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Skyworks Solutions Inc. SI8661BB-AS1R
- Part No.:
- SI8661BB-AS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8661BB-AS1R.pdf
- Description:
- AUTOMOTIVE 2.5 KV 5 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:3,385
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Product details
Overview
SI8661BB-AS1R from Skyworks is a six-channel automotive-grade digital isolator with 5 input channels on VDD1 side and 1 output channel on VDD2 side, supporting up to 150 Mbps data rate, <10 ns propagation delay, and 2.5 kVRMS isolation rating in narrow-body SOIC-16 package. It operates across –40 to 125 °C and features Schmitt-trigger inputs, selectable fail-safe low-default output, and ultra-low power consumption (1.5 mA/channel at 1 Mbps, 2.5 V).
For engineers reviewing the SI8661BB-AS1R datasheet, SI8661BB-AS1R pinout, SI8661BB-AS1R application, or SI8661BB-AS1R equivalent, this page delivers verified specifications, automotive-qualified timing performance, fail-safe behavior under undervoltage, CMTI immunity of 50 kV/µs, and precise channel-to-channel skew control for high-reliability isolated communication in battery management and traction inverter systems.
Technical Context
The SI8661BB-AS1R implements RF-based on-off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its dual-supply architecture (VDD1/VDD2) supports independent 2.5–5.5 V operation per side with separate UVLO monitors and fail-safe logic state retention during input-side power loss.
Each channel integrates Schmitt-trigger inputs (VT+ = 1.67 V typ, VT– = 1.23 V typ), 50 Ω nominal output impedance, and precise timing: 0.5 ns typical channel-channel skew, 2 ns propagation delay skew, and 5 ns minimum pulse width - all stable over temperature and lifetime.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - enables high-speed CAN FD, SPI, or isolated ADC interface without protocol bottlenecks |
| Propagation Delay | 8.0 ns typical - ensures sub-10 ns timing margin for real-time motor control loop closure |
| Channel-Channel Skew | 0.5 ns typical - maintains phase alignment across multi-channel isolated gate drivers or encoder interfaces |
| Common-Mode Transient Immunity | 50 kV/µs - prevents data corruption in high-dV/dt environments like IGBT switching nodes |
| Supply Voltage Range | 2.5–5.5 V per side - supports direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends |
| Isolation Rating | 2.5 kVRMS - certified to UL, CSA, VDE, and CQC standards for reinforced insulation in industrial and automotive systems |
| Operating Temperature | –40 to 125 °C - qualified per AEC-Q100 Grade 1 for under-hood and battery-pack applications |
Pinout & Package
Narrow-body SOIC-16 (NB SOIC-16) package with 8.3 mm creepage/clearance, RoHS-compliant, peak reflow 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5 | VDD1-side Inputs | Five isolated digital inputs referenced to VDD1/GND1; Schmitt-triggered for >0.44 V hysteresis against EMI |
| 6 | VDD1 | Input-side supply (2.5–5.5 V); requires 0.1 µF bypass capacitor to GND1 |
| 7, 8, 9, 10, 11 | VDD2-side Outputs | One output channel (Pin 7) and four NC pins - output drives 50 Ω trace with 2.5–4.0 ns rise/fall time |
| 12 | GND1 | Input-side ground reference; must be separated from GND2 by ≥8 mm for reinforced insulation compliance |
| 13, 14, 15, 16 | VDD2, GND2, NC, NC | VDD2 (Pin 13) powers output side; GND2 (Pin 14) is isolated return; Pins 15–16 are no-connect |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 qualified with AIAG-compliant PPAP, IMDS/CAMDS support, and zero-defect manufacturing flow |
| Selectable fail-safe mode | Low-default output state ensures safe shutdown of downstream circuits during VDD1 loss - no external pull-downs needed |
| Ultra-low power at 1 Mbps | 1.5 mA per channel at 2.5 V - reduces thermal load in sealed battery enclosures and extends system standby time |
| High CMTI immunity | 50 kV/µs common-mode transient rejection - sustains data integrity near 1000 V DC bus switching edges |
| No start-up initialization | Valid output within 40 µs of VDD application - eliminates boot-time handshake delays in safety-critical BMS |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating cell voltage monitoring ADC signals and pack contactor control commands between high-voltage battery stack and MCU. IC Role / Device Role / Timing Role: SI8661BB-AS1R provides five isolated sensor data paths and one fault-clear command path with <10 ns latency and fail-safe low output during MCU reset. Use Value: Enables ASIL-B compliant diagnostics via deterministic timing, 60-year isolation life at 1000 V working voltage, and AEC-Q100 validation for EV battery longevity. |
Use Scenario: Transmitting PWM gate drive enable/disable signals from inverter MCU to isolated gate driver ICs in 800 V SiC inverter modules. IC Role / Device Role / Timing Role: SI8661BB-AS1R delivers one isolated control channel with 50 kV/µs CMTI immunity and 0.5 ns channel skew to synchronize dual-leg switching. Use Value: Prevents shoot-through failures during fast dV/dt transients; narrow-body SOIC-16 fits constrained gate driver PCB layouts while meeting reinforced insulation requirements. |
| On-Board Charger (OBC) | Charging Station Communication |
|
Use Scenario: Isolating digital control signals between primary-side PFC controller and secondary-side LLC controller in bidirectional OBC topologies. IC Role / Device Role / Timing Role: SI8661BB-AS1R carries five status/feedback signals (e.g., overvoltage, temperature, fault flags) and one isolated enable signal across 2.5 kVRMS barrier. Use Value: Supports 150 Mbps real-time telemetry for adaptive charging algorithms while maintaining UL/VDE certification for medical-grade isolation in EVSE systems. |
