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Skyworks Solutions Inc. SI8635BT-AS
- Part No.:
- SI8635BT-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8635BT-AS.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:3,230
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Product details
Overview
SI8635BT-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 fail-safe low-default output state. It operates across –40 to +125 °C and supports dual 2.5–5.5 V supplies for isolated communication in high-noise traction inverter gate drivers.
For engineers reviewing the SI8635BT-AS datasheet, SI8635BT-AS pinout, SI8635BT-AS application, or SI8635BT-AS equivalent, this page delivers verified electrical specs, SOIC-16 wide-body package details, AEC-Q100 qualification evidence, and real-world timing performance for safety-critical automotive isolation design.
Technical Context
The SI8635BT-AS uses RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture provides independent input/output supply domains (VDD1/VDD2), Schmitt-trigger inputs, and no internal enable pins (EN1/EN2 not present per Si8635 family definition).
All three channels are unidirectional from Side A to Side B, with fail-safe behavior defined by ordering option: during VDD1 loss while VDD2 remains powered, outputs default to logic low. The device meets reinforced insulation requirements per VDE 0884-10 (10 kV surge capable) and IEC 60950-1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed CAN FD, SPI, and PWM feedback loops without oversampling or retiming. |
| Propagation Delay | 5–13 ns - enables sub-100 ns closed-loop response in motor control systems with minimal timing uncertainty. |
| Channel-Channel Skew | ≤2.5 ns - ensures synchronized sampling across three isolated signals (e.g., three-phase current sensing). |
| Common-Mode Transient Immunity | ≥60 kV/µs - maintains signal integrity during fast-switching events in 650 V+ SiC/GaN inverters. |
| Isolation Rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, supporting functional safety up to ASIL-B system level. |
| Supply Voltage Range | 2.5–5.5 V per side - allows direct interface with 3.3 V microcontrollers and 5 V gate drivers without level-shifting. |
| Operating Temperature | –40 to +125 °C - qualified per AEC-Q100 Grade 1, suitable for under-hood and powertrain environments. |
Pinout & Package
SI8635BT-AS 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 Side A logic and RF transmitter; bypassed with 0.1 µF capacitor near pin. |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8 mm PCB creepage for safety compliance. |
| A1, A2, A3 | Input data channels | Unidirectional CMOS inputs with Schmitt trigger (440 mV hysteresis) for noise rejection in noisy power stages. |
| VDD2 | Output-side power supply | Supplies Side B RF receiver and output drivers; independent of VDD1 for true galvanic isolation. |
| GND2 | Output-side ground reference | Return path for VDD2; forms isolation barrier boundary with GND1; requires physical separation per IEC 60664-1. |
| B1, B2, B3 | Isolated output data channels | CMOS outputs with 50 Ω nominal impedance; drive 15 pF loads directly; default low during VDD1 undervoltage. |
| NC | No-connect terminal | Pins 1, 2, 15, 16 are internally unconnected; may be left floating, tied to GND2, or used for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift; achieves stable timing over full automotive temperature range. |
| Selectable fail-safe output | Low-default state ensures safe shutdown of gate drivers when primary controller supply fails. |
| Reinforced VDE 0884-10 certification | Validated for 10 kV surge immunity and 60-year lifetime at rated working voltage-critical for EV traction systems. |
| Ultra-low power at 100 Mbps | 13.2 mA per side at 5 V (typical), reducing thermal load in densely packed power modules. |
| AEC-Q100 Grade 1 qualification | Full automotive process flow with zero-defect methodology and PPAP documentation support. |
Applications
| Motor Control Gate Driving | On-Board Charger (OBC) Feedback |
|---|---|
Use Scenario: Isolating PWM signals from MCU to three-phase SiC half-bridge gate drivers in EV traction inverters. IC Role / Device Role / Timing Role: Unidirectional signal isolator delivering synchronized, skew-controlled gate commands with fail-safe low default. Use Value: Enables <10 ns timing margin for 20 kHz switching with guaranteed channel-to-channel skew ≤2.5 ns. | Use Scenario: Transmitting isolated voltage/current sense data from secondary-side ADC to primary-side controller in bidirectional OBCs. IC Role / Device Role / Timing Role: High-CMTI (≥60 kV/µs) isolator preserving analog feedback integrity amid 100+ V/µs common-mode transients. Use Value: Maintains ADC accuracy under fast dv/dt conditions without external filtering or recalibration. |
| Battery Management System (BMS) | Traction Inverter Control Interface |
