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Skyworks Solutions Inc. SI86SQ44EB-IUR
- Part No.:
- SI86SQ44EB-IUR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI86SQ44EB-IUR.pdf
- Description:
- 2.5 KVRMS QSPI COMPATIBLE ISOLAT
- Quantity:
- Payment:
- Shipping:
Inventory:2,549
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Product details
Overview
SI86SQ44EB-IUR from Skyworks Solutions is a 5-channel reinforced digital isolator with quad-SPI bus support, featuring bidirectional channel direction control via DIR/ISO_DIR pins, 150 Mbps data rate, 10 ns typical propagation delay, and 6000 VRMS isolation rating for industrial and automotive systems requiring high-noise immunity and fail-safe operation.
For engineers reviewing the SI86SQ44EB-IUR datasheet, SI86SQ44EB-IUR pinout, SI86SQ44EB-IUR application, or SI86SQ44EB-IUR equivalent, this device serves as a custom QSPI isolator with reversible 4-channel data paths and one dedicated forward-direction control channel-critical for isolated memory interfaces in battery management systems, traction inverters, and industrial PLCs.
Technical Context
The SI86SQ44EB-IUR implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity (100 kV/µs CMTI). Its architecture supports dynamic bidirectional signal routing: DIR input sets A→B or B→A flow, while ISO_DIR provides isolated direction status to the secondary side.
It operates across 2.25–5.5 V supplies on both sides, features independent undervoltage lockout (UVLO) per side with 2.10–2.25 V thresholds, and includes tristate output enable (EN_A/EN_B) with internal 10 kΩ pull-ups-enabling precise power sequencing and bus contention control in half-duplex QSPI applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed QSPI memory read/write without protocol translation |
| Propagation delay | 10 ns typical - enables tight timing budgets in real-time motor control and ADC sampling loops |
| Isolation rating | 6000 VRMS - meets reinforced insulation requirements per UL 1577 and IEC 60747-17 for 600 VAC systems |
| Supply voltage | 2.25–5.5 V per side - interoperates with 3.3 V and 5 V logic domains without level shifters |
| Operating temperature | –40 to +125 °C - qualified for under-hood automotive and industrial ambient environments |
| CMTI | ≥100 kV/µs - prevents false triggering in high-dV/dt environments like SiC/GaN inverter gate drives |
| Fail-safe mode | Default low output - ensures safe state during supply loss in safety-critical BMS monitoring paths |
Pinout & Package
SI86SQ44EB-IUR is housed in a narrow-body SOIC-16 package (NB SOIC-16), 10.3 mm × 7.5 mm × 2.35 mm, with creepage/clearance ≥8.3 mm to meet reinforced insulation standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1, VDD2 | Independent power supplies | Side A and Side B each require local 0.1 µF + 10 µF bypassing; no shared supply dependency |
| GND1, GND2 | Isolated ground references | Must be routed on separate PCB planes; no direct connection across isolation barrier |
| A1–A4, B1–B4 | Bidirectional I/O channels | Four data lines configurable A→B or B→A via DIR; all support Schmitt-trigger inputs for noise rejection |
| DIR | Direction control input | Active-high logic on Side A; determines signal flow direction for all four data channels simultaneously |
| ISO_DIR | Isolated direction status output | Provides mirrored DIR state on Side B-enables synchronized peripheral-side bus arbitration |
| EN_A, EN_B | Output enable inputs | Active-high enables transmitter/receiver; tristates outputs when low-prevents bus conflicts during reset |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation | Eliminates LED aging and temperature drift of optocouplers; achieves stable 150 Mbps performance over full temperature range |
| Custom QSPI mode | Supports half-duplex quad-data-line isolation with single-direction control-replaces four discrete isolators in memory interface designs |
| Reinforced safety certification | UL 1577 (6000 VRMS), VDE 60747-17, CSA 62368-1, CQC GB4943.1 - enables single-component compliance for end-equipment safety approvals |
| Fail-safe default low | Guarantees logic-low output during VDD1/VDD2 brownout-critical for disabling gate drivers or asserting fault latches in power systems |
| High CMTI immunity | 100 kV/µs minimum common-mode transient immunity-maintains data integrity in SiC inverter switching noise environments |
Applications
| Industrial PLC I/O Modules | Automotive Battery Management Systems |
|---|---|
Use Scenario: Isolating digital I/O between microcontroller and field-side sensors/actuators in programmable logic controllers. IC Role / Device Role / Timing Role: SI86SQ44EB-IUR acts as bidirectional data isolator for QSPI-configured sensor arrays and DACs, with DIR-controlled channel reversal for diagnostic loopback. Use Value: Enables single-chip isolation of four data lines plus direction control-reducing BOM count by 5× versus discrete isolators and improving timing alignment across channels. | Use Scenario: Isolating communication between MCU and cell monitor ICs in high-voltage battery packs (400–800 V). IC Role / Device Role / Timing Role: SI86SQ44EB-IUR provides isolated QSPI interface for daisy-chained battery monitors, with ISO_DIR ensuring synchronized direction awareness across isolation barrier. Use Value: Meets reinforced insulation requirements for functional safety (ASIL-B), eliminates need for external direction logic, and maintains <10 ns inter-channel skew for accurate cell voltage sampling. |
| Traction Inverter Gate Driver Interface | Isolated Switch-Mode Power Supply Control |
