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Skyworks Solutions Inc. SI8631EC-AS1R
- Part No.:
- SI8631EC-AS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8631EC-AS1R.pdf
- Description:
- AUTOMOTIVE 3.75 KV 2 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:2,327
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Product details
Overview
SI8631EC-AS1R 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 isolation rating, selectable high-fail-safe default output, and support for DC–150 Mbps data rates. It operates across –40 to +125 °C and delivers <13 ns propagation delay with 0.4 ns typical channel-channel skew - enabling robust signal integrity in high-noise motor control and battery management systems.
For engineers reviewing the SI8631EC-AS1R datasheet, SI8631EC-AS1R pinout, SI8631EC-AS1R application, or SI8631EC-AS1R equivalent, key selection criteria include fail-safe output polarity, narrow-body SOIC-16 package footprint, AEC-Q100 qualification, 3.75 kVRMS reinforced insulation, and precise timing performance under 5 V/3.3 V/2.5 V dual-supply operation.
Technical Context
The SI8631EC-AS1R implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and providing inherent noise immunity without external components beyond 0.1 µF bypass capacitors. Its architecture supports independent undervoltage lockout (UVLO) on both sides (VDD1/VDD2), with thresholds at 2.24 V (rising) and 2.16 V (falling).
It features two enable inputs (EN1 on VDD1 side, EN2 on VDD2 side): EN1 controls output A3, EN2 controls outputs B1/B2. Default output state is logic high during input-side power loss - a factory-configured fail-safe mode confirmed by the "EC" ordering code per Table 1.1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 3-channel: 2 inputs (A1,A2), 1 output (A3) on VDD1 side; 2 outputs (B1,B2) on VDD2 side |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces including SPI, RS-485, and isolated CAN FD transceivers |
| Propagation Delay | 5–13 ns - enables sub-10 ns timing-critical feedback loops in motor gate drivers and ADC sampling |
| Isolation Rating | 3.75 kVRMS - certified to UL 1577, CSA 5A, IEC 60950-1, and CQC GB4943.1 for reinforced insulation |
| Supply Voltage | 2.5–5.5 V per side - allows mixed-voltage interfacing (e.g., 3.3 V MCU to 5 V analog front-end) |
| Fail-Safe Mode | Default High - output pins B1/B2 drive high when VDD1 is unpowered, preventing undefined states in safety-critical shutdowns |
| Temp Range | –40 to +125 °C - qualified per AEC-Q100 Grade 1 for automotive under-hood and battery pack applications |
Pinout & Package
SI8631EC-AS1R is housed in a RoHS-compliant narrow-body SOIC-16 package (5.3 mm width), optimized for space-constrained automotive PCB layouts while maintaining 8.0 mm creepage/clearance per IEC 60664-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to input logic, EN1, and internal RF transmitter; requires local 0.1 µF bypass |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by isolation barrier |
| A1, A2 | Digital input signals | Schmitt-triggered inputs with 0.44 V hysteresis - reject >1 ns noise pulses in noisy motor environments |
| EN1 | Enable control for A3 output | Active-high enable on VDD1 side; drives A3 high-impedance when low - enables multiplexing or power-gating |
| A3 | Input-side output channel | Unidirectional output referenced to VDD1/GND1; used for status feedback across isolation barrier |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to output drivers B1/B2 and EN2; independent of VDD1 |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1; defines common-mode voltage for B1/B2 |
| B1, B2 | Digital output signals | CMOS outputs with 50 Ω nominal impedance - match controlled-impedance traces for <150 Mbps signal integrity |
| EN2 | Enable control for B1/B2 outputs | Active-high enable on VDD2 side; places B1/B2 in high-Z when low - supports hot-swap or system-level power sequencing |
| NC | No-connect terminal | Not internally bonded; may be left floating, tied to VDD2, or grounded - no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates optical degradation and startup delays - achieves stable timing over 60-year lifetime at rated voltage |
| Selectably high-fail-safe output | Factory-set "EC" configuration ensures B1/B2 drive logic high during VDD1 brownout - prevents false tripping in BMS fault detection |
| Ultra-low power at 100 Mbps | 6.6–9.9 mA per side at 100 Mbps (2.5–5 V) - reduces thermal load in sealed EV battery enclosures |
| High CMTI immunity | ≥50 kV/µs common-mode transient immunity - maintains data integrity during IGBT switching noise in traction inverters |
| Automotive process flow | Full AEC-Q100 Grade 1 qualification with AIAG-compliant PPAP, IMDS/CAMDS documentation, and zero-defect methodology |
Applications
| Motor Control Feedback | Battery Management System (BMS) |
|---|---|
Use Scenario: Isolating gate driver signals and current-sense feedback in 3-phase inverter stacks for EV traction motors. IC Role / Device Role / Timing Role: SI8631EC-AS1R transmits PWM enable (A1), fault flag (A2), and isolated current measurement ready signal (A3) from controller to gate driver side, while returning isolated temperature alerts (B1) and cell voltage status (B2). Use Value: Sub-13 ns propagation delay and 0.4 ns channel skew ensure synchronized switching across all phases, reducing torque ripple and EMI. | Use Scenario: Interfacing microcontroller to isolated analog front-end in high-voltage battery packs (400–800 V). IC Role / Device Role / Timing Role: SI8631EC-AS1R carries cell monitoring commands (A1/A2) from MCU to isolated ADC, and returns fault flags (B1/B2) and calibration readiness (A3) across the barrier. Use Value: 3.75 kVRMS reinforced insulation meets IEC 61010-1 requirements for functional safety; high-fail-safe mode prevents open-circuit misinterpretation during MCU reset. |
| On-Board Charger (OBC) Control | Traction Inverter Gate Drive |
