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Skyworks Solutions Inc. SI86SQ44BB-AUR
- Part No.:
- SI86SQ44BB-AUR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI86SQ44BB-AUR.pdf
- Description:
- 2.5 KVRMS QSPI COMPATIBLE ISOLAT
- Quantity:
- Payment:
- Shipping:
Inventory:3,389
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Product details
Overview
SI86SQ44BB-AUR from Skyworks Solutions is a 5-channel, bidirectional QSPI digital isolator with reinforced 6000 VRMS isolation, 150 Mbps data rate, and configurable channel direction via DIR/ISO_DIR pins. It operates across 2.25–5.5 V supplies and supports industrial and automotive systems requiring isolated high-speed serial bus interfaces.
For engineers reviewing the SI86SQ44BB-AUR datasheet, SI86SQ44BB-AUR pinout, SI86SQ44BB-AUR application, or SI86SQ44BB-AUR equivalent, this device delivers precise timing (10 ns propagation delay), fail-safe output control, and robust noise immunity (100 kV/µs CMTI) for QSPI memory interface isolation in battery management and motor control designs.
Technical Context
The SI86SQ44BB-AUR implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling deterministic signal transfer without clock recovery. Its architecture integrates four reversible I/O channels and one dedicated forward-direction DIR input with isolated ISO_DIR output.
Direction control is managed by the DIR pin on Side A, which configures all four data channels simultaneously for A→B or B→A flow; EN_A and EN_B provide independent tristate enable per side. The device supports fail-safe default-high or default-low outputs during unpowered conditions and includes undervoltage lockout (UVLO) with 2.18 V rising threshold and 131 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports full-speed QSPI memory read/write cycles without protocol translation. |
| Isolation rating | 6000 VRMS - meets reinforced insulation requirements per UL 1577 and IEC 60747-17 for safety-critical systems. |
| Propagation delay | 10 ns typical - enables tight timing budgets in high-frequency digital interfaces like QSPI clock domains. |
| Supply voltage | 2.25–5.5 V per side - allows interoperability with 3.3 V and 5 V logic families on both isolated sides. |
| CMTI | ≥100 kV/µs - ensures reliable operation in noisy motor drive and inverter environments with fast dv/dt transients. |
| Operating temperature | –40 to +125 °C - qualified for under-hood automotive and industrial ambient conditions. |
| Fail-safe mode | Selectable default-high or default-low output - prevents undefined states during power sequencing in BMS and OBC applications. |
Pinout & Package
SI86SQ44BB-AUR is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance), supporting 6000 VRMS isolation. Pin assignments are validated per Figure 6 and Table 3 of Skyworks datasheet 206553B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1, VDD2 | Side A / Side B supply | Independent 2.25–5.5 V rails; require 0.1 µF + 10 µF bypass capacitors per side for stable RF modulation. |
| GND1, GND2 | Side A / Side B ground | Galvanically separated reference planes; must not be shorted to maintain isolation integrity. |
| A1–A4, B1–B4 | Reversible I/O channels | Four bidirectional data lines; direction set globally by DIR pin - no per-channel direction registers needed. |
| DIR | Direction control input | Active-high signal on Side A that configures all four channels for A→B (H) or B→A (L) flow. |
| ISO_DIR | Isolated direction status | Provides synchronized copy of DIR state on Side B for coordinated peripheral-side logic decisions. |
| EN_A, EN_B | Side-enable inputs | Active-high enables transmitter/receiver circuits per side; low state forces outputs to high-impedance. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation | Eliminates LED aging and temperature drift issues of optocouplers; achieves 10 ns propagation delay with no start-up delay. |
| Configurable QSPI direction | Single DIR pin controls all four data channels, simplifying PCB routing and firmware for bidirectional flash memory access. |
| Reinforced safety certification | UL 1577 (6000 VRMS), VDE 60747-17, CSA 62368-1, and CQC GB4943.1 - enables direct use in medical and EV traction systems. |
| High-noise immunity | 100 kV/µs common-mode transient immunity and Schmitt-trigger inputs reject >36 ns glitches without external filtering. |
| Fail-safe output control | Ordering option selects default-high or default-low output state during VDD undervoltage, preventing undefined MCU communication. |
Applications
| Industrial Motor Control | Automotive Battery Management |
|---|---|
|
Use Scenario: Isolating QSPI interface between MCU and isolated flash memory in servo drive controllers. IC Role / Device Role / Timing Role: Bidirectional QSPI isolator providing direction-controlled data path with 10 ns timing precision. Use Value: Enables secure firmware updates and parameter storage across isolation barrier while maintaining real-time control loop timing. |
Use Scenario: Isolating QSPI communication between battery controller MCU and isolated cell monitoring ICs in EV packs. IC Role / Device Role / Timing Role: Direction-configurable isolator supporting both configuration writes and telemetry reads over shared bus. Use Value: Reduces component count vs. discrete isolators; eliminates need for separate direction-control logic in BMS stack. |
| Onboard Charger (OBC) | Medical Imaging Power Supply |
|
Use Scenario: Isolating QSPI-connected configuration EEPROM in 11 kW AC/DC OBC modules with reinforced insulation. IC Role / Device Role / Timing Role: Safety-certified QSPI isolator handling bidirectional memory access across 6000 VRMS barrier. Use Value: Meets IEC 62368-1 reinforced insulation requirements while supporting fast boot-time memory reads. |
