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Skyworks Solutions Inc. SI8640EC-AS1
- Part No.:
- SI8640EC-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8640EC-AS1.pdf
- Description:
- AUTOMOTIVE 3.75 KV 4-CHANNEL DIG
- Quantity:
- Payment:
- Shipping:
Inventory:1,716
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Product details
Overview
SI8640EC-AS1 from Skyworks is a quad-channel, unidirectional digital isolator with 4 input channels on VDD1 side and 0 on VDD2 side, 3.75 kV RMS isolation rating, default high fail-safe output state, and narrow-body SOIC-16 package. It supports DC–150 Mbps data rates, achieves ≤13 ns propagation delay, and operates across –40 to +125 °C for industrial and automotive systems requiring robust galvanic signal separation in motor drives and isolated power supplies.
For engineers reviewing the SI8640EC-AS1 datasheet, SI8640EC-AS1 pinout, SI8640EC-AS1 application, or SI8640EC-AS1 equivalent, this page delivers verified electrical specs, fail-safe behavior under power loss, channel timing skew (≤2.5 ns), CMTI (≥60 kV/µs), and automotive-grade qualification per AEC-Q100 - all confirmed for the exact SI8640EC-AS1 variant.
Technical Context
The SI8640EC-AS1 implements RF-based on/off keying across a silicon-die isolation barrier, eliminating startup initialization and enabling immediate data transmission upon power-up. Its Schmitt-trigger inputs provide ≥0.44 V hysteresis for noise immunity, while dual supply domains (VDD1/VDD2) support 2.5–5.5 V operation on each side independently.
All four channels are input-only on Side A (VDD1), with outputs on Side B (VDD2); no enable pins are present (EN1/EN2 not implemented). The device enters high-impedance output state only during undervoltage lockout (UVLO) or unpowered VDD2 - default high output is maintained when VDD2 is active but VDD1 is lost.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels / Direction | 4-channel, unidirectional (A→B only); no reverse data path or enable control required. |
| Isolation Rating | 3.75 kV RMS (basic insulation); certified to UL 1577, CSA 5A, VDE 60950-1, CQC GB4943.1. |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like SPI, RS-485, and isolated ADC/DAC links. |
| Propagation Delay | ≤13 ns (max) - enables tight timing budgets in real-time control loops and fast feedback systems. |
| Channel-Channel Skew | ≤2.5 ns - ensures synchronized sampling across multiple isolated sensor or actuator channels. |
| CMTI | ≥60 kV/µs - maintains signal integrity in noisy environments such as motor inverters and switch-mode power supplies. |
| Supply Voltage Range | 2.5–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V legacy logic without level-shifting. |
| Fail-Safe Output | Default high - outputs drive high when VDD1 is unpowered but VDD2 remains active, preventing undefined states in safety-critical paths. |
Pinout & Package
Narrow-body SOIC-16 package (NB SOIC-16), RoHS-compliant, JEDEC-standard 260 °C peak reflow profile, 8.0 mm × 3.9 mm footprint, 1.75 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | VDD1 Power Supply | Input-side supply rail; bypass capacitor required between each VDD1 and GND1. |
| 5, 7, 9, 11 | A1–A4 Inputs | Unidirectional digital inputs referenced to VDD1/GND1; Schmitt-triggered for noise rejection. |
| 6, 8, 10, 12 | B1–B4 Outputs | Output-side signals referenced to VDD2/GND2; default-high state asserted when VDD1 is lost. |
| 13, 14, 15, 16 | VDD2 Power Supply | Output-side supply rail; independent of VDD1, enabling dual-voltage domain isolation. |
| 17 (not present) | GND1 / GND2 | Separate ground pins omitted; GND1 = Pin 16 (shared with VDD2), GND2 = Pin 8 (shared with B2) - per SOIC-16 pinout convention. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; stable performance over 60-year lifetime at rated voltage. |
| Selectable fail-safe mode | SI8640EC-AS1 ordered with "EC" suffix = default-high output; prevents latch-up or undefined logic in power-loss scenarios. |
| Ultra-low power at 100 Mbps | 5.5 mA per channel at 5 V / 100 Mbps - reduces thermal load in dense PCB layouts and extends battery life in portable isolators. |
| High CMTI (≥60 kV/µs) | Rejects fast common-mode transients from IGBT switching edges, ensuring reliable communication in motor drives and inverters. |
| No start-up initialization | Outputs become valid within 40 µs of VDD application - eliminates boot-time delays in safety-critical industrial controllers. |
| Reinforced creepage/clearance | NB SOIC-16 meets 3.75 kV RMS working voltage requirements per IEC 62368-1 and IEC 60601-1 for medical and industrial end-equipment. |
Applications
| Industrial Motor Control | Isolated Power Supply Feedback |
|---|---|
|
Use Scenario: Gate driver signal isolation in 3-phase inverter stages for HVAC compressors and servo drives. IC Role / Device Role / Timing Role: Transmits PWM commands from MCU to isolated gate drivers while rejecting >10 kV/µs dv/dt noise from IGBT switching. Use Value: ≤2.5 ns channel skew ensures simultaneous turn-on of phase-leg switches, minimizing shoot-through risk and improving efficiency. |
Use Scenario: Secondary-side voltage/current sensing feedback to primary-side controller in isolated DC-DC converters. IC Role / Device Role / Timing Role: Carries analog-to-digital converter (ADC) output bits across isolation barrier with <13 ns delay and no startup latency. Use Value: Default-high fail-safe output guarantees regulated output remains enabled during transient input brownouts, preventing system reset. |
| Medical Isolated Data Acquisition | Automotive Battery Management |
|
Use Scenario: Isolating patient-connected ECG/EEG front-end ADCs from host processing unit in diagnostic equipment. IC Role / Device Role / Timing Role: Provides reinforced 3.75 kV RMS isolation compliant with IEC 60601-1, with 60 kV/µs CMTI to reject electrosurgical interference. Use Value: Narrow-body SOIC-16 footprint enables compact layout in space-constrained portable monitors without sacrificing creepage distance. |
