My Inquiry
My Account
Skyworks Solutions Inc. SI8631BB-AS1
- Part No.:
- SI8631BB-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8631BB-AS1.pdf
- Description:
- AUTOMOTIVE 2.5 KV 2 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:2,626
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI8631BB-AS1 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 narrow-body SOIC-16 package. It features Schmitt-trigger inputs, selectable fail-safe low-default output, and operates across –40 to +125 °C for industrial and automotive systems requiring high-noise immunity and ultra-low power.
For engineers reviewing the SI8631BB-AS1 datasheet, SI8631BB-AS1 pinout, SI8631BB-AS1 application, or SI8631BB-AS1 equivalent, this page delivers verified electrical specs, validated pin functions, confirmed automotive-grade AEC-Q100 qualification, narrow-body SOIC-16 package dimensions, and real-world use cases in isolated motor control, battery management, and medical ADC interfaces.
Technical Context
The SI8631BB-AS1 implements RF-based on/off keying across a semiconductor isolation barrier-no startup initialization required-and supports independent undervoltage lockout (UVLO) on both VDD1 and VDD2 sides with thresholds of 1.95–2.375 V. Its architecture enables precise timing control with ≤0.5 ns channel-channel skew and 2 ns propagation delay skew.
It integrates two enable inputs (EN1 on Side A, EN2 on Side B), allowing independent tri-state control of A3 and B1/B2 outputs. Default-low fail-safe behavior is hardwired per ordering option, ensuring predictable logic state during input-side power loss while maintaining output-side functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like SPI, RS-485, and isolated CAN FD transceivers without timing bottlenecks. |
| Propagation Delay | 5–13 ns - ensures sub-10 ns typical latency critical for real-time motor control loop closure and fast feedback paths. |
| Isolation Rating | 2.5 kVRMS - meets reinforced insulation requirements for industrial IEC 61010-1 and medical IEC 60601-1 safety standards. |
| Supply Voltage Range | 2.5–5.5 V - enables direct interfacing with 3.3 V microcontrollers and 5 V legacy peripherals without level-shifting. |
| Channel Configuration | 2 inputs / 1 output - optimized for bidirectional signal routing where one side drives two control signals and the other receives status feedback. |
| Fail-Safe Default | Low - guarantees safe deactivation of downstream power stages (e.g., gate drivers) during VDD1 brownout or loss. |
| Common-Mode Transient Immunity | ≥35 kV/µs - suppresses noise coupling in high-dv/dt environments such as inverters and switching power supplies. |
Pinout & Package
SI8631BB-AS1 uses a RoHS-compliant narrow-body SOIC-16 package (5.3 mm width, 10.3 mm length, 1.75 mm height) with creepage/clearance ≥8.0 mm, rated for 2.5 kVRMS working voltage and compatible with JEDEC J-STD-020 reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power source for 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 low-inductance connection to minimize common-mode noise injection. |
| A1, A2 | Input data channels | Digital inputs accepting 2.5–5.5 V logic; Schmitt-triggered for >0.4 V hysteresis and robust noise rejection. |
| EN1 | Input-side enable | Active-high control for A3 output; when low, forces A3 into high-impedance state for multiplexing or safe shutdown. |
| VDD2 | Output-side supply | Independent power domain for RF receiver and output drivers; supports different voltage than VDD1. |
| GND2 | Output-side ground | Isolated reference for VDD2; must be physically separated from GND1 by ≥8.0 mm creepage distance. |
| B1, B2 | Output data channels | CMOS outputs driving 15 pF loads; 50 Ω nominal impedance enables controlled-impedance PCB trace routing. |
| EN2 | Output-side enable | Active-high control for B1/B2 outputs; allows dynamic disabling of isolated outputs without affecting input-side operation. |
| A3 | Input-side output | Unidirectional output from VDD2 side back to VDD1 side; used for status feedback or handshake signaling. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; maintains stable timing over –40 to +125 °C life cycle. |
| Selectably fail-safe default | Hardwired low-output state during VDD1 loss ensures gate drivers remain off and power stages stay disabled. |
| Independent UVLO monitoring | Prevents metastable output states by holding outputs stable until both VDD1 and VDD2 exceed 2.24 V threshold. |
| Ultra-low power at 100 Mbps | 6.6–9.9 mA per supply at 100 Mbps (2.5–5.5 V), reducing thermal load in dense PCB layouts and sealed enclosures. |
| AEC-Q100 qualified | Validated for automotive applications including battery management systems and on-board chargers per Grade 1 (–40 to +125 °C). |
Applications
| Motor Control Systems | Isolated ADC Interfaces |
|---|---|
Use Scenario: Gate driver isolation in three-phase inverter stacks for EV traction motors and industrial servo drives. IC Role / Device Role / Timing Role: Isolates PWM control signals from MCU to high-side IGBT/SiC drivers while feeding back fault status via A3 channel. Use Value: Enables <10 ns propagation delay and 0.5 ns channel skew to maintain precise phase alignment across all three legs under 20 kHz switching. | Use Scenario: Isolating analog front-end signals between isolated ADCs and host processors in medical patient monitors. IC Role / Device Role / Timing Role: Transfers conversion-ready strobes and data clocks across isolation barrier while rejecting CM noise from adjacent high-power circuits. Use Value: Delivers ≥35 kV/µs CMTI to preserve signal integrity in 24-bit delta-sigma ADC sampling at 1 MSPS with <1 LSB error. |
| Battery Management Systems | Industrial PLC I/O Modules |
