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Skyworks Solutions Inc. SI8642EB-AU
- Part No.:
- SI8642EB-AU
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8642EB-AU.pdf
- Description:
- AUTOMOTIVE 2.5 KV 2 FORWARD & 2
- Quantity:
- Payment:
- Shipping:
Inventory:3,666
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Product details
Overview
SI8642EB-AU from Skyworks is a quad-channel 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 2.5 kV RMS isolation rating in QSOP-16 package. It features Schmitt-trigger inputs, tri-state outputs with independent enable control (EN1/EN2), and selectable high-default fail-safe mode - used in isolated motor control feedback loops and battery management system signal conditioning.
For engineers reviewing the SI8642EB-AU datasheet, SI8642EB-AU pinout, SI8642EB-AU application, or SI8642EB-AU equivalent, this page delivers verified electrical specs, fail-safe behavior under power loss, QSOP-16 layout guidance, and automotive-grade AEC-Q100 qualification details critical for industrial and EV traction inverter designs.
Technical Context
The SI8642EB-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 controls A3/A4; EN2 controls B1/B2) supports independent channel gating for time-synchronized isolation in bidirectional communication paths.
Each channel maintains stable timing performance across –40°C to +125°C, with 0.5 ns typical channel-to-channel skew and 2 ns propagation delay skew. The device operates from 2.5–5.5 V on both sides and achieves 50 kV/µs common-mode transient immunity - meeting reinforced insulation requirements per VDE 0884-10 for 2.5 kV-rated variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed SPI, RS-485, and CAN FD signal isolation without timing bottlenecks. |
| Propagation Delay | <10 ns typ - enables sub-microsecond closed-loop response in motor gate driver feedback paths. |
| Isolation Rating | 2.5 kV RMS - certified to UL 1577, CSA 5A, and basic VDE 0884-10 for industrial safety compliance. |
| Supply Voltage Range | 2.5–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends. |
| Fail-Safe Default | High - ensures active-high enable signals remain asserted during VDD1 loss in BMS monitoring circuits. |
| Package | QSOP-16 - 0.150" wide body with 1.27 mm pitch; compatible with standard SMT reflow and offers 8.3 mm creepage. |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
SI8642EB-AU uses a 16-pin QSOP package with 1.27 mm pitch and 8.3 mm creepage distance. Pin numbering follows standard QSOP convention (pin 1 marked by dot or bevel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | VDD1, GND1, IN1, IN2 | Input-side power, ground, and two digital inputs referenced to VDD1 - accepts 2.5–5.5 V logic levels. |
| 5, 6, 7, 8 | EN1, GND1, A3, A4 | Enable control for output channels A3/A4; A3/A4 are tri-stated when EN1 = L - supports dynamic channel shutdown. |
| 9, 10, 11, 12 | VDD2, GND2, B1, B2 | Output-side power, ground, and two isolated outputs referenced to VDD2 - drive 50 Ω loads directly. |
| 13, 14, 15, 16 | EN2, GND2, NC, NC | Enable control for B1/B2; pins 15–16 are no-connect - must be left floating or tied to GND/VDD2 per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; enables >60-year lifetime at rated working voltage. |
| Schmitt-trigger inputs | 0.44 V typical hysteresis - rejects >100 mV of coupled noise on long PCB traces in motor drives. |
| Independent dual-enable control | EN1 gates A3/A4; EN2 gates B1/B2 - allows synchronized isolation of PWM and fault signals in half-bridge drivers. |
| High-default fail-safe mode | Outputs go high when VDD1 is unpowered - maintains safe state in BMS overvoltage detection circuits. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use up to +125°C ambient - supports OBC and traction inverter applications. |
Applications
| Motor Control Feedback | Battery Management System |
|---|---|
|
Use Scenario: Isolating encoder signals and current-sense ADC outputs in servo drives. IC Role / Device Role / Timing Role: Quad-channel isolator separating low-voltage MCU domain from high-noise IGBT gate driver domain. Use Value: 0.5 ns channel-channel skew preserves phase alignment between current and position sampling clocks. |
Use Scenario: Signal isolation between cell monitor ICs and main BMS controller in EV packs. IC Role / Device Role / Timing Role: Bidirectional isolator carrying voltage measurement data and cell balancing commands across isolation barrier. Use Value: High-default fail-safe ensures balancing FETs disable safely during MCU power interruption. |
| On-Board Charger | Traction Inverter Control |
|
Use Scenario: Isolating AC line sensing and DC link voltage feedback in bidirectional OBCs. IC Role / Device Role / Timing Role: Dual-input/dual-output isolator routing grid synchronization signals and DC bus measurements. Use Value: 150 Mbps capability supports high-resolution sigma-delta ADC data streaming without oversampling penalty. |
Use Scenario: Isolating gate driver enable/disable signals and fault reporting from inverter module to MCU. IC Role / Device Role / Timing Role: Fail-safe isolator ensuring gate drivers remain disabled during control power loss. Use Value: 50 kV/µs CMTI prevents false triggering during 10 kV surge events in 800 V EV architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM140D0BRIZ | 4-channel, 150 Mbps, 2.5 kV RMS, SOIC-16; no independent enable pins - single EN controls all outputs. | Lacks per-channel enable control; unsuitable for asymmetric gating in motor control where A3/A4 and B1/B2 require separate timing. | Select ADUM140D0BRIZ only if unified enable suffices and SOIC-16 footprint is preferred over QSOP-16. |
| ISO6742FDWR | 4-channel, 50 Mbps, 5 kV RMS, SOIC-16; higher isolation but lower speed and no fail-safe default option. | Insufficient data rate for high-resolution ADC interfaces; requires external pull-up/pull-down for default state control. | Choose ISO6742FDWR only when 5 kV isolation is mandatory and system timing budget allows ≤50 Mbps operation. |
Compared with ADUM140D0BRIZ and ISO6742FDWR, SI8642EB-AU uniquely combines per-channel enable control, high-default fail-safe behavior, and 150 Mbps throughput in a thermally efficient QSOP-16 package - making it optimal for automotive BMS and traction inverter signal integrity-critical paths.
