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Skyworks Solutions Inc. SI8631BB-AS
- Part No.:
- SI8631BB-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8631BB-AS.pdf
- Description:
- AUTOMOTIVE LOW-POWER TRIPLE-CHAN
- Quantity:
- Payment:
- Shipping:
Inventory:3,013
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Product details
Overview
SI8631BB-AS from Skyworks is a 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 features Schmitt-trigger inputs, selectable fail-safe low-default output, and operates across –40°C to +125°C for industrial and automotive systems requiring robust galvanic signal separation.
For engineers reviewing the SI8631BB-AS datasheet, SI8631BB-AS pinout, SI8631BB-AS application, or SI8631BB-AS equivalent, this page delivers verified electrical specs, validated pin functions, real-world use cases in motor control and battery management, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The SI8631BB-AS uses RF-based on/off keying across a semiconductor isolation barrier-no startup initialization required-and maintains stable timing performance across temperature and voltage (2.5–5.5 V). Its architecture provides inherent noise immunity via Schmitt-trigger inputs and supports independent undervoltage lockout (UVLO) on both sides.
It implements a configurable fail-safe mode where the isolated output defaults to logic low during input-side power loss, with enable pins (EN1 on Side A, EN2 on Side B) allowing per-channel output tri-state control. Channel skew is ≤2.5 ns, pulse width distortion ≤4.5 ns, and CMTI ≥50 kV/µs under 1500 V common-mode transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like SPI, RS-485, and CAN FD without external clock conditioning. |
| Propagation Delay | 5.0–13 ns - enables tight timing budgets in real-time motor control and feedback loops. |
| Isolation Rating | 2.5 kVRMS - certified to UL 1577 and IEC 60747-5-5, suitable for reinforced insulation in 250 VAC safety-critical subsystems. |
| Supply Voltage Range | 2.5–5.5 V - allows interoperability with 3.3 V microcontrollers and 5 V legacy peripherals on both sides. |
| Channel Configuration | 2 inputs / 1 output - optimized for bidirectional control signaling where one side drives status/feedback and the other receives command signals. |
| Fail-Safe Default | Low - ensures safe shutdown state in power-loss scenarios for gate drivers and enable lines in inverters. |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade 1, enabling deployment in under-hood automotive electronics. |
Pinout & Package
SI8631BB-AS is housed in a RoHS-compliant wide-body SOIC-16 package (7.5 mm creepage/clearance), rated for 2.5 kVRMS isolation and compatible with JEDEC J-STD-020 reflow profiles (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies power to input-side logic and RF transmitter; must be bypassed with 0.1 µF capacitor near pin. |
| GND1 | Input-side ground reference | Return path for VDD1; requires separate PCB plane from GND2 to maintain isolation integrity. |
| INA | Input A (Side A) | First digital input channel with Schmitt-trigger threshold (VT+ = 1.67 V typ); accepts 2.5–5.5 V logic levels. |
| INB | Input B (Side A) | Second digital input channel; identical electrical behavior to INA; supports independent signal routing. |
| EN1 | Enable input (Side A) | Controls output A3: high enables pass-through, low forces A3 into high-impedance state; internally pulled up. |
| VDD2 | Output-side power supply | Supplies power to RF receiver and output driver; independent of VDD1 for true galvanic isolation. |
| GND2 | Output-side ground reference | Return path for VDD2; electrically isolated from GND1; defines output logic reference. |
| OUTA | Output A (Side B) | Isolated replica of INA; default-low fail-safe behavior activated when VDD1 is unpowered. |
| OUTB | Output B (Side B) | Isolated replica of INB; matches OUTA timing with ≤2.5 ns channel-to-channel skew. |
| EN2 | Enable input (Side B) | Controls outputs B1/B2: high enables pass-through, low forces B1/B2 into high-impedance state. |
| A3 | Output A3 (Side B) | Third output channel driven by EN1; provides isolated enable/control signal for downstream ICs or MOSFET gates. |
| NC | No-connect terminal | Not internally bonded; may be left floating, tied to GND2, or used as thermal pad anchor-no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; enables >60-year lifetime at rated working voltage. |
| Selectably fail-safe output | Factory-configured low-default state ensures predictable deactivation of power stages during brownout or controller reset. |
| Ultra-low power at 100 Mbps | 6.6–9.9 mA per side at 100 Mbps (2.5–5.5 V), reducing thermal load in dense PCB layouts and extending battery life in portable systems. |
| High CMTI immunity | ≥50 kV/µs common-mode transient immunity prevents false triggering in noisy motor drive and inverter environments. |
| Wide supply range compatibility | 2.5–5.5 V operation on both sides enables direct interfacing with mixed-voltage systems (e.g., 3.3 V MCU + 5 V sensor bus). |
Applications
| Motor Control Feedback | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Isolating encoder signals and current-sense ADC outputs from a 400 V DC-link inverter stage. IC Role / Device Role / Timing Role: SI8631BB-AS transmits position and phase current data across isolation barrier with ≤13 ns propagation delay and ≤2.5 ns channel skew. Use Value: Enables precise field-oriented control (FOC) timing alignment between MCU and gate driver, minimizing torque ripple. |
Use Scenario: Communicating cell voltage and temperature readings from high-side monitoring ICs to a low-side system controller in an EV traction battery pack. IC Role / Device Role / Timing Role: SI8631BB-AS carries daisy-chained ADC data and fault alerts across 2.5 kVRMS barrier while maintaining fail-safe low default on communication lines. Use Value: Prevents erroneous high-side switch activation during partial power loss, improving functional safety compliance (ISO 26262 ASIL-B). |
| Industrial PLC I/O Module | On-Board Charger (OBC) Control |
|
Use Scenario: Providing isolated digital inputs for emergency stop, limit switches, and sensor status in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: SI8631BB-AS conditions and isolates 24 VDC field signals to 3.3 V logic, using Schmitt-trigger inputs to reject EMI in factory-floor environments. Use Value: Reduces false triggers from 50/60 Hz magnetic fields and switching transients, improving system uptime and diagnostic reliability. |