Use Scenario: Signal isolation between AC/DC controller and DC/DC stage in bidirectional OBC modules. IC Role / Device Role / Timing Role: SI8631EC-AS1R isolates PFC enable (A1), DC-link voltage OK (A2), and soft-start complete (A3) from primary side, while conveying isolated thermal warning (B1) and DC/DC fault (B2) to primary controller. Use Value: AEC-Q100 qualification ensures reliability under repeated thermal cycling; narrow-body SOIC-16 fits dense OBC power board layouts. | Use Scenario: Providing isolated gate signals and desaturation feedback in SiC MOSFET half-bridge drivers. IC Role / Device Role / Timing Role: SI8631EC-AS1R routes high-side enable (A1), low-side enable (A2), and bootstrap ready (A3) from controller, while returning desat alert (B1) and overtemperature latch (B2) to protect switches. Use Value: ≥50 kV/µs CMTI withstands fast dv/dt transients from SiC switching; 5 ns minimum pulse width supports >200 kHz PWM frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8631EC-BIS1 | Industrial-grade (–I suffix), same pinout, identical electrical specs except AEC-Q100 not applied | Lacks automotive PPAP, IMDS, and zero-defect manufacturing - suitable for non-automotive industrial inverters | Choose SI8631EC-BIS1 only if AEC-Q100 compliance and automotive traceability are not required. |
| ADUM3301ARWZ | 3-channel, 25 Mbps max rate, 3.75 kVRMS, SOIC-16WB; no selectable fail-safe mode (fixed default low) | Lower data rate limits use in high-speed SPI or isolated USB; fixed low-fail-safe may require external pull-ups for BMS compatibility | Choose ADUM3301ARWZ only if 25 Mbps suffices and default-low behavior aligns with system fault logic. |
Compared with SI8631EC-BIS1, SI8631EC-AS1R adds automotive process controls and documentation without changing footprint or timing; versus ADUM3301ARWZ, it doubles data rate and provides configurable fail-safe polarity critical for ASIL-B systems.
Availability
SI8631EC-AS1R is available at Aetrix Electronics and suitable for automotive battery management systems, traction inverter control, on-board chargers, and industrial motor drives requiring stable component supply across extended temperature and high-reliability lifecycles.
Supply support for SI8631EC-AS1R 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 automotive and industrial applications demanding high-speed, low-power, and safety-certified galvanic isolation - targeting EV powertrain, energy storage, and factory automation systems.
FAQ
What is the default output state of SI8631EC-AS1R during input-side power loss?
The SI8631EC-AS1R has a factory-configured high-fail-safe mode, meaning outputs B1 and B2 drive logic high when VDD1 is unpowered but VDD2 remains active. This behavior is defined by the "EC" ordering code and eliminates undefined states in safety-critical shutdown sequences - a key requirement for ISO 26262-compliant battery disconnect logic.
Does SI8631EC-AS1R support mixed supply voltages on VDD1 and VDD2?
Yes, SI8631EC-AS1R supports independent 2.5–5.5 V supplies on VDD1 and VDD2. For example, it can interface a 3.3 V microcontroller (VDD1) to a 5 V isolated ADC or gate driver (VDD2). The device maintains full timing specifications and noise immunity across all valid voltage combinations without level-shifting circuitry.
What is the creepage and clearance distance provided by the narrow-body SOIC-16 package of SI8631EC-AS1R?
The SI8631EC-AS1R in narrow-body SOIC-16 provides 8.0 mm creepage and clearance distances, meeting IEC 60664-1 requirements for reinforced insulation at 3.75 kVRMS. This enables compliance with end-equipment standards such as IEC 61010-1 (industrial) and IEC 60601-1 (medical) when properly implemented on PCB with appropriate spacing.
How does the enable pin functionality work on SI8631EC-AS1R?
SI8631EC-AS1R has two enable pins: EN1 (on VDD1 side) controls output A3, and EN2 (on VDD2 side) controls outputs B1/B2. When an enable pin is low, its associated outputs enter high-impedance state - enabling dynamic channel disabling for power sequencing or fault containment without redesigning the isolation barrier.
Is SI8631EC-AS1R compatible with 1.8 V logic interfaces?
No, SI8631EC-AS1R does not support 1.8 V logic. Its absolute minimum supply voltage is 2.5 V per side, and input thresholds (VT+ = 1.4–1.9 V, VT– = 1.0–1.4 V) are incompatible with 1.8 V CMOS levels. For 1.8 V systems, a level-shifter or alternative isolator with lower VDD min (e.g., Si88xx series) is required - SI8631EC-AS1R must be used with ≥2.5 V logic families.
SI8631EC-AS1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-AS1R FAQ
1.How can I place an order for SI8631EC-AS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631EC-AS1R 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-AS1R reliable?
The price and inventory of SI8631EC-AS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631EC-AS1R is usually 5 days.
3.What payment methods are accepted for SI8631EC-AS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631EC-AS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631EC-AS1R?
SI8631EC-AS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631EC-AS1R 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-AS1R?
For technical support, including SI8631EC-AS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631EC-AS1R requirements.
6.How does Aetrix verify that SI8631EC-AS1R is sourced from the original manufacturer or authorized distributors?
All SI8631EC-AS1R 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-AS1R meets industry standards.
7.What is the process for return or replacement of SI8631EC-AS1R?
All SI8631EC-AS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8631EC-AS1R, 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-AS1R part is unused and in its original packaging.
Return procedure for SI8631EC-AS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631EC-AS1R Tags
-
ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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