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Skyworks Solutions Inc. SI8621ED-AS
- Part No.:
- SI8621ED-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8621ED-AS.pdf
- Description:
- AUTOMOTIVE 5 KV 1 FORWARD & 1 RE
- Quantity:
- Payment:
- Shipping:
Inventory:2,772
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Product details
Overview
SI8621ED-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 fail-safe default-low output mode. It operates across 2.5–5.5 V supplies and supports industrial motor control, isolated ADC interfaces, and battery management systems.
For engineers reviewing the SI8621ED-AS datasheet, SI8621ED-AS pinout, SI8621ED-AS application, or SI8621ED-AS equivalent, key selection criteria include its WB SOIC-16 package, 5 kVRMS reinforced insulation per VDE 0884-10, 0.4 ns channel-channel skew, Schmitt-trigger inputs for noise immunity, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The SI8621ED-AS implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust operation without external components beyond 0.1 µF bypass capacitors. Its architecture delivers precise timing with 1.5 ns pulse width distortion and 2 ns propagation delay skew.
It features independent undervoltage lockout (UVLO) on both sides (VDD1/VDD2), selectable fail-safe output state (default low per -ED suffix), and Schmitt-trigger inputs with 0.44 V typical hysteresis-ensuring stable logic transitions in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed serial links like SPI, RS-485, and CAN FD physical layer isolation. |
| Propagation delay | 5.0–14 ns - enables tight timing budgets in real-time control loops and feedback paths. |
| Channel-channel skew | 0.4–2.5 ns - ensures synchronized signal transfer across dual channels for phase-critical applications. |
| Isolation rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, suitable for mains-connected industrial equipment. |
| Supply voltage | 2.5–5.5 V - allows interoperability with 3.3 V and 5 V logic domains without level shifters. |
| CMTI | 50–100 kV/µs - rejects fast transients in motor drives and inverters without data corruption. |
| Fail-safe mode | Default low output - ensures safe system state during power loss on input side (ordering option -ED). |
Pinout & Package
SI8621ED-AS uses 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-supplied input-side circuitry; must be decoupled locally. |
| VDD1 (Pin 3) | Side 1 supply | Power for input-side logic and RF transmitter; requires 0.1 µF bypass capacitor. |
| A1 (Pin 4) | Input channel 1 | Digital input to Side 1; Schmitt-triggered for noise margin >400 mV. |
| A2 (Pin 5) | Input channel 2 | Digital input to Side 1; identical electrical characteristics to A1. |
| GND2 (Pins 9, 16) | Side 2 ground reference | Isolated return for VDD2-supplied output-side circuitry. |
| VDD2 (Pin 14) | Side 2 supply | Power for output-side logic and RF receiver; requires separate 0.1 µF bypass. |
| B1 (Pin 13) | Output channel 1 | Unidirectional isolated output; 50 Ω nominal impedance for controlled-impedance trace routing. |
| B2 (Pin 12) | Output channel 2 | Unidirectional isolated output; matches B1 timing and drive strength. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates startup initialization and optical degradation concerns; enables immediate data transmission after power-up. |
| Selectably fail-safe output | ED-suffix denotes default-low behavior during VDD1 undervoltage, preventing unintended actuation in safety-critical systems. |
| Ultra-low power at 100 Mbps | 5.8 mA per channel at 5 V - reduces thermal load in dense PCB layouts and extends battery life in portable BMS. |
| 60-year life at rated voltage | Validated lifetime under continuous 5 kVRMS working voltage - supports long-lifecycle industrial and automotive deployments. |
| Reinforced VDE 0884-10 certification | Meets stringent requirements for single-fault protection in medical and EV traction inverters. |
Applications
| Motor Control Feedback Isolation | Isolated ADC Interface |
|---|---|
Use Scenario: Isolating encoder signals and current-sense feedback in 3-phase inverter gate drivers. IC Role / Device Role / Timing Role: Dual-channel unidirectional isolator transmitting PWM-modulated position and analog-to-digital converter outputs across isolation barrier. Use Value: 0.4 ns channel-channel skew preserves phase alignment between current and position sampling, critical for field-oriented control accuracy. | Use Scenario: Connecting isolated sigma-delta ADCs (e.g., AMC1306) to MCU in high-voltage battery monitoring. IC Role / Device Role / Timing Role: Transmitting serial bitstream from isolated ADC to host processor while maintaining galvanic separation. Use Value: 150 Mbps data rate supports oversampled 24-bit ADC streams at >1 MSPS without bottlenecking. |
| Onboard Charger Communication | Traction Inverter Gate Driver Interface |