Use Scenario: Cell voltage monitoring and pack-level communication in 800 V BEV battery packs with distributed sensing nodes. IC Role / Device Role / Timing Role: Isolates UART or SPI commands from master controller to slave monitoring ICs while returning cell fault alerts via A3. Use Value: Supports 2.5 kVRMS working voltage and AEC-Q100 qualification for long-term reliability in harsh automotive environments. | Use Scenario: Digital input conditioning and output drive isolation in modular PLC backplanes handling 24 V DC field signals. IC Role / Device Role / Timing Role: Provides galvanic separation between field-side sensors/actuators and logic-side FPGA or ARM processor. Use Value: Enables fail-safe low-default output to de-energize solenoids and contactors during controller reset or power interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8631BB-BIS1 | Industrial-grade (–I suffix); identical electrical specs and pinout but lacks AEC-Q100 qualification and PPAP documentation. | Approved for non-automotive industrial use only; not certified for automotive BMS or OBC deployment. | Select SI8631BB-BIS1 only for cost-sensitive industrial automation where automotive qualification is unnecessary. |
| ADUM130N0BRZ | Analog Devices' 3-channel isolator with 100 Mbps max rate, 13 ns propagation delay, and 3.75 kVRMS rating in SOIC-16 NB. | Higher isolation rating but lower speed and no fail-safe low-default option; requires external pull-down for safe-off behavior. | Choose ADUM130N0BRZ if 3.75 kVRMS is mandatory and data rate ≤100 Mbps suffices; verify external biasing for fail-safe logic. |
Compared with SI8631BB-BIS1, SI8631BB-AS1 adds automotive qualification and production traceability; compared with ADUM130N0BRZ, it delivers 50% higher data rate, tighter timing, and built-in fail-safe low default-reducing external component count and layout complexity in safety-critical systems.
Availability
SI8631BB-AS1 is available at Aetrix Electronics and suitable for battery management systems, motor control inverters, and isolated medical instrumentation requiring stable component supply across extended temperature and automotive lifecycle demands.
Supply support for SI8631BB-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 for wireless, automotive, and industrial markets.
The Si863x family was designed specifically for high-reliability isolation in electric vehicle powertrain systems, industrial automation, and medical equipment-emphasizing AEC-Q100 compliance, low power, and precise timing stability.
FAQ
What is the maximum data rate supported by SI8631BB-AS1?
The SI8631BB-AS1 supports a maximum data rate of 150 Mbps, verified across its full operating temperature range (–40 to +125 °C) and supply voltage range (2.5–5.5 V). This enables reliable high-speed serial communication in SPI, RS-485, and isolated CAN FD applications without signal degradation or timing violations.
Does SI8631BB-AS1 require external components for basic operation?
Yes, SI8631BB-AS1 requires two 0.1 µF bypass capacitors-one between VDD1 and GND1, and another between VDD2 and GND2-placed as close as possible to the respective pins. No pull-up/pull-down resistors are needed, as fail-safe default behavior is internally implemented per the –AS1 ordering option.
How does the fail-safe mode function in SI8631BB-AS1?
In SI8631BB-AS1, the fail-safe mode defaults all outputs to logic low when VDD1 is unpowered but VDD2 remains active. This behavior is fixed by the "–AS1" suffix and ensures downstream power stages (e.g., gate drivers) remain safely disabled during input-side brownout or power loss events.
Is SI8631BB-AS1 qualified for automotive applications?
Yes, SI8631BB-AS1 is AEC-Q100 qualified (Grade 1, –40 to +125 °C), manufactured using automotive-specific process flows, and supported with AIAG-compliant PPAP documentation, IMDS/CAMDS listings, and zero-defect methodology-making it suitable for battery management systems and on-board chargers.
What is the channel configuration of SI8631BB-AS1?
SI8631BB-AS1 has a 2-input / 1-output channel configuration: A1 and A2 are input channels on the VDD1 side, B1 and B2 are output channels on the VDD2 side, and A3 is an output channel from VDD2 back to VDD1-enabling bidirectional status feedback within a single 16-pin narrow-body SOIC package.
SI8631BB-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:
- 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-AS1 FAQ
1.How can I place an order for SI8631BB-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631BB-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 SI8631BB-AS1 reliable?
The price and inventory of SI8631BB-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631BB-AS1 is usually 5 days.
3.What payment methods are accepted for SI8631BB-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631BB-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631BB-AS1?
SI8631BB-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631BB-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 SI8631BB-AS1?
For technical support, including SI8631BB-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631BB-AS1 requirements.
6.How does Aetrix verify that SI8631BB-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8631BB-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 SI8631BB-AS1 meets industry standards.
7.What is the process for return or replacement of SI8631BB-AS1?
All SI8631BB-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8631BB-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 SI8631BB-AS1 part is unused and in its original packaging.
Return procedure for SI8631BB-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631BB-AS1 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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
