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Skyworks Solutions Inc. SI8641BC-AS1
- Part No.:
- SI8641BC-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8641BC-AS1.pdf
- Description:
- AUTOMOTIVE 3.75 KV 3 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:1,393
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Product details
Overview
SI8641BC-AS1 from Skyworks is a quad-channel digital isolator with 3 input channels on VDD1 side and 1 output channel on VDD2 side, providing reinforced 3.75 kVRMS isolation in narrow-body SOIC-16 package. It supports DC–150 Mbps data rates, achieves ≤10 ns propagation delay, and features selectable low-default fail-safe mode for power-loss scenarios - deployed in isolated motor control gate drivers and battery management system signal interfaces.
For engineers reviewing the SI8641BC-AS1 datasheet, SI8641BC-AS1 pinout, SI8641BC-AS1 application, or SI8641BC-AS1 equivalent, this page delivers verified electrical specs, validated pin functions, confirmed automotive-grade qualification (AEC-Q100), and real-world isolation barrier design considerations including creepage, CMTI ≥60 kV/µs, and fail-safe state behavior during undervoltage conditions.
Technical Context
The SI8641BC-AS1 implements RF-based on/off keying across a silicon-die isolation barrier, eliminating startup initialization and enabling deterministic timing without PLL lock time. Its architecture provides independent undervoltage lockout (UVLO) on both sides (VDD1/VDD2), with thresholds at 2.24 V (rising) and 2.16 V (falling), ensuring robust operation during brownout events.
All four channels integrate Schmitt-trigger inputs (VT+ = 1.67 V typ, VT– = 1.23 V typ) and tri-state outputs controlled by dedicated enable pins (EN1 on VDD1 side for A4; EN2 on VDD2 side for B1–B3). The device operates across –40 to +125 °C with supply voltage flexibility (2.5–5.5 V per side) and supports 15 pF capacitive loading per output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels & Direction | 3-input / 1-output asymmetric configuration (A1–A3 → B1–B3; A4 ← B4) |
| Isolation Rating | 3.75 kVRMS reinforced insulation, certified to UL 1577, VDE 0884-10 (basic), IEC 62368-1 |
| Max Data Rate | 150 Mbps - supports high-speed SPI, RS-485 transceiver control, and PWM feedback loops |
| Propagation Delay | 8.0 ns typical - enables sub-10 ns timing-critical gate drive synchronization |
| CMTI | ≥60 kV/µs - maintains signal integrity in noisy motor inverter and SMPS environments |
| Supply Range | 2.5–5.5 V per side - interoperable with 3.3 V microcontrollers and 5 V analog front-ends |
| Fail-Safe Default | Low-output state during VDD1 loss - prevents unintended activation of downstream MOSFETs or relays |
Pinout & Package
Narrow-body SOIC-16 (NB SOIC-16) package with 1.27 mm pitch, RoHS-compliant, JEDEC-standard 260 °C peak reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies logic and transmitter circuitry for A1–A4 inputs; UVLO monitoring active |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8 mm creepage for 3.75 kVRMS rating |
| A1–A3 | Digital input signals (VDD1 side) | Accept 2.5–5.5 V logic; Schmitt-triggered for noise immunity up to 50 kV/µs dV/dt |
| A4 | Input with EN1 control | Signal passes only when EN1 = high; otherwise forces A4 output into high-impedance |
| EN1 | Enable for A4 channel | Active-high control on VDD1 side; internally pulled up - tie to GND to disable A4 |
| VDD2 | Output-side power supply | Supplies receiver and driver circuitry for B1–B4; independent UVLO monitoring |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1; defines safety barrier |
| B1–B3 | Isolated output signals (VDD2 side) | Drive 50 Ω loads; 4 mA sink/source capability; default-low during VDD1 loss |
| B4 | Isolated output with EN2 control | Tri-stated when EN2 = low; follows A4 only when EN2 = high |
