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Skyworks Solutions Inc. SI86SQ44BB-IUR
- Part No.:
- SI86SQ44BB-IUR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI86SQ44BB-IUR.pdf
- Description:
- 2.5 KVRMS QSPI COMPATIBLE ISOLAT
- Quantity:
- Payment:
- Shipping:
Inventory:2,105
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Product details
Overview
SI86SQ44BB-IUR from Skyworks Solutions is a 5-channel reinforced digital isolator with bidirectional QSPI bus support, featuring 150 Mbps data rate, 10 ns propagation delay, and 6000 VRMS isolation rating. It implements direction-controlled reversible isolation for quad-SPI memory interfaces in battery management systems and traction inverters.
For engineers reviewing the SI86SQ44BB-IUR datasheet, SI86SQ44BB-IUR pinout, SI86SQ44BB-IUR application, or SI86SQ44BB-IUR equivalent, this device delivers verified QSPI-direction control, fail-safe output configuration, and AEC-Q100 qualification for automotive-grade isolated communication paths.
Technical Context
The SI86SQ44BB-IUR uses RF-based on/off keying across a semiconductor isolation barrier to achieve high noise immunity and eliminate startup initialization. Its architecture supports dynamic direction reversal via DIR/ISO_DIR pins, enabling half-duplex QSPI data line isolation without external logic.
It integrates independent undervoltage lockout (UVLO) and reset circuitry per side (VDD1/VDD2), with RSTB thresholds at ~1.7 V and UVLO hysteresis of 105–160 mV. The device operates across –40 °C to +125 °C with 2.25–5.5 V dual-supply flexibility and 100 kV/µs CMTI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | DC to 150 Mbps - supports full-speed QSPI memory read/write cycles without timing bottleneck |
| Propagation Delay | 10 ns typical - enables tight timing closure in high-frequency SPI clock domains up to 75 MHz |
| Isolation Rating | 6000 VRMS - meets reinforced insulation requirements per UL 1577 and IEC 60747-17 for EV traction inverters |
| Supply Voltage | 2.25–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V peripheral rails |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive applications including onboard chargers and BMS |
| CMTI | ≥100 kV/µs - ensures robust operation in high-dV/dt motor drive environments without signal corruption |
| Fail-Safe Mode | Selectable default-high or default-low outputs during unpowered state - prevents undefined logic states in safety-critical power-up sequences |
Pinout & Package
SI86SQ44BB-IUR 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, VDD2 | Side A / Side B supply | Dual independent 2.25–5.5 V supplies enable level-shifting between controller and peripheral domains |
| GND1, GND2 | Side A / Side B ground | Galvanically isolated grounds maintain >6 kVRMS barrier integrity and suppress ground-loop noise |
| A1–A4, B1–B4 | Reversible I/O channels | Four bidirectional data lines controlled by DIR pin - directly isolates QSPI IO0–IO3 signals |
| DIR | Direction control input | Active-high signal sets data flow direction (A→B or B→A); enables half-duplex QSPI bus reversal |
| ISO_DIR | Isolated direction status output | Provides isolated copy of DIR state to secondary side - synchronizes peripheral-side direction awareness |
| EN_A, EN_B | Side A / Side B output enable | Active-high enables transmitter/receiver; low places outputs in high-impedance - supports bus sharing |
Key Features
| Feature | Design Value |
|---|---|
| QSPI-direction control | Single DIR pin configures all four data channels simultaneously - eliminates discrete logic and reduces PCB footprint |
| Schmitt-trigger + CMOS inputs | 0.15 × VDD input hysteresis and 0.3/0.7 × VDD thresholds - rejects EMI-induced glitches in noisy motor-control environments |
| Tri-state outputs with enable | EN_A/EN_B pins place respective side outputs in Hi-Z - enables multi-master QSPI bus arbitration and shared peripheral access |
| AEC-Q100 Grade 0 qualification | Validated for operation at +125 °C ambient - meets automotive reliability requirements for traction inverters and OBCs |
| No start-up initialization | RF modulation architecture requires zero boot time - outputs become valid within 0.3 ms of VDD stabilization |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating QSPI interface between MCU and isolated cell monitoring ICs in high-voltage battery packs. IC Role / Device Role / Timing Role: Bidirectional QSPI data isolator with direction control for reading voltage/temperature telemetry from daisy-chained monitors. Use Value: Enables safe, high-speed memory-mapped access to distributed sensors while maintaining 6000 VRMS reinforcement across 800 V DC bus. |
Use Scenario: Isolating command and status signals between inverter gate driver ICs and main MCU in EV powertrain systems. IC Role / Device Role / Timing Role: Direction-configurable isolator for half-duplex feedback channels (e.g., fault reporting, temperature sensing) over QSPI-like protocol. Use Value: Supports real-time diagnostics with <10 ns timing skew, meeting ASIL-B timing constraints for functional safety monitoring. |
| Onboard Charger (OBC) | Industrial PLC I/O Module |
|
Use Scenario: Isolating firmware update interface between AC/DC controller and isolated MCU managing DC-DC conversion stages. IC Role / Device Role / Timing Role: Reversible QSPI isolator enabling secure bidirectional code download and verification across isolation barrier. Use Value: Eliminates need for separate forward/reverse isolators - reduces BOM count and layout complexity in space-constrained OBC designs. |
Use Scenario: Isolating high-speed serial configuration bus between PLC CPU and modular I/O expansion cards. IC Role / Device Role / Timing Role: QSPI-compatible isolator handling address/data multiplexing and direction switching for hot-swappable modules. Use Value: Provides deterministic 150 Mbps throughput with fail-safe default-low outputs - prevents spurious actuation during module insertion/removal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM3481BRSZ | 4-channel, 25 Mbps max, no direction control pin; uses iCoupler magnetic coupling | Lacks integrated DIR/ISO_DIR functionality - requires external logic for QSPI bus reversal | Choose when lower data rate suffices and magnetic isolation is preferred for cost-sensitive industrial use |
| ISO6741QDWR | 4-channel, 50 Mbps, no direction control; TI's capacitive isolation with 5000 VRMS rating | Lower isolation rating and no native QSPI-direction capability - unsuitable for 800 V EV systems requiring 6000 VRMS | Consider only for non-automotive 400 V systems where AEC-Q100 and reinforced insulation are not mandated |
Compared with ADUM3481BRSZ and ISO6741QDWR, SI86SQ44BB-IUR uniquely integrates direction control and 150 Mbps QSPI isolation in a single AEC-Q100-qualified package, eliminating external logic and enabling direct replacement in high-voltage automotive memory interfaces.
