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Skyworks Solutions Inc. SI8642BC-AS1
- Part No.:
- SI8642BC-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8642BC-AS1.pdf
- Description:
- AUTOMOTIVE 3.75 KV 2 FORWARD & 2
- Quantity:
- Payment:
- Shipping:
Inventory:4,233
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Product details
Overview
SI8642BC-AS1 from Skyworks is a quad-channel digital isolator with 2 input channels on VDD1 side and 2 output channels on VDD2 side, providing reinforced 3.75 kVRMS isolation in a narrow-body SOIC-16 package. It supports DC–150 Mbps data rates, achieves ≤13 ns propagation delay, features Schmitt-trigger inputs for noise immunity, and operates across –40 to 125 °C for industrial motor control and isolated power supply monitoring.
For engineers reviewing the SI8642BC-AS1 datasheet, SI8642BC-AS1 pinout, SI8642BC-AS1 application, or SI8642BC-AS1 equivalent, key selection criteria include its 2:2 channel split, fail-safe low-default output state, 3.75 kVRMS isolation rating, and compatibility with 2.5–5.5 V dual supplies in space-constrained industrial designs.
Technical Context
The SI8642BC-AS1 implements RF-based on/off keying across a silicon-die isolation barrier-eliminating startup initialization and enabling robust noise immunity without optical components. Its architecture delivers precise timing with ≤4.5 ns channel-to-channel skew and ≤2 ns propagation delay skew between channels.
It integrates independent undervoltage lockout (UVLO) monitors per side (VDD1/VDD2), supports tri-state outputs via two dedicated enable inputs (EN1/EN2), and uses Schmitt-trigger inputs with 0.44 V typical hysteresis to reject fast transients up to 50 kV/µs common-mode slew rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3.75 kVRMS reinforced insulation - meets IEC 62368-1 and UL 1577 for safety-critical industrial interfaces. |
| Max Data Rate | 150 Mbps - enables high-speed serial communication (e.g., SPI, RS-485 isolated PHY) without signal degradation. |
| Propagation Delay | 5–13 ns - ensures tight timing alignment in real-time control loops such as motor gate driver feedback. |
| Supply Voltage Range | 2.5–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V analog subsystems. |
| Channel Configuration | 2 inputs / 2 outputs - matches bidirectional control signal isolation needs (e.g., PWM + fault feedback in inverters). |
| Fail-Safe Default | Low output during power loss - prevents unintended activation of downstream drivers or relays in fault conditions. |
| Operating Temperature | –40 to 125 °C - qualified for under-hood automotive auxiliary systems and industrial PLC backplanes. |
Pinout & Package
Narrow-body SOIC-16 (NB SOIC-16) package with 1.27 mm pitch, RoHS-compliant, JEDEC-standard reflow profile (260 °C peak), and 8.0 mm creepage/clearance compliant with reinforced insulation requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies power to input logic and channel transmitter; requires 0.1 µF bypass capacitor to GND1. |
| GND1 | Input-side ground reference | Return path for VDD1; must be physically separated from GND2 by ≥8 mm creepage for safety compliance. |
| IN1, IN2 | Digital input signals | Schmitt-trigger buffered inputs accepting 2.0–5.5 V logic; tolerate ±10 µA leakage at full temperature range. |
| EN1 | Enable for outputs A3/A4 | Active-high control: drives A3/A4 into high-impedance when low; internally pulled up to VDD2. |
| VDD2 | Output-side power supply | Supplies power to output drivers and receiver; requires separate 0.1 µF bypass capacitor to GND2. |
| GND2 | Output-side ground reference | Isolated return for VDD2; forms galvanic barrier with GND1; critical for CMTI performance. |
| OUT1, OUT2 | Isolated digital outputs | 50 Ω nominal output impedance; drive 15 pF loads with ≤4 ns rise/fall times at 150 Mbps. |
| EN2 | Enable for outputs B1/B2 | Active-high control: disables B1/B2 into high-Z when low; independent of EN1 for flexible channel gating. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; enables stable 60-year lifetime at rated voltage. |
| Selectable fail-safe mode | Factory-configured low-default output ensures safe deactivation of power stages during brownout or startup. |
| Tri-state outputs with dual enables | EN1 and EN2 independently disable A3/A4 and B1/B2 outputs-enabling dynamic bus sharing in multi-master systems. |
| High CMTI immunity | 60 kV/µs minimum common-mode transient immunity prevents data corruption in noisy motor drive environments. |
| Ultra-low power at 1 Mbps | 1.8 mA per side at 5 V (typical) - reduces thermal load in sealed enclosures and extends battery life in portable test equipment. |
Applications
| Industrial Motor Control | Isolated Power Supply Monitoring |
|---|---|
Use Scenario: Isolating PWM gate drive signals and current-sense feedback between MCU and IGBT half-bridge in servo drives. IC Role / Device Role / Timing Role: Bidirectional signal isolator with 2:2 channel mapping, enabling simultaneous PWM transmission and fault reporting across isolation barrier. Use Value: ≤13 ns propagation delay preserves timing integrity in 20 kHz switching applications; 3.75 kVRMS rating satisfies IEC 61800-5-1 reinforced insulation requirements. | Use Scenario: Monitoring output voltage/current of isolated DC-DC converters in medical power supplies. IC Role / Device Role / Timing Role: Digital isolator for ADC status bits and enable signals, separating SELV control domain from hazardous primary-side circuits. Use Value: Schmitt-trigger inputs reject noise from high-frequency transformer coupling; narrow-body SOIC-16 fits compact 12 mm creepage layouts. |
| Programmable Logic Controller I/O | Battery Management System Communication |
