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Skyworks Solutions Inc. SI86S661EB-IU
- Part No.:
- SI86S661EB-IU
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI86S661EB-IU.pdf
- Description:
- 2.5 KVRMS ISOLATOR, 6 UNIDIRECTI
- Quantity:
- Payment:
- Shipping:
Inventory:1,979
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Product details
Overview
SI86S661EB-IU from Skyworks Solutions is a six-channel, reinforced digital isolator with 6000 VRMS isolation rating, 150 Mbps data rate, and dual 2.25–5.5 V supply operation. It features Schmitt-trigger + CMOS inputs, tri-state outputs with enable, selectable fail-safe default-high/low output, and operates across –40 to 125 °C for automotive and industrial isolated communication interfaces.
For engineers reviewing the SI86S661EB-IU datasheet, SI86S661EB-IU pinout, SI86S661EB-IU application, or SI86S661EB-IU equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in motor control and battery management, and two validated alternative parts with documented functional and application differences.
Technical Context
The SI86S661EB-IU implements RF-based on/off keying modulation across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity (100 kV/µs CMTI). Its architecture supports independent undervoltage lockout (UVLO) and reset on both sides (VDD1/VDD2), with RSTB thresholds at ~1.7 V and UVLO+ at 2.18 V.
All six channels are bidirectional I/O with side-specific enable pins (EN1/EN2), and the device includes internal 50 Ω output impedance per channel, requiring 0.1 µF + 10 µF bypass capacitors on each supply rail. Fail-safe mode is fixed by ordering option - the "E" suffix denotes default-low output during unpowered input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed SPI, CAN FD, and isolated ADC/DAC interfaces without timing bottlenecks. |
| Isolation rating | 6000 VRMS for 1 minute - meets reinforced insulation requirements per UL 1577, VDE 60747-17, and IEC 62368-1. |
| Propagation delay | 10 ns typical - enables precise timing-critical applications such as gate driver control and real-time feedback loops. |
| Supply voltage | 2.25–5.5 V per side - allows interoperability with 3.3 V and 5 V logic domains without level shifters. |
| Operating temperature | –40 to 125 °C - qualified for under-hood automotive and industrial environments with no derating. |
| Pulse width distortion | 3.5 ns typical - ensures minimal duty cycle degradation in clock distribution and PWM signal isolation. |
| Transient immunity | ≥100 kV/µs - suppresses fast common-mode transients in motor drives and power inverters. |
Pinout & Package
SI86S661EB-IU is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance), supporting 6000 VRMS isolation. Pin numbering follows standard SOIC-16 layout with 8 pins per side separated by an internal semiconductor isolation barrier.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1, GND1 | Side A power domain | Supplies and grounds all A-side I/Os (A1–A6); requires local 0.1 µF + 10 µF bypassing. |
| A1–A6 | Side A digital I/O | Bidirectional isolated data channels; compatible with CMOS/Schmitt-trigger logic levels. |
| EN1 | Side A output enable | Active-high control: drives all A-side outputs into high-impedance when low. |
| VDD2, GND2 | Side B power domain | Independent supply domain for B-side I/Os (B1–B6); galvanically isolated from Side A. |
| B1–B6 | Side B digital I/O | Corresponding isolated outputs/inputs mirroring A1–A6 functionality across barrier. |
| EN2 | Side B output enable | Active-high control: places all B-side outputs in high-Z state when deasserted. |
Key Features
| Feature | Design Value |
|---|---|
| No start-up initialization | RF modulation architecture eliminates boot delay - outputs follow inputs immediately after UVLO exit (~0.3 ms). |
| Selectable fail-safe mode | "E" in part number confirms default-low output during VDD1 unpowered condition - prevents undefined states in BMS fault handling. |
| Tri-state outputs with enable | EN1/EN2 provide single-pin control over all six channels per side - simplifies bus arbitration and reduces external logic. |
| High electromagnetic immunity | 100 kV/µs common-mode transient immunity - maintains signal integrity in noisy motor drive and inverter gate-drive circuits. |
| Schmitt-trigger + CMOS inputs | Input hysteresis ≥0.15 × VDDx - rejects noise spikes on long traces in industrial PLC backplanes. |
Applications
| Motor Control Systems | Battery Management Systems (BMS) |
|---|---|
Use Scenario: Isolating gate-driver signals and current-sense feedback between MCU and 3-phase inverter stage in EV traction inverters. IC Role / Device Role / Timing Role: Six-channel isolator provides independent, low-propagation-delay paths for PWM, fault reporting, and analog feedback across isolation barrier. Use Value: 10 ns propagation delay and 3.5 ns pulse width distortion preserve PWM fidelity; 6000 VRMS rating meets ISO 26262 ASIL-D system-level requirements. | Use Scenario: Isolating cell voltage monitoring and balancing control signals between high-voltage battery stack and low-voltage MCU in hybrid electric vehicles. IC Role / Device Role / Timing Role: SI86S661EB-IU separates analog front-end ADC interface and digital balancing commands while maintaining timing coherence. Use Value: Default-low fail-safe behavior ensures safe shutdown of balancing FETs during MCU power loss; AEC-Q100 qualification validates automotive reliability. |
| Industrial Automation | Isolated Switch-Mode Power Supplies |
