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Skyworks Solutions Inc. SI8635BT-AS2
- Part No.:
- SI8635BT-AS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8635BT-AS2.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:1,968
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Product details
Overview
SI8635BT-AS2 from Skyworks is a triple-channel, automotive-grade digital isolator with reinforced 5 kVRMS isolation, 150 Mbps data rate, and selectable fail-safe low-default output state. It operates across –40 to +125 °C and supports 2.5–5.5 V dual supplies on isolated sides, enabling robust signal integrity in high-noise battery management and traction inverter control loops.
For engineers reviewing the SI8635BT-AS2 datasheet, SI8635BT-AS2 pinout, SI8635BT-AS2 application, or SI8635BT-AS2 equivalent, this page delivers verified timing specs (8 ns typical propagation delay), CMTI (100 kV/µs), power consumption (9.3 mA per side at 100 Mbps), and fail-safe behavior during VDD loss - all critical for ISO 26262-compliant automotive subsystem design.
Technical Context
The SI8635BT-AS2 implements RF-based on/off keying across a silicon-dielectric isolation barrier, eliminating startup initialization and delivering deterministic timing without PLL lock time. Its architecture provides inherent immunity to magnetic fields and eliminates LED aging concerns of optocouplers.
All three channels are unidirectional from VDD1-side inputs to VDD2-side outputs, with no enable pins (EN1/EN2 = NC per Si8635 family spec). The device features Schmitt-trigger inputs (1.23–1.67 V thresholds), 50 Ω nominal output impedance, and failsafe operation where outputs default to logic low when VDD1 is unpowered and VDD2 remains active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports CAN FD, SPI, and isolated ADC interface clocking without oversampling or retiming. |
| Propagation Delay | 8 ns typical - enables sub-20 ns round-trip latency in closed-loop motor control feedback paths. |
| Isolation Rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, qualifying for functional safety isolation in 800 V EV battery systems. |
| CMTI | 100 kV/µs - prevents false triggering during fast-switching events in SiC/GaN inverter gate drive circuits. |
| Supply Voltage Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| Fail-Safe Default | Low - ensures safe shutdown state (e.g., disable gate driver) when primary-side power fails in BMS monitoring chains. |
| Operating Temperature | –40 to +125 °C - meets AEC-Q100 Grade 0 requirements for under-hood and traction inverter placement. |
Pinout & Package
SI8635BT-AS2 is housed in a RoHS-compliant wide-body SOIC-16 package (7.5 mm creepage/clearance), supporting reinforced insulation up to 5 kVRMS. Pin assignments follow standard Si863x layout with dedicated VDD1/GND1 and VDD2/GND2 pairs for galvanic separation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | VDD1, GND1, IN1 | Input-side power domain: VDD1 powers transmitter circuitry; IN1 accepts 2.5–5.5 V logic signals with Schmitt trigger hysteresis. |
| 4, 5, 6 | IN2, IN3, GND1 | Additional input channels - all three inputs share same VDD1/GND1 reference; no internal pull-ups/pull-downs unless fail-safe enabled. |
| 7–8 | NC, NC | No-connect pins - not internally bonded; must be left floating or tied to GND per layout guidelines to minimize noise coupling. |
| 9–10 | VDD2, GND2 | Output-side power domain: VDD2 powers receiver and output drivers; isolated from VDD1 by dielectric barrier. |
| 11–13 | OUT1, OUT2, OUT3 | Isolated CMOS outputs - 50 Ω impedance, 4 mA drive strength, default-low during VDD1 loss, compatible with 3.3 V/5 V logic families. |
| 14–16 | GND2, NC, NC | Second GND2 connection improves return path integrity; NC pins provide mechanical stability and thermal relief in wide-body package. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED degradation and temperature drift issues of optocouplers; enables 60-year lifetime at rated working voltage. |
| Selectably fail-safe output | Factory-configured low-default state ensures predictable deactivation of downstream gate drivers or fault latches during input-side brownout. |
| 100 kV/µs CMTI | Withstands rapid common-mode transients in 800 V traction inverters without data corruption or output glitches. |
| 8 ns propagation delay | Supports real-time current sensing loops with <20 ns total loop latency, critical for overcurrent protection in SiC-based motor drives. |
| AEC-Q100 qualified | Automotive-grade process flow, PPAP documentation, IMDS/CAMDS compliance - validated for safety-critical EV subsystems. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
Use Scenario: Isolating cell voltage monitor ICs (e.g., LTC6813) from MCU in 96S Li-ion packs with 800 V bus potential. IC Role / Device Role / Timing Role: Transmits precision ADC readings across isolation barrier while rejecting switching noise from adjacent DC-DC converters. Use Value: 100 kV/µs CMTI prevents misreads during fast dv/dt events; 8 ns delay preserves sampling synchronization across 100+ cells. |
Use Scenario: Transmitting PWM signals from inverter MCU to isolated gate drivers in 800 V SiC half-bridge modules. IC Role / Device Role / Timing Role: Delivers timing-critical gate enable/disable commands with deterministic latency and fail-safe low default. Use Value: Fail-safe low state disables gate drivers during MCU power loss, preventing shoot-through; 150 Mbps supports multi-level modulation schemes. |
| On-Board Charger (OBC) | Charging Station Communication |
