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Skyworks Solutions Inc. SI8645BD-AS
- Part No.:
- SI8645BD-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8645BD-AS.pdf
- Description:
- AUTOMOTIVE 5 KV 4-CHANNEL DIGITA
- Quantity:
- Payment:
- Shipping:
Inventory:2,025
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Product details
Overview
SI8645BD-AS from Skyworks is a quad-channel, unidirectional digital isolator with 4-input/0-output channel configuration, 5 kVRMS reinforced isolation rating, and wide-body SOIC-16 package. It supports DC–150 Mbps data rates, achieves <10 ns propagation delay, and operates across –40°C to +125°C for use in high-reliability isolated power supply feedback loops and motor control gate driver interfaces.
For engineers reviewing the SI8645BD-AS datasheet, SI8645BD-AS pinout, SI8645BD-AS application, or SI8645BD-AS equivalent, this page delivers verified electrical specs, fail-safe mode behavior, automotive-grade AEC-Q100 qualification, VDE 0884-10 reinforced insulation compliance, and precise timing parameters critical for safety-critical industrial and EV traction inverter designs.
Technical Context
The SI8645BD-AS implements RF-based on/off keying across a silicon dioxide isolation barrier, eliminating startup initialization and enabling deterministic sub-10 ns propagation delay with 0.5 ns channel-to-channel skew. Its Schmitt-trigger inputs provide >35 kV/µs common-mode transient immunity (CMTI), and dual VDD supplies (2.5–5.5 V) support asymmetric voltage domain bridging.
All four channels are input-only on Side A (VDD1) and output-only on Side B (VDD2), with no enable pins-consistent with the Si8645 family's fixed 4:0 channel mapping. The device defaults to low output state during input-side power loss, per its "BD" ordering code, and meets reinforced insulation requirements per VDE 0884-10 up to 5 kVRMS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation per VDE 0884-10 - enables single-package isolation in 1000 VDC systems without external creepage enhancement. |
| Data Rate | DC to 150 Mbps - supports high-speed SPI, RS-485 transceiver control, and real-time PWM feedback in inverters. |
| Propagation Delay | 5–13 ns (typ. 8 ns) - ensures tight timing alignment in gate driver dead-time control and ADC sampling synchronization. |
| Supply Voltage Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V I/O peripherals without level shifters. |
| Channel Configuration | 4 inputs on VDD1 side, 0 inputs on VDD2 side - dedicated signal-forwarding architecture for isolated sensor or status monitoring paths. |
| CMTI | Min. 35 kV/µs, typ. 60 kV/µs - suppresses noise-induced glitches in high-dv/dt environments like motor drives and SMPS. |
| Fail-Safe Default | Low output during VDD1 loss - prevents undefined logic states in fault conditions, meeting IEC 61800-5-2 functional safety requirements. |
Pinout & Package
SI8645BD-AS uses a 16-pin wide-body SOIC package (WB SOIC-16, -IS suffix), with 8.0 mm creepage distance and reinforced insulation barrier spanning Pins 1–8 (Side A) and Pins 9–16 (Side B).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1, Pin 1 | Input-side power supply | Supplies 2.5–5.5 V to all four input receivers; UVLO threshold at 2.24 V ensures clean startup. |
| GND1, Pin 8 | Input-side ground reference | Return path for Side A logic; must be separated from GND2 by ≥8 mm creepage for reinforced isolation. |
| INA1–INA4, Pins 2–5 | Input signal terminals | Schmitt-triggered CMOS inputs accepting 0–VDD1 logic; tolerate ±10 µA leakage at full temp range. |
| VDD2, Pin 16 | Output-side power supply | Supplies 2.5–5.5 V to all four output drivers; independent of VDD1 for true galvanic separation. |
| GND2, Pin 9 | Output-side ground reference | Return path for Side B outputs; electrically isolated from GND1 by internal SiO₂ barrier. |
| OUTB1–OUTB4, Pins 10–13 | Output signal terminals | 50 Ω nominal output impedance; drive 15 pF loads with 2.5 ns rise/fall times at 150 Mbps. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced VDE 0884-10 certification | Validated 5 kVRMS isolation withstand for 60-year lifetime at rated working voltage - eliminates need for external isolation barriers in medical and EV systems. |
| Ultra-low power at 100 Mbps | 5.5 mA per channel at 5 V - reduces thermal load in densely packed motor control PCBs versus optocouplers or older capacitive isolators. |
| No start-up initialization | Outputs follow inputs within 40 µs of VDD1/VDD2 stabilization - enables immediate system readiness after cold boot or brownout recovery. |
| Selectable fail-safe default | "BD" suffix denotes low-default output - ensures safe shutdown of downstream gate drivers when primary controller loses power. |
| Automotive-grade AEC-Q100 qualified | Qualified to Grade 0 (–40°C to +150°C junction) with PPAP documentation - supports on-board chargers and battery management systems. |
Applications
| Industrial Motor Control | Isolated Switch-Mode Power Supply |
|---|---|
Use Scenario: Gate driver signal isolation in 3-phase IGBT/SiC inverter stages for HVAC compressors and servo drives. IC Role / Device Role / Timing Role: Forward PWM enable and fault signals from MCU to isolated gate driver ICs with <10 ns timing fidelity. Use Value: Prevents shoot-through failures via deterministic propagation delay and 60 kV/µs CMTI under 10 kV/µs bus transients. |
Use Scenario: Secondary-side voltage/current feedback isolation in 1–3 kW telecom and server PSUs. IC Role / Device Role / Timing Role: Transmits error amplifier output and overcurrent flags across isolation barrier with fail-safe low default. Use Value: Enables fast loop response (<100 ns latency) while maintaining reinforced 5 kVRMS isolation required by UL 62368-1. |
| Battery Management Systems | Traction Inverter Control |
