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Skyworks Solutions Inc. SI8641BD-AS
- Part No.:
- SI8641BD-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8641BD-AS.pdf
- Description:
- AUTOMOTIVE 5 KV 3 FORWARD & 1 RE
- Quantity:
- Payment:
- Shipping:
Inventory:2,414
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Product details
Overview
SI8641BD-AS from Skyworks is a quad-channel digital isolator with 3 input channels on VDD1 side and 1 output channel on VDD2 side, rated for 5.0 kVRMS reinforced isolation in wide-body SOIC-16 package. It supports DC–150 Mbps data rates, achieves <10 ns propagation delay, and features selectable fail-safe low-default output state. It is AEC-Q100 qualified and used in battery management systems and traction inverters where high-voltage domain separation and automotive reliability are required.
For engineers reviewing the SI8641BD-AS datasheet, SI8641BD-AS pinout, SI8641BD-AS application, or SI8641BD-AS equivalent, this page delivers verified electrical specs, automotive-grade safety certifications (UL, VDE 0884-10, CQC), precise timing parameters (0.5 ns channel skew, 5 ns min pulse width), and real-world isolation use cases in EV powertrain subsystems.
Technical Context
The SI8641BD-AS implements RF-based on/off keying across a semiconductor isolation barrier-no optical components or start-up initialization required. Its architecture provides inherent noise immunity via Schmitt-trigger inputs and supports independent undervoltage lockout (UVLO) on both sides (VDD1/VDD2), with thresholds at 2.24 V (rising) and 2.16 V (falling).
It integrates two enable inputs (EN1 on VDD1 side, EN2 on VDD2 side) to control tri-state outputs independently: EN1 disables A4; EN2 disables B1–B3. Fail-safe behavior defaults to logic low when VDD1 is unpowered but VDD2 remains active-confirmed by ordering option "BD" (Low default, 5.0 kV, WB SOIC-16).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5.0 kVRMS reinforced insulation per UL 1577 and VDE 0884-10; enables direct interface between 1000 VDC bus and MCU logic domains. |
| Max Data Rate | 150 Mbps-supports high-speed CAN FD, SPI, or PWM feedback loops in motor control without signal degradation. |
| Propagation Delay | 8.0 ns typical-ensures sub-10 ns timing alignment critical for gate driver synchronization in SiC/GaN inverters. |
| Channel-Channel Skew | 0.5 ns max-guarantees tight timing correlation across isolated signals in multi-phase current sensing. |
| Supply Voltage Range | 2.5–5.5 V on both sides-allows interoperability with 3.3 V MCUs and 5 V analog front-ends without level shifters. |
| CMTI | 60 kV/µs minimum-rejects fast common-mode transients induced by high di/dt switching in power converters. |
| Fail-Safe Default | Logic low output during VDD1 loss-prevents unintended activation of downstream drivers in fault conditions. |
Pinout & Package
SI8641BD-AS uses a 16-pin wide-body SOIC package (WB SOIC-16, -IS suffix), providing 8 mm creepage distance and reinforced insulation for 5.0 kVRMS operation. Pin assignments follow Skyworks' standard Si864x layout with dual-side power/ground separation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for channels A1–A3 and EN1; must be ≥2.5 V for valid input sampling. |
| GND1 | Input-side ground | Reference return for VDD1 and all A-side signals; requires dedicated low-impedance plane. |
| A1–A3 | Input channels | Digital inputs referenced to VDD1/GND1; Schmitt-triggered for >0.44 V hysteresis against EMI. |
| EN1 | Enable for A4 output | Active-high control on VDD1 side; drives A4 into high-Z when low-used for multiplexed diagnostics. |
| VDD2 | Output-side supply | Power for B1–B3 outputs and EN2; independent of VDD1 for true galvanic isolation. |
| GND2 | Output-side ground | Reference for VDD2 and B-side outputs; physically separated from GND1 by isolation barrier. |
| B1–B3 | Output channels | CMOS outputs referenced to VDD2/GND2; 50 Ω nominal impedance for controlled-impedance routing. |
| EN2 | Enable for B1–B3 | Active-high control on VDD2 side; disables all three B outputs simultaneously into high-Z state. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; enables stable 60-year lifetime at rated voltage. |
| Tri-state outputs with dual enables | EN1 and EN2 allow independent high-impedance control of A4 and B1–B3-enables shared-bus arbitration and safe power sequencing. |
| Selectably low-fail-safe mode | "BD" ordering code guarantees default-low output during VDD1 loss-critical for fail-safe gate driver disable in EV inverters. |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C), AIAG-compliant PPAP, IMDS/CAMDS support-meets OEM BMS and OBC requirements. |
| Ultra-low power at 100 Mbps | 7.3 mA (VDD1) / 14.3 mA (VDD2) typical at 100 Mbps-reduces thermal load in densely packed power modules. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
Use Scenario: Isolating cell voltage monitoring ADCs and pack contactor control signals in 800 V EV battery packs. IC Role / Device Role / Timing Role: SI8641BD-AS transfers analog front-end status and MCU commands across 5.0 kVRMS barrier while maintaining <10 ns timing integrity. Use Value: Prevents ground loop errors and enables safe hot-swap diagnostics without compromising ASIL-B functional safety compliance. |
Use Scenario: Transmitting PWM gate drive signals and fault feedback between SiC half-bridge drivers and MCU in high-power traction inverters. IC Role / Device Role / Timing Role: SI8641BD-AS carries three phase-current sense signals (A1–A3) and one isolated enable (EN1 → A4) to gate driver ICs. Use Value: 0.5 ns channel skew ensures synchronized switching across phases, reducing torque ripple and EMI in 20 kHz+ switching applications. |
| On-Board Charger (OBC) | Industrial Motor Drive |
