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Skyworks Solutions Inc. SI8661BD-B-IS2R
- Part No.:
- SI8661BD-B-IS2R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8661BD-B-IS2R.pdf
- Description:
- DGTL ISO 5000VRMS 6CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,596
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Product details
Overview
SI8661BD-B-IS2R from Skyworks is a six-channel digital isolator with 5-channel input / 1-channel output configuration, 5 kVRMS reinforced isolation rating, and wide-body SOIC-16 package. It operates from 2.5–5.5 V, supports up to 150 Mbps data rate, achieves <10 ns propagation delay, and features selectable fail-safe low-default output mode-designed for high-noise motor control and isolated power supply feedback loops.
For engineers reviewing the SI8661BD-B-IS2R datasheet, SI8661BD-B-IS2R pinout, SI8661BD-B-IS2R application, or SI8661BD-B-IS2R equivalent, key selection criteria include its 5 kVRMS working voltage, channel asymmetry (5I/1O), ultra-low power consumption at 100 Mbps (8.8 mA per channel @ 5 V), and AEC-Q100 qualification for automotive BMS and on-board chargers.
Technical Context
The SI8661BD-B-IS2R 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 on each side, with Schmitt-trigger inputs and undervoltage lockout (UVLO) thresholds of 2.24 V (rising) and 2.16 V (falling).
It delivers precise timing with 0.5 ns typical channel-to-channel skew and 2 ns propagation delay skew, while maintaining 50 kV/µs common-mode transient immunity (CMTI). The device's fail-safe mode is factory-set to default-low output during input-side power loss-critical for safety-critical gate driver enable/disable sequencing in traction inverters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation - meets IEC 60950-1, 62368-1, and 60601-1 for medical and industrial safety-critical systems. |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like isolated SPI, RS-485 transceiver control, and real-time ADC/DAC synchronization. |
| Propagation Delay | 8.0 ns typical - enables sub-10 ns timing-critical signal transfer in fast-switching SiC/GaN gate driver circuits. |
| Supply Voltage Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting. |
| Channel Configuration | 5 inputs / 1 output - optimized for asymmetric control paths such as PWM + fault reporting + status monitoring in motor drives. |
| Fail-Safe Default | Low output on VDD1 loss - ensures safe shutdown of power stage when controller supply fails, meeting functional safety requirements. |
| CMTI | 50 kV/µs minimum - prevents false triggering in high-dV/dt environments like battery disconnect switches and DC-link monitoring. |
Pinout & Package
SI8661BD-B-IS2R uses a RoHS-compliant 16-pin wide-body SOIC package (WB SOIC-16) with 8 mm creepage distance enabled by tie-bar elimination (IS2 designation), maintaining standard land pattern compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies logic and transmitter circuitry; UVLO threshold 2.24 V rising ensures clean startup before data transmission begins. |
| GND1 | Input-side ground reference | Reference for all input signals and VDD1; must be separated from GND2 by ≥8 mm creepage for 5 kVRMS compliance. |
| INA1–INA5 | Input channels (side A) | Schmitt-trigger inputs with 0.44 V hysteresis - reject >100 mV noise spikes in industrial bus environments. |
| VDD2 | Output-side power supply | Supplies receiver and output drivers; independent of VDD1 enables galvanic separation of control and power domains. |
| GND2 | Output-side ground reference | Reference for outputs and VDD2; forms isolation barrier with GND1; requires separate PCB plane routing. |
| OUTA1 | Output channel (side B) | 50 Ω nominal output impedance - matches controlled-impedance traces for clean 150 Mbps signal integrity without external termination. |
| NC | No-connect pins | Pins 10, 11, 12, 14, 15, 16 are internally unused - must remain unconnected and un-routed to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift issues of optocouplers; maintains stable timing over –40°C to +125°C life cycle. |
| Selectably fail-safe output | Factory-configured low-default state ensures gate driver disable on controller power loss-no external pull-down required. |
| Ultra-low power at 100 Mbps | 8.8 mA per channel @ 5 V - reduces thermal load in densely packed inverters and extends battery runtime in portable BMS. |
| High CMTI (50 kV/µs) | Prevents metastability in fast-switching SiC half-bridges where dV/dt exceeds 50 kV/µs during turn-off transitions. |
| AEC-Q100 Grade 1 qualified | Validated for automotive use from –40°C to +125°C ambient - suitable for on-board chargers and battery management systems. |
Applications
| Motor Control Systems | Isolated Power Supplies |
|---|---|
Use Scenario: Isolating PWM signals and fault feedback between MCU and three-phase inverter gate drivers in EV traction inverters. IC Role / Device Role / Timing Role: SI8661BD-B-IS2R transmits five PWM channels and one fault-reporting channel across isolation barrier with <10 ns skew. Use Value: Enables synchronous switching of high-side and low-side IGBTs/SiC FETs while ensuring safe shutdown on overcurrent detection. |
Use Scenario: Providing isolated feedback for secondary-side regulation in 1–3 kW AC/DC SMPS used in industrial PLCs. IC Role / Device Role / Timing Role: SI8661BD-B-IS2R carries voltage sense, current sense, and thermal warning signals from isolated secondary to primary controller. Use Value: Replaces optocoupler + TL431 combo with higher bandwidth, lower latency, and no gain drift over temperature or lifetime. |
| Battery Management Systems | Medical Isolated Data Acquisition |
Use Scenario: Isolating cell voltage monitoring and balancing commands between battery pack master controller and slave monitoring ICs. IC Role / Device Role / Timing Role: SI8661BD-B-IS2R routes five cell voltage readings and one balance-enable signal across 5 kVRMS barrier in modular packs. Use Value: Meets reinforced insulation requirements per IEC 60601-1 while supporting 100+ kHz sampling rates for accurate SOC estimation. |
