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Skyworks Solutions Inc. SI8651BD-B-ISR
- Part No.:
- SI8651BD-B-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8651BD-B-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 5CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,443
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Product details
Overview
SI8651BD-B-ISR 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 5 kVRMS reinforced isolation in wide-body SOIC-16 package. 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 fail-safe low-default output state during power loss - used in isolated motor control gate drivers and battery management system signal interfaces.
For engineers reviewing the SI8651BD-B-ISR datasheet, SI8651BD-B-ISR pinout, SI8651BD-B-ISR application, or SI8651BD-B-ISR equivalent, key selection criteria include its 5 kVRMS isolation rating, 4:1 channel asymmetry, wide 2.5–5.5 V dual-supply operation, AEC-Q100 qualification (industrial-grade variant), and compatibility with high-noise industrial bus and power-conversion timing interfaces.
Technical Context
The SI8651BD-B-ISR implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture delivers precise timing with ≤2 ns propagation delay skew and ≤0.5 ns channel-channel skew across temperature.
It integrates independent undervoltage lockout (UVLO) monitors per side (VDD1/VDD2), supports fail-safe default-L output via ordering option, and uses internal 2 µA pull-ups on EN pins - enabling flexible enable-controlled tri-state output behavior for multiplexed or clock-synchronized data routing in isolated microcontroller-peripheral links.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation - meets UL, VDE, CQC, and CSA safety standards for high-voltage system separation. |
| Channel Configuration | 4-input / 1-output asymmetry - enables bidirectional signal routing across isolation barrier with dedicated control-side inputs and isolated-side output. |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces including isolated SPI, RS-485 transceiver control, and real-time ADC sampling clocks. |
| Propagation Delay | 5–13 ns (typ. 8 ns) - ensures sub-10 ns timing accuracy critical for gate driver dead-time control and fast-loop feedback paths. |
| Supply Voltage Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V MCU I/O and 5 V analog/power domains without level-shifting. |
| Fail-Safe Default | Low-output during VDD1 loss - prevents unintended activation of downstream power switches or actuators in fault conditions. |
| CMTI | ≥50 kV/µs - maintains signal integrity in high-dV/dt environments such as motor drives and inverters. |
Pinout & Package
SI8651BD-B-ISR is housed in a RoHS-compliant 16-pin wide-body SOIC package (WB SOIC-16) with 8.3 mm creepage/clearance, supporting reinforced insulation up to 5 kVRMS. Pin spacing and body width comply with JEDEC MS-013AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to input-side logic and RF transmitter; requires local 0.1 µF bypass capacitor. |
| GND1 | Input-side ground reference | Reference for all input signals and VDD1; must be separated from GND2 by isolation barrier. |
| INA1–INA4 | Input data channels | Four Schmitt-trigger digital inputs accepting 2.0–5.5 V logic; tolerant of slow edges and EMI. |
| EN1 | Enable control for A5 output | Active-high enable for isolated-side output A5; internally pulled up to VDD1; drives A5 into Hi-Z when low. |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to output-side logic and RF receiver; requires local 0.1 µF bypass capacitor. |
| GND2 | Output-side ground reference | Reference for all output signals and VDD2; galvanically isolated from GND1. |
| A5 | Isolated output channel | Single CMOS output driven by input-side INA1–INA4 logic; defaults low during VDD1 loss; tri-state capable. |
| EN2 | No-connect (NC) | Not internally connected; may be left floating, tied to VDD2, or grounded - no functional impact. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; enables stable 60-year lifetime at rated working voltage. |
| Selectably fail-safe output | Factory-configured low-default state ensures safe deactivation of downstream power stages during input-side brownout. |
| Tri-state output with EN1 | Allows dynamic bus sharing and reduces contention in multi-master isolated communication topologies. |
| High CMTI (≥50 kV/µs) | Prevents data corruption in motor drive inverters where common-mode transients exceed 1 kV/ns. |
| Wide-temp operation (–40 to +125 °C) | Validated performance across full automotive and industrial ambient ranges without derating. |
Applications
| Motor Drive Control Interface | Isolated Battery Management System |
|---|---|
Use Scenario: Isolating PWM gate signals and fault feedback between MCU and IGBT/SiC half-bridge drivers in EV traction inverters. IC Role / Device Role / Timing Role: SI8651BD-B-ISR transmits four independent control signals (e.g., upper/lower gate enables, reset, enable) while providing single isolated fault-reporting channel (A5) back to MCU. Use Value: 5 kVRMS rating withstands bus voltages >800 VDC; <10 ns propagation delay enables precise dead-time control; fail-safe low default prevents shoot-through during MCU reset. | Use Scenario: Isolating cell voltage monitoring and balancing command signals between BMS controller and high-side analog front-end in 400–800 V battery packs. IC Role / Device Role / Timing Role: SI8651BD-B-ISR carries four analog-to-digital interface control lines (e.g., CS, SCLK, MOSI, MISO enable) and returns one isolated ready/busy status (A5) from isolated ADC. Use Value: 150 Mbps capability supports fast SPI bursts; Schmitt inputs reject noise from adjacent high-current cell balancing circuits; 125 °C rating matches pack thermal environment. |
| Industrial PLC Digital I/O Module | Isolated Switch-Mode Power Supply Feedback |
