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Skyworks Solutions Inc. SI8661BB-AUR
- Part No.:
- SI8661BB-AUR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8661BB-AUR.pdf
- Description:
- AUTOMOTIVE 2.5 KV 5 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:1,393
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Product details
Overview
SI8661BB-AUR from Skyworks is a six-channel, ultra-low-power 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 a RoHS-compliant QSOP-16 package. It delivers fail-safe low-default output behavior and operates across –40 to 125 °C for use in isolated motor control gate drivers and battery management system signal interfaces.
For engineers reviewing the SI8661BB-AUR datasheet, SI8661BB-AUR pinout, SI8661BB-AUR application, or SI8661BB-AUR equivalent, this page provides verified technical context, real-world timing performance, fail-safe configuration details, and automotive-grade AEC-Q100 qualified alternatives for high-reliability isolated communication design.
Technical Context
The SI8661BB-AUR implements RF-based on/off keying modulation across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical components. Its dual-supply architecture (VDD1/VDD2) supports asymmetric voltage operation from 2.5–5.5 V per side and includes independent undervoltage lockout (UVLO) monitors on both sides.
Schmitt-trigger inputs provide 0.44 V typical hysteresis for high noise rejection, while the selectable fail-safe mode fixes output state during input-side power loss-here configured as default-low per ordering option "BB". Channel-to-channel skew is ≤2.5 ns, and common-mode transient immunity reaches 50 kV/µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels / Direction | 6 total: 5 unidirectional inputs on VDD1 side, 1 unidirectional output on VDD2 side |
| Max Data Rate | 150 Mbps - enables high-speed SPI, RS-485, or CAN FD isolation without bottlenecks |
| Propagation Delay | 8.0 ns typical - ensures tight timing alignment in real-time motor control loops |
| Isolation Rating | 2.5 kVRMS - certified to UL 1577, VDE 0884-10, and IEC 62368-1 reinforced insulation standards |
| Supply Voltage Range | 2.5–5.5 V per side - supports mixed-voltage systems (e.g., 3.3 V MCU + 5 V actuator interface) |
| Fail-Safe Output | Default-low - guarantees safe deactivation of downstream power stages during VDD1 brownout |
| AEC-Q100 Grade | Qualified to Grade 0 (–40 to +125 °C) - validated for automotive traction inverter and OBC applications |
Pinout & Package
QSOP-16 narrow-body surface-mount package (5.3 mm × 10.2 mm, 1.0 mm height), RoHS-compliant, JEDEC-standard reflow profile (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for 5 input channels and internal transmitter; requires 0.1 µF bypass capacitor |
| GND1 | Input-side ground | Reference return for VDD1 and all input signals; must be separated from GND2 by isolation barrier |
| IN1–IN5 | Digital inputs | 5 Schmitt-triggered logic inputs referenced to VDD1/GND1; accept 2.0–5.5 V logic levels |
| VDD2 | Output-side supply | Power for 1 output driver and internal receiver; independent of VDD1 |
| GND2 | Output-side ground | Reference return for VDD2 and OUT1; galvanically isolated from GND1 |
| OUT1 | Digital output | Single CMOS output referenced to VDD2/GND2; 50 Ω nominal impedance, drives 15 pF load |
| NC | No-connect | Pins 10, 11, 12, 14, 15, 16 are unused and must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation | Eliminates LED aging and temperature drift issues inherent in optocouplers; no startup initialization required |
| Ultra-low power at 100 Mbps | 8.8 mA (VDD1) + 23 mA (VDD2) typical @ 5 V - reduces thermal load in compact BMS modules |
| High CMTI | 50 kV/µs common-mode transient immunity - maintains signal integrity in noisy inverter switching environments |
| Precision timing | 0.5 ns channel-channel skew and 2 ns propagation delay skew - critical for synchronized multi-phase gate driving |
| Automotive qualification | AEC-Q100 Grade 0, AIAG-compliant PPAP, IMDS/CAMDS support - meets OEM production requirements |
Applications
| Motor Control Interface | Battery Management System |
|---|---|
Use Scenario: Isolating PWM signals from MCU to IGBT/SiC gate drivers in industrial servo drives and EV traction inverters. IC Role / Device Role / Timing Role: Unidirectional signal isolator delivering 5 control inputs (e.g., EN, DIR, FAULT) and 1 status feedback (e.g., READY) across isolation barrier. Use Value: Sub-10 ns propagation delay and 0.5 ns channel skew ensure precise phase alignment across multi-leg inverter bridges. | Use Scenario: Transmitting cell voltage monitoring data and balancing commands between isolated high-voltage battery stack and low-voltage MCU controller. IC Role / Device Role / Timing Role: Isolating 5 analog front-end ADC status lines and 1 dedicated fault-alert output in ASIL-B compliant BMS architectures. Use Value: Default-low fail-safe behavior forces safe shutdown of balancing FETs during MCU power interruption. |
| On-Board Charger | Industrial PLC I/O Module |
