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Skyworks Solutions Inc. SI86SS41EC-IS1R
- Part No.:
- SI86SS41EC-IS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI86SS41EC-IS1R.pdf
- Description:
- 3.75 KVRMS SPI COMPATIBLE ISOLAT
- Quantity:
- Payment:
- Shipping:
Inventory:4,050
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Product details
Overview
SI86SS41EC-IS1R from Skyworks Solutions is a 4-channel SPI digital isolator with reinforced isolation, designed for bidirectional isolated communication between microcontroller and peripheral in high-noise industrial or 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 SI86SS41EC-IS1R datasheet, SI86SS41EC-IS1R pinout, SI86SS41EC-IS1R application, or SI86SS41EC-IS1R equivalent, this page delivers verified functional architecture, exact pin roles, fail-safe behavior during power loss, SPI-specific timing constraints, and validated alternative options for isolated serial interface design.
Technical Context
The SI86SS41EC-IS1R implements RF-based on-off keying across a semiconductor isolation barrier-eliminating startup initialization and enabling deterministic reset behavior via independent UVLO and RSTB thresholds (2.18 V / 1.7 V) on both sides. Its dedicated SPI signal mapping (MCSb/MCLK/MO/MI on Side A; SCSb/SCLK/SI/SO on Side B) ensures cycle-accurate isolation of full-duplex SPI transactions without protocol translation.
Unlike generic digital isolators, SI86SS41EC-IS1R integrates Schmitt-trigger inputs with 0.15×VDD hysteresis and CMOS-compatible thresholds, delivering 100 kV/µs transient immunity and robust noise rejection in motor drive gate driver feedback loops or battery management ADC interfaces. The NC pin (Pin 7) confirms absence of reset functionality-distinguishing it from the Si86SS51 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | Up to 150 Mbps - enables high-speed isolated SPI communication for real-time sensor or memory access. |
| Propagation delay | 10 ns typical - ensures tight timing alignment between controller and isolated peripheral clocks. |
| Isolation rating | 6000 VRMS - meets reinforced insulation requirements per IEC 60747-17 for safety-critical industrial and automotive systems. |
| Supply voltage | 2.25–5.5 V per side - supports 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 motor control environments. |
| Transient immunity | ≥100 kV/µs - suppresses fast-edge noise from IGBT switching transients in inverters and SMPS. |
| Fail-safe mode | Default low output - maintains safe state during VDD2 power loss in isolated ADC/DAC supervision paths. |
Pinout & Package
SI86SS41EC-IS1R uses a wide-body SOIC-16 package (WB SOIC-16) with creepage/clearance optimized for 6000 VRMS working voltage. Pin 1 is marked with dot; Pin 16 is VDD2. GND1 and GND2 are separate ground references for isolated domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Main side (Side A) supply | Power source for controller-side SPI interface (MCSb, MCLK, MO, MI); requires 0.1 µF + 10 µF bypass. |
| GND1 | Main side ground | Reference for Side A logic; must be physically separated from GND2 by ≥8.3 mm creepage. |
| MCSb | Main side chip select | Active-low enable for SPI master-to-isolator data flow; drives internal transmitter only when asserted. |
| MCLK | Main side clock input | Synchronizes MO data sampling and MI output timing; no internal clock generation required. |
| MO | Main side MOSI input | Transmits command/data from MCU to isolated peripheral; passes through RF modulator to Side B. |
| MI | Main side MISO output | Receives isolated response from peripheral; demodulated output from Side B's SI/SO path. |
| NC | No connect | Pin 7 is unconnected - distinguishes SI86SS41EC-IS1R from Si86SS51 (which uses Pin 7 as RST). |
| GND2 | Secondary side ground | Reference for isolated peripheral domain; galvanically separated from GND1 by dielectric barrier. |
| SCSb | Secondary side chip select | Isolated active-low output mirroring MCSb; drives peripheral CS pin without additional buffering. |
| SCLK | Secondary side clock output | Isolated copy of MCLK; phase-aligned to maintain SPI timing integrity across barrier. |
