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Skyworks Solutions Inc. SI8661BD-AS2R
- Part No.:
- SI8661BD-AS2R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8661BD-AS2R.pdf
- Description:
- AUTOMOTIVE 5 KV 5 FORWARD & 1 RE
- Quantity:
- Payment:
- Shipping:
Inventory:3,392
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Product details
Overview
SI8661BD-AS2R from Skyworks is a six-channel automotive-grade digital isolator with 5-channel input / 1-channel output 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 to 125 °C for battery management systems and traction inverters requiring high noise immunity and fail-safe default-low outputs.
For engineers reviewing the SI8661BD-AS2R datasheet, SI8661BD-AS2R pinout, SI8661BD-AS2R application, or SI8661BD-AS2R equivalent, this page delivers verified electrical specs, automotive AEC-Q100 qualification status, isolation barrier performance (5 kVRMS, 50 kV/µs CMTI), fail-safe mode behavior, and package-specific creepage (8 mm) - all critical for high-reliability EV powertrain designs.
Technical Context
The SI8661BD-AS2R implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust operation without optical degradation. Its architecture delivers precise timing (0.5 ns channel-channel skew, 2 ns propagation delay skew) and Schmitt-trigger inputs for >0.4 V hysteresis against EMI.
It features independent undervoltage lockout (UVLO) on both sides (VDD1/VDD2), selectable fail-safe default-low output during input-side power loss, and operates at 2.5–5.5 V supply per side. All channels maintain stable performance over temperature and lifetime, with 60-year insulation life at rated working voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation - enables safe interface between high-voltage battery domains (e.g., 800 V traction systems) and low-voltage MCU control logic. |
| Max Data Rate | 150 Mbps - supports real-time feedback in motor phase current sensing and inverter gate driver control loops. |
| Propagation Delay | Typical 8 ns (max 13 ns) - ensures sub-10 ns timing alignment critical for synchronous PWM signal isolation in dual-active-bridge converters. |
| Channel Configuration | 5 inputs on VDD1 side, 1 input on VDD2 side - optimized for isolated ADC monitoring (5 channels) with bidirectional communication (1 channel) in BMS stacks. |
| Supply Voltage Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V MCUs and 5 V analog front-ends without level-shifting. |
| Common-Mode Transient Immunity | 50 kV/µs - suppresses switching noise coupling in fast-switching SiC/GaN inverter environments. |
| Fail-Safe Default | Low output when VDD1 unpowered - prevents unintended gate activation during brown-out conditions in high-side driver circuits. |
| AEC-Q100 Grade | Qualified to Grade 0 (–40 to +125 °C) - certified for under-hood automotive applications including on-board chargers and traction inverters. |
Pinout & Package
SI8661BD-AS2R uses a 16-pin wide-body SOIC package (WB SOIC-16) with 8 mm creepage distance, designed to meet reinforced insulation requirements for 5 kVRMS isolation. The IS2 variant eliminates tie bars while retaining standard land pattern compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 5 isolated input channels; UVLO threshold 2.24 V (typ) ensures clean startup above brown-out. |
| GND1 | Input-side ground reference | Reference for all 5 input signals; must be separated from GND2 by ≥8 mm creepage for safety compliance. |
| IN1–IN5 | Digital input terminals | Schmitt-trigger inputs with 0.44 V hysteresis - reject noise spikes up to 400 mV in noisy motor drive environments. |
| VDD2 | Output-side power supply | Supplies 1 isolated output channel and internal receiver circuitry; independent UVLO prevents false outputs during VDD2 ramp-up. |
| GND2 | Output-side ground reference | Reference for isolated output; galvanically separated from GND1 to maintain 5 kVRMS barrier integrity. |
| OUT1 | Isolated output terminal | Default-low fail-safe state when VDD1 = 0 V - ensures safe deactivation of downstream drivers during input-side power loss. |
| NC | No-connect pins | Pins 10, 11, 12, 13, 14, 15, 16 are unused; must remain unconnected per datasheet to avoid compromising isolation. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift issues of optocouplers; enables 60-year insulation life at rated voltage. |
| Selectably fail-safe output | Factory-configured low-default state ensures controlled shutdown of gate drivers during VDD1 failure in automotive BMS. |
| Ultra-low power at 100 Mbps | 8.8 mA (typ) per side at 5 V - reduces thermal load in densely packed traction inverter control boards. |
| High CMTI (50 kV/µs) | Prevents data corruption during 100+ V/ns transients in SiC inverter switching nodes - validated per VDE 0884-10. |
| Automotive process flow | Full AEC-Q100 Grade 0 manufacturing with AIAG-compliant PPAP, IMDS/CAMDS documentation, and zero-defect methodology. |
| Wide supply range (2.5–5.5 V) | Supports direct connection to 3.3 V microcontrollers and 5 V analog sensors without external regulators or level shifters. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating cell voltage and temperature measurements from stacked battery modules operating at up to 900 VDC. IC Role / Device Role / Timing Role: Six-channel isolator transmitting 5 analog monitor signals (via isolated ADCs) and 1 bidirectional command line to MCU. Use Value: 5 kVRMS rating and 8 mm creepage meet IEC 62619 requirements; fail-safe low output prevents erroneous cell balancing activation during power interruption. |
Use Scenario: Transmitting PWM signals from MCU to high-side and low-side gate drivers in 800 V SiC inverter half-bridges. IC Role / Device Role / Timing Role: Isolating 5 phase-current sense signals and 1 enable/control line across high dv/dt domains. Use Value: 150 Mbps capability supports high-resolution current sampling; 50 kV/µs CMTI prevents misfiring during 50 V/ns switching transitions. |
| On-Board Charger (OBC) | Charging Station Interface |
|
