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Skyworks Solutions Inc. SI8641EC-AS1
- Part No.:
- SI8641EC-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8641EC-AS1.pdf
- Description:
- AUTOMOTIVE 3.75 KV 3 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:4,912
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Product details
Overview
SI8641EC-AS1 from Skyworks is a quad-channel digital isolator with 3 input channels on VDD1 side and 1 output channel on VDD2 side, 3.75 kV RMS isolation rating, selectable high-fail-safe default output state, and support for DC–150 Mbps data rates. It operates across –40 to 125 °C and delivers sub-10 ns propagation delay with <0.5 ns channel-channel skew-enabling precise timing in isolated gate drivers and motor control feedback loops.
For engineers reviewing the SI8641EC-AS1 datasheet, SI8641EC-AS1 pinout, SI8641EC-AS1 application, or SI8641EC-AS1 equivalent, key selection criteria include its narrow-body SOIC-16 package, fail-safe high default output, 3.75 kV reinforced insulation (IEC 60950-1/62368-1), and tri-state enable control per side-critical for noise-immune industrial I/O and battery management system signal isolation.
Technical Context
The SI8641EC-AS1 implements RF-based on/off keying across a silicon dioxide isolation barrier, eliminating startup initialization and providing inherent immunity to magnetic fields and EMI. Its architecture supports independent undervoltage lockout (UVLO) on both sides, with VDDUV+ = 2.24 V (typ) and hysteresis of 70 mV (typ).
It features two enable inputs (EN1 on VDD1 side, EN2 on VDD2 side) enabling independent tri-state control of A4 and B1–B3 outputs respectively. Schmitt-trigger inputs ensure >440 mV hysteresis (typ), and output impedance is 50 Ω ±40%-optimized for controlled-impedance PCB routing at high data rates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels / Direction | 4-channel, 3:1 unidirectional (A1–A3 → B1–B3; A4 ← B4) |
| Max Data Rate | 150 Mbps - supports high-speed SPI, RS-485, and PWM feedback in inverters |
| Propagation Delay | 8 ns (typ) - enables sub-10 ns timing-critical gate drive synchronization |
| Isolation Rating | 3.75 kV RMS - certified to IEC 60950-1 & IEC 62368-1 reinforced insulation |
| Supply Voltage Range | 2.5–5.5 V per side - allows mixed-voltage system interfacing (e.g., 3.3 V MCU ↔ 5 V actuator) |
| Fail-Safe Default | High - ensures safe logic-high output during VDD1 loss in BMS or PLC safety circuits |
| CMTI | 60 kV/µs (typ) - maintains signal integrity under fast common-mode transients in motor drives |
Pinout & Package
Narrow-body SOIC-16 package (5.3 mm width), RoHS-compliant, JEDEC MS-012AC, creepage ≥ 5.5 mm, operating temperature –40 to 125 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to input-side logic and channel transmitter; bypass with 0.1 µF capacitor |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by isolation barrier |
| A1–A3 | Input signals (VDD1 side) | 3 digital inputs driving isolated outputs B1–B3; Schmitt-triggered for noise immunity |
| EN1 | Enable for A4 output | Active-high control: when low, A4 enters high-impedance state; internal pull-up to VDD1 |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to output-side logic and receiver; separate bypass required |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1 |
| B1–B3 | Isolated output signals | 3 outputs mirroring A1–A3; fail-safe high during VDD1 loss (per SI8641EC ordering) |
| EN2 | Enable for B1–B3 outputs | Active-high control: when low, B1–B3 enter high-impedance; internal pull-up to VDD2 |
| B4 | Isolated output (A4 direction) | Single output driven by A4; complements 3:1 channel configuration for bidirectional control |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Silicon dioxide dielectric enables 60-year lifetime at rated voltage and eliminates LED aging concerns of optocouplers |
| Tri-state enable per side | EN1 and EN2 allow independent output disable-essential for bus arbitration and hot-swap I/O in PLC backplanes |
| Fail-safe high default | Guarantees logic-high output on B1–B3 when VDD1 fails-required for safe shutdown in battery management systems |
| Low power at 100 Mbps | 7.3 mA (typ) on VDD1 + 14.3 mA (typ) on VDD2 at 100 Mbps - reduces thermal load in dense industrial modules |
| 0.5 ns channel-channel skew | Enables simultaneous sampling of multiple isolated analog signals (e.g., 3-phase current sensing) without timing correction |
Applications
| Industrial Motor Control | Isolated Power Supply Monitoring |
|---|---|
Use Scenario: Isolating PWM gate drive signals and current-sense feedback in 3-phase inverter stacks. IC Role / Device Role / Timing Role: SI8641EC-AS1 provides 3 isolated gate drive channels (A1–A3 → B1–B3) and 1 isolated feedback channel (A4 ← B4), with <0.5 ns skew ensuring synchronized switching. Use Value: Enables precise dead-time control and prevents shoot-through faults in IGBT/SiC modules operating at 20 kHz+ switching frequencies. |
Use Scenario: Monitoring secondary-side voltages/currents in isolated DC-DC converters while maintaining primary-side control loop integrity. IC Role / Device Role / Timing Role: SI8641EC-AS1 transmits analog-to-digital converter outputs across isolation barrier using high-speed serial interface with fail-safe high default. Use Value: Ensures fault signaling remains active (logic high) during primary-side power loss-critical for overvoltage/overcurrent protection activation. |
| Battery Management Systems | Programmable Logic Controller I/O |
Use Scenario: Isolating cell voltage measurement data and pack contactor control signals in EV battery packs. IC Role / Device Role / Timing Role: SI8641EC-AS1 carries 3 cell monitoring signals (A1–A3 → B1–B3) and 1 contactor command (A4 ← B4), with 3.75 kV isolation meeting automotive functional safety requirements. Use Value: Maintains ASIL-B compliance via reinforced insulation and guarantees safe open-contact state (high) during MCU reset or brownout events. |
