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Skyworks Solutions Inc. SI8641ET-IS2
- Part No.:
- SI8641ET-IS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8641ET-IS2.pdf
- Description:
- LINEAR IC'S
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SI8641ET-IS2 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 (VDE 0884-10), 150 Mbps data rate, and selectable high-default fail-safe mode. It enables robust signal transmission across isolated domains in industrial motor drives and battery management systems.
For engineers reviewing the SI8641ET-IS2 datasheet, SI8641ET-IS2 pinout, SI8641ET-IS2 application, or SI8641ET-IS2 equivalent, this page delivers verified electrical specs, package-validated pin functions, fail-safe behavior under power loss, and direct alternative part comparisons for safety-critical isolation design.
Technical Context
The SI8641ET-IS2 implements RF-based on/off keying across a silicon dioxide isolation barrier, eliminating startup initialization and providing stable timing across –40°C to +125°C. Its architecture supports independent undervoltage lockout (UVLO) on both sides with 70 mV hysteresis and Schmitt-trigger inputs for >50 kV/µs common-mode transient immunity.
It features two enable inputs (EN1 on VDD1 side, EN2 on VDD2 side) enabling independent tri-state control of A4 (EN1) and B1–B3 (EN2). The IS2 package provides 8 mm creepage in standard wide-body SOIC-16 footprint via tie-bar elimination, certified for reinforced insulation per VDE 0884-10 and UL 1577.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced (VDE 0884-10, UL 1577), enabling use in mains-connected industrial equipment and EV battery systems. |
| Data Rate | DC to 150 Mbps - supports high-speed SPI, RS-485, and gate driver feedback loops without external clock conditioning. |
| Propagation Delay | 8 ns typical - ensures sub-10 ns timing alignment critical for synchronous motor control and isolated ADC sampling. |
| Channel Configuration | 3-input / 1-output (A1–A3 → B1–B3, A4 → B4) - matches asymmetric interface needs like isolated MCU-to-inverter communication. |
| Fail-Safe Default | High-output during VDD1 loss - maintains safe logic-high state for enable/disable signals in power-loss scenarios. |
| Supply Range | 2.5–5.5 V on both sides - allows interoperability with 3.3 V microcontrollers and 5 V gate drivers without level shifters. |
| Power @ 100 Mbps | 7.3 mA (VDD1), 14.3 mA (VDD2) - enables low-power operation in thermally constrained battery management modules. |
Pinout & Package
SI8641ET-IS2 uses a RoHS-compliant wide-body SOIC-16 package (IS2 variant) with 8 mm creepage, standard land pattern, and no tie bars - maintaining PCB layout compatibility with IS/IS1 variants while meeting reinforced insulation requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD1) | Input-side supply | Power for A-side logic and RF transmitter; must be bypassed with 0.1 µF capacitor near pin. |
| 2 (GND1) | Input-side ground | Reference for A-side inputs and internal oscillator; separate from GND2 to maintain isolation barrier integrity. |
| 3 (A1) | Input channel 1 | CMOS/Schmitt-trigger input driving isolated channel 1; accepts 2.5–5.5 V logic levels. |
| 4 (A2) | Input channel 2 | CMOS/Schmitt-trigger input driving isolated channel 2; electrically identical to A1. |
| 5 (A3) | Input channel 3 | CMOS/Schmitt-trigger input driving isolated channel 3; shares same UVLO and fail-safe behavior as A1/A2. |
| 6 (EN1) | Enable for A4 output | Active-high control for tri-stating B4; internally pulled up, can be left floating or tied to VDD1/GND1. |
| 7 (A4) | Input channel 4 | CMOS/Schmitt-trigger input driving isolated channel 4 (B4); default-high fail-safe applies here. |
| 8 (GND1) | Input-side ground | Second GND1 connection for improved noise rejection and thermal dissipation. |
| 9 (GND2) | Output-side ground | Reference for B-side outputs and RF receiver; galvanically isolated from GND1. |
| 10 (VDD2) | Output-side supply | Power for B-side logic and output drivers; requires local 0.1 µF bypass capacitor. |
| 11 (B1) | Output channel 1 | 50 Ω nominal output impedance; drives loads directly with controlled-impedance trace termination recommended above 25 MHz. |
| 12 (B2) | Output channel 2 | 50 Ω nominal output impedance; matches B1 timing (≤2.5 ns channel-channel skew) for parallel bus isolation. |
| 13 (B3) | Output channel 3 | 50 Ω nominal output impedance; shares same EN2 control and fail-safe behavior as B1/B2. |
