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Skyworks Solutions Inc. SI8635BB-AS
- Part No.:
- SI8635BB-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8635BB-AS.pdf
- Description:
- AUTOMOTIVE 2.5 KV 3-CHANNEL DIGI
- Quantity:
- Payment:
- Shipping:
Inventory:1,304
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Product details
Overview
SI8635BB-AS from Skyworks is an automotive-grade triple-channel digital isolator with 2.5 kVRMS reinforced isolation, 150 Mbps data rate, <10 ns propagation delay, and fail-safe default-low output. 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 SI8635BB-AS datasheet, SI8635BB-AS pinout, SI8635BB-AS application, or SI8635BB-AS equivalent, this page delivers verified electrical specs, automotive qualification evidence (AEC-Q100), SOIC-16 wide-body package details, and real-world timing performance including 0.5 ns channel-channel skew and 5 ns minimum pulse width - all critical for safety-critical isolated gate drive and ADC interface designs.
Technical Context
The SI8635BB-AS implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and delivering superior noise immunity versus optocouplers. Its architecture features Schmitt-trigger inputs, independent undervoltage lockout (UVLO) per side (VDDUV+ = 2.24 V typ), and selectable fail-safe mode controlled at ordering.
All three channels are unidirectional from VDD1-side to VDD2-side (3 inputs / 0 inputs), with no enable pins (EN1/EN2 not present per Si8635 family definition). Output impedance is 50 Ω ±40%, requiring controlled-impedance PCB routing for >50 Mbps operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like SPI clocked up to 75 MHz with margin. |
| Propagation Delay | 8.0 ns typical - enables sub-10 ns timing-critical feedback loops in traction inverter gate drivers. |
| Channel-Channel Skew | 0.5 ns max - ensures synchronized sampling across multiple isolated ADC channels. |
| Isolation Rating | 2.5 kVRMS - meets reinforced insulation requirements for functional safety in 400 V battery systems. |
| Supply Voltage Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends. |
| Operating Temperature | –40 to +125 °C - qualified for under-hood automotive environments per AEC-Q100 Grade 0. |
| CMTI | 50 kV/µs min - suppresses false triggering during fast-switching transients in power inverters. |
Pinout & Package
SI8635BB-AS uses a RoHS-compliant 16-pin wide-body SOIC package (7.5 mm creepage/clearance), optimized for reinforced insulation in high-voltage automotive applications. Pin assignments follow standard Si863x layout with dedicated VDD1/GND1 and VDD2/GND2 pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | VDD1, GND1, IN1 | Input-side power domain: VDD1 powers transmitter circuitry; IN1 accepts logic-level signals referenced to GND1. |
| 4, 5, 6 | IN2, IN3, NC | Additional input channels; NC pin is not internally connected and may be left floating or tied to GND/VDD1. |
| 7, 8, 9 | GND1, VDD2, GND2 | Isolated power domain boundary: GND1 and GND2 are galvanically separated; VDD2 powers receiver outputs. |
| 10, 11, 12 | OUT1, OUT2, OUT3 | Output-side logic signals referenced to GND2; default low during VDD1 power loss (fail-safe mode). |
| 13, 14, 15, 16 | NC, NC, NC, NC | No-connect pins - electrically isolated; used for mechanical stability and creepage enhancement in wide-body SOIC. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; enables stable 60-year lifetime at rated voltage. |
| Schmitt-trigger inputs | 0.44 V typical hysteresis - rejects high-frequency noise on long traces in industrial PLC backplanes. |
| Fail-safe default-low output | Guarantees safe shutdown state in BMS monitoring circuits when primary supply fails. |
| AEC-Q100 Grade 0 qualification | Validated for automotive use with zero-defect manufacturing flow and AIAG-compliant PPAP documentation. |
| Ultra-low power at 100 Mbps | 13.2 mA per side typical at 5 V - reduces thermal load in compact OBC modules with multiple isolation channels. |
Applications
| Motor Control Systems | Battery Management Systems |
|---|---|
Use Scenario: Isolating gate driver signals in 400 V traction inverters with SiC MOSFETs switching at 50–100 kHz. IC Role / Device Role / Timing Role: Unidirectional level-shifting isolator transmitting PWM commands from MCU to isolated gate driver ICs. Use Value: 0.5 ns channel skew ensures simultaneous turn-on of phase-leg switches, minimizing shoot-through risk. | Use Scenario: Monitoring cell voltages and temperatures in EV battery packs with isolated ADC interfaces. IC Role / Device Role / Timing Role: Providing reinforced isolation between high-voltage battery stack and low-voltage MCU domain. Use Value: 2.5 kVRMS rating satisfies IEC 61000-4-5 surge immunity requirements for pack-level ESD protection. |
| On-Board Chargers | Traction Inverters |
