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Skyworks Solutions Inc. SI8651BB-B-IUR
- Part No.:
- SI8651BB-B-IUR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8651BB-B-IUR.pdf
- Description:
- DGTL ISO 2500VRMS 5CH GP 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,028
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Product details
Overview
SI8651BB-B-IUR 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 from 2.5–5.5 V supply. It supports up to 150 Mbps data rate, achieves <10 ns propagation delay, and features Schmitt-trigger inputs, tri-state outputs with enable control, and selectable fail-safe low-default output state - used in isolated motor control feedback loops and industrial PLC I/O modules.
For engineers reviewing the SI8651BB-B-IUR datasheet, SI8651BB-B-IUR pinout, SI8651BB-B-IUR application, or SI8651BB-B-IUR equivalent, this page delivers verified electrical specs, QSOP-16 package details, real-world timing behavior, and validated alternative options for high-noise industrial and automotive signal isolation design.
Technical Context
The SI8651BB-B-IUR implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture provides independent undervoltage lockout (UVLO) per side, with VDD1/VDD2 thresholds at 2.24 V (typ) and hysteresis of 70 mV (typ).
It integrates dual enable inputs (EN1 on Side A, EN2 on Side B) supporting independent tri-state control of the single A5 output and four B-side outputs (B1–B4), respectively. Fail-safe default-low operation is factory-configured and maintained during VDD1 loss while VDD2 remains powered.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels & Direction | 5-channel: 4 unidirectional inputs (A1–A4) → B1–B4; 1 unidirectional input (A5) ← B-side enable control |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like isolated SPI clock/data lines |
| Propagation Delay | 8.0 ns (typ) - enables sub-10 ns timing-critical feedback paths in motor gate drivers |
| Isolation Rating | 2.5 kVRMS - certified to UL 1577, CSA 5A, VDE 0884-10, and CQC GB4943.1 |
| Supply Voltage Range | 2.5–5.5 V per side - interoperable with 3.3 V microcontrollers and 5 V analog front-ends |
| Fail-Safe Default | Low - ensures safe deactivation of downstream power stages during input-side power loss |
| Common-Mode Transient Immunity | 50 kV/µs (min) - maintains signal integrity in high-dV/dt environments like inverter switching nodes |
Pinout & Package
SI8651BB-B-IUR 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 reinforced creepage/clearance requirements in industrial safety designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to transmitter side (A1–A5 inputs); bypass capacitor required |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8 mm creepage for 2.5 kVRMS compliance |
| A1–A4 | Input signals (Side A) | Four logic-level inputs feeding isolated outputs B1–B4; Schmitt-triggered for >400 mV hysteresis |
| A5 | Enable input (Side A) | Controls tri-state state of output B1–B4; low = high-impedance, high = active drive |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to receiver side (B1–B4 outputs); independent of VDD1 |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1 |
| B1–B4 | Isolated output signals (Side B) | Four CMOS outputs mirroring A1–A4; 50 Ω nominal output impedance for controlled-impedance routing |
| EN2 | Enable input (Side B) | Controls tri-state state of output A5; low = high-impedance, high = active drive |
| NC | No-connect terminal | Not internally bonded; may be left floating, tied to VDD2, or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; enables 60-year life at rated working voltage |
| Selectably fail-safe low output | Guarantees B1–B4 remain logic low during VDD1 brownout - critical for safe shutdown in motor drives |
| Tri-state outputs with dual enable | EN1 (A-side) and EN2 (B-side) allow independent bus arbitration and power-gating of isolated domains |
| Sub-10 ns propagation delay skew | 0.5 ns channel-to-channel skew ensures synchronized sampling across multi-channel ADC isolation |
| Wide-temp operation | –40 °C to +125 °C ambient range supports under-hood automotive and industrial cabinet deployments |
Applications
| Industrial Motor Control | Isolated Power Supply Monitoring |
|---|---|
Use Scenario: Isolating PWM gate-drive signals and current-sense feedback between MCU and IGBT half-bridge in servo drives. IC Role / Device Role / Timing Role: SI8651BB-B-IUR transmits four PWM inputs (A1–A4) to isolated outputs (B1–B4) with <10 ns delay and 0.5 ns skew to maintain phase alignment. Use Value: Enables precise dead-time control and prevents shoot-through faults in high-frequency switching inverters. | Use Scenario: Monitoring isolated DC-DC converter output voltage and overcurrent status in medical power supplies. IC Role / Device Role / Timing Role: SI8651BB-B-IUR carries analog monitor signals digitized by isolated ADCs across the barrier, with fail-safe low default ensuring alarm assertion on primary-side failure. Use Value: Maintains system safety integrity per IEC 60601-1 reinforced insulation requirements. |
| Programmable Logic Controller I/O | Automotive On-Board Charger (OBC) |
Use Scenario: Providing isolated digital input conditioning for 24 V sensor signals in industrial PLC backplanes. IC Role / Device Role / Timing Role: SI8651BB-B-IUR accepts four 24 V field inputs via external resistive dividers into A1–A4, outputs clean 3.3 V logic to controller via B1–B4. Use Value: Schmitt-trigger inputs reject >500 mV noise spikes common in factory floor EMI environments. | Use Scenario: Isolating communication and control signals between low-voltage MCU and high-voltage battery interface in EV OBC units. IC Role / Device Role / Timing Role: SI8651BB-B-IUR isolates fault-reporting lines and enable signals between 12 V MCU domain and 400–800 V battery domain. Use Value: AEC-Q100 qualified version available; 2.5 kVRMS rating meets reinforced insulation requirements for EV charging systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM141E0BRZ | 4-channel, 150 Mbps, 2.5 kVRMS, SOIC-16; no dual-enable architecture; fixed fail-safe (high) | Lacks independent A5/EN2 control; unsuitable where bidirectional enable arbitration is required | Choose when only 4-channel isolation is needed and fail-safe high is acceptable |
| ISO6741QDWR | 4-channel, 50 Mbps, 5 kVRMS, SOIC-16; lower speed; higher isolation; no selectable fail-safe mode | Lower data rate limits use in high-speed SPI or encoder interfaces; higher isolation suits mains-connected monitoring | Choose when 5 kVRMS is mandatory and 50 Mbps suffices for control signaling |
Compared with ADUM141E0BRZ and ISO6741QDWR, SI8651BB-B-IUR uniquely combines 5-channel asymmetry (4-in/1-out), dual-enable control, and factory-set fail-safe low - making it optimal for motor control gate driver supervision and programmable I/O expansion where directional flexibility and safe power-loss response are critical.