| 14 (EN2) | Enable for B1–B3 outputs | Active-high control for tri-stating B1–B3; internally pulled up, referenced to VDD2. |
| 15 (B4) | Output channel 4 | 50 Ω nominal output impedance; defaults high when VDD1 is unpowered - critical for safe shutdown signaling. |
| 16 (GND2) | Output-side ground | Second GND2 connection supporting low-inductance return paths for all B-side outputs. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Silicon dioxide dielectric enables 60-year lifetime at rated voltage and eliminates LED aging or capacitor drift issues found in optocouplers. |
| Selectable fail-safe default | High-output state during VDD1 loss ensures predictable behavior in power-fail conditions - essential for ISO 26262 ASIL-B/C system monitoring. |
| Independent dual-enable control | EN1 controls only B4; EN2 controls B1–B3 - enables granular output gating for multi-function isolated interfaces. |
| Sub-10 ns propagation delay | 8 ns typical delay with ≤2.5 ns channel-channel skew enables time-critical closed-loop control in servo drives and inverters. |
| VDE 0884-10 reinforced certification | Validated 10 kV surge capability and 5 kVRMS working voltage support reinforced insulation for medical (IEC 60601-1) and industrial (IEC 61800-5-1) applications. |
| Wide supply range (2.5–5.5 V) | Eliminates need for dedicated LDOs when interfacing mixed-voltage subsystems - e.g., 3.3 V MCU to 5 V IGBT gate driver. |
Applications
| Industrial Motor Control | Isolated Power Supply Feedback |
|---|---|
|
Use Scenario: Isolating PWM signals and fault feedback between MCU and three-phase inverter stage in variable-frequency drives. IC Role / Device Role / Timing Role: SI8641ET-IS2 transmits gate drive enable/disable commands (A1–A3 → B1–B3) and receives overcurrent status (A4 → B4) with <8 ns delay and fail-safe high default. Use Value: Prevents shoot-through during brownout by holding gate drivers enabled until confirmed safe shutdown, leveraging high-default B4 output. |
Use Scenario: Providing isolated voltage and current sense feedback from secondary-side SMPS controller to primary-side PWM IC. IC Role / Device Role / Timing Role: SI8641ET-IS2 carries analog-to-digital converter outputs (A1–A3) and digital alarm flag (A4) across isolation barrier with 150 Mbps capability and 5 kVRMS rating. Use Value: Enables fast-loop response in digitally controlled PSUs by supporting high-resolution ADC streaming without latency-induced instability. |
| Battery Management Systems | Medical Isolated Data Acquisition |
|
Use Scenario: Isolating cell voltage monitoring and pack contactor control signals in EV traction battery packs. IC Role / Device Role / Timing Role: SI8641ET-IS2 transmits isolated cell voltage readings (A1–A3) and main contactor enable command (A4 → B4), with B4 defaulting high to keep contactor closed during MCU reset. Use Value: Ensures fail-operational behavior during partial power loss - B4 remains high to maintain pack continuity until explicit disable command. |
Use Scenario: Isolating patient-connected sensor front-end (ECG, EEG) from host processing unit in diagnostic equipment. IC Role / Device Role / Timing Role: SI8641ET-IS2 conveys digitized biopotential data (A1–A3) and electrode disconnect alert (A4) across reinforced barrier compliant with IEC 60601-1 2× MOPP. Use Value: Meets stringent creepage (8 mm) and surge (10 kV) requirements for patient-connected devices while supporting high-sample-rate streaming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8641BB-IS2 | Same 3:1 channel count, 2.5 kVRMS isolation, low-default fail-safe (B4 = low on VDD1 loss). | Used where active-low safety signaling is required - e.g., disabling gate drivers on fault instead of enabling them. | Select SI8641BB-IS2 when system architecture mandates default-low outputs for fail-safe shutdown. |
| ADUM140E0BRIZ | 4-channel, 2.5 kVRMS, 100 Mbps, 12 ns propagation delay, no selectable fail-safe mode (fixed default). | Lacks configurable default state and VDE 0884-10 reinforcement - limited to basic insulation applications. | Choose ADUM140E0BRIZ only for cost-sensitive, non-safety-critical designs where 100 Mbps and fixed defaults suffice. |
Compared with SI8641ET-IS2, SI8641BB-IS2 offers identical packaging and timing but inverted fail-safe behavior, while ADUM140E0BRIZ trades isolation robustness and configurability for lower unit cost in less demanding environments.
