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Skyworks Solutions Inc. SI8631ET-AS
- Part No.:
- SI8631ET-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8631ET-AS.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:1,734
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Product details
Overview
SI8631ET-AS from Skyworks is an automotive-grade triple-channel digital isolator with 2 input channels on VDD1 side and 1 output channel on VDD2 side, supporting up to 150 Mbps data rate, <10 ns propagation delay, and 5 kVRMS reinforced isolation in a wide-body SOIC-16 package. It operates across –40 to +125 °C and features selectable high-default fail-safe mode for power-loss scenarios in battery management systems.
For engineers reviewing the SI8631ET-AS datasheet, SI8631ET-AS pinout, SI8631ET-AS application, or SI8631ET-AS equivalent, this page delivers verified electrical specs, automotive AEC-Q100 qualification status, fail-safe behavior under undervoltage, CMTI ≥60 kV/µs, and precise timing parameters critical for traction inverter gate drive and isolated ADC interfaces.
Technical Context
The SI8631ET-AS implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture supports independent undervoltage lockout (UVLO) on both sides (VDD1/VDD2), with thresholds at 2.24 V (rising) and 2.16 V (falling), ensuring deterministic fail-safe transitions during brownout.
It integrates Schmitt-trigger inputs (0.44 V hysteresis), 50 Ω nominal output impedance, and dual enable controls (EN1 on Side A, EN2 on Side B) allowing independent tri-state control of A3 and B1/B2 outputs-enabling multiplexed signal routing in motor control feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed SPI, CAN FD, and isolated PWM feedback in real-time motor control. |
| Propagation Delay | 8.0 ns typical - enables sub-10 ns timing-critical gate driver synchronization in SiC/GaN inverters. |
| Isolation Rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, suitable for functional safety compliance in EV battery packs. |
| Fail-Safe Default | High output - ensures active-high enable signals remain asserted during VDD1 loss in BMS monitoring circuits. |
| CMTI | ≥60 kV/µs - maintains signal integrity in high-dV/dt environments like traction inverters with >10 kV/µs switching transients. |
| Supply Voltage Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting. |
| Operating Temperature | –40 to +125 °C - validated for under-hood automotive use per AEC-Q100 Grade 1 requirements. |
Pinout & Package
SI8631ET-AS uses a RoHS-compliant wide-body SOIC-16 package (10.3 mm creepage/clearance), optimized for reinforced insulation and high-voltage system separation in automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | VDD1, GND1, IN1, IN2 | Input-side power, ground, and two digital inputs - accepts 2.5–5.5 V logic; Schmitt-triggered for noise margin. |
| 5, 6, 7, 8 | A3, EN1, GND1, VDD1 | Third input channel (A3) and dedicated enable (EN1) - EN1 controls A3 tri-state; shared VDD1/GND1 with inputs. |
| 9, 10, 11, 12 | VDD2, GND2, B1, B2 | Output-side power, ground, and two isolated outputs - drives 50 Ω loads directly; default-high when VDD1 lost. |
| 13, 14, 15, 16 | B3, EN2, GND2, VDD2 | Third output (B3) and enable (EN2) - EN2 controls B1/B2 tri-state; B3 remains active unless EN2 = low. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift-ensures 60-year life at rated working voltage with stable timing over –40 to +125 °C. |
| Selectable fail-safe mode | Factory-configured high-default output guarantees safe state retention in BMS fault detection paths during primary supply failure. |
| Channel-channel skew | 0.4 ns typical - enables tightly synchronized sampling of three-phase current/voltage in isolated ADC applications. |
| Low-power operation | 6.6 mA per side at 100 Mbps (2.5 V) - reduces thermal load in compact OBC modules with limited heatsinking. |
| AEC-Q100 qualified | Grade 1 (–40 to +125 °C) with AIAG PPAP support and IMDS/CAMDS compliance - meets full automotive production traceability requirements. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
Use Scenario: Isolating cell voltage monitoring and pack-level communication between high-voltage battery stack and MCU. IC Role / Device Role / Timing Role: SI8631ET-AS provides galvanic isolation for three differential ADC inputs while maintaining sub-10 ns timing alignment across channels. Use Value: Enables accurate SOC/SOH estimation via synchronized multi-cell sampling without external timing compensation. |
Use Scenario: Transmitting PWM gate signals and fault feedback between MCU and SiC half-bridge drivers in EV traction inverters. IC Role / Device Role / Timing Role: SI8631ET-AS isolates high-side/low-side gate drive enable lines and desaturation fault return with <2.5 ns channel skew. Use Value: Prevents shoot-through by guaranteeing matched propagation delay across gate drive paths under fast dV/dt conditions. |
| On-Board Charger (OBC) | Charging Station Interface |
Use Scenario: Isolating digital control signals between AC/DC PFC stage and DC/DC LLC converter in bidirectional OBCs. IC Role / Device Role / Timing Role: SI8631ET-AS carries synchronous rectifier timing, current sense alerts, and soft-start commands across isolation boundary. Use Value: Maintains tight phase alignment between interleaved PFC legs despite 1500 V common-mode transients during grid switching. |
