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Skyworks Solutions Inc. SI8640ET-AS2R
- Part No.:
- SI8640ET-AS2R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8640ET-AS2R.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:3,837
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Product details
Overview
SI8640ET-AS2R from Skyworks is a quad-channel, unidirectional digital isolator with 4-input/0-output channel configuration, 5 kVRMS reinforced isolation rating, and fail-safe default-high output state. It operates from 2.5–5.5 V, supports up to 150 Mbps data rate, achieves <10 ns propagation delay, and is qualified to AEC-Q100 for automotive battery management and on-board charger systems.
For engineers reviewing the SI8640ET-AS2R datasheet, SI8640ET-AS2R pinout, SI8640ET-AS2R application, or SI8640ET-AS2R equivalent, key selection criteria include its wide-body SOIC-16 package with 8 mm creepage, VDE 0884-10 reinforced certification, tri-state enable control, Schmitt-trigger inputs, and ultra-low power consumption at 100 Mbps (3.5 mA/channel @ 2.5 V).
Technical Context
The SI8640ET-AS2R implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and providing inherent noise immunity without optical components. Its architecture delivers precise timing with ≤0.5 ns channel-channel skew and ≤2 ns propagation delay skew across temperature (–40 to 125 °C).
All four channels reside on the input side (VDD1), with outputs referenced to VDD2; EN1 is not present, and EN2 is tied high internally per Si8640 configuration. The device uses Schmitt-trigger inputs (VT+ = 1.67 V typ, VT– = 1.23 V typ) and features undervoltage lockout (UVLO+ = 2.24 V, UVLO– = 2.16 V) on both sides for robust power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation, certified to VDE 0884-10 and UL 1577 - enables use in safety-critical automotive and industrial mains-connected systems. |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces including SPI, RS-485 transceiver control, and isolated ADC/DAC clock domains. |
| Propagation Delay | 8 ns typical - ensures tight timing alignment in real-time motor control and power inverter gate drive feedback loops. |
| Channel-Channel Skew | 0.5 ns max - guarantees deterministic phase relationship between isolated signals in multi-channel sensing or PWM synchronization. |
| Supply Voltage Range | 2.5–5.5 V on both sides - allows direct interfacing with 3.3 V microcontrollers and 5 V analog subsystems without level-shifting. |
| Fail-Safe Output State | Default High - maintains active-high enable or reset assertion during input-side power loss in BMS and OBC applications. |
| Common-Mode Transient Immunity | 60 kV/µs min - suppresses noise coupling in high-dV/dt environments like traction inverters and isolated DC-DC converters. |
Pinout & Package
SI8640ET-AS2R is housed in a RoHS-compliant wide-body SOIC-16 package (package code -AS2), featuring 8 mm creepage distance and standard WB SOIC-16 land pattern per Skyworks document #206329A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for all four input channels and internal transmitter; must be ≥2.5 V for valid operation. |
| GND1 | Input-side ground | Reference for input logic and internal RF oscillator; requires dedicated low-impedance return path. |
| IN1–IN4 | Digital input signals | Schmitt-triggered inputs accepting 2.5–5.5 V logic; no external pull-up/down required due to internal 10 µA pull-ups (default-high variant). |
| VDD2 | Output-side supply | Power for output drivers and receiver; independent of VDD1 - enables galvanic isolation between domains. |
| GND2 | Output-side ground | Reference for output logic; physically separated from GND1 by isolation barrier. |
| OUT1–OUT4 | Isolated digital outputs | CMOS-compatible outputs with 50 Ω nominal impedance; default high during VDD1 loss, tri-statable via EN2 (tied high internally). |
| EN2 | Output-enable control | Internally tied high per Si8640 family - permanently enables all four outputs; no external connection required. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; enables stable 60-year lifetime at rated working voltage. |
| Tri-state output control | EN2 pin (internally pulled high) allows permanent enable - simplifies PCB layout by removing external pull-up and control logic. |
| Reinforced VDE 0884-10 certification | Supports functional safety requirements in IEC 62368-1 and IEC 60601-1 systems without additional system-level isolation components. |
| Ultra-low power at 100 Mbps | 3.5 mA per channel @ 2.5 V - reduces thermal load in densely packed automotive ECUs and enables battery-powered diagnostics. |
| High CMTI immunity | 60 kV/µs minimum - prevents false triggering in noisy 800 V EV power stages and industrial motor drives. |
Applications
| Battery Management System (BMS) | On-Board Charger (OBC) |
|---|---|
Use Scenario: Isolating cell voltage monitoring ICs and pack contactor control signals in 400–800 V EV battery packs. IC Role / Device Role / Timing Role: Quad-channel isolator conveying analog front-end ADC data and fault status across high-voltage barrier with sub-10 ns latency. Use Value: Enables safe, real-time cell balancing decisions while meeting ASIL-D diagnostic coverage requirements via reinforced VDE 0884-10 certification. | Use Scenario: Separating 3.3 V MCU control logic from 5 V gate driver circuits in bidirectional AC/DC converters. IC Role / Device Role / Timing Role: Transmitting PWM enable/disable commands and current-sense fault flags across isolation boundary with deterministic 0.5 ns inter-channel skew. Use Value: Prevents shoot-through in SiC MOSFET half-bridges by ensuring synchronized, noise-immune gate signal delivery under 100 kV/µs transients. |
| Traction Inverter Control | Industrial Isolated Power Supply |