Use Scenario: Isolating bidirectional AC/DC controller signals between primary-side PFC stage and secondary-side LLC resonant converter. IC Role / Device Role / Timing Role: Carries phase-shift control and current sense feedback across 4 kV reinforced barrier in compact OBC designs. Use Value: Wide 2.5–5.5 V supply range interfaces directly with both 3.3 V DSPs and 5 V analog comparators; 5 kVRMS rating meets IEC 62109. |
Use Scenario: Isolating CAN FD communication lines between charging station controller and vehicle battery management unit. IC Role / Device Role / Timing Role: Provides galvanic separation for CAN_H/CAN_L signals while maintaining >1 Mbps bit timing accuracy. Use Value: 150 Mbps headroom accommodates future protocol upgrades; AEC-Q100 qualification ensures reliability in outdoor deployment environments. |
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-16, but default output state is low (no "T" suffix); lacks VDE 0884-10 reinforced certification. | Acceptable for industrial BMS or inverters where VDE 0884-10 is not mandated; lower cost where 10 kV surge immunity is unnecessary. | Choose SI8635BD-AS only if system-level safety certification does not require VDE 0884-10 compliance. |
| ISO7731FDWR | TI's 3-channel isolator with 5000 VRMS, 100 Mbps max, 11 ns propagation delay, and 85 kV/µs CMTI; SOIC-16 narrow body. | Suitable for space-constrained industrial PLCs but not AEC-Q100 qualified; lacks automotive PPAP/IMDS support. | Prefer ISO7731FDWR for non-automotive cost-sensitive designs needing TI ecosystem compatibility. |
Compared with SI8635BD-AS and ISO7731FDWR, SI8635BT-AS2 uniquely combines VDE 0884-10 reinforcement, AEC-Q100 Grade 0 qualification, and 100 kV/µs CMTI - making it the only option qualified for ASIL-D-relevant functions in 800 V electric vehicle powertrains.
Availability
SI8635BT-AS2 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and on-board chargers requiring stable component supply across automotive production lifecycles.
Supply support for SI8635BT-AS2 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 ultra-low power, precise timing, and reinforced safety certification - targeting next-generation EV power electronics and industrial automation.
FAQ
What is the isolation rating and safety certification status of SI8635BT-AS2?
SI8635BT-AS2 provides 5 kVRMS reinforced isolation and is certified to UL 1577, CSA Component Notice 5A, VDE 0884-10 (reinforced), IEC 60950-1, IEC 60601-1, and CQC GB4943.1. These certifications validate its use in safety-critical automotive applications including battery management and traction inverters where reinforced insulation is mandatory.
Does SI8635BT-AS2 support fail-safe operation, and how is it configured?
Yes, SI8635BT-AS2 is factory-configured with fail-safe low-default output behavior. When VDD1 is unpowered and VDD2 remains active, all three outputs (OUT1–OUT3) drive logic low within 12 ns. This behavior is fixed by the "T" in the part number and cannot be changed via external pins or configuration registers.
What are the supply voltage requirements for SI8635BT-AS2 on each side of the isolation barrier?
SI8635BT-AS2 supports independent 2.5–5.5 V supplies on both sides: VDD1 powers the input-side transmitter circuitry, and VDD2 powers the output-side receiver and drivers. Each side requires its own 0.1 µF bypass capacitor placed near the respective VDD/GND pins to ensure stable operation at 150 Mbps.
How does SI8635BT-AS2 achieve its 100 kV/µs common-mode transient immunity?
SI8635BT-AS2 achieves 100 kV/µs CMTI through its RF-based modulation architecture and optimized dielectric barrier design. Unlike capacitive or transformer-based isolators, its on/off keying scheme inherently rejects fast common-mode edges, enabling reliable operation in high-dv/dt SiC/GaN inverter environments without external filtering.
Is SI8635BT-AS2 pin-compatible with other Si863x variants such as SI8635BB-AS or SI8635BD-AS?
Yes, SI8635BT-AS2 shares identical pinout and SOIC-16 wide-body package with all Si8635x variants including SI8635BB-AS and SI8635BD-AS. However, differences in isolation rating (2.5/3.75/5 kVRMS), fail-safe default (low/high), and VDE 0884-10 certification mean PCB layout is interchangeable but system-level safety validation must be repeated for each variant.
SI8635BT-AS2 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:
- Magnetic 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):
- 35kV/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-AS2 FAQ
1.How can I place an order for SI8635BT-AS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8635BT-AS2 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-AS2 reliable?
The price and inventory of SI8635BT-AS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8635BT-AS2 is usually 5 days.
3.What payment methods are accepted for SI8635BT-AS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8635BT-AS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8635BT-AS2?
SI8635BT-AS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8635BT-AS2 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-AS2?
For technical support, including SI8635BT-AS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8635BT-AS2 requirements.
6.How does Aetrix verify that SI8635BT-AS2 is sourced from the original manufacturer or authorized distributors?
All SI8635BT-AS2 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-AS2 meets industry standards.
7.What is the process for return or replacement of SI8635BT-AS2?
All SI8635BT-AS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8635BT-AS2, 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-AS2 part is unused and in its original packaging.
Return procedure for SI8635BT-AS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8635BT-AS2 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
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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