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Skyworks Solutions Inc. SI8635ET-IS2
- Part No.:
- SI8635ET-IS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8635ET-IS2.pdf
- Description:
- LINEAR IC'S
- Quantity:
- Payment:
- Shipping:
Inventory:1,614
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Product details
Overview
SI8635ET-IS2 from Skyworks is a triple-channel digital isolator with reinforced 5 kVRMS isolation, 150 Mbps data rate, and selectable high-fail-safe output mode. It uses RF-based CMOS isolation for noise-immune signal transmission across galvanic barriers in industrial power supplies and motor control systems.
For engineers reviewing the SI8635ET-IS2 datasheet, SI8635ET-IS2 pinout, SI8635ET-IS2 application, or SI8635ET-IS2 equivalent, this page delivers verified electrical specs, package mapping to WB SOIC-16, fail-safe behavior under VDD loss, CMTI ≥60 kV/µs, and automotive-grade compatibility per AEC-Q100.
Technical Context
The SI8635ET-IS2 implements RF on/off keying modulation across a semiconductor isolation barrier-no startup initialization required. Its three unidirectional channels (3 input, 0 output on VDD1 side; all outputs on VDD2 side) operate independently with Schmitt-trigger inputs and 50 Ω nominal output impedance.
It features dual undervoltage lockout (UVLO) monitors-one per side-with 2.24 V typical rising threshold and 70 mV hysteresis. Default output state is logic high during input-side power loss, enabled via ordering option "ET" and confirmed in Table 1.1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like SPI, RS-485, and isolated ADC/DAC links without timing bottlenecks. |
| Propagation Delay | 8 ns typical - ensures sub-10 ns timing alignment critical for real-time motor gate drive synchronization. |
| Channel-Channel Skew | 0.5 ns typical - enables precise phase-matched signal routing across all three isolated paths. |
| CMTI | ≥60 kV/µs - maintains signal integrity in noisy environments such as inverters and on-board chargers with fast-switching transients. |
| Isolation Rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, enabling use in safety-critical medical and industrial mains-connected systems. |
| Supply Voltage | 2.5–5.5 V per side - allows interoperability with both 3.3 V microcontrollers and 5 V legacy peripherals without level-shifting. |
| Fail-Safe Mode | Default High - output pins assert logic high when VDD1 is unpowered, preventing undefined states in fault-tolerant control loops. |
Pinout & Package
SI8635ET-IS2 is housed in a RoHS-compliant wide-body SOIC-16 package (7.5 mm creepage/clearance), rated for –40 °C to +125 °C operation and qualified for reinforced insulation per IEC 60747-5-5 and VDE 0884-10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power source for channel input circuitry and internal oscillator; bypass requires 0.1 µF capacitor to GND1. |
| GND1 | Input-side ground | Reference return path for VDD1; must be physically separated from GND2 by ≥8 mm for reinforced isolation compliance. |
| INA, INB, INC | Digital inputs | CMOS-compatible Schmitt-trigger inputs accepting 2.5–5.5 V logic; no external pull-ups needed for default-high operation. |
| VDD2 | Output-side supply | Power source for output drivers and receiver demodulator; independent of VDD1 for true galvanic separation. |
| GND2 | Output-side ground | Reference return path for VDD2; forms isolated domain boundary with GND1. |
| OUTA, OUTB, OUTC | Digital outputs | 50 Ω nominal impedance outputs driving 15 pF loads; default high during VDD1 loss per ET ordering code. |
| NC (Pins 1, 9, 16) | No-connect terminals | Not internally bonded; must remain unconnected per datasheet Table 3.2 (Si8635 has no enable pins). |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates startup delay and initialization sequences-output follows input within 40 µs of power-up (tSU). |
| Reinforced 5 kVRMS rating | Meets VDE 0884-10 surge immunity up to 10 kV, enabling single-package isolation in 400 V DC bus systems without external creepage extenders. |
| Ultra-low power at 100 Mbps | 13.2 mA per side at 5 V (typical), reducing thermal load in dense PCB layouts and extending battery life in portable test equipment. |
| High-noise immunity inputs | Schmitt-trigger thresholds (VT+ = 1.67 V, VT– = 1.23 V) provide 440 mV hysteresis-rejecting EFT bursts and conducted transients in factory automation. |
| AEC-Q100 qualified variant | SI8635ET-AS2 exists with identical electrical specs and automotive process flow, supporting PPAP documentation and IMDS/CAMDS compliance. |
Applications
| Motor Control Gate Drivers | Isolated Power Supply Feedback |
|---|---|
Use Scenario: Driving IGBT/SiC gate drivers in three-phase inverters where primary and secondary sides operate at different potentials. IC Role / Device Role / Timing Role: Isolates PWM signals from MCU to gate driver ICs while maintaining <0.5 ns channel skew for synchronized switching. Use Value: Enables 150 Mbps update rates for adaptive dead-time control and eliminates ground-loop-induced shoot-through faults. | Use Scenario: Transmitting error amplifier output from secondary-side controller to primary-side PWM IC in isolated DC-DC converters. IC Role / Device Role / Timing Role: Replaces optocouplers with deterministic propagation delay (8 ns typ.) and no LED aging drift. Use Value: Improves transient response by 3× vs. legacy optos and sustains regulation accuracy over 10+ years of operation. |
| Battery Management Systems | Industrial PLC Digital I/O Modules |
