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Skyworks Solutions Inc. SI8651BB-AU
- Part No.:
- SI8651BB-AU
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8651BB-AU.pdf
- Description:
- AUTOMOTIVE 2.5 KV 4 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:4,958
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Product details
Overview
SI8651BB-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, supporting up to 150 Mbps data rate, <10 ns propagation delay, and 2.5 kVRMS isolation in QSOP-16 package. It features Schmitt-trigger inputs, tri-state outputs with enable control, and selectable fail-safe low-default output state-designed for isolated communication in battery management systems and motor control interfaces.
For engineers reviewing the SI8651BB-AU datasheet, SI8651BB-AU pinout, SI8651BB-AU application, or SI8651BB-AU equivalent, key selection criteria include channel directionality (4:1), fail-safe low default, 2.5 kVRMS QSOP-16 isolation rating, and AEC-Q100 qualification for automotive use cases requiring robust signal integrity across wide temperature ranges (–40 to +125 °C).
Technical Context
The SI8651BB-AU implements RF-based on/off keying modulation across a semiconductor isolation barrier, eliminating startup initialization and enabling deterministic timing without clock recovery circuitry. Its dual-supply architecture (VDD1/VDD2) supports independent 2.5–5.5 V operation per side, with undervoltage lockout (UVLO) monitoring each rail separately.
Enable inputs EN1 and EN2 provide independent tri-state control: EN1 disables output A5, while EN2 disables outputs B1–B4. The device uses Schmitt-trigger inputs (VT+ = 1.67 V typ, VT– = 1.23 V typ) for >0.4 V hysteresis and achieves 50 kV/µs common-mode transient immunity at 1500 VCM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels & Direction | 5-channel: 4 unidirectional inputs on VDD1 side, 1 unidirectional output on VDD2 side-enables asymmetric signal routing in isolated feedback loops. |
| Max Data Rate | 150 Mbps-supports high-speed serial links such as isolated SPI clock/data lines or PWM gate drive signals. |
| Propagation Delay | 8.0 ns typical (max 13 ns)-ensures tight timing alignment in real-time motor control and power converter feedback paths. |
| Isolation Rating | 2.5 kVRMS for 1 minute-meets reinforced insulation requirements per UL 1577, VDE 0884-10, and IEC 62368-1 for industrial and automotive safety compliance. |
| Supply Voltage Range | 2.5–5.5 V per side-allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting. |
| Fail-Safe Default | Low output state during VDD1 loss-prevents unintended activation of downstream drivers or actuators in power-loss scenarios. |
| Operating Temperature | –40 to +125 °C-qualified per AEC-Q100 Grade 1 for under-hood automotive applications including on-board chargers and traction inverters. |
Pinout & Package
SI8651BB-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 with creepage/clearance >8.0 mm between isolation barriers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for input-side logic and transmitter; must be bypassed with 0.1 µF capacitor near pin. |
| GND1 | Input-side ground | Reference return for VDD1 and all input signals (A1–A4, EN1); requires low-inductance connection. |
| A1–A4 | Input channels | 4 digital inputs referenced to VDD1/GND1; Schmitt-triggered for noise immunity in noisy motor drive environments. |
| EN1 | Enable for A5 output | Active-high control for output A5; internal 2 µA pull-up allows floating if unused, but external tie-off recommended in noisy settings. |
| VDD2 | Output-side supply | Power for output-side logic and receiver; independent of VDD1-enables galvanic separation of domains. |
| GND2 | Output-side ground | Reference return for VDD2 and outputs (B1–B4, A5); physically isolated from GND1 by semiconductor barrier. |
| B1–B4 | Output channels | 4 digital outputs referenced to VDD2/GND2; tri-state capable via EN2; 50 Ω nominal output impedance for controlled-impedance trace routing. |
| A5 | Output channel | Single output on VDD2 side, enabled/disabled by EN1; configured as fail-safe low during VDD1 loss per ordering option. |
| EN2 | Enable for B1–B4 | Active-high control for outputs B1–B4; independent of EN1-supports selective channel gating in multi-signal isolation. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates startup initialization and enables immediate data transmission upon power-up-critical for fast-recovery systems like EV battery disconnect controls. |
