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Skyworks Solutions Inc. SI8635BC-AS1
- Part No.:
- SI8635BC-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8635BC-AS1.pdf
- Description:
- AUTOMOTIVE 3.75 KV 3-CHANNEL DIG
- Quantity:
- Payment:
- Shipping:
Inventory:1,402
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Product details
Overview
SI8635BC-AS1 from Skyworks is a triple-channel, automotive-grade digital isolator with 3.75 kVRMS reinforced 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 2.5–5.5 V dual supplies on isolated sides, enabling robust signal integrity in high-noise motor control and battery management systems.
For engineers reviewing the SI8635BC-AS1 datasheet, SI8635BC-AS1 pinout, SI8635BC-AS1 application, or SI8635BC-AS1 equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive qualification (AEC-Q100), exact package mapping (NB SOIC-16), and two rigorously cross-checked alternative part numbers for system-level isolation design.
Technical Context
The SI8635BC-AS1 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering superior noise immunity over optocouplers. Its architecture provides three unidirectional channels (3 inputs on VDD1 side, 0 on VDD2 side), all with Schmitt-trigger inputs and internal 2 µA pull-downs for fail-safe low default behavior.
It features independent undervoltage lockout (UVLO) on both sides (VDDUV+ = 2.24 V typ), 50 Ω nominal output impedance, and CMTI ≥50 kV/µs. The device meets reinforced insulation standards per VDE 0884-10 (for 5 kV variants) and IEC 60747-5-5 / 60950-1 (for 3.75 kV variants like SI8635BC-AS1), with full AEC-Q100 Grade 0 qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 3 unidirectional, input-only on VDD1 side (no enable pins - fixed operation) |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces (e.g., SPI, RS-485 transceiver control) |
| Propagation Delay | 8.0 ns typical - enables tight timing budgets in real-time motor gate drivers |
| Isolation Rating | 3.75 kVRMS - certified per UL 1577, CSA 5A, IEC 60950-1, and CQC GB4943.1 |
| Supply Voltage | 2.5–5.5 V per side - interoperable with 3.3 V microcontrollers and 5 V analog subsystems |
| Operating Temp | –40 to +125 °C - qualified for under-hood automotive use without derating |
| CMTI | ≥50 kV/µs - maintains signal integrity during fast-switching transients in inverters |
Pinout & Package
Narrow-body SOIC-16 (NB SOIC-16), RoHS-compliant, JEDEC MS-012AC, 1.27 mm pitch, 10.3 mm × 7.5 mm footprint, creepage/clearance ≥8.0 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | VDD1 Power Supply | Input-side supply (2.5–5.5 V); bypass capacitor required at each pin |
| 4, 5, 6 | GND1 Ground | Input-side reference; separate from GND2 to maintain isolation barrier |
| 7, 8, 9 | A1, A2, A3 Inputs | Schmitt-triggered digital inputs; 2 µA internal pull-downs for fail-safe low default |
| 10, 11, 12 | B1, B2, B3 Outputs | CMOS outputs (50 Ω typical ZO); drive 15 pF loads at 150 Mbps with <4 ns rise/fall |
| 13, 14, 15 | GND2 Ground | Output-side reference; galvanically isolated from GND1 |
| 16 | VDD2 Power Supply | Output-side supply (2.5–5.5 V); independent of VDD1 for split-domain power architectures |
Key Features
| Feature | Design Value |
|---|---|
| No start-up initialization | RF modulation architecture enables immediate data transmission after power-on - eliminates boot delay in safety-critical systems |
| Selectable fail-safe mode | Low-default output (confirmed by "BC" suffix and Ordering Guide Table 1.1) ensures safe shutdown state during VDD1 loss |
| Ultra-low power at 100 Mbps | 9.3 mA (VDD1) / 12.5 mA (VDD2) typ at 3.3 V - reduces thermal load in dense automotive ECUs |
| Precision timing | 0.4 ns channel-channel skew and 2.0 ns propagation delay skew - preserves phase alignment across 3-channel feedback paths |
| AEC-Q100 Grade 0 | Qualified for –40 to +150 °C junction temperature operation - exceeds standard automotive ambient requirements |
Applications
| Motor Control Feedback Isolation | Battery Management System (BMS) Cell Monitoring |
|---|---|
|
Use Scenario: Isolating PWM gate driver signals and current-sense ADC outputs in 3-phase inverter stacks. IC Role / Device Role / Timing Role: Triple-channel isolator conveying three independent high-side switch control signals with sub-10 ns timing consistency. Use Value: Enables precise dead-time control and synchronized sampling across phases without timing skew-induced shoot-through risk. |
Use Scenario: Transmitting voltage and temperature telemetry from stacked battery cells to a central MCU across isolation barrier. IC Role / Device Role / Timing Role: Unidirectional data isolator carrying 3-cell ADC readings with fail-safe low default during cell-pack brownout. Use Value: Prevents erroneous high-side activation during partial power loss - critical for ISO 26262 ASIL-B compliance. |
| On-Board Charger (OBC) Communication | Traction Inverter Control Interface |
|
Use Scenario: Isolating CAN FD or SPI commands between OBC controller and AC/DC front-end modules. IC Role / Device Role / Timing Role: High-speed digital isolator supporting 150 Mbps burst-mode communication for dynamic power regulation. Use Value: Maintains deterministic latency for real-time grid synchronization while rejecting common-mode noise from EMI-heavy charging circuits. |
Use Scenario: Coupling gate driver enable/disable signals and fault feedback from IGBT/SiC modules to MCU in traction inverters. IC Role / Device Role / Timing Role: Fail-safe isolator ensuring gate drivers enter safe-off state within 12 ns of input power loss (tSD). Use Value: Meets functional safety requirements for rapid fault containment during high-voltage DC-link disturbances. |
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 | 5.0 kVRMS isolation rating; same pinout, timing, and AEC-Q100 qualification | Required where reinforced insulation must withstand higher transient overvoltages (e.g., 800 V DC-link systems) | Choose SI8635BD-AS when system-level safety certification demands >3.75 kV working voltage margin |
| ADUM3301ARWZ | 3.0 kVRMS isolation; 25 Mbps max data rate; non-automotive grade; different pinout (SOIC-16 WB) | Limited to industrial-grade EV auxiliary systems (e.g., HVAC control) without ASIL requirements | Use ADUM3301ARWZ only in cost-sensitive, non-safety-critical designs where 150 Mbps is unnecessary |
Compared with SI8635BC-AS1, SI8635BD-AS offers higher isolation for demanding HV architectures but identical timing and power; ADUM3301ARWZ trades speed, automotive qualification, and isolation for legacy compatibility and lower unit cost in non-safety contexts.
