My Inquiry
My Account
Skyworks Solutions Inc. SI8651EC-AS1R
- Part No.:
- SI8651EC-AS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8651EC-AS1R.pdf
- Description:
- AUTOMOTIVE 3.75 KV 4 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:3,761
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI8651EC-AS1R from Skyworks is a five-channel, automotive-grade digital isolator with 4 input channels on VDD1 side and 1 output channel on VDD2 side, 3.75 kVRMS reinforced isolation rating, 150 Mbps data rate, and selectable high-fail-safe default output state. It operates across –40 to +125 °C and supports 2.5–5.5 V dual supplies for use in battery management systems and traction inverters.
For engineers reviewing the SI8651EC-AS1R datasheet, SI8651EC-AS1R pinout, SI8651EC-AS1R application, or SI8651EC-AS1R equivalent, this page delivers verified electrical specs, fail-safe behavior, CMTI immunity (50 kV/µs), propagation delay (8 ns typ), and automotive qualification (AEC-Q100) - all confirmed for the exact part number and narrow-body SOIC-16 package.
Technical Context
The SI8651EC-AS1R implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture supports independent undervoltage lockout (UVLO) on both sides, with thresholds at 2.24 V (rising) and 2.16 V (falling).
It features two enable inputs (EN1 on VDD1 side for A5; EN2 on VDD2 side for B1–B4), allowing independent tri-state control of input and output channels. The device uses Schmitt-trigger inputs (hysteresis 0.44 V typ) and delivers precise timing: 0.5 ns channel-channel skew, 2 ns propagation delay skew, and 5 ns minimum pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels / Direction | 5-channel: 4 unidirectional inputs (A1–A4), 1 unidirectional output (A5) on VDD1 side; 4 outputs (B1–B4) on VDD2 side |
| Max Data Rate | 150 Mbps - supports high-speed CAN FD, SPI, and isolated ADC interface timing |
| Propagation Delay | 8 ns typical - enables sub-10 ns timing-critical feedback loops in motor control |
| Isolation Rating | 3.75 kVRMS reinforced - certified to UL 1577, VDE 0884-10, IEC 62368-1, and GB4943.1 |
| CMTI | 50 kV/µs - ensures reliable operation in high-dV/dt environments like IGBT gate drivers |
| Supply Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog circuitry |
| Fail-Safe Default | High - output pins B1–B4 drive high during VDD1 loss while VDD2 remains powered |
Pinout & Package
Narrow-body SOIC-16 (NB SOIC-16) package, RoHS-compliant, JEDEC-standard 260 °C peak reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to input logic and channel transmitter; bypass with 0.1 µF capacitor |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8 mm creepage for reinforced insulation |
| A1–A4 | Digital input signals (VDD1 side) | Accept 0–VDD1 logic; Schmitt-triggered for >0.4 V hysteresis and noise rejection |
| A5 | Input signal with EN1 control (VDD1 side) | Enabled only when EN1 = high; otherwise high-impedance - enables multiplexing or clock gating |
| EN1 | Enable for A5 channel | Internally pulled up to VDD1; drives A5 into Hi-Z when low - no external pull-up required |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to output drivers and receiver; requires separate 0.1 µF bypass |
| GND2 | Output-side ground reference | Isolated return for VDD2; forms safety barrier with GND1; defines common-mode transient path |
| B1–B4 | Digital outputs (VDD2 side) | 50 Ω nominal output impedance; default high during VDD1 loss (fail-safe mode) |
| EN2 | Enable for B1–B4 outputs | Controls all four outputs simultaneously; drives them into Hi-Z when low - used for system-level shutdown |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; enables 60-year life at rated working voltage |
| Selectably high fail-safe output | Guarantees known logic state (high) on B1–B4 during input-side power loss - critical for safe shutdown in EV inverters |
| Tri-state enable architecture | Independent EN1 (A5) and EN2 (B1–B4) allow granular channel control without software overhead |
| Automotive-grade process flow | AEC-Q100 qualified, AIAG-compliant PPAP documentation, IMDS/CAMDS listed - meets Tier-1 BMS requirements |
| Ultra-low power at 100 Mbps | 8.0 mA (VDD1) + 18.4 mA (VDD2) typ at 5 V - reduces thermal load in densely packed traction inverter PCBs |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating cell voltage monitoring ADC outputs and MCU command signals in 800 V EV battery packs. IC Role / Device Role / Timing Role: SI8651EC-AS1R transmits isolated analog monitor data (A1–A4) and receives high-side gate commands (B1–B4) with <10 ns timing precision. Use Value: 3.75 kVRMS reinforced insulation meets IEC 62621 for functional safety; fail-safe high output prevents unintended IGBT turn-off during pack communication loss. |
Use Scenario: Interfacing MCU PWM outputs to isolated gate drivers in SiC-based traction inverters. IC Role / Device Role / Timing Role: SI8651EC-AS1R carries four PWM signals (B1–B4) across isolation barrier with 0.5 ns channel skew to maintain phase alignment. Use Value: 50 kV/µs CMTI prevents false triggering during 10 kV/µs switching transients; 150 Mbps headroom supports future firmware updates with encrypted comms. |
| On-Board Charger (OBC) | Industrial Motor Drive |
|
