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Skyworks Solutions Inc. SI8621ET-ASR
- Part No.:
- SI8621ET-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8621ET-ASR.pdf
- Description:
- AUTOMOTIVE LOW-POWER SINGLE AND
- Quantity:
- Payment:
- Shipping:
Inventory:2,416
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Product details
Overview
SI8621ET-ASR from Skyworks Solutions is a dual-channel, reinforced-isolation digital isolator in WB SOIC-16 package, supporting up to 150 Mbps data rate, <10 ns propagation delay, and 5 kVRMS isolation. It features selectable fail-safe output (default high), operates from 2.5–5.5 V, and is AEC-Q100 qualified for automotive battery management and traction inverter systems.
For engineers reviewing the SI8621ET-ASR datasheet, SI8621ET-ASR pinout, SI8621ET-ASR application, or SI8621ET-ASR equivalent, key selection criteria include its 5 kVRMS reinforced insulation per VDE 0884-10, 50 kV/µs CMTI, dual-channel directionality, and automotive-grade qualification under –40°C to +125°C ambient conditions.
Technical Context
The SI8621ET-ASR 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 bidirectional signal paths with Schmitt-trigger inputs and internal 50 Ω output impedance.
It integrates undervoltage lockout (UVLO) on both sides (VDD1/VDD2), with hysteresis of 50–95 mV and thresholds at 1.88–2.375 V. Fail-safe behavior is fixed by part number: "ET" denotes default-high output during input-side power loss, enforced via internal pull-ups on all I/Os.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - enables high-speed serial interfaces like SPI, RS-485, and CAN FD without timing bottlenecks. |
| Propagation delay | 5.0–14 ns - ensures sub-15 ns latency critical for real-time motor control and fast feedback loops. |
| Isolation rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, suitable for primary-secondary barriers in EV chargers and inverters. |
| CMTI | 50–100 kV/µs - maintains signal integrity in high-dV/dt environments such as IGBT gate drivers and DC-link monitoring. |
| Supply voltage | 2.5–5.5 V - supports direct interfacing with 3.3 V microcontrollers and 5 V legacy logic without level-shifting. |
| Operating temperature | –40°C to +125°C - meets automotive under-hood and industrial ambient requirements without derating. |
| Fail-safe mode | Default-high output - guarantees known logic state during VDD1 loss, preventing undefined gate drive or communication errors. |
Pinout & Package
SI8621ET-ASR uses a wide-body SOIC-16 (WB SOIC-16) package with creepage/clearance optimized for 5 kVRMS reinforced insulation. Pin assignments are validated per Skyworks datasheet revision 206328B.
| 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 (Pin 3) | Side 1 supply | Power source for channel transmitter side; accepts 2.5–5.5 V; UVLO active below 1.88 V. |
| A1 (Pin 4), A2 (Pin 5) | Side 1 digital I/O | Two independent input/output channels on isolated side A; Schmitt-trigger inputs tolerate slow edges and noise. |
| GND2 (Pins 9, 16) | Side 2 ground reference | Isolated return for output-side loads; physically separated from GND1 to maintain barrier integrity. |
| VDD2 (Pin 14) | Side 2 supply | Power for receiver side; independent UVLO monitoring ensures safe operation even if VDD1 fails. |
| B1 (Pin 13), B2 (Pin 12) | Side 2 digital I/O | Corresponding outputs for A1/A2; default-high state asserted when VDD1 is unpowered (ET ordering option). |
| NC (Pins 2, 6, 8, 10, 11, 15) | No-connect | Not internally bonded; may be left floating, tied to VDD, or grounded-no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift; enables >60-year life at rated working voltage with stable timing over –40°C to +125°C. |
| Selectably fail-safe output | "ET" suffix guarantees default-high output during VDD1 loss-critical for safety-critical gate drivers where open-circuit defaults are unacceptable. |
| Ultra-low power at 100 Mbps | 5.8 mA per channel at 5 V / 100 Mbps-reduces thermal load in densely packed automotive modules and extends battery runtime in portable BMS. |
| Precise channel-to-channel timing | 0.4–2.5 ns skew enables synchronous sampling across dual ADC channels or matched PWM signals in three-phase motor control. |
| Reinforced VDE 0884-10 certification | Validated for 10 kV surge immunity and 5 kVRMS working voltage-meets IEC 62368-1 and IEC 60601-1 system-level safety requirements. |
Applications
| Motor Control Systems | Battery Management Systems (BMS) |
|---|---|
Use Scenario: Isolating gate-drive signals between MCU and IGBT/SiC half-bridge in EV traction inverters. 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 1000 V/µs DC-link transients; 5 kVRMS rating satisfies reinforced insulation for functional safety compliance. | Use Scenario: Communicating cell voltage measurements from high-side monitor ICs to isolated MCU in multi-cell EV battery packs. IC Role / Device Role / Timing Role: Transmitting isolated SPI clock and data between analog front-end and host controller across 400–800 V potential difference. Use Value: 150 Mbps capability supports high-resolution, low-latency telemetry; AEC-Q100 qualification ensures reliability over 15-year vehicle lifetime. |
| Onboard Chargers (OBC) | Traction Inverter Control |