Use Scenario: Isolating QSPI interface between imaging system host processor and isolated high-voltage power module firmware memory. IC Role / Device Role / Timing Role: High-CMTI isolator ensuring reliable memory access in MRI/X-ray power supplies with fast switching noise. Use Value: Prevents data corruption during 100 kV/µs transients generated by SiC-based HV inverters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar QSPI isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6401ARWZ | 4-channel, fixed-direction isolator; no DIR pin or QSPI-specific configuration; 50 Mbps max data rate. | Lacks bidirectional channel control; requires external logic for QSPI half-duplex direction management. | Choose when only unidirectional isolation is needed and lower speed suffices. |
| ISO6741QDWR | 4-channel, fixed-direction isolator; 50 Mbps; no integrated DIR/ISO_DIR; requires external direction control circuitry. | Not optimized for QSPI bus topology; adds layout complexity and timing uncertainty vs. SI86SQ44BB-AUR's native support. | Prefer for cost-sensitive, non-QSPI applications where direction is static and speed ≤50 Mbps. |
Compared with ADUM6401ARWZ and ISO6741QDWR, SI86SQ44BB-AUR uniquely integrates QSPI-aware direction control, 150 Mbps bandwidth, and reinforced 6000 VRMS isolation in a single WB SOIC-16 package-reducing BOM count and improving timing predictability in high-speed isolated memory interfaces.
Availability
SI86SQ44BB-AUR is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management systems, and medical power supply designs requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.
Supply support for SI86SQ44BB-AUR 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 Si86S6xx/Qxx family was designed specifically for high-reliability, high-speed digital isolation in automotive, industrial, and medical systems-emphasizing safety certification, noise immunity, and integration of protocol-aware features like QSPI direction control.
FAQ
What is the isolation voltage rating of the SI86SQ44BB-AUR?
The SI86SQ44BB-AUR provides reinforced 6000 VRMS isolation per UL 1577 for 1 minute, validated per IEC 60747-17 and certified by VDE, CSA, and CQC. This rating applies to the WB SOIC-16 package and supports safety-critical applications including automotive onboard chargers and medical power supplies.
How does the DIR pin function in the SI86SQ44BB-AUR?
The DIR pin on the SI86SQ44BB-AUR is a Side A input that globally configures all four bidirectional channels: high sets A→B flow, low sets B→A flow. Its state is replicated on the ISO_DIR output on Side B, enabling synchronized direction control across the isolation barrier without additional signaling lines.
Does the SI86SQ44BB-AUR require external startup initialization?
No, the SI86SQ44BB-AUR requires no startup initialization. Its RF-based modulation architecture enables immediate deterministic operation after VDD exceeds UVLO+ (2.18 V). Outputs follow inputs within 0.3 ms of power-up, with 100 kΩ weak pulldowns holding states low until stabilization.
What are the supply voltage requirements for SI86SQ44BB-AUR operation?
The SI86SQ44BB-AUR operates with independent 2.25–5.5 V supplies on both VDD1 (Side A) and VDD2 (Side B). Each side requires local 0.1 µF ceramic + 10 µF bulk bypass capacitors. Operation outside this range triggers undervoltage lockout, holding outputs in fail-safe state.
Is the SI86SQ44BB-AUR qualified for automotive applications?
Yes, the SI86SQ44BB-AUR is AEC-Q100 qualified and supports AIAG-compliant PPAP documentation. It is manufactured using automotive-specific process flows and includes IMDS/CAMDS compliance-making it suitable for onboard chargers, battery management systems, and traction inverter control modules.
SI86SQ44BB-AUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- SPI
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 4/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- 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-QSOP
SI86SQ44BB-AUR FAQ
1.How can I place an order for SI86SQ44BB-AUR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SQ44BB-AUR 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 SI86SQ44BB-AUR reliable?
The price and inventory of SI86SQ44BB-AUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SQ44BB-AUR is usually 5 days.
3.What payment methods are accepted for SI86SQ44BB-AUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SQ44BB-AUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SQ44BB-AUR?
SI86SQ44BB-AUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SQ44BB-AUR 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 SI86SQ44BB-AUR?
For technical support, including SI86SQ44BB-AUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SQ44BB-AUR requirements.
6.How does Aetrix verify that SI86SQ44BB-AUR is sourced from the original manufacturer or authorized distributors?
All SI86SQ44BB-AUR 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 SI86SQ44BB-AUR meets industry standards.
7.What is the process for return or replacement of SI86SQ44BB-AUR?
All SI86SQ44BB-AUR units undergo pre-shipment inspection (PSI). If there is an issue with SI86SQ44BB-AUR, 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 SI86SQ44BB-AUR part is unused and in its original packaging.
Return procedure for SI86SQ44BB-AUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SQ44BB-AUR 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
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
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ISO7721DWVR
Texas Instruments
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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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