Use Scenario: Isolating communication lines (e.g., isolated CAN or SPI) between AC/DC and DC/DC sections in bi-directional OBCs. IC Role / Device Role / Timing Role: Enabling reliable data exchange across isolation barrier while maintaining system-level functional safety. Use Value: AEC-Q100 qualification ensures compliance with ISO 26262 ASIL-B requirements for charger control units. | Use Scenario: Transmitting fault signals (e.g., overcurrent, overtemperature) from isolated sensor nodes to central controller. IC Role / Device Role / Timing Role: Fail-safe default-low output guarantees active-low fault assertion remains valid during input-side power loss. Use Value: 50 kV/µs CMTI prevents false fault triggers during 1000 V/µs bus transients in 800 V inverter systems. |
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 vs. 2.5 kVRMS; identical pinout, timing, and power specs. | Required for designs needing reinforced insulation across >600 V working voltage (e.g., 800 V battery systems). | Select SI8635BD-AS when end-equipment certification requires higher creepage/clearance or 5 kV test compliance. |
| ISO7731FDWR | 3-channel, 100 Mbps, 5000 VRMS, SOIC-16 wide body; TI's reinforced isolator with similar AEC-Q100 Grade 0 support. | Lacks 150 Mbps capability and has 12 ns max propagation delay vs. 13 ns for SI8635BB-AS. | Choose ISO7731FDWR only if legacy TI ecosystem integration or specific qualification traceability is mandated. |
Compared with SI8635BD-AS, SI8635BB-AS offers lower isolation voltage but reduced cost and smaller footprint margin for 400 V systems; versus ISO7731FDWR, it delivers 50% higher data rate and tighter timing control essential for next-gen OBC timing loops.
Availability
SI8635BB-AS is available at Aetrix Electronics and suitable for motor control systems, battery management systems, on-board chargers, and traction inverters requiring stable component supply across automotive production lifecycles.
Supply support for SI8635BB-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 automotive and industrial applications demanding high reliability, AEC-Q100 qualification, and reinforced isolation in compact wide-body SOIC packages.
FAQ
What is the isolation rating and certification status of SI8635BB-AS?
SI8635BB-AS provides 2.5 kVRMS reinforced isolation and is certified to UL 1577, CSA Component Acceptance Notice 5A, VDE 0884-10 (reinforced), IEC 60950-1, and CQC GB4943.1. As an automotive-grade part, it also meets AEC-Q100 Grade 0 requirements with full PPAP documentation support.
Does SI8635BB-AS support bidirectional communication?
No, SI8635BB-AS is a unidirectional isolator with three channels flowing exclusively from the VDD1 side (pins 1–6) to the VDD2 side (pins 10–12). The Si8635 family does not include enable pins or reverse-direction channels - unlike Si8631 variants which offer 2:1 directionality.
What is the default output behavior of SI8635BB-AS during input-side power loss?
SI8635BB-AS is ordered with default-low fail-safe mode, meaning outputs OUT1–OUT3 drive logic low when VDD1 is unpowered but VDD2 remains active. This behavior is hardwired per ordering option and ensures safe shutdown in battery monitoring and gate drive applications.
Can SI8635BB-AS operate with mismatched supply voltages on each side?
Yes, SI8635BB-AS supports independent 2.5–5.5 V supplies on VDD1 and VDD2. For example, it can interface a 3.3 V MCU (VDD1) with a 5 V analog front-end (VDD2), enabling flexible voltage domain bridging without external level shifters.
How does the RF isolation architecture of SI8635BB-AS improve reliability over optocouplers?
SI8635BB-AS uses RF modulation instead of LEDs, eliminating wear-out mechanisms like LED degradation and CTR drift. Its semiconductor barrier delivers stable propagation delay (<10 ns), 60-year lifetime at rated voltage, and immunity to ambient light and temperature-induced gain variation - critical for automotive longevity.
SI8635BB-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:
- 2500Vrms
- 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
SI8635BB-AS FAQ
1.How can I place an order for SI8635BB-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8635BB-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 SI8635BB-AS reliable?
The price and inventory of SI8635BB-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8635BB-AS is usually 5 days.
3.What payment methods are accepted for SI8635BB-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8635BB-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8635BB-AS?
SI8635BB-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8635BB-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 SI8635BB-AS?
For technical support, including SI8635BB-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8635BB-AS requirements.
6.How does Aetrix verify that SI8635BB-AS is sourced from the original manufacturer or authorized distributors?
All SI8635BB-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 SI8635BB-AS meets industry standards.
7.What is the process for return or replacement of SI8635BB-AS?
All SI8635BB-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8635BB-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 SI8635BB-AS part is unused and in its original packaging.
Return procedure for SI8635BB-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8635BB-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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