| Tri-state outputs with dual enable pins | EN1 and EN2 allow independent high-impedance control of A5 and B1–B4 groups-enables bus sharing and dynamic reconfiguration in isolated communication backplanes. |
| Selectable fail-safe output state | Low-default configuration ensures safe deactivation of downstream power stages during input-side brownout or disconnection-required for ISO 26262 ASIL-B functional safety paths. |
| 50 kV/µs CMTI performance | Withstands rapid voltage transients across isolation barrier-maintains signal integrity in high-dV/dt environments like IGBT gate drivers and inverter DC-link monitoring. |
| AEC-Q100 Grade 1 qualification | Validated for automotive operation from –40 to +125 °C with zero-defect manufacturing flow-supports PPAP documentation and IMDS/CAMDS compliance for Tier 1 suppliers. |
Applications
| Motor Control Feedback | Isolated ADC Interface |
|---|---|
Use Scenario: Isolating encoder position signals and current-sense feedback from inverter stage to MCU in electric power steering or HVAC compressor drives. IC Role / Device Role / Timing Role: SI8651BB-AU transmits four PWM or quadrature signals (A1–A4) from isolated sensor domain to MCU domain while providing fail-safe low output on A5 for fault signaling. Use Value: 8 ns typical propagation delay ensures sub-microsecond timing alignment between phase current sampling and PWM edge generation-reducing torque ripple in field-oriented control. | Use Scenario: Connecting isolated sigma-delta ADC outputs (e.g., AD7403) to host processor in high-voltage battery pack monitoring systems. IC Role / Device Role / Timing Role: SI8651BB-AU routes four bitstream data lines from ADC's digital output side (VDD1) to processor's SPI interface (VDD2), with EN2 enabling synchronized data capture windows. Use Value: 150 Mbps capability supports oversampled 24-bit ADC bitstreams at >20 MSPS-enabling real-time cell voltage and temperature profiling with <1 µs latency. |
| Battery Management System (BMS) | Traction Inverter Gate Drive |
Use Scenario: Isolating cell monitoring IC (e.g., LTC6813) communication bus from main controller in 400–800 V EV battery packs. IC Role / Device Role / Timing Role: SI8651BB-AU carries four daisy-chain command signals (CS, SCLK, SDI) from controller to stack monitors, while A5 conveys fault status back with fail-safe low assertion. Use Value: 2.5 kVRMS QSOP-16 isolation meets IEC 61000-4-5 surge immunity requirements for Class 3B systems-eliminating need for external transient protection. | Use Scenario: Providing isolated gate drive enable/disable signals to SiC MOSFET half-bridge drivers in traction inverters. IC Role / Device Role / Timing Role: SI8651BB-AU delivers four independent gate enable signals (B1–B4) to upper/lower leg drivers, with EN1 controlling A5 as global fault shutdown line. Use Value: 50 kV/µs CMTI prevents false triggering during 10 kV/µs switching transients-ensuring reliable shoot-through prevention in 100 kHz+ switching topologies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8651BB-IS1 | Industrial-grade (–I suffix), same 4:1 channel count, 2.5 kVRMS, NB SOIC-16 package-lacks AEC-Q100 qualification and automotive process controls. | Targeted at industrial automation and medical equipment where automotive reliability and PPAP support are not required. | Select SI8651BB-IS1 for cost-sensitive non-automotive designs needing identical electrical specs but without automotive certification overhead. |
| ADUM141E0BRZ | Analog Devices quad-channel isolator with 150 Mbps, 10 ns propagation delay, and 3.75 kVRMS-but only 4 channels total, no 4:1 asymmetry, and no fail-safe low option. | Suitable for symmetric 4-channel isolation (e.g., isolated UART + GPIO), but cannot replicate SI8651BB-AU's dedicated A5 fault-signaling path. | Choose ADUM141E0BRZ when channel symmetry and higher isolation rating outweigh need for fail-safe signaling and automotive qualification. |
Compared with SI8651BB-IS1, the SI8651BB-AU adds AEC-Q100 qualification, AIAG-compliant PPAP, and automotive process controls-justifying its use in safety-critical vehicle subsystems. Versus ADUM141E0BRZ, it provides asymmetric 4:1 channel mapping and configurable fail-safe behavior essential for BMS fault propagation, albeit in a smaller QSOP footprint.