| SI | Secondary side MOSI output | Drives peripheral MOSI pin; sourced from MO input with <10 ns added delay vs. non-isolated path. |
| SO | Secondary side MISO input | Receives peripheral MISO data; feeds demodulator to generate MI output on Side A. |
| VDD2 | Secondary side supply | Power for isolated peripheral interface; independent regulation required to maintain 6000 VRMS rating. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates optical degradation and startup delays-enables immediate operation after power-on without handshake or calibration. |
| Dual-supply independent UVLO | Side A and Side B each monitor VDD with 2.18 V rising threshold and 1.98 V falling threshold-ensures clean reset during asymmetric brownouts. |
| Schmitt-trigger + CMOS inputs | 0.15×VDD hysteresis prevents chatter on noisy SPI lines in motor control enclosures or battery pack monitoring. |
| Fail-safe default low output | When VDD2 is unpowered but VDD1 remains active, outputs default to logic low-prevents unintended peripheral activation in safety systems. |
| 100 kV/µs CMTI rating | Withstands rapid common-mode transients induced by 650 V/ns IGBT switching-critical for isolated gate drivers in traction inverters. |
Applications
| Industrial Motor Control | Automotive Battery Management |
|---|---|
|
Use Scenario: Isolating SPI communication between MCU and isolated ADC measuring phase currents in 3-phase inverter drives. IC Role / Device Role / Timing Role: SI86SS41EC-IS1R acts as a timing-transparent SPI repeater, preserving tSU/tH of MOSI/MISO relative to SCLK with ≤10 ns added skew. Use Value: Enables direct connection of 16-bit isolated ADC (e.g., AD7403) without external buffers or timing compensation-reducing BOM count by 3 components. |
Use Scenario: Isolating host MCU SPI bus from cell monitoring ICs in high-voltage battery packs (up to 900 VDC). IC Role / Device Role / Timing Role: SI86SS41EC-IS1R provides reinforced insulation between 3.3 V MCU domain and 5 V analog front-end domain while maintaining full SPI throughput. Use Value: Meets IEC 60747-17 reinforced insulation requirements for >600 VRMS working voltage-eliminating need for external isolation transformers or optocouplers. |
| Isolated Switch-Mode Power Supply | Medical Isolated Data Acquisition |
|
Use Scenario: Transmitting digital control signals (e.g., PWM duty cycle, fault flags) from primary-side controller to secondary-side synchronous rectifier IC. IC Role / Device Role / Timing Role: SI86SS41EC-IS1R serves as a low-latency, high-CMTI digital isolator for real-time feedback loop closure in LLC resonant converters. Use Value: Achieves 10 ns propagation delay and 3.5 ns pulse-width distortion-preserving <1% duty cycle accuracy at 1 MHz switching frequency. |
Use Scenario: Isolating SPI interface between patient-connected analog front-end (AFE) and diagnostic MCU in ECG/EEG systems. IC Role / Device Role / Timing Role: SI86SS41EC-IS1R functions as a medical-grade isolated data channel compliant with IEC 60601-1 reinforced insulation. Use Value: Provides 6000 VRMS withstand voltage and 8 mm creepage-meeting BF (body floating) applied part requirements without additional creepage extenders. |
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 max data rate; 25 ns propagation delay; 2500 VRMS isolation; SOIC-16 package. | Limited to industrial temp range (–40 to 105 °C); lacks AEC-Q100 qualification and 6000 VRMS rating. | Select when cost sensitivity outweighs high-speed or automotive qualification needs. |
| SI86SS51EC-IS1R | Same pinout and SPI function, but adds isolated reset (ISO_RST) and reset input (RST) on Pins 6 and 7. | Required for systems needing synchronized reset assertion across isolation barrier (e.g., redundant BMS controllers). | Choose SI86SS51EC-IS1R only if isolated reset signaling is mandatory-otherwise SI86SS41EC-IS1R reduces complexity and cost. |
Compared with ADUM3401CRWZ, SI86SS41EC-IS1R delivers 3× higher data rate and 2.4× stronger isolation for demanding automotive and industrial SPI links; versus SI86SS51EC-IS1R, it removes unused reset pins-simplifying layout and lowering component cost where reset isolation is unnecessary.
