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Skyworks Solutions Inc. SI8631AB-AS
- Part No.:
- SI8631AB-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8631AB-AS.pdf
- Description:
- AUTOMOTIVE 2.5 KV 2 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:3,477
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Product details
Overview
SI8631AB-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 2.5 kVRMS isolation in a wide-body SOIC-16 package. It operates from 2.5–5.5 V supplies across –40 to +125 °C and features Schmitt-trigger inputs, selectable fail-safe default-low output, and AEC-Q100 qualification for battery management and traction inverter interfaces.
For engineers reviewing the SI8631AB-AS datasheet, SI8631AB-AS pinout, SI8631AB-AS application, or SI8631AB-AS equivalent, this page delivers verified electrical specs, automotive-grade timing performance (0.5 ns channel-channel skew, 5 ns min pulse width), safety certifications (UL, VDE, CQC), and real-world isolation use cases in high-noise power systems.
Technical Context
The SI8631AB-AS implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering superior noise immunity versus optocouplers. Its architecture supports independent undervoltage lockout (UVLO) on both sides (VDD1/VDD2), with thresholds at 2.24 V (rising) and 2.16 V (falling).
It integrates two enable inputs (EN1 on VDD1 side controls A3; EN2 on VDD2 side controls B1/B2), allowing per-channel output disable into high-impedance state. The device uses Schmitt-trigger inputs (1.23–1.67 V hysteresis) and exhibits 35–50 kV/µs common-mode transient immunity under 1500 VCM stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - enables high-speed serial communication in motor control gate drivers and isolated ADC interfaces. |
| Propagation Delay | 8.0 ns typical - ensures tight timing alignment between isolated control signals in real-time power converters. |
| Channel-Channel Skew | 0.5 ns max - critical for synchronized sampling across multiple isolated sensor channels in battery pack monitoring. |
| Isolation Rating | 2.5 kVRMS - meets reinforced insulation requirements for functional isolation in 400 V EV battery systems. |
| Supply Voltage Range | 2.5–5.5 V - supports direct interface with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting. |
| Operating Temperature | –40 to +125 °C - qualified for under-hood automotive environments including on-board chargers and DC-DC controllers. |
| Fail-Safe Default | Low output during input-side power loss - prevents unintended activation of high-side IGBTs in traction inverters. |
Pinout & Package
SI8631AB-AS is housed in a RoHS-compliant 16-pin wide-body SOIC package (7.5 mm creepage/clearance), rated for 2.5 kVRMS working voltage and compatible with JEDEC J-STD-020 reflow profiles (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for input logic, EN1, and RF transmitter; requires 0.1 µF bypass capacitor to GND1. |
| GND1 | Input-side ground | Reference for all input-side signals; must be separated from GND2 by ≥8 mm PCB clearance. |
| A1, A2 | Input channels | Digital inputs with Schmitt-trigger thresholds (1.23–1.67 V); tolerate slow edges and EMI without false triggering. |
| EN1 | Input-side enable | Controls output A3 only; drives A3 high-Z when low; internally pulled up to VDD1. |
| A3 | Input-side output | Isolated output driven from VDD1 side; used for feedback or bidirectional signaling in half-bridge configurations. |
| VDD2 | Output-side supply | Power for output drivers and EN2; independent of VDD1-enables dual-supply system partitioning. |
| GND2 | Output-side ground | Reference for B1/B2 outputs; galvanically isolated from GND1; defines safety barrier boundary. |
| B1, B2 | Output channels | Logic-level outputs with 50 Ω nominal impedance; require controlled-impedance routing for >50 Mbps operation. |
| EN2 | Output-side enable | Controls B1/B2 outputs; disables both into high-Z when low; internally pulled up to VDD2. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates startup delay and aging drift-no initialization required after power-on reset. |
| Selectably fail-safe default-low | Guarantees safe deactivation of downstream power stages during VDD1 brownout or disconnection. |
| Automotive AEC-Q100 Grade 1 | Validated for 15-year lifetime at 125 °C junction temperature in battery management and OBC applications. |
| 35–50 kV/µs CMTI | Withstands fast transients in 800 V traction inverters without data corruption or latch-up. |
| 0.5 ns channel-channel skew | Enables precise timing correlation across three isolated signals in multi-phase motor control PWM generation. |
Applications
| Motor Control Gate Driver Interface | Battery Management System (BMS) Cell Monitoring |
|---|---|
Use Scenario: Isolating PWM signals between MCU and 3-phase IGBT/SiC gate drivers in EV traction inverters. IC Role / Device Role / Timing Role: SI8631AB-AS transmits three synchronized control signals (two PWMs + one fault feedback) across isolation barrier with sub-nanosecond skew. Use Value: Enables precise dead-time control and fast fault response (<12 ns default-output assertion) to prevent shoot-through in high-power inverters. |
Use Scenario: Transmitting cell voltage and temperature readings from isolated high-voltage battery stack to MCU in 400–800 V BEV packs. IC Role / Device Role / Timing Role: SI8631AB-AS carries isolated SPI clock/data from isolated ADCs to host controller while maintaining signal integrity at 10+ Mbps. Use Value: Supports real-time cell balancing decisions with <8 ns start-up time and 5 ns minimum pulse width for reliable high-speed sampling. |
| On-Board Charger (OBC) Feedback Loop | Traction Inverter Current Sensing Interface |
