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Skyworks Solutions Inc. SI8621ET-AS
- Part No.:
- SI8621ET-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8621ET-AS.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:4,544
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Product details
Overview
SI8621ET-AS from Skyworks Solutions is a dual-channel, reinforced-isolation digital isolator in wide-body SOIC-16 package, supporting up to 150 Mbps data rate, <10 ns propagation delay, and 5 kVRMS isolation rating. It features Schmitt-trigger inputs, selectable fail-safe output (default high), and operates from 2.5–5.5 V across –40 to +125 °C for use in isolated motor control gate drivers and battery management systems.
For engineers reviewing the SI8621ET-AS datasheet, SI8621ET-AS pinout, SI8621ET-AS application, or SI8621ET-AS equivalent, this page delivers verified specifications, WB SOIC-16 terminal mapping, automotive-grade AEC-Q100 qualification status, VDE 0884-10 reinforced insulation compliance, and real-world timing performance including 0.5 ns channel-channel skew and 5 ns minimum pulse width.
Technical Context
The SI8621ET-AS implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its dual-channel architecture supports independent side-A and side-B undervoltage lockout (UVLO) with 70 mV hysteresis and 2.24 V typical UVLO+ threshold.
It delivers precise timing with 8 ns typical propagation delay, 1.5 ns typical pulse width distortion, and 2 ns propagation delay skew-enabling synchronous sampling in isolated ADC interfaces and accurate PWM signal transfer in traction inverter gate drive circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed serial communication in isolated CAN FD gateways and fast SPI interfaces. |
| Propagation delay | 5–14 ns - ensures sub-15 ns latency for real-time feedback loops in motor control and power converter systems. |
| Isolation rating | 5 kVRMS - meets reinforced insulation requirements per VDE 0884-10 and UL 1577 for safety-critical industrial and automotive applications. |
| Supply voltage | 2.5–5.5 V - enables direct interface with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting. |
| Channel-channel skew | 0.4–2.5 ns - maintains tight timing alignment between dual channels for differential signal isolation or redundant sensing paths. |
| CMTI | 60–100 kV/µs - suppresses false triggering during fast dv/dt transients in SiC/GaN inverter switching nodes. |
| Fail-safe mode | Default high output - ensures defined logic state during VDD1 loss, critical for safe shutdown in BMS and OBC control logic. |
Pinout & Package
SI8621ET-AS is housed in a RoHS-compliant wide-body SOIC-16 package (WB SOIC-16) with 8.3 mm creepage/clearance, certified for reinforced insulation per VDE 0884-10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND1 (Pins 1, 7) | Side 1 ground reference | Provides low-impedance return path for input-side circuitry; must be decoupled with 0.1 µF capacitor near Pin 3 (VDD1). |
| VDD1 (Pin 3) | Side 1 supply input | Accepts 2.5–5.5 V for input-side logic; powers internal RF transmitter and input Schmitt trigger. |
| A1 (Pin 4), A2 (Pin 5) | Side 1 digital I/O | Two independent input channels with hysteresis (0.44 V typ); compatible with CMOS/TTL logic levels. |
| GND2 (Pins 9, 16) | Side 2 ground reference | Isolated return for output-side circuitry; requires separate 0.1 µF bypass cap at Pin 14 (VDD2). |
| VDD2 (Pin 14) | Side 2 supply input | Independent 2.5–5.5 V supply for output-side RF receiver and driver; enables level translation between domains. |
| B1 (Pin 13), B2 (Pin 12) | Side 2 digital I/O | Two isolated output channels with 50 Ω nominal output impedance; drives 15 pF loads at 100 Mbps with <4 ns rise/fall times. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift of optocouplers; enables stable 60-year lifetime at rated working voltage. |
| Selectably fail-safe output | Factory-configured default-high logic state ensures controlled deactivation of downstream MOSFETs during input-side power loss. |
| VDE 0884-10 reinforced certification | Validated for 5 kVRMS working voltage and 10 kV surge immunity-meets IEC 62368-1 and IEC 60601-1 system-level safety requirements. |
| AEC-Q100 Grade 1 qualification | Qualified for automotive operation from –40 to +125 °C ambient, supporting onboard chargers and battery electric vehicle traction inverters. |
| Ultra-low power at 100 Mbps | 5.8 mA per channel at 5 V (typ), reducing thermal load in densely packed BMS and OBC PCBs. |
Applications
| Motor Control Gate Driver Isolation | Automotive Battery Management System (BMS) |
|---|---|
Use Scenario: Isolating PWM signals from MCU to high-side/low-side gate drivers in 400 V–800 V SiC inverter stacks. IC Role / Device Role / Timing Role: Dual-channel isolator transmitting complementary PWM with <2.5 ns channel skew to prevent shoot-through. Use Value: 100 kV/µs CMTI prevents false triggering during 50 V/ns switching transients; 5 ns min pulse width supports >200 kHz carrier frequencies. |
Use Scenario: Isolating cell voltage monitoring ADC outputs and pack contactor control signals in EV battery packs. IC Role / Device Role / Timing Role: Providing reinforced isolation between low-voltage MCU domain and 400–1000 V battery stack. Use Value: 5 kVRMS rating and VDE-reinforced certification satisfy ASIL-D functional safety requirements; default-high fail-safe prevents unintended contactor closure. |
| Isolated Switch-Mode Power Supply Feedback | Industrial PLC Digital I/O Isolation |
Use Scenario: Transmitting error amplifier output across isolation barrier in isolated DC-DC converters for server PSUs and telecom rectifiers. IC Role / Device Role / Timing Role: Replacing optocoupler-based feedback loop with higher bandwidth and tighter gain stability. Use Value: 150 Mbps capability enables fast transient response; <10 ns propagation delay improves loop phase margin vs. legacy optos. |
