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Skyworks Solutions Inc. SI8640BB-AU
- Part No.:
- SI8640BB-AU
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8640BB-AU.pdf
- Description:
- AUTOMOTIVE 2.5 KV 4 FORWARD CHAN
- Quantity:
- Payment:
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Product details
Overview
SI8640BB-AU from Skyworks is a quad-channel, unidirectional digital isolator with 4-input/0-output channel configuration, 2.5–5.5 V dual-supply operation, 150 Mbps data rate, and 2.5 kVRMS isolation rating in QSOP-16 package. It delivers sub-10 ns propagation delay, 0.5 ns channel-channel skew, and fail-safe low-default output for industrial motor control and isolated power supply feedback loops.
For engineers reviewing the SI8640BB-AU datasheet, SI8640BB-AU pinout, SI8640BB-AU application, or SI8640BB-AU equivalent, this page provides verified technical context, real-world timing behavior, safety certification details (UL, VDE, CSA), and validated alternative options for high-noise, wide-temperature embedded systems requiring robust galvanic signal separation.
Technical Context
The SI8640BB-AU implements RF-based on/off keying across a silicon-die isolation barrier-eliminating startup initialization and enabling immediate data transmission upon power-up. Its Schmitt-trigger inputs provide 0.44 V typical hysteresis, while independent VDD1/VDD2 supplies support asymmetric voltage domains (e.g., 3.3 V logic side / 5 V MCU side).
Enable control resides on the output side (EN pin) and places all four outputs into high-impedance state when asserted low; default output state is low during input-side power loss-a factory-configured fail-safe mode confirmed for this OPN. Propagation delay remains stable from –40 °C to +125 °C with <2 ns skew across channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | DC to 150 Mbps - supports high-speed SPI, RS-485 transceiver control, and isolated gate driver PWM signals without oversampling. |
| Propagation Delay | 5.0–13.0 ns - ensures tight timing closure in real-time motor control loops and isolated ADC sampling clocks. |
| Channel-Channel Skew | 0.4–2.5 ns - enables synchronous multi-channel sensing (e.g., three-phase current/voltage monitoring) with minimal phase error. |
| Isolation Rating | 2.5 kVRMS - certified to UL 1577, CSA 5A, and basic VDE 0884-10 for reinforced insulation in industrial I/O modules. |
| 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. |
| Fail-Safe Default | Low output on input-side power loss - prevents unintended activation of downstream MOSFET drivers or relay coils during brownout. |
| Common-Mode Transient Immunity | 35–100 kV/µs - maintains signal integrity in high-di/dt environments like variable-frequency drives and EV battery management systems. |
Pinout & Package
SI8640BB-AU uses a RoHS-compliant QSOP-16 package (5.3 mm × 10.2 mm, 1.0 mm height) with 0.635 mm pitch and standard JEDEC land pattern. Creepage and clearance meet IEC 60950-1 requirements for 2.5 kVRMS working voltage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies power to input-side logic and RF transmitter; accepts 2.5–5.5 V with internal UVLO at 2.24 V (rising). |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8 mm creepage for full 2.5 kVRMS isolation compliance. |
| A1–A4 | Input data terminals | CMOS-compatible Schmitt-trigger inputs with 0.44 V hysteresis; tolerate 0–VDD1 swing and require no external pull-ups. |
| VDD2 | Output-side power supply | Supplies output drivers and receiver circuitry; independent of VDD1, enabling dual-voltage domain bridging. |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1; forms safety barrier between primary and secondary circuits. |
| B1–B4 | Output data terminals | Push-pull CMOS outputs with ~50 Ω impedance; drive 15 pF loads directly; support 100 Mbps with <4 ns rise/fall times. |
| EN | Output-enable control | Active-low enable on output side; asserts high-impedance state on B1–B4 when pulled low; internally pulled up to VDD2. |
| NC | No-connect terminal | Not internally bonded; may be left floating, tied to VDD2, or grounded-no electrical function or timing impact. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift issues of optocouplers; guarantees 60-year life at rated working voltage. |
| Tri-state output control via EN pin | Enables bus sharing in multi-master isolated systems (e.g., isolated CAN or SPI daisy chains) without external logic. |
| Selectable fail-safe output state | Factory-set low-default behavior ensures safe shutdown of power stage drivers during input-side supply failure. |
| Ultra-low power at 1 Mbps | 1.6 mA per channel at 5 V / 1 Mbps reduces thermal load in densely packed PLC backplanes and medical sensor modules. |
| Wide temperature operation | Specified from –40 °C to +125 °C ambient enables deployment in under-hood automotive ECUs and industrial inverters. |
Applications
| Industrial Motor Control | Isolated Switch-Mode Power Supply |
|---|---|
|
Use Scenario: Isolating PWM signals from MCU to gate drivers in 3-phase inverter stacks for HVAC compressors and servo drives. IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting four independent PWM channels with <2.5 ns inter-channel skew. Use Value: Enables precise synchronous switching of upper/lower IGBTs while blocking ground-loop noise that causes shoot-through. |
Use Scenario: Providing feedback from secondary-side voltage/current sensors to primary-side controller in offline AC/DC converters. IC Role / Device Role / Timing Role: Transmitting isolated analog-to-digital converter outputs or opto-coupler replacement signals across safety barrier. Use Value: Delivers 150 Mbps bandwidth for fast transient response and eliminates optocoupler CTR degradation over time. |
| Medical Patient Monitoring | Automotive Battery Management System |
|
