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Skyworks Solutions Inc. SI8635BD-B-IS
- Part No.:
- SI8635BD-B-IS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8635BD-B-IS.pdf
- Description:
- DGTL ISO 5000VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,750
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Product details
Overview
SI8635BD-B-IS from Skyworks is a triple-channel, unidirectional digital isolator with 5 kVRMS reinforced isolation, 150 Mbps data rate, <10 ns propagation delay, and fail-safe low-default output mode-designed for high-noise industrial motor control and isolated power supply feedback loops.
For engineers reviewing the SI8635BD-B-IS datasheet, SI8635BD-B-IS pinout, SI8635BD-B-IS application, or SI8635BD-B-IS equivalent, this page delivers verified electrical specs, SOIC-16 wide-body package details, Schmitt-trigger input noise immunity, and AEC-Q100-qualified automotive-grade alternatives for system-level safety-critical isolation design.
Technical Context
The SI8635BD-B-IS implements RF-based on/off keying across a silicon-dioxide isolation barrier-eliminating startup initialization and enabling robust operation without optical degradation or magnetic coupling limitations. Its architecture supports independent VDD1/VDD2 supplies (2.5–5.5 V) and features integrated undervoltage lockout (UVLO) on both sides.
All three channels are input-side driven (3 inputs on VDD1 side, 0 on VDD2 side), with no enable pins-confirmed by Table 1.1 and Section 3.2 of the datasheet. The device uses Schmitt-trigger inputs (VT+ = 1.67 V typ, VT– = 1.23 V typ) and delivers precise timing: 8 ns typical propagation delay, 0.4 ns typical channel-channel skew, and 5 ns minimum pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation-meets UL 1577, VDE 0884-10, IEC 60950-1, and CQC GB4943.1 for high-voltage system separation. |
| Max Data Rate | 150 Mbps-supports high-speed serial interfaces like SPI, RS-485 transceiver control, and real-time PWM feedback in inverters. |
| Propagation Delay | 8 ns typical (≤13 ns max)-enables tight-timing loop closure in isolated gate drivers and ADC sampling synchronization. |
| Supply Voltage Range | 2.5–5.5 V per side-allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| Fail-Safe Output | Default-low state during VDD1 loss-ensures safe shutdown of downstream power stages when primary-side power fails. |
| Common-Mode Transient Immunity | 50 kV/µs (min)-maintains signal integrity in high-dV/dt environments such as IGBT switching nodes and motor phase legs. |
| Operating Temperature | –40 °C to +125 °C-validated for under-hood automotive and industrial ambient conditions without derating. |
Pinout & Package
SI8635BD-B-IS is housed in a RoHS-compliant 16-pin wide-body SOIC 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, three isolated output channels (B1–B3), and no enable or input pins on the output side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | VDD1, GND1, IN1 | Input-side power (2.5–5.5 V), ground, and first digital input signal-Schmitt-triggered for noise rejection. |
| 4, 5, 6 | IN2, IN3, NC | Second and third input signals; Pin 6 is No Connect-internally unconnected and may be left floating or tied to GND/VDD1. |
| 7, 8, 9, 10 | GND1, VDD1, VDD2, GND2 | Dual-supply domain separation-VDD1/VDD2 must be independently bypassed with 0.1 µF capacitors per side. |
| 11, 12, 13 | B1, B2, B3 | Three isolated output channels-low-default state asserted within 12 ns of VDD1 loss (tSD). |
| 14, 15, 16 | VDD2, GND2, NC | Output-side power and ground; Pin 16 is No Connect-no internal connection, no functional impact. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Silicon-dioxide dielectric enables 60-year lifetime at rated voltage and eliminates LED aging or transformer saturation issues. |
| Sub-10 ns propagation delay | 8 ns typical delay with ≤2.5 ns channel-channel skew-critical for synchronized multi-phase motor control timing. |
| Ultra-low power at 100 Mbps | 13.2 mA per side at 5 V (typ), 9.3 mA at 3.3 V-reduces thermal load in densely packed isolated DC-DC controllers. |
| Schmitt-trigger inputs | 0.44 V hysteresis (VT+ − VT–) rejects >100 mV of common-mode noise on industrial bus lines. |
| Reinforced safety certification | UL, VDE, CSA, CQC approvals-including VDE 0884-10 compliance for 5 kVRMS working voltage in medical and EV systems. |
Applications
| Motor Control Systems | Isolated Switch-Mode Power Supplies |
|---|---|
|
Use Scenario: Isolating gate driver signals in 3-phase inverter stacks for industrial servo drives. IC Role / Device Role / Timing Role: Transmits PWM commands from MCU to isolated gate drivers while blocking 1.5 kV common-mode transients. Use Value: 50 kV/µs CMTI prevents false triggering during IGBT switching; 8 ns delay enables <100 ns dead-time control precision. |
Use Scenario: Providing feedback from secondary-side voltage/current sensors to primary-side controller in isolated DC-DC converters. IC Role / Device Role / Timing Role: Digitally isolates analog-to-digital converter outputs across safety barrier without optocoupler latency or gain drift. Use Value: 150 Mbps rate supports oversampled sigma-delta ADC streams; fail-safe low output disables PWM on primary-side power loss. |
| Industrial Automation PLCs | Battery Management Systems (BMS) |
|
Use Scenario: Isolating digital I/O modules in programmable logic controllers exposed to factory EMI. IC Role / Device Role / Timing Role: Interfaces field-side 24 V digital inputs to 3.3 V logic with galvanic separation and surge protection. Use Value: Wide –40 °C to +125 °C range ensures reliability in uncontrolled cabinet environments; SOIC-16 WB meets IPC-2221 creepage requirements. |
