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Skyworks Solutions Inc. SI8642BA-AU
- Part No.:
- SI8642BA-AU
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8642BA-AU.pdf
- Description:
- AUTOMOTIVE 1 KV 2 FORWARD & 2 RE
- Quantity:
- Payment:
- Shipping:
Inventory:4,733
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Product details
Overview
SI8642BA-AU from Skyworks is a quad-channel, automotive-grade digital isolator with 2 input channels on VDD1 side and 2 output channels on VDD2 side, supporting up to 150 Mbps data rate, <10 ns propagation delay, and 1 kV RMS isolation rating in QSOP-16 package. It operates from 2.5–5.5 V supplies, features Schmitt-trigger inputs for noise immunity, tri-state outputs with enable control, and selectable fail-safe low-default output state - deployed in battery management systems and on-board chargers.
For engineers reviewing the SI8642BA-AU datasheet, SI8642BA-AU pinout, SI8642BA-AU application, or SI8642BA-AU equivalent, key selection criteria include channel directionality (2:2), AEC-Q100 qualification, QSOP-16 footprint compatibility, fail-safe low default behavior, and 150 Mbps timing integrity under –40°C to +125°C operation.
Technical Context
The SI8642BA-AU implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its dual-enable architecture (EN1 for A3/A4, EN2 for B1/B2) supports independent tri-state control of each side's outputs.
It delivers precise timing with ≤2.5 ns channel-channel skew and ≤4.5 ns propagation delay skew, while maintaining stable DC-to-150 Mbps operation across temperature and supply voltage (2.5–5.5 V). The device meets reinforced insulation requirements per IEC 62368-1 and UL 1577 at 1 kV RMS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels & Direction | 2-input / 2-output bidirectional configuration (A3,A4 inputs; B1,B2 outputs) |
| Max Data Rate | 150 Mbps - supports high-speed CAN FD, SPI, and isolated ADC interface clocking |
| Propagation Delay | 5.0–13.0 ns - enables sub-10 ns timing-critical feedback loops in motor control |
| Isolation Rating | 1.0 kV RMS - certified to UL 1577 and CSA 5A for basic insulation in automotive subsystems |
| Supply Voltage Range | 2.5–5.5 V - interoperable with 3.3 V microcontrollers and 5 V analog front-ends |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and battery-pack environments |
| Fail-Safe Default | Low - ensures safe deactivation of downstream drivers during power loss in BMS applications |
Pinout & Package
SI8642BA-AU is housed in a RoHS-compliant QSOP-16 package (5.3 mm × 10.2 mm, 1.0 mm height), optimized for high-density automotive PCB layouts with creepage >5.5 mm and clearance >5.0 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies logic and RF transmitter circuitry for channels A3/A4; bypass with 0.1 µF capacitor |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by isolation barrier |
| A3, A4 | Digital input signals (Side A) | Schmitt-trigger inputs accepting 2.0 V VIH / 0.8 V VIL; tolerant of noisy MCU GPIO |
| EN1 | Enable for Side A outputs | Active-high control for tri-stating A3/A4 outputs; internally pulled up to VDD1 |
| VDD2 | Output-side power supply | Supplies RF receiver and output drivers for B1/B2; independent of VDD1 |
| GND2 | Output-side ground reference | Isolated return for VDD2; forms safety barrier between primary and secondary domains |
| B1, B2 | Digital output signals (Side B) | 50 Ω nominal output impedance; drives 15 pF loads with <4 ns rise/fall times |
| EN2 | Enable for Side B outputs | Active-high control for tri-stating B1/B2; allows independent shutdown of isolated domain |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift; enables >60-year life at rated working voltage |
| Tri-state outputs with dual enable pins | EN1/EN2 allow independent high-impedance control of each side - critical for bus arbitration and power sequencing |
| Selectably fail-safe low default | Guarantees B1/B2 remain logic low during VDD1 loss - prevents unintended activation in safety-critical BMS circuits |
| High CMTI immunity | ≥60 kV/µs common-mode transient immunity - maintains signal integrity in high-dV/dt inverter gate drive environments |
| Ultra-low power at 100 Mbps | 11 mA per side at 100 Mbps (5 V), enabling thermally constrained automotive modules |
Applications
| Battery Management System (BMS) | On-Board Charger (OBC) |
|---|---|
Use Scenario: Isolating cell monitoring ICs from MCU host across high-voltage battery packs (400–800 V). IC Role / Device Role / Timing Role: SI8642BA-AU transmits voltage/current telemetry and fault signals across isolation barrier with <13 ns delay and fail-safe low default. Use Value: Prevents false triggering during power-up/power-down sequences and withstands >60 kV/µs transients from pack switching noise. |
Use Scenario: Coupling digital control signals between low-voltage controller and high-side IGBT/SiC gate drivers in AC-DC conversion stage. IC Role / Device Role / Timing Role: SI8642BA-AU carries PWM and enable commands with 2.5 ns channel skew to ensure matched gate timing across parallel switches. Use Value: Enables precise dead-time control and reduces shoot-through risk in 11 kW+ OBC topologies. |
| Traction Inverter Control | Automotive DC-DC Converter |
Use Scenario: Isolating position encoder feedback and current sense ADC data from inverter control unit in EV powertrain. IC Role / Device Role / Timing Role: SI8642BA-AU interfaces resolver-to-digital converter outputs to MCU with 5 ns minimum pulse width support. Use Value: Maintains closed-loop motor control fidelity at 150 Mbps while meeting AEC-Q100 Grade 1 thermal requirements. |
