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Skyworks Solutions Inc. SI8631AB-AS1
- Part No.:
- SI8631AB-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8631AB-AS1.pdf
- Description:
- AUTOMOTIVE 2.5 KV 2 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:4,479
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Product details
Overview
SI8631AB-AS1 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 rating in narrow-body SOIC-16 package. It delivers fail-safe default-low output during input-side power loss and operates across –40 to +125 °C for battery management systems and on-board chargers.
For engineers reviewing the SI8631AB-AS1 datasheet, SI8631AB-AS1 pinout, SI8631AB-AS1 application, or SI8631AB-AS1 equivalent, key selection criteria include its AEC-Q100 qualification, selectable fail-safe mode, 2.5–5.5 V dual-supply operation, Schmitt-trigger inputs for noise immunity, and precise timing specs (0.5 ns channel-channel skew, 5 ns minimum pulse width).
Technical Context
The SI8631AB-AS1 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), and includes dedicated enable pins (EN1 on Side A, EN2 on Side B) for high-impedance control of individual channels.
It features Schmitt-trigger inputs (1.23–1.67 V hysteresis), 50 Ω nominal output impedance, and failsafe logic that drives outputs low when VDD1 is unpowered but VDD2 remains active-critical for safety-critical automotive subsystems requiring deterministic behavior during partial power loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - enables high-speed CAN FD, SPI, or isolated ADC interface in EV traction inverters |
| Propagation Delay | 8 ns typical - ensures sub-10 ns timing alignment for real-time motor control feedback loops |
| Channel-Channel Skew | 0.5 ns - maintains phase coherence across isolated signal paths in multi-phase gate driver systems |
| Isolation Rating | 2.5 kVRMS - meets reinforced insulation requirements for functional isolation in 400 V battery domains |
| Supply Voltage Range | 2.5–5.5 V per side - supports interoperability with 3.3 V microcontrollers and 5 V analog front-ends |
| Operating Temperature | –40 to +125 °C - validated for under-hood automotive environments per AEC-Q100 Grade 0 |
| CMTI | 50 kV/µs - suppresses false triggering in high-dV/dt motor drive circuits with fast IGBT/SiC switching |
Pinout & Package
SI8631AB-AS1 is housed in a RoHS-compliant narrow-body SOIC-16 package (5.3 mm width), optimized for space-constrained automotive PCB layouts while maintaining 8.0 mm creepage/clearance for 2.5 kVRMS working voltage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to input-side logic and RF transmitter; requires 0.1 µF bypass capacitor |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by isolation barrier |
| A1, A2 | Digital input channels | Schmitt-trigger inputs accepting 0–VDD1 logic; tolerate ±10 µA leakage |
| EN1 | Enable for A3 output | Active-high control: drives A3 into high-impedance when low; internally pulled up to VDD1 |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to output-side receiver and driver; requires separate 0.1 µF bypass |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1 |
| B1, B2 | Isolated output channels | CMOS outputs with 50 Ω impedance; drive 4 mA sink/source at VOL/VOH |
| EN2 | Enable for B1/B2 outputs | Active-high control: disables B1/B2 into high-impedance when low; internally pulled up to VDD2 |
| NC | No-connect terminal | Not internally bonded; may be left floating, tied to VDD2, or grounded per layout needs |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 0 qualified with full automotive process flow, PPAP documentation, and IMDS/CAMDS compliance |
| Selectable fail-safe mode | Default-low output state during VDD1 power loss ensures safe shutdown of downstream gate drivers or ADC references |
| Ultra-low power at 100 Mbps | 6.6 mA (VDD1) / 9.9 mA (VDD2) at 100 Mbps - reduces thermal load in sealed EV modules |
| Precision timing | 1.5 ns pulse width distortion and 2 ns propagation delay skew enable synchronous sampling across isolated domains |
| High CMTI immunity | 50 kV/µs common-mode transient immunity prevents data corruption near high-power SiC inverters |
Applications
| Battery Management System (BMS) | On-Board Charger (OBC) |
|---|---|
Use Scenario: Isolating cell voltage monitoring signals from MCU across 400 V battery stack. IC Role / Device Role / Timing Role: SI8631AB-AS1 transmits precision analog-to-digital converter (ADC) status and fault flags across isolation barrier with <10 ns latency. Use Value: Enables accurate SOC estimation under fast transients while meeting ASIL-B diagnostic coverage via deterministic fail-safe low output. | Use Scenario: Transmitting PWM commands from primary-side controller to secondary-side IGBT gate drivers in bidirectional AC/DC conversion. IC Role / Device Role / Timing Role: SI8631AB-AS1 carries isolated gate drive enable signals and current-sense feedback with 0.5 ns inter-channel skew. Use Value: Maintains tight timing alignment between phase legs to prevent shoot-through, critical for >95% efficiency in silicon carbide OBC designs. |
| Traction Inverter Control | Hybrid Electric Vehicle DC-DC Converter |
