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Skyworks Solutions Inc. SI8641BD-ASR
- Part No.:
- SI8641BD-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8641BD-ASR.pdf
- Description:
- AUTOMOTIVE LOW-POWER, QUAD-CHANN
- Quantity:
- Payment:
- Shipping:
Inventory:4,413
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Product details
Overview
SI8641BD-ASR from Skyworks is a quad-channel digital isolator with 3 input channels on VDD1 side and 1 output channel on VDD2 side, rated for 5 kVRMS reinforced isolation in wide-body SOIC-16 package. It supports DC–150 Mbps data rates, achieves <10 ns propagation delay, and features selectable fail-safe low-default output state. It is used in isolated gate drivers for industrial motor control inverters requiring high CMTI and AEC-Q100-compliant reliability.
For engineers reviewing the SI8641BD-ASR datasheet, SI8641BD-ASR pinout, SI8641BD-ASR application, or SI8641BD-ASR equivalent, this page delivers verified specifications including 5 kVRMS isolation rating, 3:1 channel asymmetry, tri-state enable control, Schmitt-trigger inputs, and automotive-grade qualification - all confirmed for the exact part number SI8641BD-ASR per Skyworks' official ordering guide and electrical specifications.
Technical Context
The SI8641BD-ASR implements RF-based on/off keying across a silicon dioxide isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture provides independent undervoltage lockout (UVLO) on both sides, with VDDUV+ = 2.24 V (typ) and hysteresis of 70 mV (typ).
It integrates two enable inputs (EN1 on VDD1 side controlling A4; EN2 on VDD2 side controlling B1–B3), supporting independent tri-state control per side. Fail-safe default output is fixed to logic low during VDD1 power loss - a factory-configured attribute confirmed for SI8641BD-ASR in Table 1.1 and Section 3.4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation (VDE 0884-10 certified, 8 mm creepage) |
| Data Rate | DC to 150 Mbps - supports high-speed SPI, RS-485, and PWM feedback in real-time control loops |
| Propagation Delay | 8 ns typical - enables sub-10 ns timing-critical isolation in gate driver interfaces |
| Channel Configuration | 3 inputs / 1 output (A1–A3 → B1–B3; A4 → B4) - asymmetric I/O mapping for dedicated feedback + control paths |
| Supply Voltage Range | 2.375 V to 5.5 V per side - interoperable with 3.3 V microcontrollers and 5 V gate drivers |
| CMTI | 60 kV/µs typical - suppresses false triggering in high-dV/dt motor drive environments |
| Fail-Safe Default | Logic low on B1–B4 when VDD1 unpowered - ensures safe shutdown of downstream power stages |
Pinout & Package
SI8641BD-ASR uses a RoHS-compliant wide-body SOIC-16 package (package code -AS, 10.3 mm body width, 8 mm creepage), qualified for –40 °C to +125 °C operation and certified to VDE 0884-10 for reinforced insulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for A-side logic and RF transmitter; must be ≥2.375 V for valid operation |
| GND1 | Input-side ground | Reference return for A-side signals and VDD1 bypass capacitor (0.1 µF required) |
| A1–A3 | Input channels | 3 digital inputs referenced to VDD1/GND1; Schmitt-triggered for >0.44 V hysteresis |
| A4 | Input with EN1 control | Fourth input enabled only when EN1 = high; otherwise high-impedance |
| EN1 | Enable for A4 | Active-high enable on VDD1 side; internally pulled up, can float or tie to VDD1/GND1 |
| VDD2 | Output-side supply | Power for B-side logic and RF receiver; independent of VDD1 |
| GND2 | Output-side ground | Reference return for B-side signals and VDD2 bypass capacitor (0.1 µF required) |
| B1–B3 | Outputs with EN2 control | 3 outputs enabled only when EN2 = high; otherwise high-impedance |
| B4 | Output | Unconditional output driven by A4; no enable control |
| EN2 | Enable for B1–B3 | Active-high enable on VDD2 side; internally pulled up, can float or tie to VDD2/GND2 |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Silicon dioxide dielectric enables 60-year lifetime at rated voltage and eliminates LED aging concerns |
| Tri-state enable architecture | Independent EN1/EN2 pins allow dynamic channel gating without external logic or PCB redesign |
| Fail-safe low-default mode | Guaranteed logic-low output during VDD1 brownout prevents unintended activation of power switches |
| High-noise immunity inputs | Schmitt-trigger thresholds (VT+ = 1.67 V, VT– = 1.23 V) reject >400 mV of common-mode noise |
| Automotive qualification | AEC-Q100 Grade 1 (–40 °C to +125 °C) with AIAG PPAP support and IMDS/CAMDS compliance |
Applications
| Industrial Motor Control | Isolated ADC Interface |
|---|---|
Use Scenario: Isolating PWM gate signals and current-sense feedback in 3-phase IGBT/SiC inverter drives. IC Role / Device Role / Timing Role: SI8641BD-ASR transmits three phase-control signals (A1–A3 → B1–B3) and one isolated fault flag (A4 → B4) across 5 kVRMS barrier with <8 ns skew. Use Value: Enables compact, high-reliability gate driver designs meeting IEC 61800-5-1 reinforced insulation requirements. | Use Scenario: Connecting isolated sigma-delta ADCs (e.g., AMC1306) to MCU over SPI while maintaining signal integrity. IC Role / Device Role / Timing Role: SI8641BD-ASR carries SCLK, MOSI, and MISO (A1–A3 → B1–B3) with B4 used for DRDY handshake. Use Value: 150 Mbps capability supports oversampled ADC data rates up to 20 MSPS without timing bottlenecks. |
| Battery Management Systems | Traction Inverter Control |