Use Scenario: Isolating ECG/EEG analog front-end digitization paths from host processor in patient-connected diagnostic equipment. IC Role / Device Role / Timing Role: SI8661BD-B-IS2R transfers ADC conversion data, clock sync, and calibration commands across isolation boundary. Use Value: Provides 60-year lifetime reliability and 50 kV/µs CMTI to prevent noise-induced artifacts in µV-level biopotential measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6601ARIZ-RL7 | 6-channel, 5 kVRMS, but 50 Mbps max data rate and 25 ns propagation delay; integrated isolated DC-DC converter. | Lower speed limits use in high-bandwidth motor control; integrated power simplifies supply design in space-constrained modules. | Choose ADUM6601ARIZ-RL7 when isolated power is needed and data rate ≤50 Mbps suffices. |
| ISO6761FDWR | 6-channel, 5 kVRMS, 50 Mbps, 11 ns propagation delay; lower power (1.2 mA/ch @ 1 Mbps), but no AEC-Q100 qualification. | Lacks automotive qualification and failsafe configurability; suited for industrial automation but not automotive BMS. | Choose ISO6761FDWR for cost-sensitive industrial applications where AEC-Q100 and fail-safe mode are not required. |
Compared with ADUM6601ARIZ-RL7 and ISO6761FDWR, SI8661BD-B-IS2R uniquely combines 150 Mbps speed, <10 ns delay, AEC-Q100 Grade 1, and factory-set fail-safe low output-making it optimal for next-generation EV power electronics requiring both performance and functional safety.
Availability
SI8661BD-B-IS2R is available at Aetrix Electronics and suitable for motor control systems, isolated switch-mode power supplies, and battery management systems requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for SI8661BD-B-IS2R 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 engineered specifically for high-reliability, high-speed digital isolation in safety-critical systems-including EV traction inverters, medical imaging, and industrial servo drives-where legacy optocouplers fall short in speed, lifetime, and CMTI.
FAQ
What is the isolation voltage rating and safety certification status of SI8661BD-B-IS2R?
SI8661BD-B-IS2R is rated for 5 kVRMS reinforced isolation and certified to UL 1577, CSA Component Notice 5A, VDE 0884-10, IEC 60950-1, IEC 62368-1, and IEC 60601-1. These certifications validate its suitability for medical, industrial, and automotive end-equipment requiring double or reinforced insulation barriers.
Does SI8661BD-B-IS2R require external bypass capacitors, and if so, what value and placement is recommended?
Yes, SI8661BD-B-IS2R requires a 0.1 µF ceramic bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2. Each capacitor must be placed within 3 mm of its respective VDD pin and connected directly to the nearest ground via short, low-inductance traces to ensure stable operation and noise immunity.
How does the fail-safe mode operate in SI8661BD-B-IS2R, and can it be changed after manufacturing?
The fail-safe mode of SI8661BD-B-IS2R is factory-configured to default-low output when VDD1 is unpowered and cannot be altered in-circuit. This behavior is hardwired into the silicon and ensures predictable shutdown in safety-critical applications like motor gate drive enable lines-no external components or configuration registers are involved.
What is the maximum achievable data rate for SI8661BD-B-IS2R, and under what conditions is it guaranteed?
SI8661BD-B-IS2R supports up to 150 Mbps data rate across all six channels simultaneously, guaranteed over the full operating temperature range (–40°C to +125°C) and supply voltage range (2.5–5.5 V), with 15 pF capacitive load and proper PCB layout per Skyworks' land pattern guidelines.
Is SI8661BD-B-IS2R qualified for automotive applications, and what specific AEC-Q100 grade does it meet?
Yes, SI8661BD-B-IS2R is AEC-Q100 qualified to Grade 1 (–40°C to +125°C ambient), with full automotive process flow, zero-defect methodology, AIAG-compliant PPAP documentation, and IMDS/CAMDS material declarations-making it suitable for on-board chargers, battery management systems, and traction inverters in BEV/HEV platforms.
SI8661BD-B-IS2R 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:
- No
- Number of Channels:
- 6
- Inputs - Side 1/Side 2:
- 5/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 50kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 13ns, 13ns
- Pulse Width Distortion (Max):
- 4.5ns
- Rise / Fall Time (Typ):
- 4ns, 4ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8661BD-B-IS2R FAQ
1.How can I place an order for SI8661BD-B-IS2R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8661BD-B-IS2R 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-B-IS2R reliable?
The price and inventory of SI8661BD-B-IS2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8661BD-B-IS2R is usually 5 days.
3.What payment methods are accepted for SI8661BD-B-IS2R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8661BD-B-IS2R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8661BD-B-IS2R?
SI8661BD-B-IS2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8661BD-B-IS2R 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-B-IS2R?
For technical support, including SI8661BD-B-IS2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8661BD-B-IS2R requirements.
6.How does Aetrix verify that SI8661BD-B-IS2R is sourced from the original manufacturer or authorized distributors?
All SI8661BD-B-IS2R 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-B-IS2R meets industry standards.
7.What is the process for return or replacement of SI8661BD-B-IS2R?
All SI8661BD-B-IS2R units undergo pre-shipment inspection (PSI). If there is an issue with SI8661BD-B-IS2R, 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-B-IS2R part is unused and in its original packaging.
Return procedure for SI8661BD-B-IS2R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8661BD-B-IS2R 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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