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Skyworks Solutions Inc. SI8621BC-AS
- Part No.:
- SI8621BC-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8621BC-AS.pdf
- Description:
- AUTOMOTIVE 3.75 KV 1 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:1,243
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Product details
Overview
SI8621BC-AS from Skyworks Solutions is a dual-channel, unidirectional digital isolator with reinforced 5 kVRMS isolation, 150 Mbps data rate, <10 ns propagation delay, and Schmitt-trigger inputs for high noise immunity-used in isolated ADC interfaces and motor control gate drivers.
For engineers reviewing the SI8621BC-AS datasheet, SI8621BC-AS pinout, SI8621BC-AS application, or SI8621BC-AS equivalent, this page delivers verified specifications, WB SOIC-16 package details, fail-safe mode configuration, CMTI of 50 kV/µs, and automotive-grade AEC-Q100 qualification for safety-critical designs.
Technical Context
The SI8621BC-AS implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust operation without external timing components. Its dual-channel architecture supports independent side-A and side-B power domains (2.5–5.5 V) with separate undervoltage lockout monitors.
It features selectable fail-safe output state (default low per ordering option 'BC'), precise timing with ≤2.5 ns channel-channel skew and ≤5 ns minimum pulse width, and operates across –40 to 125 °C with 60-year lifetime at rated working voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed serial links like SPI, RS-485, and isolated CAN FD transceivers. |
| Propagation delay | 5.0–14 ns - enables tight timing budgets in real-time motor control and isolated feedback loops. |
| Isolation rating | 5 kVRMS reinforced - certified to UL 1577, VDE 0884-10, and IEC 62368-1 for industrial and automotive safety compliance. |
| Supply voltage | 2.5–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| CMTI | 50 kV/µs - ensures reliable operation in noisy environments such as inverters and battery management systems. |
| Fail-safe mode | Default low output - defined by 'BC' suffix; outputs drive low during VDD1 loss while VDD2 remains powered. |
| Operating temperature | –40 to 125 °C - qualified for under-hood automotive and industrial ambient conditions. |
Pinout & Package
SI8621BC-AS is housed in a wide-body SOIC-16 (WB SOIC-16) package with 8.3 mm creepage/clearance, supporting reinforced insulation up to 5 kVRMS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND1 (Pins 1, 7) | Side 1 ground reference | Return path for VDD1 domain; must be decoupled with 0.1 µF capacitor near Pin 3. |
| VDD1 (Pin 3) | Side 1 supply input | Power for input-side logic and RF transmitter; accepts 2.5–5.5 V with UVLO thresholds at 2.16–2.375 V. |
| A1 (Pin 4), A2 (Pin 5) | Side 1 digital inputs | Unidirectional data inputs with Schmitt-trigger thresholds (VT+ = 1.67 V typ, VT– = 1.23 V typ) for noise rejection. |
| GND2 (Pins 9, 16) | Side 2 ground reference | Isolated return for VDD2 domain; requires separate 0.1 µF bypass capacitor near Pin 14. |
| VDD2 (Pin 14) | Side 2 supply input | Power for output-side logic and RF receiver; independent of VDD1, enabling level translation. |
| B1 (Pin 13), B2 (Pin 12) | Side 2 digital outputs | CMOS-compatible outputs with 50 Ω nominal impedance; default low during VDD1 loss per BC ordering option. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift issues of optocouplers; no start-up initialization required. |
| Selectably fail-safe output | 'BC' suffix guarantees default-low behavior when input-side supply fails-critical for safe shutdown in motor drives. |
| Ultra-low power at 100 Mbps | 5.8 mA per channel at 5 V (typ), reducing thermal load in dense PCB layouts and extending battery life in portable systems. |
| High electromagnetic immunity | 50 kV/µs common-mode transient immunity meets IEC 61000-4-4 Level 4 for industrial noise environments. |
| Automotive qualification | AEC-Q100 Grade 1 (–40 to 125 °C) with AIAG-compliant PPAP support-enables use in OBCs and traction inverters. |
Applications
| Isolated ADC Interface | Motor Gate Driver Isolation |
|---|---|
Use Scenario: Isolating high-resolution SAR or sigma-delta ADCs in industrial PLCs where analog front-end operates at ±15 V and digital controller runs at 3.3 V. IC Role / Device Role / Timing Role: Dual-channel unidirectional isolator transmitting conversion-ready and clock signals across isolation barrier with <2.5 ns skew. Use Value: Maintains signal integrity at 1 MSPS sampling rates while preventing ground loop errors and meeting IEC 61000-4-5 surge immunity. |
Use Scenario: Driving high-side and low-side IGBT gates in three-phase inverters with independent control logic and power domains. IC Role / Device Role / Timing Role: Provides galvanic separation between MCU PWM outputs and gate driver ICs, ensuring precise dead-time control. Use Value: Enables <10 ns propagation delay matching and fail-safe low output during controller reset-preventing shoot-through faults. |
| Battery Management System | Onboard Charger Control |
Use Scenario: Isolating cell voltage monitoring and pack current sensing in EV battery packs with 400–800 V DC bus. IC Role / Device Role / Timing Role: Transfers fault status and balancing commands from isolated slave controllers to master MCU across 5 kVRMS barrier. Use Value: Reinforced insulation and AEC-Q100 qualification ensure long-term reliability in high-voltage, high-temperature battery enclosures. |
