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Skyworks Solutions Inc. SI86SS41EC-AS1
- Part No.:
- SI86SS41EC-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI86SS41EC-AS1.pdf
- Description:
- 3.75 KVRMS SPI COMPATIBLE ISOLAT
- Quantity:
- Payment:
- Shipping:
Inventory:1,839
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Product details
Overview
SI86SS41EC-AS1 from Skyworks Solutions is a 4-channel SPI digital isolator with reinforced isolation, designed for isolated communication between microcontroller and peripheral devices across high-voltage barriers. It supports up to 150 Mbps data rate, features 10 ns typical propagation delay, 6000 VRMS isolation rating, and operates from 2.25–5.5 V on both sides. It is used in isolated ADC/DAC interfaces and motor control systems requiring robust noise immunity.
For engineers reviewing the SI86SS41EC-AS1 datasheet, SI86SS41EC-AS1 pinout, SI86SS41EC-AS1 application, or SI86SS41EC-AS1 equivalent, key selection criteria include its dedicated SPI channel mapping (MCSb/MCLK/MO/MI/SI/SO/SCLK/SCSb), fail-safe default-low output option, AEC-Q100 qualification, and SOIC-16 wide-body package enabling 6.0 kVRMS withstand capability.
Technical Context
The SI86SS41EC-AS1 implements RF-based on-off keying modulation across a semiconductor isolation barrier, eliminating startup initialization and providing inherent immunity to magnetic fields and EMI. Its architecture includes separate VDD1/GND1 and VDD2/GND2 domains, Schmitt-trigger + CMOS threshold inputs, and tri-state outputs controlled by enable logic.
It delivers precise timing with 10 ns typical propagation delay and 3.5 ns pulse width distortion, while supporting fail-safe operation where outputs default low during unpowered conditions on the input side. Transient immunity exceeds 100 kV/µs, and it meets IEC 60747-17 reinforced insulation requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | Up to 150 Mbps - enables high-speed SPI communication without protocol bottlenecks. |
| Propagation delay | 10 ns typical - ensures tight timing alignment in real-time control loops. |
| Isolation rating | 6000 VRMS - supports reinforced insulation per UL 1577 and IEC 60747-17 for industrial safety compliance. |
| Supply voltage | 2.25–5.5 V per side - allows interoperability with 3.3 V and 5 V logic domains without level shifters. |
| Operating temperature | –40 to 125 °C - qualified for under-hood automotive and industrial ambient environments. |
| Transient immunity | ≥100 kV/µs - suppresses fast common-mode transients in motor drives and power inverters. |
| AEC-Q100 grade | Qualified - meets automotive reliability standards for onboard chargers and battery management systems. |
Pinout & Package
SI86SS41EC-AS1 is housed in a WB SOIC-16 (wide-body SOIC-16) package with creepage/clearance optimized for 6.0 kVRMS isolation. The package meets RoHS requirements and supports automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Main side supply | Provides power to Side A (controller side); requires 0.1 µF + 10 µF bypass capacitors. |
| GND1 | Main side ground | Reference for Side A signals; must be separated from GND2 by isolation barrier. |
| MCSb | Main side chip select | Active-low SPI chip select input controlling MO/MCLK/MO-to-MI data flow. |
| MCLK | Main side clock | Drives SPI clock signal from controller to isolator; determines maximum achievable data rate. |
| MO | Main side MOSI | Serial data input from controller to peripheral side; isolated via RF modulation path. |
| MI | Main side MISO | Serial data output from peripheral side back to controller; passes through isolation barrier. |
| NC | No connect | Pin 7 is internally unused; must remain unconnected per datasheet. |
| GND2 | Secondary side ground | Reference for Side B (peripheral side); galvanically isolated from GND1. |
| SI | Secondary side MOSI | Isolated serial data output to peripheral device (e.g., ADC); driven from MI path. |
| SCLK | Secondary side clock | Isolated SPI clock output to peripheral; synchronized with MCLK but delayed by propagation time. |
| SCSb | Secondary side chip select | Isolated active-low chip select output; enables peripheral only when MCSb is asserted. |
