5 V logic; no external pull-ups needed for default-high operation |
| VDD2 | Output-side supply | Power for output drivers and receiver; independent of VDD1 for true galvanic isolation |
| GND2 | Output-side ground | Isolated reference for outputs; must be separated from GND1 by ≥8 mm creepage |
| OUT1–OUT4 | Isolated outputs | 50 Ω nominal drive strength; compatible with 50 Ω PCB traces and standard logic loads |
| NC | No-connect | Pins 1, 2, 15, 16 are unused; must remain floating or tied to GND/VDD2 per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift; enables stable 150 Mbps performance over –40°C to +125°C |
| Selectable high-default fail-safe mode | Guarantees OUTx = high when VDD1 is unpowered - critical for keeping gate drivers or enable lines active during fault |
| Tri-state not supported | No EN pins - simplifies PCB routing and eliminates enable timing constraints in fixed-direction signal paths |
| 60 kV/µs CMTI (typ) | Withstands rapid common-mode transients in IGBT/SiC inverter switching without data corruption |
| AEC-Q100 Grade 1 qualified | Validated for automotive use up to +125°C ambient - suitable for on-board chargers and traction inverter control |
Applications
| Motor Control Systems | Isolated ADC Interfaces |
|---|---|
Use Scenario: Isolating PWM gate-drive signals from MCU in 3-phase inverter stacks driving PMSM or induction motors. IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting high-speed control signals across isolation barrier with <10 ns delay and <2 ns skew. Use Value: Enables precise phase alignment of gate drivers, reducing torque ripple and EMI while maintaining functional safety compliance. | Use Scenario: Separating precision sigma-delta ADC digital outputs (e.g., ADS131M04) from host processor in high-voltage battery monitoring. IC Role / Device Role / Timing Role: Transmitting 24-bit serial data streams at up to 150 Mbps with deterministic latency and no clock domain synchronization overhead. Use Value: Preserves ADC resolution and sampling integrity by eliminating ground-loop noise and common-mode interference in 800 V battery packs. |
| Battery Management Systems | Industrial PLC I/O Modules |
Use Scenario: Isolating cell voltage measurement and balancing command signals between BMS master controller and slave monitor ICs in EV battery packs. IC Role / Device Role / Timing Role: Providing reinforced 5 kVRMS isolation for communication links operating at 1–10 Mbps with fail-safe high default during MCU reset. Use Value: Ensures safe default state for balancing FETs during power-up or brownout, preventing unintended discharge or thermal runaway. | Use Scenario: Digitally isolating discrete input/output signals (e.g., 24 V DC sensors, relay drivers) in modular PLC backplanes. IC Role / Device Role / Timing Role: Replacing optocouplers with 4-channel digital isolator supporting 2.5–5.5 V logic on both sides and 60 kV/µs transient immunity. Use Value: Reduces board space by 40% vs. discrete optos, improves long-term reliability, and eliminates LED degradation concerns in 24/7 factory automation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM4402ARWZ | 4-channel, 5 kVRMS, 100 Mbps max, 13 ns propagation delay, default-low fail-safe | Lacks AEC-Q100 qualification; lower CMTI (25 kV/µs); narrow-body SOIC-16 | Prefer SI8645ET-ASR for automotive BMS or high-CMTI motor control; ADUM4402ARWZ suits cost-sensitive industrial I/O where 100 Mbps suffices. |
| ISO6741QDWR | 4-channel, 5 kVRMS, 50 Mbps max, 16 ns propagation delay, no selectable fail-safe (fixed low) | Qualified to AEC-Q100 Grade 0 (–40°C to +150°C), but lower speed and no high-default option | Choose SI8645ET-ASR when 150 Mbps and programmable high-default are required; ISO6741QDWR fits thermally demanding but lower-bandwidth automotive sensor interfaces. |
Compared with ADUM4402ARWZ and ISO6741QDWR, SI8645ET-ASR uniquely combines 150 Mbps speed, high-default fail-safe, 60 kV/µs CMTI, and AEC-Q100 Grade 1 qualification in a single reinforced 5 kVRMS SOIC-16 package-making it optimal for next-generation EV powertrain and high-fidelity isolated data acquisition.
Availability
SI8645ET-ASR is available at Aetrix Electronics and suitable for motor control systems, battery management systems, isolated ADC interfaces, and industrial PLC I/O modules requiring stable component supply across automotive and industrial lifecycles.
Supply support for SI8645ET-ASR 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 galvanic isolation in safety-critical power conversion, motor control, and automotive electrification applications-emphasizing low power, precise timing, and reinforced certification.
FAQ
What is the isolation rating and safety certification of SI8645ET-ASR?
SI8645ET-ASR provides 5 kVRMS reinforced isolation and is certified to UL 1577, VDE 0884-10 (reinforced), CSA 5A, IEC 62368-1, and GB4943.1. It meets reinforced insulation requirements for systems operating up to 1000 VRMS working voltage, with 10 kV surge capability confirmed per VDE 0884-10.
Does SI8645ET-ASR support bidirectional communication?
No, SI8645ET-ASR is a unidirectional quad-channel isolator with all four inputs on the VDD1 side and all four outputs on the VDD2 side. It does not support bidirectional data flow or shared bus topologies. For bidirectional applications, consider SI8642xx variants instead.
What is the default output state of SI8645ET-ASR during input-side power loss?
SI8645ET-ASR has a high-default fail-safe mode: when VDD1 is unpowered but VDD2 remains active, all four outputs (OUT1–OUT4) drive logic high. This behavior is fixed by the "ET" ordering code and requires no external configuration.
Is SI8645ET-ASR qualified for automotive applications?
Yes, SI8645ET-ASR is AEC-Q100 Grade 1 qualified (–40°C to +125°C) and manufactured using automotive-specific process flows. It supports PPAP documentation, IMDS/CAMDS compliance, and zero-defect methodology-making it suitable for on-board chargers, battery management systems, and traction inverters.
What are the supply voltage requirements for SI8645ET-ASR?
SI8645ET-ASR operates with independent 2.5–5.5 V supplies on both sides: VDD1 powers the input circuitry and VDD2 powers the output drivers. Each supply requires a local 0.1 µF bypass capacitor placed adjacent to the respective VDD/GND pins.
SI8645ET-ASR 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:
- Capacitive 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-ASR FAQ
1.How can I place an order for SI8645ET-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8645ET-ASR 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-ASR reliable?
The price and inventory of SI8645ET-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645ET-ASR is usually 5 days.
3.What payment methods are accepted for SI8645ET-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645ET-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8645ET-ASR?
SI8645ET-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8645ET-ASR 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-ASR?
For technical support, including SI8645ET-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645ET-ASR requirements.
6.How does Aetrix verify that SI8645ET-ASR is sourced from the original manufacturer or authorized distributors?
All SI8645ET-ASR 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-ASR meets industry standards.
7.What is the process for return or replacement of SI8645ET-ASR?
All SI8645ET-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8645ET-ASR, 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-ASR part is unused and in its original packaging.
Return procedure for SI8645ET-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8645ET-ASR 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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