| EN2 | Enable for B4 channel | Active-high control on VDD2 side; enables/disables B4 output independently of other channels |
| NC | No-connect terminal | Not internally bonded; may be left floating, tied to VDD2, or grounded per layout needs |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; stable timing over –40 to +125 °C |
| Asymmetric 3:1 channel mapping | Optimizes PCB routing for unidirectional control + bidirectional status feedback in BMS and inverter systems |
| Independent dual-supply UVLO | Prevents metastable outputs when either side powers up/down asynchronously - critical for fault-tolerant designs |
| Reinforced 3.75 kVRMS rating | Meets reinforced insulation requirements per IEC 62368-1 and IEC 60601-1 for medical and industrial end-equipment |
| Automotive-grade qualification | AEC-Q100 Grade 1 qualified with AIAG PPAP support - suitable for OBC, BMS, and traction inverter subsystems |
Applications
| Battery Management System (BMS) | Motor Control Gate Driver Interface |
|---|---|
Use Scenario: Isolating cell voltage monitoring ADC signals and pack-level communication between MCU and analog front-end in EV battery packs. IC Role / Device Role / Timing Role: SI8641BC-AS1 transmits three analog monitor enable signals (A1–A3) to isolated ADCs and returns one fault status bit (B4) across the barrier. Use Value: 3.75 kVRMS reinforced isolation meets IEC 62619 requirements; 60 kV/µs CMTI rejects switching noise from adjacent IGBTs. | Use Scenario: Providing isolated gate drive enable/disable control and fault feedback between MCU and half-bridge driver ICs in servo inverters. IC Role / Device Role / Timing Role: SI8641BC-AS1 forwards three PWM enable commands (A1–A3) to upper/lower gate drivers and receives one DESAT fault signal (B4). Use Value: ≤10 ns propagation delay ensures synchronized turn-on/turn-off; low-default fail-safe prevents shoot-through during MCU reset. |
| Isolated Switch-Mode Power Supply (SMPS) | Industrial PLC Digital I/O Module |
Use Scenario: Transmitting feedback signals (voltage/current sense) and control commands (enable, soft-start) across primary-secondary barrier in 1–3 kW telecom rectifiers. IC Role / Device Role / Timing Role: SI8641BC-AS1 carries three secondary-side sensing signals (A1–A3) to primary-side controller and returns one overtemperature alert (B4). Use Value: 150 Mbps capability supports fast-loop digital control; 3.75 kVRMS rating satisfies UL 62368-1 reinforced insulation for Class II supplies. | Use Scenario: Isolating field-side digital inputs (limit switches, sensors) and PLC CPU-side control outputs in factory automation cabinets. IC Role / Device Role / Timing Role: SI8641BC-AS1 routes three discrete sensor inputs (A1–A3) to CPU and conveys one emergency stop confirmation (B4) back to field logic. Use Value: Schmitt-trigger inputs reject EMI in electrically noisy plant floors; AEC-Q100 qualification ensures long-term reliability under vibration and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8641BB-AS1 | Same 3:1 channel count and NB SOIC-16 package, but rated for 2.5 kVRMS (not 3.75 kVRMS) | Insufficient for reinforced insulation requirements in medical or high-voltage industrial systems | Select SI8641BB-AS1 only where 2.5 kVRMS basic insulation suffices and cost optimization is prioritized |
| ADUM4160BRWZ | Quad-channel, 2.5 kVRMS, 25 Mbps max rate, 35 ns propagation delay, SOIC-16 wide body | Lacks automotive qualification and fails to meet 150 Mbps or 10 ns timing needs in high-performance inverters | Choose ADUM4160BRWZ only for legacy USB-isolated peripheral designs requiring lower speed and non-automotive grade |
Compared with SI8641BB-AS1, SI8641BC-AS1 adds 1.25 kVRMS margin for reinforced insulation compliance; versus ADUM4160BRWZ, it delivers 6× higher data rate and 3.5× lower propagation delay while supporting AEC-Q100 automotive deployment - making it the sole option meeting both high-speed timing and safety-critical isolation requirements.
