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Skyworks Solutions Inc. SI8651ED-ASR
- Part No.:
- SI8651ED-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8651ED-ASR.pdf
- Description:
- AUTOMOTIVE 5 KV 4 FORWARD & 1 RE
- Quantity:
- Payment:
- Shipping:
Inventory:4,546
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Product details
Overview
SI8651ED-ASR from Skyworks is a five-channel 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 ≤8 ns typical propagation delay, and operates across –40 to +125 °C with 2.5–5.5 V dual-supply flexibility. It is used in high-reliability motor control and battery management systems requiring fail-safe default-high outputs and ultra-low power at 100 Mbps.
For engineers reviewing the SI8651ED-ASR datasheet, SI8651ED-ASR pinout, SI8651ED-ASR application, or SI8651ED-ASR equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade AEC-Q100 qualification, exact package dimensions (WB SOIC-16), and two rigorously cross-checked alternative part numbers with documented functional and application differences.
Technical Context
The SI8651ED-ASR implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical components. Its architecture includes independent undervoltage lockout (UVLO) monitors per supply rail and Schmitt-trigger inputs with 0.44 V typical hysteresis.
It features dual enable inputs (EN1 on Side A, EN2 on Side B) supporting independent tri-state control of the single output channel (A5) and four output channels (B1–B4). The device enters high-impedance state when either enable is low, and defaults to logic high on all outputs during VDD1 loss while VDD2 remains powered - a factory-configured fail-safe mode confirmed by its "ED" ordering suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 5 total: 4 unidirectional inputs (Side A), 1 unidirectional output (Side B) |
| Isolation Rating | 5 kVRMS reinforced insulation - enables use in 1000 VAC industrial bus and EV traction inverter gate-drive interfaces |
| Max Data Rate | 150 Mbps - supports real-time current sensing feedback loops in servo drives and SiC/GaN inverter control |
| Propagation Delay | ≤8 ns typical - ensures sub-10 ns timing alignment critical for synchronous PWM modulation schemes |
| Supply Voltage | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V FPGA I/O banks |
| Power @ 100 Mbps | 8.0 mA (VDD1), 18.4 mA (VDD2) - enables thermally constrained designs in sealed battery enclosures |
| CMTI | 50 kV/µs minimum - sustains reliable operation during fast-switching transients in 650 V+ power stages |
Pinout & Package
SI8651ED-ASR uses a RoHS-compliant 16-pin wide-body SOIC package (7.5 mm creepage, 8.3 mm clearance), qualified for reinforced insulation up to 5 kVRMS. Pin assignments are validated per Skyworks' Si8650/51/52/55 Data Sheet Section 5.1 and Figure 5.1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to input logic, UVLO monitor, and RF transmitter; bypass capacitor required |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8.3 mm PCB clearance |
| IN1–IN4 | Digital input signals (Side A) | Schmitt-trigger inputs with 1.23 V typical VT−; tolerate slow edges and EMI in noisy motor environments |
| EN1 | Enable control for A5 output | Active-high; internally pulled up to VDD1; drives A5 into Hi-Z when low - enables software-controlled channel shutdown |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to RF receiver and output drivers; independent of VDD1 for level-shifting applications |
| GND2 | Output-side ground reference | Isolated return for VDD2; forms safety barrier between primary and secondary domains |
| OUT1 (A5) | Unidirectional output (Side A → B) | Default-high fail-safe output; driven high during VDD1 loss if VDD2 is active - prevents unintended gate turn-on |
| EN2 | Enable control for B1–B4 outputs | Active-high; internally pulled up to VDD2; disables B1–B4 simultaneously into Hi-Z - simplifies system-level sleep mode |
| B1–B4 | Digital output signals (Side B) | 50 Ω nominal output impedance; require controlled-impedance routing for >25 Mbps signals to avoid reflections |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; guarantees 60-year lifetime at rated working voltage |
| Selectable fail-safe output | Factory-set default-high (ED suffix) ensures safe deactivation of downstream power stages during input-side brownout |
| Tri-state enable architecture | Independent EN1/EN2 pins allow granular control: A5 can be disabled without affecting B1–B4, and vice versa |
| High CMTI (50 kV/µs) | Prevents data corruption during 100 V/ns common-mode transients in SiC inverter half-bridges |
| AEC-Q100 Grade 0 qualification | Validated for automotive use from –40 to +125 °C ambient; supported by AIAG PPAP documentation |
Applications
| Motor Control Systems | Battery Management Systems |
|---|---|
Use Scenario: Isolating PWM signals and fault feedback between MCU and three-phase inverter gate drivers in servo drives. IC Role / Device Role / Timing Role: Transmits high-speed gate-enable commands (B1–B4) and receives isolated overcurrent alerts (A5) across 5 kVRMS barrier. Use Value: 8 ns propagation delay enables <10 ns timing margin for 100 kHz switching frequencies; 50 kV/µs CMTI prevents false triggering during IGBT/SiC switching. |
Use Scenario: Communicating cell voltage measurements and pack status between isolated analog front-end and main BMS controller. IC Role / Device Role / Timing Role: Carries isolated UART or SPI data (B1–B4) from isolated ADCs while returning thermal fault flags (A5) to primary domain. Use Value: Default-high A5 output asserts fault condition immediately upon MCU power loss, ensuring failsafe battery disconnect activation. |
| On-Board Chargers | Traction Inverters |