Use Scenario: Isolating cell monitoring IC communications across multiple battery module stacks in 800 V BEV packs. IC Role / Device Role / Timing Role: Reinforced 5 kVRMS isolator enabling safe inter-module UART/SPI links with ASIL-B compliance. Use Value: Meets VDE 0884-10 creepage requirements for >1000 V working voltage systems without additional spacing. | Use Scenario: Connecting MCU safety core to isolated watchdog and fault-reporting circuits in dual-core inverter controllers. IC Role / Device Role / Timing Role: Fail-safe isolator asserting safe state (low) on all three channels during MCU reset or brownout. Use Value: Eliminates need for external pull-down resistors or discrete logic to enforce safe default behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO7731FDWR | 3-channel, 100 Mbps, 3.75 kVRMS, non-automotive grade, SOIC-16 narrow body | Lacks AEC-Q100 qualification and VDE 0884-10 reinforcement; limited to industrial temperature range (–40 to 105 °C) | Acceptable for cost-sensitive non-automotive systems where 5 kVRMS and ASIL-B support are not required. |
| ADUM131D0BRWZ | 3-channel, 150 Mbps, 3.75 kVRMS, automotive-grade (AEC-Q100), SOIC-16 wide body | Lower isolation rating (3.75 vs. 5 kVRMS) and no VDE 0884-10 certification; CMTI = 75 kV/µs (higher than SI8635BT-AS) | Preferred where higher CMTI is critical but 5 kVRMS reinforced insulation is not mandated by end-system safety standard. |
Compared with ISO7731FDWR and ADUM131D0BRWZ, SI8635BT-AS uniquely combines AEC-Q100 Grade 1, VDE 0884-10 reinforced 5 kVRMS isolation, and fail-safe low-default operation-making it the only option qualified for ASIL-B traction inverter subsystems requiring both high voltage endurance and deterministic safe-state behavior.
Availability
SI8635BT-AS is available at Aetrix Electronics and suitable for automotive powertrain systems, battery management units, and on-board chargers requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SI8635BT-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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-reliability applications.
The Si863x family was designed specifically for automotive and industrial isolation needs-delivering ultra-low-power, high-speed, and safety-certified digital isolation in compact SOIC packages.
FAQ
What is the isolation rating and safety certification status of the SI8635BT-AS?
The SI8635BT-AS is certified for 5 kVRMS reinforced isolation per UL 1577 and VDE 0884-10, with surge capability up to 10 kV. It holds CSA Component Acceptance Notice 5A, IEC 60950-1/61010-1/60601-1 approvals, and CQC GB4943.1 certification-fully supporting ASIL-B system-level safety requirements in automotive traction applications.
Does the SI8635BT-AS require external components for basic operation?
Yes-the SI8635BT-AS requires two 0.1 µF ceramic bypass capacitors: one between VDD1 and GND1, and another between VDD2 and GND2, placed as close as possible to the respective pins. No pull-up/pull-down resistors are needed, as fail-safe behavior is implemented internally per the low-default ordering option.
How does the fail-safe mode function in the SI8635BT-AS during power loss?
When VDD1 (input-side supply) drops below UVLO threshold while VDD2 remains powered, the SI8635BT-AS drives all three outputs (B1–B3) to logic low within 12 ns. This behavior is hardwired per the "BT" ordering suffix and requires no external circuitry-ensuring safe gate driver disable in EV inverter fault conditions.
What is the maximum achievable data rate and timing consistency of the SI8635BT-AS?
The SI8635BT-AS supports up to 150 Mbps with guaranteed minimum pulse width of 5 ns. Propagation delay is 5–13 ns (typ. 8 ns), channel-to-channel skew ≤2.5 ns, and pulse width distortion ≤4.5 ns-enabling precise synchronization across all three channels for time-critical motor control loops.
Is the SI8635BT-AS pin-compatible with other members of the Si863x family?
Yes-SI8635BT-AS shares identical pinout and package (SOIC-16 wide body) with all Si8635 variants (e.g., SI8635BB-AS, SI8635BD-AS). Differences are limited to isolation rating (2.5/3.75/5 kVRMS) and default output state (low/high), which are set at manufacture and do not affect footprint or routing.
SI8635BT-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
SI8635BT-AS FAQ
1.How can I place an order for SI8635BT-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8635BT-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 SI8635BT-AS reliable?
The price and inventory of SI8635BT-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8635BT-AS is usually 5 days.
3.What payment methods are accepted for SI8635BT-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8635BT-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8635BT-AS?
SI8635BT-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8635BT-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 SI8635BT-AS?
For technical support, including SI8635BT-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8635BT-AS requirements.
6.How does Aetrix verify that SI8635BT-AS is sourced from the original manufacturer or authorized distributors?
All SI8635BT-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 SI8635BT-AS meets industry standards.
7.What is the process for return or replacement of SI8635BT-AS?
All SI8635BT-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8635BT-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 SI8635BT-AS part is unused and in its original packaging.
Return procedure for SI8635BT-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8635BT-AS 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
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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