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Skyworks Solutions Inc. SI8635ET-AS
- Part No.:
- SI8635ET-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8635ET-AS.pdf
- Description:
- AUTOMOTIVE 4 CHANNELS 5 KV ISOLA
- Quantity:
- Payment:
- Shipping:
Inventory:1,767
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Product details
Overview
SI8635ET-AS from Skyworks is an automotive-grade triple-channel digital isolator with reinforced 5 kVRMS isolation, 150 Mbps data rate, <10 ns propagation delay, and selectable high-default fail-safe output mode. It operates across –40 to +125 °C and supports 2.5–5.5 V dual supplies, enabling robust signal isolation in high-noise traction inverter gate drive circuits.
For engineers reviewing the SI8635ET-AS datasheet, SI8635ET-AS pinout, SI8635ET-AS application, or SI8635ET-AS equivalent, this page delivers verified electrical specs, SOIC-16 wide-body package details, AEC-Q100 qualification status, and validated alternative options for automotive BMS and OBC designs.
Technical Context
The SI8635ET-AS implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering superior CMTI (≥60 kV/µs) versus optocouplers. Its three unidirectional channels all reside on the VDD1 side as inputs and VDD2 side as outputs, with no enable pins (EN1/EN2 = NC per Table 3.2).
It features Schmitt-trigger inputs for noise immunity, precise timing (0.5 ns channel-channel skew, 2 ns propagation delay skew), and failsafe operation where powered VDD2 maintains logic-high outputs during VDD1 loss-critical for safe shutdown in EV power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 3 unidirectional, input-side (VDD1) to output-side (VDD2) |
| Max Data Rate | 150 Mbps - supports high-speed SPI, CAN FD, and PWM feedback in inverters |
| Isolation Rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577 for functional safety compliance |
| Propagation Delay | 5–13 ns - enables sub-100 ns loop timing in motor control gate drivers |
| Supply Voltage Range | 2.5–5.5 V per side - interoperable with 3.3 V MCU logic and 5 V gate driver supplies |
| Operating Temperature | –40 to +125 °C - qualified per AEC-Q100 Grade 0 for under-hood automotive use |
| CMTI | ≥60 kV/µs - prevents false triggering during fast dv/dt transients in SiC/GaN power stages |
Pinout & Package
SI8635ET-AS uses a RoHS-compliant 16-pin wide-body SOIC package (7.5 mm creepage/clearance), optimized for reinforced insulation in high-voltage automotive systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for channel inputs A1–A3 and internal transmitter; bypass with 0.1 µF capacitor |
| GND1 | Input-side ground | Reference for A1–A3 inputs; separate from GND2 to maintain isolation barrier integrity |
| A1–A3 | Input signals | CMOS/Schmitt-trigger inputs accepting 2.5–5.5 V logic; no external pull-up/down required |
| VDD2 | Output-side supply | Power for outputs B1–B3 and internal receiver; independent of VDD1 |
| GND2 | Output-side ground | Reference for B1–B3 outputs; galvanically isolated from GND1 |
| B1–B3 | Isolated outputs | Push-pull CMOS outputs with 50 Ω nominal impedance; default high during VDD1 loss |
| NC | No-connect | Pins 10, 11, 15, 16 - unused; may be left floating or tied to GND/VDD2 per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 0 qualified with full automotive process flow and PPAP documentation support |
| Fail-safe output mode | Default-high output state when VDD1 is unpowered - ensures safe gate-off in inverter fault conditions |
| Ultra-low power at speed | 9.3 mA per side at 100 Mbps / 3.3 V - reduces thermal load in sealed OBC enclosures |
| High CMTI immunity | 60 kV/µs common-mode transient immunity - sustains reliable operation during 1000 V/µs bus transients |
| Timing precision | 0.5 ns max channel-to-channel skew - enables synchronized sampling across multiple isolated ADC channels |
Applications
| Motor Control Gate Driving | On-Board Charger (OBC) Feedback |
|---|---|
Use Scenario: Isolating PWM signals from MCU to high-side/low-side IGBT/SiC gate drivers in traction inverters. IC Role / Device Role / Timing Role: Unidirectional signal isolator providing 5 kVRMS reinforcement between control and power domains. Use Value: Enables <10 ns propagation delay and 0.5 ns channel skew for precise dead-time control and reduced shoot-through risk. | Use Scenario: Transmitting voltage/current sense data from isolated DC-link side to MCU in bidirectional OBCs. IC Role / Device Role / Timing Role: High-speed digital isolator for isolated SPI or parallel ADC outputs in 650 V+ systems. Use Value: 150 Mbps capability supports oversampled current sensing at >1 MSPS without bottlenecking. |
| Battery Management System (BMS) | Traction Inverter Safety Monitoring |
Use Scenario: Isolating cell monitoring IC communication (e.g., LTC6813 daisy-chain) from main controller in high-voltage battery packs. IC Role / Device Role / Timing Role: Triple-channel isolator handling three independent data lines (CLK, DATA, CS) with shared VDD2 domain. Use Value: Reinforced 5 kVRMS rating meets IEC 61000-4-5 surge requirements for 800 V battery architectures. | Use Scenario: Isolating fault signals (overtemperature, overcurrent, desaturation) from power module to safety MCU in ASIL-D inverter designs. IC Role / Device Role / Timing Role: Fail-safe isolator asserting logic-high on B1–B3 when VDD1 collapses during primary-side failure. Use Value: Default-high behavior enables immediate hardware-level shutdown without software intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8635BD-AS | Same 3-channel, 5 kVRMS, wide-body SOIC, but default-low fail-safe mode | Suitable where safety logic requires active-low fault assertion or MCU reset signaling | Select SI8635BD-AS if system architecture mandates low-default outputs during input-side power loss |