Use Scenario: Transmitting PWM and fault signals between MCU and isolated gate driver ICs in EV traction inverters. IC Role / Device Role / Timing Role: SI86SQ44EB-IUR routes bidirectional status/control signals (e.g., DESAT feedback, gate drive enable) with fail-safe low default during UVLO events. Use Value: 100 kV/µs CMTI prevents false turn-on during 10 kV/µs switching transients; 10 ns propagation delay supports >100 kHz PWM carrier frequencies. | Use Scenario: Isolating feedback signals (voltage/current sense) and control commands (PWM duty cycle) in isolated DC-DC converters. IC Role / Device Role / Timing Role: SI86SQ44EB-IUR isolates analog-to-digital converter outputs and controller-side command inputs using its four reversible channels and dedicated DIR path. Use Value: Reinforced 6000 VRMS rating supports 3 kVRMS working voltage in medical-grade PSUs; low 0.85 mA quiescent current minimizes standby losses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM3481BRNZ | 4-channel, 25 Mbps, 2.5 kVRMS, no direction control pin, CMOS input only | Lacks DIR/ISO_DIR functionality; unsuitable for QSPI bus reversal; lower speed limits use in high-frequency memory interfaces | Select only if system uses fixed unidirectional SPI and requires lower cost at expense of bandwidth and flexibility |
| ISO6741QDWR | 4-channel, 50 Mbps, 5000 VRMS, no integrated direction control, Schmitt-trigger inputs | Requires external logic for bidirectional control; lower CMTI (85 kV/µs); not AEC-Q100 qualified | Consider for non-automotive industrial applications where direction control is implemented externally and 50 Mbps suffices |
Compared with ADUM3481BRNZ and ISO6741QDWR, SI86SQ44EB-IUR delivers 3× higher data rate, integrated QSPI-direction control, reinforced 6000 VRMS isolation, and AEC-Q100 qualification-making it uniquely suited for automotive BMS and high-performance industrial memory isolation where timing, safety, and bus flexibility are co-constrained.
Availability
SI86SQ44EB-IUR is available at Aetrix Electronics and suitable for industrial automation systems, battery management systems, and traction inverters requiring stable component supply with long-term lifecycle assurance.
Supply support for SI86SQ44EB-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 semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.
The SI86S6xx family-including SI86SQ44EB-IUR-is designed specifically for high-reliability, high-noise-immunity digital isolation in automotive, industrial, and medical systems where reinforced safety certification and precise timing are mandatory.
FAQ
What is the isolation voltage rating of the SI86SQ44EB-IUR?
The SI86SQ44EB-IUR has a reinforced isolation rating of 6000 VRMS per UL 1577 for 1 minute, validated per IEC 60747-17. This rating applies to the NB SOIC-16 package and supports working voltages up to 3000 VDC in end equipment complying with IEC 62368-1 and IEC 60601-1.
Does the SI86SQ44EB-IUR support QSPI bus isolation with direction control?
Yes, the SI86SQ44EB-IUR is explicitly designed as a custom QSPI isolator. It provides four reversible data channels (A1–A4/B1–B4) and one dedicated forward-direction channel (DIR/ISO_DIR), enabling seamless half-duplex QSPI signal isolation with dynamic bus reversal-no external logic required.
What is the default output state of the SI86SQ44EB-IUR during power loss?
The SI86SQ44EB-IUR is configured for default-low fail-safe operation. When either VDD1 or VDD2 falls below UVLO threshold (2.10 V), outputs enter high-impedance state initially, then settle to logic low after reset-ensuring safe deactivation of downstream circuits in BMS or inverter control paths.
How does the DIR and ISO_DIR pin functionality work in the SI86SQ44EB-IUR?
DIR is a Side A input that configures all four data channels for A→B (high) or B→A (low) flow. ISO_DIR is the isolated output of DIR on Side B, providing real-time direction status to peripherals-enabling synchronized bus arbitration without crossing the isolation barrier with additional signals.
Is the SI86SQ44EB-IUR qualified for automotive applications?
Yes, the SI86SQ44EB-IUR is AEC-Q100 qualified for Grade 1 (–40 to +125 °C) operation. It is manufactured using automotive-specific process flows, supports AIAG-compliant PPAP documentation, and carries IMDS/CAMDS listings-meeting requirements for onboard chargers, battery management, and traction inverters.
SI86SQ44EB-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
SI86SQ44EB-IUR FAQ
1.How can I place an order for SI86SQ44EB-IUR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SQ44EB-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 SI86SQ44EB-IUR reliable?
The price and inventory of SI86SQ44EB-IUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SQ44EB-IUR is usually 5 days.
3.What payment methods are accepted for SI86SQ44EB-IUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SQ44EB-IUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SQ44EB-IUR?
SI86SQ44EB-IUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SQ44EB-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 SI86SQ44EB-IUR?
For technical support, including SI86SQ44EB-IUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SQ44EB-IUR requirements.
6.How does Aetrix verify that SI86SQ44EB-IUR is sourced from the original manufacturer or authorized distributors?
All SI86SQ44EB-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 SI86SQ44EB-IUR meets industry standards.
7.What is the process for return or replacement of SI86SQ44EB-IUR?
All SI86SQ44EB-IUR units undergo pre-shipment inspection (PSI). If there is an issue with SI86SQ44EB-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 SI86SQ44EB-IUR part is unused and in its original packaging.
Return procedure for SI86SQ44EB-IUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SQ44EB-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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