Use Scenario: Providing isolated digital input conditioning and output drive for field devices in factory automation cabinets. IC Role / Device Role / Timing Role: SI8641EC-AS1 interfaces 24 V DC field sensors to 3.3 V PLC controller, with EN2 enabling software-controlled output disable during diagnostics. Use Value: Eliminates ground-loop interference and supports hot-swap maintenance without interrupting other I/O channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8641BB-AS1 | Same 3:1 channel count and NB SOIC-16 package, but default output state is low (not high) | Requires external pull-up for fail-safe high behavior; unsuitable where hardware-level high-default is mandated | Select SI8641EC-AS1 when fail-safe high is required without external components; choose SI8641BB-AS1 only if system logic accommodates low-default behavior |
| ADUM1401ARWZ | 4-channel, 2:2 direction, 2.5 kV RMS isolation, 100 Mbps max, SOIC-16 WB package | Lacks selectable fail-safe mode; requires external circuitry for default-state control; lower CMTI (25 kV/µs) | Use ADUM1401ARWZ only in non-safety-critical 2:2 isolation roles; SI8641EC-AS1 is preferred for 3.75 kV BMS/motor control with guaranteed high-default |
Compared with SI8641BB-AS1, SI8641EC-AS1 eliminates need for external pull-ups in safety-critical high-default applications; versus ADUM1401ARWZ, it delivers higher isolation rating, faster data rate, superior CMTI, and native fail-safe high-reducing BOM count and validation effort in automotive and industrial designs.
Availability
SI8641EC-AS1 is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, isolated power supply monitoring, and programmable logic controller I/O requiring stable component supply across extended temperature and high-reliability environments.
Supply support for SI8641EC-AS1 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-emphasizing low power, precise timing, reinforced safety certification, and robust operation across –40 to 125 °C.
FAQ
What is the default output state of SI8641EC-AS1 during input-side power loss?
The SI8641EC-AS1 is ordered with "EC" suffix indicating high-fail-safe mode: when VDD1 is unpowered and VDD2 is active, outputs B1–B3 default to logic high. This behavior is hardwired per ordering option and requires no external components-ensuring safe shutdown in battery management or motor control systems where high = disable or fault condition.
Does SI8641EC-AS1 require startup initialization or configuration registers?
No, SI8641EC-AS1 requires no startup initialization or register programming. It begins transmitting valid data within 40 µs (max) after VDD1 and VDD2 rise above UVLO thresholds. The RF modulation architecture operates autonomously-eliminating boot code dependencies and reducing firmware complexity in resource-constrained microcontrollers interfacing with SI8641EC-AS1.
What safety certifications apply to SI8641EC-AS1?
SI8641EC-AS1 carries UL 1577 (5000 VRMS, 1 min), CSA Component Acceptance Notice 5A, VDE 0884-10 (basic insulation), and IEC 60950-1 / IEC 62368-1 (reinforced insulation) certifications. Its 3.75 kV RMS rating meets reinforced insulation requirements for industrial equipment up to 300 V working voltage per IEC 62368-1 Annex D.
How does the enable functionality work on SI8641EC-AS1?
SI8641EC-AS1 has two independent enable inputs: EN1 controls tri-state of A4 output, and EN2 controls tri-state of B1–B3 outputs. Both are active-high with internal pull-ups to their respective VDD rails. When EN1 = low, A4 goes high-impedance; when EN2 = low, B1–B3 go high-impedance-enabling software-controlled isolation disable for diagnostics or power sequencing in systems using SI8641EC-AS1.
Can SI8641EC-AS1 operate with different supply voltages on each side?
Yes, SI8641EC-AS1 supports independent 2.5–5.5 V supplies on VDD1 and VDD2-allowing level translation between 3.3 V microcontrollers and 5 V actuators or sensors. Each side has dedicated UVLO (2.24 V typ) and bypass requirements; cross-side voltage mismatch does not affect isolation integrity or timing performance of SI8641EC-AS1.
SI8641EC-AS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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:
- 3750Vrms
- 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
SI8641EC-AS1 FAQ
1.How can I place an order for SI8641EC-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8641EC-AS1 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 SI8641EC-AS1 reliable?
The price and inventory of SI8641EC-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8641EC-AS1 is usually 5 days.
3.What payment methods are accepted for SI8641EC-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8641EC-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8641EC-AS1?
SI8641EC-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8641EC-AS1 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 SI8641EC-AS1?
For technical support, including SI8641EC-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8641EC-AS1 requirements.
6.How does Aetrix verify that SI8641EC-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8641EC-AS1 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 SI8641EC-AS1 meets industry standards.
7.What is the process for return or replacement of SI8641EC-AS1?
All SI8641EC-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8641EC-AS1, 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 SI8641EC-AS1 part is unused and in its original packaging.
Return procedure for SI8641EC-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8641EC-AS1 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.
-
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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