Availability
SI8642EB-AU is available at Aetrix Electronics and suitable for battery management systems, motor control feedback loops, and on-board charger signal isolation requiring stable component supply across automotive and industrial production cycles.
Supply support for SI8642EB-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 industrial and automotive isolation needs - delivering ultra-low-power, high-speed, and AEC-Q100-qualified digital isolation in compact packages.
FAQ
What is the default output state of SI8642EB-AU during input-side power loss?
The SI8642EB-AU has a high-default fail-safe mode: when VDD1 is unpowered but VDD2 remains active, outputs A3 and A4 retain logic-high state. This behavior is factory-configured per ordering code "EB" and ensures safe deactivation of downstream circuits like gate drivers or fault latches in battery management systems. SI8642EB-AU does not require external pull-ups to achieve this state.
Does SI8642EB-AU support independent enable control for each channel pair?
Yes. SI8642EB-AU provides two dedicated enable inputs: EN1 controls outputs A3 and A4, while EN2 controls outputs B1 and B2. This allows independent tri-state control of input and output channel groups - essential for synchronizing isolated PWM signals and fault reporting in half-bridge motor drivers. SI8642EB-AU's truth table confirms Hi-Z output states only occur when the corresponding EN pin is driven low.
What isolation certifications apply to SI8642EB-AU?
SI8642EB-AU is certified to UL 1577 (2.5 kV RMS, 1 min), CSA Component Notice 5A, and basic VDE 0884-10. It meets IEC 62368-1 and IEC 60601-1 reinforced insulation requirements for medical and industrial end equipment. SI8642EB-AU is not rated to VDE 0884-10 reinforced level - that applies only to Si864xxT variants with 5 kV rating.
Can SI8642EB-AU operate with mismatched supply voltages on VDD1 and VDD2?
Yes. SI8642EB-AU supports independent 2.5–5.5 V operation on VDD1 and VDD2 sides - enabling level translation between 3.3 V microcontrollers and 5 V analog sensors or gate drivers. Electrical specifications guarantee full performance across this range, including propagation delay stability and CMTI >35 kV/µs, as validated in Table 4.2 of the datasheet for SI8642EB-AU.
Is SI8642EB-AU qualified for automotive applications?
Yes. SI8642EB-AU carries the "-AU" suffix indicating Automotive Grade qualification per AEC-Q100 Grade 1 (–40°C to +125°C). It is manufactured using automotive-specific process flows, supported by AIAG-compliant PPAP documentation, and listed in IMDS/CAMDS. SI8642EB-AU is deployed in on-board chargers, battery management systems, and traction inverters for BEV/HEV platforms.
SI8642EB-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
SI8642EB-AU FAQ
1.How can I place an order for SI8642EB-AU through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8642EB-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 SI8642EB-AU reliable?
The price and inventory of SI8642EB-AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8642EB-AU is usually 5 days.
3.What payment methods are accepted for SI8642EB-AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8642EB-AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8642EB-AU?
SI8642EB-AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8642EB-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 SI8642EB-AU?
For technical support, including SI8642EB-AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8642EB-AU requirements.
6.How does Aetrix verify that SI8642EB-AU is sourced from the original manufacturer or authorized distributors?
All SI8642EB-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 SI8642EB-AU meets industry standards.
7.What is the process for return or replacement of SI8642EB-AU?
All SI8642EB-AU units undergo pre-shipment inspection (PSI). If there is an issue with SI8642EB-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 SI8642EB-AU part is unused and in its original packaging.
Return procedure for SI8642EB-AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8642EB-AU 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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