Use Scenario: Isolating voltage and current feedback signals from secondary-side power stage to primary-side controller in bidirectional OBCs. IC Role / Device Role / Timing Role: SI8631AB-AS conveys isolated analog-to-digital converter outputs and status flags across 2.5 kVRMS barrier with Schmitt-trigger noise rejection. Use Value: Maintains stable regulation under EMI-rich conditions (CMTI ≥35 kV/µs) and ensures fail-safe shutdown during primary-side power loss. |
Use Scenario: Interfacing isolated current sensors (e.g., Hall-effect or shunt-based) to MCU in high-noise traction inverter motor phases. IC Role / Device Role / Timing Role: SI8631AB-AS transmits three differential current measurements with matched propagation delay (±0.5 ns skew) for vector control algorithms. Use Value: Delivers deterministic latency for FOC execution-critical for torque ripple reduction and efficiency optimization in permanent magnet motors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8631BB-AS | Same pinout and package, but 2.5 kVRMS rating and default-low output; differs only in isolation certification level (UL vs VDE-reinforced). | Used where UL 1577 recognition suffices and VDE 0884-10 reinforcement is not mandated. | Choose SI8631BB-AS if system-level safety certification does not require VDE-reinforced insulation. |
| ISO6731-Q1 | TI's 3-channel automotive isolator; 5000 VRMS rating, 100 Mbps max, 11 ns propagation delay, and different enable logic (active-low EN). | Preferred in designs requiring higher isolation voltage or TI ecosystem compatibility (e.g., C2000 MCU integration). | Choose ISO6731-Q1 when 5 kVRMS working voltage or TI-specific design support is prioritized over 150 Mbps speed. |
Compared with SI8631AB-AS, SI8631BB-AS offers identical functionality at lower isolation certification cost, while ISO6731-Q1 trades 50 Mbps bandwidth and 3 ns slower propagation for higher voltage rating and TI toolchain alignment-making SI8631AB-AS optimal for high-speed, AEC-Q100–mandated 2.5 kVRMS applications.
Availability
SI8631AB-AS is available at Aetrix Electronics and suitable for automotive battery management systems, traction inverter control modules, and on-board charger feedback loops requiring stable component supply, long-term lifecycle assurance, and AEC-Q100–compliant traceability.
Supply support for SI8631AB-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 automotive, industrial, and communications markets.
The SI863x family was designed specifically for high-reliability, high-speed isolation in electric vehicle power systems-delivering ultra-low power, precise timing, and AEC-Q100 qualification across automotive-grade variants like SI8631AB-AS.
FAQ
What is the isolation voltage rating of SI8631AB-AS?
The SI8631AB-AS is rated for 2.5 kVRMS isolation per UL 1577 and CSA Component Acceptance Notice 5A. It is certified for reinforced insulation per IEC 60950-1 and IEC 61010-1, with 7.5 mm creepage and clearance in its wide-body SOIC-16 package-meeting requirements for functional isolation in 400 V battery systems.
Does SI8631AB-AS require external startup initialization?
No, SI8631AB-AS requires no startup initialization. Its RF-based modulation architecture enables immediate data transmission upon power stabilization. Outputs follow input states within 40 µs after VDD1 and VDD2 exceed UVLO thresholds (2.16 V), eliminating boot-time delays common in capacitive or magnetic isolators.
How does the fail-safe mode operate in SI8631AB-AS?
In SI8631AB-AS, the fail-safe mode defaults outputs to logic low when VDD1 is unpowered but VDD2 remains active. This behavior is fixed by ordering code ("AB" = default-low) and ensures safe shutdown of downstream power switches-critical in traction inverter gate drive circuits where unintended high-side activation must be prevented.
What are the supply current requirements of SI8631AB-AS at 100 Mbps?
At 100 Mbps with 5 V supplies and 15 pF load, SI8631AB-AS draws 6.6 mA (typical) from VDD1 and 9.9 mA (typical) from VDD2. At 2.5 V operation, consumption drops to 5.2 mA (VDD1) and 7.3 mA (VDD2), enabling efficient isolation in low-voltage automotive domains without compromising speed.
Is SI8631AB-AS pin-compatible with other Si863x variants?
Yes, SI8631AB-AS shares identical pinout and package with all Si8631x variants in wide-body SOIC-16, including SI8631BB-AS and SI8631BD-AS. Differences are limited to isolation rating (2.5/3.75/5.0 kVRMS), default output state (low/high), and certification scope-allowing drop-in replacement where safety requirements align.
SI8631AB-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:
- -
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- -
- 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
SI8631AB-AS FAQ
1.How can I place an order for SI8631AB-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631AB-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 SI8631AB-AS reliable?
The price and inventory of SI8631AB-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631AB-AS is usually 5 days.
3.What payment methods are accepted for SI8631AB-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631AB-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631AB-AS?
SI8631AB-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631AB-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 SI8631AB-AS?
For technical support, including SI8631AB-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631AB-AS requirements.
6.How does Aetrix verify that SI8631AB-AS is sourced from the original manufacturer or authorized distributors?
All SI8631AB-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 SI8631AB-AS meets industry standards.
7.What is the process for return or replacement of SI8631AB-AS?
All SI8631AB-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8631AB-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 SI8631AB-AS part is unused and in its original packaging.
Return procedure for SI8631AB-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631AB-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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