Use Scenario: Isolating PWM commands from the OBC controller to SiC gate drivers and relaying AC line detection/status back to the MCU. IC Role / Device Role / Timing Role: SI8631BB-AS routes bidirectional control signals across the primary-secondary barrier in a 6.6 kW AC/DC converter. Use Value: Supports fast 150 Mbps update rates for adaptive dead-time control and meets reinforced insulation requirements per IEC 62109. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8631BD-AS | 5.0 kVRMS isolation rating vs. 2.5 kVRMS; same pinout, timing, and supply specs. | Required for systems needing reinforced insulation per IEC 62368-1 or UL 62368-1 at higher working voltages (>400 V RMS). | Select SI8631BD-AS when end-equipment certification mandates ≥5 kVRMS test voltage or extended creepage requirements. |
| ADUM130N0BRZ-RL7 | 3-channel, 2:1 directionality; 3.0 kVRMS; 150 Mbps; 10 ns max propagation delay; SOIC-16 narrow body. | Narrow-body package reduces PCB area but offers lower creepage (5.5 mm vs. 7.5 mm); not AEC-Q100 qualified. | Choose ADUM130N0BRZ-RL7 only for space-constrained industrial designs where automotive qualification is unnecessary. |
Compared with SI8631BB-AS, SI8631BD-AS provides higher isolation margin for high-voltage grid-tied equipment, while ADUM130N0BRZ-RL7 trades automotive reliability and creepage for smaller footprint-neither is pin-compatible without layout revision due to differing package dimensions and certification scope.
Availability
SI8631BB-AS is available at Aetrix Electronics and suitable for motor control feedback, battery management systems, industrial PLC I/O modules, and on-board charger control requiring stable component supply across automotive and industrial production cycles.
Supply support for SI8631BB-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 engineered for high-noise industrial and automotive environments, delivering ultra-low-power, high-speed digital isolation with guaranteed lifetime performance and AEC-Q100 qualification.
FAQ
What is the isolation rating and safety certification status of the SI8631BB-AS?
The SI8631BB-AS is rated for 2.5 kVRMS isolation and certified to UL 1577, CSA Component Notice 5A, VDE 0884-5 (IEC 60747-5-5), and CQC GB4943.1. It meets reinforced insulation requirements per IEC 60950-1 and is approved for use in industrial and automotive systems up to 250 VAC working voltage. SI8631BB-AS does not carry VDE 0884-10 certification, which applies only to T-suffix variants.
Does the SI8631BB-AS support bidirectional data transmission?
No, the SI8631BB-AS is unidirectional: it has two input channels (INA, INB) on the VDD1 side and one dedicated output channel (A3) on the VDD2 side, plus two additional outputs (OUTA, OUTB) replicating the inputs. Bidirectional communication requires pairing with a second isolator or using a different variant like SI8630xx. SI8631BB-AS is designed for asymmetric signal flow-e.g., command + status from MCU to power stage.
What is the meaning of the "-AS" suffix in SI8631BB-AS?
The "-AS" suffix denotes the automotive-grade version of the SI8631BB device. It is manufactured using full automotive process flows-including AIAG-compliant PPAP documentation, IMDS/CAMDS material reporting, zero-defect methodology, and AEC-Q100 Grade 1 qualification (–40°C to +125°C). Electrically and physically identical to its industrial "-IS" counterpart, SI8631BB-AS is intended for automotive applications such as on-board chargers and battery management systems.
How does the fail-safe mode operate in the SI8631BB-AS during input-side power loss?
When VDD1 is unpowered while VDD2 remains active, the SI8631BB-AS drives all outputs (OUTA, OUTB, A3) to logic low within 12 ns (tSD), per its factory-configured fail-safe setting. This behavior is hardwired-not software-controllable-and ensures downstream circuits (e.g., gate drivers or enable lines) enter a known safe state. The default low configuration is specified in the ordering guide and cannot be changed post-manufacture.
Can the SI8631BB-AS be used with 2.5 V logic on both sides simultaneously?
Yes, the SI8631BB-AS supports 2.5 V operation on both VDD1 and VDD2 sides, drawing 1.5 mA per channel at 1 Mbps and 3.5 mA per channel at 100 Mbps (typical). Input thresholds (VT+ = 1.67 V, VT– = 1.23 V) and output drive strength (VOH ≥ VDD–0.4 V, VOL ≤ 0.4 V) are fully specified down to 2.5 V, ensuring reliable interfacing with low-voltage FPGAs, ASICs, and battery-powered controllers.
SI8631BB-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:
- 2500Vrms
- 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
SI8631BB-AS FAQ
1.How can I place an order for SI8631BB-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631BB-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 SI8631BB-AS reliable?
The price and inventory of SI8631BB-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631BB-AS is usually 5 days.
3.What payment methods are accepted for SI8631BB-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631BB-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631BB-AS?
SI8631BB-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631BB-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 SI8631BB-AS?
For technical support, including SI8631BB-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631BB-AS requirements.
6.How does Aetrix verify that SI8631BB-AS is sourced from the original manufacturer or authorized distributors?
All SI8631BB-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 SI8631BB-AS meets industry standards.
7.What is the process for return or replacement of SI8631BB-AS?
All SI8631BB-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8631BB-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 SI8631BB-AS part is unused and in its original packaging.
Return procedure for SI8631BB-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631BB-AS Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
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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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