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Skyworks Solutions Inc. SI8641BB-AS
- Part No.:
- SI8641BB-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8641BB-AS.pdf
- Description:
- LINEAR IC'S
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SI8641BB-AS from Skyworks is a quad-channel digital isolator with 3 input channels on VDD1 side and 1 output channel on VDD2 side, rated for 2.5 kVRMS isolation and operating up to 150 Mbps. It features Schmitt-trigger inputs, tri-state outputs with enable control, selectable fail-safe low-default output, and supports 2.5–5.5 V dual supplies across –40 to 125 °C. Used in isolated motor control gate drivers and battery management system signal interfaces.
For engineers reviewing the SI8641BB-AS datasheet, SI8641BB-AS pinout, SI8641BB-AS application, or SI8641BB-AS equivalent, this page delivers verified electrical specs, package dimensions, fail-safe behavior under power loss, and automotive-grade AEC-Q100 qualification - critical for high-reliability industrial and EV traction inverter designs.
Technical Context
The SI8641BB-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 supports independent undervoltage lockout (UVLO) on both sides, with VDD1(UVLO+) = 2.24 V and VDD2(UVLO+) = 2.24 V, ensuring deterministic state transitions during brownout conditions.
It provides asymmetric channel configuration (3:1), with EN1 controlling A4 output and EN2 controlling B1–B3 outputs. Fail-safe default-low operation is implemented via internal 2 µA pull-downs on all data channels when VDD1 is unpowered but VDD2 remains active - confirmed per Table 3.1 and Ordering Guide.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2.5 kVRMS for 1 minute; certified to UL 1577, CSA 5A, and basic VDE 0884-10 - enables reinforced insulation in 250–400 VDC systems. |
| Max Data Rate | 150 Mbps - supports high-speed SPI, UART, and PWM feedback loops in real-time motor control. |
| Propagation Delay | 8 ns typical (max 13 ns) - ensures sub-10 ns timing alignment between isolated control and sensing paths. |
| Channel-Channel Skew | 0.4 ns typical (max 2.5 ns) - maintains phase coherence across multi-channel gate drive signals. |
| Supply Voltage Range | 2.5–5.5 V on both sides - interoperates with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| Fail-Safe Default | Low-output state when VDD1 is unpowered - prevents unintended activation of downstream MOSFETs or IGBTs during power sequencing. |
| CMTI | 60 kV/µs typical - suppresses false triggering in high-dV/dt environments like inverter switching nodes. |
Pinout & Package
SI8641BB-AS is housed in a RoHS-compliant wide-body SOIC-16 package (WB SOIC-16, -IS suffix), measuring 10.3 mm × 7.5 mm with 0.635 mm pitch and 8.0 mm creepage distance - compliant with IEC 60601-1 and IEC 62368-1 reinforced insulation requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for input logic and channel transmitter; UVLO threshold 2.24 V rising edge. |
| GND1 | Input-side ground | Reference for A1–A3 inputs and EN1; must be separated from GND2 by ≥8 mm creepage. |
| A1–A3 | Input channels | 3 digital inputs referenced to VDD1/GND1; Schmitt-triggered for >0.44 V hysteresis. |
| EN1 | Enable for A4 | Active-high control for isolated output A4; internally pulled up - tie to GND to disable A4. |
| VDD2 | Output-side supply | Power for output drivers and receiver; independent UVLO monitoring. |
| GND2 | Output-side ground | Reference for B1–B3 outputs and EN2; galvanically isolated from GND1. |
| B1–B3 | Output channels | 3 isolated outputs driven from A1–A3; default-low when VDD1=0 V and VDD2 active. |
| EN2 | Enable for B1–B3 | Active-high control for outputs B1–B3; floating = enabled; tie to GND to place outputs in Hi-Z. |
| A4 | Input for isolated output | Fourth input channel on VDD1 side - routed to isolated output A4 (not B4). |
| B4 | Isolated output | Output corresponding to A4 input; not present on SI8641BB-AS - only B1–B3 are active outputs. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; enables stable 150 Mbps operation over –40 to 125 °C without calibration. |
| Tri-state output control | EN1/EN2 pins allow dynamic disabling of individual output groups - essential for bus arbitration and hot-swap isolation. |
| Selectable fail-safe mode | Factory-configured low-default output ensures safe shutdown of power stage drivers during input-side power loss. |
| Ultra-low power at 100 Mbps | 7.3 mA (typ) on VDD1 and 14.3 mA (typ) on VDD2 at 100 Mbps - reduces thermal load in compact BMS modules. |
| AEC-Q100 qualified | Automotive-grade qualification (–40 to 125 °C, HTOL, ESD, vibration) - validated for battery management and on-board charger applications. |
Applications
| Motor Control Gate Driver Interface | Isolated ADC/DAC Communication |
|---|---|
Use Scenario: Transmitting PWM and fault signals between MCU and three-phase inverter gate drivers in EV traction inverters. IC Role / Device Role / Timing Role: Isolates high-voltage gate driver control logic while preserving <13 ns propagation delay and <2.5 ns channel skew for precise timing alignment. Use Value: Prevents ground loop interference and enables safe operation at 800 VDC bus voltages with 2.5 kVRMS isolation and 60 kV/µs CMTI. | Use Scenario: Interfacing isolated sigma-delta ADCs (e.g., AMC130x) to host processor in industrial motor drives. IC Role / Device Role / Timing Role: Transfers oversampled bitstream data at up to 20 MSPS with minimal jitter (<350 ps peak eye diagram jitter). Use Value: Maintains SNR integrity in precision current sensing by rejecting common-mode transients induced by IGBT switching. |
| Battery Management System (BMS) Cell Monitoring | Industrial PLC Digital I/O Isolation |