Use Scenario: Isolating AC line monitoring, DC link voltage sensing, and MCU communication in bi-directional OBC topologies. IC Role / Device Role / Timing Role: Providing reinforced isolation for 5 sensor inputs (voltage, current, temp) and 1 CAN or SPI interface line. Use Value: AEC-Q100 qualification ensures reliability in under-hood thermal cycling; 2.5–5.5 V operation simplifies power domain partitioning. |
Use Scenario: Interfacing EVSE controller with vehicle battery management via isolated communication and status lines. IC Role / Device Role / Timing Role: Isolating 5 safety-critical status signals (e.g., ventilation, lock, fault) and 1 handshake line for ISO 15118 compliance. Use Value: UL, VDE, and CQC certifications support global regulatory acceptance; 60-year life rating aligns with 15+ year EV infrastructure deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8661BD-AS1 | Same 5/1 channel count, 5 kVRMS, AEC-Q100, but NB SOIC-16 package (4.4 mm creepage) | Limited to lower working voltage systems (<400 VAC); unsuitable for 800 V traction inverters requiring reinforced insulation. | Choose only for cost-sensitive non-traction applications where 4.4 mm creepage meets end-equipment standards. |
| ISO7761FDWR | TI device: 6-channel, 5000 VRMS, 100 Mbps max, SOIC-16 wide body, AEC-Q100 Grade 1 (–40 to +105 °C) | Lower temperature rating excludes under-hood use; higher 13 ns max propagation delay impacts timing-critical PWM paths. | Select when full Grade 0 operation is not required and 100 Mbps bandwidth suffices for communication-only isolation. |
Compared with SI8661BD-AS1 and ISO7761FDWR, SI8661BD-AS2R uniquely combines 8 mm creepage, Grade 0 temperature operation, and 150 Mbps speed - making it the only option qualified for high-voltage, high-speed, under-hood automotive power conversion.
Availability
SI8661BD-AS2R is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and charging station interfaces requiring stable component supply across automotive production lifecycles.
Supply support for SI8661BD-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 leader in high-performance analog semiconductors, specializing in RF, timing, and isolation technologies for demanding communications and automotive applications.
The Si866x family was engineered specifically for automotive and industrial high-voltage systems requiring reinforced isolation, AEC-Q100 compliance, and ultra-low power at multi-Mbps data rates - targeting next-generation EV power electronics.
FAQ
What is the isolation rating and certification status of SI8661BD-AS2R?
SI8661BD-AS2R provides 5 kVRMS reinforced isolation and is certified to UL 1577, VDE 0884-10, CSA 5A, and CQC GB4943.1 standards. It meets IEC 62368-1 and IEC 60601-1 requirements for medical and industrial equipment, and its VDE certification confirms suitability for reinforced insulation in 800 V battery systems. SI8661BD-AS2R is fully qualified for automotive use under AEC-Q100 Grade 0.
How does the fail-safe mode operate in SI8661BD-AS2R?
SI8661BD-AS2R is factory-configured for default-low fail-safe operation: when VDD1 is unpowered (0 V), OUT1 remains logic low as long as VDD2 is active. This prevents unintended activation of downstream gate drivers or relays during input-side brown-out. The behavior is defined in Table 3.1 of the datasheet and requires no external components or configuration pins.
What package type and creepage distance does SI8661BD-AS2R use?
SI8661BD-AS2R uses a 16-pin wide-body SOIC package designated "IS2", which eliminates tie bars to achieve 8 mm creepage while maintaining standard WB SOIC-16 land pattern dimensions. This design satisfies reinforced insulation requirements for 5 kVRMS working voltage in high-density automotive PCB layouts without requiring custom footprints.
Does SI8661BD-AS2R require external bypass capacitors or startup initialization?
SI8661BD-AS2R requires only two 0.1 µF ceramic bypass capacitors - one between VDD1 and GND1, another between VDD2 and GND2 - placed adjacent to the package. It needs no startup initialization, firmware, or configuration registers. Power-on reset is handled internally, with valid output data available within 40 µs after VDD1 and VDD2 exceed UVLO thresholds.
What is the maximum data rate and timing performance of SI8661BD-AS2R?
SI8661BD-AS2R supports DC to 150 Mbps data rates with typical propagation delay of 8 ns (max 13 ns), pulse width distortion of 0.2 ns (typ), and channel-to-channel skew of 0.4 ns (typ). These values are guaranteed across –40 to 125 °C and enable precise synchronization in high-frequency motor control loops and isolated ADC sampling interfaces.
SI8661BD-AS2R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- 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:
- 6
- Inputs - Side 1/Side 2:
- 5/1
- 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
SI8661BD-AS2R FAQ
1.How can I place an order for SI8661BD-AS2R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8661BD-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 SI8661BD-AS2R reliable?
The price and inventory of SI8661BD-AS2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8661BD-AS2R is usually 5 days.
3.What payment methods are accepted for SI8661BD-AS2R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8661BD-AS2R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8661BD-AS2R?
SI8661BD-AS2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8661BD-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 SI8661BD-AS2R?
For technical support, including SI8661BD-AS2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8661BD-AS2R requirements.
6.How does Aetrix verify that SI8661BD-AS2R is sourced from the original manufacturer or authorized distributors?
All SI8661BD-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 SI8661BD-AS2R meets industry standards.
7.What is the process for return or replacement of SI8661BD-AS2R?
All SI8661BD-AS2R units undergo pre-shipment inspection (PSI). If there is an issue with SI8661BD-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 SI8661BD-AS2R part is unused and in its original packaging.
Return procedure for SI8661BD-AS2R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8661BD-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
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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