| VDD2 | Secondary side supply | Power for Side B circuitry; independent of VDD1, enabling dual-domain operation. |
| SO | Secondary side MISO | Input from peripheral device (e.g., ADC output); isolated and routed to MI pin. |
| NC | No connect | Pin 15 is internally unused; must remain unconnected. |
| NC | No connect | Pin 16 is internally unused; must remain unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| No start-up initialization | Enables immediate data transmission at power-on without firmware handshake or configuration delay. |
| Tri-state outputs with enable | Allows bus sharing in multi-peripheral SPI systems via external EN control (not present on SI86SS41EC-AS1 but supported in family). |
| Selectable fail-safe mode | Default-low output behavior during VDD1 undervoltage prevents spurious peripheral activation in fault conditions. |
| Schmitt trigger + CMOS thresholds | Provides >0.15×VDD input hysteresis and noise margin exceeding 1.5 V at 5 V supply. |
| Reinforced IEC 60747-17 rating | Validates suitability for medical (60601-1) and industrial (62368-1) safety-critical applications. |
Applications
| Isolated SPI Interface for Industrial ADCs | Motor Control Gate Driver Isolation |
|---|---|
Use Scenario: Connecting a precision SAR ADC (e.g., AD7606) to an MCU across a 1 kV DC bus in a PLC module. IC Role / Device Role / Timing Role: SPI signal isolator handling MOSI, MISO, SCLK, and CSb with sub-10 ns skew to preserve sampling integrity. Use Value: Prevents ground loop errors and high-voltage transients from corrupting 16-bit conversion results. | Use Scenario: Isolating PWM and fault feedback signals between a DSP and three-phase IGBT gate drivers in an EV traction inverter. IC Role / Device Role / Timing Role: Bidirectional SPI interface for configuring gate driver ICs and reading DESAT/UVLO status with deterministic latency. Use Value: Enables safe, real-time protection response with <15 ns total propagation delay across all four channels. |
| Onboard Charger Communication Link | Battery Management System Isolation |
Use Scenario: Isolating SPI communication between OBC controller MCU and isolated DC-DC converter monitoring ICs. IC Role / Device Role / Timing Role: SPI isolator transmitting telemetry (voltage, temperature, fault flags) from secondary-side sensors to primary-side host. Use Value: Maintains functional safety compliance (ISO 26262 ASIL-B) while supporting 10+ Mbps telemetry rates. | Use Scenario: Isolating cell voltage measurement ICs (e.g., LTC6813) from main BMS controller in a 400 V battery pack. IC Role / Device Role / Timing Role: SPI isolator relaying stack voltage readings and balancing commands across 600 VRMS barrier. Use Value: Eliminates measurement offset caused by common-mode noise in high-di/dt battery switching environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM3401CRWZ | 4-channel, 50 Mbps, 2500 VRMS, SOIC-16 narrow-body; no dedicated SPI pin mapping. | Limited to lower-speed industrial sensors; lacks AEC-Q100 qualification and 6 kVRMS rating. | Choose when cost sensitivity outweighs speed, safety, and automotive requirements. |
| SI86SS51EC-AS1 | Same pinout and SPI functionality, plus isolated RST and ISO_RST pins for reset coordination. | Required where synchronized reset across isolation barrier is needed for fault recovery in safety-critical systems. | Choose over SI86SS41EC-AS1 only if isolated reset signaling is mandatory in your design. |
Compared with ADUM3401CRWZ, SI86SS41EC-AS1 delivers 3× higher data rate and 2.4× higher isolation voltage, enabling next-gen OBC and BMS designs; versus SI86SS51EC-AS1, it reduces component count where isolated reset is unnecessary, lowering BOM cost and layout complexity.
Availability
SI86SS41EC-AS1 is available at Aetrix Electronics and suitable for industrial automation systems, onboard chargers, and battery management systems requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for SI86SS41EC-AS1 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 analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-reliability applications.
The Si86Sxx family was developed to replace optocouplers in industrial and automotive systems, delivering higher speed, lower power, and certified reinforced isolation without optical degradation or aging effects.
