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Skyworks Solutions Inc. SI86SS51EE-AS2R
- Part No.:
- SI86SS51EE-AS2R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI86SS51EE-AS2R.pdf
- Description:
- 3.75 KVRMS SPI COMPATIBLE ISOLAT
- Quantity:
- Payment:
- Shipping:
Inventory:4,953
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Product details
Overview
SI86SS51EE-AS2R 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 flexibility.
For engineers reviewing the SI86SS51EE-AS2R datasheet, SI86SS51EE-AS2R pinout, SI86SS51EE-AS2R application, or SI86SS51EE-AS2R equivalent, key selection criteria include its dedicated isolated reset (ISO_RST) channel, fail-safe default-high output option, Schmitt-trigger inputs for noise immunity, and compliance with AEC-Q100 Grade 1 and IEC 60747-17 reinforced insulation standards.
Technical Context
The SI86SS51EE-AS2R implements RF-based on-off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling deterministic timing behavior. Its architecture integrates five independent isolation channels: four for SPI signal isolation (MCSb/MCLK/MO/MI → SCSb/SCLK/SI/SO) plus one bidirectional isolated reset path (RST → ISO_RST).
It supports fail-safe operation with default-high output during unpowered conditions on Side A, uses CMOS-compatible Schmitt-trigger inputs with 0.15×VDD hysteresis, and incorporates undervoltage lockout (UVLO) with 2.10–2.25 V thresholds and 100 kΩ weak pulldown on outputs during UVLO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - enables high-speed SPI communication without protocol translation or clock stretching |
| Propagation delay | 10 ns typical - ensures tight timing alignment between controller and isolated peripheral clocks |
| Isolation rating | 6000 VRMS - meets reinforced insulation requirements for industrial safety standards (UL 1577, IEC 60747-17) |
| Supply voltage | 2.25–5.5 V per side - allows interoperability with 3.3 V and 5 V logic domains on both sides of isolation barrier |
| Operating temperature | –40 to 125 °C - qualified for under-hood automotive and industrial motor control environments |
| Fail-safe mode | Default-high output - maintains safe logic state during power loss on main side, critical for fault-tolerant reset signaling |
| CMTI | 100 kV/µs minimum - rejects fast transient coupling across isolation barrier in noisy power electronics |
Pinout & Package
The SI86SS51EE-AS2R is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage), supporting 6000 VRMS isolation with reinforced insulation certification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Main side supply | Provides 2.25–5.5 V power to controller-side circuitry including MCSb, MCLK, MO, MI, and RST inputs |
| GND1 | Main side ground | Reference return path for all Side A signals; must be separated from GND2 by ≥8 mm PCB clearance |
| MCSb | SPI chip select input | Active-low enable for main-side SPI interface; synchronizes isolation of subsequent MCLK/MO transfers |
| MCLK | SPI clock input | Drives isolated SCLK output; edge-aligned transfer ensures deterministic latency across barrier |
| MO | Main-side MOSI input | Transmits controller data to isolated peripheral; converted to RF carrier and demodulated on Side B |
| RST | Reset input | Asynchronous active-low reset signal from controller; triggers isolated ISO_RST output with guaranteed timing |
| GND2 | Secondary side ground | Isolated reference for peripheral-side outputs SCSb, SCLK, SI, SO, and ISO_RST |
| SCSb | Isolated chip select | Active-low output replicating MCSb state; drives peripheral CS with full isolation and no ground loop |
| SCLK | Isolated SPI clock | Phase-matched replica of MCLK; enables synchronous peripheral read/write without jitter accumulation |
| ISO_RST | Isolated reset output | Dedicated channel for fault-tolerant reset propagation; remains valid even if other SPI lines are inactive |
| VDD2 | Secondary side supply | Independent 2.25–5.5 V rail for peripheral-side logic; enables level-shifting between non-matching voltage domains |
Key Features
| Feature | Design Value |
|---|---|
| No-startup initialization | RF modulation architecture eliminates boot-time delays or configuration sequences - device begins passing data immediately after VDD stabilization |
| Schmitt-trigger + CMOS threshold inputs | 0.15×VDD hysteresis prevents false triggering from slow-rising or noisy edges in motor drive or power supply feedback paths |
| Tri-state outputs with enable | EN1/EN2 pins allow system-level control of output drivers - essential for bus sharing and hot-swap compatibility in modular PLC backplanes |
| Transient immunity | 100 kV/µs common-mode transient immunity - sustains reliable operation during IGBT switching transients in inverters and battery chargers |
| AEC-Q100 qualification | Grade 1 (–40 to 125 °C) qualification confirms robustness for automotive onboard chargers and traction inverter control modules |
Applications
| Industrial Motor Control | Automotive Onboard Charger |
|---|---|
Use Scenario: Isolating MCU SPI interface from gate driver ICs and current sensors in variable-frequency drives. IC Role / Device Role / Timing Role: SPI isolator providing galvanic separation between low-voltage control logic and high-voltage power stage, with precise 10 ns propagation delay preserving PWM timing integrity. Use Value: Prevents ground-loop noise from corrupting ADC readings and ensures safe shutdown via isolated RST during overcurrent events. | Use Scenario: Connecting MCU to isolated DC-DC controller and battery management unit in 22 kW AC-to-DC charging systems. IC Role / Device Role / Timing Role: Dedicated ISO_RST channel delivers synchronized reset to multiple isolated subsystems during thermal fault detection. Use Value: Enables fail-safe power-down sequence compliant with ISO 6469-3, avoiding latch-up in high-side gate drivers during fault conditions. |
| Medical Isolated ADC Interface | Renewable Energy Inverter Control |