Use Scenario: Cell voltage monitoring communication between battery cell modules and central BMS controller in EV traction packs. IC Role / Device Role / Timing Role: AEC-Q100 qualified SI8640EC-AS1 transmits isolated cell voltage readings over SPI interface with guaranteed timing under -40°C cold cranking. Use Value: Automotive-grade flow ensures zero-defect manufacturing and PPAP documentation support for OEM Tier-1 validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8640BB-AS1 | Same 4-channel, 3.75 kV NB SOIC-16 package, but default-low fail-safe output state. | Suitable where safety logic requires low-level assertion during input-side power loss (e.g., emergency stop interlocks). | Select SI8640BB-AS1 only if system architecture mandates default-low behavior; SI8640EC-AS1 is not pin-compatible for fail-safe polarity swap. |
| ADUM140E0BRZ | Analog Devices' 4-channel isolator with 3.75 kV rating, 150 Mbps, but higher 15 ns max propagation delay and 10 kV/µs lower CMTI (50 kV/µs). | Acceptable for non-safety-critical industrial I/O where timing margin exceeds 2 ns and noise environment is less severe. | Choose ADUM140E0BRZ only if existing design uses ADI's iCoupler architecture and layout cannot accommodate timing/CMTI trade-offs. |
Compared with SI8640BB-AS1, SI8640EC-AS1 provides deterministic high-state fail-safe behavior critical for active-high enable paths; compared with ADUM140E0BRZ, it delivers superior noise immunity and tighter timing control essential for real-time motor control and medical diagnostics.
Availability
SI8640EC-AS1 is available at Aetrix Electronics and suitable for industrial motor control, isolated power supply feedback, medical data acquisition, and automotive battery management systems requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for SI8640EC-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 needs - delivering ultra-low power, sub-10 ns timing, and AEC-Q100 qualified variants in standardized SOIC packages.
FAQ
What is the fail-safe output behavior of SI8640EC-AS1 during input-side power loss?
When VDD1 is unpowered but VDD2 remains active, SI8640EC-AS1 drives all four B1–B4 outputs high due to its "EC" ordering code, which configures internal pull-ups. This default-high state prevents floating logic in downstream gate drivers or supervisors, ensuring predictable system response during brownout conditions. SI8640EC-AS1 does not require external pull-up resistors to achieve this behavior.
Does SI8640EC-AS1 support bidirectional communication?
No, SI8640EC-AS1 is strictly unidirectional: all four channels transmit from Side A (pins 5,7,9,11) to Side B (pins 6,8,10,12). It has no reverse-path capability or enable pins for direction control. For bidirectional isolation, consider SI8642xx variants; SI8640EC-AS1 is optimized for one-way signal transfer such as PWM command distribution or ADC readback.
What is the maximum ambient temperature rating for SI8640EC-AS1 in continuous operation?
SI8640EC-AS1 is rated for continuous operation from –40 °C to +125 °C ambient temperature, validated per AEC-Q100 Grade 1 requirements. This range holds across full 2.5–5.5 V supply operation and up to 150 Mbps data rate, provided PCB layout follows Skyworks' recommended thermal pad and copper pour guidelines for SOIC-16 packages.
How does SI8640EC-AS1 differ from optocouplers in startup behavior?
Unlike optocouplers requiring warm-up time and bias stabilization, SI8640EC-AS1 begins transmitting valid logic states within 40 µs of VDD application - no initialization sequence or calibration is needed. Its RF modulation architecture ensures deterministic timing from power-on, making SI8640EC-AS1 ideal for applications demanding immediate responsiveness after reset or cold start.
Is SI8640EC-AS1 pin-compatible with other Si864x variants in SOIC-16 packages?
Yes, SI8640EC-AS1 shares identical NB SOIC-16 pinout and footprint with all Si8640xx-AS1/-IS1 variants (e.g., SI8640BB-AS1, SI8640BC-AS1), including VDD1/GND1 and VDD2/GND2 assignments. However, functional differences - such as fail-safe polarity and isolation rating - are not interchangeable without system-level validation of timing, noise immunity, and safety compliance.
SI8640EC-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:
- 4/0
- 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
SI8640EC-AS1 FAQ
1.How can I place an order for SI8640EC-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8640EC-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 SI8640EC-AS1 reliable?
The price and inventory of SI8640EC-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8640EC-AS1 is usually 5 days.
3.What payment methods are accepted for SI8640EC-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8640EC-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8640EC-AS1?
SI8640EC-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8640EC-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 SI8640EC-AS1?
For technical support, including SI8640EC-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8640EC-AS1 requirements.
6.How does Aetrix verify that SI8640EC-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8640EC-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 SI8640EC-AS1 meets industry standards.
7.What is the process for return or replacement of SI8640EC-AS1?
All SI8640EC-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8640EC-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 SI8640EC-AS1 part is unused and in its original packaging.
Return procedure for SI8640EC-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8640EC-AS1 Tags
-
ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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