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Skyworks Solutions Inc. SI8663EC-AS1R
- Part No.:
- SI8663EC-AS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8663EC-AS1R.pdf
- Description:
- AUTOMOTIVE 3.75 KV 3 FORWARD & 3
- Quantity:
- Payment:
- Shipping:
Inventory:3,548
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Product details
Overview
SI8663EC-AS1R from Skyworks is a six-channel digital isolator with 3 input channels on VDD1 side and 3 output channels on VDD2 side, supporting up to 150 Mbps data rate, <10 ns propagation delay, and 3.75 kVRMS isolation rating in a narrow-body SOIC-16 package. It operates from 2.5–5.5 V supplies, features Schmitt-trigger inputs for noise immunity, and implements selectable fail-safe high-default output mode during power loss - used in isolated motor control gate drivers and battery management system signal interfaces.
For engineers reviewing the SI8663EC-AS1R datasheet, SI8663EC-AS1R pinout, SI8663EC-AS1R application, or SI8663EC-AS1R equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in industrial and automotive isolation barriers, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The SI8663EC-AS1R uses RF-based on/off keying across a semiconductor isolation barrier - eliminating startup initialization and enabling robust operation without optical degradation. Its architecture delivers precise timing with ≤0.5 ns channel-to-channel skew and ≤2 ns propagation delay skew across all six channels.
It supports independent undervoltage lockout (UVLO) on both sides (VDD1/VDD2), with UVLO+ = 2.24 V (typ) and hysteresis of 70 mV (typ). The device maintains stable performance from –40 °C to +125 °C and achieves 50 kV/µs common-mode transient immunity (CMTI) at 1500 V common-mode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 6 total: 3 inputs on VDD1 side, 3 outputs on VDD2 side - enables bidirectional signal splitting across isolation boundary. |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like isolated SPI, RS-485 transceivers, and PWM feedback loops. |
| Propagation Delay | 8.0 ns (typ) - ensures tight timing alignment in closed-loop motor control and fast ADC sampling systems. |
| Isolation Rating | 3.75 kVRMS - certified per UL 1577, VDE 0884-10, and IEC 60950-1 reinforced insulation standards. |
| Supply Voltage | 2.5–5.5 V on both sides - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| Fail-Safe Output | Default-high (ordering option "E") - guarantees known logic state during VDD1 loss in safety-critical BMS monitoring paths. |
| CMTI | 50 kV/µs (typ) - prevents false triggering in noisy inverter switching environments with rapid dv/dt transients. |
| Package | Narrow-body SOIC-16 (NB SOIC-16) - footprint-compatible with legacy optocouplers and fits space-constrained PCB layouts. |
Pinout & Package
SI8663EC-AS1R is housed in a RoHS-compliant narrow-body SOIC-16 package (8.9 mm × 3.9 mm, 1.75 mm height) with creepage ≥5.5 mm and clearance ≥5.0 mm - compliant with reinforced insulation requirements for 3.75 kVRMS working voltage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | VDD1-side I/O (inputs) | Pins 1–3: Inputs for VDD1 domain; pins 4–6: Outputs from VDD2 domain - matches 3:3 channel configuration. |
| 7, 14 | GND1, GND2 | Separate ground references for isolated domains - mandatory for maintaining galvanic separation integrity. |
| 8, 9, 10, 11, 12, 13 | VDD2-side I/O (outputs) | Pins 8–10: Outputs driven by VDD1-side inputs; pins 11–13: Inputs to VDD2 domain - confirms 3-input/3-output symmetry. |
| 15, 16 | VDD1, VDD2 | Independent power supplies - enables level-shifting between 2.5 V and 5.5 V domains without external regulators. |
Key Features
| Feature | Design Value |
|---|---|
| No start-up initialization | Operates immediately after VDD exceeds UVLO threshold - eliminates boot-time delays in real-time control systems. |
| Schmitt-trigger inputs | Hysteresis of 0.44 V (typ) - rejects sub-100 ns noise spikes in industrial EMI environments. |
| Ultra-low power at 100 Mbps | 16.4 mA per side (typ) at 5 V - reduces thermal load in densely packed inverters and EV charging modules. |
| Precise channel matching | 0.5 ns channel-to-channel skew (typ) - preserves phase alignment in multi-phase motor current sensing. |
| Automotive qualification | AEC-Q100 Grade 1 (–40 °C to +125 °C) - qualified for on-board chargers and traction inverter auxiliary control. |
| Fail-safe high default | Internal pull-ups on all outputs when VDD1 is unpowered - ensures safe shutdown state in BMS fault detection circuits. |
Applications
| Motor Control Feedback Isolation | Battery Management System Monitoring |
|---|---|
|
Use Scenario: Isolating phase-current sense signals and PWM gate drive returns in 3-phase inverter stacks. IC Role / Device Role / Timing Role: Six-channel isolator providing synchronized, low-skew transmission of three current-sense ADC outputs and three gate driver status signals across isolation barrier. Use Value: Enables simultaneous sampling of all three phases with <0.5 ns inter-channel skew, preserving vector control accuracy under 20 kHz switching. |
Use Scenario: Monitoring cell voltage, temperature, and pack isolation resistance in high-voltage EV battery packs. IC Role / Device Role / Timing Role: Isolating analog monitor IC outputs and MCU command lines while maintaining fail-safe high default during main pack disconnect. Use Value: Default-high outputs ensure open-circuit detection triggers immediate fault response when primary supply fails - meeting ISO 26262 ASIL-B diagnostic coverage. |
| Industrial PLC Digital I/O Modules | Isolated DC-DC Converter Feedback |
|