Use Scenario: Isolating digital I/O lines between PLC CPU module and field-mounted digital input cards. IC Role / Device Role / Timing Role: Quad-channel isolator handling 2 discrete inputs and 2 discrete outputs per module, supporting hot-swap diagnostics. Use Value: Dual enable pins allow firmware-controlled channel shutdown during maintenance; –40 to 125 °C operation supports uncooled cabinet deployment. | Use Scenario: Isolating UART or SPI communication between battery pack controller (BMS) and vehicle ECU in EV traction systems. IC Role / Device Role / Timing Role: Signal isolator for bidirectional telemetry and cell balancing commands across high-voltage battery stack boundaries. Use Value: AEC-Q100 qualified version available; 3.75 kVRMS withstand voltage accommodates 400–800 V battery packs with margin. |
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 NB SOIC-16 package, but 2.5 kVRMS isolation rating instead of 3.75 kVRMS. | Approved for basic insulation in lower-voltage industrial systems (e.g., <300 VAC mains), not reinforced for medical or high-voltage battery monitoring. | Select when system-level safety certification requires only 2.5 kVRMS and cost optimization is prioritized. |
| ADUM2201BRWZ | Analog Devices' 2-channel isolator in 16-pin SOIC wide-body; 2.5 kVRMS, 100 Mbps max, no dual-enable functionality. | Lacks independent EN1/EN2 control and failsafe low-default option; requires external pull-downs for safe state management. | Choose only if legacy ADI footprint compatibility is mandatory and 150 Mbps or fail-safe defaults are not required. |
Compared with SI8642BC-AS1, SI8642BB-AS1 reduces isolation margin but lowers unit cost, while ADUM2201BRWZ sacrifices speed, safety rating, and integrated fail-safe logic-making SI8642BC-AS1 optimal for new designs demanding high-speed reinforced isolation with deterministic power-loss behavior.
Availability
SI8642BC-AS1 is available at Aetrix Electronics and suitable for industrial motor control, isolated power supply monitoring, and battery management system communication requiring stable component supply across extended temperature and safety-certified operation.
Supply support for SI8642BC-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 applications-replacing optocouplers with CMOS-based RF isolation that delivers superior speed, longevity, and temperature stability.
FAQ
What is the isolation rating and safety certification status of SI8642BC-AS1?
SI8642BC-AS1 provides 3.75 kVRMS reinforced isolation and is certified to UL 1577, CSA Component Acceptance Notice 5A, IEC 62368-1, and IEC 60950-1. It meets basic insulation per VDE 0884-10 and is rated for 60-year lifetime at working voltage. The SI8642BC-AS1 does not carry VDE 0884-10 reinforced certification-that applies only to Si864xxT variants.
Does SI8642BC-AS1 support fail-safe operation, and how is it configured?
Yes, SI8642BC-AS1 is factory-configured with a fail-safe low-default output state-meaning outputs go low when VDD1 is unpowered and VDD2 remains active. This behavior is fixed per ordering part number; SI8642BC-AS1 cannot be reconfigured in-circuit. The SI8642BC-AS1 uses internal 2 µA pull-downs on output pins to enforce this state.
What are the supply voltage requirements for SI8642BC-AS1, and can VDD1 and VDD2 operate at different voltages?
SI8642BC-AS1 supports independent 2.5–5.5 V supplies on VDD1 and VDD2 sides, allowing mixed-voltage interfacing-for example, 3.3 V MCU logic on Side A and 5 V analog front-end on Side B. Both supplies must remain within specification simultaneously; operation below 2.375 V triggers undervoltage lockout on the respective side. The SI8642BC-AS1 maintains full functionality across this range without level-shifting circuitry.
How does the enable functionality work on SI8642BC-AS1, and what happens to outputs when EN pins are inactive?
SI8642BC-AS1 has two independent enable inputs: EN1 controls outputs A3/A4, and EN2 controls B1/B2. When an EN pin is driven low, its associated outputs enter high-impedance state-no pull-up or pull-down is active. EN pins are internally pulled up to VDD2, so floating EN pins default to enabled. The SI8642BC-AS1 guarantees ≤12 ns transition time from enable assertion to valid output.
Is SI8642BC-AS1 qualified for automotive applications, and what documentation is available?
SI8642BC-AS1 is an industrial-grade part (suffix "-I" denotes industrial; "-A" suffix indicates automotive). While electrically identical to automotive versions, SI8642BC-AS1 itself is not AEC-Q100 qualified nor shipped with AIAG PPAP documentation. For automotive use, select SI8642BC-AS1's automotive counterpart SI8642BC-AS (with "-A" suffix), which includes IMDS/CAMDS listings and zero-defect manufacturing flow validation.
SI8642BC-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:
- 2/2
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- 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
SI8642BC-AS1 FAQ
1.How can I place an order for SI8642BC-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8642BC-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 SI8642BC-AS1 reliable?
The price and inventory of SI8642BC-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8642BC-AS1 is usually 5 days.
3.What payment methods are accepted for SI8642BC-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8642BC-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8642BC-AS1?
SI8642BC-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8642BC-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 SI8642BC-AS1?
For technical support, including SI8642BC-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8642BC-AS1 requirements.
6.How does Aetrix verify that SI8642BC-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8642BC-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 SI8642BC-AS1 meets industry standards.
7.What is the process for return or replacement of SI8642BC-AS1?
All SI8642BC-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8642BC-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 SI8642BC-AS1 part is unused and in its original packaging.
Return procedure for SI8642BC-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8642BC-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
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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