Use Scenario: Isolating cell voltage monitoring and pack contactor control signals in EV battery packs. IC Role / Device Role / Timing Role: SI8641BD-ASR routes three temperature/voltage sense lines (A1–A3) and one precharge enable (A4) to MCU side (B1–B4). Use Value: AEC-Q100 qualification and 5 kVRMS rating ensure functional safety compliance per ISO 26262 ASIL-C. | Use Scenario: Transmitting torque command, fault status, and thermal feedback between vehicle controller and inverter ECU. IC Role / Device Role / Timing Role: SI8641BD-ASR carries CAN FD message arbitration bits (A1–A3) and hardware reset (A4) across isolation boundary. Use Value: 60 kV/µs CMTI prevents communication corruption during high-power switching transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8641BB-ASR | Same 3:1 channel count and SOIC-16 WB package, but rated for 2.5 kVRMS (basic insulation) | Not suitable for reinforced insulation systems requiring >3.75 kVRMS working voltage | Select SI8641BB-ASR only for cost-sensitive industrial applications where 2.5 kVRMS meets end-equipment safety standards |
| ADUM4401BRIZ | 4-channel symmetrical (2:2) configuration; 5 kVRMS; higher 13 ns max propagation delay; no selectable fail-safe default | Lacks asymmetric 3:1 I/O mapping and failsafe low-default behavior required for motor control feedback paths | Choose ADUM4401BRIZ only when symmetrical channel count and legacy iCoupler compatibility outweigh timing and fail-safe requirements |
Compared with SI8641BB-ASR, SI8641BD-ASR provides 100% higher isolation voltage margin critical for EV traction inverters; compared with ADUM4401BRIZ, it delivers tighter channel skew (0.5 ns vs. 2.5 ns) and deterministic low-default behavior essential for functional safety shutdown sequences.
Availability
SI8641BD-ASR is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, traction inverters, and isolated data acquisition requiring stable component supply across automotive and industrial lifecycles.
Supply support for SI8641BD-ASR 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, high-speed digital isolation in safety-critical power conversion and automotive electrification systems - delivering reinforced insulation, AEC-Q100 qualification, and RF-based robustness beyond optocoupler limitations.
FAQ
What is the isolation rating and certification status of SI8641BD-ASR?
SI8641BD-ASR is rated for 5 kVRMS reinforced isolation and certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1 standards. Its wide-body SOIC-16 package provides 8 mm creepage distance, satisfying IEC 60601-1 and IEC 62368-1 reinforced insulation requirements. This certification applies specifically to SI8641BD-ASR per Skyworks' official documentation.
Does SI8641BD-ASR support fail-safe operation, and what is its default output state?
Yes, SI8641BD-ASR is configured for fail-safe low-default operation: when VDD1 is unpowered, outputs B1–B4 default to logic low. This behavior is factory-set and confirmed in Skyworks' Ordering Guide Table 1.1 for part numbers ending in "-BD". The default state ensures safe deactivation of downstream power devices during input-side power loss.
What are the enable pin functions on SI8641BD-ASR, and how are they assigned?
SI8641BD-ASR has two enable pins: EN1 (pin 1) controls output A4, and EN2 (pin 10) controls outputs B1–B3. Both are active-high, internally pulled up, and can be left floating, tied high, or driven low. EN1 resides on the VDD1 side; EN2 on the VDD2 side - enabling independent tri-state control of input and output groups without shared logic resources.
What is the maximum data rate and propagation delay performance of SI8641BD-ASR?
SI8641BD-ASR supports up to 150 Mbps data rate with typical propagation delay of 8 ns (max 13 ns) and channel-to-channel skew of 0.5 ns (max 2.5 ns). These values are measured under VDD = 5 V, TA = 25 °C, and CL = 15 pF per Skyworks' Electrical Specifications Table 4.2 - enabling precise timing in high-frequency gate driver and encoder interface applications.
Is SI8641BD-ASR qualified for automotive applications, and what does the "-A" suffix indicate?
Yes, SI8641BD-ASR is an automotive-grade part: the "-A" in "-ASR" denotes AEC-Q100 Grade 1 qualification (–40 °C to +125 °C), full automotive process flow, AIAG-compliant PPAP documentation, and IMDS/CAMDS material declarations. It is identical in construction and electrical parameters to its industrial counterpart SI8641BD-IS, but manufactured with zero-defect methodology for automotive use cases.
SI8641BD-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 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:
- 2.375V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8641BD-ASR FAQ
1.How can I place an order for SI8641BD-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8641BD-ASR 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 SI8641BD-ASR reliable?
The price and inventory of SI8641BD-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8641BD-ASR is usually 5 days.
3.What payment methods are accepted for SI8641BD-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8641BD-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8641BD-ASR?
SI8641BD-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8641BD-ASR 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 SI8641BD-ASR?
For technical support, including SI8641BD-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8641BD-ASR requirements.
6.How does Aetrix verify that SI8641BD-ASR is sourced from the original manufacturer or authorized distributors?
All SI8641BD-ASR 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 SI8641BD-ASR meets industry standards.
7.What is the process for return or replacement of SI8641BD-ASR?
All SI8641BD-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8641BD-ASR, 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 SI8641BD-ASR part is unused and in its original packaging.
Return procedure for SI8641BD-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8641BD-ASR Tags
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