Use Scenario: Isolating communication between AC/DC PFC controller and DC/DC LLC controller in bi-directional OBCs. IC Role / Device Role / Timing Role: SI8641BD-AS conveys digital control signals and fault flags across isolation boundary with 150 Mbps capability. Use Value: Enables real-time coordinated control of dual-stage conversion while meeting IEC 62368-1 reinforced insulation requirements. |
Use Scenario: Providing isolated feedback for current/voltage sensing and gate drive enable in servo drives operating up to 690 VAC. IC Role / Device Role / Timing Role: SI8641BD-AS interfaces isolated sigma-delta modulators (A1–A3) and delivers isolated enable to IGBT gate drivers (B1–B3). Use Value: 60 kV/µs CMTI withstands rapid bus transients during short-circuit events, preventing false triggering in industrial environments. |
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 directionality; 2.5 kVRMS basic isolation; no automotive qualification; 25 ns propagation delay. | Suitable for industrial automation where reinforced isolation and AEC-Q100 are not required. | Choose ADUM2401ARWZ only if 2.5 kV rating and non-automotive qualification are acceptable; SI8641BD-AS offers superior speed, safety, and automotive compliance. |
| ISO7741FDWR | 4-channel, 3:1 directionality; 5.0 kVRMS reinforced; 105 Mbps max rate; 11 ns propagation delay; no AEC-Q100. | Fits cost-sensitive industrial designs needing 5 kV isolation but lacking automotive validation. | Select ISO7741FDWR when automotive qualification is unnecessary and 105 Mbps suffices; SI8641BD-AS delivers higher speed, lower skew, and full automotive support. |
Compared with ADUM2401ARWZ and ISO7741FDWR, SI8641BD-AS uniquely combines AEC-Q100 Grade 1 qualification, 150 Mbps bandwidth, <10 ns propagation delay, and 5.0 kVRMS reinforced isolation-making it the only drop-in solution for high-performance EV powertrain applications requiring both safety certification and timing precision.
Availability
SI8641BD-AS is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and industrial motor drives requiring stable component supply with automotive-grade traceability and long-term lifecycle assurance.
Supply support for SI8641BD-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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for wireless, automotive, and industrial markets.
The Si864x family was engineered specifically for high-reliability, high-speed digital isolation in electric vehicle power systems and industrial automation-delivering RF-based robustness, AEC-Q100 compliance, and reinforced safety certification out-of-the-box.
FAQ
What is the isolation rating and safety certification status of SI8641BD-AS?
SI8641BD-AS is rated for 5.0 kVRMS reinforced isolation and certified to UL 1577, VDE 0884-10 (reinforced), CSA 5A, CQC GB4943.1, and IEC 62368-1. These approvals validate its use in safety-critical automotive and industrial systems where double insulation is mandated.
Does SI8641BD-AS support fail-safe operation, and how is it configured?
Yes-SI8641BD-AS has a factory-configured fail-safe mode that defaults outputs to logic low when VDD1 is unpowered but VDD2 remains active. This behavior is fixed by the "BD" ordering code and requires no external configuration or pull resistors.
What are the supply voltage requirements for SI8641BD-AS operation?
SI8641BD-AS operates with independent 2.5–5.5 V supplies on both sides: VDD1 powers inputs A1–A3 and EN1; VDD2 powers outputs B1–B3 and EN2. Each side has its own UVLO threshold (2.16 V falling, 2.24 V rising) to ensure clean startup and shutdown.
How does the enable functionality work on SI8641BD-AS?
SI8641BD-AS features two independent enable inputs: EN1 (on VDD1 side) controls output A4; EN2 (on VDD2 side) controls outputs B1–B3. When asserted high, they enable normal signal transmission; when low, they force the respective outputs into high-impedance state-enabling bus sharing and safe power sequencing.
Is SI8641BD-AS compatible with 1.8 V logic interfaces?
No-SI8641BD-AS does not support 1.8 V logic. Its input thresholds (VT+ = 1.67 V typ, VT– = 1.23 V typ) and supply range (2.5–5.5 V) require minimum 2.5 V operation. For 1.8 V systems, level-shifting circuitry or a different isolator family is required.
SI8641BD-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:
- 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-AS FAQ
1.How can I place an order for SI8641BD-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8641BD-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 SI8641BD-AS reliable?
The price and inventory of SI8641BD-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8641BD-AS is usually 5 days.
3.What payment methods are accepted for SI8641BD-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8641BD-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8641BD-AS?
SI8641BD-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8641BD-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 SI8641BD-AS?
For technical support, including SI8641BD-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8641BD-AS requirements.
6.How does Aetrix verify that SI8641BD-AS is sourced from the original manufacturer or authorized distributors?
All SI8641BD-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 SI8641BD-AS meets industry standards.
7.What is the process for return or replacement of SI8641BD-AS?
All SI8641BD-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8641BD-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 SI8641BD-AS part is unused and in its original packaging.
Return procedure for SI8641BD-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8641BD-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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