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Skyworks Solutions Inc. SI8631ET-AS2
- Part No.:
- SI8631ET-AS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8631ET-AS2.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:2,386
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Product details
Overview
SI8631ET-AS2 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 5 kVRMS reinforced isolation in a wide-body SOIC-16 package. It features selectable high-default fail-safe mode, operates from 2.5–5.5 V supplies, and is AEC-Q100 qualified for automotive battery management and traction inverter systems.
For engineers reviewing the SI8631ET-AS2 datasheet, SI8631ET-AS2 pinout, SI8631ET-AS2 application, or SI8631ET-AS2 equivalent, this page delivers verified electrical specs, fail-safe behavior timing, CMTI performance (≥60 kV/µs), and automotive-grade supply voltage tolerance (–40°C to +125°C) critical for isolated gate driver interfaces and high-noise EV power stages.
Technical Context
The SI8631ET-AS2 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 VDDUV+ = 2.24 V (typ) and hysteresis of 70 mV (typ).
It integrates Schmitt-trigger inputs (VT+ = 1.67 V, VT– = 1.23 V, VHYS = 0.44 V typ), 50 Ω nominal output impedance, and dual enable inputs (EN1 on Side A, EN2 on Side B) allowing independent control of A3 and B1/B2 outputs-enabling flexible signal routing in motor control feedback loops and isolated ADC interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports real-time PWM and serial communication in high-speed motor drives and fast-loop isolated sensing. |
| Propagation Delay | 8.0 ns (typ) - enables sub-10 ns timing-critical isolation for IGBT/SiC gate drivers requiring tight dead-time control. |
| Isolation Rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, suitable for primary-secondary separation in on-board chargers and inverters. |
| CMTI | ≥60 kV/µs - maintains signal integrity during fast dV/dt transients in 800 V battery systems and SiC switching environments. |
| Supply Voltage Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting. |
| Default Output State | High (fail-safe) - ensures safe shutdown state in BMS fault conditions when VDD1 is lost but VDD2 remains active. |
| Operating Temperature | –40°C to +125°C - validated for under-hood automotive use per AEC-Q100 Grade 1 requirements. |
Pinout & Package
SI8631ET-AS2 is housed in a RoHS-compliant 16-pin wide-body SOIC package (7.5 mm creepage/clearance), rated for 5 kVRMS reinforced insulation and compatible with JEDEC J-STD-020 reflow profiles (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies logic and transmitter circuitry; UVLO threshold 2.24 V (typ); bypass requires 0.1 µF capacitor. |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8 mm creepage for reinforced isolation compliance. |
| A1, A2 | Input channels (Side A) | Digital inputs with Schmitt-trigger thresholds (1.23–1.67 V); tolerate 0–5.5 V logic levels; no external pull-up needed. |
| EN1 | Enable for A3 output | Active-high control: drives A3 into high-Z when low; internally pulled up; recommended to tie to VDD1 or logic level in noisy environments. |
| A3 | Output channel (Side A) | Isolated output referenced to VDD1/GND1; default high during VDD1 loss; 50 Ω output impedance. |
| VDD2 | Output-side power supply | Supplies receiver and output driver; independent UVLO; same 2.5–5.5 V range as VDD1. |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1; defines safety barrier between domains. |
| B1, B2 | Output channels (Side B) | Isolated outputs referenced to VDD2/GND2; default high during VDD1 loss; each sinks/sours ±4 mA. |
| EN2 | Enable for B1/B2 outputs | Active-high control: disables B1/B2 into high-Z when low; internal pull-up; decouples output activity from input faults. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; enables >60-year lifetime at rated working voltage with stable timing over –40°C to +125°C. |
| Selectably high-default fail-safe mode | Guarantees logic-high output on B1/B2 and A3 when VDD1 fails-critical for safe gate turn-off in traction inverters during MCU reset. |
| Independent dual-enable architecture | EN1 controls A3 only; EN2 controls B1/B2 only-supports asymmetric fault handling in multi-sensor BMS monitoring paths. |
| Ultra-low power at 100 Mbps | 9.9 mA (typ) on VDD1 + 13.4 mA (typ) on VDD2 at 100 Mbps-reduces thermal load in densely packed automotive power modules. |
| Reinforced VDE 0884-10 certification | Validated for 10 kV surge capability and 5 kVRMS working voltage-meets IEC 60601-1 and IEC 61800-5-1 for medical and industrial drive safety. |
Applications
| On-Board Charger (OBC) Control | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Isolating MCU PWM signals and status feedback between low-voltage control domain and 400–800 V DC-link stage. IC Role / Device Role / Timing Role: SI8631ET-AS2 transmits gate drive commands (A1→B1/B2) and returns isolated fault flags (B1/B2→A3) with <8 ns skew. Use Value: Enables precise dead-time control and fast fault response (<12 ns tSD) while maintaining 5 kVRMS barrier integrity during 10 kV surge events. |
Use Scenario: Isolating cell voltage monitoring ICs and pack contactor drivers in high-voltage battery packs. IC Role / Device Role / Timing Role: SI8631ET-AS2 carries isolated ADC data (A1/A2) and delivers contactor enable signals (B1/B2), with EN2 disabling outputs during overvoltage faults. Use Value: Prevents false triggering during transient noise; high-default fail-safe ensures contactors open safely if MCU supply collapses. |
| Traction Inverter Gate Drive | Industrial Motor Drive Interface |
|
Use Scenario: Providing isolated gate drive signals to SiC half-bridge modules in electric vehicle inverters. IC Role / Device Role / Timing Role: SI8631ET-AS2 delivers matched, low-skew PWM edges (0.4 ns channel-channel skew) to upper/lower gate drivers with CMTI ≥60 kV/µs. Use Value: Eliminates shoot-through risk during fast dV/dt switching (≥50 V/ns) and supports 150 Mbps update rates for predictive torque control. |