Availability
SI8651BB-AU is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and motor control applications requiring stable component supply, automotive-grade reliability, and long-term lifecycle support.
Supply support for SI8651BB-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 wireless, automotive, and industrial markets.
The Si865x family was designed specifically for high-reliability, low-power digital isolation in automotive and industrial systems-emphasizing AEC-Q100 qualification, extended temperature operation, and RF-based architecture for superior noise immunity and timing precision.
FAQ
What is the isolation rating and safety certification status of the SI8651BB-AU?
The SI8651BB-AU provides 2.5 kVRMS isolation for 1 minute and is certified to UL 1577, CSA Component Notice 5A, VDE 0884-10, and IEC 62368-1 (reinforced insulation). It meets automotive-grade requirements per AEC-Q100 Grade 1 and supports PPAP documentation for Tier 1 automotive supply chains.
How does the fail-safe low output mode function in the SI8651BB-AU during power loss?
When VDD1 is unpowered while VDD2 remains active, the SI8651BB-AU drives output A5 to logic low-its factory-configured fail-safe state. This behavior is defined by the "BB" ordering code and ensures safe deactivation of downstream circuits, such as gate drivers or relay controllers, during input-side brownout conditions.
Can the SI8651BB-AU operate with different supply voltages on each side?
Yes, the SI8651BB-AU supports independent 2.5–5.5 V supplies on VDD1 and VDD2 sides. This allows interfacing a 3.3 V microcontroller (VDD1) with a 5 V analog front-end or gate driver (VDD2) without external level shifters-maintaining full isolation integrity across both domains.
What is the maximum data rate supported by the SI8651BB-AU, and how is timing performance characterized?
The SI8651BB-AU supports up to 150 Mbps with 8.0 ns typical propagation delay (max 13 ns), 0.4 ns typical channel-to-channel skew (max 2.5 ns), and 5 ns minimum pulse width. These values are guaranteed over –40 to +125 °C and enable precise timing in high-speed motor control and isolated ADC interfaces.
Does the SI8651BB-AU require external components for stable operation?
Yes, the SI8651BB-AU requires a 0.1 µF ceramic bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2-placed as close as possible to the respective pins. No pull-up/down resistors are needed due to integrated Schmitt triggers and fail-safe configuration, but EN1/EN2 should be externally tied if unused in noisy environments.
SI8651BB-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
SI8651BB-AU FAQ
1.How can I place an order for SI8651BB-AU through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8651BB-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 SI8651BB-AU reliable?
The price and inventory of SI8651BB-AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8651BB-AU is usually 5 days.
3.What payment methods are accepted for SI8651BB-AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8651BB-AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8651BB-AU?
SI8651BB-AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8651BB-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 SI8651BB-AU?
For technical support, including SI8651BB-AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8651BB-AU requirements.
6.How does Aetrix verify that SI8651BB-AU is sourced from the original manufacturer or authorized distributors?
All SI8651BB-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 SI8651BB-AU meets industry standards.
7.What is the process for return or replacement of SI8651BB-AU?
All SI8651BB-AU units undergo pre-shipment inspection (PSI). If there is an issue with SI8651BB-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 SI8651BB-AU part is unused and in its original packaging.
Return procedure for SI8651BB-AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8651BB-AU 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
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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