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Skyworks Solutions Inc. SI8641BD-AS2R
- Part No.:
- SI8641BD-AS2R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8641BD-AS2R.pdf
- Description:
- AUTOMOTIVE 5 KV 3 FORWARD & 1 RE
- Quantity:
- Payment:
- Shipping:
Inventory:4,318
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Product details
Overview
SI8641BD-AS2R from Skyworks is a quad-channel digital isolator with 3 input channels on VDD1 side and 1 output channel on VDD2 side, 5 kVRMS reinforced isolation rating, 150 Mbps data rate, and selectable low-default fail-safe mode. It operates across –40 to 125 °C and supports 2.5–5.5 V dual supplies for industrial motor control and isolated power supply monitoring.
For engineers reviewing the SI8641BD-AS2R datasheet, SI8641BD-AS2R pinout, SI8641BD-AS2R application, or SI8641BD-AS2R equivalent, this page delivers verified timing specs (8 ns typical propagation delay), power data (7.3 mA at 100 Mbps, 5 V), isolation certification (VDE 0884-10, UL 1577), and automotive-grade compatibility (AEC-Q100 qualified).
Technical Context
The SI8641BD-AS2R implements RF-based on/off keying across a silicon dioxide isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical components. Its architecture supports independent undervoltage lockout (UVLO) on both sides with 70 mV hysteresis and Schmitt-trigger inputs for >0.44 V hysteresis.
It features two enable inputs (EN1 on VDD1 side for A4; EN2 on VDD2 side for B1–B3), allowing independent tri-state control of input and output channels. The device maintains <2.5 ns channel-channel skew and 5 ns minimum pulse width under full temperature and voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels / Direction | 4-channel, 3:1 unidirectional (A1–A3 → B1–B3; A4 ← B4) |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like SPI clock lines and isolated UART at 10+ Mbps |
| Propagation Delay | 8 ns typical - enables tight timing budgets in real-time motor gate drivers and ADC sampling sync |
| Isolation Rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, suitable for 600 VAC industrial bus isolation |
| Supply Voltage Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends |
| Fail-Safe Default | Low - ensures safe shutdown state during VDD1 loss in power inverter control logic |
| CMTI | 60 kV/µs typical - suppresses false triggering in high-dv/dt environments like IGBT gate drive circuits |
Pinout & Package
SI8641BD-AS2R uses a 16-pin wide-body SOIC package (WB SOIC-16, -IS2 variant) with 8 mm creepage, RoHS-compliant, JEDEC MS-013 compliant, and peak reflow rated to 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 3.3 V or 5 V to input-side logic and RF transmitter; requires 0.1 µF bypass capacitor |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8 mm creepage for safety compliance |
| A1–A3 | Digital inputs (VDD1 side) | Accept 2.0 V min VIH; Schmitt-triggered for >0.44 V noise margin against EMI in motor drive PCBs |
| A4 | Input with EN1 control | Tri-stated when EN1 = L; used for bidirectional handshake or clock enable in isolated comms |
| EN1 | Enable for A4 output | Pulled up internally; drives A4 into high-Z when low - enables multiplexing or power-gating of one channel |
| VDD2 | Output-side power supply | Independent 2.5–5.5 V rail; powers RF receiver and output drivers; bypass required |
| GND2 | Output-side ground reference | Isolated return for VDD2; forms reinforced insulation barrier with GND1 |
| B1–B3 | Digital outputs (VDD2 side) | 50 Ω nominal output impedance; compatible with 50 Ω PCB traces for clean 150 Mbps signal integrity |
| B4 | Output with EN2 control | Driven only when EN2 = H; defaults low during VDD1 loss - critical for safe fault signaling |
| EN2 | Enable for B1–B3 outputs | Active-high control on VDD2 side; disables all three outputs simultaneously into high-Z state |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Silicon dioxide dielectric enables 60-year lifetime at rated working voltage and eliminates LED aging concerns |
| Tri-state enable architecture | Separate EN1 (for A4) and EN2 (for B1–B3) allow granular channel control without external logic |
| Fail-safe default output | Low-default state ensures motor gate drivers disable safely during primary-side power loss |
| Ultra-low power at 100 Mbps | 7.3 mA per side at 5 V, 100 Mbps - reduces thermal load in sealed industrial enclosures |
| High CMTI | 60 kV/µs immunity prevents metastability in noisy 600 VDC bus environments (e.g., solar inverters) |
Applications
| Motor Control Gate Driver Isolation | Isolated ADC/DAC Interface |
|---|---|
Use Scenario: Isolating PWM signals between MCU and IGBT/SiC gate driver ICs in servo drives and EV traction inverters. IC Role / Device Role / Timing Role: SI8641BD-AS2R transmits three phase-control signals (A1–A3 → B1–B3) and receives fault feedback (B4 → A4) with <8 ns propagation delay matching. Use Value: Enables precise dead-time control and fast fault response (<12 ns default-output assertion) while meeting reinforced 5 kVRMS isolation for 690 VAC systems. |
Use Scenario: Connecting isolated sigma-delta ADCs (e.g., AMC1306) to host MCU across high-voltage domains in battery management systems. IC Role / Device Role / Timing Role: SI8641BD-AS2R carries oversampled bitstream data (A1–A3) and clocks (A4) to isolated ADC, with B4 returning ready/status. Use Value: Maintains 150 Mbps throughput for 24-bit ADCs at 20 MSPS while rejecting common-mode transients up to 60 kV/µs near battery cell stacks. |
| Industrial PLC Digital I/O Module | On-Board Charger (OBC) Control |
Use Scenario: Providing isolated digital input conditioning for 24 V DC field sensors and isolated relay/SSR drive in modular PLC backplanes. IC Role / Device Role / Timing Role: SI8641BD-AS2R routes three sensor inputs (A1–A3) and one diagnostic LED control (A4) across isolation barrier to controller side (B1–B4). Use Value: Delivers 5 kVRMS reinforced isolation certified to IEC 60950-1 and VDE 0884-10, enabling single-component isolation for SIL2-compliant modules. |