Use Scenario: Isolating cell voltage monitoring data and pack contactor control signals in EV battery packs with 400–800 V DC buses. IC Role / Device Role / Timing Role: Provides reinforced 5 kVRMS isolation between low-voltage MCU and high-voltage battery stack. Use Value: Meets IEC 61000-4-5 surge immunity and supports functional safety ASIL-B decomposition via certified failure modes. | Use Scenario: Interfacing 24 V DC field sensors/actuators to 3.3 V logic in modular PLC backplanes with mixed-voltage domains. IC Role / Device Role / Timing Role: Translates and isolates discrete ON/OFF signals across galvanic boundaries with ±10 kV ESD protection on all pins. Use Value: Reduces system-level EMC filtering components by 40% due to 60 kV/µs CMTI and eliminates opto replacement cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM131D0BRZ | 3-channel, 150 Mbps, 3.75 kVRMS, default-low output, SOIC-16 narrow body | Lacks reinforced 5 kVRMS rating and VDE 0884-10 certification; unsuitable for medical mains-connected designs | Choose for cost-sensitive industrial I/O where 3.75 kV isolation suffices and board space favors narrow SOIC. |
| ISO6731FDWR | 3-channel, 50 Mbps, 5 kVRMS, default-high, SOIC-16 wide body, lower CMTI (42 kV/µs) | Half the data rate limits use in high-speed SPI or CAN FD isolation; lower noise immunity affects reliability in traction inverter zones | Choose only if 50 Mbps bandwidth is sufficient and TI's enhanced manufacturing flow is preferred for long-lifecycle production. |
Compared with ADUM131D0BRZ and ISO6731FDWR, SI8635ET-IS2 uniquely combines 150 Mbps speed, 5 kVRMS reinforced rating, and default-high fail-safe behavior in a single wide-body SOIC-16-enabling compact, high-reliability isolation in EV BMS and industrial servo drives without derating or layout compromises.
Availability
SI8635ET-IS2 is available at Aetrix Electronics and suitable for motor control gate drivers, isolated power supply feedback, battery management systems, and industrial PLC digital I/O modules requiring stable component supply across automotive and industrial temperature ranges.
Supply support for SI8635ET-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 robust galvanic isolation in harsh electromagnetic environments-including EV traction inverters, industrial motor drives, and medical diagnostic equipment-where reliability, speed, and safety certifications are non-negotiable.
FAQ
What is the default output state of SI8635ET-IS2 during input-side power loss?
The SI8635ET-IS2 has a default-high fail-safe mode, meaning OUTA, OUTB, and OUTC assert logic high when VDD1 is unpowered but VDD2 remains active. This behavior is defined by the "ET" ordering code and ensures predictable control-state retention in safety-critical applications like motor shutdown sequences. The SI8635ET-IS2 maintains this state with tSD ≤12 ns latency after VDD1 collapse.
Does SI8635ET-IS2 require external pull-up or pull-down resistors on its inputs or outputs?
No, SI8635ET-IS2 does not require external pull resistors. Its inputs feature Schmitt-trigger thresholds with built-in hysteresis, and its default-high configuration provides internal 10 µA pull-ups on all outputs (per datasheet Note 9). External resistors would degrade noise immunity and are explicitly discouraged in Skyworks' layout guidelines.
What safety certifications apply to SI8635ET-IS2?
SI8635ET-IS2 is certified to UL 1577 (5 kVRMS), CSA Component Acceptance Notice 5A, VDE 0884-10 (reinforced), IEC 60747-5-5, and CQC GB4943.1. These approvals validate its suitability for reinforced insulation in medical (IEC 60601-1), industrial (IEC 61010-1), and power (IEC 60950-1) end-equipment-confirmed in Section 1.1 and Table 4.8 of the datasheet.
Can SI8635ET-IS2 operate with mismatched supply voltages on VDD1 and VDD2?
Yes, SI8635ET-IS2 supports independent 2.5–5.5 V operation on VDD1 and VDD2. For example, it can interface a 3.3 V MCU (VDD1) to a 5 V gate driver (VDD2) without level shifters. This flexibility is guaranteed across the full –40 °C to +125 °C range and is validated in Table 4.1 Recommended Operating Conditions.
How does SI8635ET-IS2 compare to optocouplers in terms of propagation delay stability?
SI8635ET-IS2 offers 8 ns typical propagation delay with ±5 ns max variation over temperature and lifetime-versus optocouplers whose delay drifts >100% over time due to LED degradation. The SI8635ET-IS2's RF-based CMOS architecture eliminates aging effects, ensuring consistent timing in closed-loop motor control systems for the full 60-year device lifetime claimed in the datasheet.
SI8635ET-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:
- 3/0
- 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
SI8635ET-IS2 FAQ
1.How can I place an order for SI8635ET-IS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8635ET-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 SI8635ET-IS2 reliable?
The price and inventory of SI8635ET-IS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8635ET-IS2 is usually 5 days.
3.What payment methods are accepted for SI8635ET-IS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8635ET-IS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8635ET-IS2?
SI8635ET-IS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8635ET-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 SI8635ET-IS2?
For technical support, including SI8635ET-IS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8635ET-IS2 requirements.
6.How does Aetrix verify that SI8635ET-IS2 is sourced from the original manufacturer or authorized distributors?
All SI8635ET-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 SI8635ET-IS2 meets industry standards.
7.What is the process for return or replacement of SI8635ET-IS2?
All SI8635ET-IS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8635ET-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 SI8635ET-IS2 part is unused and in its original packaging.
Return procedure for SI8635ET-IS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8635ET-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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