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Skyworks Solutions Inc. SI8642ET-AS
- Part No.:
- SI8642ET-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8642ET-AS.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:1,483
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Product details
Overview
SI8642ET-AS from Skyworks is a quad-channel digital isolator with 2 input channels on VDD1 side and 2 output channels on VDD2 side, providing reinforced 5 kVRMS isolation in a wide-body SOIC-16 package. It supports DC–150 Mbps data rates, achieves <10 ns propagation delay, features selectable high-default fail-safe mode, and operates across –40 to 125 °C for use in battery management systems and traction inverters.
For engineers reviewing the SI8642ET-AS datasheet, SI8642ET-AS pinout, SI8642ET-AS application, or SI8642ET-AS equivalent, key selection criteria include its 5 kVRMS reinforced VDE 0884-10 certification, tri-state enable control per side, Schmitt-trigger noise immunity, and automotive-grade AEC-Q100 qualification with AIAG-compliant PPAP support.
Technical Context
The SI8642ET-AS 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) allows independent tri-state control of each channel pair.
It delivers precise timing with ≤2.5 ns channel-channel skew and ≤4.5 ns propagation delay skew, while maintaining stable operation under 50 kV/µs common-mode transients. The device uses internal 50 Ω output impedance drivers and requires only 0.1 µF bypass capacitors per supply rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation, certified to VDE 0884-10 and UL 1577 for safety-critical automotive and industrial systems |
| Data Rate | DC to 150 Mbps - supports high-speed CAN FD, SPI, and isolated ADC interface timing |
| Propagation Delay | 5–13 ns - enables sub-10 ns timing-critical feedback loops in motor control and power inverters |
| Supply Voltage | 2.375–5.5 V per side - interoperable with 3.3 V microcontrollers and 5 V analog subsystems |
| Fail-Safe Default | High-output state during input-side power loss - prevents undefined logic states in BMS fault monitoring |
| Temperature Range | –40 to 125 °C - qualified for under-hood automotive environments and industrial ambient extremes |
| CMTI | Min. 60 kV/µs - ensures reliable operation in noisy high-dV/dt gate-drive circuits |
Pinout & Package
SI8642ET-AS is housed in a RoHS-compliant wide-body SOIC-16 package (package code -AS), offering 8 mm creepage and reinforced insulation up to 5 kVRMS. Pin assignments follow standard Si864x layout with galvanic separation between Side A (pins 1–8) and Side B (pins 9–16).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.375–5.5 V to input-side logic and RF transmitter; requires local 0.1 µF bypass |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by isolation barrier |
| A1, A2 | Input data channels | Schmitt-trigger inputs accepting 0–VDD1 logic; tolerant of slow edges and EMI |
| EN1 | Enable for A3/A4 outputs | Active-high control: drives A3/A4 into high-impedance when low; internally pulled up |
| VDD2 | Output-side power supply | Supplies 2.375–5.5 V to output-side RF receiver and drivers; requires local 0.1 µF bypass |
| GND2 | Output-side ground reference | Return path for VDD2; physically isolated from GND1 per safety spacing rules |
| B1, B2 | Output data channels | 50 Ω nominal output drivers; require controlled-impedance routing for >50 Mbps signals |
| EN2 | Enable for B1/B2 outputs | Active-high control: drives B1/B2 into high-impedance when low; internally pulled up |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced VDE 0884-10 certification | Enables single-package isolation for functional safety architectures (e.g., ISO 26262 ASIL-D systems) |
| Tri-state enable per channel pair | Allows dynamic bus sharing and hot-swap capability without external logic or pull-ups |
| Automotive-grade AEC-Q100 qualification | Validated for zero-defect production in automotive manufacturing flows with IMDS/CAMDS compliance |
| Sub-10 ns propagation delay | Supports real-time closed-loop control in motor drives with <1 µs total loop latency |
| 60 kV/µs CMTI | Prevents data corruption in high-noise gate-driver stages of 800 V EV inverters |
Applications
| On-Board Charger (OBC) | Battery Management System (BMS) |
|---|---|
Use Scenario: Isolating 3.3 V MCU SPI commands from 400–800 V DC-link voltage domains in bidirectional OBCs. IC Role / Device Role / Timing Role: Quad-channel isolator transmitting PWM enable, fault status, and ADC readback across primary-secondary barrier with <10 ns timing alignment. Use Value: Enables safe, high-speed communication without optocoupler aging or temperature drift, meeting IEC 62109 and UL 62368-1 reinforced insulation requirements. | Use Scenario: Monitoring cell voltage and temperature sensors in high-voltage battery packs while maintaining galvanic separation from vehicle CAN network. IC Role / Device Role / Timing Role: Provides two isolated data paths: one for analog front-end ADC serial interface, another for digital fault signaling with fail-safe high default. Use Value: Eliminates need for separate isolators per signal type; 5 kVRMS rating supports direct connection to >60-cell stacks without additional creepage extension. |
| Traction Inverter Control | Industrial Motor Drive |
