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Skyworks Solutions Inc. SI8642EA-AU
- Part No.:
- SI8642EA-AU
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8642EA-AU.pdf
- Description:
- AUTOMOTIVE 1 KV 2 FORWARD & 2 RE
- Quantity:
- Payment:
- Shipping:
Inventory:2,251
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Product details
Overview
SI8642EA-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 1 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 SI8642EA-AU datasheet, SI8642EA-AU pinout, SI8642EA-AU application, or SI8642EA-AU equivalent, key selection criteria include channel directionality (2:2), fail-safe default-high behavior, QSOP-16 footprint compatibility, and AEC-Q100 qualification for automotive BMS and traction inverter subsystems.
Technical Context
The SI8642EA-AU implements RF-based on/off keying across a silicon-die isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its dual enable inputs (EN1 on Side A, EN2 on Side B) allow independent tri-state control of A3/A4 and B1/B2 outputs respectively.
It operates across 2.5–5.5 V supply range per side, maintains stable timing over –40 to +125 °C, and delivers <4.6 mA per side at 100 Mbps (5 V), with precise skew control: ≤2.5 ns channel-to-channel skew and ≤4.5 ns propagation delay skew between units.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | DC to 150 Mbps - supports high-speed SPI, RS-485 transceiver control, and real-time ADC sampling clock isolation. |
| Propagation Delay | 5.0–13 ns - enables tight-timing loop closure in motor gate driver feedback paths. |
| Channel Configuration | 2 inputs / 2 outputs - matches bidirectional communication needs in isolated half-bridge drivers and dual-sensor interfaces. |
| Fail-Safe Default | High - ensures safe logic-high state on isolated outputs during VDD1 loss (e.g., primary-side power fault). |
| Isolation Rating | 1.0 kV RMS - certified to UL 1577 and CSA 5A for basic insulation in non-reinforced industrial subsystems. |
| Supply Range | 2.5–5.5 V per side - interoperable with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| CMTI | ≥35 kV/µs - suppresses false triggering in high-dV/dt environments like IGBT switching nodes. |
Pinout & Package
SI8642EA-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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to input logic and RF transmitter; bypass capacitor required. |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by isolation barrier. |
| A1, A2 | Input data channels | Digital signals entering isolation barrier; Schmitt-trigger inputs tolerate slow edges and noise. |
| EN1 | Enable for A3/A4 outputs | Active-high control: drives A3/A4 into high-impedance when low - enables multiplexing or power-gating. |
| A3, A4 | Output channels (Side A) | Isolated outputs referenced to VDD1; default-high during VDD1 loss per fail-safe ordering option. |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to RF receiver and output drivers; independent of VDD1. |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1. |
| B1, B2 | Output channels (Side B) | Isolated outputs referenced to VDD2; controlled by EN2 (pin 15). |
| EN2 | Enable for B1/B2 outputs | Active-high control: disables B1/B2 into high-Z - allows dynamic output isolation in safety-critical paths. |
| NC | No-connect terminal | Not internally bonded; may be left floating, tied to VDD2, or grounded per layout requirements. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift; enables >60-year lifetime at rated working voltage. |
| Selectably high-default fail-safe mode | Guarantees logic-high output during VDD1 undervoltage or loss - critical for enabling safe shutdown in BMS fault detection. |
| Independent dual-enable control (EN1/EN2) | Allows selective tri-state of A3/A4 and B1/B2 without affecting other channels - supports dynamic reconfiguration in multi-inverter systems. |
| Ultra-low power at 100 Mbps | 11 mA per side (5 V) - reduces thermal load in sealed automotive enclosures and extends battery runtime in portable test equipment. |
| High CMTI (≥35 kV/µs) | Prevents metastability during fast common-mode transients in motor drive half-bridges and DC-DC converter switching nodes. |
Applications
| Motor Control Feedback | Automotive Battery Management |
|---|---|
Use Scenario: Isolating current-sense amplifier outputs and PWM gate driver status signals in 3-phase inverter stacks. IC Role / Device Role / Timing Role: Bidirectional signal isolator providing 2:2 channel mapping between MCU and isolated gate drivers, with sub-10 ns propagation delay preserving timing integrity. Use Value: Enables precise dead-time control and overcurrent response within <100 ns, meeting IEC 61800-5-1 functional safety timing constraints. | Use Scenario: Transmitting cell voltage and temperature readings from high-voltage battery packs to isolated MCU in EV battery management systems. IC Role / Device Role / Timing Role: High-reliability digital isolator with AEC-Q100 qualification and default-high fail-safe behavior ensuring safe open-circuit reporting during sensor-side power loss. Use Value: Maintains diagnostic continuity during partial power faults, reducing false-positive fault triggers and extending system uptime. |
| Isolated ADC Interface | Industrial PLC I/O Module |
Use Scenario: Coupling isolated sigma-delta ADC outputs (e.g., AD7403) to host processor in high-voltage energy metering systems. IC Role / Device Role / Timing Role: Low-jitter (350 ps peak), high-CMTI isolator preserving 16-bit ADC timing accuracy across 150 Mbps serial streams. Use Value: Prevents quantization error from isolation-induced jitter, enabling Class 0.2 metering compliance without post-processing correction. | Use Scenario: Isolating digital input/output lines between field-side sensors/actuators and controller-side logic in modular PLC backplanes. IC Role / Device Role / Timing Role: Quad-channel isolator with independent enable pins allowing hot-swap I/O module detection and graceful channel disable during insertion/removal. Use Value: Eliminates bus contention and transient coupling during live module replacement, improving system availability in continuous-process plants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8642BA-AU | Same package and pinout; default output state is low instead of high. | Suitable where fail-safe logic-low is required (e.g., disabling gate drivers on fault). | Select SI8642BA-AU when system safety logic mandates active-low default signaling. |
| ISO6742QDWR | TI part in SOIC-16 wide-body; 5 kV RMS isolation; no selectable fail-safe mode (fixed default). | Used where reinforced insulation and higher creepage are mandatory (e.g., medical mains-connected devices). | Choose ISO6742QDWR only if 5 kV isolation and VDE 0884-10 reinforced certification are required - not a drop-in replacement. |
Compared with SI8642BA-AU, SI8642EA-AU provides guaranteed high-default behavior essential for fail-safe enable paths; versus ISO6742QDWR, it offers lower power, smaller QSOP footprint, and configurable fail-safe mode - but lacks reinforced insulation for mains-connected applications.
