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Skyworks Solutions Inc. SI8640BC-AS1
- Part No.:
- SI8640BC-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8640BC-AS1.pdf
- Description:
- AUTOMOTIVE 3.75 KV 4-CHANNEL DIG
- Quantity:
- Payment:
- Shipping:
Inventory:3,379
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Product details
Overview
SI8640BC-AS1 from Skyworks is a quad-channel, unidirectional digital isolator with 4-input/0-output channel configuration, 3.75 kVRMS isolation rating, and fail-safe default-low output state. It operates from 2.5–5.5 V supplies, supports DC to 150 Mbps data rates, achieves <10 ns propagation delay, and targets isolated communication in industrial motor drives and battery management systems.
For engineers reviewing the SI8640BC-AS1 datasheet, SI8640BC-AS1 pinout, SI8640BC-AS1 application, or SI8640BC-AS1 equivalent, key selection criteria include its narrow-body SOIC-16 package, reinforced insulation compliance (VDE 0884-10 basic), AEC-Q100 automotive qualification, and tri-state enable control for output drive management.
Technical Context
The SI8640BC-AS1 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering superior noise immunity versus optocouplers. Its four isolated channels are all input-side referenced (VDD1 side), with outputs on the isolated VDD2 side driven only by the input signals.
It features Schmitt-trigger inputs for high noise rejection, a single EN pin controlling all four outputs (EN = L forces high-impedance), and selectable fail-safe behavior (low-default here) activated during VDD1 loss while VDD2 remains powered. Propagation delay skew is ≤2.5 ns and pulse width distortion ≤4.5 ns at 150 Mbps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3.75 kVRMS - meets reinforced insulation requirements per IEC 62368-1 and basic VDE 0884-10 for system-level safety certification. |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces including SPI, RS-485 transceiver control, and isolated ADC/DAC timing. |
| Propagation Delay | 5–13 ns - enables tight-timing control loops in motor gate drivers and real-time power converter feedback paths. |
| Supply Voltage Range | 2.5–5.5 V - interoperable with 3.3 V and 5 V logic domains on both sides without level-shifting circuitry. |
| Channel Configuration | 4-input / 0-output - all four channels transmit from primary (VDD1) to secondary (VDD2) side; no reverse-direction signals. |
| Fail-Safe Default | Low - outputs drive logic low when VDD1 is unpowered but VDD2 remains active, preventing undefined states in BMS fault handling. |
| CMTI | ≥35 kV/µs - maintains signal integrity under fast common-mode transients typical in inverters and SMPS switching nodes. |
Pinout & Package
Narrow-body SOIC-16 (NB SOIC-16) package with 1.27 mm pitch, RoHS-compliant, JEDEC-standard reflow profile (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | VDD1 Power Supply | Primary-side supply (2.5–5.5 V); bypass capacitor required between each VDD1 and GND1. |
| 5, 6, 7, 8 | GND1 Ground Reference | Primary-side ground return; must be separated from GND2 by isolation barrier. |
| 9, 10, 11, 12 | A1–A4 Inputs | CMOS-compatible Schmitt-trigger inputs; accept 2.0 V VIH min and 0.8 V VIL max at 5 V operation. |
| 13 | EN | Enable control for all four outputs; logic low places B1–B4 in high-impedance state. |
| 14, 15, 16 | VDD2, GND2, B1–B4 | VDD2 (2.5–5.5 V), isolated GND2, and four CMOS outputs with 50 Ω nominal impedance and 4 mA drive capability. |
Key Features
| Feature | Design Value |
|---|---|
| RF-Based Isolation Architecture | Eliminates startup delay and optical degradation; enables immediate data transmission after power-on with no handshake or calibration. |
| Tri-State Output Enable | Single EN pin disables all four outputs simultaneously into high-impedance, enabling bus sharing and hot-swap compatibility. |
| Selectable Fail-Safe Mode | Factory-configured low-default output ensures safe shutdown state in BMS or PLC I/O modules during primary-side power loss. |
| Ultra-Low Power at High Speed | 5.5 mA per channel at 100 Mbps (5 V), reducing thermal load in dense industrial PCB layouts and extending battery life in portable test equipment. |
| High CMTI & Noise Immunity | 35–60 kV/µs common-mode transient immunity prevents glitches in noisy motor drive environments with fast dV/dt switching. |
Applications
| Industrial Motor Control | Isolated Power Supply Monitoring |
|---|---|
Use Scenario: Gate driver signal isolation in 3-phase inverter stacks for HVAC compressors and servo drives. IC Role / Device Role / Timing Role: Transmits PWM enable/disable and fault feedback signals across isolation barrier with <13 ns delay and <2.5 ns skew. Use Value: Enables precise synchronous switching of IGBTs/MOSFETs while blocking 1500 V common-mode transients from power stage noise. |
Use Scenario: Monitoring output voltage/current sense lines in isolated DC-DC converters for telecom and server PSUs. IC Role / Device Role / Timing Role: Digitally isolates analog-to-digital converter (ADC) serial interface (e.g., SPI) from primary-side controller. Use Value: Maintains 150 Mbps throughput for real-time telemetry without adding propagation delay that would destabilize regulation loops. |
| Battery Management Systems | Medical Isolated Data Acquisition |
Use Scenario: Cell voltage monitoring and pack contactor control in EV traction battery packs. IC Role / Device Role / Timing Role: Isolates microcontroller GPIOs driving precharge/disconnect relays and reading isolated ADCs. Use Value: 3.75 kVRMS rating satisfies IEC 61000-4-5 surge requirements; fail-safe low output prevents unintended relay closure during MCU reset. |
