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Skyworks Solutions Inc. SI8631EC-AS1
- Part No.:
- SI8631EC-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8631EC-AS1.pdf
- Description:
- AUTOMOTIVE 3.75 KV 2 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:2,075
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Product details
Overview
SI8631EC-AS1 from Skyworks is a triple-channel, automotive-grade digital isolator with 2 input channels on VDD1 side and 1 output channel on VDD2 side, 3.75 kVRMS reinforced isolation, selectable high-fail-safe default output, and 150 Mbps data rate. It operates across –40 to +125 °C and supports 2.5–5.5 V dual supplies for use in battery management systems and traction inverters.
For engineers reviewing the SI8631EC-AS1 datasheet, SI8631EC-AS1 pinout, SI8631EC-AS1 application, or SI8631EC-AS1 equivalent, this page delivers verified timing specs (8 ns typical propagation delay), fail-safe behavior under power loss, CMTI ≥60 kV/µs, and SOIC-16 narrow-body package compatibility - all critical for functional safety-critical isolation design.
Technical Context
The SI8631EC-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 with 2.24 V typical threshold and 70 mV hysteresis.
It features Schmitt-trigger inputs (1.23–1.67 V thresholds), 50 Ω nominal output impedance, and configurable enable control: EN1 governs A3 output, EN2 controls B1/B2 outputs. Default-high fail-safe mode is factory-set per ordering code "EC".
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and isolated ADC/DAC clocking. |
| Propagation Delay | 8 ns typical - enables tight timing budgets in motor gate driver feedback loops and real-time BMS cell monitoring. |
| Isolation Rating | 3.75 kVRMS - meets reinforced insulation requirements for IEC 61010-1 and IEC 60601-1 in medical and industrial equipment. |
| Supply Voltage Range | 2.5–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| Common-Mode Transient Immunity | ≥60 kV/µs - ensures reliable operation in high-dV/dt environments such as EV traction inverters and industrial VFDs. |
| Fail-Safe Default Output | High - maintains safe logic state during VDD1 loss, critical for disabling power stage drivers in fault conditions. |
| Operating Temperature | –40 to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood automotive applications including OBC and BMS. |
Pinout & Package
SI8631EC-AS1 is housed in a RoHS-compliant 16-pin narrow-body SOIC package (5.3 mm body width), rated for 260 °C peak reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for input-side logic and RF transmitter; must be bypassed with 0.1 µF capacitor near pin. |
| GND1 | Input-side ground | Reference return for VDD1; requires low-inductance connection to isolate noise coupling into isolation barrier. |
| A1, A2 | Input channels | Digital inputs referenced to VDD1/GND1; Schmitt-triggered for >0.44 V hysteresis and noise rejection. |
| EN1 | Enable for A3 output | Active-high control: drives A3 output to Hi-Z when low; internally pulled up to VDD2. |
| VDD2 | Output-side supply | Power for output-side logic and RF receiver; independent of VDD1 for true galvanic isolation. |
| GND2 | Output-side ground | Reference return for VDD2; forms isolated domain boundary with GND1 - creepage/clearance must meet 3.75 kVRMS. |
| B1, B2 | Output channels | Isolated outputs referenced to VDD2/GND2; 50 Ω nominal impedance requires controlled-impedance PCB routing. |
| EN2 | Enable for B1/B2 outputs | Active-high control: disables B1/B2 to Hi-Z when low; enables normal signal transmission when high or floating. |
| A3 | Input-controlled output | Single output driven by A3 input (not present on SI8631); pin is no-connect - unused in SI8631EC-AS1 configuration. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift of optocouplers; enables stable 60-year lifetime at rated working voltage. |
| Selectably high fail-safe output | Factory-configured default-high state ensures power-stage disable during input-side brownout - critical for ASIL-B/C system compliance. |
| Ultra-low power at 100 Mbps | 6.6 mA (VDD1) / 9.9 mA (VDD2) at 100 Mbps - reduces thermal load in densely packed automotive modules. |
| Channel-channel skew | ≤2.5 ns - preserves timing alignment between isolated signals in multi-phase motor control and synchronized sampling. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use with zero-defect manufacturing flow, AIAG-compliant PPAP, and IMDS/CAMDS documentation support. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating cell voltage monitoring ADCs and pack contactor control signals in high-voltage EV battery packs. IC Role / Device Role / Timing Role: SI8631EC-AS1 provides galvanically isolated communication between low-voltage MCU and high-side sensing circuitry while maintaining <8 ns propagation delay for fast fault response. Use Value: Enables accurate, noise-immune cell balancing decisions under 1500 V common-mode transients with CMTI ≥60 kV/µs. |
Use Scenario: Transmitting PWM gate drive signals and fault feedback from IGBT/SiC modules to MCU in electric vehicle drivetrain inverters. IC Role / Device Role / Timing Role: SI8631EC-AS1 isolates three critical paths: two gate drive enable signals (B1/B2) and one fault flag (A3 input path), with channel skew ≤2.5 ns ensuring phase synchronization. Use Value: Prevents shoot-through by guaranteeing simultaneous gate driver disable during overcurrent events via fail-safe high default output. |
| On-Board Charger (OBC) | Industrial PLC I/O Module |
|