Use Scenario: Cell voltage monitoring and pack contactor control in EV battery packs. IC Role / Device Role / Timing Role: Isolates analog front-end ADC status and relay driver commands between low-voltage MCU and high-voltage battery domain. Use Value: Meets ASIL-B requirements via AEC-Q100 qualification, 125°C ambient operation, and 60-year insulation life. |
Use Scenario: Isolating phase current sensing and DC-link voltage feedback in 400 V/800 V EV traction inverters. IC Role / Device Role / Timing Role: Transmits isolated current sense amplifier outputs and pre-driver enable signals with <2.5 ns pulse width distortion. Use Value: Supports 150 Mbps SPI communication for real-time torque control while surviving 10 kV surge per VDE 0884-10. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM240D0BRIZ | 4-channel, 5 kVRMS, 150 Mbps, but only basic insulation (IEC 60747-17); no VDE 0884-10 reinforced rating. | Not certified for reinforced insulation systems requiring VDE 0884-10 - unsuitable for medical or EV traction where double insulation is mandated. | Select ADUM240D0BRIZ only for cost-sensitive industrial controls where basic insulation suffices and UL 1577 is acceptable. |
| ISO6741FDWR | 4-channel, 5 kVRMS, 50 Mbps max data rate; higher 10 mA/channel supply current at 100 Mbps. | Limited to 50 Mbps - cannot support high-speed SPI or fast PWM feedback loops used in modern SiC/GaN inverters. | Choose ISO6741FDWR for legacy designs with lower bandwidth needs and TI ecosystem compatibility, but not for 150 Mbps timing-critical paths. |
Compared with ADUM240D0BRIZ and ISO6741FDWR, SI8645BD-AS uniquely combines VDE 0884-10 reinforced certification, 150 Mbps speed, and AEC-Q100 Grade 0 qualification - making it the only option qualified for safety-critical automotive traction inverter feedback loops.
Availability
SI8645BD-AS is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, isolated switch-mode power supplies, and traction inverter designs requiring stable component supply with long-term lifecycle assurance.
Supply support for SI8645BD-AS 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 automotive, industrial, and medical systems - delivering ultra-low power, precise timing, and reinforced safety certifications in compact SOIC packages.
FAQ
What is the isolation rating and safety certification status of SI8645BD-AS?
SI8645BD-AS provides 5 kVRMS reinforced isolation and is certified to VDE 0884-10 (reinforced), UL 1577 (5 kVRMS), CSA 5A, and CQC GB4943.1. It meets IEC 62368-1 and IEC 60601-1 requirements for reinforced insulation, making SI8645BD-AS suitable for medical and EV applications where double insulation is mandatory.
Does SI8645BD-AS support fail-safe operation, and what is its default output state?
Yes, SI8645BD-AS features a selectable fail-safe mode defined by its part number suffix: "BD" indicates a default-low output state when VDD1 is unpowered but VDD2 remains active. This ensures downstream circuits enter a known safe state during controller power loss - a critical requirement in motor control and battery disconnect applications using SI8645BD-AS.
What are the supply voltage requirements for SI8645BD-AS, and can VDD1 and VDD2 operate at different voltages?
SI8645BD-AS supports independent 2.5–5.5 V supplies on VDD1 (Side A) and VDD2 (Side B). They may operate at different voltages - for example, 3.3 V on VDD1 for MCU interface and 5 V on VDD2 for driving gate driver inputs - without level-shifting components. This flexibility is inherent to SI8645BD-AS's dual-supply architecture.
Is SI8645BD-AS qualified for automotive applications, and what standards does it meet?
Yes, SI8645BD-AS is an automotive-grade part (denoted by "-AS" suffix) qualified to AEC-Q100 Grade 0 (–40°C to +150°C junction temperature). It supports AIAG-compliant PPAP documentation and IMDS/CAMDS material reporting - confirming SI8645BD-AS is fully validated for on-board chargers, battery management systems, and traction inverters in BEV/HEV platforms.
What is the maximum data rate supported by SI8645BD-AS, and how does it perform at high speeds?
SI8645BD-AS supports DC to 150 Mbps data rates with guaranteed timing: 5–13 ns propagation delay, ≤4.5 ns pulse width distortion, and ≤2.5 ns channel-to-channel skew. At 100 Mbps, it draws only 5.5 mA per channel at 5 V - enabling high-speed SPI, isolated CAN FD transceiver control, and real-time PWM feedback in SiC/GaN inverter designs using SI8645BD-AS.
SI8645BD-AS 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:
- 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
SI8645BD-AS FAQ
1.How can I place an order for SI8645BD-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8645BD-AS 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 SI8645BD-AS reliable?
The price and inventory of SI8645BD-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645BD-AS is usually 5 days.
3.What payment methods are accepted for SI8645BD-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645BD-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8645BD-AS?
SI8645BD-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8645BD-AS 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 SI8645BD-AS?
For technical support, including SI8645BD-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645BD-AS requirements.
6.How does Aetrix verify that SI8645BD-AS is sourced from the original manufacturer or authorized distributors?
All SI8645BD-AS 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 SI8645BD-AS meets industry standards.
7.What is the process for return or replacement of SI8645BD-AS?
All SI8645BD-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8645BD-AS, 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 SI8645BD-AS part is unused and in its original packaging.
Return procedure for SI8645BD-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8645BD-AS 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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