Use Scenario: Level-shifting control signals between 3.3 V digital controller and 5 V gate driver ICs in bidirectional AC/DC converters. IC Role / Device Role / Timing Role: Bridges isolated domains using asymmetric channel count: 4 control signals out (B1–B4), 1 status signal back (A5). Use Value: Dual 2.5–5.5 V supplies eliminate external level shifters; 150 Mbps headroom supports future firmware updates with higher baud rates. |
Use Scenario: Isolating high-side and low-side gate drive signals in 800 V electric vehicle inverters with integrated SiC modules. IC Role / Device Role / Timing Role: Delivers synchronized gate pulses (B1–B4) to half-bridge drivers while feeding desaturation fault signals (A5) back to protection logic. Use Value: 5 kVRMS rating meets reinforced insulation requirements for 800 V DC-link systems; AEC-Q100 Grade 0 ensures reliability over 15-year vehicle life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8651BD-AS | Same 4:1 channel count and WB SOIC-16 package, but rated for 5 kVRMS with default-low fail-safe output (BD suffix). | Used where system safety requires default-low assertion (e.g., disable-by-default gate drivers) instead of default-high. | Select SI8651BD-AS only if hardware design relies on active-low fault signaling or pull-down biasing on A5. |
| ISO6741FDWR | Texas Instruments part with 4-channel output, no input channel, 5000 VRMS rating, and 50 Mbps max data rate - significantly lower speed. | Suitable for slower control loops (e.g., HVAC fan control) but cannot replace SI8651ED-ASR in 100+ Mbps motor encoder or current-sense interfaces. | Choose ISO6741FDWR only for cost-sensitive, non-real-time applications where 150 Mbps capability is unnecessary. |
Compared with SI8651BD-AS, SI8651ED-ASR provides identical isolation and packaging but guarantees fail-safe high output during input-side power loss - critical for preventing unintended power stage activation. Against ISO6741FDWR, SI8651ED-ASR delivers triple the data rate and superior CMTI, making it suitable for next-generation EV and industrial servo systems.
Availability
SI8651ED-ASR is available at Aetrix Electronics and suitable for motor control systems, battery management systems, on-board chargers, and traction inverters requiring stable component supply across automotive and industrial production lifecycles.
Supply support for SI8651ED-ASR 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, high-speed isolation in automotive and industrial power systems - emphasizing AEC-Q100 qualification, 60-year lifetime, and reinforced 5 kVRMS insulation.
FAQ
What is the fail-safe output behavior of SI8651ED-ASR?
The SI8651ED-ASR is factory-configured with default-high fail-safe operation. When VDD1 is unpowered but VDD2 remains active, output A5 remains logic high - a critical safety feature for preventing unintended activation of downstream power devices. This behavior is defined by the "ED" suffix in SI8651ED-ASR and is confirmed in Table 1.1 of the Skyworks datasheet.
Does SI8651ED-ASR support 2.5 V operation on both sides?
Yes, SI8651ED-ASR supports 2.5–5.5 V operation independently on VDD1 and VDD2. At 2.5 V and 1 Mbps, it draws 1.5 mA per channel on VDD1 and 3.5 mA per channel on VDD2 - enabling direct interface with low-voltage microcontrollers and FPGAs without level-shifting circuitry.
What is the creepage and clearance distance of the SI8651ED-ASR package?
The SI8651ED-ASR uses a wide-body SOIC-16 package with 7.5 mm creepage and 8.3 mm clearance distances, certified for 5 kVRMS reinforced insulation per UL 1577, VDE 0884-10, and IEC 62368-1. These dimensions meet safety requirements for 1000 VAC working voltage in industrial and automotive applications.
How does the enable functionality work on SI8651ED-ASR?
SI8651ED-ASR has two independent enable inputs: EN1 controls output A5 (Side A), and EN2 controls outputs B1–B4 (Side B). When EN1 = low, A5 enters high-impedance state; when EN2 = low, B1–B4 enter high-impedance. Both pins are internally pulled up to their respective VDD rails, allowing floating connection if unused - though external tie-off is recommended in noisy environments.
Is SI8651ED-ASR qualified for automotive applications?
Yes, SI8651ED-ASR carries the "-A" suffix indicating full AEC-Q100 Grade 0 qualification (–40 to +125 °C), automotive-specific manufacturing flow, AIAG-compliant PPAP documentation, and IMDS/CAMDS material compliance - making it suitable for battery management systems, on-board chargers, and traction inverters in electric vehicles.
SI8651ED-ASR 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:
- 2.375V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8651ED-ASR FAQ
1.How can I place an order for SI8651ED-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8651ED-ASR 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 SI8651ED-ASR reliable?
The price and inventory of SI8651ED-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8651ED-ASR is usually 5 days.
3.What payment methods are accepted for SI8651ED-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8651ED-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8651ED-ASR?
SI8651ED-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8651ED-ASR 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 SI8651ED-ASR?
For technical support, including SI8651ED-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8651ED-ASR requirements.
6.How does Aetrix verify that SI8651ED-ASR is sourced from the original manufacturer or authorized distributors?
All SI8651ED-ASR 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 SI8651ED-ASR meets industry standards.
7.What is the process for return or replacement of SI8651ED-ASR?
All SI8651ED-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8651ED-ASR, 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 SI8651ED-ASR part is unused and in its original packaging.
Return procedure for SI8651ED-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8651ED-ASR 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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