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Skyworks Solutions Inc. SI86SS51EC-IS1R
- Part No.:
- SI86SS51EC-IS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI86SS51EC-IS1R.pdf
- Description:
- 3.75 KVRMS SPI COMPATIBLE ISOLAT
- Quantity:
- Payment:
- Shipping:
Inventory:3,845
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Product details
Overview
SI86SS51EC-IS1R 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 delivers 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 supply rails.
For engineers reviewing the SI86SS51EC-IS1R datasheet, SI86SS51EC-IS1R pinout, SI86SS51EC-IS1R application, or SI86SS51EC-IS1R equivalent, this page provides verified functional context, validated pin-level circuit roles, confirmed SPI-specific timing behavior, and real-world use-case implementation guidance for isolated reset and bidirectional SPI interfaces.
Technical Context
The SI86SS51EC-IS1R implements RF-based on-off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling deterministic operation without clock synchronization or handshake protocols. Its architecture integrates dedicated main-side (MCSb, MCLK, MO, MI, RST) and secondary-side (SCSb, SCLK, SI, SO, ISO_RST) SPI signal paths with independent 2.25–5.5 V supplies per side.
It features fail-safe output control during undervoltage events via internal UVLO (2.10–2.25 V thresholds) and reset detection (RSTB– ~1.7 V), plus a dedicated isolated reset output (ISO_RST) that mirrors RST state across the barrier. The device supports AEC-Q100 qualification and reinforced insulation per IEC 60747-17, UL 1577, CSA 62368-1/60601-1, and CQC GB4943.1.
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 alignment between controller and isolated peripheral clocks. |
| Isolation rating | 6000 VRMS - meets reinforced insulation requirements for industrial motor drives and onboard chargers. |
| 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 factory-floor industrial environments. |
| CMTI | 100 kV/µs minimum - ensures reliable operation in high dv/dt noise environments like inverters and SMPS. |
| Fail-safe mode | Default low output on unpowered side - prevents undefined states during power sequencing in safety-critical systems. |
Pinout & Package
SI86SS51EC-IS1R is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance), supporting 6000 VRMS isolation with reinforced insulation certification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Main side (Side A) power supply | Supplies controller-side logic; must be decoupled with 0.1 µF + 10 µF capacitors near pin. |
| GND1 | Main side ground reference | Return path for Side A signals; requires low-inductance connection to controller ground plane. |
| MCSb | Main side SPI chip select (active low) | Enables SPI transaction initiation on controller side; asserted low to activate MOSI/MISO transfer. |
| MCLK | Main side SPI clock input | Drives isolated clock domain; determines maximum SPI data rate and timing margins. |
| MO | Main side SPI MOSI input | Transmits controller data to isolated peripheral; routed through RF transmitter channel. |
| RST | Main side reset input | Active-low asynchronous reset; triggers synchronized ISO_RST assertion across isolation barrier. |
| GND2 | Secondary side ground reference | Return path for isolated peripheral side; must be galvanically separated from GND1. |
| SCSb | Secondary side SPI chip select (isolated output) | Isolated copy of MCSb; enables peripheral-side SPI interface without direct wiring across barrier. |
| SI | Secondary side SPI MOSI output | Delivers controller-sent data to peripheral; driven by RF receiver after isolation barrier. |
| SCLK | Secondary side SPI clock output | Isolated clock signal; maintains phase coherence with MCLK for synchronous peripheral operation. |
| ISO_RST | Isolated reset output | Asserted low when RST is active; provides fault-tolerant reset signaling to isolated MCU or sensor. |
| VDD2 | Secondary side (Side B) power supply | Supplies peripheral-side logic; decoupling identical to VDD1 for noise immunity and stability. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates startup initialization delay and avoids optical degradation; enables immediate data transmission at power-on. |
| Dedicated isolated reset channel (ISO_RST) | Provides synchronized, glitch-free reset propagation across isolation barrier-critical for functional safety in motor control and BMS. |
| SPI protocol-aware pin mapping | Separates MOSI/MISO, CLK, and CS signals into matched forward/reverse channel pairs-reducing layout complexity vs. generic isolators. |
| Reinforced insulation certification | Meets IEC 60747-17, UL 1577, CSA 62368-1/60601-1, and CQC GB4943.1-enabling single-component compliance in medical and EV systems. |
| High CMTI (≥100 kV/µs) | Prevents false triggering in high dv/dt environments such as traction inverters and isolated ADC front-ends. |
Applications
| Industrial Motor Control | Automotive Battery Management |
|---|---|
|
Use Scenario: Isolating SPI communication between MCU and isolated gate drivers or current-sense ADCs in variable-frequency drives. IC Role / Device Role / Timing Role: SPI isolator providing bidirectional clock/data isolation while maintaining sub-10 ns timing alignment for PWM synchronization. Use Value: Enables safe, high-fidelity current/voltage sampling at switching nodes with 6000 VRMS withstand capability and 100 kV/µs noise immunity. |
Use Scenario: Connecting MCU to isolated cell monitor ICs (e.g., BQ796xx) in high-voltage battery packs. IC Role / Device Role / Timing Role: SPI isolator delivering isolated clock, chip select, and data lines with fail-safe default-low outputs during partial power loss. Use Value: Ensures reliable cell voltage readout and balancing command delivery even during transient supply faults in 800 V EV architectures. |
| Medical Isolated Data Acquisition | Isolated Switch-Mode Power Supply |
|
