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Skyworks Solutions Inc. SI8642BB-AU
- Part No.:
- SI8642BB-AU
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8642BB-AU.pdf
- Description:
- AUTOMOTIVE 2.5 KV 2 FORWARD & 2
- Quantity:
- Payment:
- Shipping:
Inventory:1,027
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Product details
Overview
SI8642BB-AU from Skyworks is a quad-channel digital isolator with 2 input channels on VDD1 side and 2 output channels on VDD2 side, providing reinforced 2.5 kVRMS isolation in QSOP-16 package. It supports DC–150 Mbps data rates, achieves <10 ns propagation delay, and operates across –40 to +125 °C with 2.5–5.5 V dual supply rails. It is used in isolated motor control gate drivers and battery management system signal interfaces.
For engineers reviewing the SI8642BB-AU datasheet, SI8642BB-AU pinout, SI8642BB-AU application, or SI8642BB-AU equivalent, key selection criteria include fail-safe default-low output state, 2.5 kVRMS isolation rating, QSOP-16 footprint compatibility, and AEC-Q100 qualification for automotive-grade operation.
Technical Context
The SI8642BB-AU implements RF-based on/off keying across a silicon-die isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical components. Its architecture delivers precise timing with ≤2.5 ns channel-to-channel skew and ≤4.5 ns propagation delay skew.
It features two independent enable inputs (EN1, EN2), each controlling one pair of outputs (A3/A4 and B1/B2 respectively), supporting tri-state output control per side. The device includes Schmitt-trigger inputs, undervoltage lockout (UVLO) on both sides, and selectable fail-safe mode-here configured as default-low output during power loss on VDD1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2.5 kVRMS reinforced insulation - meets IEC 60950-1, IEC 62368-1, and VDE 0884-10 basic certification. |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and isolated ADC/DAC clocking. |
| Propagation Delay | 5.0–13.0 ns - ensures tight timing alignment in real-time motor control feedback loops. |
| Channel Skew | ≤2.5 ns - enables synchronous sampling across dual isolated analog front-ends. |
| Supply Voltage | 2.5–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V sensor interfaces. |
| Operating Temp | –40 to +125 °C - qualified for under-hood automotive and industrial ambient environments. |
| CMTI | ≥60 kV/µs - maintains signal integrity in high-di/dt motor drive and inverter applications. |
Pinout & Package
SI8642BB-AU is housed in a RoHS-compliant QSOP-16 package (5.3 mm × 10.2 mm, 1.0 mm height) with 0.635 mm lead pitch and creepage ≥5.5 mm. This narrow-body surface-mount package supports automated assembly and fits space-constrained automotive ECUs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies logic and transmitter circuitry for channels A1–A4; requires 0.1 µF bypass capacitor. |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by isolation barrier. |
| A1, A2 | Input signals (VDD1 side) | Digital inputs with Schmitt-trigger thresholds (VT+ = 1.67 V typ, VT– = 1.23 V typ). |
| EN1 | Enable control for outputs A3, A4 | Active-high; drives A3/A4 into high-impedance when low - enables dynamic channel gating. |
| VDD2 | Output-side power supply | Supplies receiver and output driver circuitry for B1–B4; independent of VDD1. |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1. |
| B1, B2 | Output signals (VDD2 side) | CMOS-compatible outputs with 50 Ω nominal impedance; default-low during VDD1 power loss. |
| EN2 | Enable control for outputs B1, B2 | Active-high; disables B1/B2 into high-Z - supports isolated bus arbitration or sleep-mode control. |
Key Features
| Feature | Design Value |
|---|---|
| Fail-safe default-low output | Guarantees known logic state at B1/B2 during VDD1 brownout - critical for safe shutdown in traction inverters. |
| Tri-state outputs with dual EN pins | EN1 and EN2 independently disable A3/A4 and B1/B2, enabling flexible isolation domain partitioning. |
| Ultra-low power at 100 Mbps | 11 mA per side at 5 V / 100 Mbps - reduces thermal load in densely packed BMS modules. |
| RF-based isolation architecture | No LED aging or temperature drift; stable propagation delay (<±0.5 ns variation over temp) vs optocouplers. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use up to +125 °C ambient - supports OBC, battery monitoring, and ADAS subsystems. |
Applications
| Motor Control Feedback Isolation | Automotive Battery Management |
|---|---|
|
Use Scenario: Isolating encoder position signals and current-sense ADC outputs from MCU in EV traction inverter. IC Role / Device Role / Timing Role: SI8642BB-AU transmits bidirectional PWM gate commands and unidirectional analog feedback across isolation barrier with <13 ns delay. Use Value: Enables precise IGBT/SiC FET switching synchronization while preventing ground-loop noise corruption of 16-bit current measurements. |
Use Scenario: Signal isolation between cell monitor ICs (e.g., BQ796xx) and main BMS controller in 800 V battery packs. IC Role / Device Role / Timing Role: SI8642BB-AU carries daisy-chain UART commands and voltage/temperature telemetry across 2.5 kVRMS barrier. Use Value: Maintains functional safety integrity (ASIL-B capable) and prevents fault propagation during cell-level overvoltage events. |
| Isolated Switch-Mode Power Supply | Industrial PLC Digital I/O |
|
Use Scenario: Providing isolated feedback for secondary-side regulation in 1 kW LLC resonant converter for charging infrastructure. IC Role / Device Role / Timing Role: SI8642BB-AU transmits error amplifier output and synchronous rectifier timing signals across primary-secondary barrier. Use Value: Achieves <5 ns pulse width distortion - preserves ZVS timing margin and improves efficiency above 96%. |
Use Scenario: Isolating 24 V DC field I/O signals (start/stop, limit switches) from 3.3 V PLC CPU backplane in factory automation. IC Role / Device Role / Timing Role: SI8642BB-AU conditions and forwards discrete inputs/outputs with Schmitt-trigger noise immunity and fail-safe low default. Use Value: Eliminates need for external pull-downs or debounce circuits - reduces BOM count and PCB area in modular I/O cards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8642BB-IS1 | Narrow-body SOIC-16 (3.9 mm width); same electrical specs and 2.5 kVRMS rating. | Requires PCB land pattern change; better suited for legacy industrial designs using SOIC footprints. | Choose for drop-in replacement where QSOP-16 is unavailable and board rework is acceptable. |
| ADUM2402BRWZ | 2.5 kVRMS, 25 Mbps max rate, 35 ns propagation delay, no dual-enable functionality. | Lacks fail-safe default-low option and AEC-Q100 qualification; limited to non-automotive industrial use. | Choose only if data rate ≤25 Mbps suffices and automotive qualification is not required. |
Compared with SI8642BB-AU, SI8642BB-IS1 offers identical performance in a different package but demands layout revision, while ADUM2402BRWZ trades speed, timing precision, and automotive readiness for broader distributor availability in legacy systems.