Use Scenario: Delivering isolated position encoder data and torque command signals from vehicle ECU to inverter MCU in high-noise motor bay. IC Role / Device Role / Timing Role: SI8631AB-AS1 routes resolver-to-digital converter outputs and safety-critical torque requests with 50 kV/µs CMTI immunity. Use Value: Guarantees signal integrity despite 10 kV/µs dV/dt noise from adjacent 800 V SiC modules, eliminating need for external filtering. | Use Scenario: Isolating communication lines (e.g., isolated UART) between 12 V LV auxiliary system and 48 V mild-hybrid bus in HEV architectures. IC Role / Device Role / Timing Role: SI8631AB-AS1 provides galvanic separation for diagnostics and firmware updates across voltage domains. Use Value: Supports ISO 26262 ASIL-A communication integrity without additional level-shifting or protection circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8631BB-AS1 | Same pinout, same 2:1 channel configuration, but rated for 2.5 kVRMS in wide-body SOIC-16 (vs. narrow-body for SI8631AB-AS1) | Preferred where board-level creepage >8.3 mm is required or where mechanical mounting tolerances favor wider package | Select SI8631AB-AS1 for space-constrained automotive modules; choose SI8631BB-AS1 when enhanced creepage or legacy footprint compatibility is needed. |
| ADUM1311ARZ | 3-channel, 2:1 direction, 100 Mbps max, 2.5 kVRMS, SOIC-16, but not AEC-Q100 qualified and lacks selectable fail-safe mode | Suitable for industrial automation or medical devices where automotive qualification is unnecessary | Use ADUM1311ARZ only in non-automotive contexts; SI8631AB-AS1 is mandatory for ASIL-relevant BMS/OBC functions due to AEC-Q100 and fail-safe enforcement. |
Compared with SI8631BB-AS1, SI8631AB-AS1 saves 2.7 mm board width while retaining identical electrical performance and automotive qualification; versus ADUM1311ARZ, it adds fail-safe determinism and AEC-Q100 validation-enabling direct deployment in ISO 26262-compliant powertrain systems without additional safety mechanisms.
Availability
SI8631AB-AS1 is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, and traction inverters requiring stable component supply with guaranteed automotive-grade traceability and long-term lifecycle support.
Supply support for SI8631AB-AS1 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.
The Si863x family was designed specifically for high-reliability automotive and industrial isolation applications demanding AEC-Q100 qualification, precise timing, and fail-safe behavior under partial power loss-targeting EV power electronics and safety-critical subsystems.
FAQ
What is the isolation rating and certification status of SI8631AB-AS1?
SI8631AB-AS1 is certified to 2.5 kVRMS per UL 1577 and CSA Component Acceptance Notice 5A, with reinforced insulation compliant to IEC 60950-1 and IEC 60601-1. It carries full AEC-Q100 Grade 0 qualification and is approved for automotive use with AIAG-compliant PPAP documentation and IMDS/CAMDS listings-ensuring compliance in safety-critical EV systems.
Does SI8631AB-AS1 support fail-safe operation, and how is it configured?
Yes, SI8631AB-AS1 implements a factory-configured fail-safe mode that drives all outputs low when VDD1 is unpowered but VDD2 remains active. This behavior is fixed per ordering code ('AB' = default low); no external configuration is required. The transition occurs within 12 ns after input-side power loss, ensuring deterministic response in battery disconnect scenarios.
What are the supply voltage requirements for SI8631AB-AS1, and can VDD1 and VDD2 operate at different voltages?
SI8631AB-AS1 supports independent 2.5–5.5 V supplies on VDD1 and VDD2 sides, enabling mixed-voltage interfacing-for example, 3.3 V MCU on Side A and 5 V gate driver on Side B. Both supplies require local 0.1 µF bypass capacitors, and UVLO thresholds (2.16–2.24 V) ensure reliable startup/shutdown sequencing without external supervision.
How does the enable pin functionality work on SI8631AB-AS1?
SI8631AB-AS1 has two enable pins: EN1 controls output A3 (Side A), and EN2 controls outputs B1/B2 (Side B). When asserted high, each enables its respective channel(s); when low, it places the output(s) in high-impedance state. Both pins are internally pulled up to their local VDD, allowing floating connection if unused-but tying them to defined logic levels is recommended in noisy automotive environments.
What is the maximum data rate and timing performance of SI8631AB-AS1 at automotive temperature extremes?
SI8631AB-AS1 maintains 150 Mbps maximum data rate across –40 to +125 °C. Propagation delay remains ≤13 ns (max), channel-channel skew ≤2.5 ns (max), and pulse width distortion ≤4.5 ns (max) over full temperature and voltage range-verified per AEC-Q100 stress testing and documented in Skyworks' Electrical Specifications tables.
SI8631AB-AS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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-AS1 FAQ
1.How can I place an order for SI8631AB-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631AB-AS1 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-AS1 reliable?
The price and inventory of SI8631AB-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631AB-AS1 is usually 5 days.
3.What payment methods are accepted for SI8631AB-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631AB-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631AB-AS1?
SI8631AB-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631AB-AS1 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-AS1?
For technical support, including SI8631AB-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631AB-AS1 requirements.
6.How does Aetrix verify that SI8631AB-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8631AB-AS1 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-AS1 meets industry standards.
7.What is the process for return or replacement of SI8631AB-AS1?
All SI8631AB-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8631AB-AS1, 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-AS1 part is unused and in its original packaging.
Return procedure for SI8631AB-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631AB-AS1 Tags
-
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.
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ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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