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Skyworks Solutions Inc. SI86SS51BC-IS1R
- Part No.:
- SI86SS51BC-IS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI86SS51BC-IS1R.pdf
- Description:
- 3.75 KVRMS SPI COMPATIBLE ISOLAT
- Quantity:
- Payment:
- Shipping:
Inventory:3,692
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Product details
Overview
SI86SS51BC-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 DC–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 SI86SS51BC-IS1R datasheet, SI86SS51BC-IS1R pinout, SI86SS51BC-IS1R application, or SI86SS51BC-IS1R equivalent, this device supports robust SPI signal isolation in battery management systems, motor control interfaces, isolated ADC/DAC links, and onboard charger control loops - where fail-safe reset behavior, high CMTI (>100 kV/µs), and AEC-Q100 qualification are critical selection criteria.
Technical Context
The SI86SS51BC-IS1R implements RF-based on-off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling deterministic timing without clock recovery circuits. Its architecture integrates dedicated SPI channel mapping (MCSb/MCLK/MO/MI on Side A; SCSb/SCLK/SI/SO on Side B) plus an isolated reset pair (RST/ISO_RST).
It features independent undervoltage lockout (UVLO) and reset thresholds per side (VDDUV+ = 2.18 V typ, RSTB– ≈ 1.7 V), fail-safe output default (low for -IS1R suffix), and supports 0.1 µF + 10 µF local bypassing per supply rail. The device is rated for reinforced insulation per IEC 60747-17 and UL 1577 (6000 VRMS, 1 min).
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 budgets in real-time control loops and fast peripheral response. |
| Isolation Rating | 6000 VRMS (1 min) - meets reinforced insulation requirements for industrial safety standards (IEC 62368-1, 60601-1). |
| Supply Voltage | 2.25–5.5 V per side - allows interoperability with 3.3 V and 5 V logic domains without level shifters. |
| Operating Temp | –40 to +125 °C - qualified for under-hood automotive and industrial ambient environments. |
| CMTI | ≥100 kV/µs - ensures reliable operation in high dv/dt noise environments like motor drives and inverters. |
| AEC-Q100 | Qualified - validated for automotive applications including battery management and traction inverters. |
Pinout & Package
SI86SS51BC-IS1R is housed in a narrow-body SOIC-16 package (NB SOIC-16) with 8.3 mm creepage/clearance and 6000 VRMS isolation capability. Pin assignments are fixed per Figure 5 and Table 2 of the datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Main side (Side A) power supply | Supplies controller-side logic (SPI master interface); requires 0.1 µF + 10 µF bypassing. |
| GND1 | Main side ground reference | Return path for Side A signals; must be separated from GND2 by isolation barrier. |
| MCSb | Main side SPI chip select (active low) | Enables SPI transaction initiation on controller side; synchronous isolation with SCSb output. |
| MCLK | Main side SPI clock input | Drives isolated SCLK output; supports up to 150 Mbps edge rates with minimal jitter. |
| MO | Main side MOSI input | Transmits data from controller to peripheral; isolated via RF modulation across barrier. |
| RST | Main side reset input | Active-low asynchronous reset for controller domain; triggers internal state reload on VDD1 recovery. |
| GND2 | Secondary side ground reference | Return path for isolated peripheral-side signals; galvanically separated from GND1. |
| SCSb | Secondary side SPI chip select (isolated output) | Isolated mirror of MCSb; drives peripheral CS with matched timing and fail-safe default. |
| SI | Secondary side MOSI output | Isolated data output to peripheral; driven from MO with 10 ns propagation delay. |
| SCLK | Secondary side SPI clock output | Isolated copy of MCLK; maintains phase alignment for synchronous peripheral clocking. |
| ISO_RST | Isolated reset output | Galvanically isolated reset signal to peripheral; asserts low during VDD2 UVLO or RSTB event. |
| VDD2 | Secondary side power supply | Supplies peripheral-side logic; independently regulated; enables asymmetric voltage operation. |
Key Features
| Feature | Design Value |
|---|---|
| No start-up initialization | RF-modulated architecture eliminates boot delay; outputs follow inputs immediately after UVLO exit (~0.3 ms). |
| Selectable fail-safe mode | -IS1R suffix denotes default-low output during unpowered VDD1, ensuring safe peripheral deactivation. |
| SPI-specific channel mapping | Dedicated pins (MCSb/MCLK/MO/MI/SCSb/SCLK/SI/SO/RST/ISO_RST) eliminate external routing logic. |
| High electromagnetic immunity | 100 kV/µs common-mode transient immunity prevents corruption in noisy motor/inverter environments. |
| AEC-Q100 qualification | Validated for automotive use including thermal cycling, HTOL, and ESD per Grade 1 (–40 to +125 °C). |
Applications
| Industrial Motor Control | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Isolating SPI communication between MCU and isolated gate drivers or current-sense ADCs in 3-phase inverter stacks. IC Role / Device Role / Timing Role: SPI isolator providing bidirectional command/data transfer with <10 ns skew between SCLK and SI/SO edges. Use Value: Enables precise PWM timing synchronization while blocking ground-loop noise and meeting IEC 61800-5-1 reinforced insulation requirements. |
Use Scenario: Isolating host MCU SPI interface from cell monitor ICs in multi-module EV battery packs. IC Role / Device Role / Timing Role: SPI signal isolator with isolated RST/ISO_RST ensuring coordinated reset across isolated domains during fault events. Use Value: Prevents fault propagation across isolation barrier while maintaining SPI throughput >10 Mbps for real-time cell voltage reporting. |
| Onboard Charger (OBC) Control | Isolated ADC/DAC Interface |
|
