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Skyworks Solutions Inc. SI86SS51BC-AS1R
- Part No.:
- SI86SS51BC-AS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI86SS51BC-AS1R.pdf
- Description:
- 3.75 KVRMS SPI COMPATIBLE ISOLAT
- Quantity:
- Payment:
- Shipping:
Inventory:1,307
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Product details
Overview
SI86SS51BC-AS1R from Skyworks Solutions is a 5-channel SPI digital isolator with reinforced isolation, designed for isolated microcontroller-to-peripheral communication in high-noise industrial and automotive systems. It supports up to 150 Mbps data rate, features 10 ns typical propagation delay, 6000 VRMS isolation rating, and operates across –40 to 125 °C with 2.25–5.5 V dual supply rails.
For engineers reviewing the SI86SS51BC-AS1R datasheet, SI86SS51BC-AS1R pinout, SI86SS51BC-AS1R application, or SI86SS51BC-AS1R equivalent, key selection criteria include its dedicated SPI channel mapping (MCSb/MCLK/MO/MI on Side A; SCSb/SCLK/SI/SO on Side B), isolated reset (RST/ISO_RST), fail-safe default output mode, and AEC-Q100 qualification for automotive use.
Technical Context
The SI86SS51BC-AS1R implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity. Its architecture integrates five isolated channels: four for full-duplex SPI signaling (MOSI/MISO/CLK/CS) and one dedicated bidirectional reset path (RST → ISO_RST).
It supports independent 2.25–5.5 V supplies on both sides, includes undervoltage lockout (UVLO) with 2.10–2.25 V thresholds per side, and provides fail-safe output behavior during power loss-configurable at ordering as default-high or default-low. The device meets IEC 60747-17 reinforced insulation requirements and achieves 100 kV/µs CMTI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed SPI interfaces without timing bottlenecks. |
| Propagation delay | 10 ns typical - enables tight timing budgets in real-time control loops. |
| Isolation rating | 6000 VRMS - meets reinforced insulation requirements for industrial and EV battery systems. |
| Supply voltage | 2.25–5.5 V per side - interoperable with 3.3 V and 5 V logic domains without level shifters. |
| Operating temperature | –40 to 125 °C - qualified for under-hood automotive and factory-floor industrial environments. |
| CMTI | ≥100 kV/µs - ensures reliable operation in high-di/dt motor drive and inverter applications. |
| AEC-Q100 grade | Grade 1 - validated for automotive powertrain and charging systems requiring long-term reliability. |
Pinout & Package
SI86SS51BC-AS1R is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance), supporting 6000 VRMS isolation with reinforced insulation per IEC 60747-17.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1, GND1 | Main side (Side A) supply | Power and ground for controller-side SPI interface (MCSb, MCLK, MO, MI, RST). |
| MCSb, MCLK, MO, MI, RST | Main side digital I/O | SPI chip select, clock, MOSI, MISO, and reset inputs/outputs - all referenced to VDD1/GND1. |
| VDD2, GND2 | Secondary side (Side B) supply | Independent power domain for isolated peripheral-side SPI signals and reset feedback. |
| SCSb, SCLK, SI, SO, ISO_RST | Secondary side digital I/O | Isolated SPI chip select, clock, MOSI, MISO, and reset output - referenced to VDD2/GND2. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation | Eliminates LED aging and temperature drift issues of optocouplers; no start-up initialization required. |
| Dedicated isolated reset channel | RST input on Side A drives ISO_RST output on Side B - enables synchronized fault recovery across isolation barrier. |
| Fail-safe output mode | Selectable at order time (default-high or default-low) - prevents undefined states during brownout or power sequencing. |
| Schmitt-trigger + CMOS inputs | Ensures clean signal capture in noisy environments (e.g., motor drives, inverters) without external hysteresis components. |
| Low-power sleep mode option | Not present in SI86SS51BC-AS1R - this variant lacks SMb pin; sleep mode is available only in Si86SMx family members. |
Applications
| Industrial Motor Control | Automotive Onboard Charger |
|---|---|
Use Scenario: Isolating SPI communication between MCU and isolated gate driver ICs in servo drives. IC Role / Device Role / Timing Role: SPI isolator providing galvanic separation for command and status data across high-voltage IGBT/SiC half-bridges. Use Value: Enables 150 Mbps SPI updates with 10 ns propagation delay, maintaining closed-loop timing integrity while meeting 6000 VRMS safety standards. | Use Scenario: Isolating MCU SPI interface from isolated ADCs monitoring battery cell voltages in OBC systems. IC Role / Device Role / Timing Role: SPI isolator transferring sampled cell data across isolation barrier with AEC-Q100 Grade 1 reliability. Use Value: Supports fast sampling rates via 150 Mbps link while maintaining fail-safe default outputs during transient supply dips in 12 V rail. |
| Medical Isolated ADC Interface | Renewable Energy Inverter Control |
Use Scenario: Connecting microcontroller to isolated sigma-delta ADCs in patient-connected diagnostic equipment. IC Role / Device Role / Timing Role: Reinforced-isolation SPI bridge ensuring compliance with IEC 60601-1 creepage/clearance and reinforced insulation requirements. Use Value: Delivers 6000 VRMS isolation and 100 kV/µs CMTI to prevent noise coupling into sensitive analog front-ends. | Use Scenario: Isolating SPI bus between DSP and isolated current/voltage sensors in solar string inverters. IC Role / Device Role / Timing Role: High-speed digital isolator enabling real-time sensor feedback in high-di/dt photovoltaic power conversion stages. Use Value: Maintains deterministic 10 ns propagation delay and failsafe output behavior during grid fault transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM3481CRWZ | 4-channel SPI isolator (no dedicated reset); 25 Mbps max data rate; 2500 VRMS isolation; SOIC-16WB package. | Lacks isolated reset channel; lower speed and isolation rating limit use in EV traction or high-reliability medical systems. | Choose ADUM3481CRWZ only when 25 Mbps suffices and 2500 VRMS meets system safety requirements. |
| ISO7741FQDWRQ1 | 4-channel digital isolator (non-SPI-optimized); 100 Mbps; 5000 VRMS; AEC-Q100 Grade 1; SOIC-16. | No native SPI pin mapping or dedicated reset; requires external logic for SPI protocol handling; lower isolation than SI86SS51BC-AS1R. | Select ISO7741FQDWRQ1 if system uses general-purpose isolation and can implement SPI framing in firmware. |
Compared with ADUM3481CRWZ and ISO7741FQDWRQ1, SI86SS51BC-AS1R uniquely integrates a fifth isolated channel for reset signaling, delivers 150 Mbps throughput, and achieves 6000 VRMS reinforced isolation-making it optimal for safety-critical, high-bandwidth SPI links in automotive and industrial power systems.
