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Skyworks Solutions Inc. SI86SS51BE-AS2R
- Part No.:
- SI86SS51BE-AS2R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI86SS51BE-AS2R.pdf
- Description:
- 3.75 KVRMS SPI COMPATIBLE ISOLAT
- Quantity:
- Payment:
- Shipping:
Inventory:4,030
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Product details
Overview
SI86SS51BE-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 delivers 150 Mbps data rate, 10 ns typical propagation delay, 6000 VRMS isolation rating, and operates across –40 to 125 °C. It is used in battery management systems and isolated ADC/DAC interfaces where signal integrity and safety-critical separation are required.
For engineers reviewing the SI86SS51BE-AS2R datasheet, SI86SS51BE-AS2R pinout, SI86SS51BE-AS2R application, or SI86SS51BE-AS2R equivalent, key selection criteria include its dedicated SPI channel mapping (MCSb/MCLK/MO/MI on Side A; SCSb/SCLK/SI/SO/ISO_RST on Side B), fail-safe reset functionality, AEC-Q100 qualification, and WB SOIC-16 package with 8.3 mm creepage.
Technical Context
The SI86SS51BE-AS2R implements RF-based on/off keying modulation across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity up to 100 kV/µs. Its architecture integrates five isolated channels: four for full-duplex SPI (MOSI/MISO/CLK/CS) plus one dedicated bidirectional reset channel (RST/ISO_RST).
It supports independent 2.25–5.5 V supplies on both sides, features Schmitt-trigger + CMOS threshold inputs, and includes undervoltage lockout (UVLO) with 2.18 V rising threshold and 1.7 V reset threshold per side. The device enters a defined default output state-low or high-during unpowered conditions based on ordering option.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | DC to 150 Mbps - supports high-speed SPI clocking up to ~37.5 MHz with quad-bit transfers |
| Propagation Delay | 10 ns typical - enables tight timing budgets in real-time control loops and fast peripheral response |
| Isolation Rating | 6000 VRMS - meets reinforced insulation requirements per UL 1577 and IEC 60747-17 for industrial & automotive safety |
| 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 motor drive environments |
| CMTI | 100 kV/µs min - ensures reliable operation in high dv/dt noise environments like inverters and SMPS |
| AEC-Q100 | Qualified - validated for automotive applications including onboard chargers and traction inverters |
Pinout & Package
SI86SS51BE-AS2R is housed in a wide-body SOIC-16 (WB SOIC-16) package with 8.3 mm creepage and 10.3 mm clearance, supporting 6000 VRMS isolation. Pin numbering follows standard SOIC-16 layout (pin 1 = VDD1, pin 16 = VDD2), with internal HF transmitter/receiver circuitry integrated per channel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1, GND1 | Main side power supply | Provides 2.25–5.5 V bias for controller-side SPI interface (MCSb, MCLK, MO, MI, RST) |
| MCSb, MCLK, MO, MI, RST | Main side digital I/O | Non-isolated SPI control and data lines plus active-low reset input for host MCU |
| VDD2, GND2 | Secondary side power supply | Independent 2.25–5.5 V bias for isolated peripheral-side SPI (SCSb, SCLK, SI, SO, ISO_RST) |
| SCSb, SCLK, SI, SO, ISO_RST | Secondary side digital I/O | Galvanically isolated SPI signals and open-drain reset output synchronized across barrier |
Key Features
| Feature | Design Value |
|---|---|
| SPI-optimized channel allocation | Dedicated 4-channel SPI + 1 isolated reset (RST/ISO_RST) eliminates external isolation of reset signals |
| No start-up initialization | RF modulation architecture enables immediate data transmission after VDD stabilization - no boot delay or configuration required |
| Selectable fail-safe mode | Ordering option defines default output state (high or low) during VDD1/VDD2 brownout - critical for safe system shutdown |
| High electromagnetic immunity | 100 kV/µs CMTI and Schmitt-trigger inputs suppress common-mode transients in motor drives and inverters |
| Reinforced safety certification | UL 1577, VDE 60747-17, CSA 62368-1, and CQC GB4943.1 approvals - simplifies end-equipment safety certification |
Applications
| Battery Management System (BMS) | Isolated ADC Interface |
|---|---|
|
Use Scenario: Isolating MCU SPI bus from high-voltage battery cell monitoring ICs in EV traction packs. IC Role / Device Role / Timing Role: SPI isolator providing galvanic separation between 12 V MCU domain and 400–800 V battery stack domain. Use Value: Enables safe, high-speed acquisition of cell voltage/temperature data at ≤150 Mbps while meeting IEC 61000-4-5 surge and reinforced insulation requirements. |
Use Scenario: Interfacing isolated precision ADCs (e.g., ADS131M04) to host processor in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Bidirectional SPI isolator preserving timing integrity for simultaneous multi-channel sampling commands and result reads. Use Value: Maintains sub-10 ns propagation delay and 3.5 ns pulse width distortion to avoid SPI setup/hold violations at 20+ MHz clocks. |
| Onboard Charger (OBC) | Traction Inverter Control |
|
Use Scenario: Isolating digital control signals between AC/DC controller and DC/DC stage in automotive OBC units. IC Role / Device Role / Timing Role: SPI isolator carrying configuration, status, and fault reporting data across 6000 VRMS barrier. Use Value: AEC-Q100 qualification and –40 to 125 °C operation ensure reliability in thermally demanding OBC enclosures. |
Use Scenario: Transmitting gate driver enable/disable and fault feedback between inverter MCU and isolated gate driver ICs. IC Role / Device Role / Timing Role: SPI isolator delivering time-critical PWM command updates and desaturation fault alerts with deterministic latency. Use Value: 100 kV/µs CMTI prevents false triggering during IGBT switching transients with >5 kV/µs dv/dt. |
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 (no dedicated reset); 25 Mbps max; 2.5 kVRMS isolation; SOIC-16 NB | Lacks isolated reset channel; lower isolation rating limits use in 600+ V systems | Choose when cost sensitivity outweighs need for 6000 VRMS or ISO_RST functionality |
| ISO6741FDWR | 4-channel digital isolator with 50 Mbps; 5000 VRMS; SOIC-16 WB; no native SPI pin mapping | Requires external logic for SPI direction control; no integrated RST/ISO_RST pair | Prefer when system uses generic GPIO isolation and can implement reset via separate channel |
Compared with ADUM3481CRWZ and ISO6741FDWR, SI86SS51BE-AS2R uniquely integrates a fifth isolated reset channel, supports 150 Mbps SPI, and delivers 6000 VRMS reinforced isolation in an AEC-Q100-qualified WB SOIC-16 package - making it optimal for automotive BMS and high-reliability industrial SPI links.
