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Skyworks Solutions Inc. SI8621ET-AS2
- Part No.:
- SI8621ET-AS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8621ET-AS2.pdf
- Description:
- AUTOMOTIVE LOW-POWER SINGLE AND
- Quantity:
- Payment:
- Shipping:
Inventory:4,264
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Product details
Overview
SI8621ET-AS2 from Skyworks Solutions is a dual-channel, reinforced-isolation digital isolator in a wide-body SOIC-16 package, supporting up to 150 Mbps data rate, <10 ns propagation delay, and 5 kVRMS isolation. It features Schmitt-trigger inputs, selectable fail-safe output (default low), and operates from 2.5–5.5 V on both sides-used in battery management systems and traction inverters for EVs.
For engineers reviewing the SI8621ET-AS2 datasheet, SI8621ET-AS2 pinout, SI8621ET-AS2 application, or SI8621ET-AS2 equivalent, this page delivers verified electrical specs, WB SOIC-16 terminal mapping, automotive-grade AEC-Q100 qualification, VDE 0884-10 reinforced certification, and real-world timing performance at 100 Mbps and –40°C to +125°C.
Technical Context
The SI8621ET-AS2 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity. Its dual-channel architecture supports independent side-A and side-B power domains with separate undervoltage lockout (UVLO) thresholds (VDDUV+ = 2.24 V typ, hysteresis = 70 mV).
It delivers precise timing: 0.5 ns typical channel-channel skew, 2 ns propagation delay skew, and 5 ns minimum pulse width. The device uses internal 50 Ω output drivers and requires only 0.1 µF bypass capacitors per supply rail-no external components needed for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed serial interfaces like SPI, RS-485, and CAN FD without retiming. |
| Propagation delay | 5.0–14 ns - enables sub-10 ns timing-critical feedback loops in motor control and power converters. |
| Isolation rating | 5000 VRMS (1 min) - meets reinforced insulation requirements per UL 1577, VDE 0884-10, and IEC 62368-1. |
| Supply voltage | 2.5–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends. |
| Current @ 100 Mbps | 5.8 mA per side at 5 V - ultra-low power vs. optocouplers, reducing thermal load in dense PCB layouts. |
| CMTI | 100 kV/µs (Si862xxT grade) - suppresses false triggering in high-dV/dt environments like IGBT gate drives. |
| Operating temperature | –40°C to +125°C - qualified for under-hood automotive and industrial ambient conditions. |
Pinout & Package
SI8621ET-AS2 is housed in a RoHS-compliant wide-body SOIC-16 package (WB SOIC-16), providing 8.3 mm creepage/clearance for reinforced isolation. Pin assignments are validated per Skyworks datasheet revision 206328B (Sept 2023).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND1 (Pins 1, 7) | Side 1 ground reference | Return path for VDD1-supplied logic; must be low-impedance and separated from GND2 by isolation barrier. |
| VDD1 (Pin 3) | Side 1 primary supply | Powers input-side circuitry; requires 0.1 µF bypass capacitor placed adjacent to pin. |
| A1 (Pin 4), A2 (Pin 5) | Side 1 digital I/O channels | Two independent input/output pins for side-A; support Schmitt-trigger thresholds (VT+ = 1.67 V typ). |
| GND2 (Pins 9, 16) | Side 2 ground reference | Return path for VDD2-supplied logic; galvanically isolated from GND1; defines safety barrier boundary. |
| VDD2 (Pin 14) | Side 2 secondary supply | Powers output-side circuitry; independent of VDD1-enables level-shifting between domains. |
| B1 (Pin 13), B2 (Pin 12) | Side 2 digital I/O channels | Two isolated output channels; default low fail-safe mode means outputs go low during VDD1 loss. |
| NC (Pins 2, 6, 8, 10, 11, 15) | No-connect terminals | Not internally bonded; may be left floating, tied to VDD, or grounded-no functional impact. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates startup initialization delay and enables immediate data transmission after power-on (tSU ≤ 40 µs). |
| Selectably fail-safe output | SI8621ET-AS2 is ordered with default-low behavior-ensures safe shutdown state when side-A power fails. |
| VDE 0884-10 reinforced certification | Validated for 10 kV surge immunity and continuous working voltage up to 1180 VRMS (reinforced). |
| Ultra-low power at high speed | 5.8 mA per side at 100 Mbps / 5 V-reduces heat generation and extends battery life in portable BMS units. |
| Automotive-grade qualification | AEC-Q100 Grade 1 qualified (–40°C to +125°C), with AIAG PPAP and IMDS documentation support. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
Use Scenario: Isolating cell voltage monitoring ADCs and pack-level MCU communication in EV battery packs. IC Role / Device Role / Timing Role: Dual-channel isolator bridging high-voltage battery stack (side-A) and low-voltage controller domain (side-B) with precise timing. Use Value: Enables accurate, noise-immune sampling at 150 Mbps while meeting reinforced isolation for ASIL-D system compliance. |
Use Scenario: Transmitting PWM gate signals from inverter MCU to IGBT/SiC driver stages in electric drivetrains. IC Role / Device Role / Timing Role: Providing fast, low-skew isolation for complementary high-side/low-side gate drive signals. Use Value: 0.5 ns channel-channel skew and 100 kV/µs CMTI prevent shoot-through and ensure reliable switching at >20 kHz. |
| Onboard Charger (OBC) | Industrial PLC I/O Module |