Use Scenario: Isolating CAN FD or SPI communication between OBC controller and AC/DC stage in EV charging systems. IC Role / Device Role / Timing Role: Bidirectional-capable isolation (via paired unidirectional channels) for command/status exchange across primary-secondary boundary. Use Value: 50 kV/µs CMTI prevents communication errors during high-di/dt switching events in LLC resonant converters. | Use Scenario: Delivering isolated PWM signals to SiC MOSFET gate drivers in 800 V traction inverters. IC Role / Device Role / Timing Role: Low-skew, high-CMTI isolation of dead-time-critical gate drive signals to half-bridge legs. Use Value: <10 ns propagation delay and 2 ns delay skew enable precise timing control essential for minimizing shoot-through risk in high-frequency SiC switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM120N0BRZ-RL7 | Single-supply (1.7–5.5 V), 150 Mbps, 10 kV surge rating, but only 3.75 kVRMS isolation and basic (not reinforced) VDE 0884-11 certification. | Suitable for non-safety-critical industrial I/O, not approved for reinforced insulation end-equipment standards (IEC 62368-1, 60601-1). | Choose when cost sensitivity outweighs reinforced certification needs and surge immunity is secondary to isolation rating. |
| ISO6721DR | 2-channel, 50 Mbps max, 5 kVRMS reinforced, 2.25–5.5 V supply, but higher 11 ns propagation delay and no AEC-Q100 qualification. | Applicable in lower-speed industrial PLCs and power supplies where automotive qualification is unnecessary. | Prefer when design targets TI ecosystem compatibility and 50 Mbps suffices; avoid for EV traction or high-speed motor control. |
Compared with ADUM120N0BRZ-RL7 and ISO6721DR, SI8621ED-AS uniquely combines AEC-Q100 qualification, VDE-reinforced 5 kVRMS, sub-10 ns propagation delay, and fail-safe default-low output-making it the only option qualified for automotive onboard chargers and industrial servo drives requiring functional safety compliance.
Availability
SI8621ED-AS is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and isolated power supply monitoring requiring stable component supply and long-term lifecycle support.
Supply support for SI8621ED-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 analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-reliability applications.
The Si86xx family was designed specifically for high-noise, high-voltage environments in industrial automation and electric vehicles-delivering RF-based digital isolation with best-in-class CMTI, timing precision, and safety certifications.
FAQ
What is the isolation rating and safety certification status of SI8621ED-AS?
SI8621ED-AS provides 5 kVRMS reinforced isolation and is certified to UL 1577, CSA IEC 62368-1, VDE 0884-10 (reinforced), and CQC GB4943.1. These approvals validate its use in safety-critical systems including medical electronics and EV battery management where double insulation is mandated.
Does SI8621ED-AS support bidirectional data transfer?
No, SI8621ED-AS is a dual-channel unidirectional isolator: A1→B1 and A2→B2 only. For bidirectional communication, two SI8621ED-AS devices must be used in opposing orientation or a dedicated bidirectional part like SI8620ED-AS selected.
What does the "ED" suffix indicate in SI8621ED-AS?
The "ED" suffix specifies the fail-safe operating mode: default-low output state when VDD1 is unpowered but VDD2 remains active. This ensures predictable deactivation of downstream circuits during input-side power loss-critical in safety-oriented motor control and charger designs.
Can SI8621ED-AS operate with 2.5 V logic on both sides?
Yes, SI8621ED-AS supports 2.5–5.5 V on both VDD1 and VDD2 independently. At 2.5 V, it draws 1.5 mA per channel at 1 Mbps and 3.5 mA per channel at 100 Mbps-enabling direct interface with low-voltage microcontrollers and ADCs without level translation.
Is SI8621ED-AS qualified for automotive applications?
Yes, SI8621ED-AS is AEC-Q100 qualified (Grade 1: –40 °C to +125 °C) and supports AIAG-compliant PPAP documentation. It is explicitly listed for automotive applications including onboard chargers, battery management systems, and traction inverters in hybrid and battery electric vehicles.
SI8621ED-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm 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:
- 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:
- 2.5V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8621ED-AS FAQ
1.How can I place an order for SI8621ED-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8621ED-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 SI8621ED-AS reliable?
The price and inventory of SI8621ED-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8621ED-AS is usually 5 days.
3.What payment methods are accepted for SI8621ED-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8621ED-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8621ED-AS?
SI8621ED-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8621ED-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 SI8621ED-AS?
For technical support, including SI8621ED-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8621ED-AS requirements.
6.How does Aetrix verify that SI8621ED-AS is sourced from the original manufacturer or authorized distributors?
All SI8621ED-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 SI8621ED-AS meets industry standards.
7.What is the process for return or replacement of SI8621ED-AS?
All SI8621ED-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8621ED-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 SI8621ED-AS part is unused and in its original packaging.
Return procedure for SI8621ED-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8621ED-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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