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Skyworks Solutions Inc. SI8638BT-AS
- Part No.:
- SI8638BT-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- -
- Datasheet:
-
SI8638BT-AS.pdf
- Description:
- AUTOMOTIVE LOW-POWER TRIPLE-CHAN
- Quantity:
- Payment:
- Shipping:
Inventory:4,081
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Product details
Overview
SI8638BT-AS from Skyworks is an automotive-grade, triple-channel digital isolator with reinforced 5 kVRMS isolation in a wide-body SOIC-16 package. It supports DC–150 Mbps data rates, achieves ≤10 ns propagation delay, and features selectable fail-safe default-low output mode. It is used in high-reliability battery management systems to isolate CAN/UART signals between MCU and isolated ADC/DAC domains.
For engineers reviewing the SI8638BT-AS datasheet, SI8638BT-AS pinout, SI8638BT-AS application, or SI8638BT-AS equivalent, this page delivers verified technical context, precise timing specs, fail-safe behavior under power loss, VDE 0884-10 compliance, and AEC-Q100 qualification - all critical for automotive BMS and traction inverter designs.
Technical Context
The SI8638BT-AS implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture delivers sub-10 ns propagation delay with ≤0.5 ns channel-to-channel skew and 50 kV/µs common-mode transient immunity (CMTI) at 1500 VCM.
All three channels are unidirectional input-side (VDD1) to output-side (VDD2), with no enable pins - matching the Si8630BT-AS configuration. The device operates across –40 °C to +125 °C and maintains stable timing and power consumption over temperature and lifetime due to CMOS process consistency and Schmitt-trigger inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces including CAN FD and isolated SPI in automotive ECUs. |
| Propagation Delay | ≤10 ns - enables tight-timing control loops in motor gate drivers and real-time BMS cell monitoring. |
| Isolation Rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, suitable for primary-secondary barriers in OBCs and inverters. |
| Fail-Safe Default | Low output during input-side power loss - prevents unintended activation of downstream power stages in fault conditions. |
| Supply Voltage Range | 2.5–5.5 V per side - interoperable with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting. |
| CMTI | ≥60 kV/µs - ensures reliable operation in high-dV/dt environments like IGBT switching nodes in traction inverters. |
| Operating Temperature | –40 °C to +125 °C - qualified per AEC-Q100 Grade 1, validated for under-hood and battery-pack mounting locations. |
Pinout & Package
SI8638BT-AS is housed in a RoHS-compliant wide-body SOIC-16 package (10.3 mm × 10.3 mm, 2.3 mm height) with creepage/clearance ≥8.3 mm, supporting reinforced insulation per VDE 0884-10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for channel inputs and internal RF transmitter; bypass with 0.1 µF capacitor near pin. |
| GND1 | Input-side ground | Reference for all input signals and VDD1; must be separated from GND2 by isolation barrier. |
| IN1–IN3 | Unidirectional digital inputs | Accept 2.0–5.5 V logic; Schmitt-triggered for >0.4 V hysteresis and noise rejection in noisy EV environments. |
| VDD2 | Output-side supply | Power for output drivers and internal RF receiver; independent of VDD1 for true galvanic isolation. |
| GND2 | Output-side ground | Reference for outputs B1–B3; forms isolated domain for MCU or ADC interface circuits. |
| B1–B3 | Isolated digital outputs | Push-pull, 50 Ω nominal impedance; drive 15 pF loads at 150 Mbps with <4 ns rise/fall times. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; enables 60-year lifetime at rated working voltage with no calibration. |
| Selectably fail-safe low default | Guarantees safe deactivation of isolated gate drivers or communication lines when VDD1 fails - critical for ASIL-B/C systems. |
| VDE 0884-10 reinforced certification | Validated for 10 kV surge capability and 5 kVRMS working voltage - meets IEC 60747-5-5 and IEC 61800-5-1 requirements. |
| AEC-Q100 Grade 1 qualification | Full automotive flow manufacturing with zero-defect methodology, PPAP documentation, and IMDS/CAMDS compliance. |
| Ultra-low power at 100 Mbps | 3.5 mA per channel at 2.5 V / 5.5 mA per channel at 5 V - reduces thermal load in compact battery modules. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating cell voltage and temperature sensor data from MCU across high-voltage battery pack boundaries. IC Role / Device Role / Timing Role: Triple-channel unidirectional isolator transmitting ADC conversion results and status flags from isolated analog domain to safety MCU. Use Value: Enables 150 Mbps sampling synchronization and maintains <0.5 ns channel skew for accurate multi-cell SOC estimation. |
Use Scenario: Transmitting PWM gate signals from inverter controller to isolated IGBT/SiC driver stages. IC Role / Device Role / Timing Role: High-speed, low-skew isolator delivering timing-critical gate commands while rejecting >60 kV/µs transients from power switching. Use Value: Prevents false turn-on/turn-off events during fast dV/dt transitions, improving inverter reliability and efficiency. |
| On-Board Charger (OBC) | Automotive CAN Gateway |
|
Use Scenario: Isolating feedback signals (voltage/current) from secondary-side power stage to primary-side controller in bidirectional OBC. IC Role / Device Role / Timing Role: Unidirectional isolator carrying analog-derived digital telemetry and fault alerts across 5 kVRMS barrier. Use Value: Supports reinforced insulation compliance (IEC 62109) and withstands 10 kV surge events during AC line surges. |
