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Skyworks Solutions Inc. SI86S621FC-AS
- Part No.:
- SI86S621FC-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI86S621FC-AS.pdf
- Description:
- 3.75 KVRMS ISOLATOR, 2 UNIDIRECT
- Quantity:
- Payment:
- Shipping:
Inventory:1,846
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Product details
Overview
SI86S621FC-AS from Skyworks Solutions is a dual-channel, high-speed digital isolator with reinforced 6000 VRMS isolation, 150 Mbps data rate, and AEC-Q100 qualification for automotive systems. It features Schmitt-trigger + CMOS inputs, selectable fail-safe output (default low), and operates across 2.25–5.5 V supply rails. Used in battery management systems and traction inverters where galvanic separation and noise immunity are critical.
For engineers reviewing the SI86S621FC-AS datasheet, SI86S621FC-AS pinout, SI86S621FC-AS application, or SI86S621FC-AS equivalent, this page delivers verified specifications, validated pin functions, automotive-grade safety certifications (UL, VDE, CSA, CQC), and real-world timing behavior including 9 ns typical propagation delay and 100 kV/µs CMTI.
Technical Context
The SI86S621FC-AS uses 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 UVLO and reset monitoring per side (VDD1/VDD2), with RSTB thresholds at ~1.7 V and UVLO hysteresis of 131 mV.
It integrates input deglitch filters (36 ns) to suppress sub-pulse noise, supports fail-safe operation via ordering option (default low confirmed for -FC suffix), and delivers precise timing: 9 ns typical propagation delay, 3.5 ns pulse width distortion, and <3 ns channel-to-channel skew at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | 150 Mbps - enables high-bandwidth communication in motor control gate drivers and isolated ADC interfaces |
| Propagation delay | 9 ns typical - ensures tight timing alignment between isolated control and feedback paths in power converters |
| Isolation rating | 6000 VRMS - meets reinforced insulation requirements for onboard chargers and battery electric vehicle systems |
| CMTI | 100 kV/µs minimum - sustains reliable operation during fast-switching transients in 800 V traction inverters |
| Supply voltage | 2.25–5.5 V - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level shifters |
| Operating temperature | –40 to +125 °C - qualified for under-hood automotive environments per AEC-Q100 Grade 1 |
| Fail-safe mode | Default low output - prevents unintended activation of high-side switches during power loss in BMS applications |
| Package | SSO-8 - 8-pin wide-body SOIC with 8.0 mm creepage/clearance, supporting 1500 VRMS working voltage per IEC 60747-17 |
Pinout & Package
SI86S621FC-AS is housed in an SSO-8 (wide-body SOIC-8) package with 8.0 mm creepage and clearance, optimized for reinforced insulation in high-voltage automotive systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Side A power supply | Supplies isolated input-side logic; must be bypassed with 0.1 µF + 10 µF capacitors near pin |
| GND1 | Side A ground | Reference for Side A I/O; requires separate PCB plane from GND2 to maintain isolation integrity |
| A1, A2 | Side A digital inputs | Dual-channel inputs with Schmitt-trigger + CMOS thresholds; support 36 ns deglitch filtering |
| GND2 | Side B ground | Reference for Side B outputs; physically separated from GND1 by ≥8.0 mm creepage |
| B1, B2 | Side B digital outputs | Fail-safe default-low outputs; 50 Ω nominal impedance for controlled-impedance trace routing |
| VDD2 | Side B power supply | Supplies isolated output-side logic; independent UVLO and reset monitoring per side |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | No start-up initialization required; eliminates boot-time uncertainty in safety-critical BMS and inverter control loops |
| Selectable fail-safe output | Default-low configuration (-FC suffix) ensures gate drivers remain off during VDD1 loss in high-side switch applications |
| 36 ns input deglitch filter | Rejects EMI-induced glitches below 36 ns width, preventing false triggering in noisy motor drive environments |
| 100 kV/µs CMTI | Withstands fast common-mode transients from SiC/GaN switching without data corruption or latch-up |
| AEC-Q100 Grade 1 qualification | Validated for automotive use up to +125 °C ambient, with PPAP documentation and IMDS/CAMDS support |
| Reinforced IEC 60747-17 rating | Enables single-package isolation in medical and industrial systems requiring two MOPP or 250 VRMS working voltage |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating cell voltage monitoring signals and pack contactor control commands between high-voltage battery stack and low-voltage MCU. IC Role / Device Role / Timing Role: Dual-channel isolator providing galvanic separation for analog sensing and digital command paths with synchronized timing. Use Value: 9 ns propagation delay enables real-time fault response; 6000 VRMS rating supports 800 V battery architectures with margin. |
Use Scenario: Transmitting PWM gate drive signals from MCU to isolated gate drivers in 800 V SiC inverter half-bridges. IC Role / Device Role / Timing Role: High-speed signal isolator preserving edge fidelity and minimizing channel skew between upper/lower gate drivers. Use Value: 150 Mbps data rate and <3 ns channel skew ensure precise dead-time control; 100 kV/µs CMTI prevents misfiring during fast dV/dt switching. |
| Onboard Charger (OBC) | Industrial Motor Drive |
|
Use Scenario: Isolating communication between AC/DC PFC controller and DC/DC LLC controller in bidirectional OBC topologies. IC Role / Device Role / Timing Role: Dual-channel isolator carrying synchronous control signals and status feedback across primary-secondary boundary. Use Value: Default-low fail-safe prevents uncontrolled charging during controller power loss; AEC-Q100 ensures reliability over 15-year vehicle life. |
Use Scenario: Isolating encoder feedback and PWM commands in servo drives operating in factory automation environments. IC Role / Device Role / Timing Role: Robust digital isolator handling position loop closure and safety shutdown signals with high noise immunity. Use Value: Schmitt-trigger inputs reject line noise; 2.25–5.5 V supply range simplifies integration with 3.3 V FPGAs and 5 V ASICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM220N0BRIZ | 5000 VRMS isolation, 150 Mbps, default-high fail-safe, SOIC-8 (narrow body) | Lacks AEC-Q100 qualification and 6000 VRMS rating; narrower creepage limits use in 800 V systems | Choose when cost-sensitive industrial designs require same speed but lower isolation voltage and no automotive compliance |
| ISO7721FDWR | 5000 VRMS, 100 Mbps, default-low, SOIC-8 (narrow body), 2.25–5.5 V | Lower data rate and CMTI (85 kV/µs); not AEC-Q100 qualified; lacks deglitch filter | Prefer for non-automotive motor control where 100 Mbps suffices and budget constraints outweigh timing precision needs |
Compared with ADUM220N0BRIZ and ISO7721FDWR, SI86S621FC-AS uniquely combines 6000 VRMS reinforced isolation, AEC-Q100 Grade 1 qualification, 36 ns input deglitching, and default-low fail-safe in an SSO-8 package-making it the only option qualified for high-voltage automotive traction and charging systems requiring full functional safety alignment.
