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Skyworks Solutions Inc. SI8641BT-ASR
- Part No.:
- SI8641BT-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8641BT-ASR.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:2,737
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Product details
Overview
SI8641BT-ASR from Skyworks is a quad-channel, 3-input/1-output digital isolator with reinforced 5 kVRMS isolation, 150 Mbps data rate, <10 ns propagation delay, and AEC-Q100 automotive qualification. It provides fail-safe low-default output, Schmitt-trigger inputs, and tri-state enable control for isolated communication in high-noise motor control and battery management systems.
For engineers reviewing the SI8641BT-ASR datasheet, SI8641BT-ASR pinout, SI8641BT-ASR application, or SI8641BT-ASR equivalent, key selection criteria include its 5 kVRMS reinforced VDE 0884-10 rating, 3.3/5 V dual-supply operation, channel asymmetry (3 input-side + 1 output-side channels), and automotive-grade temperature range (–40 to 125 °C).
Technical Context
The SI8641BT-ASR implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering superior CMTI (≥60 kV/µs) versus optocouplers. Its asymmetric channel configuration (3 channels from VDD1 side, 1 from VDD2 side) enables bidirectional signal routing across isolation boundaries without external logic.
It features two independent enable inputs (EN1 on VDD1 side, EN2 on VDD2 side), supporting selective tri-state control of A4 (EN1) and B1–B3 (EN2). Fail-safe default-low behavior activates during VDD1 loss while VDD2 remains powered, ensuring deterministic system state in power-fail scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed SPI, RS-485, and CAN FD isolation without timing bottlenecks. |
| Isolation rating | 5 kVRMS, reinforced per VDE 0884-10 - certified for functional safety in EV traction inverters and OBCs. |
| Propagation delay | Typ. 8 ns, max 13 ns - enables sub-10 ns timing-critical feedback loops in digital power controllers. |
| Channel configuration | 3 input-side (A1–A3), 1 output-side (A4) channels - optimizes I/O mapping for asymmetric interfaces like isolated ADC readback + status reporting. |
| Supply voltage | 2.5–5.5 V on both sides - interoperable with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| CMTI | Min 60 kV/µs - maintains signal integrity in high-dV/dt environments such as IGBT gate drivers and motor phase legs. |
| Temperature range | –40 to 125 °C - qualified per AEC-Q100 Grade 1 for under-hood and battery-pack applications. |
Pinout & Package
SI8641BT-ASR uses a RoHS-compliant wide-body SOIC-16 package (WB SOIC-16, -AS suffix), providing 8 mm creepage and reinforced insulation for 5 kVRMS operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for A1–A3 inputs and EN1; must be ≥2.5 V for valid logic operation. |
| GND1 | Input-side ground | Reference for A1–A3 and EN1; requires local 0.1 µF bypass capacitor. |
| A1–A3 | Input channels | 3 unidirectional digital inputs referenced to VDD1/GND1; Schmitt-triggered for noise immunity. |
| EN1 | Enable for A4 | Active-high control: drives A4 output into high-impedance when low; internal pull-up to VDD1. |
| VDD2 | Output-side supply | Power for B1–B3 outputs and EN2; independent of VDD1 for true galvanic isolation. |
| GND2 | Output-side ground | Reference for B1–B3 and EN2; separate from GND1 to maintain isolation barrier integrity. |
| B1–B3 | Output channels | 3 unidirectional outputs referenced to VDD2/GND2; default-low during VDD1 loss. |
| EN2 | Enable for B1–B3 | Active-high control: disables all three B outputs simultaneously into high-Z; internal pull-up to VDD2. |
| A4 | Asymmetric output | Single output driven from VDD1 side; used for reverse-direction signaling (e.g., fault acknowledgment). |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced VDE 0884-10 certification | Enables single-package isolation for functional safety architectures (e.g., ISO 26262 ASIL-B/C) without external redundancy. |
| Selectable fail-safe default-low mode | Guarantees known logic state at B1–B3 during input-side power loss-critical for disabling gate drivers in fault conditions. |
| Tri-state enable with independent controls | EN1 and EN2 allow dynamic, side-specific output gating-enabling time-multiplexed bus sharing across isolation boundary. |
| RF modulation architecture | Eliminates startup delay and clock dependency-ensures immediate data validity after power-on, unlike capacitive or transformer-based isolators. |
| Automotive-grade manufacturing flow | Full AEC-Q100 qualification with zero-defect methodology, PPAP documentation, and IMDS/CAMDS compliance for Tier-1 automotive programs. |
Applications
| Motor Control Feedback Loop | Isolated Battery Cell Monitoring |
|---|---|
Use Scenario: Real-time current/voltage sampling in 3-phase inverter gate driver stage with fast overcurrent shutdown response. IC Role / Device Role / Timing Role: Isolates PWM feedback signals (A1–A3) from controller and delivers fault acknowledgment (A4) across 5 kV barrier. Use Value: 8 ns propagation delay ensures <100 ns total loop latency; 60 kV/µs CMTI prevents false triggering during IGBT switching transients. | Use Scenario: Reading cell voltage and temperature telemetry from stacked Li-ion modules in BEV battery packs. IC Role / Device Role / Timing Role: Transfers ADC conversion results (B1–B3) from isolated sensing domain to MCU; A4 carries pack-level fault flag. Use Value: Default-low behavior forces safe "no-data" state if sensing domain loses power-preventing erroneous cell balancing commands. |
| On-Board Charger (OBC) Communication | Traction Inverter Control Interface |
