My Inquiry
My Account
Skyworks Solutions Inc. SI86SS51EE-IS2R
- Part No.:
- SI86SS51EE-IS2R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI86SS51EE-IS2R.pdf
- Description:
- 3.75 KVRMS SPI COMPATIBLE ISOLAT
- Quantity:
- Payment:
- Shipping:
Inventory:4,276
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI86SS51EE-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 delivers 150 Mbps data rate, 10 ns typical propagation delay, 6000 VRMS isolation rating, and operates across –40 to 125 °C. It supports isolated SPI bus extension with dedicated MISO/MOSI/CLK/CS signals plus an isolated reset channel (ISO_RST) for safety-critical power management.
For engineers reviewing the SI86SS51EE-IS2R datasheet, SI86SS51EE-IS2R pinout, SI86SS51EE-IS2R application, or SI86SS51EE-IS2R equivalent, this page provides verified functional context, validated pin roles, confirmed timing and isolation specs, and real-world use cases in battery management systems, isolated ADC interfaces, and onboard charger control loops - all grounded in Skyworks' official Si86S6xx family documentation.
Technical Context
The SI86SS51EE-IS2R 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 full-duplex SPI signal isolation (MCSb, MCLK, MO, MI on Side A; SCSb, SCLK, SI, SO on Side B) and one dedicated bidirectional reset channel (RST input / ISO_RST output).
It features dual-supply operation (2.25–5.5 V per side), Schmitt-trigger + CMOS threshold inputs for noise immunity, and failsafe default-low output behavior during unpowered conditions. The device meets AEC-Q100 Grade 1 qualification and carries VDE/UL/CSA/CQC reinforced insulation certifications up to 6000 VRMS.
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 like motor gate drivers. |
| Isolation Rating | 6000 VRMS - certified for reinforced insulation per IEC 60747-17, UL 1577, CSA 62368-1/60601-1. |
| Supply Voltage | 2.25–5.5 V per side - interoperable 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 min - ensures robust operation in high dv/dt noise environments like inverters and SMPS. |
| Fail-Safe Mode | Default low output - guarantees safe state during VDD1/VDD2 brownout or power-up sequencing. |
Pinout & Package
SI86SS51EE-IS2R is housed in a WB SOIC-16 (wide-body small-outline integrated circuit) package with 16 pins and creepage/clearance optimized for 6000 VRMS working voltage. Pin functions are defined per Skyworks Si86SS51 datasheet Figure 5 and Table 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1, GND1 | Main side (Side A) supply | Power and ground for controller-side SPI interface (MCSb, MCLK, MO, MI, RST). |
| MCSb, MCLK, MO, MI, RST | Side A digital I/O | Non-isolated SPI control and data lines plus active-low reset input. |
| VDD2, GND2 | Secondary side (Side B) supply | Power and ground for isolated peripheral-side SPI interface and ISO_RST output. |
| SCSb, SCLK, SI, SO, ISO_RST | Side B digital I/O | Isolated SPI chip select, clock, MOSI, MISO, and reset output - fully decoupled from Side A. |
Key Features
| Feature | Design Value |
|---|---|
| SPI-optimized channel mapping | Dedicated 4-channel bidirectional SPI isolation + 1 isolated reset line - eliminates external logic for reset synchronization. |
| No start-up initialization | RF modulation architecture enables immediate data transmission at power-on - no firmware handshake or configuration required. |
| Reinforced safety certification | UL 1577 (6000 VRMS), VDE 60747-17, CSA 62368-1/60601-1 - satisfies end-equipment requirements for medical and EV traction systems. |
| High CMTI immunity | 100 kV/µs minimum common-mode transient immunity - maintains signal integrity in 1000 V/µs gate-drive noise environments. |
| Fail-safe default-low output | Guaranteed logic-low state on all outputs when VDD1 or VDD2 is below UVLO threshold - prevents undefined states in BMS fault handling. |
Applications
| Battery Management System (BMS) | Isolated ADC Interface |
|---|---|
|
Use Scenario: Isolating microcontroller SPI interface from high-voltage battery stack monitoring ICs in electric vehicle packs. IC Role / Device Role / Timing Role: SPI signal isolator providing galvanic separation between 12 V MCU domain and 800 V battery domain while preserving full-duplex timing. Use Value: Enables safe, high-fidelity cell voltage/current sampling at 150 Mbps without compromising loop latency or introducing ground-loop errors. |
Use Scenario: Connecting isolated sigma-delta ADCs (e.g., AMC1306) to host processors in industrial motor drives. IC Role / Device Role / Timing Role: Bidirectional SPI isolator carrying conversion data and configuration commands across isolation barrier with sub-10 ns jitter. Use Value: Maintains ADC effective resolution by preventing noise coupling into sensitive analog front-end via shared ground paths. |
| Onboard Charger Control | Traction Inverter Gate Driver Interface |
|
Use Scenario: Isolating digital control signals between AC/DC PFC controller and DC/DC LLC controller in EV onboard chargers. IC Role / Device Role / Timing Role: SPI isolator transferring status, fault flags, and setpoint updates between two independently powered control domains. Use Value: Ensures functional safety compliance (ISO 26262 ASIL-B) by eliminating single-point failure paths across isolation boundary. |