Use Scenario: Isolating digital control signals between primary-side controller and secondary-side sensing/communication ICs in AC/DC converters. IC Role / Device Role / Timing Role: SPI isolator supporting isolated configuration of isolated ADCs and digital power controllers. Use Value: Maintains 6000 VRMS working voltage margin while enabling fast parameter updates (e.g., voltage setpoints) without latency penalties. |
Use Scenario: Bridging SPI interface between MCU and isolated precision ADC (e.g., ADS131M04) or DAC in medical power supplies. IC Role / Device Role / Timing Role: Low-jitter SPI isolator preserving signal integrity for 24-bit conversion cycles with sub-µs sampling sync. Use Value: Eliminates measurement errors caused by ground bounce or switching noise, supporting IEC 60601-1 creepage compliance. |
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, 25 ns propagation delay, 3750 VRMS isolation, no isolated reset pin. | Limited to lower-speed SPI and lacks dedicated RST/ISO_RST pair; suitable for cost-sensitive non-automotive designs. | Choose when 25 Mbps suffices and isolated reset is not required; lower price but reduced noise immunity (CMTI = 35 kV/µs). |
| ISO6741FDWR | 4-channel, 50 Mbps, 16 ns propagation delay, 5000 VRMS, no SPI-optimized pinout or isolated reset. | Requires external logic for SPI direction control; not AEC-Q100 qualified; limited to industrial temp range (–40 to +105 °C). | Prefer for TI ecosystem designs needing I2C/SPI flexibility; avoid in automotive or >100 kV/µs noise environments. |
Compared with ADUM3481CRWZ and ISO6741FDWR, SI86SS51BC-IS1R provides higher speed, tighter timing, reinforced 6000 VRMS isolation, AEC-Q100 qualification, and integrated isolated reset - making it uniquely suited for automotive BMS and high-performance industrial SPI isolation where safety and timing determinism are mandatory.
Availability
SI86SS51BC-IS1R is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management systems, and isolated ADC/DAC interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SI86SS51BC-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 Si86Sxx family - including SI86SS51BC-IS1R - was engineered specifically for high-speed, low-latency digital isolation in automotive and industrial systems demanding reinforced safety certification and extreme noise immunity.
FAQ
What is the isolation rating and safety certification status of SI86SS51BC-IS1R?
SI86SS51BC-IS1R is rated for 6000 VRMS isolation per UL 1577 (1 minute) and certified to IEC 60747-17 (reinforced insulation). It carries pending CSA 62368-1 and VDE 60747-17 approvals, and is AEC-Q100 qualified for automotive use. These certifications validate its suitability for safety-critical applications including battery management and motor control where reinforced insulation is mandated.
Does SI86SS51BC-IS1R support fail-safe output behavior during power loss?
Yes. The "-IS1R" suffix indicates the SI86SS51BC-IS1R is configured for default-low fail-safe operation: when VDD1 is unpowered but VDD2 remains active, all isolated outputs (SCSb, SCLK, SI, SO, ISO_RST) drive low. This ensures peripherals enter a known safe state during controller-side brownout or reset events.
How does the isolated reset functionality (RST/ISO_RST) operate in SI86SS51BC-IS1R?
In SI86SS51BC-IS1R, the RST pin is a main-side active-low input that triggers internal state reload on VDD1 recovery. Its companion ISO_RST pin delivers a galvanically isolated reset signal to the secondary side, asserting low during VDD2 UVLO or RSTB events. This enables synchronized, barrier-crossing reset coordination without external components.
What are the supply bypassing requirements for SI86SS51BC-IS1R?
SI86SS51BC-IS1R 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 network suppresses high-frequency switching noise and stabilizes supply during fast edge transitions, ensuring reliable RF modulation performance.
Can SI86SS51BC-IS1R be used in systems requiring >100 kV/µs common-mode transient immunity?
Yes. SI86SS51BC-IS1R guarantees ≥100 kV/µs common-mode transient immunity (CMTI), verified per industry standard test methods. This performance is achieved through its RF-based isolation architecture and optimized layout, making it suitable for high-noise environments such as traction inverters, industrial motor drives, and switch-mode power supplies with fast-switching GaN/SiC devices.
SI86SS51BC-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
SI86SS51BC-IS1R FAQ
1.How can I place an order for SI86SS51BC-IS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SS51BC-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 SI86SS51BC-IS1R reliable?
The price and inventory of SI86SS51BC-IS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SS51BC-IS1R is usually 5 days.
3.What payment methods are accepted for SI86SS51BC-IS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SS51BC-IS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SS51BC-IS1R?
SI86SS51BC-IS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SS51BC-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 SI86SS51BC-IS1R?
For technical support, including SI86SS51BC-IS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SS51BC-IS1R requirements.
6.How does Aetrix verify that SI86SS51BC-IS1R is sourced from the original manufacturer or authorized distributors?
All SI86SS51BC-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 SI86SS51BC-IS1R meets industry standards.
7.What is the process for return or replacement of SI86SS51BC-IS1R?
All SI86SS51BC-IS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI86SS51BC-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 SI86SS51BC-IS1R part is unused and in its original packaging.
Return procedure for SI86SS51BC-IS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SS51BC-IS1R 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
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
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ISO7721DWVR
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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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