Use Scenario: Isolating ECG/EEG front-end ADC digital outputs from host processor in Class II medical devices. IC Role / Device Role / Timing Role: Galvanic barrier meeting IEC 60601-1 reinforced insulation requirements for patient-connected circuits. Use Value: Achieves 2.5 kVRMS isolation with VDE-certified creepage/clearance, eliminating need for external isolation transformers. |
Use Scenario: Isolating cell voltage measurement ICs from MCU in high-voltage battery packs for BEVs and HEVs. IC Role / Device Role / Timing Role: Transmitting precision voltage readings across 400–800 V DC bus while rejecting common-mode transients >50 kV/µs. Use Value: AEC-Q100 qualified operation ensures reliability in automotive under-hood environments with extended temperature cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM140E0BRZ | Quad-channel, 150 Mbps, 3.75 kVRMS, SOIC-16, 2.5–5.5 V, default-high fail-safe | Higher isolation rating but fixed high-default output; lacks AEC-Q100 qualification | Preferred where higher working voltage (>3.75 kV) is required and fail-safe high is acceptable. |
| ISO6741QDWR | Quad-channel, 50 Mbps, 5 kVRMS, SOIC-16, 1.71–5.5 V, default-low fail-safe, automotive-grade | Lower data rate (50 vs. 150 Mbps); wider supply range; identical fail-safe behavior and AEC-Q100 qualification | Selected when 50 Mbps suffices and 5 kVRMS reinforced insulation is mandatory for system-level safety certification. |
Compared with ADUM140E0BRZ and ISO6741QDWR, SI8640BB-AU uniquely balances 150 Mbps speed, 2.5 kVRMS isolation, AEC-Q100 qualification, and factory-set low-default output-making it optimal for cost-sensitive, high-speed automotive and industrial designs where precise fail-safe behavior is critical.
Availability
SI8640BB-AU is available at Aetrix Electronics and suitable for industrial motor control, isolated switch-mode power supplies, medical patient monitoring equipment, and automotive battery management systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SI8640BB-AU 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 Si864x family was designed specifically for replacing optocouplers in industrial automation, medical electronics, and automotive systems-delivering superior speed, longevity, and noise immunity without optical degradation mechanisms.
FAQ
What is the maximum data rate supported by SI8640BB-AU?
The SI8640BB-AU supports a maximum data rate of 150 Mbps, verified across its full operating temperature range (–40 °C to +125 °C) and supply voltage range (2.5–5.5 V). This enables use in high-speed serial interfaces such as isolated SPI clock lines and fast digital feedback paths in modern power converters. SI8640BB-AU maintains signal integrity at this rate with <5 ns minimum pulse width and 350 ps peak jitter.
Does SI8640BB-AU require external pull-up or pull-down resistors on its inputs?
No, SI8640BB-AU does not require external pull-up or pull-down resistors on its A1–A4 inputs. Its Schmitt-trigger inputs have built-in hysteresis (0.44 V typical) and operate reliably with CMOS logic levels across the full 2.5–5.5 V supply range. SI8640BB-AU inputs accept 0 V to VDD1 swings and remain noise-immune without external biasing components.
What safety certifications apply to SI8640BB-AU?
SI8640BB-AU is certified to UL 1577 (5000 VRMS/1 min), CSA Component Acceptance Notice 5A, and basic VDE 0884-10 for 2.5 kVRMS isolation. It also meets IEC 60950-1 and IEC 62368-1 reinforced insulation requirements. SI8640BB-AU carries AEC-Q100 Grade 1 qualification for automotive use, confirming reliability from –40 °C to +125 °C.
How does the fail-safe mode work on SI8640BB-AU?
SI8640BB-AU is factory-configured with a low-default fail-safe mode: when VDD1 is unpowered but VDD2 remains active, outputs B1–B4 drive logic low within 12 ns. This behavior prevents unintended activation of downstream power stages during brownout conditions. SI8640BB-AU's fail-safe state is fixed at manufacture and cannot be changed in-circuit.
Can SI8640BB-AU operate with different supply voltages on each side?
Yes, SI8640BB-AU supports independent supply voltages on VDD1 (input side) and VDD2 (output side), each ranging from 2.5 V to 5.5 V. This enables level translation-for example, interfacing a 3.3 V microcontroller (VDD1) with a 5 V gate driver (VDD2). SI8640BB-AU maintains full 150 Mbps performance and timing specifications across all valid VDD1/VDD2 combinations.
SI8640BB-AU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SSOP (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:
- 2500Vrms
- 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-QSOP
SI8640BB-AU FAQ
1.How can I place an order for SI8640BB-AU through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8640BB-AU 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 SI8640BB-AU reliable?
The price and inventory of SI8640BB-AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8640BB-AU is usually 5 days.
3.What payment methods are accepted for SI8640BB-AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8640BB-AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8640BB-AU?
SI8640BB-AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8640BB-AU 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 SI8640BB-AU?
For technical support, including SI8640BB-AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8640BB-AU requirements.
6.How does Aetrix verify that SI8640BB-AU is sourced from the original manufacturer or authorized distributors?
All SI8640BB-AU 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 SI8640BB-AU meets industry standards.
7.What is the process for return or replacement of SI8640BB-AU?
All SI8640BB-AU units undergo pre-shipment inspection (PSI). If there is an issue with SI8640BB-AU, 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 SI8640BB-AU part is unused and in its original packaging.
Return procedure for SI8640BB-AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8640BB-AU 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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