Use Scenario: Interfacing PLC controllers with isolated current/voltage sensors and IGBT gate drivers in factory automation. IC Role / Device Role / Timing Role: SI8631ET-AS2 routes encoder feedback (A1/A2) and isolates PWM outputs (B1/B2) across functional safety boundaries per IEC 61800-5-1. Use Value: Meets reinforced insulation requirements for 1000 VAC industrial mains; enables single-chip isolation for 3-channel feedback + control paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8631ED-AS | Same 2:1 channel count and 5 kVRMS rating, but default-low fail-safe output state. | Suitable where system safety logic requires active-low fault signaling or pull-down dominance during power loss. | Select SI8631ED-AS when hardware-level fault escalation mandates low-default behavior; SI8631ET-AS2 is preferred for high-default safety interlocks. |
| ADUM3301CRWZ | 3-channel, 25 Mbps max rate, 3.75 kVRMS, SOIC-16 narrow body; no AEC-Q100 qualification. | Limited to industrial automation or non-automotive isolated sensing where lower speed and reduced isolation margin are acceptable. | Choose ADUM3301CRWZ only for cost-sensitive, non-automotive designs with ≤25 Mbps bandwidth needs; SI8631ET-AS2 provides 6× speed and automotive qualification. |
Compared with SI8631ED-AS, SI8631ET-AS2 offers safer default-high behavior for gate driver disable paths; versus ADUM3301CRWZ, it delivers 6× higher data rate, 33% higher isolation, and full AEC-Q100 compliance-making it the only option qualified for OBC and traction inverter primary control loops.
Availability
SI8631ET-AS2 is available at Aetrix Electronics and suitable for automotive battery management systems, on-board chargers, and industrial motor drives requiring stable component supply, long-term lifecycle support, and traceable sourcing for ISO/TS 16949 production programs.
Supply support for SI8631ET-AS2 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 wireless, automotive, and industrial markets.
The SI8631ET-AS2 belongs to Skyworks' Si863x ultra-low-power digital isolator family, engineered specifically for high-reliability automotive and industrial applications demanding reinforced isolation, AEC-Q100 qualification, and sub-10 ns timing precision.
FAQ
What is the fail-safe default output state of SI8631ET-AS2?
The SI8631ET-AS2 is configured with a high-default fail-safe mode: when VDD1 is unpowered but VDD2 remains active, outputs B1, B2, and A3 default to logic high. This behavior is fixed by the "ET" ordering code and ensures safe shutdown in automotive power systems where loss of MCU supply must force gate drivers into off-state. SI8631ET-AS2 maintains this state within 12 ns (tSD) after VDD1 collapse.
Does SI8631ET-AS2 require external pull-up or pull-down resistors on its inputs?
No, SI8631ET-AS2 does not require external pull-up or pull-down resistors. Its Schmitt-trigger inputs have built-in hysteresis (0.44 V typ) and defined thresholds (VT+ = 1.67 V, VT– = 1.23 V), and the "ET" variant includes 10 µA internal pull-ups on all I/O pins. External resistors are unnecessary unless specific noise immunity enhancements are required in extreme EMI environments.
What is the maximum operating temperature range for SI8631ET-AS2?
The SI8631ET-AS2 is rated for continuous operation from –40°C to +125°C ambient temperature, fully qualified per AEC-Q100 Grade 1. This range is validated across all electrical parameters-including propagation delay (8.0 ns typ), CMTI (≥60 kV/µs), and supply current-ensuring reliable performance in under-hood automotive locations and industrial enclosures without derating.
How does the enable pin architecture work on SI8631ET-AS2?
SI8631ET-AS2 features two independent enable pins: EN1 controls only output A3 (Side A), and EN2 controls outputs B1/B2 (Side B). When EN1 = low, A3 enters high-impedance; when EN2 = low, B1/B2 enter high-Z. Both pins are internally pulled up, so they can be left floating-but tying them to VDD1/VDD2 or logic levels is recommended in noisy environments to prevent unintended tri-state transitions.
Is SI8631ET-AS2 certified for reinforced insulation per VDE 0884-10?
Yes, SI8631ET-AS2 is certified to VDE 0884-10 for reinforced insulation, supporting 5 kVRMS working voltage and 10 kV surge capability. This certification-alongside UL 1577, CSA 5A, and CQC approvals-validates its use in safety-critical applications such as IEC 61800-5-1 industrial drives and ISO 26262 ASIL-B automotive subsystems where single-fault tolerance is mandatory.
SI8631ET-AS2 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:
- Magnetic Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 3
- Inputs - Side 1/Side 2:
- 2/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 35kV/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
SI8631ET-AS2 FAQ
1.How can I place an order for SI8631ET-AS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631ET-AS2 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 SI8631ET-AS2 reliable?
The price and inventory of SI8631ET-AS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631ET-AS2 is usually 5 days.
3.What payment methods are accepted for SI8631ET-AS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631ET-AS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631ET-AS2?
SI8631ET-AS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631ET-AS2 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 SI8631ET-AS2?
For technical support, including SI8631ET-AS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631ET-AS2 requirements.
6.How does Aetrix verify that SI8631ET-AS2 is sourced from the original manufacturer or authorized distributors?
All SI8631ET-AS2 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 SI8631ET-AS2 meets industry standards.
7.What is the process for return or replacement of SI8631ET-AS2?
All SI8631ET-AS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8631ET-AS2, 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 SI8631ET-AS2 part is unused and in its original packaging.
Return procedure for SI8631ET-AS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631ET-AS2 Tags
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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
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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