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Skyworks Solutions Inc. SI8631ET-IS2
- Part No.:
- SI8631ET-IS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8631ET-IS2.pdf
- Description:
- LINEAR IC'S
- Quantity:
- Payment:
- Shipping:
Inventory:3,782
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Product details
Overview
SI8631ET-IS2 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 certified to UL, VDE, CSA, and CQC standards for industrial and automotive systems requiring robust galvanic separation.
For engineers reviewing the SI8631ET-IS2 datasheet, SI8631ET-IS2 pinout, SI8631ET-IS2 application, or SI8631ET-IS2 equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade compatibility (AEC-Q100), exact isolation rating (5 kVRMS), and real-world timing performance - all critical for motor control, isolated power supply feedback, and battery management system design.
Technical Context
The SI8631ET-IS2 implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling deterministic signal transfer without clock recovery or handshake protocols. Its architecture delivers sub-10 ns propagation delay with ≤0.5 ns channel-to-channel skew and 35–50 kV/µs common-mode transient immunity (CMTI) under 1500 VCM stress.
It supports independent undervoltage lockout (UVLO) on both sides (VDD1/VDD2), with fail-safe default-high output behavior during input-side power loss. The device integrates Schmitt-trigger inputs for noise immunity and requires only 0.1 µF bypass capacitors per supply rail - no external transformers or optocoupler bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - enables high-speed serial interfaces (e.g., isolated SPI, RS-485 transceiver control, fast ADC/DAC clocking). |
| Propagation Delay | 5–13 ns (typ. 8 ns) - ensures tight timing alignment in closed-loop motor control and real-time power converter feedback paths. |
| Isolation Rating | 5 kVRMS reinforced - meets IEC 60950-1 and IEC 61010-1 requirements for safety-critical industrial and medical 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-shifting. |
| Channel Configuration | 2 inputs / 1 output (VDD1→VDD2 direction) - optimized for asymmetric signal routing such as isolated gate driver enable + fault feedback. |
| CMTI | ≥50 kV/µs - maintains signal integrity in high-dV/dt environments like traction inverters and SiC/GaN power stages. |
| Fail-Safe Default | High - guarantees active-high enable or fault-clear state during VDD1 loss, critical for safe shutdown in BMS and OBC designs. |
Pinout & Package
SI8631ET-IS2 is housed in a RoHS-compliant 16-pin wide-body SOIC package (7.5 mm creepage/clearance), rated for –40°C to +125°C operation and qualified to AEC-Q100 Grade 1. The package supports reinforced insulation and withstands 10 kV surge per VDE 0884-10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies logic and transmitter circuitry; UVLO threshold 2.24 V (typ.) ensures clean startup above brownout. |
| GND1 | Input-side ground reference | Reference for VI, EN1, and internal RF oscillator; must be separated from GND2 by ≥8 mm PCB clearance. |
| INA | Input A (channel 1) | Schmitt-triggered, 1.67 V typical VT+ - rejects >400 mV noise spikes on industrial bus lines. |
| INB | Input B (channel 2) | Independent input with same noise-immune threshold; used for dual-control signals or redundant sensing. |
| EN1 | Enable for output A3 | Active-high control: drives A3 into Hi-Z when low - enables multiplexed or conditional signal routing. |
| VDD2 | Output-side power supply | Supplies receiver and output drivers; independent UVLO allows output-side power sequencing flexibility. |
| GND2 | Output-side ground reference | Reference for VO, EN2, and demodulator; galvanically isolated from GND1 per safety certification. |
| OUTA | Output A3 (fail-safe high) | Default-high during VDD1 loss; drives 4 mA sink at 0.4 V - directly interfaces with MCU GPIO or gate driver inputs. |
| OUTB | Output B1 | Isolated replica of INA; 50 Ω nominal output impedance - matches controlled-impedance PCB traces for <150 Mbps signals. |
| OUTC | Output B2 | Isolated replica of INB; identical timing and drive strength to OUTB - ensures matched channel skew ≤0.5 ns. |
| EN2 | Enable for outputs B1/B2 | Active-high control: disables both B1/B2 simultaneously - useful for synchronized isolation domain gating. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; enables 60-year life at rated working voltage. |
| Selectable fail-safe output | Factory-configured high-default state ensures predictable behavior during input-side power failure in safety-critical systems. |
| Ultra-low power at 100 Mbps | 6.6–9.9 mA per side at 100 Mbps (2.5–5.5 V) - reduces thermal load in dense power modules and battery-powered gate drivers. |
| Reinforced VDE 0884-10 certification | Validated 10 kV surge capability and 5 kVRMS working voltage - satisfies reinforced insulation requirements for EV traction inverters. |
| Automotive-grade qualification | AEC-Q100 Grade 1, PPAP-supported, IMDS/CAMDS listed - enables direct use in on-board chargers and battery management systems. |
Applications
| Motor Control Systems | Isolated Switch-Mode Power Supplies |
|---|---|
|
Use Scenario: Gate driving for three-phase IGBT/SiC inverters with isolated current/voltage sensing. IC Role / Device Role / Timing Role: Isolates PWM enable (EN1) and fault feedback (OUTA) while replicating controller signals (OUTB/OUTC) with <0.5 ns skew. Use Value: Enables precise dead-time control and fast fault response (<12 ns tSD) without optocoupler latency or aging. |
Use Scenario: Secondary-side feedback loop in isolated DC-DC converters for server PSUs and telecom rectifiers. IC Role / Device Role / Timing Role: Transfers error amplifier output and synchronous rectifier timing across isolation barrier with 8 ns typ. propagation delay. Use Value: Maintains loop stability at >1 MHz switching frequencies while meeting reinforced insulation requirements (5 kVRMS). |
| Battery Management Systems | Industrial Automation Interfaces |