Use Scenario: Isolating CAN FD communication lines between charging station controller and vehicle battery management unit during high-power DC charging. IC Role / Device Role / Timing Role: SI8661BB-AS1R isolates CAN TX/RX differential pairs using two channels (one direction), preserving signal integrity at 2 Mbps with sub-10 ns propagation delay. Use Value: Ensures galvanic separation for functional safety (ISO 15118), avoids ground-loop interference, and meets CISPR 25 Class 5 EMC requirements for EV infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8661BB-IS1R | Industrial-grade (–I suffix), same pinout, 2.5 kVRMS, but not AEC-Q100 qualified or PPAP-supported | Lacks automotive process controls, IMDS/CAMDS, and AIAG documentation - unsuitable for OEM production programs | Select SI8661BB-AS1R for automotive BMS/inverter designs requiring full automotive traceability and zero-defect flow. |
| ADUM6601ARWZ | Analog Devices' 6-channel isolator with integrated 500 mW isolated DC-DC; higher power, larger QSOP-20 package, 100 Mbps max | Provides isolated power but lower data rate and no fail-safe low-default option - less optimal for high-speed BMS telemetry | Choose SI8661BB-AS1R when board space, 150 Mbps throughput, and automotive fail-safe behavior are prioritized over integrated power. |
Compared with SI8661BB-IS1R, SI8661BB-AS1R adds AEC-Q100 qualification and PPAP support for automotive release; compared with ADUM6601ARWZ, it offers higher speed, smaller footprint, and deterministic fail-safe state - critical for ISO 26262-compliant battery control loops.
Availability
SI8661BB-AS1R is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and charging station controllers requiring stable component supply with automotive-grade reliability and long-term lifecycle support.
Supply support for SI8661BB-AS1R 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 wireless, automotive, and industrial markets.
The Si866x family was designed specifically for high-reliability isolated communication in electric vehicle powertrain systems, delivering AEC-Q100-qualified timing precision, 60-year isolation life, and reinforced insulation for 800 V battery architectures.
FAQ
What is the default output state of SI8661BB-AS1R during input-side power loss?
The SI8661BB-AS1R has a low-default fail-safe output state, meaning Pin 7 outputs logic low when VDD1 is unpowered but VDD2 remains active. This behavior is fixed by ordering code "BB" and ensures safe deactivation of downstream drivers or contactors without external circuitry. The SI8661BB-AS1R maintains this state until VDD1 recovers above UVLO+ (2.24 V typ).
Does SI8661BB-AS1R require external bypass capacitors?
Yes, the SI8661BB-AS1R requires a 0.1 µF ceramic bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2, placed as close as possible to the respective pins. These capacitors stabilize supply rails during high-speed switching and are mandatory for achieving specified 150 Mbps operation and 50 kV/µs CMTI performance.
How does SI8661BB-AS1R differ from SI8660BB-AS1R in channel configuration?
The SI8661BB-AS1R provides five input channels on the VDD1 side and one output channel on the VDD2 side (5:1 asymmetry), whereas SI8660BB-AS1R offers six input channels and zero outputs (6:0). This makes SI8661BB-AS1R ideal for telemetry-heavy applications like BMS cell monitoring, where multiple sensors feed one controller, unlike SI8660BB-AS1R used for unidirectional control signal fan-out.
Is SI8661BB-AS1R compatible with 2.5 V logic interfaces?
Yes, the SI8661BB-AS1R supports 2.5 V operation on both VDD1 and VDD2 sides, with verified performance including 1.5 mA/channel supply current at 1 Mbps and valid logic thresholds (VIH = 2.0 V min, VIL = 0.8 V max). Its Schmitt-trigger inputs ensure robust noise immunity even at reduced supply voltages, making it suitable for low-power 2.5 V microcontroller interfaces.
What safety certifications apply to SI8661BB-AS1R?
The SI8661BB-AS1R holds UL 1577 (5000 VRMS/1 min), CSA Component Acceptance Notice 5A, VDE 0884-10, and CQC GB4943.1 certifications for 2.5 kVRMS reinforced insulation. These approvals cover compliance with IEC 62368-1 and IEC 60601-1, enabling use in medical-grade and automotive EV systems requiring certified galvanic isolation barriers.
SI8661BB-AS1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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:
- 2500Vrms
- 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
SI8661BB-AS1R FAQ
1.How can I place an order for SI8661BB-AS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8661BB-AS1R 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 SI8661BB-AS1R reliable?
The price and inventory of SI8661BB-AS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8661BB-AS1R is usually 5 days.
3.What payment methods are accepted for SI8661BB-AS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8661BB-AS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8661BB-AS1R?
SI8661BB-AS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8661BB-AS1R 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 SI8661BB-AS1R?
For technical support, including SI8661BB-AS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8661BB-AS1R requirements.
6.How does Aetrix verify that SI8661BB-AS1R is sourced from the original manufacturer or authorized distributors?
All SI8661BB-AS1R 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 SI8661BB-AS1R meets industry standards.
7.What is the process for return or replacement of SI8661BB-AS1R?
All SI8661BB-AS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8661BB-AS1R, 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 SI8661BB-AS1R part is unused and in its original packaging.
Return procedure for SI8661BB-AS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8661BB-AS1R Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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