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Skyworks Solutions Inc. SI8642ET-ASR
- Part No.:
- SI8642ET-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8642ET-ASR.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:1,732
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Product details
Overview
SI8642ET-ASR 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 5 kVRMS reinforced isolation in a wide-body SOIC-16 package. It operates from 2.5–5.5 V supplies, features Schmitt-trigger inputs, tri-state outputs with enable control, and default-high fail-safe mode - used in isolated motor control gate drivers and battery management system signal interfaces.
For engineers reviewing the SI8642ET-ASR datasheet, SI8642ET-ASR pinout, SI8642ET-ASR application, or SI8642ET-ASR equivalent, key selection criteria include its 2:2 channel split, 5 kVRMS VDE 0884-10 reinforced rating, high CMTI (>60 kV/µs), low 11 mA typical supply current at 100 Mbps (5 V), and automotive-grade AEC-Q100 qualification for traction inverter and OBC designs.
Technical Context
The SI8642ET-ASR implements RF-based on/off keying across a silicon dioxide isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its dual-enable architecture (EN1 on Side A, EN2 on Side B) allows independent tri-state control of A3/A4 and B1/B2 output pairs.
It supports fail-safe operation with default-high output state during input-side power loss, meets reinforced insulation per VDE 0884-10 (10 kV surge capable), and maintains stable timing - 0.5 ns channel-channel skew and 2 ns propagation delay skew - across –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 2 input / 2 output (asymmetric bidirectional configuration) |
| Max Data Rate | 150 Mbps - supports high-speed SPI, RS-485, and PWM feedback in inverters |
| Isolation Rating | 5 kVRMS reinforced - certified to VDE 0884-10, enables single-package reinforced barrier in medical and EV systems |
| Propagation Delay | ≤13 ns max - ensures sub-20 ns round-trip latency for real-time gate drive control loops |
| Supply Voltage | 2.5–5.5 V - interoperable with 3.3 V microcontrollers and 5 V analog front-ends |
| CMTI | ≥60 kV/µs - suppresses false triggering in high-dV/dt motor drive environments |
| Fail-Safe Mode | Default-high - guarantees known logic state on B1/B2 during VDD1 brownout in BMS monitoring paths |
Pinout & Package
SI8642ET-ASR uses a RoHS-compliant wide-body SOIC-16 package (7.5 mm creepage, 8.3 mm clearance) with reinforced insulation suitable for 5 kVRMS working voltage. Pin functions are validated per Skyworks Si864x datasheet Section 5 (Pin Descriptions) and Figure 5.1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to input logic and channel transmitter; bypassed with 0.1 µF capacitor |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by isolation barrier |
| A1, A2 | Input signals (Side A) | Accept 2.5–5.5 V logic; Schmitt-trigger inputs reject >0.44 V hysteresis noise |
| EN1 | Enable for A3/A4 outputs | Active-high control: drives A3/A4 into high-impedance when low (used for multiplexing) |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to output drivers and receiver logic |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1 |
| B1, B2 | Output signals (Side B) | Drive 50 Ω loads; default-high during VDD1 undervoltage (fail-safe) |
| EN2 | Enable for B1/B2 outputs | Active-high control: places B1/B2 in high-Z when low - enables shared-bus arbitration |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Silicon dioxide dielectric enables 60-year lifetime at rated voltage and eliminates LED aging concerns of optocouplers |
| Tri-state enable architecture | Dual EN pins (EN1/EN2) allow independent high-impedance control of each 2-channel group for bus sharing |
| Reinforced VDE 0884-10 certification | Validated for 10 kV surge withstand - eliminates need for external transient protection in industrial inverters |
| Ultra-low power at speed | 11 mA per side at 100 Mbps / 5 V - reduces thermal load in sealed automotive ECUs |
| Automotive-grade AEC-Q100 | Qualified to Grade 1 (–40°C to +125°C) with zero-defect manufacturing flow and PPAP support |
Applications
| Motor Control Gate Driver Interface | Isolated Battery Management System |
|---|---|
Use Scenario: Transmitting PWM and fault signals between MCU and high-voltage IGBT/SiC gate drivers in 400–800 V traction inverters. IC Role / Device Role / Timing Role: Isolates control logic from 600 VDC bus while preserving <13 ns propagation delay for precise dead-time management. Use Value: Enables compact, single-package reinforced isolation meeting IEC 60747-17 and UL 1577, reducing BOM count vs. optocoupler + buffer solutions. | Use Scenario: Communicating cell voltage and temperature telemetry from high-side sensing circuitry to MCU in EV battery packs. IC Role / Device Role / Timing Role: Provides 5 kVRMS galvanic separation between 400–1000 V battery strings and low-voltage domain, with default-high fail-safe ensuring safe shutdown on sensor-side power loss. Use Value: Eliminates risk of floating outputs during partial power failure - critical for ASIL-B functional safety compliance in ISO 26262 systems. |
| Industrial PLC Digital I/O Module | Isolated DC-DC Converter Feedback |