|
Use Scenario: Cell monitoring and pack-level communication in EV battery packs with distributed voltage sensing. IC Role / Device Role / Timing Role: Isolates MCU command (INA/INB) and cell-balancing status (OUTA) with fail-safe high default during main battery disconnect. Use Value: Guarantees safe open-circuit state on balancer FETs during power loss - prevents uncontrolled discharge or thermal runaway. |
Use Scenario: Digital I/O isolation between PLC CPU and field I/O modules in harsh factory environments. IC Role / Device Role / Timing Role: Provides noise-immune signal transfer for discrete inputs (INA/INB) and relay outputs (OUTB/OUTC) with 50 kV/µs CMTI. Use Value: Eliminates ground-loop interference and EFT-induced glitches in 24 V DC control systems operating near VFDs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM131D0BRWZ | 3-channel, 150 Mbps, 3.75 kVRMS, narrow-body SOIC-16, default-low fail-safe | Lacks AEC-Q100 qualification and 5 kVRMS rating; unsuitable for automotive traction systems | Prefer SI8631ET-IS2 where reinforced 5 kVRMS isolation and automotive qualification are mandatory. |
| ISO6731QDR | 3-channel, 50 Mbps, 5 kVRMS, SOIC-16, default-high, non-automotive | Lower data rate limits use in high-speed SPI or fast ADC interfaces; no AEC-Q100 support | Choose SI8631ET-IS2 for 150 Mbps links in OBCs or inverters requiring automotive-grade reliability. |
Compared with ADUM131D0BRWZ and ISO6731QDR, SI8631ET-IS2 uniquely combines 150 Mbps speed, 5 kVRMS reinforced isolation, AEC-Q100 Grade 1 qualification, and factory-configured default-high fail-safe - making it the only option qualified for high-voltage EV subsystems demanding both performance and functional safety.
Availability
SI8631ET-IS2 is available at Aetrix Electronics and suitable for motor control systems, isolated switch-mode power supplies, and battery management systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SI8631ET-IS2 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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-performance wireless and power systems.
The SI863x family was designed specifically for replacing optocouplers in industrial, medical, and automotive applications - delivering higher speed, lower power, longer life, and superior noise immunity than legacy isolation methods.
FAQ
What is the isolation rating and certification status of SI8631ET-IS2?
SI8631ET-IS2 provides 5 kVRMS reinforced isolation and is certified to UL 1577, CSA Component Notice 5A, VDE 0884-10 (reinforced), IEC 60950-1, IEC 61010-1, and CQC GB4943.1. These certifications validate its use in safety-critical industrial and automotive applications where galvanic separation must withstand sustained high voltage and transient surges.
Does SI8631ET-IS2 support AEC-Q100 qualification and automotive production documentation?
Yes, SI8631ET-IS2 is AEC-Q100 Grade 1 qualified and supported with AIAG-compliant PPAP documentation, IMDS and CAMDS listings, and zero-defect manufacturing flows - confirming its suitability for on-board chargers, battery management systems, and traction inverters in electric vehicles.
What is the channel configuration and fail-safe behavior of SI8631ET-IS2?
SI8631ET-IS2 has two input channels (INA, INB) on the VDD1 side and one output channel (OUTA) plus two bidirectional output channels (OUTB, OUTC) on the VDD2 side. Its ordering code "ET" specifies a factory-configured default-high fail-safe mode - meaning OUTA asserts logic high when VDD1 is unpowered, ensuring safe-state signaling in BMS and OBC designs.
How does SI8631ET-IS2 achieve noise immunity in high-dV/dt environments?
SI8631ET-IS2 achieves ≥50 kV/µs common-mode transient immunity (CMTI) through its RF-based modulation scheme and differential receiver architecture. This performance is validated per VDE 0884-10 test conditions (1500 VCM step) and enables reliable operation in SiC/GaN inverter gate driver circuits where rapid voltage transients would disrupt optocouplers or capacitive isolators.
What are the supply voltage and temperature operating ranges for SI8631ET-IS2?
SI8631ET-IS2 operates from 2.5 V to 5.5 V on both VDD1 and VDD2 supplies and is rated for ambient temperatures from –40°C to +125°C. Its UVLO thresholds (2.24 V typ. rising, 2.16 V typ. falling) ensure robust startup and shutdown behavior across this full range, supporting deployment in under-hood automotive and industrial control cabinet environments.
SI8631ET-IS2 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:
- Capacitive 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):
- 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-IS2 FAQ
1.How can I place an order for SI8631ET-IS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631ET-IS2 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-IS2 reliable?
The price and inventory of SI8631ET-IS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631ET-IS2 is usually 5 days.
3.What payment methods are accepted for SI8631ET-IS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631ET-IS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631ET-IS2?
SI8631ET-IS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631ET-IS2 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-IS2?
For technical support, including SI8631ET-IS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631ET-IS2 requirements.
6.How does Aetrix verify that SI8631ET-IS2 is sourced from the original manufacturer or authorized distributors?
All SI8631ET-IS2 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-IS2 meets industry standards.
7.What is the process for return or replacement of SI8631ET-IS2?
All SI8631ET-IS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8631ET-IS2, 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-IS2 part is unused and in its original packaging.
Return procedure for SI8631ET-IS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631ET-IS2 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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