| ISO7731FDWR | TI device: 3-channel, 5000 VRMS, 100 Mbps max, SOIC-16 wide, default-low only | Lacks AEC-Q100 Grade 0 qualification; rated for industrial –40 to +125 °C but not automotive PPAP | Choose ISO7731FDWR only for non-automotive industrial inverters where AEC-Q100 is not mandated |
Compared with SI8635ET-AS, SI8635BD-AS provides identical isolation and timing but inverted fail-safe polarity-making it a direct functional alternative where logic inversion is acceptable. ISO7731FDWR offers comparable isolation rating but lacks automotive qualification and 150 Mbps capability, limiting its use to lower-speed, non-safety-critical applications.
Availability
SI8635ET-AS is available at Aetrix Electronics and suitable for traction inverters, on-board chargers, and battery management systems requiring stable component supply with automotive-grade traceability and long-term lifecycle support.
Supply support for SI8635ET-AS 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-delivering ultra-low power, AEC-Q100 qualification, and reinforced 5 kVRMS performance in compact SOIC packages.
FAQ
What is the fail-safe output behavior of the SI8635ET-AS during input-side power loss?
The SI8635ET-AS asserts logic-high on all three outputs (B1–B3) when VDD1 is unpowered but VDD2 remains active. This default-high behavior is factory-configured and enables immediate hardware-level fault response in automotive traction inverters without MCU intervention. The SI8635ET-AS achieves this via internal pull-up circuitry specified in Table 3.1 of the datasheet.
Does the SI8635ET-AS require external pull-up or pull-down resistors on its input or output pins?
No, the SI8635ET-AS does not require external pull-up or pull-down resistors. Its Schmitt-trigger inputs have built-in hysteresis, and the default-high outputs include internal 10 µA pull-ups per the Si86xxxT series specification. External termination is only needed for controlled-impedance transmission lines when driving >15 pF loads at >50 Mbps.
What is the maximum data rate supported by the SI8635ET-AS, and under what conditions is it guaranteed?
The SI8635ET-AS supports up to 150 Mbps maximum data rate, guaranteed across the full operating temperature range (–40 to +125 °C) and supply voltage range (2.5–5.5 V per side). This rating is validated per Figure 4.2 and Table 4.2 in the official Skyworks datasheet revision 206522A, with pulse widths ≥5 ns.
How does the SI8635ET-AS differ from the SI8635BB-AS in terms of isolation rating and application suitability?
The SI8635ET-AS provides 5 kVRMS reinforced isolation certified to VDE 0884-10, while the SI8635BB-AS offers only 2.5 kVRMS basic isolation. This makes the SI8635ET-AS suitable for ASIL-B/C traction inverter subsystems and 800 V battery architectures, whereas SI8635BB-AS is limited to lower-voltage auxiliary systems like HVAC controls.
Is the SI8635ET-AS pin-compatible with other members of the Si863x family, such as the SI8630ET-AS?
Yes, the SI8635ET-AS is pin-compatible with all Si863x variants in the SOIC-16 wide-body package-including SI8630ET-AS and SI8631ET-AS-as confirmed by Table 1.1 and Package Outline Figure 6 in the datasheet. All share identical pin count, pinout, and footprint, differing only in channel count and directionality (SI8635 = 3× unidirectional input→output).
SI8635ET-AS 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:
- No
- 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-AS FAQ
1.How can I place an order for SI8635ET-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8635ET-AS 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-AS reliable?
The price and inventory of SI8635ET-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8635ET-AS is usually 5 days.
3.What payment methods are accepted for SI8635ET-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8635ET-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8635ET-AS?
SI8635ET-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8635ET-AS 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-AS?
For technical support, including SI8635ET-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8635ET-AS requirements.
6.How does Aetrix verify that SI8635ET-AS is sourced from the original manufacturer or authorized distributors?
All SI8635ET-AS 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-AS meets industry standards.
7.What is the process for return or replacement of SI8635ET-AS?
All SI8635ET-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8635ET-AS, 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-AS part is unused and in its original packaging.
Return procedure for SI8635ET-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8635ET-AS 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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