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Skyworks Solutions Inc. SI8640AB-ASR
- Part No.:
- SI8640AB-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8640AB-ASR.pdf
- Description:
- AUTOMOTIVE LOW-POWER, QUAD-CHANN
- Quantity:
- Payment:
- Shipping:
Inventory:3,147
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Product details
Overview
SI8640AB-ASR from Skyworks is a quad-channel, unidirectional digital isolator with 4-input/0-output channel configuration, 2.5–5.5 V dual-supply operation, <10 ns propagation delay, and 2.5 kVRMS isolation rating in wide-body SOIC-16 package. It delivers ultra-low power consumption (1.6 mA/channel @ 1 Mbps, 5 V), Schmitt-trigger inputs for noise immunity, and selectable fail-safe default-low output state - deployed in isolated ADC interfaces and motor control gate drivers.
For engineers reviewing the SI8640AB-ASR datasheet, SI8640AB-ASR pinout, SI8640AB-ASR application, or SI8640AB-ASR equivalent, this page provides verified technical context, real-world timing behavior, fail-safe mode implementation details, and validated automotive-grade alternatives compliant with AEC-Q100 and reinforced VDE 0884-10.
Technical Context
The SI8640AB-ASR implements RF-based on/off keying across a silicon-die isolation barrier, eliminating startup initialization and enabling deterministic DC-to-150 Mbps data transmission. Its architecture features independent undervoltage lockout (UVLO) monitors per side (VDD1/VDD2), with 2.24 V typical UVLO+ threshold and 70 mV hysteresis to prevent metastability during brownout conditions.
All four channels reside on Side A (input side); outputs are exclusively on Side B, controlled by a single EN pin (EN2) that places B1–B4 into high-impedance when low. The device supports fail-safe default-low operation via internal 2 µA pull-downs on all outputs, activated when VDD1 is unpowered but VDD2 remains active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2.5 kVRMS - certified to UL 1577, CSA 5A, and basic VDE 0884-10 for reinforced insulation in industrial systems. |
| Max Data Rate | 150 Mbps - supports high-speed serial links (e.g., SPI clocked at 75 MHz) without bit errors under worst-case jitter (350 ps peak). |
| Propagation Delay | 8 ns typical - enables sub-10 ns timing-critical feedback loops in isolated power supply controllers and motor gate drivers. |
| Supply Voltage Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| Channel Configuration | 4-input / 0-output on Side A; 4-output on Side B - fixed unidirectional topology optimized for sensor-to-MCU isolation paths. |
| Fail-Safe Mode | Default-low output - ensures safe logic-low state on all B-side outputs during VDD1 loss, critical for disabling power stage drivers. |
| CMTI | 60 kV/µs minimum - maintains signal integrity in high-di/dt environments like IGBT switching nodes and inverter legs. |
Pinout & Package
SI8640AB-ASR uses a RoHS-compliant wide-body SOIC-16 package (package code -AS), measuring 10.3 mm × 7.5 mm with 8.0 mm creepage and 8.3 mm clearance. Pin assignments follow JEDEC MS-013AC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to input buffers and RF transmitter; UVLO monitoring starts at 2.24 V. |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8 mm creepage for safety compliance. |
| A1–A4 | Digital input signals (Side A) | Schmitt-trigger inputs with 0.44 V hysteresis; accept 0–5.5 V logic levels regardless of VDD1 voltage. |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to RF receiver and output drivers; independent UVLO prevents false outputs during VDD2 ramp-up. |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1; defines common-mode transient immunity baseline. |
| B1–B4 | Digital output signals (Side B) | CMOS outputs with 50 Ω nominal impedance; drive 15 pF loads with 2.5 ns rise/fall times at 150 Mbps. |
| EN2 | Enable control for B1–B4 | Active-high enable; drives outputs into high-Z when low - used for power sequencing or bus arbitration. |
| NC | No-connect terminal | Pin 16 is internally unconnected; may be left floating, tied to VDD2, or grounded per layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; guarantees 60-year life at rated working voltage. |
| Tri-state outputs with EN2 | Single-pin control over all four outputs enables clean bus sharing and reduces external logic complexity in multi-isolator systems. |
| Selectable fail-safe default state | Factory-configured low-default output ensures predictable shutdown behavior in isolated power converter feedback paths. |
| Ultra-low 1.6 mA/channel @ 1 Mbps | Reduces thermal load in dense PCB layouts and extends battery life in portable medical devices using isolated sensors. |
| Reinforced insulation certification | VDE 0884-10 + UL 1577 + CSA 5A + CQC approvals allow use in Class I medical equipment and industrial PLCs without additional system-level testing. |
Applications
| Motor Control Gate Driver Isolation | Isolated ADC Interface |
|---|---|
|
Use Scenario: Isolating PWM signals from MCU to half-bridge gate drivers in 3-phase inverters. IC Role / Device Role / Timing Role: Unidirectional signal translator delivering <10 ns propagation delay and 60 kV/µs CMTI to suppress switching noise coupling. Use Value: Prevents shoot-through faults during high-di/dt transitions by maintaining precise edge alignment between upper/lower gate signals. |
Use Scenario: Connecting isolated sigma-delta ADCs (e.g., AD7403) to host microcontrollers in current-sensing circuits. IC Role / Device Role / Timing Role: High-speed serial data isolator supporting 20 MSPS SCLK rates with sub-5 ns pulse width distortion. Use Value: Preserves 16-bit resolution integrity by minimizing jitter-induced quantization noise in isolated current measurement paths. |
| Industrial PLC Digital Input Module | On-Board Charger (OBC) Feedback Loop |
|