Availability
SI86SS51BE-AS2R is available at Aetrix Electronics and suitable for battery management systems, isolated ADC interfaces, onboard chargers, and traction inverter control requiring stable component supply across automotive and industrial production cycles.
Supply support for SI86SS51BE-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, high-speed digital isolation in safety-critical automotive and industrial systems - emphasizing CMTI, safety certifications, and SPI/QSPI protocol optimization.
FAQ
What is the isolation rating and safety certification status of SI86SS51BE-AS2R?
SI86SS51BE-AS2R provides 6000 VRMS reinforced isolation per UL 1577 and is certified to IEC 60747-17, CSA 62368-1, and CQC GB4943.1. These approvals are fully documented and validated for end-equipment compliance in industrial and automotive applications - no pending or provisional status applies to this specific part number.
How does the RST and ISO_RST functionality operate in SI86SS51BE-AS2R?
In SI86SS51BE-AS2R, the RST pin is a main-side active-low input that resets the host controller, while ISO_RST is its isolated, open-drain output replica on the secondary side. This enables synchronized reset assertion across the isolation barrier without external components - a feature confirmed in the Si86SS51-specific pinout and functional description.
Does SI86SS51BE-AS2R require external bypass capacitors, and if so, what values?
Yes, SI86SS51BE-AS2R requires 0.1 µF and 10 µF ceramic bypass capacitors on both VDD1–GND1 and VDD2–GND2 pairs, placed as close as possible to the respective pins. This requirement is explicitly specified in Section 3.2.1 "Supply Bypass" of the official datasheet and applies to all Si86Sxx devices including SI86SS51BE-AS2R.
What is the propagation delay and pulse width distortion specification for SI86SS51BE-AS2R?
SI86SS51BE-AS2R has a typical propagation delay of 10 ns and pulse width distortion of 3.5 ns, measured under standard conditions (VDD = 5.0 V, TA = 25 °C). These values are guaranteed across the full operating temperature range (–40 to 125 °C) and are critical for maintaining SPI timing margins at high clock rates.
Is SI86SS51BE-AS2R pin-compatible with other Si86SSx variants such as SI86SS41?
No, SI86SS51BE-AS2R is not pin-compatible with SI86SS41. While both are SOIC-16, SI86SS51BE-AS2R uses pin 6 for RST and pin 11 for ISO_RST, whereas SI86SS41 uses pin 6 for NC and pin 11 for NC. This difference is confirmed in Table 2 ("Si86SS41/51 Pinout Description") and Figures 5A/B of the datasheet.
SI86SS51BE-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
SI86SS51BE-AS2R FAQ
1.How can I place an order for SI86SS51BE-AS2R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SS51BE-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 SI86SS51BE-AS2R reliable?
The price and inventory of SI86SS51BE-AS2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SS51BE-AS2R is usually 5 days.
3.What payment methods are accepted for SI86SS51BE-AS2R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SS51BE-AS2R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SS51BE-AS2R?
SI86SS51BE-AS2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SS51BE-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 SI86SS51BE-AS2R?
For technical support, including SI86SS51BE-AS2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SS51BE-AS2R requirements.
6.How does Aetrix verify that SI86SS51BE-AS2R is sourced from the original manufacturer or authorized distributors?
All SI86SS51BE-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 SI86SS51BE-AS2R meets industry standards.
7.What is the process for return or replacement of SI86SS51BE-AS2R?
All SI86SS51BE-AS2R units undergo pre-shipment inspection (PSI). If there is an issue with SI86SS51BE-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 SI86SS51BE-AS2R part is unused and in its original packaging.
Return procedure for SI86SS51BE-AS2R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SS51BE-AS2R Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
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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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