Availability
SI8635BC-AS1 is available at Aetrix Electronics and suitable for automotive battery management systems, traction inverter control interfaces, on-board chargers, and motor control feedback isolation requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for SI8635BC-AS1 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 for high-performance wireless and automotive systems.
The Si863x family was designed specifically for automotive and industrial isolation applications requiring AEC-Q100 qualification, reinforced insulation, and ultra-low-power high-speed data transfer across galvanic barriers.
FAQ
What is the isolation rating and safety certification status of SI8635BC-AS1?
The SI8635BC-AS1 provides 3.75 kVRMS reinforced isolation and is certified to UL 1577 (5000 VRMS/1 min), CSA Component Notice 5A, IEC 60950-1, IEC 60747-5-5, and CQC GB4943.1. It is not VDE 0884-10 certified - that rating applies only to Si863xT variants. SI8635BC-AS1 meets all required standards for automotive BMS and inverter applications per ISO 26262 functional safety frameworks.
Does SI8635BC-AS1 support bidirectional communication or enable control?
No. SI8635BC-AS1 has three unidirectional channels (A1→B1, A2→B2, A3→B3) with no enable pins - its logic table confirms fixed operation (see Table 3.2). Unlike Si8631 or Si8630 variants, the Si8635 series lacks EN1/EN2 inputs. All three outputs follow their respective inputs continuously; there is no tri-state or multiplexing capability in SI8635BC-AS1.
What is the default output state of SI8635BC-AS1 during input-side power loss?
The SI8635BC-AS1 is configured for fail-safe low default output, as indicated by the "BC" ordering code (per Table 1.1: "BC" = Low default, 3.75 kV, NB SOIC-16). When VDD1 is unpowered and VDD2 remains active, outputs B1–B3 drive logic low within 12 ns (tSD), ensuring safe deactivation of downstream drivers or controllers in fault conditions.
How does SI8635BC-AS1 achieve its 150 Mbps data rate without external components?
The SI8635BC-AS1 achieves 150 Mbps using an integrated RF transmitter/receiver architecture with on-chip oscillator and demodulator - eliminating need for external clocks or timing components. Its Schmitt-trigger inputs, 50 Ω output impedance, and optimized internal termination allow direct connection to controlled-impedance PCB traces, reducing BOM count versus optocoupler-based solutions requiring external biasing and amplification.
Is SI8635BC-AS1 pin-compatible with other Si863x variants in narrow-body SOIC-16?
Yes - SI8635BC-AS1 shares identical pinout, footprint, and land pattern with all Si863x narrow-body SOIC-16 variants (e.g., SI8635BB-AS1, SI8635BD-AS1). Pin functions (VDD1, GND1, A1–A3, B1–B3, GND2, VDD2) are consistent across the family. However, isolation rating, default output state, and internal pull-up/pull-down values differ per ordering code and must be verified in system-level validation.
SI8635BC-AS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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:
- 3750Vrms
- 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
SI8635BC-AS1 FAQ
1.How can I place an order for SI8635BC-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8635BC-AS1 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 SI8635BC-AS1 reliable?
The price and inventory of SI8635BC-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8635BC-AS1 is usually 5 days.
3.What payment methods are accepted for SI8635BC-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8635BC-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8635BC-AS1?
SI8635BC-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8635BC-AS1 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 SI8635BC-AS1?
For technical support, including SI8635BC-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8635BC-AS1 requirements.
6.How does Aetrix verify that SI8635BC-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8635BC-AS1 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 SI8635BC-AS1 meets industry standards.
7.What is the process for return or replacement of SI8635BC-AS1?
All SI8635BC-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8635BC-AS1, 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 SI8635BC-AS1 part is unused and in its original packaging.
Return procedure for SI8635BC-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8635BC-AS1 Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
-
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.
-
ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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