Availability
SI86S621FC-AS is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and onboard chargers requiring stable component supply across automotive production lifecycles.
Supply support for SI86S621FC-AS 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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-reliability applications.
The Si86S6xx family was designed specifically for automotive and industrial isolation needs-delivering RF-based digital isolation with AEC-Q100 qualification, reinforced safety ratings, and fail-safe configurability for next-generation EV power systems.
FAQ
What is the fail-safe behavior of SI86S621FC-AS during power loss?
The SI86S621FC-AS is ordered with default-low fail-safe mode (indicated by "FC" suffix), meaning its B1 and B2 outputs go low when VDD1 is unpowered but VDD2 remains active. This prevents unintended activation of high-side MOSFETs or IGBTs in battery management and inverter applications, ensuring safe shutdown during controller power interruption. The behavior is hardwired per ordering option and does not require external configuration.
Does SI86S621FC-AS require external components for stable operation?
Yes, SI86S621FC-AS requires 0.1 µF and 10 µF bypass capacitors on both VDD1–GND1 and VDD2–GND2 pairs, placed as close as possible to the pins. These capacitors stabilize supply rails during fast switching events. Optional series resistors (50–300 Ω) may be added to inputs/outputs in highly noisy environments to further suppress EMI, per Section 3.2.1 of the datasheet.
What safety certifications apply to SI86S621FC-AS?
SI86S621FC-AS holds pending certifications for UL 1577 (6000 VRMS), VDE 60747-17 (reinforced insulation), CSA 62368-1/60601-1, and CQC GB4943.1. It achieves 1500 VRMS working voltage (IEC 60747-17) in the SSO-8 package and supports 2 MOPP in medical applications. All certifications are automotive-grade and include AIAG-compliant PPAP documentation support.
How does the 36 ns input deglitch filter function in SI86S621FC-AS?
The SI86S621FC-AS includes a built-in 36 ns input deglitch filter that blocks any input pulse narrower than 36 ns-effectively rejecting ESD-induced spikes and conducted noise in motor drive and inverter environments. Valid pulses pass through with only 36 ns added delay. This feature is silicon-integrated and requires no external components or configuration, enhancing system robustness without design overhead.
Can SI86S621FC-AS operate with mismatched supply voltages on Side A and Side B?
Yes, SI86S621FC-AS supports independent supply rails: VDD1 and VDD2 each operate from 2.25 V to 5.5 V, allowing mixed-voltage interfacing-for example, 3.3 V MCU on Side A and 5 V gate driver on Side B. Each side has autonomous UVLO and reset circuitry, so brownout on one side does not affect the other's functionality, enabling flexible power domain partitioning in complex automotive ECUs.
SI86S621FC-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si86S62x
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 150kV/µs
- Data Rate:
- 10Mbps
- Propagation Delay tpLH / tpHL (Max):
- 41.5ns, 41.5ns
- Pulse Width Distortion (Max):
- 2.5ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 2.25V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SI86S621FC-AS FAQ
1.How can I place an order for SI86S621FC-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86S621FC-AS 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 SI86S621FC-AS reliable?
The price and inventory of SI86S621FC-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86S621FC-AS is usually 5 days.
3.What payment methods are accepted for SI86S621FC-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86S621FC-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86S621FC-AS?
SI86S621FC-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86S621FC-AS 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 SI86S621FC-AS?
For technical support, including SI86S621FC-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86S621FC-AS requirements.
6.How does Aetrix verify that SI86S621FC-AS is sourced from the original manufacturer or authorized distributors?
All SI86S621FC-AS 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 SI86S621FC-AS meets industry standards.
7.What is the process for return or replacement of SI86S621FC-AS?
All SI86S621FC-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI86S621FC-AS, 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 SI86S621FC-AS part is unused and in its original packaging.
Return procedure for SI86S621FC-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86S621FC-AS 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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