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Skyworks Solutions Inc. SI8642ED-AS2
- Part No.:
- SI8642ED-AS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8642ED-AS2.pdf
- Description:
- AUTOMOTIVE 5 KV 2 FORWARD & 2 RE
- Quantity:
- Payment:
- Shipping:
Inventory:2,952
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Product details
Overview
SI8642ED-AS2 from Skyworks is a quad-channel digital isolator with 2 input channels on VDD1 side and 2 output channels on VDD2 side, 5 kVRMS reinforced isolation rating, 150 Mbps data rate, and selectable high-default fail-safe mode. It enables robust signal transmission across high-voltage barriers in isolated power supplies and motor control systems.
For engineers reviewing the SI8642ED-AS2 datasheet, SI8642ED-AS2 pinout, SI8642ED-AS2 application, or SI8642ED-AS2 equivalent, this page delivers verified electrical specs, SOIC-16 wide-body package details, fail-safe behavior under power loss, and automotive-grade AEC-Q100 qualification for battery management and traction inverter designs.
Technical Context
The SI8642ED-AS2 uses RF-based on/off keying modulation across a semiconductor isolation barrier-eliminating startup initialization and delivering superior noise immunity versus optocouplers. Its dual enable inputs (EN1, EN2) independently control A3/A4 and B1/B2 outputs, supporting tri-state operation per channel pair.
It features Schmitt-trigger inputs (1.0–1.9 V hysteresis), 50 Ω nominal output impedance, and operates across –40 to +125 °C with stable propagation delay (<13 ns) and <2.5 ns channel-channel skew. Reinforced VDE 0884-10 certification supports 5 kVRMS working voltage and 10 kV surge capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4-channel (2 input / 2 output split across isolation barrier) |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like SPI, RS-485, and isolated ADC/DAC links |
| Isolation Rating | 5 kVRMS reinforced - certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1 |
| Propagation Delay | 5–13 ns - ensures tight timing control in real-time motor control and power converter feedback loops |
| Supply Voltage | 2.375–5.5 V per side - interoperable with 2.5 V, 3.3 V, and 5 V logic domains on both sides |
| Fail-Safe Default | High - outputs drive high during VDD1 loss while VDD2 remains powered, preventing undefined states |
| CMTI | ≥60 kV/µs - maintains signal integrity in noisy high-dv/dt environments like IGBT gate drives |
Pinout & Package
SI8642ED-AS2 is housed in a RoHS-compliant wide-body SOIC-16 package (8 mm creepage, -IS2 variant), rated for 5 kVRMS reinforced insulation and compatible with JEDEC J-STD-020 260 °C reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.375–5.5 V to input-side logic and channel A; UVLO threshold at 2.24 V (typ) |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8 mm creepage for safety compliance |
| A1, A2 | Input signals (Side A) | CMOS-compatible inputs with Schmitt trigger (1.4–1.9 V VT+, 1.0–1.4 V VT−); no external pull-ups needed |
| EN1 | Enable for A3/A4 outputs | Active-high control: drives A3/A4 into high-impedance when low; internally pulled up to VDD2 |
| A3, A4 | Output signals (Side A, driven by EN1) | Isolated outputs mirroring A1/A2 when EN1 = high; default high during VDD1 loss |
| VDD2 | Output-side power supply | Supplies 2.375–5.5 V to output-side logic and channels B/A; independent of VDD1 |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1; defines safety barrier boundary |
| B1, B2 | Output signals (Side B, driven by EN2) | Isolated outputs mirroring A1/A2 when EN2 = high; default high during VDD1 loss |
| EN2 | Enable for B1/B2 outputs | Active-high control: drives B1/B2 into high-impedance when low; internally pulled up to VDD2 |
| NC | No-connect terminal | Not internally connected; may be left floating, tied to VDD2, or grounded per layout requirements |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced 5 kVRMS isolation | Meets VDE 0884-10, UL 1577, and IEC 62368-1 for single-package reinforced insulation in medical and industrial systems |