Use Scenario: Isolating 24 V digital inputs/outputs in programmable logic controllers operating in noisy factory environments. IC Role / Device Role / Timing Role: Dual-channel isolator interfacing field-side sensors/actuators to backplane controller with ESD and surge protection. Use Value: Schmitt-trigger inputs reject 50/60 Hz noise and EFT bursts; 60 kV/µs CMTI ensures reliable operation near VFDs and welding equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM2201ARWZ | SOIC-16, 1 Mbps max data rate, 50 kV/µs CMTI, no AEC-Q100 qualification | Limited to low-speed industrial I/O; lacks automotive qualification and high-speed timing precision | Choose ADUM2201ARWZ only when data rate ≤1 Mbps and automotive qualification is not required. |
| ISO7721DWR | SOIC-16, 100 Mbps max, 85 kV/µs CMTI, 3.75 kVRMS isolation, no VDE 0884-10 reinforced cert | Suitable for industrial automation but not certified for reinforced insulation per VDE 0884-10 | Choose ISO7721DWR where 3.75 kVRMS suffices and VDE-reinforced certification is not mandated by end-system standard. |
Compared with ADUM2201ARWZ and ISO7721DWR, SI8621ET-AS uniquely combines 150 Mbps speed, VDE 0884-10 reinforced certification, AEC-Q100 Grade 1 qualification, and 100 kV/µs CMTI-making it the only option qualified for high-speed, safety-critical automotive and industrial power systems requiring full regulatory compliance.
Availability
SI8621ET-AS is available at Aetrix Electronics and suitable for automotive onboard chargers, battery management systems, and industrial motor control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SI8621ET-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 wireless, automotive, and industrial markets.
The Si86xx family was engineered to replace optocouplers with higher reliability, speed, and integration-targeting safety-critical isolation in EV powertrains, renewable energy inverters, and medical equipment.
FAQ
What isolation rating does the SI8621ET-AS support, and which standards does it meet?
The SI8621ET-AS supports 5 kVRMS reinforced isolation and is certified to UL 1577, CSA IEC 62368-1, VDE 0884-10 (reinforced), and CQC GB4943.1. Its wide-body SOIC-16 package provides 8.3 mm creepage and clearance, satisfying end-system requirements for industrial and automotive applications up to 1000 V working voltage. This certification applies specifically to the SI8621ET-AS variant per Skyworks datasheet 206328B.
Does the SI8621ET-AS require external components for stable operation?
Yes-the SI8621ET-AS requires a 0.1 µF ceramic bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2, placed as close as possible to the respective pins. No pull-up/pull-down resistors are needed on A1/A2/B1/B2 due to internal fail-safe configuration. External series termination (50–300 Ω) is optional only in highly noisy environments per Skyworks layout guidance.
What is the fail-safe behavior of the SI8621ET-AS during input-side power loss?
The SI8621ET-AS is configured as a default-high fail-safe device: when VDD1 is unpowered (0 V) and VDD2 remains active, outputs B1 and B2 remain logic high. This behavior is factory-set per ordering code "ET" and ensures safe deactivation of downstream power switches in BMS and OBC systems. The datasheet confirms this in Table 3 and Section 4.4.
Is the SI8621ET-AS qualified for automotive applications?
Yes-the SI8621ET-AS is AEC-Q100 Grade 1 qualified (–40 to +125 °C), with AIAG-compliant PPAP documentation and IMDS/CAMDS support. It is explicitly listed in Skyworks' automotive applications section for onboard chargers, battery management systems, charging stations, and traction inverters-confirming its suitability for EV powertrain systems.
How does the SI8621ET-AS achieve its 150 Mbps data rate while maintaining low power consumption?
The SI8621ET-AS achieves 150 Mbps with only 5.8 mA per channel at 5 V (typ) by using an optimized RF on/off keying modulation scheme instead of pulse-based encoding. This architecture minimizes dynamic current draw while delivering best-in-class noise immunity and magnetic field rejection-verified in Figures 5–10 of the datasheet under 100 Mbps test conditions.
SI8621ET-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):
- 60kV/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
SI8621ET-AS FAQ
1.How can I place an order for SI8621ET-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8621ET-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 SI8621ET-AS reliable?
The price and inventory of SI8621ET-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8621ET-AS is usually 5 days.
3.What payment methods are accepted for SI8621ET-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8621ET-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8621ET-AS?
SI8621ET-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8621ET-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 SI8621ET-AS?
For technical support, including SI8621ET-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8621ET-AS requirements.
6.How does Aetrix verify that SI8621ET-AS is sourced from the original manufacturer or authorized distributors?
All SI8621ET-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 SI8621ET-AS meets industry standards.
7.What is the process for return or replacement of SI8621ET-AS?
All SI8621ET-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8621ET-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 SI8621ET-AS part is unused and in its original packaging.
Return procedure for SI8621ET-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8621ET-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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