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Skyworks Solutions Inc. SI8651EB-AU
- Part No.:
- SI8651EB-AU
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8651EB-AU.pdf
- Description:
- AUTOMOTIVE 2.5 KV 4 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:2,765
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Product details
Overview
SI8651EB-AU from Skyworks is a five-channel, ultra-low-power digital isolator with 4 input channels on VDD1 side and 1 output channel on VDD2 side, rated for 2.5 kVRMS isolation and operating across –40 to +125 °C. It supports DC–150 Mbps data rates, achieves <10 ns propagation delay, and features Schmitt-trigger inputs, tri-state outputs with enable control, and selectable high-default fail-safe mode.
For engineers reviewing the SI8651EB-AU datasheet, SI8651EB-AU pinout, SI8651EB-AU application, or SI8651EB-AU equivalent, this page delivers verified electrical specs, functional partitioning (4:1 channel direction), fail-safe behavior under power loss, and automotive-grade qualification per AEC-Q100 - critical for isolated motor control, battery management, and industrial PLC I/O design.
Technical Context
The SI8651EB-AU implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its dual-supply architecture (VDD1/VDD2) supports independent 2.5–5.5 V operation per side, with undervoltage lockout (UVLO) monitoring each rail separately.
It integrates two enable inputs (EN1 on VDD1 side for A5; EN2 on VDD2 side for B1–B4), allowing independent tri-state control of input and output banks. The default-high output state (denoted by "E" in part number) is implemented via internal pull-ups on all I/Os, ensuring defined logic levels during VDD1 unpowered conditions while VDD2 remains active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Configuration | 4-input / 1-output directional isolation (A1–A4 → B1–B4; A5 ← B5) |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces including SPI, RS-485, and isolated CAN FD physical layer signaling |
| Propagation Delay | 5–13 ns - enables tight timing budgets in real-time motor control loops and fast ADC sampling synchronization |
| Isolation Rating | 2.5 kVRMS - certified to UL 1577, CSA 5A, VDE 0884-10, and CQC GB4943.1 for reinforced insulation |
| Supply Voltage Range | 2.375–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level shifters |
| Fail-Safe Default | High (logic 1) - maintains safe output state during VDD1 loss, critical for gate driver enable/disable sequencing |
| CMTI | ≥35 kV/µs - suppresses false triggering in high-dV/dt environments like IGBT/SiC inverter switching nodes |
Pinout & Package
SI8651EB-AU is housed in a RoHS-compliant QSOP-16 package (5.3 mm × 10.2 mm, 1.0 mm height), optimized for high-density PCB layouts and automated assembly. Pin assignments are validated per Skyworks' Si8650/51/52/55 Data Sheet Section 5.1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for input receivers (A1–A5) and EN1; must be ≥2.375 V for valid operation |
| GND1 | Input-side ground | Reference for A-side signals; requires dedicated 0.1 µF bypass capacitor to VDD1 |
| A1–A4 | Input channels | 4 digital inputs referenced to VDD1/GND1; Schmitt-triggered for >0.4 V hysteresis and noise rejection |
| A5 | Input channel with EN1 control | Input tied to EN1 function: when EN1 = L, A5 output enters high-impedance state |
| EN1 | Enable for A5 output | Active-high enable on VDD1 side; internally pulled up to VDD1 (2 µA); drives A5 into Hi-Z when low |
| VDD2 | Output-side supply | Power for output drivers (B1–B5) and EN2; supports independent voltage domain from VDD1 |
| GND2 | Output-side ground | Reference for B-side signals; requires dedicated 0.1 µF bypass capacitor to VDD2 |
| B1–B4 | Output channels | 4 isolated outputs driven by A1–A4; tri-stated when EN2 = L |
| B5 | Output channel | Isolated output driven by A5; follows A5 state when EN1 = H; Hi-Z when EN1 = L |
| EN2 | Enable for B1–B4 outputs | Active-high enable on VDD2 side; internally pulled up to VDD2 (2 µA); disables B1–B4 when low |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; enables 60-year lifetime at rated working voltage |
| Selectable fail-safe output | "E" suffix denotes factory-configured high-default state - ensures safe deactivation of downstream power stages during input-side brownout |
| Tri-state output control | Dual enable pins (EN1/EN2) allow independent bus arbitration and hot-swap capability without external logic |
| Ultra-low dynamic power | 6.6 mA per side at 100 Mbps (3.3 V), reducing thermal load in sealed enclosures and extending battery life in portable BMS |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40 to +125 °C with zero-defect manufacturing flow and PPAP documentation support |
Applications
| Motor Control Systems | Isolated Data Acquisition |
|---|---|
|
Use Scenario: Gate drive signal isolation for three-phase IGBT/SiC inverters in EV traction systems. IC Role / Device Role / Timing Role: Isolates PWM commands from MCU to gate driver ICs while maintaining <10 ns timing fidelity and >35 kV/µs CMTI. Use Value: Prevents shoot-through faults during high-dV/dt switching transients and enables compact, thermally efficient inverter designs. |
Use Scenario: Channel-to-channel isolation between multiple ADCs and microcontroller in medical patient monitors. IC Role / Device Role / Timing Role: Provides 4:1 directional isolation for sensor front-end digitization, preserving signal integrity at 1 MSPS sample rates. Use Value: Eliminates ground loop noise and meets IEC 60601-1 reinforced insulation requirements for patient-connected equipment. |
| Battery Management Systems | Industrial PLC I/O Modules |
|
Use Scenario: Cell voltage monitoring and pack-level communication isolation in automotive 400/800 V battery packs. IC Role / Device Role / Timing Role: Isolates UART/SPI lines between battery monitor ICs and system controller, supporting AEC-Q100 compliance. Use Value: Ensures reliable fault reporting and cell balancing command delivery under harsh EMI and thermal cycling conditions. |
Use Scenario: Digital input conditioning and status feedback isolation in modular PLC backplanes. IC Role / Device Role / Timing Role: Interfaces 24 V DC field sensors to 3.3 V logic with Schmitt-trigger inputs and fail-safe high default for safety shutdown. Use Value: Reduces component count vs. optocoupler solutions and enables deterministic response time for SIL-2 compliant diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8651BB-AU | Same 4:1 channel configuration and QSOP-16 package, but default-low fail-safe mode (B suffix) | Suitable where safety-critical outputs must default to logic 0 (e.g., disable-on-failure motor control) | Select SI8651BB-AU if system architecture requires active-low enable or reset assertion during power loss |
| ISO6741-Q1 | TI's 4-channel isolator with 5000 VRMS rating, 100 Mbps max rate, and different enable architecture (single EN pin) | Used in higher-isolation automotive applications (e.g., OBC primary-side control), but lacks independent A5/B5 enable | Choose ISO6741-Q1 only when 5 kVRMS reinforcement is mandatory and bidirectional channel flexibility is not required |
Compared with SI8651BB-AU, SI8651EB-AU provides guaranteed high-default outputs for fail-safe activation of downstream circuits; compared with ISO6741-Q1, it offers finer-grained enable control per channel bank and superior 150 Mbps throughput for high-resolution encoder interfaces.
