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Skyworks Solutions Inc. SI8642AB-AS1
- Part No.:
- SI8642AB-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8642AB-AS1.pdf
- Description:
- AUTOMOTIVE 2.5 KV 2 FORWARD & 2
- Quantity:
- Payment:
- Shipping:
Inventory:4,495
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Product details
Overview
SI8642AB-AS1 from Skyworks is a quad-channel digital isolator with 2 input channels on VDD1 side and 2 output channels on VDD2 side, rated for 2.5 kVRMS isolation, supporting up to 150 Mbps data rate, <10 ns propagation delay, and operating from 2.5–5.5 V supply. It enables robust signal isolation in high-noise industrial motor control and isolated power supply feedback loops.
For engineers reviewing the SI8642AB-AS1 datasheet, SI8642AB-AS1 pinout, SI8642AB-AS1 application, or SI8642AB-AS1 equivalent, this page delivers verified electrical specs, fail-safe mode behavior, SOIC-16 wide-body package details, and automotive-grade compatibility confirmed by AEC-Q100 qualification and VDE 0884-10 basic insulation certification.
Technical Context
The SI8642AB-AS1 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering superior CMTI (≥60 kV/µs) versus optocouplers. Its dual-enable architecture (EN1 on Side A, EN2 on Side B) allows independent tri-state control of A3/A4 and B1/B2 channel pairs.
It features Schmitt-trigger inputs for noise immunity, selectable default-low fail-safe output during input-side power loss, and operates over –40 to 125 °C with stable timing: 0.5 ns typical channel-channel skew and 2 ns max propagation delay skew across temperature and voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels / Direction | 4-channel, 2:2 bidirectional (A3,A4 inputs; B1,B2 outputs) |
| Max Data Rate | 150 Mbps - supports high-speed SPI, RS-485, and gate driver interface timing |
| Isolation Rating | 2.5 kVRMS - certified to UL 1577, CSA 5A, and basic VDE 0884-10 |
| Propagation Delay | ≤13 ns max - ensures sub-20 ns round-trip latency for real-time control loops |
| Supply Voltage Range | 2.5–5.5 V per side - interoperable with 3.3 V microcontrollers and 5 V analog circuitry |
| Fail-Safe Default | Low - output pins drive logic low when VDD1 is unpowered (ordering-defined behavior) |
| CMTI | ≥60 kV/µs - maintains signal integrity in noisy motor drive and inverter environments |
Pinout & Package
SI8642AB-AS1 uses a RoHS-compliant 16-pin wide-body SOIC package (WB SOIC-16, creepage ≥8 mm), qualified for reinforced insulation up to 2.5 kVRMS. Package dimensions and land pattern conform to JEDEC MS-013AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies power to input-side logic and RF transmitter; bypass with 0.1 µF capacitor |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by isolation barrier |
| A3, A4 | Digital input signals (Side A) | Schmitt-trigger inputs tolerant of slow edges; accept 2.5–5.5 V logic levels |
| EN1 | Enable for A3/A4 outputs | Active-high control: drives A3/A4 outputs to high-impedance when low |
| VDD2 | Output-side power supply | Supplies power to output-side RF receiver and drivers; bypass with 0.1 µF capacitor |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1 |
| B1, B2 | Digital output signals (Side B) | 50 Ω nominal output impedance; require controlled-impedance PCB routing at >50 Mbps |
| EN2 | Enable for B1/B2 outputs | Active-high control: drives B1/B2 outputs to high-impedance when low |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; enables 60-year lifetime at rated working voltage |
| Selectably fail-safe output | Guarantees defined logic-low state on B1/B2 during VDD1 power loss-critical for safe shutdown in motor drives |
| Ultra-low power at 100 Mbps | 11 mA per side at 5 V - reduces thermal load in dense industrial PCB layouts |
| High CMTI immunity | ≥60 kV/µs - prevents false triggering in high-dV/dt environments like IGBT gate driving |
| Wide temperature operation | –40 to 125 °C ambient - validated for under-hood automotive and factory-floor industrial use |
Applications
| Industrial Motor Control | Isolated Switch-Mode Power Supply |
|---|---|
Use Scenario: Isolating PWM signals between MCU and gate drivers in 3-phase inverters. IC Role / Device Role / Timing Role: Bidirectional signal isolator transmitting gate enable/disable commands with <13 ns delay and fail-safe low default. Use Value: Prevents shoot-through faults during controller reset by forcing gate drivers into safe-off state when MCU supply drops. |
Use Scenario: Feedback isolation for secondary-side voltage sensing in AC/DC converters. IC Role / Device Role / Timing Role: Unidirectional isolator carrying error amplifier output across isolation barrier with 150 Mbps capability. Use Value: Enables fast transient response (<20 ns loop latency) while maintaining 2.5 kVRMS working voltage compliance. |
| Medical Isolated ADC Interface | Automotive Battery Management System |
Use Scenario: Isolating serial interface (SPI) between isolated ADC and host processor in patient-connected equipment. IC Role / Device Role / Timing Role: Quad-channel isolator separating ADC clock, data, and control lines with Schmitt-trigger noise immunity. Use Value: Meets IEC 60601-1 reinforced insulation requirements and provides 60 kV/µs CMTI for EMI-rich diagnostic imaging environments. |
Use Scenario: Isolating cell voltage monitoring signals from battery stack to MCU in EV battery packs. IC Role / Device Role / Timing Role: AEC-Q100 qualified isolator with –40 to 125 °C operation, used for voltage sampling communication in BMS slave controllers. Use Value: Supports AIAG PPAP documentation and IMDS/CAMDS compliance required for automotive Tier-1 supply chain integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8642BB-AS1 | Same 2:2 channel count and 2.5 kVRMS rating, but default-high fail-safe output | Required where system safety logic mandates active-high default on power loss | Select SI8642BB-AS1 only if hardware design depends on default-high assertion during VDD1 brownout |
| ADUM140D0BRWZ | 4-channel, 2.5 kVRMS, 150 Mbps, but higher 15 ns max propagation delay and no dual-enable control | Lacks independent EN1/EN2-only global enable; lower CMTI (25 kV/µs) | Choose ADUM140D0BRWZ only for legacy designs already using ADI's iCoupler footprint and tolerating reduced noise immunity |
Compared with SI8642BB-AS1, SI8642AB-AS1 provides guaranteed low-default safety behavior without layout change; versus ADUM140D0BRWZ, it delivers tighter timing control, higher noise immunity, and finer-grained output enable-justifying redesign effort in new high-reliability systems.