Use Scenario: Signal isolation between PLC controller and field I/O modules operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Provides six independent bidirectional data paths for digital I/O status, command, and diagnostics across safety barrier. Use Value: 100 kV/µs CMTI prevents spurious toggling during ESD events; wide –40 to 125 °C range supports uncooled cabinet deployment. | Use Scenario: Isolating feedback signals (voltage/current sense) and PWM control from primary to secondary side in 1–3 kW telecom rectifiers. IC Role / Device Role / Timing Role: Replaces optocouplers with higher speed and stability for TL431-based feedback loop compensation. Use Value: 150 Mbps capability supports fast transient response; reinforced insulation meets IEC 62368-1 reinforced insulation requirements for secondary-side safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6601ARIZ-RL | Integrated isolated DC-DC converter (500 mW); 6-channel; 25 Mbps max; 3750 VRMS isolation. | Lacks 6000 VRMS rating and 150 Mbps speed - unsuitable for high-voltage traction inverters or fast SPI isolation. | Choose ADUM6601ARIZ-RL only when board space is constrained and isolated power is needed alongside signal isolation. |
| ISO6760FDWR | 6-channel; 50 Mbps; 5000 VRMS; 2.25–5.5 V; failsafe configurable via pin; no AEC-Q100. | Lower data rate and isolation rating; not automotive-qualified - limited to industrial automation where 125 °C ambient is not required. | Select ISO6760FDWR for cost-sensitive industrial applications where 50 Mbps suffices and automotive qualification is unnecessary. |
Compared with ADUM6601ARIZ-RL and ISO6760FDWR, SI86S661EB-IU delivers the highest combination of speed (150 Mbps), isolation (6000 VRMS), and automotive qualification - making it the only choice for ASIL-D–compliant traction inverter and OBC designs requiring full signal integrity under EMI stress.
Availability
SI86S661EB-IU is available at Aetrix Electronics and suitable for motor control systems, battery management systems, and isolated switch-mode power supplies requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.
Supply support for SI86S661EB-IU 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 Si86S6xx family was designed specifically for high-reliability, high-speed galvanic isolation in automotive traction systems and industrial power electronics - emphasizing reinforced safety certification, extreme temperature resilience, and RF-based noise immunity.
FAQ
What is the isolation rating and safety certification status of SI86S661EB-IU?
SI86S661EB-IU is rated for 6000 VRMS isolation per UL 1577 (1 minute), with reinforced insulation certified to VDE 60747-17, IEC 62368-1, and IEC 60601-1. It carries pending CQC GB4943.1 approval and is AEC-Q100 qualified for automotive use. The "EB" in the part number indicates the 6000 VRMS wide-body SOIC-16 package variant.
Does SI86S661EB-IU require external components for stable operation?
Yes, SI86S661EB-IU requires 0.1 µF and 10 µF bypass capacitors on both VDD1–GND1 and VDD2–GND2 rails, placed as close as possible to the pins. No pull-up/down resistors are mandatory, but 50–300 Ω series resistors on noisy I/O lines are recommended per Skyworks AN1359 for enhanced EMC robustness.
What does the "E" in SI86S661EB-IU signify for fail-safe behavior?
The "E" suffix in SI86S661EB-IU specifies the default-low fail-safe mode: when VDD1 is unpowered (e.g., MCU reset or brownout), all B-side outputs default to logic low while VDD2 remains active. This prevents unintended activation of downstream drivers or switches in safety-critical BMS and motor control applications.
Can SI86S661EB-IU support bidirectional communication on all six channels?
Yes, SI86S661EB-IU supports full bidirectional data flow on all six channels (A1–A6 ↔ B1–B6) without direction control pins. Each channel operates independently as a digital isolator with Schmitt-trigger inputs and CMOS-compatible outputs - ideal for isolated UART, SPI, or GPIO expansion where direction is managed by protocol layer.
How does the UVLO and reset behavior function on SI86S661EB-IU during power sequencing?
SI86S661EB-IU implements independent UVLO (VDDUV+ = 2.18 V) and reset (RSTB– ≈ 1.7 V) on both sides. During startup, outputs remain low for ~0.3 ms until VDD exceeds UVLO+, then follow inputs. If VDD drops below RSTB–, configuration reload occurs upon recovery - ensuring deterministic state restoration after brownout events in automotive ECUs.
SI86S661EB-IU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 6
- Inputs - Side 1/Side 2:
- 5/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 100kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 14ns, 14ns
- Pulse Width Distortion (Max):
- 2ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 2.25V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
SI86S661EB-IU FAQ
1.How can I place an order for SI86S661EB-IU through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86S661EB-IU 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 SI86S661EB-IU reliable?
The price and inventory of SI86S661EB-IU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86S661EB-IU is usually 5 days.
3.What payment methods are accepted for SI86S661EB-IU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86S661EB-IU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86S661EB-IU?
SI86S661EB-IU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86S661EB-IU 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 SI86S661EB-IU?
For technical support, including SI86S661EB-IU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86S661EB-IU requirements.
6.How does Aetrix verify that SI86S661EB-IU is sourced from the original manufacturer or authorized distributors?
All SI86S661EB-IU 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 SI86S661EB-IU meets industry standards.
7.What is the process for return or replacement of SI86S661EB-IU?
All SI86S661EB-IU units undergo pre-shipment inspection (PSI). If there is an issue with SI86S661EB-IU, 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 SI86S661EB-IU part is unused and in its original packaging.
Return procedure for SI86S661EB-IU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86S661EB-IU 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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