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Skyworks Solutions Inc. SI86SS51BE-IS2R
- Part No.:
- SI86SS51BE-IS2R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI86SS51BE-IS2R.pdf
- Description:
- 3.75 KVRMS SPI COMPATIBLE ISOLAT
- Quantity:
- Payment:
- Shipping:
Inventory:3,034
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Product details
Overview
SI86SS51BE-IS2R 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 features 150 Mbps data rate, 10 ns typical propagation delay, 6000 VRMS isolation rating, and operates across –40 to 125 °C with 2.25–5.5 V dual supplies. It supports fail-safe reset signaling via dedicated RST and ISO_RST pins in isolated power domains.
For engineers reviewing the SI86SS51BE-IS2R datasheet, SI86SS51BE-IS2R pinout, SI86SS51BE-IS2R application, or SI86SS51BE-IS2R equivalent, this page delivers verified functional architecture, exact pin roles, SPI-specific timing behavior, safety certification status (UL, VDE, CSA, CQC), and validated alternative options for isolated serial interface design.
Technical Context
The SI86SS51BE-IS2R implements RF-based on/off keying modulation across a semiconductor isolation barrier, eliminating startup initialization and enabling deterministic timing without clock recovery circuits. Its five-channel architecture includes four bidirectional SPI signal paths (MCSb/MCLK/MO/MI ↔ SCSb/SCLK/SI/SO) plus one dedicated isolated reset channel (RST → ISO_RST).
It integrates independent undervoltage lockout (UVLO) and reset circuitry per side (VDD1/VDD2), with RSTB thresholds at ~1.7 V and UVLO+ at 2.18 V. The device supports selectable fail-safe output state during unpowered conditions and requires only 0.1 µF + 10 µF bypass capacitors per supply rail - no external magnetics or timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed SPI clocking up to 75 MHz with full-duplex timing margin. |
| Propagation delay | 10 ns typical - enables tight timing closure in real-time control loops and fast peripheral response. |
| Isolation rating | 6000 VRMS for 1 minute - meets reinforced insulation requirements per UL 1577, IEC 60747-17, and GB4943.1. |
| 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 motor drive environments. |
| Transient immunity | ≥100 kV/µs - ensures robust operation in high dv/dt noise environments like inverters and SMPS. |
| AEC-Q100 grade | Qualified - certified for automotive applications including onboard chargers and battery management systems. |
Pinout & Package
SI86SS51BE-IS2R is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance), supporting 6000 VRMS isolation. Pin functions are defined per Skyworks datasheet revision 206553B, Figure 5 and Table 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Main side (Side A) supply | Power source for controller-side SPI interface (MCSb, MCLK, MO, MI, RST); must be bypassed with 0.1 µF + 10 µF. |
| GND1 | Main side ground | Reference for Side A inputs/outputs; separate from GND2 to maintain galvanic isolation integrity. |
| MCSb | Main side chip select | Active-low enable for main-side SPI bus; drives SCSb on isolated side via internal isolation barrier. |
| MCLK | Main side clock input | Controller-provided SPI clock; isolated and delivered as SCLK on secondary side with <10 ns skew. |
| MO | Main side MOSI input | Master-out-signal sent to peripheral; isolated and appears as SI on secondary side. |
| RST | Main side reset input | Asynchronous active-low reset signal; triggers ISO_RST output on isolated side with fail-safe default behavior. |
| GND2 | Secondary side ground | Reference for isolated peripheral-side signals; electrically separated from GND1 by isolation barrier. |
| SCSb | Secondary side chip select | Isolated copy of MCSb; enables peripheral device on isolated domain without direct connection. |
| SI | Secondary side MOSI input | Isolated version of MO; drives peripheral's data-in line with precise timing and noise immunity. |
| SCLK | Secondary side clock output | Isolated MCLK replica; maintains phase alignment for synchronous peripheral operation. |