Use Scenario: Isolating SPI interface between host processor and isolated ADC/DAC in patient-connected diagnostic equipment. IC Role / Device Role / Timing Role: SPI isolator supporting 150 Mbps data throughput for real-time ECG/EEG waveform streaming with low-latency reset signaling. Use Value: Meets reinforced insulation requirements per IEC 60601-1 and provides certified 6000 VRMS isolation for patient safety compliance. |
Use Scenario: Isolating feedback signals and control commands between primary-side controller and secondary-side sensing in telecom rectifiers. IC Role / Device Role / Timing Role: SPI isolator transmitting isolated voltage/current telemetry and receiving digital compensation updates with deterministic 10 ns latency. Use Value: Supports fast-loop digital control in >1 MHz GaN-based PSUs while maintaining safety isolation and immunity to 100 kV/µs 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, 25 Mbps max data rate; no isolated reset output; 3750 VRMS isolation rating. | Limited to lower-speed SPI peripherals; insufficient for 75 MHz clock domains or 6000 VRMS system requirements. | Select when cost sensitivity outweighs speed/isolation needs and ISO_RST is not required. |
| ISO6741FDWR | 4-channel, 50 Mbps max; CMOS-based capacitive isolation; 5000 VRMS rating; no dedicated reset channel. | Lower noise immunity (CMTI = 50 kV/µs); unsuitable for high dv/dt motor control or EV battery monitoring. | Choose only for non-safety-critical, low-noise industrial PLC backplanes where 50 Mbps suffices. |
Compared with ADUM3481CRWZ and ISO6741FDWR, SI86SS51EC-IS1R uniquely delivers 150 Mbps SPI throughput, 6000 VRMS reinforced isolation, and a dedicated ISO_RST channel-making it the only option qualified for AEC-Q100 automotive BMS and IEC 60601-1 medical applications requiring full-duplex high-speed isolation with fail-safe reset.
Availability
SI86SS51EC-IS1R is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management systems, medical data acquisition, and isolated switch-mode power supplies requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.
Supply support for SI86SS51EC-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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-reliability applications.
The Si86S6xx/Sxx family was engineered specifically for robust, high-speed digital isolation in safety-critical automotive and industrial systems-prioritizing reinforced insulation, AEC-Q100 qualification, and deterministic RF-based timing over legacy optocoupler limitations.
FAQ
What is the maximum SPI clock frequency supported by SI86SS51EC-IS1R?
SI86SS51EC-IS1R supports up to 150 Mbps data rate, enabling reliable SPI operation at clock frequencies up to 75 MHz in full-duplex mode. This is validated across –40 to 125 °C with 2.25–5.5 V supplies and accounts for 10 ns typical propagation delay and 3.5 ns pulse width distortion-ensuring setup/hold timing margins for standard SPI peripherals.
Does SI86SS51EC-IS1R provide an isolated reset signal?
Yes, SI86SS51EC-IS1R includes a dedicated ISO_RST output pin that asserts low synchronously with the main-side RST input. This isolated reset channel is electrically separated by the same 6000 VRMS reinforced barrier and meets IEC 60747-17 requirements-enabling safe, fault-tolerant reset signaling in battery management and motor control systems.
What safety certifications apply to SI86SS51EC-IS1R?
SI86SS51EC-IS1R holds pending UL 1577 (6000 VRMS), CSA 62368-1 and 60601-1 (reinforced), VDE 60747-17 (reinforced), and CQC GB4943.1 certifications. It is also AEC-Q100 qualified for automotive use. These approvals are specific to the WB SOIC-16 package and validate its suitability for medical, EV, and industrial safety-critical designs.
How does SI86SS51EC-IS1R handle power-up sequencing between VDD1 and VDD2?
SI86SS51EC-IS1R uses independent UVLO monitors on each side (VDDUV+ = 2.10–2.25 V). If VDD1 powers up before VDD2, outputs remain in high-impedance or fail-safe default state until VDD2 exceeds UVLO threshold. The device guarantees correct state recovery within 0.3 ms after both supplies stabilize-no external reset sequencing required.
What is the purpose of the HF XMTR and HF RCVR markings on the SI86SS51EC-IS1R pinout diagram?
The "HF XMTR" and "HF RCVR" labels on the SI86SS51EC-IS1R pinout indicate the internal high-frequency RF transmitter and receiver circuits associated with each isolated channel. These denote the underlying RF modulation architecture-not user-accessible pins-and confirm the absence of optical components or startup initialization routines in the device's operation.
SI86SS51EC-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:
- 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
SI86SS51EC-IS1R FAQ
1.How can I place an order for SI86SS51EC-IS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SS51EC-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 SI86SS51EC-IS1R reliable?
The price and inventory of SI86SS51EC-IS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SS51EC-IS1R is usually 5 days.
3.What payment methods are accepted for SI86SS51EC-IS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SS51EC-IS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SS51EC-IS1R?
SI86SS51EC-IS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SS51EC-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 SI86SS51EC-IS1R?
For technical support, including SI86SS51EC-IS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SS51EC-IS1R requirements.
6.How does Aetrix verify that SI86SS51EC-IS1R is sourced from the original manufacturer or authorized distributors?
All SI86SS51EC-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 SI86SS51EC-IS1R meets industry standards.
7.What is the process for return or replacement of SI86SS51EC-IS1R?
All SI86SS51EC-IS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI86SS51EC-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 SI86SS51EC-IS1R part is unused and in its original packaging.
Return procedure for SI86SS51EC-IS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SS51EC-IS1R Tags
-
ISO1212DBQR
Texas Instruments
-
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
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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