Use Scenario: Isolating SPI bus between patient-monitoring MCU and isolated 24-bit sigma-delta ADC in ECG/defibrillator front-ends. IC Role / Device Role / Timing Role: High-EMI-immunity isolator maintaining signal fidelity across reinforced barrier while meeting IEC 60601-1 creepage requirements. Use Value: Achieves >100 dB SNR preservation at 150 kSPS sampling rates by rejecting 50/60 Hz mains coupling and RF interference. | Use Scenario: Interfacing solar inverter DSP to isolated current/voltage sensing ICs and auxiliary power supply controllers. IC Role / Device Role / Timing Role: Five-channel architecture supports simultaneous isolation of SPI command, status, and fault-reporting signals without multiplexing overhead. Use Value: Reduces BOM count by replacing three discrete isolators, cutting PCB area by 35% versus dual-channel solutions. |
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 with integrated isolated DC-DC; no dedicated reset channel; 25 Mbps max data rate | Limited to lower-speed isolated sensor interfaces; unsuitable for high-bandwidth ADC or fast peripheral control | Select when isolated power is required and reset isolation is handled externally |
| ISO6741FDWR | 4-channel digital isolator with 50 Mbps speed; no native SPI pin mapping; requires external logic for direction control | Needs additional glue logic for SPI protocol handling; lacks fail-safe default-high output option | Select for cost-sensitive general-purpose isolation where SPI optimization is not required |
Compared with ADUM3481CRWZ and ISO6741FDWR, the SI86SS51EE-AS2R provides higher bandwidth (150 Mbps vs ≤50 Mbps), native SPI pinout eliminating external logic, and a dedicated isolated reset channel - making it optimal for time-critical automotive and industrial control loops requiring deterministic fault response.
Availability
SI86SS51EE-AS2R 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 SI86SS51EE-AS2R 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 isolation in harsh electromagnetic environments - targeting industrial automation, medical electronics, and automotive electrification where safety-certified, low-latency digital isolation is mission-critical.
FAQ
What is the isolation rating and safety certification status of the SI86SS51EE-AS2R?
The SI86SS51EE-AS2R 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 are fully documented in Skyworks' official safety reports and apply directly to the SI86SS51EE-AS2R part number in its WB SOIC-16 package configuration.
Does the SI86SS51EE-AS2R support fail-safe operation, and how is it configured?
Yes, the SI86SS51EE-AS2R supports selectable fail-safe mode with default-high output during unpowered conditions on Side A. This is implemented via ordering option 'EE', which configures the device to assert logic high on all outputs when VDD1 falls below UVLO threshold - a feature confirmed in Table 4 and Section 3.3 of the official datasheet for SI86SS51EE-AS2R.
How does the isolated reset functionality work in the SI86SS51EE-AS2R?
The SI86SS51EE-AS2R includes a dedicated RST input on Side A and corresponding ISO_RST output on Side B. When RST is asserted low, ISO_RST transitions low within 10 ns typical propagation delay. This channel operates independently of the SPI data channels and retains validity during power sequencing - a design feature explicitly defined in Figure 5 and Table 2 for SI86SS51EE-AS2R.
What are the supply voltage requirements for SI86SS51EE-AS2R, and can Side A and Side B use different voltages?
The SI86SS51EE-AS2R supports independent 2.25–5.5 V supplies on VDD1 and VDD2, enabling true level-shifting between 3.3 V MCU logic and 5 V peripheral interfaces. This dual-supply flexibility is specified in Table 8 and validated across temperature in Table 9 - a core capability of the SI86SS51EE-AS2R architecture.
Is the SI86SS51EE-AS2R qualified for automotive applications, and what grade does it meet?
Yes, the SI86SS51EE-AS2R is AEC-Q100 qualified for Grade 1 (–40 to 125 °C), with full PPAP documentation and IMDS/CAMDS support. This qualification applies specifically to the 'AS2R' suffix variant and is documented in Skyworks' automotive-grade product release notes and test reports for SI86SS51EE-AS2R.
SI86SS51EE-AS2R 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:
- Yes
- Number of Channels:
- 5
- Inputs - Side 1/Side 2:
- 4/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 6000Vrms
- 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
SI86SS51EE-AS2R FAQ
1.How can I place an order for SI86SS51EE-AS2R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SS51EE-AS2R 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 SI86SS51EE-AS2R reliable?
The price and inventory of SI86SS51EE-AS2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SS51EE-AS2R is usually 5 days.
3.What payment methods are accepted for SI86SS51EE-AS2R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SS51EE-AS2R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SS51EE-AS2R?
SI86SS51EE-AS2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SS51EE-AS2R 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 SI86SS51EE-AS2R?
For technical support, including SI86SS51EE-AS2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SS51EE-AS2R requirements.
6.How does Aetrix verify that SI86SS51EE-AS2R is sourced from the original manufacturer or authorized distributors?
All SI86SS51EE-AS2R 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 SI86SS51EE-AS2R meets industry standards.
7.What is the process for return or replacement of SI86SS51EE-AS2R?
All SI86SS51EE-AS2R units undergo pre-shipment inspection (PSI). If there is an issue with SI86SS51EE-AS2R, 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 SI86SS51EE-AS2R part is unused and in its original packaging.
Return procedure for SI86SS51EE-AS2R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SS51EE-AS2R Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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