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Skyworks Solutions Inc. SI8631ET-ASR
- Part No.:
- SI8631ET-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8631ET-ASR.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:1,531
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Product details
Overview
SI8631ET-ASR 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-ASR datasheet, SI8631ET-ASR pinout, SI8631ET-ASR application, or SI8631ET-ASR equivalent, this page delivers verified electrical specs, fail-safe behavior timing, CMTI performance (≥60 kV/µs), and automotive-grade supply voltage compatibility across –40°C to +125°C.
Technical Context
The SI8631ET-ASR implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering 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), 50 Ω nominal output impedance, and dual enable controls: EN1 governs output A3, EN2 governs outputs B1/B2-enabling selective channel disable into high-impedance state with ten2 ≤ 12 ns (typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed CAN FD, SPI, and isolated ADC interface clocking without oversampling. |
| Propagation Delay | 8.0 ns (typ) - enables sub-10 ns timing-critical feedback loops in motor control and power inverter gate drivers. |
| Isolation Rating | 5 kVRMS - meets reinforced insulation requirements per VDE 0884-10 and UL 1577 for 1-minute withstand. |
| Supply Voltage Range | 2.5–5.5 V - interoperable with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting. |
| CMTI | ≥60 kV/µs - maintains signal integrity during fast-switching transients in SiC/GaN power stages. |
| Fail-Safe Default | High - ensures safe logic-high output during VDD1 loss, critical for enabling gate drivers or fault signaling. |
| Operating Temperature | –40°C to +125°C - validated for under-hood automotive environments per AEC-Q100 Grade 1. |
Pinout & Package
SI8631ET-ASR uses a RoHS-compliant 16-pin wide-body SOIC package (7.5 mm creepage/clearance), rated for 5 kVRMS reinforced insulation and 10 kV surge capability per VDE 0884-10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to input logic and RF transmitter; UVLO threshold 2.24 V (rising). |
| GND1 | Input-side ground reference | Reference for all Side A signals; requires local 0.1 µF bypass capacitor. |
| A1, A2 | Digital input channels | Schmitt-trigger inputs with 0.44 V hysteresis-rejects >100 MHz noise in noisy motor drive environments. |
| EN1 | Enable control for A3 output | Logic-high enables A3; low or floating disables A3 into high-Z-used for dynamic channel gating. |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to RF receiver and output drivers; independent UVLO monitoring. |
| GND2 | Output-side ground reference | Galvanically isolated reference for Side B; must be physically separated from GND1 per creepage rules. |
| B1, B2 | Digital output channels | 50 Ω output impedance-matches controlled-impedance PCB traces to minimize reflections at 150 Mbps. |
| EN2 | Enable control for B1/B2 outputs | Logic-high enables B1/B2; low forces both into high-Z-supports hot-swap or diagnostic isolation. |
| A3 | Input-driven output (Side A → Side B) | Driven by A3 input when EN1 = high; defaults high during VDD1 loss per ET ordering option. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift-ensures stable 60-year lifetime at rated working voltage. |
| Selectably high-default fail-safe | Guarantees logic-high output on B1/B2/A3 when VDD1 fails-prevents unintended gate turn-off in EV inverters. |
| Channel-channel skew | 0.4 ns (typ)-enables precise multi-channel timing alignment for isolated PWM or encoder interfaces. |
| Low-power operation | 6.6 mA (typ) at 100 Mbps per side-reduces thermal load in compact automotive modules. |
| AEC-Q100 qualification | Grade 1 (–40°C to +125°C) with zero-defect manufacturing flow-meets OEM PPAP and IMDS/CAMDS requirements. |
Applications
| Battery Management Systems (BMS) | Traction Inverters |
|---|---|
|
Use Scenario: Isolating cell voltage monitoring and pack-level communication between high-voltage battery stacks and MCU. IC Role / Device Role / Timing Role: SI8631ET-ASR transmits isolated analog monitor data and safety fault signals across 500–800 V DC barriers. Use Value: 5 kVRMS reinforced isolation and ≥60 kV/µs CMTI prevent false triggering during high-dV/dt switching events. |
Use Scenario: Providing gate-drive signals to SiC MOSFET half-bridges while isolating MCU PWM and fault feedback. IC Role / Device Role / Timing Role: SI8631ET-ASR carries three independent signals: two PWMs (B1/B2) and one fault flag (A3), all with <10 ns delay. Use Value: Sub-10 ns propagation delay and 0.4 ns channel skew preserve dead-time integrity in 100 kHz+ switching inverters. |
| On-Board Chargers (OBC) | Charging Stations |
|
Use Scenario: Isolating bidirectional AC/DC control signals between primary-side controller and secondary-side DC bus management. IC Role / Device Role / Timing Role: SI8631ET-ASR conveys isolated current sense, voltage regulation, and thermal shutdown signals across galvanic barrier. Use Value: High-default fail-safe ensures gate drivers remain enabled during transient input brownouts-preventing uncontrolled discharge. |
