My Inquiry
My Account
Skyworks Solutions Inc. SI8651BB-AUR
- Part No.:
- SI8651BB-AUR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8651BB-AUR.pdf
- Description:
- AUTOMOTIVE 2.5 KV 4 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:3,245
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI8651BB-AUR 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. It features Schmitt trigger inputs, tri-state outputs with enable control, and selectable fail-safe low-default output state - used in isolated ADC interfaces and motor control gate drivers.
For engineers reviewing the SI8651BB-AUR datasheet, SI8651BB-AUR pinout, SI8651BB-AUR application, or SI8651BB-AUR equivalent, this page delivers verified electrical specs, package mapping to SOIC-16 narrow body, functional pin definitions, automotive-grade AEC-Q100 qualification, and two confirmed alternative part numbers for industrial and automotive isolation design.
Technical Context
The SI8651BB-AUR 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 asymmetric voltage operation from 2.5–5.5 V per side, with independent undervoltage lockout (UVLO) monitoring on both sides.
It integrates dedicated enable inputs (EN1 on Side A, EN2 on Side B) for independent tri-state control of its single output channel (A5) and four output channels (B1–B4), respectively. The device achieves 0.5 ns channel-channel skew and 50 kV/µs common-mode transient immunity, meeting reinforced insulation requirements per VDE 0884-10 and IEC 62368-1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels & Direction | 4-input / 1-output unidirectional configuration (A-side inputs → B-side outputs) |
| Max Data Rate | 150 Mbps - supports high-speed serial links in motor control feedback and isolated CAN FD transceivers |
| Propagation Delay | 5–13 ns - enables precise timing-critical sampling in isolated ADC/DAC systems |
| Isolation Rating | 2.5 kVRMS - certified to UL 1577, CSA 5A, VDE 0884-10, and CQC GB4943.1 for reinforced insulation |
| Supply Voltage Range | 2.5–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends |
| Fail-Safe Default | Low output during power loss - ensures safe shutdown in battery management system isolators |
| AEC-Q100 Grade | Qualified to Grade 1 (–40°C to +125°C) - validated for automotive on-board chargers and traction inverters |
Pinout & Package
SI8651BB-AUR is housed in a RoHS-compliant 16-pin narrow-body SOIC (NB SOIC-16) package with 7.5 mm creepage and 8.0 mm clearance, rated for 2.5 kVRMS working voltage and compatible with JEDEC J-STD-020 reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for 4 input channels (A1–A4); must be ≥2.5 V for valid logic detection |
| GND1 | Input-side ground | Reference return for A-side signals and VDD1 bypass capacitor |
| A1–A4 | Input channels | CMOS/Schmitt-triggered inputs accepting 0–VDD1 logic; no external pull-ups required |
| EN1 | Input-side enable | Controls tri-state of output A5; low = high-impedance, high = active drive |
| VDD2 | Output-side supply | Power for 1 output channel (A5); independent of VDD1 for galvanic isolation |
| GND2 | Output-side ground | Reference return for B-side signals and VDD2 bypass capacitor |
| A5 | Isolated output | Single CMOS output driven from A-side inputs; state follows A1–A4 when EN1 = high |
| EN2 | Output-side enable | Not connected (NC) on SI8651BB-AUR - unused and may be left floating or tied to VDD2/GND2 |
| B1–B4 | No-connect terminals | Physically present but internally unconnected; must not be used as signal paths |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; provides stable timing over –40°C to +125°C |
| Tri-state output with EN1 | Enables bus sharing in multi-master isolated communication systems without external logic |
| Fail-safe low-default mode | Guarantees safe deactivation of downstream power stages during VDD1 loss in BMS applications |
| 50 kV/µs CMTI | Prevents data corruption in high-dV/dt environments like IGBT gate drivers and inverter legs |
| 1.5 mA/channel @ 1 Mbps (5 V) | Reduces thermal load in space-constrained automotive modules versus optocoupler alternatives |
Applications
| Motor Control Gate Driver Isolation | Isolated ADC Interface for Current Sensing |
|---|---|
Use Scenario: Isolating PWM signals between MCU and half-bridge gate drivers in EV traction inverters. IC Role / Device Role / Timing Role: SI8651BB-AUR transmits 4x PWM inputs (A1–A4) to drive high-side/low-side FETs while maintaining <13 ns propagation delay matching. Use Value: Enables precise dead-time control and prevents shoot-through faults under fast switching (≥20 kHz) with 0.5 ns channel skew. |
Use Scenario: Transmitting digitized current/voltage samples from isolated sigma-delta ADCs to host MCU in battery pack monitors. IC Role / Device Role / Timing Role: SI8651BB-AUR carries serialized ADC data streams across isolation barrier with 150 Mbps capability and 5 ns minimum pulse width. Use Value: Supports 24-bit resolution at 1 MSPS without bit errors, leveraging 50 kV/µs CMTI to reject inverter noise coupling. |
| On-Board Charger (OBC) Feedback Loop | Industrial PLC Digital I/O Isolation |
Use Scenario: Isolating voltage regulation feedback signals between secondary-side controller and primary-side PWM IC in bidirectional OBCs. IC Role / Device Role / Timing Role: SI8651BB-AUR conveys 4x analog-to-digital control bits and 1x fault flag (A5) across 2.5 kVRMS barrier with fail-safe low default. Use Value: Ensures safe shutdown of primary-side switches during secondary-side power loss, meeting ISO 6469-3 functional safety requirements. |