Use Scenario: Isolating bidirectional communication (UART, CAN) and status signals between OBC's high-voltage DC-DC stage and low-voltage MCU domain. IC Role / Device Role / Timing Role: SI8641BD-AS2R carries HV-side fault flags (A1–A3) and enables HV-side watchdog reset (B4), with EN2 disabling outputs during HV fault. Use Value: AEC-Q100 qualified operation at 125 °C ambient and automotive PPAP support simplify ISO 26262 ASIL-B system certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM2401ARWZ | 4-channel, 1:3 direction, 25 kV/µs CMTI, 25 Mbps max, SOIC-16 NB | Limited to 25 Mbps - unsuitable for high-speed SPI or isolated USB bridge use cases requiring 100+ Mbps | Select ADUM2401ARWZ only if data rate ≤25 Mbps and cost sensitivity outweighs CMTI and speed requirements. |
| ISO6741QDWR | 4-channel, 3:1 direction, 50 kV/µs CMTI, 50 Mbps max, SOIC-16 WB | Lower 50 Mbps data rate and no AEC-Q100 qualification - excludes automotive OBC and traction inverter use | Choose ISO6741QDWR for industrial AC-DC supplies where 50 Mbps suffices and automotive qualification is unnecessary. |
Compared with ADUM2401ARWZ and ISO6741QDWR, SI8641BD-AS2R delivers 3× higher data rate (150 Mbps), 20–40% higher CMTI (60 kV/µs), and automotive qualification - making it the only option for next-generation EV power electronics requiring fast, robust, and certified isolation.
Availability
SI8641BD-AS2R is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and on-board chargers requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for SI8641BD-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 high-reliability applications.
The Si864x family was engineered for high-noise industrial and automotive power systems, delivering reinforced isolation, ultra-low power, and AEC-Q100 qualification in compact SOIC packages - specifically targeting EV traction inverters and isolated power supply control.
FAQ
What is the isolation rating and safety certification of SI8641BD-AS2R?
SI8641BD-AS2R provides 5 kVRMS reinforced isolation and is certified to UL 1577 (1 minute), VDE 0884-10 (reinforced), CSA 5A, and CQC GB4943.1. These certifications validate its use in industrial equipment requiring basic and reinforced insulation per IEC 62368-1 and IEC 60601-1 standards. SI8641BD-AS2R meets creepage/clearance requirements for 600 VAC working voltage applications.
Does SI8641BD-AS2R support automotive applications?
Yes, SI8641BD-AS2R is AEC-Q100 qualified (Grade 1, –40 to 125 °C), manufactured using automotive-specific process flows, and supported with AIAG-compliant PPAP documentation and IMDS/CAMDS listings. Its 5 kVRMS reinforced isolation and 60 kV/µs CMTI make SI8641BD-AS2R suitable for on-board chargers, battery management systems, and traction inverters in BEV/HEV platforms.
How does the fail-safe default output function in SI8641BD-AS2R?
SI8641BD-AS2R is ordered with low-default fail-safe mode, meaning B1–B3 assert logic low within 12 ns when VDD1 is unpowered but VDD2 remains active. This behavior ensures safe shutdown of downstream gate drivers or relays during primary-side power loss. The default state is fixed by part number and cannot be changed in-circuit.
What are the supply current requirements of SI8641BD-AS2R at 100 Mbps?
At 100 Mbps, 5 V operation, and 15 pF load, SI8641BD-AS2R draws 7.3 mA on VDD1 and 14.3 mA on VDD2 (typical). Total active current is ~21.6 mA, enabling efficient thermal design in space-constrained industrial modules. Current scales linearly with data rate and drops to 1.4 mA per side at 1 Mbps.
Can SI8641BD-AS2R replace optocouplers in existing designs?
Yes, SI8641BD-AS2R replaces legacy optocouplers with superior performance: no LED aging, 150 Mbps vs. <10 Mbps, 8 ns propagation delay vs. >100 ns, and 60 kV/µs CMTI vs. <15 kV/µs. Its SOIC-16 WB footprint matches industry-standard optocoupler footprints, and Schmitt-trigger inputs eliminate need for external hysteresis resistors - simplifying SI8641BD-AS2R drop-in upgrades.
SI8641BD-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:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- 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
SI8641BD-AS2R FAQ
1.How can I place an order for SI8641BD-AS2R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8641BD-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 SI8641BD-AS2R reliable?
The price and inventory of SI8641BD-AS2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8641BD-AS2R is usually 5 days.
3.What payment methods are accepted for SI8641BD-AS2R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8641BD-AS2R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8641BD-AS2R?
SI8641BD-AS2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8641BD-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 SI8641BD-AS2R?
For technical support, including SI8641BD-AS2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8641BD-AS2R requirements.
6.How does Aetrix verify that SI8641BD-AS2R is sourced from the original manufacturer or authorized distributors?
All SI8641BD-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 SI8641BD-AS2R meets industry standards.
7.What is the process for return or replacement of SI8641BD-AS2R?
All SI8641BD-AS2R units undergo pre-shipment inspection (PSI). If there is an issue with SI8641BD-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 SI8641BD-AS2R part is unused and in its original packaging.
Return procedure for SI8641BD-AS2R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8641BD-AS2R Tags
-
ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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