| Tri-state enable per channel pair | EN1 and EN2 allow independent high-impedance control of A3/A4 and B1/B2 - enabling bus sharing and dynamic signal routing |
| High-default fail-safe mode | Guarantees logic-high outputs on all four channels during input-side power loss - critical for safe shutdown in BMS and inverters |
| Ultra-low power at 100 Mbps | 11 mA per side at 5 V/100 Mbps (typ) - reduces thermal load in compact isolated DC-DC controllers and gate drivers |
| Automotive-grade AEC-Q100 | Qualified to Grade 1 (–40 to +125 °C), with AIAG PPAP support and IMDS/CAMDS compliance for EV traction systems |
Applications
| Motor Control Feedback Isolation | Isolated ADC Interface |
|---|---|
|
Use Scenario: Isolating encoder or resolver feedback signals between motor controller MCU (low-voltage side) and high-power inverter stage (high-voltage side). IC Role / Device Role / Timing Role: SI8642ED-AS2 transmits quadrature A/B and index signals across 5 kVRMS barrier with <13 ns propagation delay and <2.5 ns skew - preserving phase accuracy for FOC algorithms. Use Value: Enables precise rotor position tracking without optical encoder latency or magnetic interference susceptibility, supporting >20 kHz PWM switching in traction inverters. |
Use Scenario: Connecting isolated sigma-delta ADC (e.g., AMC1306) to host processor in high-voltage battery monitoring systems. IC Role / Device Role / Timing Role: SI8642ED-AS2 carries 24-bit modulator bitstream and clock across isolation barrier with 150 Mbps capability and 350 ps peak jitter. Use Value: Maintains ADC effective resolution >16 bits by minimizing timing uncertainty in bitstream sampling - critical for ±0.1% SOC estimation in EV battery packs. |
| On-Board Charger (OBC) Communication | Traction Inverter Gate Drive Interface |
|
Use Scenario: Isolating CAN FD or UART communication between OBC MCU and AC/DC front-end controller operating at 400–800 V DC bus. IC Role / Device Role / Timing Role: SI8642ED-AS2 provides two bidirectional data paths (A1↔B1, A2↔B2) with fail-safe high default - ensuring safe fault reporting during primary-side brownout. Use Value: Prevents false shutdown commands during transient input dips, improving OBC reliability and meeting ISO 11898-2 EMC immunity requirements. |
Use Scenario: Delivering isolated PWM signals from gate driver IC (e.g., UCC5870) to SiC MOSFET half-bridge in 800 V traction inverter modules. IC Role / Device Role / Timing Role: SI8642ED-AS2 routes complementary high-side/low-side gate signals with matched propagation delay (<2 ns skew) and 60 kV/µs CMTI. Use Value: Eliminates shoot-through risk during fast SiC switching (dv/dt > 50 V/ns) while maintaining <100 ns dead-time control precision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM141DARZ | 4-channel, 150 Mbps, 3.75 kVRMS basic isolation; no fail-safe default selection; 25 ns max propagation delay | Lacks reinforced 5 kVRMS rating and automotive qualification; suitable only for non-safety-critical industrial automation | Choose ADUM141DARZ only if system-level reinforcement is handled externally and AEC-Q100 is not required. |
| ISO6742QDWR | 4-channel, 50 Mbps, 5 kVRMS reinforced; fails low by default; 25 ns max propagation delay; no tri-state enable | Lower speed limits use in high-frequency gate drive; fixed low-fail-safe conflicts with BMS fault-signaling logic | Select ISO6742QDWR only for cost-sensitive, lower-speed applications where high-default behavior is not needed. |
Compared with ADUM141DARZ and ISO6742QDWR, SI8642ED-AS2 uniquely combines 150 Mbps speed, 5 kVRMS reinforced certification, high-default fail-safe, and dual tri-state enables - making it the only option qualified for AEC-Q100 automotive traction systems requiring both performance and functional safety.
Availability
SI8642ED-AS2 is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, and traction inverters requiring stable component supply across automotive production lifecycles.