Use Scenario: Isolating CAN FD or SPI communication between OBC's AC/DC controller and DC/DC auxiliary supply module. IC Role / Device Role / Timing Role: Carries bidirectional control/status data (A1–A3 → B1–B3) with A4 used for handshake synchronization. Use Value: 150 Mbps capability supports full CAN FD bit rates (5 Mbps); 5 kVRMS rating meets IEC 62109 and UL 62368-1 requirements. | Use Scenario: Interfacing MCU to isolated gate driver ICs in high-power SiC inverter stacks. IC Role / Device Role / Timing Role: Delivers isolated PWM enable/disable (B1–B3) and receives desaturation fault signals (A4) across reinforced barrier. Use Value: Reinforced VDE 0884-10 certification eliminates need for dual-channel redundancy; –40 to 125 °C operation matches inverter junction temperature profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8641BB-ASR | Same 3/1 channel count and WB SOIC-16 package, but rated for 2.5 kVRMS basic isolation (VDE 0884-10) instead of 5 kVRMS reinforced. | Suitable for non-safety-critical industrial automation where creepage >5.5 mm is not mandated. | Select SI8641BB-ASR only if system-level safety certification does not require reinforced insulation. |
| ISO7741FQDWRQ1 | TI's AEC-Q100 quad-channel isolator with 5 kVRMS reinforced rating, but fixed 4/0 channel split and no asymmetric A4 output. | Requires external logic to replicate A4 reverse-signaling function; lacks dedicated EN1 control for single-channel gating. | Choose ISO7741FQDWRQ1 only when symmetric 4-channel isolation suffices and board space allows added discrete logic. |
Compared with SI8641BB-ASR, SI8641BT-ASR provides higher isolation robustness for automotive safety-critical zones; compared with ISO7741FQDWRQ1, it offers native asymmetric I/O and dedicated per-channel enable-reducing BOM count and PCB area in bidirectional interface designs.
Availability
SI8641BT-ASR is available at Aetrix Electronics and suitable for automotive battery management systems, traction inverter control interfaces, on-board chargers, and industrial motor drives requiring stable component supply across extended temperature and high-reliability lifecycles.
Supply support for SI8641BT-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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for wireless, automotive, and industrial markets.
The SI864x family was designed specifically for high-reliability, high-speed digital isolation in automotive electrification and industrial power systems-emphasizing low power, precise timing, and safety-certified reinforced insulation.
FAQ
What is the isolation rating and certification status of the SI8641BT-ASR?
The SI8641BT-ASR provides 5 kVRMS reinforced isolation certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1. It meets IEC 62368-1 and IEC 60601-1 requirements for reinforced insulation. This certification applies specifically to the SI8641BT-ASR variant with wide-body SOIC-16 packaging and is documented in Skyworks' official safety reports for the Si864x family.
Does the SI8641BT-ASR support fail-safe operation, and how is it configured?
Yes, the SI8641BT-ASR has factory-configured fail-safe default-low output behavior. When VDD1 is unpowered but VDD2 remains active, B1–B3 outputs drive logic low within 12 ns (tSD). This behavior is fixed by ordering code ("BT" denotes default-low, "ET" denotes default-high) and cannot be changed in-circuit. The SI8641BT-ASR does not require external pull-down resistors to achieve this state.
What are the supply voltage requirements for SI8641BT-ASR operation?
The SI8641BT-ASR operates with independent 2.5–5.5 V supplies on both VDD1 and VDD2 sides. It supports mixed-voltage operation-for example, 3.3 V on VDD1 (microcontroller side) and 5 V on VDD2 (gate driver side). Undervoltage lockout triggers below 1.88 V (falling) and releases above 2.24 V (rising), ensuring clean startup and shutdown sequencing.
How does the enable functionality work on the SI8641BT-ASR?
The SI8641BT-ASR has two independent enable inputs: EN1 controls A4 output (VDD1 side), and EN2 controls B1–B3 outputs (VDD2 side). Both are active-high with internal pull-ups to their respective supplies. Driving EN1 low places A4 in high-impedance; driving EN2 low places B1–B3 in high-impedance. Enable-to-output delays are ≤11 ns (ten1) and ≤12 ns (ten2), enabling precise timing control in multiplexed interfaces.
Is the SI8641BT-ASR pin-compatible with other Si864x variants in the same package?
Yes, all Si864x devices in the wide-body SOIC-16 (-AS/-ASR) package share identical pinouts, including SI8641BT-ASR, SI8641BB-ASR, and SI8641ET-ASR. Pin functions (VDD1, GND1, A1–A3, EN1, VDD2, GND2, B1–B3, EN2, A4) are consistent across the family. Channel count and default output state differ by part number, but PCB layout and footprint remain interchangeable.
SI8641BT-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:
- 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
SI8641BT-ASR FAQ
1.How can I place an order for SI8641BT-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8641BT-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 SI8641BT-ASR reliable?
The price and inventory of SI8641BT-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8641BT-ASR is usually 5 days.
3.What payment methods are accepted for SI8641BT-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8641BT-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8641BT-ASR?
SI8641BT-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8641BT-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 SI8641BT-ASR?
For technical support, including SI8641BT-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8641BT-ASR requirements.
6.How does Aetrix verify that SI8641BT-ASR is sourced from the original manufacturer or authorized distributors?
All SI8641BT-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 SI8641BT-ASR meets industry standards.
7.What is the process for return or replacement of SI8641BT-ASR?
All SI8641BT-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8641BT-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 SI8641BT-ASR part is unused and in its original packaging.
Return procedure for SI8641BT-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8641BT-ASR 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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