Use Scenario: Isolating digital control signals between AC/DC PFC stage and DC/DC LLC stage in automotive OBC units. IC Role / Device Role / Timing Role: Transmitting 5 command signals (e.g., soft-start, frequency trim, enable) and receiving 1 status flag (e.g., overtemp alert) across 2.5 kVRMS barrier. Use Value: AEC-Q100 qualification and 125 °C operation guarantee reliability under under-hood thermal stress. | Use Scenario: Providing isolated digital input conditioning for 24 V DC field sensors and isolated output driving for solenoid/relay control in factory automation cabinets. IC Role / Device Role / Timing Role: Converting 5 industrial sensor inputs into clean logic levels and delivering 1 consolidated alarm output to safety PLC. Use Value: Schmitt-trigger inputs reject EMI from nearby VFDs; 50 kV/µs CMTI prevents false triggering in electrically noisy environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8661BB-AU | Same pinout, same electrical specs, but supplied in tube (not tape-and-reel); lacks "R" suffix indicating reel packaging | No functional difference; suitable for prototyping or low-volume manual assembly where reel handling is unnecessary | Select SI8661BB-AU only when tape-and-reel is not required for SMT line compatibility |
| ADUM161N0BRZ-RL | 6-channel, 150 Mbps, default-low, but uses iCoupler magnetic isolation; higher 12.5 mA/VDD typical current at 100 Mbps vs. SI8661BB-AUR's 8.8/23 mA split | Not AEC-Q100 qualified; limited to industrial temp range (–40 to 105 °C); lacks automotive documentation support (PPAP/IMDS) | Choose ADUM161N0BRZ-RL only for cost-sensitive non-automotive designs where magnetic isolation suffices |
Compared with SI8661BB-AUR, SI8661BB-AU offers identical performance in tube packaging for evaluation, while ADUM161N0BRZ-RL provides magnetic-isolation alternative with lower integration maturity for automotive systems and higher power consumption at high data rates.
Availability
SI8661BB-AUR is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, and industrial motor control applications requiring stable component supply, automotive-grade traceability, and long-term lifecycle continuity.
Supply support for SI8661BB-AUR 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 Si866x family was designed specifically for high-reliability, high-speed digital isolation in automotive and industrial systems-emphasizing low power, precise timing, and safety-certified reinforced insulation.
FAQ
What is the isolation rating and safety certification status of SI8661BB-AUR?
The SI8661BB-AUR is rated for 2.5 kVRMS isolation and certified to UL 1577 (1 minute), VDE 0884-10, CSA Component Notice 5A, and IEC 62368-1 reinforced insulation standards. These certifications validate its suitability for functional and basic insulation in automotive and industrial end-equipment requiring safety compliance.
Does SI8661BB-AUR require external startup initialization or configuration?
No, SI8661BB-AUR requires no startup initialization or configuration. Its RF-based isolation architecture begins transmitting valid data within 40 µs of VDD application, with outputs transitioning to the fail-safe default (low) state until input signals stabilize-eliminating firmware dependencies and boot-time uncertainty.
How does the fail-safe mode function in SI8661BB-AUR during input-side power loss?
In SI8661BB-AUR, the "BB" ordering code specifies default-low fail-safe behavior: when VDD1 is unpowered (0 V) but VDD2 remains active, OUT1 is actively driven low. This ensures downstream circuits-such as gate drivers or safety relays-enter a known safe state without external pull-downs or supervision logic.
What is the maximum operating temperature and AEC-Q100 grade for SI8661BB-AUR?
SI8661BB-AUR is qualified to AEC-Q100 Grade 0, supporting continuous operation from –40 to +125 °C ambient temperature. This qualification covers full automotive use cases including traction inverters and on-board chargers, backed by AIAG-compliant PPAP documentation and IMDS/CAMDS material declarations.
Can SI8661BB-AUR operate with different supply voltages on VDD1 and VDD2 sides?
Yes, SI8661BB-AUR supports independent 2.5–5.5 V supplies on VDD1 and VDD2. For example, it can interface a 3.3 V microcontroller (VDD1 = 3.3 V) to a 5 V gate driver stage (VDD2 = 5 V), maintaining full 150 Mbps data rate and timing specifications across the voltage mismatch without level-shifting components.
SI8661BB-AUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (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-QSOP
SI8661BB-AUR FAQ
1.How can I place an order for SI8661BB-AUR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8661BB-AUR 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-AUR reliable?
The price and inventory of SI8661BB-AUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8661BB-AUR is usually 5 days.
3.What payment methods are accepted for SI8661BB-AUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8661BB-AUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8661BB-AUR?
SI8661BB-AUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8661BB-AUR 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-AUR?
For technical support, including SI8661BB-AUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8661BB-AUR requirements.
6.How does Aetrix verify that SI8661BB-AUR is sourced from the original manufacturer or authorized distributors?
All SI8661BB-AUR 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-AUR meets industry standards.
7.What is the process for return or replacement of SI8661BB-AUR?
All SI8661BB-AUR units undergo pre-shipment inspection (PSI). If there is an issue with SI8661BB-AUR, 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-AUR part is unused and in its original packaging.
Return procedure for SI8661BB-AUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8661BB-AUR 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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