FAQ
What is the isolation voltage rating of the SI86SS41EC-AS1 and which safety standards does it meet?
The SI86SS41EC-AS1 provides 6000 VRMS reinforced isolation per UL 1577 for 1 minute and complies with IEC 60747-17, CSA 62368-1/60601-1, and CQC GB4943.1. This rating is achieved using its WB SOIC-16 package and is validated for use in medical, industrial, and automotive applications where high working voltage endurance is required. The SI86SS41EC-AS1 maintains this rating across its full operating temperature range of –40 to 125 °C.
Does the SI86SS41EC-AS1 require external components for stable operation?
Yes, the SI86SS41EC-AS1 requires 0.1 µF and 10 µF bypass capacitors on both VDD1–GND1 and VDD2–GND2 pairs, placed as close as possible to the pins. These capacitors stabilize the internal RF oscillator and demodulator circuits. No pull-up/pull-down resistors are required on SPI pins unless system-level noise exceeds 100 kV/µs transient immunity; in such cases, 50–300 Ω series resistors may be added per datasheet recommendation. The SI86SS41EC-AS1 does not need startup initialization or configuration registers.
How does the fail-safe mode function on the SI86SS41EC-AS1 during power loss?
The SI86SS41EC-AS1 is ordered with default-low fail-safe behavior, meaning that when VDD1 falls below 2.1 V (UVLO– threshold), all outputs on Side B (SI, SCLK, SCSb) are actively driven low while VDD2 remains powered. This prevents unintended activation of downstream peripherals like ADCs or gate drivers during brown-out conditions. The behavior is hardware-defined by the ordering option "EC" and does not require software configuration. The SI86SS41EC-AS1 resumes normal operation within 0.3 ms after VDD1 rises above UVLO+.
Can the SI86SS41EC-AS1 be used in automotive applications, and what qualifications support this?
Yes, the SI86SS41EC-AS1 is AEC-Q100 qualified for Grade 1 (–40 to 125 °C), with manufacturing performed using automotive-specific process flows to ensure low defectivity. It supports AIAG-compliant PPAP documentation and IMDS/CAMDS reporting. Its 6000 VRMS isolation, 100 kV/µs CMTI, and operation up to 125 °C make it suitable for onboard chargers, battery management systems, and traction inverter control units in BEV/HEV platforms. The SI86SS41EC-AS1 meets functional safety requirements for ASIL-B system integration.
What is the pin compatibility between SI86SS41EC-AS1 and SI86SS51EC-AS1?
The SI86SS41EC-AS1 and SI86SS51EC-AS1 share identical pinouts, package (WB SOIC-16), and core SPI functionality (MCSb, MCLK, MO, MI, SI, SO, SCLK, SCSb). The only difference is that SI86SS51EC-AS1 substitutes NC pins 7 and 15 with RST and ISO_RST for isolated reset signaling. Therefore, SI86SS41EC-AS1 can be used as a drop-in replacement in designs that do not require isolated reset, but SI86SS51EC-AS1 cannot replace SI86SS41EC-AS1 without PCB modification due to different pin functions at those locations.
SI86SS41EC-AS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- SPI
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- 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
SI86SS41EC-AS1 FAQ
1.How can I place an order for SI86SS41EC-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SS41EC-AS1 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 SI86SS41EC-AS1 reliable?
The price and inventory of SI86SS41EC-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SS41EC-AS1 is usually 5 days.
3.What payment methods are accepted for SI86SS41EC-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SS41EC-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SS41EC-AS1?
SI86SS41EC-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SS41EC-AS1 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 SI86SS41EC-AS1?
For technical support, including SI86SS41EC-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SS41EC-AS1 requirements.
6.How does Aetrix verify that SI86SS41EC-AS1 is sourced from the original manufacturer or authorized distributors?
All SI86SS41EC-AS1 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 SI86SS41EC-AS1 meets industry standards.
7.What is the process for return or replacement of SI86SS41EC-AS1?
All SI86SS41EC-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI86SS41EC-AS1, 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 SI86SS41EC-AS1 part is unused and in its original packaging.
Return procedure for SI86SS41EC-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SS41EC-AS1 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.
-
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.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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