Availability
SI8641BC-AS1 is available at Aetrix Electronics and suitable for battery management systems, motor control gate drivers, and isolated switch-mode power supplies requiring stable component supply, long-lifecycle assurance, and automotive-grade traceability.
Supply support for SI8641BC-AS1 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 industrial and automotive isolation applications demanding low power, precise timing, and reinforced safety certification - not general-purpose signal coupling.
FAQ
What is the isolation voltage rating and safety certification status of SI8641BC-AS1?
SI8641BC-AS1 is rated for 3.75 kVRMS reinforced isolation and certified to UL 1577, CSA Component Notice 5A, IEC 62368-1, IEC 60601-1, and VDE 0884-10 (basic insulation). It meets reinforced insulation requirements for medical and industrial equipment where creepage and working voltage margins are critical. SI8641BC-AS1 does not carry VDE 0884-10 reinforced certification - that applies only to Si864xxT variants.
Does SI8641BC-AS1 support AEC-Q100 qualification and what grade is it rated for?
Yes, SI8641BC-AS1 is AEC-Q100 qualified Grade 1 (–40 to +125 °C ambient), manufactured using automotive-specific process flows with zero-defect methodology, AIAG-compliant PPAP documentation, and IMDS/CAMDS material declarations. This makes SI8641BC-AS1 suitable for on-board chargers, battery management systems, and traction inverters in EV/HEV platforms.
How does the fail-safe default output behavior work on SI8641BC-AS1?
SI8641BC-AS1 is ordered with low-default fail-safe mode: when VDD1 is unpowered (e.g., MCU reset or supply fault), all B1–B3 outputs default to logic low while B4 remains high-impedance if EN2 is inactive. This prevents unintended activation of downstream power stages. The default state is fixed by part number - SI8641EC-AS1 would provide high-default instead.
What are the enable pin configurations and their functional impact on SI8641BC-AS1 channels?
SI8641BC-AS1 has two enable pins: EN1 (on VDD1 side) controls A4-to-B4 transmission, and EN2 (on VDD2 side) controls B4 output drive. When EN1 = low, A4 is disabled and B4 enters high-impedance regardless of EN2. When EN2 = low, B4 is forced high-Z even if A4 is active. This allows independent control of status feedback path (B4) versus command paths (B1–B3).
Can SI8641BC-AS1 operate with mismatched supply voltages on VDD1 and VDD2 sides?
Yes, SI8641BC-AS1 supports independent 2.5–5.5 V operation on VDD1 and VDD2 - enabling direct interfacing between 3.3 V microcontrollers (VDD1) and 5 V gate drivers or analog circuits (VDD2). Each side has its own UVLO threshold (2.24 V rising), so asymmetric power sequencing is supported without data corruption or latch-up risk.
SI8641BC-AS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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:
- 3750Vrms
- 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
SI8641BC-AS1 FAQ
1.How can I place an order for SI8641BC-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8641BC-AS1 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 SI8641BC-AS1 reliable?
The price and inventory of SI8641BC-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8641BC-AS1 is usually 5 days.
3.What payment methods are accepted for SI8641BC-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8641BC-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8641BC-AS1?
SI8641BC-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8641BC-AS1 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 SI8641BC-AS1?
For technical support, including SI8641BC-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8641BC-AS1 requirements.
6.How does Aetrix verify that SI8641BC-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8641BC-AS1 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 SI8641BC-AS1 meets industry standards.
7.What is the process for return or replacement of SI8641BC-AS1?
All SI8641BC-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8641BC-AS1, 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 SI8641BC-AS1 part is unused and in its original packaging.
Return procedure for SI8641BC-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8641BC-AS1 Tags
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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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