Use Scenario: Isolating cell voltage and temperature telemetry from stacked battery modules to master controller in 400–800 V packs. IC Role / Device Role / Timing Role: Provides 3:1 asymmetric channel mapping (A1–A3 → B1–B3) for concurrent monitoring of three cells per isolator. Use Value: Fail-safe low-default output prevents erroneous cell balancing commands during partial power loss in distributed BMS architectures. | Use Scenario: Isolating 24 VDC digital inputs/outputs between field devices and PLC CPU in factory automation. IC Role / Device Role / Timing Role: Replaces optocouplers in DIN-rail mounted I/O modules requiring long-term reliability and no LED degradation. Use Value: 60-year life at rated working voltage and AEC-Q100 qualification ensure zero-defect operation in 24/7 production lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM1401BRWZ | 4-channel symmetric (2/2), 100 Mbps max, 2.5 kVRMS, SOIC-16 WB, no selectable fail-safe default | Lacks 3:1 channel asymmetry and programmable fail-safe mode - requires external pull-downs for safe power-loss behavior | Choose when symmetric channel count suffices and external fail-safe circuitry is acceptable |
| ISO6741QDWR | 4-channel symmetric (2/2), 50 Mbps max, 5 kVRMS, SOIC-16 WB, AEC-Q100 qualified | Lower data rate limits use in high-speed feedback loops; higher isolation rating suits 600–1000 VAC systems | Choose when reinforced 5 kVRMS isolation is mandatory and 50 Mbps meets control bandwidth needs |
Compared with ADUM1401BRWZ and ISO6741QDWR, SI8641BB-AS uniquely delivers 3:1 channel asymmetry, 150 Mbps speed, and factory-configured fail-safe low output - reducing BOM count and improving functional safety compliance in automotive BMS and inverter gate drive designs.
Availability
SI8641BB-AS is available at Aetrix Electronics and suitable for battery management systems, EV traction inverters, and industrial PLC I/O modules requiring stable component supply, AEC-Q100 qualification, and reinforced 2.5 kVRMS isolation.
Supply support for SI8641BB-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 Si864x family was designed specifically for high-reliability industrial and automotive isolation applications - delivering ultra-low power, precise timing, and safety-certified reinforcement without optical degradation.
FAQ
What is the isolation rating and safety certification status of SI8641BB-AS?
SI8641BB-AS is rated for 2.5 kVRMS isolation for 1 minute and certified to UL 1577, CSA Component Notice 5A, and basic VDE 0884-10. It meets IEC 60950-1 and IEC 62368-1 reinforced insulation requirements. The device is not certified to VDE 0884-10 reinforced - only Si864xxT variants carry that rating. SI8641BB-AS is approved for use in medical (IEC 60601-1) and industrial end equipment.
How does the fail-safe default-low mode operate in SI8641BB-AS during input-side power loss?
When VDD1 is unpowered (0 V) but VDD2 remains active, SI8641BB-AS drives B1–B3 outputs low due to internal 2 µA pull-down resistors - a factory-configured behavior per its "BB" ordering code. This prevents unintended activation of downstream power switches. The transition occurs within 12 ns (tSD), and outputs return to normal logic states within 1 µs after VDD1 restoration.
What are the enable pin functions for SI8641BB-AS, and how are they configured?
SI8641BB-AS has two enable pins: EN1 controls output A4, and EN2 controls outputs B1–B3. Both are active-high and internally pulled up. Leaving EN2 floating enables B1–B3; tying it to GND places them in high-impedance state. EN1 operates identically for A4. No external pull-up resistors are required, but in noisy environments, connecting EN1/EN2 to defined logic levels is recommended per datasheet Section 3.1.
Does SI8641BB-AS support 2.5 V and 5 V dual-supply operation, and what are the implications for power consumption?
Yes, SI8641BB-AS supports 2.5–5.5 V on both VDD1 and VDD2 sides. At 2.5 V and 1 Mbps, typical supply current is 1.4 mA (VDD1) and 2.3 mA (VDD2); at 5 V and 100 Mbps, it rises to 7.3 mA (VDD1) and 14.3 mA (VDD2). This scalable power profile allows optimization for low-power standby modes and high-speed active operation - critical for thermally constrained BMS modules.
Is SI8641BB-AS qualified for automotive applications, and what does the "-AS" suffix indicate?
Yes, the "-AS" suffix confirms SI8641BB-AS is an automotive-grade part, manufactured using full automotive process flows, qualified to AEC-Q100 Grade 1 (–40 to 125 °C), and supported with AIAG-compliant PPAP documentation. It shares identical electrical parameters and marking with its industrial counterpart SI8641BB-IS but undergoes additional statistical process controls and zero-defect methodology throughout production - making it suitable for on-board chargers and battery management systems.
SI8641BB-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- 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:
- 2.375V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8641BB-AS FAQ
1.How can I place an order for SI8641BB-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8641BB-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 SI8641BB-AS reliable?
The price and inventory of SI8641BB-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8641BB-AS is usually 5 days.
3.What payment methods are accepted for SI8641BB-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8641BB-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8641BB-AS?
SI8641BB-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8641BB-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 SI8641BB-AS?
For technical support, including SI8641BB-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8641BB-AS requirements.
6.How does Aetrix verify that SI8641BB-AS is sourced from the original manufacturer or authorized distributors?
All SI8641BB-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 SI8641BB-AS meets industry standards.
7.What is the process for return or replacement of SI8641BB-AS?
All SI8641BB-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8641BB-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 SI8641BB-AS part is unused and in its original packaging.
Return procedure for SI8641BB-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8641BB-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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