Availability
SI86SQ44BB-IUR is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and onboard chargers requiring stable component supply with automotive-grade lifecycle assurance.
Supply support for SI86SQ44BB-IUR 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 semiconductors, specializing in high-performance RF, timing, and isolation solutions for demanding communications and power systems.
The Si86Sxx family was engineered specifically for automotive and industrial isolation applications requiring reinforced safety certification, high CMTI, and flexible data protocols like QSPI - with SI86SQ44BB-IUR targeting bidirectional memory bus isolation.
FAQ
What is the isolation rating and safety certification status of SI86SQ44BB-IUR?
SI86SQ44BB-IUR provides 6000 VRMS reinforced isolation per UL 1577 and is certified to IEC 60747-17, CSA 62368-1/60601-1, and CQC GB4943.1. It meets AEC-Q100 Grade 0 qualification for automotive use up to +125 °C ambient. The WB SOIC-16 package delivers 10.3 mm creepage/clearance, enabling compliance in 800 V EV systems.
How does the DIR and ISO_DIR functionality work in SI86SQ44BB-IUR?
In SI86SQ44BB-IUR, the DIR pin (pin 7) is a side-A input that configures all four bidirectional channels for A→B or B→A flow. ISO_DIR (pin 9) is the isolated output replicating DIR's state on side B. This allows synchronized direction control across the barrier - essential for reliable QSPI half-duplex operation without timing skew or metastability.
Does SI86SQ44BB-IUR require external bypass capacitors, and what values are recommended?
Yes, SI86SQ44BB-IUR requires 0.1 µF and 10 µF ceramic bypass capacitors placed between VDD1–GND1 and VDD2–GND2, mounted as close as possible to the package pins. This ensures stable power delivery and noise suppression for RF modulation circuitry - omission risks increased jitter or startup failure.
What fail-safe output behavior does SI86SQ44BB-IUR support, and how is it selected?
SI86SQ44BB-IUR offers selectable default-high or default-low output states during unpowered conditions, configured at manufacturing via ordering option (denoted by suffix 'B' or 'L'). The 'B' in SI86SQ44BB-IUR indicates default-low behavior - ensuring outputs remain logic low if VDD1 or VDD2 drops below UVLO threshold, preventing undefined states in safety-critical power-up.
Can SI86SQ44BB-IUR be used in non-automotive industrial applications?
Yes, SI86SQ44BB-IUR is fully qualified for industrial use with –40 °C to +125 °C operation, 6000 VRMS isolation, and 100 kV/µs CMTI. Its QSPI-direction control and AEC-Q100 qualification make it especially valuable in high-reliability applications like industrial PLCs, medical imaging power supplies, and isolated ADC/DAC interfaces where deterministic bus reversal is required.
SI86SQ44BB-IUR 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:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 4/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- 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-QSOP
SI86SQ44BB-IUR FAQ
1.How can I place an order for SI86SQ44BB-IUR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SQ44BB-IUR 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-IUR reliable?
The price and inventory of SI86SQ44BB-IUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SQ44BB-IUR is usually 5 days.
3.What payment methods are accepted for SI86SQ44BB-IUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SQ44BB-IUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SQ44BB-IUR?
SI86SQ44BB-IUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SQ44BB-IUR 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-IUR?
For technical support, including SI86SQ44BB-IUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SQ44BB-IUR requirements.
6.How does Aetrix verify that SI86SQ44BB-IUR is sourced from the original manufacturer or authorized distributors?
All SI86SQ44BB-IUR 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-IUR meets industry standards.
7.What is the process for return or replacement of SI86SQ44BB-IUR?
All SI86SQ44BB-IUR units undergo pre-shipment inspection (PSI). If there is an issue with SI86SQ44BB-IUR, 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-IUR part is unused and in its original packaging.
Return procedure for SI86SQ44BB-IUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SQ44BB-IUR 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
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