Use Scenario: Isolating feedback signals (voltage/current) from secondary-side power stage to primary-side digital controller in bidirectional OBCs. IC Role / Device Role / Timing Role: Providing galvanic separation for analog sensing and digital control loops while maintaining <10 ns propagation delay for fast regulation. Use Value: 2.5–5.5 V supply range allows direct interface with both 3.3 V controllers and 5 V analog circuits; Schmitt inputs reject EMI in high-noise AC/DC conversion stages. | Use Scenario: Isolating encoder position data and resolver excitation signals in high-power electric drivetrains. IC Role / Device Role / Timing Role: Dual-channel transmission of quadrature A/B signals with matched propagation delay to preserve phase accuracy. Use Value: 0.5 ns typical channel-channel skew preserves encoder resolution; 125°C operation supports placement near power modules without heatsinking. |
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 |
|---|---|---|---|
| ADUM2201BRWZ | 2.5–5.5 V supply; 1 Mbps max data rate; 2.5 kVRMS basic isolation; no AEC-Q100 qualification. | Targeted at industrial automation, not automotive safety-critical systems. | Choose only for cost-sensitive non-automotive designs where 150 Mbps and reinforced isolation are unnecessary. |
| ISO7721FDWR | 50 Mbps max data rate; 5 kVRMS reinforced; 3.3 V only; no default-high fail-safe option. | Suitable for industrial PLC I/O modules but lacks automotive qualification and high-speed capability. | Select when 3.3 V-only operation is acceptable and fail-safe state can be managed externally via pull-up resistors. |
Compared with ADUM2201BRWZ and ISO7721FDWR, SI8621ET-ASR delivers 3× higher data rate, automotive qualification, and factory-configured default-high fail-safe behavior-enabling single-part compliance with ASIL-B functional safety requirements in battery and inverter subsystems.
Availability
SI8621ET-ASR is available at Aetrix Electronics and suitable for automotive battery management systems, traction inverters, onboard chargers, and industrial motor drives requiring stable component supply across extended product lifecycles.
Supply support for SI8621ET-ASR 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 provider of analog semiconductors for wireless, automotive, and industrial markets, specializing in RF, timing, and isolation technologies.
The Si86xx family was designed specifically for high-reliability, high-speed digital isolation in automotive and industrial power systems-emphasizing long-term stability, low power, and safety certification readiness.
FAQ
What is the isolation rating and safety certification status of the SI8621ET-ASR?
The SI8621ET-ASR is rated for 5 kVRMS reinforced isolation and 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 safety-critical automotive and industrial applications requiring double or reinforced insulation barriers.
Does the SI8621ET-ASR require external components for stable operation?
Yes-the SI8621ET-ASR requires a 0.1 µF bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2, placed as close as possible to the package pins. No startup initialization or external timing components are needed due to its RF-based architecture.
How does the fail-safe mode of the SI8621ET-ASR behave during power loss?
The "ET" suffix indicates a factory-set default-high fail-safe mode: when VDD1 is unpowered but VDD2 remains active, both B1 and B2 outputs are actively driven high. This behavior is implemented via internal pull-ups and is guaranteed across temperature and voltage ranges per datasheet Table 3.
What is the maximum data rate supported by the SI8621ET-ASR, and what loading condition applies?
The SI8621ET-ASR supports up to 150 Mbps with CL = 15 pF on all outputs, as verified by eye diagram testing (Figure 3). At this rate, typical supply current is 5.8 mA per channel at 5 V, and propagation delay remains ≤14 ns with <5 ns pulse width distortion.
Is the SI8621ET-ASR compatible with 2.5 V logic systems?
Yes-the SI8621ET-ASR operates across 2.5–5.5 V on both VDD1 and VDD2. At 2.5 V, it delivers 1.5 mA per channel at 1 Mbps and 3.5 mA per channel at 100 Mbps, with VIH minimum of 2.0 V and VIL maximum of 0.8 V, ensuring reliable interfacing with 2.5 V CMOS logic families.
SI8621ET-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-ASR FAQ
1.How can I place an order for SI8621ET-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8621ET-ASR 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-ASR reliable?
The price and inventory of SI8621ET-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8621ET-ASR is usually 5 days.
3.What payment methods are accepted for SI8621ET-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8621ET-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8621ET-ASR?
SI8621ET-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8621ET-ASR 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-ASR?
For technical support, including SI8621ET-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8621ET-ASR requirements.
6.How does Aetrix verify that SI8621ET-ASR is sourced from the original manufacturer or authorized distributors?
All SI8621ET-ASR 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-ASR meets industry standards.
7.What is the process for return or replacement of SI8621ET-ASR?
All SI8621ET-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8621ET-ASR, 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-ASR part is unused and in its original packaging.
Return procedure for SI8621ET-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8621ET-ASR 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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