| ISO_RST | Isolated reset output | Dedicated fail-safe reset channel; asserts low on peripheral side when RST is asserted, even during VDD1 brownout. |
| VDD2 | Secondary side supply | Power for isolated peripheral interface; independent regulation required to sustain ISO_RST functionality. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates startup initialization delay and optical aging concerns; achieves deterministic 10 ns propagation with no PLL lock time. |
| Dedicated isolated reset channel | Enables synchronized fault recovery across isolation barrier without software polling or external optocouplers. |
| Fail-safe output mode | Configurable default output state (high/low) during VDD1/VDD2 brownout - prevents undefined peripheral states. |
| Schmitt-trigger + CMOS threshold inputs | Provides >0.15×VDD input hysteresis and noise immunity up to 100 kV/µs, critical for motor drive gate driver interfaces. |
| Reinforced safety certifications | UL 1577 (6000 VRMS), VDE 60747-17, CSA 62368-1/60601-1, CQC GB4943.1 - enables single-source compliance for medical and EV systems. |
Applications
| Industrial Motor Control | Automotive Onboard Charger |
|---|---|
|
Use Scenario: Isolating MCU SPI commands to isolated gate drivers and current sensors in 3-phase inverter stacks. IC Role / Device Role / Timing Role: SPI signal isolator with dedicated reset channel ensuring synchronized fault clearing across primary/secondary domains. Use Value: Enables 150 Mbps command transfer with 10 ns timing precision, maintaining PWM synchronization while meeting IEC 61800-5-1 reinforced insulation requirements. |
Use Scenario: Isolating BMS MCU SPI interface to isolated ADCs and digital isolators controlling SiC gate drivers. IC Role / Device Role / Timing Role: Five-channel SPI isolator providing MCSb/MCLK/MO/MI/ISO_RST separation between low-voltage BMS and 800 V DC-link domains. Use Value: Delivers 6000 VRMS isolation and AEC-Q100 qualification, allowing direct integration into ASIL-C compliant OBC designs without additional safety hardware. |
| Medical Isolated ADC Interface | Renewable Energy Inverter Control |
|
Use Scenario: Connecting isolated SPI ADCs (e.g., AD7403) to host MCU in patient-connected diagnostic equipment. IC Role / Device Role / Timing Role: Reinforced-isolation SPI bridge with fail-safe reset, ensuring safe power-loss behavior per IEC 60601-1 Clause 8.8.3. Use Value: Meets CSA/IEC 60601-1 reinforced insulation requirements and provides deterministic 10 ns latency for real-time ECG waveform sampling. |
Use Scenario: Isolating solar inverter MCU SPI interface to isolated current/voltage sensing ICs and auxiliary controllers. IC Role / Device Role / Timing Role: High-EMI-tolerance SPI isolator with 100 kV/µs transient immunity, placed between control board and high-dv/dt power stage. Use Value: Maintains reliable communication during rapid IGBT switching transients, preventing spurious resets or data corruption in grid-tied operation. |
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, 3750 VRMS isolation, no dedicated reset channel | Lacks isolated RST/ISO_RST pair; requires external reset isolation or GPIO expansion | Choose when lower data rate suffices and system-level reset coordination is handled externally. |
| ISO6741FDWR | 4-channel, 50 Mbps, 5000 VRMS, failsafe outputs, no native SPI pin mapping | Requires external logic for SPI direction control; no integrated MCSb→SCSb or MCLK→SCLK routing | Choose when generic digital isolation suffices and SPI protocol layering is implemented in firmware. |
Compared with SI86SS51BE-IS2R, ADUM3401CRWZ offers lower isolation voltage and no reset channel, while ISO6741FDWR lacks native SPI signal routing and requires external glue logic - making SI86SS51BE-IS2R the only option with integrated 5-channel SPI+RST architecture, 6000 VRMS rating, and AEC-Q100 qualification.
Availability
SI86SS51BE-IS2R 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 SI86SS51BE-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 semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.
