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Skyworks Solutions Inc. SI8640AB-AS1
- Part No.:
- SI8640AB-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8640AB-AS1.pdf
- Description:
- AUTOMOTIVE 2.5 KV 4-CHANNEL DIGI
- Quantity:
- Payment:
- Shipping:
Inventory:3,835
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Product details
Overview
SI8640AB-AS1 from Skyworks is a quad-channel, unidirectional digital isolator with 4 input channels on VDD1 side and 0 on VDD2 side, rated for 2.5 kVRMS isolation, 150 Mbps data rate, and –40 to 125 °C operation. It features Schmitt-trigger inputs, tri-state outputs with single enable control (EN), selectable fail-safe low-default output, and ultra-low power consumption (1.6 mA/channel @ 1 Mbps, 5 V).
For engineers reviewing the SI8640AB-AS1 datasheet, SI8640AB-AS1 pinout, SI8640AB-AS1 application, or SI8640AB-AS1 equivalent, this device serves as a drop-in replacement for optocouplers in isolated gate drivers, industrial PLC I/O modules, and medical sensor interfaces where high CMTI (>60 kV/µs), precise timing (<10 ns propagation delay), and AEC-Q100-compliant reliability are required.
Technical Context
The SI8640AB-AS1 implements RF-based on/off keying across a silicon-dielectric isolation barrier, eliminating startup initialization and enabling robust noise immunity without external components beyond 0.1 µF bypass capacitors. Its architecture supports independent undervoltage lockout (UVLO) on both sides with 70 mV hysteresis and stable timing over temperature.
All four channels are unidirectional (A→B), with a single EN pin on the output (VDD2) side controlling all B outputs simultaneously. The device operates across 2.5–5.5 V supplies on both sides and maintains <2.5 ns channel-to-channel skew and <4.5 ns pulse width distortion at 150 Mbps under load.
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 interfaces like SPI, RS-485 transceiver control, and isolated ADC/DAC clock domains. |
| Propagation Delay | 5–13 ns - ensures tight timing alignment in motor control feedback loops and real-time power converter gate drive signals. |
| Supply Voltage Range | 2.5–5.5 V per side - enables interoperability with 3.3 V microcontrollers and 5 V legacy logic without level shifters. |
| Common-Mode Transient Immunity | 60 kV/µs (typ) - suppresses noise coupling in high-dv/dt environments such as inverters and switch-mode power supplies. |
| Fail-Safe Default | Low-output during VDD1 loss - prevents undefined states in safety-critical shutdown sequences of battery management systems. |
| Power Consumption | 1.6 mA/channel @ 1 Mbps, 5 V - reduces thermal load and extends battery life in portable medical and automotive diagnostics equipment. |
Pinout & Package
SI8640AB-AS1 uses a 16-pin wide-body SOIC package (WB SOIC-16, -AS1 suffix denotes automotive-grade narrow creepage variant), with 8.0 mm creepage and clearance compliant with IEC 60950-1 and IEC 62368-1 reinforced insulation requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for input-side logic and RF transmitter; must be decoupled with 0.1 µF capacitor near pin. |
| GND1 | Input-side ground | Reference for all input signals and VDD1; requires low-inductance connection to minimize ground bounce. |
| INA1–INA4 | Input channels | Four Schmitt-triggered digital inputs accepting 2.0–5.5 V logic; immune to slow-rising edges and EMI. |
| VDD2 | Output-side supply | Power for output-side RF receiver and driver; independent of VDD1 for true galvanic isolation. |
| GND2 | Output-side ground | Reference for output signals; physically separated from GND1 by isolation barrier. |
| EN | Enable control | Active-high signal on VDD2 side; drives all four outputs into high-impedance when low - enables bus sharing and power sequencing. |
| OUTB1–OUTB4 | Output channels | CMOS-compatible outputs with ~50 Ω impedance; support controlled-impedance PCB routing for >50 Mbps signals. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; guarantees 60-year lifetime at rated working voltage. |
| Tri-state outputs with shared EN | Single-pin control enables hot-swap capability and multi-drop bus architectures without external logic gates. |
| Selectable fail-safe default | Factory-configured low-output state ensures safe deactivation of downstream MOSFETs or relays during input power loss. |
| Ultra-low power at high speed | 5.5 mA/channel @ 100 Mbps, 5 V - cuts isolation-related power by >50% vs. legacy isolators in high-data-rate industrial gate drivers. |
| AEC-Q100 qualified | Automotive-grade qualification (-A suffix) confirms robustness for on-board chargers and traction inverter control under extended temperature cycling. |
Applications
| Industrial PLC I/O Module | Isolated Switch-Mode Power Supply |
|---|---|
Use Scenario: Digital input card acquiring 24 V DC field signals from sensors and actuators in factory automation. IC Role / Device Role / Timing Role: Isolates controller-side logic from noisy 24 V field bus while transmitting status bits with <10 ns jitter. Use Value: Enables reliable operation in electrically harsh environments with >60 kV/µs common-mode transients from nearby VFDs. |
Use Scenario: Feedback path in a 3 kW LLC resonant converter using SiC MOSFETs with 100+ kHz switching frequency. IC Role / Device Role / Timing Role: Transmits isolated gate drive enable/disable commands and fault signals between primary and secondary controllers. Use Value: Maintains <2.5 ns channel skew across all four control lines, preserving precise dead-time control critical for ZVS operation. |
| Medical Patient Monitoring System | Automotive Battery Management Unit |
Use Scenario: Isolating analog front-end ADCs and digital processing units in ECG/EEG devices requiring 600 VRMS patient isolation. IC Role / Device Role / Timing Role: Transfers digitized sensor data and control commands across reinforced insulation barrier meeting IEC 60601-1. Use Value: Achieves 2.5 kVRMS rating with WB SOIC-16 footprint - eliminates need for larger creepage packages or custom spacing. |
