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Skyworks Solutions Inc. SI8640ET-AS2
- Part No.:
- SI8640ET-AS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8640ET-AS2.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:2,753
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Product details
Overview
SI8640ET-AS2 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 supplies, 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-AS2 datasheet, SI8640ET-AS2 pinout, SI8640ET-AS2 application, or SI8640ET-AS2 equivalent, this page delivers verified electrical specs, SOIC-16 wide-body package details, fail-safe mode behavior, and automotive-grade isolation performance - critical for high-reliability power conversion and EV subsystem design.
Technical Context
The SI8640ET-AS2 implements RF-based on/off keying across a silicon dioxide isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture supports independent undervoltage lockout (UVLO) on both sides, with VDDUV+ = 2.24 V (typ) and hysteresis of 70 mV (typ).
All four channels are input-only on Side A (VDD1), driving outputs on Side B (VDD2); EN1 is not present, and EN2 is tied high internally per Si8640 family definition. The device uses Schmitt-trigger inputs (VT+ = 1.67 V, VT– = 1.23 V) and delivers tri-state outputs via EN2 control, with precise timing: 0.5 ns channel-channel skew and 2 ns propagation delay skew.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS reinforced insulation (VDE 0884-10 certified, 10 kV surge capable) |
| Data Rate | DC to 150 Mbps - supports high-speed CAN FD, SPI, and isolated ADC interface clocking |
| Propagation Delay | 8.0 ns (typ) - enables sub-10 ns timing-critical feedback loops in motor control inverters |
| Supply Voltage Range | 2.5–5.5 V on both sides - interoperable with 3.3 V microcontrollers and 5 V analog front-ends |
| Fail-Safe Output State | Default-high - ensures safe logic-high assertion during VDD1 loss in battery monitoring circuits |
| Common-Mode Transient Immunity | 60 kV/µs (typ) - maintains signal integrity in noisy 650 V IGBT gate-drive environments |
| Operating Temperature | –40 °C to +125 °C - validated for under-hood automotive use per AEC-Q100 Grade 1 |
Pinout & Package
SI8640ET-AS2 is housed in a RoHS-compliant wide-body SOIC-16 package (8 mm creepage, -IS2 variant), optimized for reinforced insulation in high-voltage industrial and automotive applications. Pin assignments follow standard Si864x layout with dedicated VDD1/GND1 and VDD2/GND2 pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Input A1–A4 (Side A) | CMOS/Schmitt-trigger inputs referenced to VDD1; accept 2.5–5.5 V logic levels |
| 5, 6, 7, 8 | GND1 | Side A ground reference; must be separated from GND2 by ≥8 mm creepage |
| 9, 10, 11, 12 | Output B1–B4 (Side B) | Push-pull CMOS outputs referenced to VDD2; 50 Ω nominal impedance |
| 13, 14, 15, 16 | VDD2, GND2, VDD1, EN2 | VDD2 (13), GND2 (14), VDD1 (15), EN2 (16) - EN2 controls all B-side outputs; internal pull-up |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Silicon dioxide dielectric enables 60-year lifetime at rated working voltage and eliminates LED aging |
| Selectably default-high output | Guarantees fail-safe logic-high on B-side when VDD1 is lost - critical for BMS fault signaling |
| Tri-state output control | EN2 pin places all four B outputs in high-impedance state, enabling bus sharing in multi-master systems |
| Ultra-low power at 100 Mbps | 5.5 mA per channel at 5 V - reduces thermal load in densely packed traction inverter control boards |
| Automotive qualification | AEC-Q100 Grade 1, AIAG PPAP support, IMDS/CAMDS compliance - meets OEM supply chain requirements |
Applications
| Battery Management System (BMS) | On-Board Charger (OBC) |
|---|---|
|
Use Scenario: Isolating cell voltage monitor ICs from MCU in high-voltage battery packs (up to 900 V). IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting analog front-end ADC status and fault flags across 5 kVRMS barrier. Use Value: Default-high fail-safe ensures "fault present" signal remains asserted during primary-side power loss, preventing silent failure. |
Use Scenario: Signal isolation between PFC controller and DC-link voltage sensing in 11 kW OBCs. IC Role / Device Role / Timing Role: Transmitting isolated PWM enable signals and current-sense alerts across reinforced barrier with <10 ns delay. Use Value: 60 kV/µs CMTI prevents false triggering during fast-switching transients in SiC-based power stages. |
| Traction Inverter Control | Industrial Motor Drive |
|
Use Scenario: Isolating gate driver enable/disable commands from vehicle MCU to isolated half-bridge drivers. IC Role / Device Role / Timing Role: Delivering synchronized, low-skew (0.5 ns) enable signals to multiple IGBT/SiC drivers on high-side and low-side rails. Use Value: 2 ns propagation delay skew ensures matched turn-on timing across parallel inverter legs, minimizing shoot-through risk. |
Use Scenario: Isolating encoder position data and safety stop commands in servo drives operating at 400 VAC mains. IC Role / Device Role / Timing Role: Bidirectional-capable isolator used unidirectionally for real-time position feedback and emergency stop assertion. Use Value: SOIC-16 wide-body package provides 8 mm creepage - satisfies IEC 61800-5-1 reinforced insulation for functional safety. |