Availability
SI8642BB-AU is available at Aetrix Electronics and suitable for automotive battery management systems, traction inverter controls, and industrial PLC I/O modules requiring stable component supply across extended temperature and high-reliability lifecycles.
Supply support for SI8642BB-AU 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 Si864x family was designed specifically for high-reliability, high-speed digital isolation in automotive and industrial systems - emphasizing AEC-Q100 compliance, low-power operation, and reinforced safety certification.
FAQ
What is the isolation rating and safety certification status of SI8642BB-AU?
SI8642BB-AU provides 2.5 kVRMS reinforced isolation and is certified to UL 1577, CSA Component Acceptance Notice 5A, VDE 0884-10 (basic), IEC 60950-1, and IEC 62368-1. It meets automotive requirements per AEC-Q100 Grade 1 and supports functional safety architectures up to ASIL-B when integrated per ISO 26262 guidelines. SI8642BB-AU does not carry VDE 0884-10 reinforced certification - that applies only to Si864xxT variants.
Does SI8642BB-AU support fail-safe operation, and what is its default output state?
Yes, SI8642BB-AU is ordered with selectable fail-safe mode - the "BB" suffix indicates default-low output state when VDD1 is unpowered but VDD2 remains active. During power loss on the input side, B1 and B2 assert logic low within 12 ns (tSD), ensuring predictable behavior in safety-critical shutdown sequences. SI8642BB-AU maintains this behavior across its full –40 to +125 °C operating range.
What are the supply voltage requirements and power consumption characteristics of SI8642BB-AU?
SI8642BB-AU operates with independent 2.5–5.5 V supplies on both VDD1 and VDD2 sides. At 5 V and 100 Mbps, it draws 11 mA per side (22 mA total). At 1 Mbps, consumption drops to 3.3 mA per side. These values are measured with 15 pF load and reflect typical performance - actual current depends on data pattern, load capacitance, and supply voltage. SI8642BB-AU requires 0.1 µF bypass capacitors on both VDD pins.
How does the enable functionality work on SI8642BB-AU, and which outputs does each EN pin control?
SI8642BB-AU has two independent enable inputs: EN1 controls outputs A3 and A4 (on VDD1 side), while EN2 controls outputs B1 and B2 (on VDD2 side). Both are active-high; driving either EN low places its associated outputs in high-impedance state. This allows selective channel disabling without affecting other isolated paths - useful for power-gating isolated communication buses or implementing isolated watchdog reset logic. SI8642BB-AU's EN pins have internal pull-ups and can be left floating in noise-controlled environments.
What package type and pin compatibility does SI8642BB-AU use, and is it RoHS-compliant?
SI8642BB-AU uses a 16-pin QSOP package (5.3 mm × 10.2 mm, 0.635 mm pitch) with RoHS-compliant matte tin lead finish and JEDEC-standard 260 °C peak reflow profile. It is not pin-compatible with SOIC-16 variants (e.g., SI8642BB-IS1) due to different body dimensions and lead form - direct substitution requires PCB layout modification. SI8642BB-AU is compatible with standard QSOP pick-and-place equipment and supports automated optical inspection (AOI) of solder joints.
SI8642BB-AU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 2/2
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 35kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 13ns, 13ns
- Pulse Width Distortion (Max):
- 4.5ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 2.375V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
SI8642BB-AU FAQ
1.How can I place an order for SI8642BB-AU through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8642BB-AU 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 SI8642BB-AU reliable?
The price and inventory of SI8642BB-AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8642BB-AU is usually 5 days.
3.What payment methods are accepted for SI8642BB-AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8642BB-AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8642BB-AU?
SI8642BB-AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8642BB-AU 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 SI8642BB-AU?
For technical support, including SI8642BB-AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8642BB-AU requirements.
6.How does Aetrix verify that SI8642BB-AU is sourced from the original manufacturer or authorized distributors?
All SI8642BB-AU 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 SI8642BB-AU meets industry standards.
7.What is the process for return or replacement of SI8642BB-AU?
All SI8642BB-AU units undergo pre-shipment inspection (PSI). If there is an issue with SI8642BB-AU, 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 SI8642BB-AU part is unused and in its original packaging.
Return procedure for SI8642BB-AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8642BB-AU 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.
-
ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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