Use Scenario: Interfacing isolated Ethernet or CAN FD communication between charging station controller and vehicle handshake protocol. IC Role / Device Role / Timing Role: SI8631ET-ASR isolates data lines while maintaining 150 Mbps throughput for real-time power negotiation. Use Value: 150 Mbps capability supports ISO 15118 Plug & Charge handshaking without protocol throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM1311ARWZ | 3-channel, 100 Mbps max, 2.5–5.5 V, 3.75 kVRMS, SOIC-16 narrow body | Lacks AEC-Q100 qualification and 5 kVRMS rating; lower CMTI (25 kV/µs) | Acceptable for industrial BMS where automotive qualification and 5 kVRMS are not required. |
| ISO7731FDWR | 3-channel, 100 Mbps max, 2.25–5.5 V, 5 kVRMS, SOIC-16 wide body, default-low only | No selectable high-default option; higher quiescent current (1.8 mA/ch @ 1 Mbps) | Suitable for cost-sensitive traction inverter designs needing 5 kVRMS but not high-default fail-safe. |
Compared with ADUM1311ARWZ and ISO7731FDWR, SI8631ET-ASR uniquely combines AEC-Q100 Grade 1, 150 Mbps speed, 5 kVRMS reinforced isolation, and factory-configured high-default fail-safe-making it optimal for next-generation EV powertrain systems requiring functional safety and high-speed diagnostics.
Availability
SI8631ET-ASR is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and charging stations requiring stable component supply across automotive production lifecycles.
Supply support for SI8631ET-ASR 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 automotive and industrial isolation-emphasizing AEC-Q100 compliance, 60-year lifetime, and RF-based architecture to replace optocouplers in demanding power electronics.
FAQ
What is the default output state of SI8631ET-ASR during VDD1 power loss?
The "ET" suffix in SI8631ET-ASR denotes factory-configured high-default fail-safe mode. When VDD1 is unpowered and VDD2 remains active, outputs B1, B2, and A3 default to logic high-ensuring safe-state behavior in automotive gate driver and fault-signaling applications. This is confirmed in Table 1.1 and Section 3.4 of the datasheet.
Does SI8631ET-ASR support 150 Mbps operation across its full temperature range?
Yes, SI8631ET-ASR guarantees up to 150 Mbps data rate over –40°C to +125°C, as specified in Table 4.2 (Timing Characteristics) and validated in Figure 3.6 (Propagation Delay vs. Temperature). Performance remains stable due to CMOS-based RF modulation-not temperature-sensitive like optocouplers.
How does the enable pin functionality differ between EN1 and EN2 on SI8631ET-ASR?
Per Table 3.2, EN1 controls only output A3 (Side A → Side B), while EN2 controls outputs B1 and B2 (Side B). Both pins accept logic high/low or float (internally pulled up), and driving either low places respective outputs into high-impedance state within ≤12 ns (ten2), enabling dynamic channel isolation during diagnostics or fault conditions.
What safety certifications apply to SI8631ET-ASR?
SI8631ET-ASR holds UL 1577 (5000 VRMS, 1 min), CSA Component Notice 5A, VDE 0884-10 (reinforced, 5 kVRMS), IEC 60950-1/61010-1/60601-1, CQC GB4943.1, and AEC-Q100 Grade 1 qualification-fully documented in Sections 1.1 and Safety Regulatory Approvals of the datasheet.
Can SI8631ET-ASR operate with mismatched supply voltages on VDD1 and VDD2?
Yes, SI8631ET-ASR supports independent 2.5–5.5 V supplies on VDD1 and VDD2-enabling level translation between 3.3 V MCUs and 5 V analog circuits. Electrical specs (e.g., VOH = VDDx – 0.4 V, VOL ≤ 0.4 V) are guaranteed across all valid combinations, as confirmed in Table 4.1 and Table 4.2.
SI8631ET-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm 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:
- 5000Vrms
- 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
SI8631ET-ASR FAQ
1.How can I place an order for SI8631ET-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631ET-ASR 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-ASR reliable?
The price and inventory of SI8631ET-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631ET-ASR is usually 5 days.
3.What payment methods are accepted for SI8631ET-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631ET-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631ET-ASR?
SI8631ET-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631ET-ASR 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-ASR?
For technical support, including SI8631ET-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631ET-ASR requirements.
6.How does Aetrix verify that SI8631ET-ASR is sourced from the original manufacturer or authorized distributors?
All SI8631ET-ASR 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-ASR meets industry standards.
7.What is the process for return or replacement of SI8631ET-ASR?
All SI8631ET-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8631ET-ASR, 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-ASR part is unused and in its original packaging.
Return procedure for SI8631ET-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631ET-ASR Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
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
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ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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