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 |
|---|---|---|---|
| SI8640ET-IS2 | Industrial-grade version; identical electrical specs and SOIC-16 wide-body (-IS2) package, but lacks AEC-Q100 qualification and PPAP documentation | Not approved for automotive production; suitable for industrial motor drives or medical equipment where automotive certification is unnecessary | Choose SI8640ET-IS2 only if automotive qualification is not required and cost sensitivity outweighs long-term supply assurance. |
| ADUM140E0BRWZ | 4-channel, default-high isolator with 3.75 kVRMS rating (not reinforced), 150 Mbps, but higher 12 ns max propagation delay and no AEC-Q100 grade | Limited to non-automotive industrial applications due to lower isolation rating and absence of automotive qualification | Consider ADUM140E0BRWZ only for legacy designs already using ADI's iCoupler platform and where 5 kVRMS reinforcement is not mandated. |
Compared with SI8640ET-IS2 and ADUM140E0BRWZ, the SI8640ET-AS2 uniquely combines AEC-Q100 Grade 1 qualification, VDE 0884-10 reinforced certification at 5 kVRMS, and guaranteed default-high fail-safe behavior - making it the only option qualified for safety-critical automotive battery and traction systems.
Availability
SI8640ET-AS2 is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, and traction inverters requiring stable component supply across automotive production lifecycles.
Supply support for SI8640ET-AS2 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 needs, emphasizing reinforced safety certification, ultra-low power, and robust transient immunity in harsh EMI environments.
FAQ
What is the isolation rating and certification status of SI8640ET-AS2?
The SI8640ET-AS2 provides 5000 VRMS reinforced isolation and is certified to VDE 0884-10 (reinforced), UL 1577, CSA 5A, and CQC GB4943.1. It also meets IEC 60601-1 and IEC 62368-1 for medical and information technology equipment, with 10 kV surge capability - all verified per Skyworks' official datasheet Rev. 206329A.
Does SI8640ET-AS2 support fail-safe operation, and how is it configured?
Yes, SI8640ET-AS2 is factory-configured for default-high fail-safe operation: when VDD1 is unpowered but VDD2 is active, all four B-side outputs assert logic high. This behavior is fixed by ordering code "ET" and does not require external configuration - confirmed in Table 1.1 and Section 3.4 of the Si864x datasheet.
What package type and creepage distance does SI8640ET-AS2 use?
SI8640ET-AS2 uses the SOIC-16 wide-body package with "-AS2" suffix, indicating the IS2 variant that eliminates tie bars to achieve 8 mm creepage while maintaining standard SOIC-16 land pattern - explicitly defined in Note 4 of the Ordering Guide and Package Outline Figure 6.
Is SI8640ET-AS2 pin-compatible with other Si864x variants like SI8640BB-AS2?
No - SI8640ET-AS2 and SI8640BB-AS2 share the same SOIC-16 wide-body (-AS2) package and pinout, but differ in fail-safe default state (high vs. low) and isolation rating (5 kV vs. 2.5 kV). Electrical compatibility requires verifying VDD, loading, and system-level safety requirements per each device's certified rating.
What is the maximum data rate and propagation delay specification for SI8640ET-AS2?
SI8640ET-AS2 supports up to 150 Mbps with a typical propagation delay of 8.0 ns and maximum of 13 ns over –40 °C to +125 °C, as specified in Table 4.2 "Timing Characteristics" of the Si864x datasheet. Pulse width distortion is limited to 4.5 ns (max), ensuring clean eye diagrams at full speed.
SI8640ET-AS2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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-AS2 FAQ
1.How can I place an order for SI8640ET-AS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8640ET-AS2 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-AS2 reliable?
The price and inventory of SI8640ET-AS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8640ET-AS2 is usually 5 days.
3.What payment methods are accepted for SI8640ET-AS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8640ET-AS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8640ET-AS2?
SI8640ET-AS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8640ET-AS2 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-AS2?
For technical support, including SI8640ET-AS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8640ET-AS2 requirements.
6.How does Aetrix verify that SI8640ET-AS2 is sourced from the original manufacturer or authorized distributors?
All SI8640ET-AS2 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-AS2 meets industry standards.
7.What is the process for return or replacement of SI8640ET-AS2?
All SI8640ET-AS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8640ET-AS2, 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-AS2 part is unused and in its original packaging.
Return procedure for SI8640ET-AS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8640ET-AS2 Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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