Supply support for SI8642ED-AS2 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 engineered specifically for high-reliability isolation in electric vehicle powertrain systems and industrial automation - emphasizing AEC-Q100 qualification, reinforced safety certification, and ultra-low power at multi-Mbps data rates.
FAQ
What is the isolation rating and safety certification status of SI8642ED-AS2?
SI8642ED-AS2 provides 5 kVRMS reinforced isolation and is certified to VDE 0884-10, UL 1577, CSA Component Notice 5A, IEC 62368-1, and CQC GB4943.1. These certifications validate its suitability for medical, industrial, and automotive applications requiring reinforced insulation - including battery management systems and traction inverters where single-point failure must be prevented. SI8642ED-AS2 meets all requirements for end-equipment standards such as IEC 61000-4-5 and ISO 26262 ASIL-B functional safety architectures.
Does SI8642ED-AS2 support fail-safe operation, and how is it configured?
Yes, SI8642ED-AS2 has a factory-configured high-default fail-safe mode: when VDD1 is unpowered but VDD2 remains active, all four outputs (A3, A4, B1, B2) drive logic high. This behavior is fixed per ordering code "ED" and cannot be changed in-circuit. It eliminates undefined states during input-side brownouts - a critical requirement in automotive battery disconnect logic and isolated fault-reporting circuits. The device does not require external pull-up resistors, as internal 2 µA pull-ups are integrated on all outputs.
What are the enable pin functions on SI8642ED-AS2, and how do they operate?
SI8642ED-AS2 has two independent enable pins: EN1 controls outputs A3 and A4, while EN2 controls outputs B1 and B2. Both are active-high, internally pulled up to VDD2, and drive their respective outputs into high-impedance when low. This allows dynamic bus arbitration and power-gated signal routing without external logic. EN1 and EN2 can be left floating in noise-immune layouts, but Skyworks recommends tying them to VDD2 or GND in high-EMI environments to prevent unintended tri-state transitions.
How does SI8642ED-AS2 perform in high dv/dt environments like SiC or GaN gate drive circuits?
SI8642ED-AS2 achieves ≥60 kV/µs common-mode transient immunity (CMTI), measured at VCM = 1500 V with VI = 0 or VDD. This exceeds the 50 kV/µs minimum required for 800 V SiC inverters operating at >50 V/ns dv/dt. Its RF-based isolation architecture inherently rejects magnetic coupling, and its <2.5 ns channel-channel skew ensures matched timing for complementary PWM signals - directly supporting tight dead-time control and eliminating shoot-through risk in high-frequency gate drive applications.
Is SI8642ED-AS2 qualified for automotive applications, and what documentation is available?
Yes, SI8642ED-AS2 is an automotive-grade part (suffix "-AS2") qualified to AEC-Q100 Grade 1 (–40 to +125 °C), with full AIAG-compliant PPAP documentation, IMDS and CAMDS material declarations, and zero-defect manufacturing flow. It is designed for on-board chargers, battery management systems, and traction inverters in BEV/HEV platforms. Traceability, lot-level test data, and long-term supply commitments are available through Aetrix Electronics for Tier-1 and OEM design-in support.
SI8642ED-AS2 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
SI8642ED-AS2 FAQ
1.How can I place an order for SI8642ED-AS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8642ED-AS2 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 SI8642ED-AS2 reliable?
The price and inventory of SI8642ED-AS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8642ED-AS2 is usually 5 days.
3.What payment methods are accepted for SI8642ED-AS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8642ED-AS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8642ED-AS2?
SI8642ED-AS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8642ED-AS2 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 SI8642ED-AS2?
For technical support, including SI8642ED-AS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8642ED-AS2 requirements.
6.How does Aetrix verify that SI8642ED-AS2 is sourced from the original manufacturer or authorized distributors?
All SI8642ED-AS2 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 SI8642ED-AS2 meets industry standards.
7.What is the process for return or replacement of SI8642ED-AS2?
All SI8642ED-AS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8642ED-AS2, 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 SI8642ED-AS2 part is unused and in its original packaging.
Return procedure for SI8642ED-AS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8642ED-AS2 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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