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Skyworks Solutions Inc. SI8621ET-IS2
- Part No.:
- SI8621ET-IS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8621ET-IS2.pdf
- Description:
- LOW-POWER SINGLE AND DUAL-CHANNE
- Quantity:
- Payment:
- Shipping:
Inventory:1,405
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Product details
Overview
SI8621ET-IS2 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 high), and operates from 2.5–5.5 V across –40 to 125 °C for use in battery management systems and traction inverters.
For engineers reviewing the SI8621ET-IS2 datasheet, SI8621ET-IS2 pinout, SI8621ET-IS2 application, or SI8621ET-IS2 equivalent, key selection criteria include reinforced VDE 0884-10 certification, 50 kV/µs CMTI, channel-channel skew ≤2.5 ns, and automotive-grade AEC-Q100 qualification for high-reliability isolated signal transmission.
Technical Context
The SI8621ET-IS2 implements RF-based on/off keying across a semiconductor isolation barrier, eliminating start-up initialization and enabling robust noise immunity without optical degradation. Its dual-channel architecture supports independent side-A and side-B undervoltage lockout (UVLO) with separate VDD1/VDD2 monitoring and fail-safe default-high output behavior during input-side power loss.
It delivers precise timing with 0.5 ns typical channel-channel skew and 2 ns propagation delay skew, while maintaining stable performance over temperature via CMOS process optimization. The device uses internal 50 Ω output impedance 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 timing bottlenecks. |
| Propagation delay | 5.0–14 ns - enables sub-10 ns real-time control loop response in motor drives and power converters. |
| Channel-channel skew | ≤2.5 ns - ensures matched timing between dual channels for differential signaling or redundant sensing paths. |
| Isolation rating | 5 kVRMS reinforced - meets IEC 62368-1 and VDE 0884-10 requirements for safety-critical industrial and automotive systems. |
| CMTI | ≥60 kV/µs - suppresses fast transients in high-noise environments such as inverters and onboard chargers. |
| Supply voltage | 2.5–5.5 V - interoperable with 3.3 V and 5 V logic domains without level-shifting circuitry. |
| Operating temperature | –40 to 125 °C - qualified for under-hood automotive and industrial ambient conditions. |
| Fail-safe mode | Default-high output - maintains known logic state during VDD1 loss, critical for safe shutdown sequencing. |
Pinout & Package
SI8621ET-IS2 is housed in a WB SOIC-16 package with creepage/clearance optimized for reinforced insulation. 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 | Provides low-impedance return path for input-side logic; must be decoupled locally with 0.1 µF capacitor. |
| VDD1 (Pin 3) | Side 1 power supply | Supplies 2.5–5.5 V to input-side transmitter; UVLO threshold at 2.24 V (typical). |
| A1 (Pin 4) | Digital I/O (Side 1) | Primary input/output channel with Schmitt-trigger input for noise immunity; compatible with 3.3 V/5 V logic. |
| A2 (Pin 5) | Digital I/O (Side 1) | Secondary input/output channel on same side; electrically isolated but shares VDD1/GND1 domain. |
| GND2 (Pins 9, 16) | Side 2 ground reference | Independent return path for output-side receiver; galvanically separated from GND1 by isolation barrier. |
| VDD2 (Pin 14) | Side 2 power supply | Supplies 2.5–5.5 V to output-side receiver; independent UVLO monitoring prevents false outputs during brownout. |
| B1 (Pin 13) | Digital I/O (Side 2) | Isolated output corresponding to A1; default-high fail-safe state active when VDD1 = 0 V. |
| B2 (Pin 12) | Digital I/O (Side 2) | Isolated output corresponding to A2; matches B1 timing characteristics with ≤2.5 ns channel-channel skew. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced VDE 0884-10 certification | Validated for 5 kVRMS working voltage and 10 kV surge immunity-enables single-package isolation in safety-critical EV/BMS designs. |
| Selectably fail-safe output (default high) | Eliminates need for external pull-up resistors in safety-shutdown circuits; ensures defined logic state during VDD1 loss. |
| Ultra-low power at 100 Mbps | 5.8 mA per channel at 5 V - reduces thermal load in densely packed power electronics modules. |
| 60 kV/µs common-mode transient immunity | Prevents data corruption in high-dV/dt environments like SiC/GaN inverter switching nodes. |
| No start-up initialization required | Outputs become valid within 40 µs of VDD application-simplifies boot sequence in real-time control systems. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40 to 125 °C with zero defects in HTOL and TC testing-supports PPAP compliance. |
Applications
| Battery Management Systems (BMS) | Traction Inverters |
|---|---|
Use Scenario: Isolating cell voltage monitoring signals and pack-level communication between high-voltage battery stacks and MCU controllers. IC Role / Device Role / Timing Role: Dual-channel isolator transmitting analog front-end ADC data and fault status across 400–800 V DC bus barriers. Use Value: Enables accurate, noise-immune sampling at 150 Mbps with <2.5 ns inter-channel skew-critical for synchronized cell balancing decisions. | Use Scenario: Transmitting PWM gate-drive signals and feedback from current/voltage sensors in 3-phase motor inverters. IC Role / Device Role / Timing Role: Providing isolated, low-skew signal paths for IGBT/SiC driver enable/disable and desaturation detection. Use Value: 60 kV/µs CMTI and 5 kVRMS reinforced isolation prevent false triggering during 10 kV/µs switching transients in high-power inverters. |
| Onboard Chargers (OBC) | Industrial PLC I/O Modules |
