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Skyworks Solutions Inc. SI8631BT-AS
- Part No.:
- SI8631BT-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8631BT-AS.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:2,367
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Product details
Overview
SI8631BT-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 from 2.5–5.5 V supplies across –40 to +125 °C and features selectable fail-safe low-default output state for power-loss scenarios in battery management systems.
For engineers reviewing the SI8631BT-AS datasheet, SI8631BT-AS pinout, SI8631BT-AS application, or SI8631BT-AS equivalent, this page delivers verified electrical specs, automotive AEC-Q100 qualification status, VDE 0884-10 reinforced insulation compliance, precise timing parameters (0.4 ns typical channel-channel skew), and real-world use context in high-noise traction inverter gate drive circuits.
Technical Context
The SI8631BT-AS implements RF-based on/off keying across a semiconductor isolation barrier-no optical components or start-up initialization required. Its architecture delivers robust common-mode transient immunity (≥60 kV/µs) and stable timing performance over temperature and lifetime.
It integrates Schmitt-trigger inputs for noise rejection, independent undervoltage lockout (UVLO) on both sides (VDDUV+ = 2.24 V typ), and dual enable inputs (EN1 on VDD1 side, EN2 on VDD2 side) enabling selective channel control in motor control subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed SPI, CAN FD, and isolated ADC interface clocking without oversampling. |
| Propagation Delay | 8.0 ns typical - enables sub-10 ns timing-critical feedback loops in SiC/GaN inverter gate drivers. |
| Channel-Channel Skew | 0.4 ns typical - ensures synchronized sampling across isolated analog front-ends in multi-phase motor control. |
| Isolation Rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, suitable for 800 V battery system barriers. |
| Supply Voltage Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V gate drivers without level-shifting. |
| Fail-Safe Default | Low-output on VDD1 loss - prevents unintended IGBT turn-on during brown-out in on-board chargers. |
| CMTI | ≥60 kV/µs - maintains signal integrity in high-dV/dt environments like traction inverters with >10 kV/µs switching noise. |
| AEC-Q100 Grade | Grade 1 (–40 to +125 °C) - qualified for under-hood automotive applications including battery electric vehicle power stages. |
Pinout & Package
SI8631BT-AS uses a RoHS-compliant 16-pin wide-body SOIC package (7.5 mm creepage/clearance), rated for 5 kVRMS reinforced insulation 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 and RF transmitter; must be bypassed with 0.1 µF capacitor near pin. |
| GND1 | Input-side ground | Reference return for VDD1 and all Side-A signals; requires low-inductance connection to isolate noise coupling. |
| INA | Input A (channel 1) | Schmitt-triggered digital input referenced to VDD1/GND1; accepts 2.0–5.5 V logic levels. |
| INB | Input B (channel 2) | Second Schmitt-triggered input on VDD1 side; enables dual-signal isolation (e.g., PWM + fault flag). |
| EN1 | Enable for A3 output | Active-high control on VDD1 side; drives A3 output into high-Z when low-used for multiplexed diagnostics. |
| VDD2 | Output-side supply | Power for RF receiver and output drivers; supports independent 2.5–5.5 V domain for isolated peripherals. |
| GND2 | Output-side ground | Isolated reference for VDD2 and Side-B outputs; must be physically separated from GND1 per safety spacing rules. |
| OUTA | Output A3 (channel 3) | Fail-safe low-default output on VDD2 side; mirrors INA when enabled, held low during VDD1 loss. |
| OUTB | Output B1 (channel 1) | Isolated replica of INA; driven by RF receiver with 50 Ω nominal output impedance for controlled-impedance routing. |
| OUTC | Output B2 (channel 2) | Isolated replica of INB; matches OUTB timing within 0.4 ns skew for synchronous signal transfer. |
| EN2 | Enable for B1/B2 outputs | Active-high control on VDD2 side; disables both OUTB and OUTC simultaneously into high-Z state. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; enables 60-year life at rated working voltage. |
| Selectable fail-safe mode | Factory-configured low-default output ensures safe shutdown of downstream gate drivers during input supply failure. |
| Ultra-low power at 100 Mbps | 6.6 mA (VDD1) / 9.9 mA (VDD2) at 100 Mbps - reduces thermal load in sealed automotive enclosures. |
| Reinforced VDE 0884-10 certification | Validated for 10 kV surge capability and 5 kVRMS working voltage - meets IEC 60601-1 and 60950-1 system requirements. |
| Automotive PPAP support | AIAG-compliant documentation, IMDS/CAMDS listings, and zero-defect manufacturing flow for OEM production traceability. |
Applications
| On-Board Charger (OBC) | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Isolating 3.3 V MCU SPI commands from 400–800 V DC-link monitoring circuitry in bidirectional OBCs. IC Role / Device Role / Timing Role: SI8631BT-AS transmits PWM enable, voltage sense enable, and fault clear signals across the isolation barrier with <10 ns delay and 0.4 ns inter-channel skew. Use Value: Prevents false triggering during high-dV/dt commutation events via ≥60 kV/µs CMTI and fail-safe low default on MCU reset. |
Use Scenario: Transmitting cell voltage measurement triggers and pack-level fault flags from isolated analog front-end to host controller in EV battery packs. IC Role / Device Role / Timing Role: SI8631BT-AS carries two independent ADC conversion start pulses (INA/INB) and returns a consolidated fault status (OUTA) with deterministic timing. Use Value: Enables synchronized multi-cell sampling with sub-nanosecond skew, critical for accurate state-of-charge estimation under dynamic load. |
| Traction Inverter Gate Drive | Charging Station Power Stack |
|
