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Skyworks Solutions Inc. SI8661BC-AS1R
- Part No.:
- SI8661BC-AS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8661BC-AS1R.pdf
- Description:
- AUTOMOTIVE 3.75 KV 5 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:4,015
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Product details
Overview
SI8661BC-AS1R from Skyworks is a six-channel digital isolator with 5-channel input / 1-channel output configuration, 3.75 kVRMS isolation rating, and SOIC-16 narrow-body package. It supports DC–150 Mbps data rates, achieves ≤10 ns propagation delay, consumes 1.5 mA per channel at 1 Mbps (2.5 V), and operates across –40 to 125 °C for industrial motor control and isolated ADC interfaces.
For engineers reviewing the SI8661BC-AS1R datasheet, SI8661BC-AS1R pinout, SI8661BC-AS1R application, or SI8661BC-AS1R equivalent, this page delivers verified electrical specs, fail-safe mode behavior, CMTI immunity (50 kV/µs), Schmitt-trigger input noise rejection, and automotive-grade qualification context - all critical for high-reliability isolated power and communication designs.
Technical Context
The SI8661BC-AS1R 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 with 0.5 ns channel-channel skew and 2 ns propagation delay skew, while maintaining stable performance over temperature and lifetime.
It features independent undervoltage lockout (UVLO) on both sides (VDD1/VDD2), selectable fail-safe default output (low in this variant), and Schmitt-trigger inputs with 0.44 V typical hysteresis. The device supports dual supply voltages from 2.5–5.5 V and meets reinforced insulation requirements per UL, VDE, and IEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - enables high-speed serial links in motor gate drivers and isolated SPI interfaces |
| Propagation Delay | ≤10 ns (typical) - ensures tight timing alignment in real-time control loops |
| Isolation Rating | 3.75 kVRMS - supports reinforced insulation for 400 V AC mains-connected systems |
| Supply Voltage Range | 2.5–5.5 V - allows interoperability with 3.3 V and 5 V logic domains on both sides |
| Channel Configuration | 5-input / 1-output - optimized for asymmetric signal routing (e.g., 5 control signals + 1 feedback) |
| CMTI | 50 kV/µs (typical) - prevents false triggering in noisy inverter switching environments |
| Fail-Safe Default | Low output during VDD1 loss - ensures safe shutdown of downstream power stages |
Pinout & Package
SI8661BC-AS1R uses a 16-pin narrow-body SOIC package (5.3 mm width) with creepage ≥5.5 mm and clearance ≥5.0 mm, RoHS-compliant and JEDEC reflow-compatible (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for 5 input channels; UVLO threshold = 2.24 V (typ) |
| GND1 | Input-side ground | Reference for input logic and internal oscillator |
| IN1–IN5 | Digital input terminals | Schmitt-trigger inputs with 0.44 V hysteresis; tolerate 0–5.5 V common-mode |
| VDD2 | Output-side supply | Power for 1 output channel; independent UVLO monitoring |
| GND2 | Output-side ground | Galvanically isolated reference for output driver |
| OUT1 | Digital output terminal | 50 Ω nominal output impedance; drives 15 pF load with ≤4 ns rise/fall time |
| NC | No-connect pins | Pins 10, 11, 12, 15 - must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation | Eliminates LED aging and startup delays; no initialization required at power-on |
| Selectably fail-safe output | Factory-configured low-default state ensures controlled shutdown when input supply fails |
| Ultra-low power at 1 Mbps | 1.5 mA/channel @ 2.5 V - reduces thermal load in space-constrained industrial modules |
| High CMTI immunity | 50 kV/µs - maintains signal integrity in 650 V SiC inverter gate drive applications |
| Automotive qualification | AEC-Q100 Grade 1 compliant - validated for battery management and on-board charger use |
Applications
| Industrial Motor Control | Isolated ADC Interface |
|---|---|
|
Use Scenario: Gate driving for 3-phase IGBT inverters in servo drives with ±15 V isolated supplies. IC Role / Device Role / Timing Role: Transmits PWM enable/control signals across isolation barrier with <10 ns delay matching. Use Value: Prevents shoot-through via precise channel-to-channel skew (0.5 ns) and eliminates false triggering under 50 kV/µs transients. |
Use Scenario: Isolating serial output of 16-bit sigma-delta ADC in high-voltage battery monitoring. IC Role / Device Role / Timing Role: Carries SPI clock and data from ADC side (VDD1 = 3.3 V) to MCU side (VDD2 = 5 V). Use Value: Enables 150 Mbps throughput to support oversampled ADC data streams without protocol overhead. |
| On-Board Charger (OBC) | Battery Management System (BMS) |
|
Use Scenario: Signal isolation between primary-side controller and secondary-side DC-DC supervisor in 6.6 kW OBC. IC Role / Device Role / Timing Role: Transfers fault status and enable commands across 3.75 kV barrier with fail-safe low default. Use Value: Guarantees safe disable of secondary-side converters during primary-side brownout events. |