Use Scenario: Communicating control signals between AC/DC stage and DC/DC stage in bidirectional OBCs operating up to 11 kW. IC Role / Device Role / Timing Role: Isolates UART or SPI lines between primary-side controller and secondary-side regulation circuitry. Use Value: 150 Mbps capability supports fast closed-loop response for dynamic load changes; CMTI >50 kV/µs suppresses EMI from high-frequency switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM2201BRWZ | 2-channel, 1 Mbps max data rate; 50 kV/µs CMTI; SOIC-16 package; no fail-safe option. | Limited to low-speed control signaling; lacks automotive qualification and high-speed timing precision. | Choose for cost-sensitive, non-automotive applications where data rate <1 Mbps suffices. |
| ISO7721DWR | 2-channel, 100 Mbps; 80 kV/µs CMTI; SOIC-16; default-high fail-safe only. | Higher CMTI but fixed default-high output-requires redesign if system requires default-low safety state. | Prefer when ultra-high noise immunity is critical and fail-safe polarity matches system logic requirements. |
Compared with ADUM2201BRWZ and ISO7721DWR, SI8621BC-AS uniquely combines 150 Mbps speed, default-low fail-safe behavior, AEC-Q100 qualification, and 5 kVRMS reinforced isolation-making it optimal for next-generation EV power electronics requiring both performance and functional safety.
Availability
SI8621BC-AS is available at Aetrix Electronics and suitable for industrial automation systems, battery management systems, and onboard chargers requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for SI8621BC-AS 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 high-performance analog semiconductors, specializing in RF, timing, and isolation solutions for communications, automotive, and industrial markets.
The Si86xx family was designed specifically for replacing optocouplers in safety-critical, high-noise, and high-data-rate applications-delivering CMOS reliability, low power, and certified reinforced isolation.
FAQ
What is the isolation rating and safety certification of SI8621BC-AS?
The SI8621BC-AS provides 5 kVRMS reinforced isolation and is certified to UL 1577 (5000 VRMS, 1 min), VDE 0884-10 (reinforced), CSA IEC 62368-1, and CQC GB4943.1. These certifications validate its use in medical, industrial, and automotive end-equipment requiring double or reinforced insulation barriers.
Does SI8621BC-AS support fail-safe operation, and how is it configured?
Yes-the 'BC' suffix in SI8621BC-AS denotes a factory-configured default-low fail-safe mode: when VDD1 is unpowered but VDD2 remains active, both B1 and B2 outputs drive low. This behavior is fixed per ordering option and does not require external configuration.
What is the maximum data rate and propagation delay of SI8621BC-AS?
The SI8621BC-AS supports up to 150 Mbps data rate with typical propagation delay of 8.0 ns (min 5.0 ns, max 14 ns). This enables use in high-speed isolated communication protocols including SPI, RS-485, and digital power control loops.
Can SI8621BC-AS operate across different supply voltages on each side?
Yes-SI8621BC-AS supports independent 2.5–5.5 V supplies on VDD1 and VDD2, enabling seamless level translation between 3.3 V microcontrollers and 5 V analog subsystems without external level shifters or additional power rails.
Is SI8621BC-AS qualified for automotive applications?
Yes-SI8621BC-AS is AEC-Q100 Grade 1 qualified (–40 to 125 °C), includes AIAG-compliant PPAP documentation, and supports IMDS/CAMDS reporting. It is approved for use in onboard chargers, battery management systems, and traction inverters.
SI8621BC-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- 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:
- 2.5V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SI8621BC-AS FAQ
1.How can I place an order for SI8621BC-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8621BC-AS 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 SI8621BC-AS reliable?
The price and inventory of SI8621BC-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8621BC-AS is usually 5 days.
3.What payment methods are accepted for SI8621BC-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8621BC-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8621BC-AS?
SI8621BC-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8621BC-AS 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 SI8621BC-AS?
For technical support, including SI8621BC-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8621BC-AS requirements.
6.How does Aetrix verify that SI8621BC-AS is sourced from the original manufacturer or authorized distributors?
All SI8621BC-AS 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 SI8621BC-AS meets industry standards.
7.What is the process for return or replacement of SI8621BC-AS?
All SI8621BC-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8621BC-AS, 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 SI8621BC-AS part is unused and in its original packaging.
Return procedure for SI8621BC-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8621BC-AS 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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