Availability
SI8642EA-AU is available at Aetrix Electronics and suitable for automotive battery management systems, motor control feedback loops, and isolated ADC interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SI8642EA-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, low-power digital isolation in automotive and industrial systems - emphasizing AEC-Q100 qualification, long-term stability, and noise-immune RF modulation.
FAQ
What is the default output state of SI8642EA-AU during input-side power loss?
The SI8642EA-AU is ordered with "EA" suffix indicating high-default fail-safe mode: when VDD1 is unpowered but VDD2 remains active, outputs A3 and A4 default to logic high. This behavior is factory-configured and does not require external pull-ups. SI8642EA-AU maintains this state within 12 ns after VDD1 collapse, as specified in Table 3.1 of the datasheet.
Does SI8642EA-AU support independent enable control for all four channels?
Yes. SI8642EA-AU provides two dedicated enable inputs: EN1 (pin 3) controls A3 and A4 outputs, while EN2 (pin 15) controls B1 and B2 outputs. Each enable input places its respective pair into high-impedance state when driven low. SI8642EA-AU does not support per-channel enable - only grouped 2-channel control as defined in Table 3.2.
What is the maximum data rate supported by SI8642EA-AU, and under what conditions is it guaranteed?
SI8642EA-AU supports up to 150 Mbps maximum data rate, verified across –40 to +125 °C ambient temperature with 2.5–5.5 V supplies and 15 pF capacitive load per output. This rating applies to all four channels simultaneously and is validated per Figure 2.3 (Eye Diagram) and Table 4.2 timing specifications in the official Skyworks datasheet for SI8642EA-AU.
Is SI8642EA-AU qualified for automotive applications, and what certifications does it hold?
Yes. SI8642EA-AU carries the "-AU" suffix denoting Automotive Grade qualification per AEC-Q100 Rev G, with full automotive process flow, PPAP documentation, and IMDS/CAMDS compliance. It holds UL 1577 (1 kV RMS), CSA Component Acceptance Notice 5A, and IEC 60950-1 basic insulation certifications - but not VDE 0884-10 reinforced, as its isolation rating is 1.0 kV RMS.
What package type and footprint does SI8642EA-AU use, and are there layout considerations?
SI8642EA-AU uses a 16-pin QSOP package (5.3 mm × 10.2 mm, 1.0 mm height) with 0.635 mm pitch. Layout requires separate ground planes for GND1 and GND2, minimum 5.5 mm creepage across the isolation barrier, and 0.1 µF bypass capacitors placed within 2 mm of VDD1/GND1 and VDD2/GND2 pins. SI8642EA-AU's QSOP footprint is incompatible with SOIC-16 land patterns.
SI8642EA-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
SI8642EA-AU FAQ
1.How can I place an order for SI8642EA-AU through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8642EA-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 SI8642EA-AU reliable?
The price and inventory of SI8642EA-AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8642EA-AU is usually 5 days.
3.What payment methods are accepted for SI8642EA-AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8642EA-AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8642EA-AU?
SI8642EA-AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8642EA-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 SI8642EA-AU?
For technical support, including SI8642EA-AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8642EA-AU requirements.
6.How does Aetrix verify that SI8642EA-AU is sourced from the original manufacturer or authorized distributors?
All SI8642EA-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 SI8642EA-AU meets industry standards.
7.What is the process for return or replacement of SI8642EA-AU?
All SI8642EA-AU units undergo pre-shipment inspection (PSI). If there is an issue with SI8642EA-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 SI8642EA-AU part is unused and in its original packaging.
Return procedure for SI8642EA-AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8642EA-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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