Use Scenario: Providing isolated digital input/output for field devices in factory automation cabinets with 24 V DC signaling. IC Role / Device Role / Timing Role: Replacing six discrete optocouplers with single SI8663EC-AS1R to reduce board area and improve channel consistency. Use Value: 150 Mbps capability supports high-speed diagnostics and firmware updates over isolated UART/RS-485 links without bandwidth bottleneck. |
Use Scenario: Transmitting error amplifier output and synchronous rectifier timing signals across isolation barrier in flyback or LLC converters. IC Role / Device Role / Timing Role: Delivering tightly timed feedback pulses (<8 ns delay, <2 ns skew) to maintain regulation stability at >500 kHz switching frequencies. Use Value: Sub-10 ns propagation delay minimizes loop latency, enabling faster transient response and improved output voltage regulation ±0.5%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8663BC-AS1 | Same 3:3 channel count and NB SOIC-16 package, but default-low fail-safe mode ('B' suffix vs 'E'). | Used where safety logic requires active-low fault assertion (e.g., emergency stop chains). | Select SI8663BC-AS1 only if system-level fail-safe behavior mandates low-default outputs - not interchangeable without firmware or schematic review. |
| ADUM6633ARWZ | 6-channel, 3:3 configuration, SOIC-16, but higher 10 ns max propagation delay and no AEC-Q100 qualification. | Limited to industrial-grade applications; lacks automotive process flow and PPAP documentation support. | Choose ADUM6633ARWZ only for cost-sensitive non-automotive designs where AEC-Q100 and 50 kV/µs CMTI are not required. |
Compared with SI8663BC-AS1, SI8663EC-AS1R provides guaranteed high-default outputs critical for BMS fault escalation, while versus ADUM6633ARWZ it delivers automotive qualification, tighter timing specs, and higher noise immunity - making it the sole choice for ASIL-B compliant traction inverter subsystems.
Availability
SI8663EC-AS1R is available at Aetrix Electronics and suitable for industrial automation systems, battery management systems, and isolated switch mode supplies requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for SI8663EC-AS1R 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 Si866x family was designed specifically for high-reliability galvanic isolation in harsh industrial and automotive environments - emphasizing ultra-low power, precise timing, and safety-certified reinforced insulation.
FAQ
What is the isolation rating and safety certification status of SI8663EC-AS1R?
SI8663EC-AS1R is rated for 3.75 kVRMS isolation and certified to UL 1577 (1 minute), VDE 0884-10 (reinforced), CSA 5A, and CQC GB4943.1 standards. These certifications validate its suitability for reinforced insulation in industrial and automotive end-equipment requiring functional safety compliance.
Does SI8663EC-AS1R require external components for reliable operation?
Yes - SI8663EC-AS1R requires a 0.1 µF ceramic bypass capacitor placed between each VDD pin (pins 15 and 16) and its respective ground (pins 7 and 14). No pull-up/down resistors are needed, as internal fail-safe circuitry provides defined output states per ordering option.
How does the fail-safe mode function in SI8663EC-AS1R during power loss?
In SI8663EC-AS1R, the "E" suffix denotes default-high fail-safe mode: when VDD1 is unpowered but VDD2 remains active, all six outputs assume and hold a logic-high state. This behavior is implemented via internal pull-ups and is deterministic - critical for fail-operational BMS monitoring paths.
Can SI8663EC-AS1R operate with mixed supply voltages on each side?
Yes - SI8663EC-AS1R supports independent 2.5–5.5 V supplies on VDD1 and VDD2. For example, it can interface a 3.3 V MCU (VDD1) with a 5 V analog front-end (VDD2), enabling seamless level translation without external level shifters or voltage translators.
What is the maximum ambient temperature range supported by SI8663EC-AS1R?
SI8663EC-AS1R is specified for continuous operation from –40 °C to +125 °C ambient temperature. This range is validated per AEC-Q100 Grade 1 requirements and applies across full data rate (up to 150 Mbps) and supply voltage (2.5–5.5 V) ranges.
SI8663EC-AS1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 6
- Inputs - Side 1/Side 2:
- 3/3
- 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
SI8663EC-AS1R FAQ
1.How can I place an order for SI8663EC-AS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8663EC-AS1R 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 SI8663EC-AS1R reliable?
The price and inventory of SI8663EC-AS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8663EC-AS1R is usually 5 days.
3.What payment methods are accepted for SI8663EC-AS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8663EC-AS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8663EC-AS1R?
SI8663EC-AS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8663EC-AS1R 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 SI8663EC-AS1R?
For technical support, including SI8663EC-AS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8663EC-AS1R requirements.
6.How does Aetrix verify that SI8663EC-AS1R is sourced from the original manufacturer or authorized distributors?
All SI8663EC-AS1R 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 SI8663EC-AS1R meets industry standards.
7.What is the process for return or replacement of SI8663EC-AS1R?
All SI8663EC-AS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8663EC-AS1R, 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 SI8663EC-AS1R part is unused and in its original packaging.
Return procedure for SI8663EC-AS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8663EC-AS1R Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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