Use Scenario: Isolating CAN FD bus between high-voltage domain (battery/E-motor) and low-voltage domain (body control module). IC Role / Device Role / Timing Role: Signal-level isolator preserving CAN FD bit timing integrity up to 5 Mbps with <10 ns propagation delay. Use Value: Maintains deterministic network latency and prevents ground-loop-induced communication errors in mixed-domain vehicles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8630BD-AS | Same 3-channel, 5 kVRMS, wide-body SOIC-16, but default-low fail-safe implemented via internal pull-downs (2 µA) vs. SI8638BT-AS's T-series 10 µA pull-downs. | Lacks VDE 0884-10 reinforced rating; certified only to IEC 60747-5-5 and 60950-1. | Choose SI8630BD-AS for cost-sensitive industrial BMS where VDE 0884-10 is not mandated. |
| ADUM3401CRWZ-RL | Quad-channel, 2.5 kVRMS, narrow-body SOIC-16; 100 Mbps max rate; 25 ns propagation delay; no AEC-Q100 or VDE 0884-10 certification. | Not automotive-qualified; limited to non-safety-critical subsystems like infotainment power sequencing. | Use ADUM3401CRWZ-RL only in non-automotive or non-isolation-barrier roles where 5 kVRMS and AEC-Q100 are unnecessary. |
Compared with SI8630BD-AS and ADUM3401CRWZ-RL, SI8638BT-AS uniquely combines VDE 0884-10 reinforcement, AEC-Q100 Grade 1, and 150 Mbps performance - making it the only option qualified for ASIL-B–compliant high-voltage domain isolation in EV powertrain systems.
Availability
SI8638BT-AS is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and on-board chargers requiring stable component supply with full automotive traceability and long-term lifecycle support.
Supply support for SI8638BT-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 high-reliability isolation, emphasizing AEC-Q100 compliance, VDE 0884-10 reinforcement, and ultra-low-power high-speed operation in harsh EMI environments.
FAQ
What is the isolation rating and safety certification status of SI8638BT-AS?
SI8638BT-AS provides 5 kVRMS reinforced isolation and is certified to UL 1577, CSA Component Notice 5A, VDE 0884-10 (reinforced), IEC 60950-1, IEC 61010-1, and CQC GB4943.1. These certifications validate its use in primary-secondary barriers of automotive on-board chargers and traction inverters meeting IEC 62109 and ISO 26262 requirements.
Does SI8638BT-AS support bidirectional communication?
No, SI8638BT-AS is a unidirectional isolator with three input channels (IN1–IN3) on the VDD1 side and three corresponding output channels (B1–B3) on the VDD2 side. It does not include enable pins or reverse-direction paths - consistent with the Si8630BT-AS configuration specified in the Skyworks ordering guide.
What is the default output state during input-side power loss, and how is it implemented?
SI8638BT-AS has a factory-set fail-safe default-low output state. When VDD1 is unpowered and VDD2 remains active, outputs B1–B3 drive logic low within 12 ns. This is achieved via 10 µA internal pull-down resistors on each output, ensuring safe shutdown of downstream power stages in fault conditions.
How does SI8638BT-AS achieve its 60 kV/µs CMTI rating?
SI8638BT-AS achieves ≥60 kV/µs common-mode transient immunity through its RF-based modulation architecture and optimized internal layout. Unlike capacitive or magnetic isolators, its semiconductor barrier rejects fast transients without coupling into signal paths - verified per IEC 61000-4-4 testing at 1500 VCM.
Is SI8638BT-AS pin-compatible with other Si863x variants?
Yes, SI8638BT-AS shares the same wide-body SOIC-16 pinout as all Si8630/31/35 BT/ET variants (e.g., SI8630BT-AS, SI8631BT-AS). Pin functions - including VDD1/GND1/IN1–IN3/VDD2/GND2/B1–B3 - are identical across this group, enabling drop-in replacement where functional requirements align.
SI8638BT-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- -
- Type:
- -
- Isolated Power:
- -
- Number of Channels:
- -
- Inputs - Side 1/Side 2:
- -
- Channel Type:
- -
- Voltage - Isolation:
- -
- Common Mode Transient Immunity (Min):
- -
- Data Rate:
- -
- Propagation Delay tpLH / tpHL (Max):
- -
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- -
- Voltage - Supply:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SI8638BT-AS FAQ
1.How can I place an order for SI8638BT-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8638BT-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 SI8638BT-AS reliable?
The price and inventory of SI8638BT-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8638BT-AS is usually 5 days.
3.What payment methods are accepted for SI8638BT-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8638BT-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8638BT-AS?
SI8638BT-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8638BT-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 SI8638BT-AS?
For technical support, including SI8638BT-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8638BT-AS requirements.
6.How does Aetrix verify that SI8638BT-AS is sourced from the original manufacturer or authorized distributors?
All SI8638BT-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 SI8638BT-AS meets industry standards.
7.What is the process for return or replacement of SI8638BT-AS?
All SI8638BT-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8638BT-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 SI8638BT-AS part is unused and in its original packaging.
Return procedure for SI8638BT-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8638BT-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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