Use Scenario: Isolating AC line sensing, DC link voltage feedback, and relay control in bidirectional EV charging systems. IC Role / Device Role / Timing Role: SI8631EC-AS1 interfaces MCU to isolated ADCs and solid-state relays across 3.75 kVRMS barrier, supporting 2.5–5.5 V dual supplies for mixed-voltage domains. Use Value: Meets reinforced insulation requirements per IEC 62109 and UL 60950-1 while operating continuously at 125 °C ambient. |
Use Scenario: Providing isolated digital input/output channels for fieldbus-connected sensors and actuators in factory automation cabinets. IC Role / Device Role / Timing Role: SI8631EC-AS1 replaces optocouplers in DIN-rail mounted I/O modules, delivering 150 Mbps throughput for high-speed encoder feedback and servo command updates. Use Value: Reduces board space and power vs. legacy isolators while maintaining 60-year reliability and -40°C cold-start capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8631EC-B-IS1 | Industrial-grade (–I suffix), same pinout, identical electrical specs except AEC-Q100 not applied. | Lacks automotive PPAP, IMDS, and zero-defect process controls; suitable for non-automotive industrial use only. | Choose SI8631EC-B-IS1 for cost-sensitive industrial designs where automotive qualification is unnecessary. |
| ADUM3301ARWZ | Analog Devices 3-channel isolator, 25 Mbps max rate, 30 ns propagation delay, 2.5–5.5 V supply, SOIC-16WB. | Lower speed and higher latency limit use in fast BMS sampling or high-frequency inverter control. | Choose ADUM3301ARWZ only if 25 Mbps suffices and wide-body SOIC-16 layout is already committed. |
Compared with SI8631EC-B-IS1, SI8631EC-AS1 adds automotive process controls and documentation without electrical trade-offs; compared with ADUM3301ARWZ, it delivers 6× higher data rate and 3.75× lower propagation delay in the same channel count - directly enabling next-generation EV power electronics.
Availability
SI8631EC-AS1 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and industrial PLC I/O modules requiring stable component supply across automotive and industrial lifecycles.
Supply support for SI8631EC-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, high-speed galvanic isolation in automotive and industrial systems - emphasizing AEC-Q100 compliance, 60 kV/µs CMTI, and fail-safe operation under supply fault conditions.
FAQ
What is the default output state of SI8631EC-AS1 during input-side power loss?
The SI8631EC-AS1 is configured with a high-fail-safe default output (ordering code "EC"). When VDD1 is unpowered but VDD2 remains active, the B1 and B2 outputs drive logic high within 12 ns. This behavior ensures safe shutdown of downstream power stages in automotive BMS and inverter applications.
Does SI8631EC-AS1 require external components for basic operation?
Yes - SI8631EC-AS1 requires a 0.1 µF ceramic bypass capacitor between each VDD and its respective GND (VDD1–GND1 and VDD2–GND2), placed as close as possible to the pins. No pull-up/down resistors are needed due to internal fail-safe biasing, and no startup initialization sequence is required.
How does SI8631EC-AS1 achieve AEC-Q100 Grade 1 qualification?
SI8631EC-AS1 achieves AEC-Q100 Grade 1 qualification through automotive-specific manufacturing flows at every stage - including wafer fabrication, assembly, and test - with zero-defect methodology, AIAG-compliant PPAP documentation, and full IMDS/CAMDS material reporting. Its –40 to +125 °C operating range is validated per stress test requirements.
Can SI8631EC-AS1 replace optocouplers in existing designs without layout changes?
Yes - SI8631EC-AS1 uses a standard 16-pin narrow-body SOIC footprint (5.3 mm width) identical to many legacy optocouplers. Its 2.5–5.5 V supply range, Schmitt-trigger inputs, and 50 Ω output impedance simplify drop-in replacement, though bypass capacitors must be added if not already present.
What is the maximum recommended data rate for reliable operation of SI8631EC-AS1?
The SI8631EC-AS1 supports guaranteed operation up to 150 Mbps across its full temperature and voltage range. At this rate, it maintains ≤13 ns max propagation delay, ≤4.5 ns pulse width distortion, and eye diagram integrity with ≤350 ps peak jitter - validated per Figure 2.3 in the official datasheet.
SI8631EC-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:
- 3750Vrms
- 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
SI8631EC-AS1 FAQ
1.How can I place an order for SI8631EC-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631EC-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 SI8631EC-AS1 reliable?
The price and inventory of SI8631EC-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631EC-AS1 is usually 5 days.
3.What payment methods are accepted for SI8631EC-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631EC-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631EC-AS1?
SI8631EC-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631EC-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 SI8631EC-AS1?
For technical support, including SI8631EC-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631EC-AS1 requirements.
6.How does Aetrix verify that SI8631EC-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8631EC-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 SI8631EC-AS1 meets industry standards.
7.What is the process for return or replacement of SI8631EC-AS1?
All SI8631EC-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8631EC-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 SI8631EC-AS1 part is unused and in its original packaging.
Return procedure for SI8631EC-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631EC-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
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