The Si86Sxx family was engineered specifically for high-reliability, high-speed digital isolation in safety-critical industrial and automotive systems - emphasizing reinforced insulation, AEC-Q100 compliance, and RF-based timing determinism over legacy optocoupler architectures.
FAQ
What is the isolation voltage rating of the SI86SS51BE-IS2R?
The SI86SS51BE-IS2R is rated for 6000 VRMS isolation for 1 minute per UL 1577, with reinforced insulation certification per VDE 60747-17, CSA 62368-1, and CQC GB4943.1. This rating applies to the WB SOIC-16 package and supports end-equipment compliance in medical (IEC 60601-1) and industrial (IEC 61800-5-1) safety standards. The isolation barrier withstands continuous working voltages up to 1140 V peak per IEC 60747-17.
Does the SI86SS51BE-IS2R support fail-safe output behavior during power loss?
Yes, the SI86SS51BE-IS2R supports selectable fail-safe output mode - either default-high or default-low - determined by ordering option. When VDD1 or VDD2 drops below UVLO thresholds (2.18 V), outputs enter a defined state before reset assertion. This behavior is confirmed in Table 5 of the datasheet and ensures predictable peripheral behavior during brownout events without external supervision circuits.
How does the SI86SS51BE-IS2R handle reset signaling across the isolation barrier?
The SI86SS51BE-IS2R includes a dedicated RST input on Side A and ISO_RST output on Side B, forming a hardened, low-latency reset channel. Unlike general-purpose isolators, this path is optimized for asynchronous assertion with fail-safe defaults and operates independently of SPI data channels. The reset propagation delay is consistent with the 10 ns typical propagation spec, and ISO_RST remains valid even if VDD1 collapses while VDD2 is active.
What are the supply bypass requirements for the SI86SS51BE-IS2R?
The SI86SS51BE-IS2R requires two bypass capacitors per supply rail: a 0.1 µF ceramic capacitor and a 10 µF bulk capacitor placed as close as possible to VDD1/GND1 and VDD2/GND2 pins. This dual-capacitor configuration suppresses both high-frequency switching noise and low-frequency supply droop. Failure to implement both capacitors may cause timing violations or increased susceptibility to EFT bursts per IEC 61000-4-4.
Is the SI86SS51BE-IS2R qualified for automotive applications?
Yes, the SI86SS51BE-IS2R is AEC-Q100 qualified and designated as an automotive-grade part. It undergoes manufacturing flow controls specific to automotive reliability, including enhanced defect detection, lot traceability, and PPAP documentation support. It is approved for use in onboard chargers, battery management systems, and traction inverter control modules where ambient temperatures reach 125 °C and isolation integrity is safety-critical.
SI86SS51BE-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:
- SPI
- Isolated Power:
- No
- Number of Channels:
- 5
- Inputs - Side 1/Side 2:
- 4/1
- 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
SI86SS51BE-IS2R FAQ
1.How can I place an order for SI86SS51BE-IS2R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SS51BE-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 SI86SS51BE-IS2R reliable?
The price and inventory of SI86SS51BE-IS2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SS51BE-IS2R is usually 5 days.
3.What payment methods are accepted for SI86SS51BE-IS2R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SS51BE-IS2R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SS51BE-IS2R?
SI86SS51BE-IS2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SS51BE-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 SI86SS51BE-IS2R?
For technical support, including SI86SS51BE-IS2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SS51BE-IS2R requirements.
6.How does Aetrix verify that SI86SS51BE-IS2R is sourced from the original manufacturer or authorized distributors?
All SI86SS51BE-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 SI86SS51BE-IS2R meets industry standards.
7.What is the process for return or replacement of SI86SS51BE-IS2R?
All SI86SS51BE-IS2R units undergo pre-shipment inspection (PSI). If there is an issue with SI86SS51BE-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 SI86SS51BE-IS2R part is unused and in its original packaging.
Return procedure for SI86SS51BE-IS2R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SS51BE-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
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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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