Use Scenario: Isolating position encoder feedback and IGBT desaturation detection signals in electric vehicle motor drives. IC Role / Device Role / Timing Role: Providing fail-safe high-default outputs that hold gate drivers in OFF state during MCU brownout or CAN bus interruption. Use Value: Meets ISO 26262 hardware fault tolerance requirements by guaranteeing safe shutdown without external supervision. | Use Scenario: Level-shifting and isolating communication lines (e.g., PMBus, I²C) between primary-side controller and secondary-side telemetry in medical-grade SMPS. IC Role / Device Role / Timing Role: Delivering isolated 150 Mbps control data with <5 ns pulse width distortion to maintain accurate voltage regulation loop timing. Use Value: Reduces BOM count by eliminating discrete level shifters and optocouplers while achieving 60-year reliability per IEC 60747-17. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM140E0BRZ | 4-channel, 150 Mbps, 3.75 kVRMS basic isolation; no VDE 0884-10 reinforced rating; 2.7–5.5 V supply. | Lacks reinforced certification for automotive BMS/OBC; suitable only for non-safety-critical industrial I/O isolation. | Select when cost sensitivity outweighs safety certification needs and 5 kVRMS is not mandated by end-equipment standards. |
| ISO7741FDWR | 4-channel, 100 Mbps, 5 kVRMS reinforced; TI's capacitive isolation; 1.71–5.5 V supply; higher 12 ns propagation delay. | Lower data rate limits SPI clock speed; lacks AEC-Q100 qualification; acceptable for industrial PLC backplanes but not automotive. | Choose for legacy designs already using TI's ISO77xx family or where wider supply range (1.71 V) is required for ultra-low-power MCU integration. |
Compared with ADUM140E0BRZ and ISO7741FDWR, SI8640ET-AS2R uniquely combines AEC-Q100 qualification, VDE 0884-10 reinforced certification, and 150 Mbps performance in a single automotive-grade device-making it the only option qualified for ISO 26262 ASIL-B compliant traction inverter gate drive control.
Availability
SI8640ET-AS2R is available at Aetrix Electronics and suitable for automotive battery management systems, on-board chargers, and industrial isolated power supplies requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SI8640ET-AS2R 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 automotive and industrial isolation applications demanding reinforced safety certification, ultra-low power, and precise timing-targeting EV powertrain, renewable energy inverters, and medical equipment.
FAQ
What is the isolation rating and safety certification of SI8640ET-AS2R?
SI8640ET-AS2R provides 5 kVRMS reinforced isolation and is certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1. It meets IEC 62368-1 and IEC 60601-1 requirements for reinforced insulation, making it suitable for automotive BMS and medical power supplies where double insulation is mandated.
Does SI8640ET-AS2R require external pull-up or pull-down resistors on its inputs?
No. SI8640ET-AS2R is the default-high variant (suffix "ET") and includes internal 10 µA pull-up resistors on all input pins. This eliminates the need for external biasing components, reducing BOM count and PCB area in space-constrained automotive modules.
What is the function of the EN2 pin on SI8640ET-AS2R?
EN2 on SI8640ET-AS2R is internally tied high per the Si8640 family specification. It permanently enables all four output drivers - no external connection or control logic is needed. This simplifies design and improves reliability compared to isolators requiring active enable management.
How does SI8640ET-AS2R handle power loss on the input side?
When VDD1 is lost, SI8640ET-AS2R asserts a logic-high state on all four outputs (fail-safe default-high mode). This behavior ensures critical functions like gate driver disable or contactor hold remain active during MCU brownout - a key requirement in ISO 26262-compliant automotive systems.
Is SI8640ET-AS2R compatible with 2.5 V microcontrollers?
Yes. SI8640ET-AS2R operates from 2.5 V to 5.5 V on both VDD1 and VDD2 sides. At 2.5 V, it draws only 3.5 mA per channel at 100 Mbps - enabling direct interface with low-voltage MCUs while maintaining full 150 Mbps capability and 60 kV/µs CMTI performance.
SI8640ET-AS2R 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:
- Magnetic Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 4/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- 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
SI8640ET-AS2R FAQ
1.How can I place an order for SI8640ET-AS2R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8640ET-AS2R 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 SI8640ET-AS2R reliable?
The price and inventory of SI8640ET-AS2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8640ET-AS2R is usually 5 days.
3.What payment methods are accepted for SI8640ET-AS2R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8640ET-AS2R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8640ET-AS2R?
SI8640ET-AS2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8640ET-AS2R 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 SI8640ET-AS2R?
For technical support, including SI8640ET-AS2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8640ET-AS2R requirements.
6.How does Aetrix verify that SI8640ET-AS2R is sourced from the original manufacturer or authorized distributors?
All SI8640ET-AS2R 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 SI8640ET-AS2R meets industry standards.
7.What is the process for return or replacement of SI8640ET-AS2R?
All SI8640ET-AS2R units undergo pre-shipment inspection (PSI). If there is an issue with SI8640ET-AS2R, 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 SI8640ET-AS2R part is unused and in its original packaging.
Return procedure for SI8640ET-AS2R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8640ET-AS2R Tags
-
ISO1212DBQR
Texas Instruments
-
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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