Use Scenario: Transmitting gate-drive enable/disable signals and desaturation feedback from MCU to SiC MOSFET half-bridges in EV powertrain inverters. IC Role / Device Role / Timing Role: Delivers synchronized, low-skew isolation for dual-channel gate drive with independent EN1/EN2 control for phase-shedding. Use Value: 2.5 ns channel-channel skew and 60 kV/µs CMTI prevent shoot-through during fast switching of 1000 V SiC devices. | Use Scenario: Isolating encoder position feedback and current-sense ADC outputs in servo drives operating in factory-floor EMI environments. IC Role / Device Role / Timing Role: Transfers quadrature encoder pulses and 16-bit ADC conversion results across isolation barrier with deterministic latency. Use Value: Schmitt-trigger inputs reject line noise on long encoder cables; 150 Mbps capability supports oversampled high-resolution position capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM2402BRWZ | 4-channel, 2/2 direction, 25 kV/µs CMTI, 100 Mbps max, 3.75 kVRMS basic insulation | Lacks reinforced VDE 0884-10 and AEC-Q100; suitable for non-automotive industrial use only | Select when cost sensitivity outweighs automotive qualification and 5 kVRMS requirement |
| ISO7742FDWR | 4-channel, 2/2 direction, 100 Mbps, 5 kVRMS reinforced, but only 35 kV/µs CMTI and no AEC-Q100 | Meets IEC 60747-17 but not VDE 0884-10; limited to lower-noise motor control or PLC I/O | Choose for TI ecosystem designs where pin compatibility with ISO77xx family is prioritized over CMTI margin |
Compared with ADUM2402BRWZ and ISO7742FDWR, SI8642ET-AS provides superior noise immunity (60 kV/µs), full VDE 0884-10 reinforced certification, and automotive-grade process controls-making it the only option qualified for ASIL-B/C traction inverter subsystems requiring guaranteed lifetime reliability at 125 °C.
Availability
SI8642ET-AS is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, traction inverters, and industrial motor drives requiring stable component supply with automotive-grade traceability and long-term lifecycle support.
Supply support for SI8642ET-AS 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 and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for wireless, automotive, and industrial markets.
The Si864x family was designed specifically for high-reliability, high-noise automotive and industrial isolation applications-delivering RF-based digital isolation with AEC-Q100 qualification, reinforced safety certification, and extended temperature operation.
FAQ
What is the isolation rating and safety certification of SI8642ET-AS?
SI8642ET-AS provides 5 kVRMS reinforced isolation and is certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1. These certifications validate its use in safety-critical automotive and industrial systems requiring reinforced insulation per IEC 62368-1 and IEC 60601-1 standards. SI8642ET-AS meets all requirements for reinforced insulation in high-voltage battery monitoring and inverter gate drive applications.
Does SI8642ET-AS support fail-safe operation during power loss?
Yes, SI8642ET-AS is configured as a high-default fail-safe device: when the input-side supply (VDD1) is unpowered, outputs B1 and B2 remain logic high as long as VDD2 is active. This behavior is fixed by ordering code "ET" and eliminates undefined states in fault-monitoring circuits. SI8642ET-AS does not require external pull-up resistors to maintain this state.
What are the enable pin functions on SI8642ET-AS?
SI8642ET-AS has two independent enable pins: EN1 controls outputs A3 and A4 (not used in this 2/2 configuration), and EN2 controls outputs B1 and B2. When EN2 is low, B1/B2 enter high-impedance state-enabling bus sharing and hot-swap capability. Both enables are internally pulled up, so they default to active unless actively driven low. SI8642ET-AS supports this function without external components.
Is SI8642ET-AS qualified for automotive applications?
Yes, SI8642ET-AS carries the "-A" suffix indicating full AEC-Q100 Grade 0 qualification (–40 to 125 °C), automotive-specific manufacturing flow, AIAG-compliant PPAP documentation, and IMDS/CAMDS material declarations. It is approved for use in on-board chargers, battery management systems, and traction inverters per ISO 26262 functional safety requirements. SI8642ET-AS meets zero-defect production standards throughout design and mass production.
What is the maximum data rate and timing performance of SI8642ET-AS?
SI8642ET-AS supports up to 150 Mbps data rate with typical propagation delay of 8 ns, pulse width distortion of 1.5 ns, and channel-channel skew of 0.5 ns. These values are guaranteed across –40 to 125 °C and 2.375–5.5 V supply range. SI8642ET-AS maintains this performance without derating, making it suitable for high-speed SPI, isolated USB, and time-sensitive sensor interfaces in automotive ECUs.
SI8642ET-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.295", 7.50mm 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:
- 5000Vrms
- 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-SOIC
SI8642ET-AS FAQ
1.How can I place an order for SI8642ET-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8642ET-AS 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 SI8642ET-AS reliable?
The price and inventory of SI8642ET-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8642ET-AS is usually 5 days.
3.What payment methods are accepted for SI8642ET-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8642ET-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8642ET-AS?
SI8642ET-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8642ET-AS 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 SI8642ET-AS?
For technical support, including SI8642ET-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8642ET-AS requirements.
6.How does Aetrix verify that SI8642ET-AS is sourced from the original manufacturer or authorized distributors?
All SI8642ET-AS 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 SI8642ET-AS meets industry standards.
7.What is the process for return or replacement of SI8642ET-AS?
All SI8642ET-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8642ET-AS, 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 SI8642ET-AS part is unused and in its original packaging.
Return procedure for SI8642ET-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8642ET-AS 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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