Availability
SI86SS51BC-AS1R is available at Aetrix Electronics and suitable for industrial motor control, automotive onboard chargers, medical isolated ADC interfaces, and renewable energy inverter control requiring stable component supply and long-term lifecycle support.
Supply support for SI86SS51BC-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 Si86S6xx/Sxx family-including SI86SS51BC-AS1R-is engineered for high-reliability, high-speed digital isolation in harsh electromagnetic environments, targeting industrial automation, automotive electrification, and medical electronics.
FAQ
What is the isolation rating and certification status of SI86SS51BC-AS1R?
SI86SS51BC-AS1R provides 6000 VRMS reinforced isolation per UL 1577 and is certified to IEC 60747-17. It also meets CSA 62368-1 and 60601-1, and CQC GB4943.1 requirements. These certifications validate its suitability for safety-critical applications including automotive battery management and medical diagnostics where reinforced insulation is mandated.
Does SI86SS51BC-AS1R support fail-safe output behavior during power loss?
Yes, SI86SS51BC-AS1R offers a selectable fail-safe mode (default-high or default-low) determined at ordering. When VDD1 or VDD2 drops below UVLO threshold, outputs assume the pre-configured state-preventing undefined logic levels in systems like motor controllers or medical devices during brownout conditions.
How is the reset functionality implemented in SI86SS51BC-AS1R?
SI86SS51BC-AS1R includes a dedicated isolated reset path: RST on Side A drives ISO_RST on Side B. This allows the controller to assert a hardware reset across the isolation barrier, enabling synchronized recovery of isolated peripherals such as ADCs or gate drivers without software intervention.
What are the supply voltage requirements for SI86SS51BC-AS1R?
SI86SS51BC-AS1R operates with independent 2.25–5.5 V supplies on both sides (VDD1 and VDD2). This dual-rail flexibility supports interfacing between 3.3 V MCUs and 5 V isolated peripherals, and eliminates need for external level-shifting circuitry in mixed-voltage SPI systems.
Is SI86SS51BC-AS1R compatible with standard SPI protocols without additional logic?
Yes, SI86SS51BC-AS1R is pin- and functionally optimized for standard SPI: MCSb/MCLK/MO/MI on Side A map directly to SCSb/SCLK/SI/SO on Side B. Its dedicated channel allocation and timing characteristics (10 ns propagation delay, 150 Mbps) ensure drop-in compatibility with existing SPI master-slave architectures.
SI86SS51BC-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:
- SPI
- Isolated Power:
- Yes
- Number of Channels:
- 5
- Inputs - Side 1/Side 2:
- 4/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 150kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 42ns, 42ns
- Pulse Width Distortion (Max):
- 2ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 2.25V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI86SS51BC-AS1R FAQ
1.How can I place an order for SI86SS51BC-AS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SS51BC-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 SI86SS51BC-AS1R reliable?
The price and inventory of SI86SS51BC-AS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SS51BC-AS1R is usually 5 days.
3.What payment methods are accepted for SI86SS51BC-AS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SS51BC-AS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SS51BC-AS1R?
SI86SS51BC-AS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SS51BC-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 SI86SS51BC-AS1R?
For technical support, including SI86SS51BC-AS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SS51BC-AS1R requirements.
6.How does Aetrix verify that SI86SS51BC-AS1R is sourced from the original manufacturer or authorized distributors?
All SI86SS51BC-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 SI86SS51BC-AS1R meets industry standards.
7.What is the process for return or replacement of SI86SS51BC-AS1R?
All SI86SS51BC-AS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI86SS51BC-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 SI86SS51BC-AS1R part is unused and in its original packaging.
Return procedure for SI86SS51BC-AS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SS51BC-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
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ISO7721FDR
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
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ISO7721DWVR
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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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