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Skyworks Solutions Inc. SI8641BD-A-IS
- Part No.:
- SI8641BD-A-IS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8641BD-A-IS.pdf
- Description:
- 5 KV 3 FORWARD & 1 REVERSE 4-CHA
- Quantity:
- Payment:
- Shipping:
Inventory:1,569
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Product details
Overview
SI8641BD-A-IS from Skyworks is a quad-channel digital isolator with 3 input channels on VDD1 side and 1 output channel on VDD2 side, 5 kVRMS reinforced isolation rating, 150 Mbps data rate, and selectable low-default fail-safe mode. It operates across –40 to 125 °C and supports 2.5–5.5 V dual supplies, enabling robust signal isolation in high-noise industrial motor control and isolated power supply feedback loops.
For engineers reviewing the SI8641BD-A-IS datasheet, SI8641BD-A-IS pinout, SI8641BD-A-IS application, or SI8641BD-A-IS equivalent, key selection criteria include its 5 kVRMS wide-body SOIC-16 package, tri-state enable control per side, Schmitt-trigger noise immunity, and AEC-Q100 automotive qualification for battery management systems and on-board chargers.
Technical Context
The SI8641BD-A-IS implements RF-based on/off keying across a silicon-die isolation barrier-replacing optocoupler architectures with superior CMTI (≥60 kV/µs), sub-10 ns propagation delay, and no start-up initialization. Its asymmetric channel configuration (3:1) enables bidirectional control signaling in isolated gate drivers and ADC interface designs.
Each side features independent undervoltage lockout (UVLO+ = 2.24 V, UVLO– = 2.16 V), Schmitt-trigger inputs (0.44 V hysteresis), and enable-controlled tri-state outputs. The device maintains stable timing performance (≤2.5 ns channel skew, ≤4.5 ns pulse width distortion) across full temperature and voltage range without calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation (VDE 0884-10 certified), enabling use in mains-connected industrial equipment and EV traction inverters. |
| Data Rate | DC to 150 Mbps - supports high-speed SPI, RS-485 transceiver isolation, and real-time motor encoder feedback. |
| Propagation Delay | 5–13 ns (typ. 8 ns) - ensures tight timing alignment in closed-loop control systems with <100 ns total latency budgets. |
| Supply Voltage | 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 Default | Low-output state during VDD1 loss - prevents unintended activation of downstream MOSFET gates in power supply fault conditions. |
| CMTI | ≥60 kV/µs - rejects fast common-mode transients from IGBT switching in motor drives and inverters without data corruption. |
| Package | WB SOIC-16 (8 mm creepage) - meets reinforced insulation requirements for 600 VAC working voltage applications. |
Pinout & Package
SI8641BD-A-IS uses a 16-pin wide-body SOIC package (package code -IS) with 8 mm creepage distance, RoHS-compliant, JEDEC-standard 260 °C reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 3-channel input side (A1–A3); UVLO threshold 2.24 V ensures reliable startup under brownout. |
| GND1 | Input-side ground reference | Return path for input logic and internal oscillator; must be separated from GND2 by ≥8 mm creepage. |
| A1–A3 | Input signals (VDD1 side) | Schmitt-trigger inputs with 0.44 V hysteresis - reject >1 V noise spikes in noisy factory environments. |
| EN1 | Enable for A4 output | Active-high control for tri-state output A4; internal pull-up allows floating if unused, but external tie recommended in noisy settings. |
| VDD2 | Output-side power supply | Supplies 1-channel output side (B1) and EN2; independent UVLO ensures safe behavior during asymmetric power sequencing. |
| GND2 | Output-side ground reference | Isolated return for B1 and EN2; forms safety barrier between primary and secondary circuits. |
| B1 | Output signal (VDD2 side) | 50 Ω nominal output impedance - matches controlled-impedance PCB traces for clean 150 Mbps signal integrity. |
| EN2 | Enable for B1–B3 outputs | Active-high control for tri-state outputs B1–B3; not used in SI8641BD-A-IS (only B1 present), left unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced 5 kVRMS isolation | Meets VDE 0884-10 and UL 1577 standards - eliminates need for external isolation transformers in Class I medical and industrial safety-critical designs. |
| Asymmetric 3:1 channel configuration | Optimizes PCB layout for control-to-feedback signal routing in isolated DC-DC converters and motor driver gate drive stages. |
| Tri-state enable per side | EN1 controls A4 output; EN2 (unused here) would control B1–B3 - enables dynamic bus sharing and hot-swap capability. |
| Automotive-grade AEC-Q100 qualification | Validated for operation at 125 °C ambient with zero-defect manufacturing flow - suitable for battery management system monitoring in BEVs. |
| Ultra-low power at 100 Mbps | 7.3 mA (VDD1) / 14.3 mA (VDD2) at 100 Mbps - reduces thermal load in densely packed power electronics modules. |
Applications
| Motor Control Feedback Isolation | Isolated ADC Interface |
|---|---|
|
Use Scenario: Isolating position encoder signals and current-sense ADC outputs in servo drives operating at 400 VDC bus voltage. IC Role / Device Role / Timing Role: SI8641BD-A-IS transmits 3-phase current sampling data (A1–A3) and receives PWM enable command (B1) across reinforced barrier. Use Value: 5 kVRMS rating and 60 kV/µs CMTI prevent corruption during IGBT switching; 8 ns typical propagation delay enables <500 ns current loop update times. |
Use Scenario: Connecting isolated sigma-delta ADC (e.g., AD7403) to MCU in industrial PLC analog input modules. IC Role / Device Role / Timing Role: SI8641BD-A-IS carries 3-bit serial data stream (A1–A3) from ADC and returns clock synchronization (B1) across isolation boundary. Use Value: 150 Mbps capability supports 20 MSPS oversampled data streams; low 0.44 V input hysteresis rejects EMI from adjacent 24 V solenoid drivers. |
| On-Board Charger (OBC) Control | Battery Management System (BMS) Monitoring |
|
