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Skyworks Solutions Inc. SI8631BD-AS
- Part No.:
- SI8631BD-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8631BD-AS.pdf
- Description:
- AUTOMOTIVE 5 KV 2 FORWARD & 1 RE
- Quantity:
- Payment:
- Shipping:
Inventory:3,967
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Product details
Overview
SI8631BD-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, 5 kVRMS reinforced isolation rating, 150 Mbps data rate, and selectable low-default fail-safe mode. It enables robust signal transmission across high-voltage barriers in battery management systems and traction inverters.
For engineers reviewing the SI8631BD-AS datasheet, SI8631BD-AS pinout, SI8631BD-AS application, or SI8631BD-AS equivalent, this page delivers verified technical context, precise timing specs, SOIC-16 wide-body package details, automotive AEC-Q100 qualification status, and real-world isolation design considerations for high-reliability EV power systems.
Technical Context
The SI8631BD-AS implements RF-based on/off keying across a semiconductor isolation barrier-no startup initialization required. Its architecture delivers sub-10 ns propagation delay (typ. 8 ns), 0.4 ns channel-channel skew, and 50 kV/µs common-mode transient immunity (CMTI) under 1500 VCM stress.
It features independent undervoltage lockout (UVLO) on both sides (VDDUV+ = 2.24 V typ.), Schmitt-trigger inputs (VT+ = 1.67 V, VT– = 1.23 V), and a fail-safe mode that forces outputs low when VDD1 is unpowered while VDD2 remains active-critical for safe shutdown in automotive BMS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed CAN FD, SPI, and isolated ADC interface timing without oversampling. |
| Propagation Delay | 8 ns typical - enables tight timing closure in motor control gate driver feedback loops. |
| 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 analog front-ends. |
| Fail-Safe Default | Low - ensures controlled deactivation of downstream drivers during primary-side power loss. |
| CMTI | 50 kV/µs - maintains signal integrity in high-di/dt environments like IGBT switching nodes. |
| Operating Temperature | –40 to +125 °C - meets AEC-Q100 Grade 1 requirements for under-hood automotive deployment. |
Pinout & Package
SI8631BD-AS uses a RoHS-compliant 16-pin wide-body SOIC package (7.5 mm creepage/clearance), optimized for reinforced insulation in high-voltage automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for input logic and RF transmitter; UVLO threshold 2.24 V ensures clean startup at cold cranking voltages. |
| GND1 | Input-side ground | Reference return for input signals and VDD1; must be separated from GND2 by ≥8 mm PCB clearance. |
| A1, A2 | Input channels | Digital inputs with Schmitt trigger (0.44 V hysteresis); tolerate slow-rising noise on battery-sensed lines. |
| EN1 | Enable for A3 output | Active-high control for third channel; enables multiplexed diagnostics or safety interlock gating. |
| VDD2 | Output-side supply | Independent 2.5–5.5 V rail powers output drivers and receiver; supports isolated MCU or gate driver ICs. |
| GND2 | Output-side ground | Isolated reference for B1/B2 outputs; critical for maintaining 5 kVRMS working voltage integrity. |
| B1, B2 | Output channels | 50 Ω nominal output impedance; compatible with 50 Ω PCB traces for 150 Mbps signal integrity. |
| NC | No-connect | Pins 1, 9, 10, 16 are internally unconnected; must remain floating or tied to GND/VDD per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; guarantees 60-year life at rated voltage. |
| Selectably low-default fail-safe | Ensures B1/B2 go low within 12 ns of VDD1 collapse-prevents unintended activation of high-side IGBTs. |
| Automotive AEC-Q100 qualified | Manufactured in full automotive flow with zero-defect methodology and AIAG-compliant PPAP documentation. |
| Ultra-low power at 100 Mbps | 6.6 mA (VDD1) / 9.9 mA (VDD2) at 100 Mbps - reduces thermal load in sealed traction inverter enclosures. |
| High-noise immunity inputs | Schmitt-trigger thresholds (1.23 V/1.67 V) with 0.44 V hysteresis reject >100 mV of coupled transients on HV bus sensing lines. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating cell voltage monitoring and pack contactor control signals between low-voltage MCU and 400–800 V battery stack. IC Role / Device Role / Timing Role: SI8631BD-AS transmits fault flags and precharge commands across isolation barrier with <10 ns latency and fail-safe low default. Use Value: Prevents false triggering during HV transients; enables ISO 26262 ASIL-B compliant diagnostic response within 100 µs. |
Use Scenario: Delivering PWM gate drive enable/disable signals from MCU to isolated gate driver ICs in dual-motor inverter modules. IC Role / Device Role / Timing Role: SI8631BD-AS carries EN1-controlled A3 channel for safety-critical shutdown path, plus B1/B2 for phase current feedback. Use Value: 50 kV/µs CMTI ensures reliable operation during 5 kA/ms IGBT switching; SOIC-16 WB meets creepage requirements for 800 V systems. |
| On-Board Charger (OBC) | Charging Station Communication |
|
Use Scenario: Isolating digital control signals between AC/DC PFC stage and DC/DC LLC converter in bidirectional OBC designs. IC Role / Device Role / Timing Role: SI8631BD-AS transfers interleaved PWM sync pulses and overtemperature alerts across 5 kVRMS barrier with <5 ns pulse width distortion. Use Value: Enables precise phase alignment of multi-phase converters; 150 Mbps headroom supports future firmware-upgradable control protocols. |