Availability
SI8641ET-IS2 is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and medical data acquisition requiring stable component supply, long-term lifecycle assurance, and certified reinforced isolation.
Supply support for SI8641ET-IS2 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, automotive, and medical isolation applications requiring long-life, low-power, and certified reinforced insulation - not general-purpose signal coupling.
FAQ
What is the isolation rating and certification status of SI8641ET-IS2?
SI8641ET-IS2 provides 5 kVRMS reinforced isolation certified to VDE 0884-10 (including 10 kV surge capability), UL 1577, CSA 5A, and IEC 62368-1. The IS2 package achieves 8 mm creepage distance while retaining standard wide-body SOIC-16 dimensions, making it suitable for high-voltage industrial and medical end-equipment requiring two means of protection.
How does the fail-safe default behavior work on SI8641ET-IS2?
SI8641ET-IS2 is configured as a high-default device: when VDD1 is unpowered (e.g., MCU reset or brownout), B4 output remains logic high as long as VDD2 is active. This behavior is factory-set and irreversible - it ensures safety-critical signals like contactor enable remain asserted during upstream power loss, preventing unintended disconnection.
Can SI8641ET-IS2 support 150 Mbps data rates across all four channels simultaneously?
Yes, SI8641ET-IS2 supports DC to 150 Mbps per channel. Electrical specifications confirm full-rate operation with 5 ns minimum pulse width and ≤4.5 ns pulse width distortion. At 150 Mbps, supply current rises to 7.3 mA (VDD1) and 14.3 mA (VDD2), remaining within thermal limits for continuous operation in standard PCB layouts.
What are the enable pin functions for SI8641ET-IS2 and how are they used?
SI8641ET-IS2 has two independent enable inputs: EN1 (pin 6) controls only B4 output; EN2 (pin 14) controls B1–B3 outputs. Both are active-high, internally pulled up, and support tri-state operation. This allows selective channel gating - for example, disabling motor phase signals (B1–B3) while keeping safety monitor (B4) active during diagnostics.
Does SI8641ET-IS2 require external components for reliable operation?
SI8641ET-IS2 requires only two 0.1 µF ceramic bypass capacitors - one between VDD1 and GND1, another between VDD2 and GND2 - placed within 3 mm of their respective pins. No pull-up/down resistors, level shifters, or initialization firmware are needed. Schmitt-trigger inputs and integrated UVLO eliminate external noise filtering or power sequencing circuitry.
SI8641ET-IS2 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:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 60kV/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:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8641ET-IS2 FAQ
1.How can I place an order for SI8641ET-IS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8641ET-IS2 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 SI8641ET-IS2 reliable?
The price and inventory of SI8641ET-IS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8641ET-IS2 is usually 5 days.
3.What payment methods are accepted for SI8641ET-IS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8641ET-IS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8641ET-IS2?
SI8641ET-IS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8641ET-IS2 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 SI8641ET-IS2?
For technical support, including SI8641ET-IS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8641ET-IS2 requirements.
6.How does Aetrix verify that SI8641ET-IS2 is sourced from the original manufacturer or authorized distributors?
All SI8641ET-IS2 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 SI8641ET-IS2 meets industry standards.
7.What is the process for return or replacement of SI8641ET-IS2?
All SI8641ET-IS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8641ET-IS2, 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 SI8641ET-IS2 part is unused and in its original packaging.
Return procedure for SI8641ET-IS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8641ET-IS2 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
-
ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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