Use Scenario: Providing isolated communication and status reporting between charging station controller and vehicle battery interface. IC Role / Device Role / Timing Role: SI8631ET-AS isolates CAN FD bus signals and HV contactor status in ISO 15118-compliant DC fast-charging handshaking. Use Value: Ensures interoperability and safety-critical fault signaling meets IEC 62196-2 and UL 2231 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8631ED-AS | Same 2:1 channel configuration and 5 kVRMS rating, but default-low fail-safe output instead of high-default. | Suitable where safety logic requires de-assertion of enable signals during power loss (e.g., emergency shutdown paths). | Select SI8631ED-AS only if system architecture mandates low-default behavior; otherwise SI8631ET-AS preserves active states. |
| ADUM3301ARWZ-RL7 | 3-channel, 2:1 direction, 25 Mbps max rate, 2.5 kVRMS isolation, no AEC-Q100 qualification. | Limited to industrial automation or non-automotive BMS due to lower speed, isolation, and no automotive process flow. | Use ADUM3301ARWZ-RL7 only in cost-sensitive, non-safety-critical designs where 150 Mbps and 5 kVRMS are not required. |
Compared with SI8631ED-AS and ADUM3301ARWZ-RL7, SI8631ET-AS uniquely combines automotive-grade reliability, 150 Mbps bandwidth, 5 kVRMS reinforced isolation, and factory-programmed high-default fail-safe behavior-making it the only option qualified for ASIL-B–capable traction inverter and OBC subsystems.
Availability
SI8631ET-AS is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and charging station interfaces requiring stable component supply across automotive production lifecycles.
Supply support for SI8631ET-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 semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies for high-reliability applications.
The SI863x family was designed specifically for automotive and industrial isolation needs-delivering ultra-low-power, high-speed, and AEC-Q100–qualified digital isolation where legacy optocouplers and capacitive isolators fall short in lifetime, CMTI, and temperature stability.
FAQ
What is the fail-safe output behavior of SI8631ET-AS during VDD1 power loss?
SI8631ET-AS is factory-configured with high-default fail-safe mode: when VDD1 is unpowered and VDD2 remains active, all three outputs (B1, B2, B3) assert logic high within 12 ns. This behavior is confirmed in Table 3.1 of the datasheet and ensures safety-critical enable signals remain active during primary-side brownout in battery management systems.
Does SI8631ET-AS support independent enable control for its input and output channels?
Yes. SI8631ET-AS provides EN1 on the input side (pin 6) to control tri-state of A3, and EN2 on the output side (pin 14) to control tri-state of B1/B2. B3 remains enabled unless EN2 is asserted low. This dual-enable architecture allows flexible signal gating in motor control feedback loops without affecting isolated power domains.
What is the maximum common-mode transient immunity (CMTI) specification for SI8631ET-AS?
SI8631ET-AS achieves ≥60 kV/µs CMTI (per Table 4.2), measured at VCM = 1500 V with VI = VDD or 0 V. This exceeds IEC 61800-5-1 requirements for drives and enables reliable operation in SiC/GaN-based traction inverters where dV/dt exceeds 50 kV/µs during switching transitions.
Is SI8631ET-AS pin-compatible with other SI863x variants in the same SOIC-16 wide-body package?
Yes-SI8631ET-AS shares identical pinout and footprint with all SI863x devices in WB SOIC-16 (e.g., SI8631BD-AS, SI8631BT-AS). However, channel count, default output state, and isolation rating differ by part number; design reuse requires verification of logic mapping and fail-safe behavior per application.
What automotive qualifications does SI8631ET-AS hold beyond AEC-Q100?
SI8631ET-AS is built using full automotive-specific manufacturing flows, supported by AIAG-compliant PPAP documentation, IMDS and CAMDS material declarations, and zero-defect methodology throughout production. It is certified to UL 1577, VDE 0884-10 (reinforced), IEC 60601-1, and GB4943.1-meeting system-level safety standards for EV powertrain applications.
SI8631ET-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:
- No
- Number of Channels:
- 3
- Inputs - Side 1/Side 2:
- 2/1
- 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
SI8631ET-AS FAQ
1.How can I place an order for SI8631ET-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631ET-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 SI8631ET-AS reliable?
The price and inventory of SI8631ET-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631ET-AS is usually 5 days.
3.What payment methods are accepted for SI8631ET-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631ET-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631ET-AS?
SI8631ET-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631ET-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 SI8631ET-AS?
For technical support, including SI8631ET-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631ET-AS requirements.
6.How does Aetrix verify that SI8631ET-AS is sourced from the original manufacturer or authorized distributors?
All SI8631ET-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 SI8631ET-AS meets industry standards.
7.What is the process for return or replacement of SI8631ET-AS?
All SI8631ET-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8631ET-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 SI8631ET-AS part is unused and in its original packaging.
Return procedure for SI8631ET-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631ET-AS Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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