Use Scenario: Providing galvanic isolation between EVSE controller and vehicle communication interface (ISO 15118/IEC 62196). IC Role / Device Role / Timing Role: SI8631BD-AS isolates digital handshake signals (PLC or CAN physical layer) while maintaining EMC robustness in noisy charging environments. Use Value: Reinforced VDE 0884-10 certification satisfies EN 61851-23 requirements for EVSE safety compliance. |
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 kVRMS, SOIC-16 narrow body, no AEC-Q100 qualification | Limited to industrial automation; insufficient CMTI (25 kV/µs) and data rate for automotive traction inverters | Choose only for cost-sensitive non-automotive designs where 25 Mbps suffices and 2.5 kVRMS isolation is adequate. |
| ISO7731FDWR | 3-channel, 100 Mbps max, 5 kVRMS, SOIC-16 wide body, AEC-Q100 Grade 1, but no selectable fail-safe default | Outputs float or retain last state on VDD1 loss-requires external pull-downs for safe shutdown behavior | Prefer when fail-safe behavior is managed externally; verify board-level pull-down strength meets ASIL-B timing constraints. |
Compared with ADUM3301ARWZ and ISO7731FDWR, SI8631BD-AS uniquely combines 150 Mbps speed, AEC-Q100 qualification, 5 kVRMS reinforced isolation, and factory-configured low-default fail-safe-enabling single-component compliance with functional safety requirements in high-voltage EV subsystems without external circuitry.
Availability
SI8631BD-AS is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and charging station controllers requiring stable component supply across automotive production lifecycles.
Supply support for SI8631BD-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 high-performance analog semiconductors, specializing in RF, timing, and isolation technologies for demanding communications and automotive applications.
The Si863x family was engineered specifically for automotive and industrial high-voltage systems requiring long-life, high-CMTI, and fail-safe digital isolation-targeting EV powertrain, energy storage, and grid infrastructure.
FAQ
What is the fail-safe behavior of SI8631BD-AS during input-side power loss?
When VDD1 collapses while VDD2 remains powered, SI8631BD-AS drives B1 and B2 outputs low within 12 ns (tSD), as specified in Table 4.2. This low-default behavior is factory-configured into the SI8631BD-AS part number and eliminates need for external pull-down resistors in safety-critical paths like IGBT gate disable signals.
Does SI8631BD-AS support 3.3 V and 5 V mixed-voltage operation?
Yes, SI8631BD-AS supports independent 2.5–5.5 V supplies on both VDD1 and VDD2 sides. It can interface a 3.3 V microcontroller on the input side with a 5 V isolated gate driver on the output side-verified across –40 to +125 °C with no level-shifting components required.
How does SI8631BD-AS achieve its 50 kV/µs common-mode transient immunity?
SI8631BD-AS achieves 50 kV/µs CMTI through its RF-based modulation scheme and optimized internal layout, which minimizes coupling between input and output die. This value is measured per IEC 61000-4-4 at VCM = 1500 V and is guaranteed for all SI8631BD-AS units-not just typical.
Is SI8631BD-AS pin-compatible with other Si863x variants?
SI8631BD-AS shares the same 16-pin wide-body SOIC footprint and pinout with all Si8631x-AS variants (e.g., SI8631BB-AS, SI8631BC-AS). However, isolation rating, default output state, and data sheet timing parameters differ-so electrical validation is required before substitution.
What certifications apply to SI8631BD-AS for automotive use?
SI8631BD-AS is AEC-Q100 Grade 1 qualified, UL 1577 recognized (5 kVRMS), VDE-certified to IEC 60747-5-5 and reinforced 60950-1, and CSA 5A approved. These certifications are documented in Skyworks' official safety file and support end-system compliance with ISO 26262 and UN ECE R100.
SI8631BD-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
SI8631BD-AS FAQ
1.How can I place an order for SI8631BD-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631BD-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 SI8631BD-AS reliable?
The price and inventory of SI8631BD-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631BD-AS is usually 5 days.
3.What payment methods are accepted for SI8631BD-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631BD-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631BD-AS?
SI8631BD-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631BD-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 SI8631BD-AS?
For technical support, including SI8631BD-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631BD-AS requirements.
6.How does Aetrix verify that SI8631BD-AS is sourced from the original manufacturer or authorized distributors?
All SI8631BD-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 SI8631BD-AS meets industry standards.
7.What is the process for return or replacement of SI8631BD-AS?
All SI8631BD-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8631BD-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 SI8631BD-AS part is unused and in its original packaging.
Return procedure for SI8631BD-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631BD-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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