Use Scenario: Isolating MCU control signals to SiC half-bridge gate drivers and sensing isolated DC-link voltage in EV OBC units. IC Role / Device Role / Timing Role: SI8641BD-A-IS delivers three independent gate enable signals (A1–A3) and receives fault status (B1) from secondary-side protection circuitry. Use Value: AEC-Q100 qualification ensures reliability over 15-year vehicle lifetime; low-default fail-safe prevents shoot-through during VDD1 brownout. |
Use Scenario: Transmitting cell voltage and temperature readings from isolated BMS slave boards to master controller in 800 V battery packs. IC Role / Device Role / Timing Role: SI8641BD-A-IS conveys three cell-group voltage data lines (A1–A3) and receives watchdog reset command (B1) across 5 kVRMS barrier. Use Value: Wide –40 to 125 °C operating range accommodates under-hood thermal cycling; 60-year life at rated voltage ensures long-term insulation integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM4401BRWZ | 4-channel symmetric (2:2), 100 Mbps max, 3.75 kVRMS, SOIC-16 narrow body | Lacks AEC-Q100 qualification and 5 kVRMS rating; unsuitable for automotive OBC or 600 VAC industrial systems | Select when cost-sensitive industrial designs require only basic isolation and lower data rates. |
| ISO6741FDWR | 4-channel symmetric (2:2), 50 Mbps max, 5 kVRMS, SOIC-16 wide body, failsafe default high only | No low-default option; lower speed limits use in high-resolution encoder interfaces or fast ADC links | Choose for TI ecosystem compatibility and where default-high fail-safe aligns with system architecture. |
Compared with ADUM4401BRWZ and ISO6741FDWR, SI8641BD-A-IS uniquely combines automotive qualification, 150 Mbps speed, 5 kVRMS reinforced isolation, and user-selectable low-default fail-safe in a 3:1 asymmetric configuration - making it optimal for next-generation EV power electronics requiring both high bandwidth and functional safety compliance.
Availability
SI8641BD-A-IS is available at Aetrix Electronics and suitable for industrial motor control, EV on-board chargers, and battery management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for SI8641BD-A-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 for communications, automotive, and industrial markets.
The Si864x family was designed specifically for high-reliability signal isolation in harsh electromagnetic environments - targeting applications demanding reinforced safety certification, ultra-low power, and precise timing in automotive and industrial power systems.
FAQ
What is the isolation rating and safety certification of SI8641BD-A-IS?
SI8641BD-A-IS provides 5 kVRMS reinforced isolation and is certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1 standards. It meets IEC 62368-1 and IEC 60601-1 requirements for reinforced insulation, enabling use in medical and industrial equipment with up to 600 VAC working voltage.
Does SI8641BD-A-IS support fail-safe operation during power loss?
Yes, SI8641BD-A-IS is configured as a low-default fail-safe device: when VDD1 is unpowered but VDD2 remains active, output B1 defaults to logic low. This prevents unintended activation of downstream power switches in isolated gate driver applications and is confirmed by its "BD" ordering code.
What are the supply voltage requirements for SI8641BD-A-IS?
SI8641BD-A-IS operates with independent 2.5–5.5 V supplies on both sides (VDD1 and VDD2). Each side has dedicated undervoltage lockout (UVLO+ = 2.24 V) to ensure predictable behavior during brownout conditions, supporting mixed-voltage system interfacing without external regulators.
How does the channel configuration of SI8641BD-A-IS differ from other Si864x variants?
SI8641BD-A-IS has a 3:1 asymmetric channel split - three inputs (A1–A3) on VDD1 side and one output (B1) on VDD2 side. This differs from symmetric variants like SI8642BD-A-IS (2:2) and SI8640BD-A-IS (4:0), optimizing it for control-to-feedback signal routing in isolated power converters and motor drives.
Is SI8641BD-A-IS qualified for automotive applications?
Yes, SI8641BD-A-IS carries the "-A" suffix indicating full AEC-Q100 Grade 0 qualification (–40 to 125 °C), AIAG-compliant PPAP documentation, and automotive-specific manufacturing flow. It is approved for use in battery management systems, on-board chargers, and traction inverter control modules in BEV and HEV platforms.
SI8641BD-A-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:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- -
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- -
- 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-A-IS FAQ
1.How can I place an order for SI8641BD-A-IS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8641BD-A-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 SI8641BD-A-IS reliable?
The price and inventory of SI8641BD-A-IS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8641BD-A-IS is usually 5 days.
3.What payment methods are accepted for SI8641BD-A-IS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8641BD-A-IS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8641BD-A-IS?
SI8641BD-A-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8641BD-A-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 SI8641BD-A-IS?
For technical support, including SI8641BD-A-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8641BD-A-IS requirements.
6.How does Aetrix verify that SI8641BD-A-IS is sourced from the original manufacturer or authorized distributors?
All SI8641BD-A-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 SI8641BD-A-IS meets industry standards.
7.What is the process for return or replacement of SI8641BD-A-IS?
All SI8641BD-A-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8641BD-A-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 SI8641BD-A-IS part is unused and in its original packaging.
Return procedure for SI8641BD-A-IS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8641BD-A-IS 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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