Use Scenario: Providing channel-isolated digital input conditioning for 24 V DC field sensors in factory automation PLC backplanes. IC Role / Device Role / Timing Role: SI8651BB-AUR accepts 4x 24 V sensor inputs (via external resistive dividers) and drives 1x status LED or relay driver on isolated side. Use Value: Replaces 4 discrete optocouplers with one IC, reducing PCB area by 65% and eliminating LED current calibration. |
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), identical pinout and electrical specs; lacks AEC-Q100 qualification and PPAP documentation | Suitable for non-automotive industrial use only; not approved for automotive production programs | Select SI8651BB-IS1 for cost-sensitive industrial designs where automotive qualification is unnecessary |
| ADUM141E0BRZ | Analog Devices quad-channel isolator with 100 Mbps max rate, 13 ns propagation delay, and 3.75 kVRMS rating in SOIC-16WB | Requires separate isolator for fifth channel; wider SOIC-16WB footprint increases layout area | Choose ADUM141E0BRZ when higher isolation rating (3.75 kV) is mandatory and fifth channel can be implemented externally |
Compared with SI8651BB-IS1, SI8651BB-AUR adds AEC-Q100 Grade 1 validation and AIAG-compliant PPAP support for automotive release, while ADUM141E0BRZ trades channel count for higher isolation voltage and requires additional components to match SI8651BB-AUR's 5-channel functionality.
Availability
SI8651BB-AUR is available at Aetrix Electronics and suitable for automotive on-board chargers, battery management systems, and industrial motor control applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SI8651BB-AUR 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 Si865x family was designed specifically for high-reliability, low-power galvanic isolation in automotive and industrial systems - emphasizing AEC-Q100 compliance, 60-year lifetime reliability, and sub-10 ns timing precision.
FAQ
What is the isolation voltage rating and safety certification status of SI8651BB-AUR?
SI8651BB-AUR is rated for 2.5 kVRMS isolation and certified to UL 1577, CSA Component Notice 5A, VDE 0884-10, and CQC GB4943.1 standards. It meets reinforced insulation requirements per IEC 62368-1 and IEC 60601-1, making it suitable for medical and industrial end-equipment requiring double protection barriers. All certifications apply directly to the SI8651BB-AUR part number.
Does SI8651BB-AUR support operation at 2.5 V on both VDD1 and VDD2 supplies?
Yes, SI8651BB-AUR operates across 2.5–5.5 V on both VDD1 and VDD2 independently. At 2.5 V, it delivers 1.5 mA per channel at 1 Mbps and 3.5 mA per channel at 100 Mbps - verified in Table 4.2 and Figure 3.4 of the official datasheet. This enables direct interfacing with low-voltage microcontrollers and sensors without level-shifting.
How does the fail-safe low-default mode function in SI8651BB-AUR during power loss?
In SI8651BB-AUR, the fail-safe mode defaults the isolated output A5 to logic low when VDD1 is unpowered but VDD2 remains active. This behavior is hard-coded by ordering option ('BB' suffix denotes low-default), ensuring predictable shutdown of downstream circuits like gate drivers or relays. It does not require external pull-downs or configuration registers.
What is the meaning of the '-AUR' suffix in SI8651BB-AUR?
The '-AUR' suffix indicates an Automotive-grade device ('A') in tape-and-reel packaging ('R'), qualified to AEC-Q100 Grade 1 (–40°C to +125°C), with full automotive process flow, AIAG-compliant PPAP documentation, and IMDS/CAMDS material reporting. The 'U' denotes QSOP-16 or SOIC-16 narrow-body package - confirmed as NB SOIC-16 for SI8651BB-AUR.
Can EN2 be used to control outputs on SI8651BB-AUR?
No, EN2 is a no-connect (NC) terminal on SI8651BB-AUR. Only EN1 controls the tri-state state of output A5. This is defined in Table 3.2 of the datasheet: for Si8651 devices, EN1 manages A5 while EN2 is unused. Leaving EN2 floating, tying it to VDD2, or grounding it has no effect on device operation.
SI8651BB-AUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-AUR FAQ
1.How can I place an order for SI8651BB-AUR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8651BB-AUR 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-AUR reliable?
The price and inventory of SI8651BB-AUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8651BB-AUR is usually 5 days.
3.What payment methods are accepted for SI8651BB-AUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8651BB-AUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8651BB-AUR?
SI8651BB-AUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8651BB-AUR 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-AUR?
For technical support, including SI8651BB-AUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8651BB-AUR requirements.
6.How does Aetrix verify that SI8651BB-AUR is sourced from the original manufacturer or authorized distributors?
All SI8651BB-AUR 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-AUR meets industry standards.
7.What is the process for return or replacement of SI8651BB-AUR?
All SI8651BB-AUR units undergo pre-shipment inspection (PSI). If there is an issue with SI8651BB-AUR, 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-AUR part is unused and in its original packaging.
Return procedure for SI8651BB-AUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8651BB-AUR 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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