Use Scenario: Cell voltage monitoring and balancing control in a 400 V EV battery pack with distributed slave controllers. IC Role / Device Role / Timing Role: Isolates CAN communication lines and cell balancing FET gate signals from high-voltage battery domain. Use Value: AEC-Q100 qualification and –40 to 125 °C operation ensure long-term reliability in under-hood thermal cycling conditions. |
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 pinout, package, and specs - differs only in top-side marking and internal test flow; identical electrical performance and AEC-Q100 compliance. | No functional difference; used interchangeably in automotive production where BB suffix is preferred for traceability. | Select SI8640BB-AS1 if sourcing from distributors with higher stock availability of that OPN variant. |
| ADUM140D0BRWZ | 4-channel, 150 Mbps, 2.5 kVRMS, but uses iCoupler magnetic isolation; higher typical supply current (3.5 mA/channel @ 1 Mbps, 3.3 V) and 15 ns max propagation delay. | Lacks AEC-Q100 qualification; not recommended for automotive BMS or OBC designs requiring automotive process flows. | Choose ADUM140D0BRWZ only for cost-sensitive industrial applications where AEC-Q100 is not mandated and layout space allows for larger decoupling. |
Compared with SI8640BB-AS1, SI8640AB-AS1 offers identical functionality but may differ in manufacturing lot traceability; versus ADUM140D0BRWZ, SI8640AB-AS1 delivers lower power, tighter timing, and full automotive qualification - making it superior for safety-critical EV and medical systems.
Availability
SI8640AB-AS1 is available at Aetrix Electronics and suitable for industrial automation systems, medical electronics, and automotive battery management units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SI8640AB-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, high-speed digital isolation in industrial, medical, and automotive systems - replacing optocouplers with CMOS-based RF isolation that delivers superior timing, power, and lifetime performance.
FAQ
What is the isolation voltage rating and safety certification of SI8640AB-AS1?
SI8640AB-AS1 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 reinforced insulation requirements per IEC 60950-1 and IEC 62368-1, making it suitable for industrial and medical applications requiring double protection. The SI8640AB-AS1 does not carry VDE 0884-10 reinforced certification - that applies only to Si864xxT variants.
Does SI8640AB-AS1 support bidirectional data transmission?
No, SI8640AB-AS1 is a unidirectional isolator with four input channels (INA1–INA4) on the VDD1 side and four output channels (OUTB1–OUTB4) on the VDD2 side. It cannot transmit data from VDD2 back to VDD1. For bidirectional isolation, consider SI8642AB-AS1 (2:2 channel split) or SI8641AB-AS1 (3:1 configuration), both available in the same automotive-grade SOIC-16 package.
What is the function of the EN pin on SI8640AB-AS1, and how is it used?
The EN pin on SI8640AB-AS1 is an active-high enable control located on the output (VDD2) side that simultaneously places all four OUTB outputs into high-impedance state when driven low. This enables bus sharing, power sequencing, and hot-swap capability. When left floating or tied high, outputs follow input states. SI8640AB-AS1 has no EN2 pin - unlike SI8641/SI8642 variants - because all channels are input-only on Side A.
How does the fail-safe default output behavior work on SI8640AB-AS1?
SI8640AB-AS1 is configured at manufacture for low-default output: when VDD1 is unpowered (0 V) but VDD2 remains active, all OUTB pins drive logic low within 12 ns. This prevents unintended activation of downstream loads like gate drivers or relays during brownout or startup. The default state is fixed per part number - SI8640EB-AS1 would provide high-default instead, but SI8640AB-AS1 is strictly low-default.
Is SI8640AB-AS1 compatible with 1.8 V logic inputs?
No, SI8640AB-AS1 inputs require minimum 2.0 V for VIH and tolerate maximum 0.8 V for VIL, per its electrical specifications. It does not support 1.8 V CMOS logic directly. To interface with 1.8 V microcontrollers, use a level-shifter or select a variant like SI8640AB-IS1 (industrial grade) with identical specs but different qualification - though even that variant maintains the same 2.0 V VIH threshold. SI8640AB-AS1 must be driven from ≥2.5 V logic sources.
SI8640AB-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:
- -
- 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-AS1 FAQ
1.How can I place an order for SI8640AB-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8640AB-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 SI8640AB-AS1 reliable?
The price and inventory of SI8640AB-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8640AB-AS1 is usually 5 days.
3.What payment methods are accepted for SI8640AB-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8640AB-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8640AB-AS1?
SI8640AB-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8640AB-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 SI8640AB-AS1?
For technical support, including SI8640AB-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8640AB-AS1 requirements.
6.How does Aetrix verify that SI8640AB-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8640AB-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 SI8640AB-AS1 meets industry standards.
7.What is the process for return or replacement of SI8640AB-AS1?
All SI8640AB-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8640AB-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 SI8640AB-AS1 part is unused and in its original packaging.
Return procedure for SI8640AB-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8640AB-AS1 Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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