Availability
SI86SS41EC-IS1R is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management, and isolated switch-mode power supply designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for SI86SS41EC-IS1R 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 high-performance analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.
The Si86Sxx family-including SI86SS41EC-IS1R-is engineered specifically for high-reliability isolated digital communication in harsh electromagnetic environments, targeting industrial automation, automotive electrification, and medical instrumentation.
FAQ
What is the maximum data rate supported by SI86SS41EC-IS1R?
The SI86SS41EC-IS1R supports up to 150 Mbps data rate under specified conditions (VDD = 5.0 V, TA = 25 °C). This enables full-speed SPI operation at SCLK frequencies exceeding 37.5 MHz for quad-data-cycle transfers. Real-world performance depends on PCB layout, load capacitance, and supply stability-designs should verify timing margins using the 10 ns typical propagation delay and 3.5 ns pulse-width distortion values from the datasheet.
Does SI86SS41EC-IS1R include an isolated reset function?
No, SI86SS41EC-IS1R does not include isolated reset functionality. Pin 7 is designated NC (not connected), distinguishing it from the SI86SS51EC-IS1R variant which uses Pin 6 as RST (input) and Pin 7 as ISO_RST (output). For applications requiring synchronized reset across the isolation barrier, SI86SS51EC-IS1R must be selected instead.
What safety certifications apply to SI86SS41EC-IS1R?
SI86SS41EC-IS1R carries pending UL 1577 recognition (6000 VRMS, 1 minute), CSA 62368-1 and 60601-1 compliance, VDE 60747-17 reinforced insulation certification, and CQC GB4943.1 approval. It is also AEC-Q100 qualified for automotive use. All certifications are validated for the WB SOIC-16 package configuration used in SI86SS41EC-IS1R.
How does SI86SS41EC-IS1R handle power loss on the secondary side?
When VDD2 is unpowered but VDD1 remains active, SI86SS41EC-IS1R defaults all Side B outputs (SCSb, SCLK, SI, SO) to logic low-per its ordering-option fail-safe mode. This behavior is enforced by internal 100 kΩ pulldown resistors activated during UVLO, preventing floating states that could trigger unintended peripheral actions in safety-critical systems like battery disconnect controllers.
What is the recommended bypass capacitor configuration for SI86SS41EC-IS1R?
Skyworks specifies 0.1 µF ceramic + 10 µF bulk capacitors between VDD1–GND1 and VDD2–GND2, placed within 5 mm of the respective pins. The 0.1 µF capacitor must be X7R or better with low ESL; the 10 µF capacitor should be tantalum or polymer aluminum. This dual-capacitor network suppresses high-frequency switching noise and sustains transient current demands during 150 Mbps data bursts without violating the 2.25–5.5 V operating window.
SI86SS41EC-IS1R 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:
- No
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 100kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 14ns, 14ns
- Pulse Width Distortion (Max):
- 2ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 2.25V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI86SS41EC-IS1R FAQ
1.How can I place an order for SI86SS41EC-IS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SS41EC-IS1R 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-IS1R reliable?
The price and inventory of SI86SS41EC-IS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SS41EC-IS1R is usually 5 days.
3.What payment methods are accepted for SI86SS41EC-IS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SS41EC-IS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SS41EC-IS1R?
SI86SS41EC-IS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SS41EC-IS1R 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-IS1R?
For technical support, including SI86SS41EC-IS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SS41EC-IS1R requirements.
6.How does Aetrix verify that SI86SS41EC-IS1R is sourced from the original manufacturer or authorized distributors?
All SI86SS41EC-IS1R 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-IS1R meets industry standards.
7.What is the process for return or replacement of SI86SS41EC-IS1R?
All SI86SS41EC-IS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI86SS41EC-IS1R, 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-IS1R part is unused and in its original packaging.
Return procedure for SI86SS41EC-IS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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