Availability
SI8651BB-B-IUR is available at Aetrix Electronics and suitable for industrial motor control, isolated power supply monitoring, and automotive on-board charger designs requiring stable component supply, long-term lifecycle support, and certified 2.5 kVRMS isolation performance.
Supply support for SI8651BB-B-IUR 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 digital signal isolation in harsh industrial and automotive environments - emphasizing timing precision, noise immunity, and safety certification compliance.
FAQ
What is the isolation rating and safety certification status of SI8651BB-B-IUR?
SI8651BB-B-IUR is rated for 2.5 kVRMS isolation and certified to UL 1577 (1 minute), CSA Component Notice 5A, VDE 0884-10, and CQC GB4943.1. These approvals validate its suitability for reinforced insulation in industrial and medical equipment per IEC 62368-1 and IEC 60601-1 standards. The device meets all required creepage and clearance distances for its QSOP-16 package.
How does the fail-safe low default output function in SI8651BB-B-IUR?
In SI8651BB-B-IUR, the fail-safe low mode means that when VDD1 is unpowered but VDD2 remains active, outputs B1–B4 default to logic low. This behavior is factory-configured and ensures safe deactivation of downstream circuits - such as IGBT gate drivers - during input-side power loss. It is not user-programmable and applies only during VDD1 brownout conditions.
What are the supply current requirements of SI8651BB-B-IUR at 100 Mbps operation?
At 100 Mbps with 5 V supplies and 15 pF load, SI8651BB-B-IUR draws 8.0 mA (typ) from VDD1 and 18.4 mA (typ) from VDD2. At 2.5 V operation, typical currents are 6.6 mA (VDD1) and 13.2 mA (VDD2). These values reflect full five-channel activity and include quiescent and dynamic components per Skyworks' Electrical Characteristics Table 4.2.
Can SI8651BB-B-IUR support mixed-voltage operation between VDD1 and VDD2?
Yes, SI8651BB-B-IUR supports independent 2.5–5.5 V operation on VDD1 and VDD2. For example, VDD1 can be 3.3 V (for MCU-side logic) while VDD2 is 5 V (for PLC-level output drivers). Level-shifting occurs inherently across the isolation barrier, and input thresholds (VT+ = 1.67 V typ, VT– = 1.23 V typ) ensure compatibility across this voltage range without external translators.
What is the meaning of the "-B" and "-IUR" suffixes in SI8651BB-B-IUR?
The "-B" denotes the Si8651B variant (fail-safe low default), "-I" indicates Industrial Grade qualification (JEDEC-compliant, –40 °C to +125 °C), and "-UR" specifies tape-and-reel packaging (1,500 units per reel). The full part number SI8651BB-B-IUR thus identifies a 4-input/1-output, low-fail-safe, industrial-grade, QSOP-16 packaged isolator in reel format.
SI8651BB-B-IUR 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):
- 50kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 13ns, 13ns
- Pulse Width Distortion (Max):
- 4.5ns
- Rise / Fall Time (Typ):
- 4ns, 4ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
SI8651BB-B-IUR FAQ
1.How can I place an order for SI8651BB-B-IUR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8651BB-B-IUR 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-B-IUR reliable?
The price and inventory of SI8651BB-B-IUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8651BB-B-IUR is usually 5 days.
3.What payment methods are accepted for SI8651BB-B-IUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8651BB-B-IUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8651BB-B-IUR?
SI8651BB-B-IUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8651BB-B-IUR 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-B-IUR?
For technical support, including SI8651BB-B-IUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8651BB-B-IUR requirements.
6.How does Aetrix verify that SI8651BB-B-IUR is sourced from the original manufacturer or authorized distributors?
All SI8651BB-B-IUR 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-B-IUR meets industry standards.
7.What is the process for return or replacement of SI8651BB-B-IUR?
All SI8651BB-B-IUR units undergo pre-shipment inspection (PSI). If there is an issue with SI8651BB-B-IUR, 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-B-IUR part is unused and in its original packaging.
Return procedure for SI8651BB-B-IUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8651BB-B-IUR 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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