Use Scenario: Providing galvanic isolation between field-side 24 V digital inputs and 3.3 V controller logic in programmable logic controllers. IC Role / Device Role / Timing Role: SI8651BD-B-ISR accepts four 24 V field inputs (via external resistive dividers) and drives one isolated status LED or relay enable (A5) on the controller side. Use Value: Input hysteresis (0.44 V typ.) rejects line transients; wide 2.5–5.5 V supply range accommodates both 3.3 V and 5 V controller rails; AEC-Q100-qualified reliability supports long-life deployments. | Use Scenario: Isolating error amplifier output and mode-select signals between primary-side controller and secondary-side optocoupler replacement circuit in 1–3 kW telecom PSUs. IC Role / Device Role / Timing Role: SI8651BD-B-ISR transmits four control bits (e.g., overvoltage/overcurrent flags, soft-start, burst mode) and returns one isolated power-good signal (A5) to primary controller. Use Value: 50 kV/µs CMTI prevents false triggering from transformer leakage spikes; low 1.5 mA/channel @ 1 Mbps minimizes standby power; 5 kVRMS rating satisfies IEC 62368-1 reinforced insulation requirements. |
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, 3.75 kVRMS, narrow-body SOIC-16, no fail-safe default option | Lacks configurable fail-safe output; lower isolation rating limits use in >600 V systems | Choose when cost sensitivity outweighs need for 5 kVRMS or fail-safe behavior. |
| ISO6741FDWR | 4-channel, 50 Mbps, 5 kVRMS, wide-body SOIC-16, failsafe-L default, but no EN pin for tri-state | Lower data rate restricts SPI/UART use; lacks enable-controlled tri-state output | Choose only for low-speed control signaling where tri-state bus sharing is unnecessary. |
Compared with ADUM141E0BRZ and ISO6741FDWR, SI8651BD-B-ISR uniquely combines 5 kVRMS reinforced isolation, 150 Mbps speed, 4:1 asymmetric channel count, and factory-configurable fail-safe-L output - making it optimal for high-reliability, high-voltage industrial and automotive signal isolation where timing precision and fault resilience are critical.
Availability
SI8651BD-B-ISR is available at Aetrix Electronics and suitable for industrial automation systems, battery management systems, and isolated switch-mode supplies requiring stable component supply, long-term lifecycle support, and certified 5 kVRMS isolation.
Supply support for SI8651BD-B-ISR 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 industrial and automotive signal isolation, emphasizing ultra-low power, precise timing, and safety-certified reinforced insulation in compact packages.
FAQ
What is the isolation voltage rating of SI8651BD-B-ISR and which safety standards does it meet?
The SI8651BD-B-ISR is rated for 5 kVRMS reinforced isolation and is certified to UL 1577, VDE 0884-10, CSA Component Notice 5A, and CQC GB4943.1 standards. This enables its use in high-voltage applications such as EV traction inverters and industrial motor drives where reinforced insulation is mandated by IEC 61800-5-1 and IEC 62368-1.
Does SI8651BD-B-ISR require startup initialization or configuration before operation?
No, SI8651BD-B-ISR requires no startup initialization or configuration. Its RF-based isolation architecture begins transmitting valid data within 40 µs of VDD1/VDD2 stabilization, with outputs following input states after UVLO release - simplifying firmware design and eliminating boot-time uncertainty in safety-critical systems.
How does the fail-safe default output function in SI8651BD-B-ISR?
The SI8651BD-B-ISR is factory-configured for low-default output (L) during VDD1 loss. When the input-side supply drops below UVLO threshold, A5 transitions to logic low within 1 µs if VDD2 remains powered - ensuring fail-safe shutdown of downstream power devices like gate drivers or relays without external circuitry.
What is the purpose of the EN1 pin on SI8651BD-B-ISR and how should it be used?
The EN1 pin controls tri-state behavior of the A5 output: when high or unconnected (internally pulled up), A5 follows INA1–INA4 logic; when low, A5 enters high-impedance state. This enables dynamic bus sharing in multi-isolator configurations and eliminates contention during system reset or sleep modes in the SI8651BD-B-ISR application.
Can SI8651BD-B-ISR operate with different supply voltages on each side?
Yes, SI8651BD-B-ISR supports independent 2.5–5.5 V supplies on VDD1 and VDD2 sides. This allows direct interfacing between 3.3 V microcontrollers and 5 V analog/power domains - for example, connecting an ARM Cortex-M4 (3.3 V I/O) to a 5 V isolated ADC or gate driver, without external level shifters in the SI8651BD-B-ISR signal path.
SI8651BD-B-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm 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:
- 5000Vrms
- 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:
- 2.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8651BD-B-ISR FAQ
1.How can I place an order for SI8651BD-B-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8651BD-B-ISR 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 SI8651BD-B-ISR reliable?
The price and inventory of SI8651BD-B-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8651BD-B-ISR is usually 5 days.
3.What payment methods are accepted for SI8651BD-B-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8651BD-B-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8651BD-B-ISR?
SI8651BD-B-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8651BD-B-ISR 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 SI8651BD-B-ISR?
For technical support, including SI8651BD-B-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8651BD-B-ISR requirements.
6.How does Aetrix verify that SI8651BD-B-ISR is sourced from the original manufacturer or authorized distributors?
All SI8651BD-B-ISR 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 SI8651BD-B-ISR meets industry standards.
7.What is the process for return or replacement of SI8651BD-B-ISR?
All SI8651BD-B-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8651BD-B-ISR, 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 SI8651BD-B-ISR part is unused and in its original packaging.
Return procedure for SI8651BD-B-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8651BD-B-ISR 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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