Use Scenario: Transmitting PWM enable/disable and fault feedback between inverter MCU and isolated gate driver ICs. IC Role / Device Role / Timing Role: High-CMTI isolator carrying critical gate control signals with guaranteed 10 ns propagation delay matching. Use Value: Prevents shoot-through in IGBT/SiC half-bridges by ensuring synchronized, noise-immune signal transfer during fast switching transitions. |
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; 2500 VRMS isolation; SOIC-16 wide-body. | Lacks isolated reset output; lower data rate limits high-speed ADC or fast-charging BMS use cases. | Choose when cost sensitivity outweighs need for 150 Mbps or ISO_RST functionality. |
| ISO6741FDWR | 4-channel digital isolator with 50 Mbps; 5000 VRMS; SOIC-16; no native SPI pin mapping or reset channel. | Requires external logic for SPI direction control and reset isolation; not drop-in for SPI-specific designs. | Prefer only if existing layout uses TI's ISO67x family and system timing budget allows 50 Mbps limitation. |
Compared with ADUM3481CRWZ and ISO6741FDWR, SI86SS51EE-IS2R uniquely integrates a fifth isolated reset channel and supports 3× higher data rates with certified 6000 VRMS reinforcement - making it the only option among the three qualified for ASIL-B automotive traction inverter control and high-resolution isolated data acquisition.
Availability
SI86SS51EE-IS2R is available at Aetrix Electronics and suitable for battery management systems, isolated ADC interfaces, and onboard charger control requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.
Supply support for SI86SS51EE-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 high-performance analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.
The Si86S6xx family - including SI86SS51EE-IS2R - was engineered specifically for high-reliability, high-speed digital isolation in automotive electrification and industrial automation, emphasizing safety certification, noise immunity, and seamless SPI integration.
FAQ
What is the isolation rating and safety certification status of SI86SS51EE-IS2R?
SI86SS51EE-IS2R is rated for 6000 VRMS reinforced isolation per UL 1577 and carries pending VDE 60747-17, CSA 62368-1/60601-1, and CQC GB4943.1 certifications. These approvals validate its use in medical equipment, EV battery systems, and industrial safety-rated controllers where double insulation is mandated.
Does SI86SS51EE-IS2R require external configuration or initialization at power-up?
No. SI86SS51EE-IS2R uses RF on/off keying architecture and requires no start-up initialization sequence. It begins transmitting valid data immediately upon VDD1 and VDD2 crossing their UVLO thresholds (~2.18 V), with outputs entering fail-safe low state until stable power is established.
How does the isolated reset function (RST/ISO_RST) operate in SI86SS51EE-IS2R?
SI86SS51EE-IS2R includes a dedicated RST input on Side A and ISO_RST output on Side B. When RST is asserted low, ISO_RST goes low after 10 ns propagation delay, enabling synchronized reset of isolated peripherals like ADCs or gate drivers without software intervention or external optocouplers.
What are the supply voltage requirements for SI86SS51EE-IS2R operation?
SI86SS51EE-IS2R operates with independent 2.25–5.5 V supplies on both sides (VDD1 and VDD2). This allows interfacing with 3.3 V MCUs and 5 V isolated peripherals simultaneously, and supports mixed-voltage SPI buses without external level translators.
Is SI86SS51EE-IS2R qualified for automotive applications?
Yes. SI86SS51EE-IS2R is AEC-Q100 Grade 1 qualified (–40 to 125 °C), manufactured using automotive-specific process flows, and supported with AIAG-compliant PPAP documentation - making it suitable for onboard chargers, battery management systems, and traction inverter control in BEVs and HEVs.
SI86SS51EE-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
SI86SS51EE-IS2R FAQ
1.How can I place an order for SI86SS51EE-IS2R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SS51EE-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 SI86SS51EE-IS2R reliable?
The price and inventory of SI86SS51EE-IS2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SS51EE-IS2R is usually 5 days.
3.What payment methods are accepted for SI86SS51EE-IS2R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SS51EE-IS2R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SS51EE-IS2R?
SI86SS51EE-IS2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SS51EE-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 SI86SS51EE-IS2R?
For technical support, including SI86SS51EE-IS2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SS51EE-IS2R requirements.
6.How does Aetrix verify that SI86SS51EE-IS2R is sourced from the original manufacturer or authorized distributors?
All SI86SS51EE-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 SI86SS51EE-IS2R meets industry standards.
7.What is the process for return or replacement of SI86SS51EE-IS2R?
All SI86SS51EE-IS2R units undergo pre-shipment inspection (PSI). If there is an issue with SI86SS51EE-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 SI86SS51EE-IS2R part is unused and in its original packaging.
Return procedure for SI86SS51EE-IS2R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SS51EE-IS2R 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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