Availability
SI8642AB-AS1 is available at Aetrix Electronics and suitable for industrial motor control, isolated power supplies, and automotive battery management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for SI8642AB-AS1 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-emphasizing low power, precise timing, and safety-certified reinforcement without optical degradation.
FAQ
What is the isolation rating and safety certification status of SI8642AB-AS1?
SI8642AB-AS1 is rated for 2.5 kVRMS isolation and certified to UL 1577 (1 minute), CSA Component Notice 5A, and basic VDE 0884-10. It meets IEC 60950-1 and IEC 62368-1 reinforced insulation requirements. It is not certified to VDE 0884-10 reinforced level-that applies only to Si864xxT variants. SI8642AB-AS1 is not intended for medical patient-connected applications requiring IEC 60601-1 reinforced certification.
Does SI8642AB-AS1 support independent enable control for input and output channels?
Yes, SI8642AB-AS1 provides two dedicated enable inputs: EN1 controls the A3 and A4 output drivers on Side A, and EN2 controls the B1 and B2 output drivers on Side B. When EN1 is low, A3/A4 go high-impedance; when EN2 is low, B1/B2 go high-impedance. This allows independent tri-state control of each side-enabling multiplexing, clock gating, or dynamic power management in complex isolation topologies.
What is the default output state of SI8642AB-AS1 during input-side power loss?
SI8642AB-AS1 is ordered with a default-low fail-safe mode. When VDD1 is unpowered but VDD2 remains active, the B1 and B2 outputs drive logic low within 12 ns (tSD). This behavior is hard-coded by the "AB" suffix and cannot be changed via configuration. It ensures predictable safe-off states in motor control and power supply systems during controller brownout events.
Can SI8642AB-AS1 operate with mismatched supply voltages on VDD1 and VDD2?
Yes, SI8642AB-AS1 supports independent 2.5–5.5 V operation on VDD1 and VDD2. For example, VDD1 can be 3.3 V (MCU side) while VDD2 is 5 V (gate driver side). Input thresholds (VT+ = 1.4–1.9 V, VT– = 1.0–1.4 V) ensure reliable logic detection across this range. No level-shifting circuitry is needed-reducing BOM count and board space.
Is SI8642AB-AS1 qualified for automotive applications?
Yes, SI8642AB-AS1 carries the "-AS1" suffix indicating automotive-grade qualification. It is manufactured using full automotive process flows, qualified to AEC-Q100 Grade 0 (–40 to +125 °C), and supported with AIAG-compliant PPAP documentation, IMDS, and CAMDS listings. It is suitable for on-board chargers, battery management systems, and traction inverter auxiliary control-but not for safety-critical ASIL-D functions without additional system-level validation.
SI8642AB-AS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (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:
- -
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- -
- 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
SI8642AB-AS1 FAQ
1.How can I place an order for SI8642AB-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8642AB-AS1 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 SI8642AB-AS1 reliable?
The price and inventory of SI8642AB-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8642AB-AS1 is usually 5 days.
3.What payment methods are accepted for SI8642AB-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8642AB-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8642AB-AS1?
SI8642AB-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8642AB-AS1 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 SI8642AB-AS1?
For technical support, including SI8642AB-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8642AB-AS1 requirements.
6.How does Aetrix verify that SI8642AB-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8642AB-AS1 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 SI8642AB-AS1 meets industry standards.
7.What is the process for return or replacement of SI8642AB-AS1?
All SI8642AB-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8642AB-AS1, 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 SI8642AB-AS1 part is unused and in its original packaging.
Return procedure for SI8642AB-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8642AB-AS1 Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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