Use Scenario: Isolating AC/DC and DC/DC control loops, including PFC stage feedback and secondary-side regulation signals. IC Role / Device Role / Timing Role: Dual-channel isolator carrying bidirectional communication (UART/SPI) and unidirectional fault reporting across primary-secondary boundaries. Use Value: Default-high fail-safe mode ensures safe disable of power stages during primary-side controller reset or brownout events. | Use Scenario: Digitally isolating field-side sensor inputs and actuator outputs in programmable logic controllers operating in noisy factory environments. IC Role / Device Role / Timing Role: Replacing optocouplers in discrete I/O cards to support 150 Mbps backplane communication and fast response to emergency stop signals. Use Value: 10 ns max propagation delay and 350 ps eye diagram jitter enable deterministic <1 µs I/O update cycles in safety-rated PLCs. |
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 kVRMS basic isolation; 100 Mbps max; no AEC-Q100 qualification; SOIC-8 package. | Limited to non-automotive industrial use; lacks reinforced insulation for OBC/BMS high-voltage barriers. | Choose only for cost-sensitive, non-safety-critical 2.5 kV applications where automotive qualification is unnecessary. |
| ISO7721DWR | 5 kVRMS reinforced; 100 Mbps; 3.3 V only; SOIC-8; no default-high fail-safe option. | Suitable for industrial automation but not automotive due to missing AEC-Q100 and fixed fail-safe behavior. | Select when 3.3 V operation suffices and fail-safe polarity is managed externally-avoid for BMS shutdown sequencing. |
Compared with ADUM2201BRWZ and ISO7721DWR, SI8621ET-IS2 uniquely combines 5 kVRMS reinforced isolation, AEC-Q100 Grade 1 qualification, default-high fail-safe mode, and 150 Mbps capability in a WB SOIC-16 package-making it the only drop-in solution for automotive-grade dual-channel isolation requiring both safety certification and high-speed timing integrity.
Availability
SI8621ET-IS2 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, long-term lifecycle support, and automotive-grade reliability.
Supply support for SI8621ET-IS2 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 semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless, automotive, and industrial markets.
The Si86xx family was designed specifically for high-reliability galvanic isolation in safety-critical systems, emphasizing reinforced insulation, ultra-low power, and AEC-Q100 qualification for EV and industrial power electronics.
FAQ
What isolation rating does the SI8621ET-IS2 support, and which standards does it meet?
The SI8621ET-IS2 supports 5 kVRMS reinforced isolation and is certified to UL 1577, CSA IEC 62368-1, VDE 0884-10 (reinforced), and CQC GB4943.1. These certifications validate its suitability for high-voltage barrier applications in automotive battery management and industrial power supplies where reinforced insulation is mandated.
Does the SI8621ET-IS2 require external components for basic operation?
No, the SI8621ET-IS2 requires only two 0.1 µF bypass capacitors-one between VDD1 and GND1, and another between VDD2 and GND2-placed adjacent to the package. No pull-up/down resistors, level shifters, or initialization firmware are needed, as the device has no start-up sequence and includes internal Schmitt triggers and fail-safe logic.
How does the fail-safe mode function on the SI8621ET-IS2?
The SI8621ET-IS2 is configured as default-high: when VDD1 is unpowered (0 V) but VDD2 remains active, both B1 and B2 outputs drive logic high. This behavior is hardwired per ordering code and eliminates ambiguity during power-loss events-critical for safe shutdown in traction inverters and BMS systems where undefined states could trigger hazardous conditions.
What is the maximum data rate and timing precision of the SI8621ET-IS2?
The SI8621ET-IS2 supports up to 150 Mbps with typical propagation delay of 8 ns, pulse width distortion of 1.5 ns, and channel-channel skew of 0.5 ns. These values are guaranteed across –40 to 125 °C and enable precise synchronization in high-speed digital interfaces such as isolated SPI for ADCs and fast-response gate drivers in SiC-based power converters.
Is the SI8621ET-IS2 qualified for automotive applications?
Yes, the SI8621ET-IS2 is AEC-Q100 Grade 1 qualified (–40 to 125 °C), with AIAG-compliant PPAP documentation support and IMDS/CAMDS listings. It is explicitly listed in Skyworks' datasheet for automotive applications including onboard chargers, battery management systems, charging stations, and traction inverters in hybrid and battery electric vehicles.
SI8621ET-IS2 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-IS2 FAQ
1.How can I place an order for SI8621ET-IS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8621ET-IS2 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-IS2 reliable?
The price and inventory of SI8621ET-IS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8621ET-IS2 is usually 5 days.
3.What payment methods are accepted for SI8621ET-IS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8621ET-IS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8621ET-IS2?
SI8621ET-IS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8621ET-IS2 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-IS2?
For technical support, including SI8621ET-IS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8621ET-IS2 requirements.
6.How does Aetrix verify that SI8621ET-IS2 is sourced from the original manufacturer or authorized distributors?
All SI8621ET-IS2 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-IS2 meets industry standards.
7.What is the process for return or replacement of SI8621ET-IS2?
All SI8621ET-IS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8621ET-IS2, 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-IS2 part is unused and in its original packaging.
Return procedure for SI8621ET-IS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8621ET-IS2 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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