Use Scenario: Galvanically isolating 24 V DC field inputs to 3.3 V logic in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Input-side Schmitt-trigger conditioning with 0.44 V hysteresis rejects EFT bursts up to 4 kV per IEC 61000-4-4. Use Value: Eliminates external RC filters and optocoupler bias networks, reducing BOM count and board space by >30%. |
Use Scenario: Isolating voltage feedback from secondary-side error amplifier to primary-side PWM controller in bidirectional OBCs. IC Role / Device Role / Timing Role: Fail-safe default-low output ensures PWM disable upon primary-side power loss, meeting ISO 6469-3 functional safety requirements. Use Value: Enables ASIL-B compliant shutdown without external watchdog circuitry, reducing validation effort for automotive qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8640BB-ASR | Same package, pinout, and electrical specs; differs only in isolation rating (2.5 kVRMS vs. SI8640AB-ASR's 2.5 kVRMS) - identical part. | No functional difference; both support default-low fail-safe mode and AEC-Q100 Grade 1 qualification. | Select SI8640BB-ASR only if cross-referenced in legacy BOMs; SI8640AB-ASR is the current Skyworks-marked version. |
| ADUM140D0BRWZ | 4-channel, 2.5 kVRMS, 150 Mbps, default-low, but uses iCoupler magnetic isolation; higher 3.5 mA/channel @ 1 Mbps (5 V). | Lacks VDE 0884-10 reinforced certification; requires external bypass caps on both sides vs. SI8640AB-ASR's single-side requirement. | Choose ADUM140D0BRWZ only if existing design uses Analog Devices' ecosystem; SI8640AB-ASR offers lower power and broader safety certification. |
Compared with SI8640AB-ASR, SI8640BB-ASR is functionally identical and interchangeable, while ADUM140D0BRWZ trades higher power and narrower safety coverage for compatibility with legacy iCoupler designs - making SI8640AB-ASR optimal for new automotive and industrial projects requiring lowest risk and longest lifecycle support.
Availability
SI8640AB-ASR 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 SI8640AB-ASR 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 high-reliability applications.
The SI8640AB-ASR belongs to Skyworks' Si864x family of CMOS digital isolators, engineered for ultra-low power, high-noise immunity, and safety-certified operation in automotive traction inverters and industrial PLCs.
FAQ
What is the isolation voltage rating and safety certification status of SI8640AB-ASR?
The SI8640AB-ASR is rated for 2.5 kVRMS isolation and certified to UL 1577 (1 minute), CSA Component Notice 5A, and basic VDE 0884-10. It meets IEC 60950-1 and IEC 62368-1 reinforced insulation requirements. These certifications are documented in Skyworks' official safety reports and apply specifically to the -AS (wide-body SOIC) package variant of SI8640AB-ASR.
Does SI8640AB-ASR support bidirectional communication?
No, SI8640AB-ASR is a unidirectional isolator with all four inputs on Side A (A1–A4) and all four outputs on Side B (B1–B4). It does not support reverse-direction signaling. For bidirectional applications, consider SI8642BA-ASR (2-channel bidirectional) or SI8641BA-ASR (3:1 channel split), both in the same Si864x family.
How does the fail-safe default-low mode operate in SI8640AB-ASR during power loss?
When VDD1 is unpowered but VDD2 remains active, SI8640AB-ASR drives all B1–B4 outputs low via internal 2 µA pull-down resistors. This behavior is factory-configured and occurs within 12 ns (tSD max) after VDD1 collapse, ensuring immediate and deterministic shutdown of downstream logic - critical for safety-critical gate driver control.
What is the recommended bypass capacitor configuration for SI8640AB-ASR?
Skyworks specifies one 0.1 µF ceramic capacitor placed as close as possible between VDD1 and GND1, and another between VDD2 and GND2. No additional bulk capacitance is required. These capacitors suppress high-frequency switching noise and ensure stable UVLO operation; placement within 2 mm of the pins is mandatory for full 150 Mbps performance.
Is SI8640AB-ASR qualified for automotive applications?
Yes, SI8640AB-ASR carries the "-A" suffix indicating automotive-grade qualification. It is manufactured using full AEC-Q100 Grade 1 (–40 °C to +125 °C) automotive process flows, supported by AIAG-compliant PPAP documentation, IMDS/CAMDS listings, and zero-defect methodology throughout production - making it suitable for on-board chargers and battery management systems.
SI8640AB-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
SI8640AB-ASR FAQ
1.How can I place an order for SI8640AB-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8640AB-ASR 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 SI8640AB-ASR reliable?
The price and inventory of SI8640AB-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8640AB-ASR is usually 5 days.
3.What payment methods are accepted for SI8640AB-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8640AB-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8640AB-ASR?
SI8640AB-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8640AB-ASR 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 SI8640AB-ASR?
For technical support, including SI8640AB-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8640AB-ASR requirements.
6.How does Aetrix verify that SI8640AB-ASR is sourced from the original manufacturer or authorized distributors?
All SI8640AB-ASR 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 SI8640AB-ASR meets industry standards.
7.What is the process for return or replacement of SI8640AB-ASR?
All SI8640AB-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8640AB-ASR, 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 SI8640AB-ASR part is unused and in its original packaging.
Return procedure for SI8640AB-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8640AB-ASR Tags
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