Use Scenario: Isolating ECG/EEG front-end ADC streams from USB or Ethernet host processors in diagnostic equipment. IC Role / Device Role / Timing Role: Provides reinforced insulation barrier meeting IEC 60601-1 creepage/clearance and leakage current limits. Use Value: Enables 150 Mbps SPI streaming from multi-channel ADCs while maintaining patient safety isolation and low EMI emissions. |
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 | 2.5 kVRMS isolation rating; identical pinout, timing, and electrical specs except lower isolation voltage. | Suitable for non-reinforced insulation applications where 2.5 kV meets system-level safety standards (e.g., Class I appliances). | Select SI8640BB-AS1 when 3.75 kV is not mandated by end-equipment regulatory testing-reduces cost without sacrificing performance. |
| ISO6740QDWR | Texas Instruments part; 5000 VRMS reinforced rating (VDE 0884-10), 50 Mbps max data rate, different pinout (SOIC-16 WB), higher quiescent current. | Used in automotive BMS where 5 kV and AEC-Q100 Grade 1 (–40°C to 125°C) are required, but bandwidth-critical functions are handled elsewhere. | Choose ISO6740QDWR only if VDE-reinforced certification and TI supply-chain alignment outweigh the 100 Mbps bandwidth penalty and layout redesign. |
Compared with SI8640BC-AS1, SI8640BB-AS1 offers identical functionality at lower isolation voltage and cost, while ISO6740QDWR trades speed and pin compatibility for higher certified isolation and TI ecosystem support-neither is pin-compatible, requiring PCB revision.
Availability
SI8640BC-AS1 is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and medical data acquisition requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability.
Supply support for SI8640BC-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 for high-reliability industrial and automotive isolation needs-delivering ultra-low-power, high-speed digital signal transfer across reinforced barriers without optical aging or startup delays.
FAQ
What is the isolation voltage rating of the SI8640BC-AS1 and which safety standards does it meet?
The SI8640BC-AS1 has a 3.75 kVRMS isolation rating and is certified to UL 1577 (5000 VRMS for 1 minute), CSA Component Notice 5A, IEC 60950-1 and 62368-1 (basic insulation), and VDE 0884-10 (basic). It is not VDE-reinforced certified-only Si864xxT variants carry that rating. This makes SI8640BC-AS1 appropriate for systems requiring 3.75 kV working voltage with basic insulation architecture.
Does the SI8640BC-AS1 require external components for stable operation?
Yes-the SI8640BC-AS1 requires a 0.1 µF ceramic bypass capacitor between each VDD pin (VDD1 and VDD2) and its respective ground (GND1/GND2), placed as close as possible to the pins. No pull-up/pull-down resistors are needed: internal 2 µA fail-safe biasing is factory-configured for low-default operation. External series termination (50–300 Ω) is optional for noisy environments.
How does the enable (EN) pin function on the SI8640BC-AS1?
The EN pin on SI8640BC-AS1 controls all four outputs (B1–B4) simultaneously: logic high enables normal signal transmission, while logic low forces all outputs into high-impedance state. EN is internally pulled up to VDD2, so it may be left floating-but in noisy environments, Skyworks recommends tying it to VDD2 or GND. The EN-to-output delay is ≤11 ns, supporting fast bus arbitration.
Is the SI8640BC-AS1 qualified for automotive applications?
Yes-SI8640BC-AS1 carries the "-AS1" suffix indicating Automotive Grade qualification. It is manufactured using full automotive process flows, qualified to AEC-Q100 Grade 1 (–40°C to +125°C), and supported with AIAG-compliant PPAP documentation, IMDS/CAMDS listings, and zero-defect methodology throughout production.
What is the maximum achievable data rate and timing precision of the SI8640BC-AS1?
The SI8640BC-AS1 supports DC to 150 Mbps data rates with guaranteed minimum pulse width of 5 ns. Its typical propagation delay is 8 ns (max 13 ns), pulse width distortion is ≤4.5 ns, and channel-to-channel skew is ≤2.5 ns. These values are specified over –40°C to +125°C and 2.5–5.5 V supply range, enabling deterministic timing in closed-loop motor control and isolated ADC interfaces.
SI8640BC-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:
- 4/0
- 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
SI8640BC-AS1 FAQ
1.How can I place an order for SI8640BC-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8640BC-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 SI8640BC-AS1 reliable?
The price and inventory of SI8640BC-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8640BC-AS1 is usually 5 days.
3.What payment methods are accepted for SI8640BC-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8640BC-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8640BC-AS1?
SI8640BC-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8640BC-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 SI8640BC-AS1?
For technical support, including SI8640BC-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8640BC-AS1 requirements.
6.How does Aetrix verify that SI8640BC-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8640BC-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 SI8640BC-AS1 meets industry standards.
7.What is the process for return or replacement of SI8640BC-AS1?
All SI8640BC-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8640BC-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 SI8640BC-AS1 part is unused and in its original packaging.
Return procedure for SI8640BC-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8640BC-AS1 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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