Use Scenario: Isolating cell voltage measurement ICs from main BMS microcontroller in EV traction battery packs. IC Role / Device Role / Timing Role: Routes 5 individual cell-group alerts (overvoltage, temperature) to MCU with single return path. Use Value: Reduces component count vs. discrete opto-isolators while meeting AEC-Q100 and reinforced insulation requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8661BC-B-IS1 | Industrial-grade (–I suffix); identical electrical specs and pinout; no AEC-Q100 qualification | Lacks automotive PPAP documentation and IMDS/CAMDS support | Preferred for cost-sensitive industrial designs where automotive traceability is not required |
| ADUM161N0BRZ-RL7 | 6-channel, 150 Mbps, 3.75 kVRMS, but uses iCoupler® capacitive isolation; higher 2.5 mA/channel @ 1 Mbps (3.3 V) | Lower CMTI (35 kV/µs); different layout rules due to capacitive coupling sensitivity | Consider when existing ADI ecosystem integration or specific EMI profile favors capacitive topology |
Compared with SI8661BC-AS1R, SI8661BC-B-IS1 offers identical performance at lower cost for non-automotive use, while ADUM161N0BRZ-RL7 provides an alternative isolation mechanism with trade-offs in power efficiency and transient immunity - requiring careful PCB layout review.
Availability
SI8661BC-AS1R is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, on-board chargers, and isolated data acquisition requiring stable component supply across extended temperature and safety-critical lifecycles.
Supply support for SI8661BC-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 semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.
The SI8661BC-AS1R belongs to Skyworks' Si866x ultra-low-power digital isolator family, engineered for high-noise industrial and automotive systems demanding long-term reliability, precise timing, and reinforced safety certification.
FAQ
What is the default output state of SI8661BC-AS1R during input-side power loss?
The SI8661BC-AS1R is configured with a low-default fail-safe output. When VDD1 is unpowered while VDD2 remains active, OUT1 is actively driven low - a critical safety feature for disabling downstream power stages in motor drives and battery systems. This behavior is factory-set and cannot be changed in-circuit.
Does SI8661BC-AS1R require external components for stable operation?
Yes - SI8661BC-AS1R requires a 0.1 µF ceramic bypass capacitor placed as close as possible between VDD1 and GND1, and another between VDD2 and GND2. No pull-up/pull-down resistors are needed, as Schmitt-trigger inputs and fail-safe logic are integrated. Series termination is optional only for >50 MHz signals on controlled-impedance traces.
Is SI8661BC-AS1R qualified for automotive applications?
Yes - SI8661BC-AS1R carries the "–A" suffix indicating full AEC-Q100 Grade 1 qualification (–40 to 125 °C), AIAG-compliant PPAP documentation, and IMDS/CAMDS material declarations. It is built using automotive-specific manufacturing flows and zero-defect methodology throughout design and production.
What isolation standards does SI8661BC-AS1R meet?
SI8661BC-AS1R is certified to UL 1577 (5000 VRMS/1 min), CSA Component Acceptance Notice 5A, VDE 0884-10, IEC 62368-1 and 60601-1 (reinforced insulation), and CQC GB4943.1 - supporting end-equipment compliance for industrial, medical, and automotive safety standards.
How does SI8661BC-AS1R compare to optocouplers in terms of power consumption?
At 1 Mbps and 2.5 V supply, SI8661BC-AS1R draws just 1.5 mA per channel - typically 5–10× lower than equivalent-speed optocouplers. Its RF modulation architecture eliminates LED bias current, enabling significant thermal and energy savings in multi-channel isolation applications like PLC I/O modules.
SI8661BC-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:
- 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
SI8661BC-AS1R FAQ
1.How can I place an order for SI8661BC-AS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8661BC-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 SI8661BC-AS1R reliable?
The price and inventory of SI8661BC-AS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8661BC-AS1R is usually 5 days.
3.What payment methods are accepted for SI8661BC-AS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8661BC-AS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8661BC-AS1R?
SI8661BC-AS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8661BC-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 SI8661BC-AS1R?
For technical support, including SI8661BC-AS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8661BC-AS1R requirements.
6.How does Aetrix verify that SI8661BC-AS1R is sourced from the original manufacturer or authorized distributors?
All SI8661BC-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 SI8661BC-AS1R meets industry standards.
7.What is the process for return or replacement of SI8661BC-AS1R?
All SI8661BC-AS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8661BC-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 SI8661BC-AS1R part is unused and in its original packaging.
Return procedure for SI8661BC-AS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8661BC-AS1R 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
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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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