Use Scenario: Transmitting cell voltage monitoring data from high-voltage battery packs to isolated MCU in electric vehicles. IC Role / Device Role / Timing Role: Provides reinforced 5 kVRMS isolation between 400–800 V battery domains and low-voltage control electronics. Use Value: AEC-Q100 qualified variants available; 5 kVRMS rating satisfies ISO 6469-3 for EV battery system functional safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8635BD-B-AS | Automotive-grade variant with AEC-Q100 qualification, PPAP documentation, and IMDS/CAMDS support-identical electrical specs and pinout. | Required for on-board chargers, traction inverters, and BMS where automotive process flow and zero-defect methodology are mandated. | Select SI8635BD-B-AS when automotive qualification, AIAG-compliant PPAP, or material declaration compliance is required. |
| ADUM131D0BRWZ | Analog Devices' 3-channel isolator with 150 Mbps rate, 3.75 kVRMS rating, and 10 ns propagation delay-but lacks fail-safe default-low option and VDE 0884-10 certification. | Suitable for non-safety-critical industrial automation where 3.75 kVRMS suffices and default output state is managed externally. | Choose ADUM131D0BRWZ only if lower isolation rating and absence of certified fail-safe behavior are acceptable in your system architecture. |
Compared with SI8635BD-B-IS, SI8635BD-B-AS adds automotive traceability and process rigor without altering performance, while ADUM131D0BRWZ trades reinforced safety certification and fail-safe control for broader distributor availability and legacy design familiarity.
Availability
SI8635BD-B-IS is available at Aetrix Electronics and suitable for industrial motor control, isolated power supply feedback, and battery management systems requiring stable component supply across extended temperature and high-reliability operating conditions.
Supply support for SI8635BD-B-IS 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 engineered to replace optocouplers and capacitive isolators in high-noise, high-reliability applications-delivering sub-10 ns timing, 5 kVRMS reinforced isolation, and ultra-low power consumption for industrial and automotive systems.
FAQ
What is the isolation rating and safety certification status of SI8635BD-B-IS?
The SI8635BD-B-IS 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 medical, industrial, and automotive systems requiring double or reinforced insulation barriers. SI8635BD-B-IS meets all test conditions specified in these standards at full rated voltage and temperature range.
Does SI8635BD-B-IS support bidirectional communication?
No, SI8635BD-B-IS is a unidirectional isolator with three input channels on the VDD1 side (pins 3, 4, 5) and three corresponding output channels on the VDD2 side (pins 11, 12, 13). It does not support reverse signal flow-data travels exclusively from input to output. For bidirectional isolation, Skyworks offers the Si8631 series, which allocates two channels in one direction and one in the opposite.
What is the default output behavior of SI8635BD-B-IS during input-side power loss?
SI8635BD-B-IS is configured as a default-low device: when VDD1 is unpowered but VDD2 remains active, outputs B1–B3 assert logic low within 12 ns (tSD). This fail-safe behavior ensures downstream circuits-such as gate drivers or enable logic-enter a known safe state during primary-side power interruption, preventing unintended activation in motor or power systems.
Can SI8635BD-B-IS operate with mismatched supply voltages on VDD1 and VDD2?
Yes, SI8635BD-B-IS supports independent VDD1 and VDD2 supplies ranging from 2.5 V to 5.5 V each-allowing combinations such as 3.3 V on the input side and 5 V on the output side, or vice versa. This flexibility eliminates external level-shifting circuitry and simplifies interface design between mixed-voltage subsystems in programmable logic controllers and isolated sensor nodes.
What package type and footprint does SI8635BD-B-IS use?
SI8635BD-B-IS uses a 16-pin wide-body SOIC package (7.5 mm body width) with 1.27 mm pitch, meeting JEDEC MS-013 specifications. This package provides 8.3 mm creepage and 8.3 mm clearance-enabling reinforced 5 kVRMS isolation in compact layouts. Land pattern and solder reflow profiles are documented in Skyworks' Package Outline (page 27) and Land Pattern (page 29) drawings.
SI8635BD-B-IS 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):
- 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:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8635BD-B-IS FAQ
1.How can I place an order for SI8635BD-B-IS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8635BD-B-IS 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 SI8635BD-B-IS reliable?
The price and inventory of SI8635BD-B-IS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8635BD-B-IS is usually 5 days.
3.What payment methods are accepted for SI8635BD-B-IS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8635BD-B-IS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8635BD-B-IS?
SI8635BD-B-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8635BD-B-IS 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 SI8635BD-B-IS?
For technical support, including SI8635BD-B-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8635BD-B-IS requirements.
6.How does Aetrix verify that SI8635BD-B-IS is sourced from the original manufacturer or authorized distributors?
All SI8635BD-B-IS 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 SI8635BD-B-IS meets industry standards.
7.What is the process for return or replacement of SI8635BD-B-IS?
All SI8635BD-B-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8635BD-B-IS, 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 SI8635BD-B-IS part is unused and in its original packaging.
Return procedure for SI8635BD-B-IS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8635BD-B-IS Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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