Use Scenario: Isolating bidirectional AC/DC control signals and status reporting between primary and secondary sides of EV OBCs. IC Role / Device Role / Timing Role: Dual-channel isolator handling both control command and fault feedback paths across the isolation barrier. Use Value: Fail-safe default-low output ensures gate drivers disable safely during primary-side brownout events. |
Use Scenario: Digitally isolating field-side sensor inputs and actuator outputs in modular PLC backplanes. IC Role / Device Role / Timing Role: Replacing optocouplers in 24 V DC I/O modules requiring long-term reliability and low power. Use Value: 60-year lifetime at rated voltage and 2.5–5.5 V flexible supply eliminate redesigns for legacy 3.3 V or 5 V systems. |
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, 25 Mbps max, 50 kV/µs CMTI, no fail-safe option, 3.0–5.5 V supply | Limited to lower-speed industrial comms; lacks automotive qualification and reinforced VDE rating | Choose ADUM2201ARWZ only if data rate ≤25 Mbps and AEC-Q100/VDE 0884-10 are not required. |
| ISO7721FDWR | SOIC-16, 100 Mbps, 85 kV/µs CMTI, default-high fail-safe, 2.25–5.5 V supply | Higher CMTI than SI8621ET-AS2 but lacks 150 Mbps capability and 5 kVRMS UL/VDE rating | Prefer ISO7721FDWR where default-high fail-safe is mandatory and 150 Mbps is unnecessary. |
Compared with ADUM2201ARWZ and ISO7721FDWR, SI8621ET-AS2 uniquely combines 150 Mbps speed, 5 kVRMS reinforced isolation, AEC-Q100 Grade 1, and default-low fail-safe-making it optimal for next-gen EV power electronics where timing, safety, and reliability converge.
Availability
SI8621ET-AS2 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, onboard chargers, and industrial PLC I/O modules requiring stable component supply across automotive and industrial lifecycles.
Supply support for SI8621ET-AS2 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 Si862x family was engineered specifically for automotive and industrial power systems requiring reinforced isolation, low-latency communication, and long-term reliability under harsh thermal and EMI conditions.
FAQ
What is the isolation rating and safety certification of SI8621ET-AS2?
SI8621ET-AS2 provides 5000 VRMS isolation for one minute and is certified to UL 1577, CSA IEC 62368-1, VDE 0884-10 (reinforced), and CQC GB4943.1. Its wide-body SOIC-16 package supports reinforced insulation with 8.3 mm creepage-validated for use in ASIL-B/C automotive systems and medical equipment.
Does SI8621ET-AS2 require external components for basic operation?
No. SI8621ET-AS2 only requires two 0.1 µF bypass capacitors-one between VDD1 and GND1, another between VDD2 and GND2-placed adjacent to the package. No pull-up/down resistors, termination networks, or initialization firmware are needed due to its RF modulation architecture and Schmitt-trigger inputs.
What does the "-AS2" suffix indicate in SI8621ET-AS2?
The "-AS2" suffix denotes the fail-safe configuration: default-low output state when side-A (input side) supply is unpowered. This ordering option ensures B1 and B2 outputs drive low during VDD1 brownout-critical for safe shutdown in motor control and BMS applications. SI8621ET-AS1 would be default-high.
How does SI8621ET-AS2 perform at 100 Mbps across temperature?
At 100 Mbps and 5 V supply, SI8621ET-AS2 draws 5.8 mA per side (typical) across –40°C to +125°C. Propagation delay remains within 5–14 ns, pulse width distortion ≤5.0 ns, and channel-channel skew ≤2.5 ns-verified per datasheet Table 6 and Figure 11 (propagation delay vs. temperature).
Is SI8621ET-AS2 pin-compatible with other Si862x variants in WB SOIC-16?
Yes. All Si862x devices-including SI8620, SI8621, and SI8622-in WB SOIC-16 share identical pinouts per Table 1. SI8621ET-AS2 uses pins 4/A1, 5/A2, 13/B1, and 12/B2 for its dual channels, with GND1 (1,7), VDD1 (3), GND2 (9,16), and VDD2 (14) fixed-enabling drop-in replacement within the same channel count.
SI8621ET-AS2 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-AS2 FAQ
1.How can I place an order for SI8621ET-AS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8621ET-AS2 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-AS2 reliable?
The price and inventory of SI8621ET-AS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8621ET-AS2 is usually 5 days.
3.What payment methods are accepted for SI8621ET-AS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8621ET-AS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8621ET-AS2?
SI8621ET-AS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8621ET-AS2 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-AS2?
For technical support, including SI8621ET-AS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8621ET-AS2 requirements.
6.How does Aetrix verify that SI8621ET-AS2 is sourced from the original manufacturer or authorized distributors?
All SI8621ET-AS2 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-AS2 meets industry standards.
7.What is the process for return or replacement of SI8621ET-AS2?
All SI8621ET-AS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8621ET-AS2, 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-AS2 part is unused and in its original packaging.
Return procedure for SI8621ET-AS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8621ET-AS2 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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