Use Scenario: Isolating 24 V digital input signals from field devices (sensors, switches) to 3.3 V PLC controller backplane. IC Role / Device Role / Timing Role: Converts noisy industrial 24 V logic to clean 3.3 V levels with Schmitt-trigger inputs rejecting >0.44 V noise and 60 kV/µs CMTI. Use Value: Reduces false triggers in factory-floor EMI environments - improves MTBF over legacy capacitive isolators. | Use Scenario: Transferring error amplifier output across isolation barrier in isolated flyback or forward converters operating up to 1 MHz switching frequency. IC Role / Device Role / Timing Role: Delivers <5 ns pulse width distortion and 0.5 ns channel skew to preserve feedback loop stability and transient response. Use Value: Maintains tight regulation under dynamic load steps without requiring loop compensation redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM2201ARWZ | 2-channel, 5 kVRMS, 1 Mbps max data rate, no enable pins, 16-pin SOIC wide-body | Limited to low-speed control signaling; lacks tri-state control and fail-safe default state | Select only if data rate ≤1 Mbps and enable functionality is unnecessary |
| ISO6721QDWR | 2-channel, 5 kVRMS, 50 Mbps max, 16-pin SOIC wide-body, AEC-Q100 qualified | Lower bandwidth and no default-high fail-safe; requires external pull-ups for safe state | Choose when cost sensitivity outweighs need for 150 Mbps or deterministic fail-safe behavior |
Compared with ADUM2201ARWZ and ISO6721QDWR, SI8642ET-ASR delivers 3× higher data rate than the former and adds integrated fail-safe logic and dual enable control - critical for real-time motor control and functional safety–aligned BMS architectures.
Availability
SI8642ET-ASR is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for SI8642ET-ASR 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, high-speed digital isolation in automotive, industrial, and medical systems - emphasizing low power, precise timing, and reinforced safety certification.
FAQ
What is the isolation rating and safety certification status of the SI8642ET-ASR?
The SI8642ET-ASR is rated for 5 kVRMS reinforced isolation and certified to VDE 0884-10 (10 kV surge capable), UL 1577, CSA Component Notice 5A, and CQC GB4943.1. It meets IEC 62368-1 and IEC 60601-1 requirements for reinforced insulation, making it suitable for medical and EV applications where dual insulation is mandated.
Does the SI8642ET-ASR support fail-safe operation, and how is it configured?
Yes, the SI8642ET-ASR has a factory-configured default-high fail-safe mode. When VDD1 is unpowered or below UVLO threshold, B1 and B2 outputs remain logic high as long as VDD2 is active. This behavior is fixed per ordering code "ET" and does not require external components or configuration pins.
What are the supply current requirements of the SI8642ET-ASR at 100 Mbps and 5 V operation?
At 100 Mbps and 5 V supply, the SI8642ET-ASR draws 11 mA per side (VDD1 and VDD2) under typical conditions with 15 pF load. This value is confirmed in Table 4.2 of the Si864x datasheet for Si8642Bx/Ex variants, which includes SI8642ET-ASR.
Can the SI8642ET-ASR be used in automotive applications, and what qualifications does it hold?
Yes, SI8642ET-ASR is an automotive-grade part qualified to AEC-Q100 Grade 1 (–40°C to +125°C), manufactured using full automotive process flows with AIAG-compliant PPAP documentation, IMDS/CAMDS listings, and zero-defect methodology - validated for on-board chargers and traction inverters.
How does the enable pin functionality work on the SI8642ET-ASR?
The SI8642ET-ASR has two independent enable pins: EN1 controls A3/A4 outputs (Side A), and EN2 controls B1/B2 outputs (Side B). When asserted high, outputs follow input states; when low, outputs enter high-impedance - enabling bus sharing and power-gating without external MOSFETs.
SI8642ET-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-ASR FAQ
1.How can I place an order for SI8642ET-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8642ET-ASR 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-ASR reliable?
The price and inventory of SI8642ET-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8642ET-ASR is usually 5 days.
3.What payment methods are accepted for SI8642ET-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8642ET-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8642ET-ASR?
SI8642ET-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8642ET-ASR 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-ASR?
For technical support, including SI8642ET-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8642ET-ASR requirements.
6.How does Aetrix verify that SI8642ET-ASR is sourced from the original manufacturer or authorized distributors?
All SI8642ET-ASR 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-ASR meets industry standards.
7.What is the process for return or replacement of SI8642ET-ASR?
All SI8642ET-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8642ET-ASR, 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-ASR part is unused and in its original packaging.
Return procedure for SI8642ET-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8642ET-ASR 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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