Use Scenario: Providing isolated gate drive enable and DESAT fault feedback between DSP and SiC half-bridge modules in 800 V inverters. IC Role / Device Role / Timing Role: SI8631BT-AS delivers fast-turn-on enable (OUTB), fast-turn-off disable (OUTC), and fault latch (OUTA) with matched propagation delays. Use Value: Guarantees <13 ns max propagation delay mismatch between enable/disable paths, preventing shoot-through during hard switching. |
Use Scenario: Isolating communication lines (UART/RS-485) and auxiliary power sequencing signals between AC front-end and DC output stage in 150 kW charging stations. IC Role / Device Role / Timing Role: SI8631BT-AS routes control signals across reinforced 5 kVRMS barrier while maintaining EMI resilience in high-power magnetic environments. Use Value: Achieves system-level IEC 61851-23 compliance via VDE 0884-10 certification and 7.5 mm creepage in wide-body SOIC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM3301ARWZ | 3-channel, 25 Mbps max, 2.5–5.5 V, 2.5 kVRMS, SOIC-16 narrow body | Lacks AEC-Q100 qualification, VDE 0884-10, and 150 Mbps capability; unsuitable for traction inverter timing paths | Consider only for cost-sensitive industrial SPI isolation where speed and automotive compliance are not required. |
| ISO7731FDWR | 3-channel, 100 Mbps max, 2.25–5.5 V, 5 kVRMS, SOIC-16 wide body, AEC-Q100 Grade 1 | Higher propagation delay (11 ns typ), lower CMTI (85 kV/µs), no selectable fail-safe default output | Acceptable for BMS communication where timing skew is less critical, but not for gate drive enable/disable synchronization. |
Compared with ADUM3301ARWZ and ISO7731FDWR, SI8631BT-AS uniquely combines 150 Mbps speed, 0.4 ns channel skew, VDE 0884-10 reinforcement, and factory-set fail-safe low output-making it the only option qualified for time-critical, safety-relevant functions in 800 V automotive power stages.
Availability
SI8631BT-AS is available at Aetrix Electronics and suitable for battery electric vehicle powertrain development, on-board charger design, and high-reliability industrial motor control requiring stable component supply across extended temperature and regulatory compliance lifecycles.
Supply support for SI8631BT-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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for wireless, automotive, and industrial markets.
The SI863x family was engineered specifically for high-reliability automotive and industrial isolation-delivering RF-based digital isolation with AEC-Q100 qualification, VDE 0884-10 reinforcement, and fail-safe configurability to replace aging optocoupler solutions.
FAQ
What is the isolation rating and safety certification status of SI8631BT-AS?
SI8631BT-AS is rated for 5 kVRMS reinforced isolation and certified to UL 1577, CSA Component Notice 5A, VDE 0884-10 (reinforced), IEC 60950-1, IEC 61010-1, and CQC GB4943.1. These certifications validate its suitability for functional and basic insulation in 800 V battery systems and medical-grade power supplies. The device meets all requirements for reinforced insulation per IEC 60747-5-5 and IEC 60950-1 Annex H.
Does SI8631BT-AS support fail-safe operation, and how is it configured?
Yes, SI8631BT-AS has factory-configured fail-safe behavior: its default output state is low when VDD1 is unpowered and VDD2 remains active. This configuration is fixed per ordering code ('BT' suffix denotes low-default). No external components or register writes are needed-the behavior is inherent to the silicon and guaranteed across temperature and lifetime.
What are the supply voltage and temperature ranges supported by SI8631BT-AS?
SI8631BT-AS operates from 2.5 V to 5.5 V on both VDD1 and VDD2 sides independently, with full functionality across –40 °C to +125 °C ambient temperature. It is AEC-Q100 Grade 1 qualified, meaning it undergoes stress testing and characterization across this full range, including thermal cycling, HTOL, and ESD verification.
How does the enable pin functionality work on SI8631BT-AS?
SI8631BT-AS has two enable inputs: EN1 controls output A3 (OUTA), and EN2 controls outputs B1/B2 (OUTB/OUTC). When EN1 = low, OUTA enters high-impedance; when EN2 = low, both OUTB and OUTC enter high-impedance. Both pins are internally pulled up to their respective VDD domains and can be left floating, tied high, or driven externally for diagnostic multiplexing.
What is the channel configuration of SI8631BT-AS, and how does it differ from SI8630BT-AS?
SI8631BT-AS provides 2 input channels (INA, INB) on the VDD1 side and 1 output channel (OUTA) on the VDD2 side, plus 2 additional output channels (OUTB, OUTC) mirroring INA/INB. In contrast, SI8630BT-AS offers 3 input channels on VDD1 and zero outputs on VDD2-making SI8631BT-AS optimal for asymmetric signal routing such as control-to-power-domain handshaking in OBCs.
SI8631BT-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
SI8631BT-AS FAQ
1.How can I place an order for SI8631BT-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631BT-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 SI8631BT-AS reliable?
The price and inventory of SI8631BT-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631BT-AS is usually 5 days.
3.What payment methods are accepted for SI8631BT-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631BT-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631BT-AS?
SI8631BT-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631BT-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 SI8631BT-AS?
For technical support, including SI8631BT-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631BT-AS requirements.
6.How does Aetrix verify that SI8631BT-AS is sourced from the original manufacturer or authorized distributors?
All SI8631BT-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 SI8631BT-AS meets industry standards.
7.What is the process for return or replacement of SI8631BT-AS?
All SI8631BT-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8631BT-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 SI8631BT-AS part is unused and in its original packaging.
Return procedure for SI8631BT-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631BT-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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