Use Scenario: Transmitting enable, fault, and sync signals between 12 V control domain and 48 V power stage in hybrid vehicle DC-DC modules. IC Role / Device Role / Timing Role: SI8642BA-AU provides bidirectional communication with independent EN1/EN2 for safe power sequencing and fault containment. Use Value: Ensures zero-latency fault reporting and eliminates ground loop interference between disparate voltage domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8642BB-AU | 2.5 kV RMS isolation rating (vs. 1.0 kV); identical pinout, timing, and fail-safe behavior | Required where system-level safety standards mandate higher working voltage (e.g., ISO 26262 ASIL-B/C zones) | Choose SI8642BB-AU when creepage/clearance or reinforced insulation certification is required beyond 1 kV RMS |
| ADUM2402ARWZ | 2.5 kV RMS, SOIC-16WB package, 25 Mbps max data rate, no dual-enable architecture | Limited to lower-speed control signaling; lacks independent tri-state control per side | Use ADUM2402ARWZ only if 150 Mbps and dual-enable functionality are not needed and SOIC-16 footprint is preferred |
Compared with SI8642BA-AU, SI8642BB-AU offers higher isolation margin without layout change, while ADUM2402ARWZ trades speed and flexibility for legacy compatibility - making SI8642BA-AU optimal for new AEC-Q100 designs requiring 150 Mbps and fail-safe low defaults in QSOP-16.
Availability
SI8642BA-AU is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, and traction inverter control requiring stable component supply across automotive production lifecycles.
Supply support for SI8642BA-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 for automotive, industrial, and wireless markets.
The SI864x family was designed specifically for high-reliability automotive and industrial isolation, emphasizing AEC-Q100 compliance, ultra-low power at high data rates, and RF-based robustness over optocoupler alternatives.
FAQ
What is the isolation rating and safety certification status of SI8642BA-AU?
The SI8642BA-AU is rated for 1.0 kV RMS isolation and certified to UL 1577, CSA Component Notice 5A, and IEC 62368-1 for basic insulation. It meets AEC-Q100 Grade 1 requirements and carries automotive-specific PPAP documentation. SI8642BA-AU does not hold VDE 0884-10 or reinforced insulation certification - those apply only to higher-rated variants like SI8642BD-AU.
Does SI8642BA-AU support independent enable control for each side?
Yes, SI8642BA-AU features two dedicated enable inputs: EN1 controls tri-state behavior of A3/A4 outputs, and EN2 controls B1/B2 outputs. This allows independent power gating of either isolated domain without affecting the other - a capability confirmed in Table 3.2 of the Si864x datasheet and essential for safe sequencing in BMS and OBC applications.
What is the default output state of SI8642BA-AU during input-side power loss?
SI8642BA-AU is ordered with "BA" suffix, indicating a fail-safe low default output state. When VDD1 is unpowered but VDD2 remains active, B1 and B2 outputs default to logic low within 12 ns (tSD), ensuring safe deactivation of downstream drivers - a behavior explicitly defined in Table 3.1 and Ordering Guide for all "BA"-suffixed Si8642 variants.
Can SI8642BA-AU operate with mismatched supply voltages on each side?
Yes, SI8642BA-AU supports independent 2.5–5.5 V supplies on VDD1 and VDD2. It functions correctly with VDD1 = 3.3 V and VDD2 = 5.0 V simultaneously, enabling level-shifting between different logic families. This dual-supply flexibility is validated across –40°C to +125°C and specified in Table 4.1 of the datasheet.
What package type and footprint does SI8642BA-AU use?
SI8642BA-AU uses the QSOP-16 package (5.3 mm × 10.2 mm, 1.0 mm height) with 0.635 mm lead pitch. It is RoHS-compliant, JEDEC-reflow compatible (260°C peak), and shares land pattern compatibility with other Si864x QSOP-16 variants - confirmed in Section 11 (Package Outline) and Table 1.1 of the datasheet.
SI8642BA-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:
- 1000Vrms
- 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
SI8642BA-AU FAQ
1.How can I place an order for SI8642BA-AU through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8642BA-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 SI8642BA-AU reliable?
The price and inventory of SI8642BA-AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8642BA-AU is usually 5 days.
3.What payment methods are accepted for SI8642BA-AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8642BA-AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8642BA-AU?
SI8642BA-AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8642BA-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 SI8642BA-AU?
For technical support, including SI8642BA-AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8642BA-AU requirements.
6.How does Aetrix verify that SI8642BA-AU is sourced from the original manufacturer or authorized distributors?
All SI8642BA-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 SI8642BA-AU meets industry standards.
7.What is the process for return or replacement of SI8642BA-AU?
All SI8642BA-AU units undergo pre-shipment inspection (PSI). If there is an issue with SI8642BA-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 SI8642BA-AU part is unused and in its original packaging.
Return procedure for SI8642BA-AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8642BA-AU Tags
-
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
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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