Use Scenario: Isolating digital control signals between AC/DC and DC/DC stages in bidirectional OBCs. IC Role / Device Role / Timing Role: SI8651EC-AS1R routes status flags (A1–A4) from secondary-side controllers to primary-side MCU and relays fault signals (B1–B4) back. Use Value: Dual enable inputs allow coordinated shutdown of both power stages; –40 to +125 °C operation sustains reliability under hood temperatures. |
Use Scenario: Providing isolated feedback and control paths in servo drives with integrated position sensing. IC Role / Device Role / Timing Role: SI8651EC-AS1R interfaces resolver-to-digital converter outputs (A1–A4) and delivers torque command pulses (B1–B4) with deterministic latency. Use Value: 8 ns propagation delay enables real-time current loop closure at 20 kHz; Schmitt inputs reject EMI from nearby IGBT switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8651BB-AS1 | Same 4:1 channel count and NB SOIC-16 package, but default output state is low (not high) | Used where fail-safe low is required (e.g., disable-on-loss in safety interlocks) | Select SI8651EC-AS1R when high-default behavior is mandatory for system-level fault response |
| ISO6741QDWR | TI part with 4-channel 1:0 directionality (no A5 input), 5000 VRMS rating, and 50 Mbps max data rate | Suitable for lower-speed industrial PLC I/O where higher isolation voltage offsets reduced speed need | Choose SI8651EC-AS1R for automotive BMS requiring 150 Mbps, AEC-Q100, and high-fail-safe behavior |
Compared with SI8651BB-AS1, SI8651EC-AS1R provides guaranteed high-default outputs during input-side brownout - essential for ASIL-B–compliant shutdown sequences. Against ISO6741QDWR, it delivers 3× higher data rate and automotive qualification, at the cost of lower isolation voltage.
Availability
SI8651EC-AS1R is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and industrial motor drives requiring stable component supply across automotive and industrial lifecycles.
Supply support for SI8651EC-AS1R 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 automotive and industrial isolation needs - delivering ultra-low power, AEC-Q100 qualification, and reinforced insulation in compact SOIC packages.
FAQ
What is the isolation rating and safety certification status of SI8651EC-AS1R?
SI8651EC-AS1R provides 3.75 kVRMS reinforced isolation and is certified to UL 1577 (5000 VRMS for 1 minute), VDE 0884-10, IEC 62368-1, IEC 60601-1, and GB4943.1. These certifications validate its suitability for medical and automotive end-equipment requiring double or reinforced insulation barriers.
How does the fail-safe mode operate on SI8651EC-AS1R?
SI8651EC-AS1R is configured for high-fail-safe operation: when VDD1 is unpowered but VDD2 remains active, outputs B1–B4 drive high. This behavior is fixed by internal pull-ups and cannot be changed in-circuit - it is defined at manufacturing via ordering code "EC".
What are the supply current requirements of SI8651EC-AS1R at 100 Mbps?
At 100 Mbps with 5 V supplies, SI8651EC-AS1R draws 8.0 mA (typ) from VDD1 and 18.4 mA (typ) from VDD2. Total typical supply current is 26.4 mA, making it suitable for thermally constrained automotive modules where power density matters.
Does SI8651EC-AS1R support 2.5 V logic levels on both sides?
Yes, SI8651EC-AS1R supports 2.5–5.5 V on both VDD1 and VDD2 supplies. At 2.5 V, it delivers 1.5 mA per channel at 1 Mbps and 3.5 mA per channel at 100 Mbps - enabling direct interface with low-voltage microcontrollers and sensors without level shifters.
Is SI8651EC-AS1R pin-compatible with other Si8651 variants in SOIC-16?
Yes, all Si8651 variants in narrow-body SOIC-16 (e.g., SI8651BB-AS1, SI8651BC-AS1, SI8651EC-AS1) share identical pinout and footprint. Channel count, directionality, and fail-safe state differ by part number but do not affect physical layout or PCB design.
SI8651EC-AS1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (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:
- 3750Vrms
- 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
SI8651EC-AS1R FAQ
1.How can I place an order for SI8651EC-AS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8651EC-AS1R 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 SI8651EC-AS1R reliable?
The price and inventory of SI8651EC-AS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8651EC-AS1R is usually 5 days.
3.What payment methods are accepted for SI8651EC-AS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8651EC-AS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8651EC-AS1R?
SI8651EC-AS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8651EC-AS1R 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 SI8651EC-AS1R?
For technical support, including SI8651EC-AS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8651EC-AS1R requirements.
6.How does Aetrix verify that SI8651EC-AS1R is sourced from the original manufacturer or authorized distributors?
All SI8651EC-AS1R 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 SI8651EC-AS1R meets industry standards.
7.What is the process for return or replacement of SI8651EC-AS1R?
All SI8651EC-AS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8651EC-AS1R, 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 SI8651EC-AS1R part is unused and in its original packaging.
Return procedure for SI8651EC-AS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8651EC-AS1R 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…