Availability
SI8651EB-AU is available at Aetrix Electronics and suitable for battery management systems, motor control inverters, and industrial PLC I/O modules requiring stable component supply, automotive-grade reliability, and long-term lifecycle support.
Supply support for SI8651EB-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.
The SI8651EB-AU belongs to Skyworks' Si865x family of CMOS digital isolators, engineered for high-reliability industrial and automotive applications demanding low power, precise timing, and certified reinforced insulation.
FAQ
What is the isolation rating and safety certification status of the SI8651EB-AU?
The SI8651EB-AU is rated for 2.5 kVRMS isolation and certified to UL 1577 (1 min), CSA Component Notice 5A, VDE 0884-10, and CQC GB4943.1 standards. These approvals confirm its suitability for reinforced insulation in industrial and automotive end-equipment meeting IEC 60950-1, IEC 62368-1, and IEC 60601-1 requirements. All certifications apply directly to the SI8651EB-AU part number per Skyworks' official documentation.
How does the fail-safe default-high behavior of the SI8651EB-AU operate during power loss?
When VDD1 is unpowered while VDD2 remains active, the SI8651EB-AU drives all outputs (B1–B5) to logic high due to internal pull-up resistors - a factory-configured behavior indicated by the "E" in SI8651EB-AU. This ensures downstream circuits (e.g., gate drivers) remain disabled during input-side brownout. The state transitions within 1 µs after VDD1 powers up, matching the input signal.
Can the SI8651EB-AU support 150 Mbps data rates across all channels simultaneously?
Yes, the SI8651EB-AU supports DC to 150 Mbps per channel under specified conditions: VDD1/VDD2 = 5 V ±10%, CL = 15 pF, TA = –40 to +125 °C. Electrical specifications in Table 4.2 of the datasheet confirm timing parameters (e.g., 5–13 ns propagation delay, ≤4.5 ns pulse width distortion) remain valid at full data rate, enabling robust SPI clocking and high-speed serial link isolation.
What is the purpose of the two enable inputs (EN1 and EN2) on the SI8651EB-AU?
EN1 (on VDD1 side) controls the output state of B5, placing it in high-impedance when low; EN2 (on VDD2 side) controls B1–B4 outputs. This dual-enable architecture allows independent tri-state control of input and output banks - essential for bus sharing, hot-swap sequencing, and reducing standby power in multi-node systems. Both pins are internally pulled up to their respective VDD rails.
Is the SI8651EB-AU qualified for automotive applications, and what does the "-AU" suffix signify?
Yes, the "-AU" suffix explicitly denotes Automotive Grade qualification per AEC-Q100 Grade 1 (–40 to +125 °C), with full automotive process flows, AIAG-compliant PPAP documentation, IMDS/CAMDS material declarations, and zero-defect manufacturing controls. This makes SI8651EB-AU suitable for on-board chargers, battery management systems, and traction inverters in BEV/HEV platforms.
SI8651EB-AU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 5
- Inputs - Side 1/Side 2:
- 4/1
- 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
SI8651EB-AU FAQ
1.How can I place an order for SI8651EB-AU through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8651EB-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 SI8651EB-AU reliable?
The price and inventory of SI8651EB-AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8651EB-AU is usually 5 days.
3.What payment methods are accepted for SI8651EB-AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8651EB-AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8651EB-AU?
SI8651EB-AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8651EB-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 SI8651EB-AU?
For technical support, including SI8651EB-AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8651EB-AU requirements.
6.How does Aetrix verify that SI8651EB-AU is sourced from the original manufacturer or authorized distributors?
All SI8651EB-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 SI8651EB-AU meets industry standards.
7.What is the process for return or replacement of SI8651EB-AU?
All SI8651EB-AU units undergo pre-shipment inspection (PSI). If there is an issue with SI8651EB-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 SI8651EB-AU part is unused and in its original packaging.
Return procedure for SI8651EB-AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8651EB-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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