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Skyworks Solutions Inc. SI86SO21BE-AS4R
- Part No.:
- SI86SO21BE-AS4R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI86SO21BE-AS4R.pdf
- Description:
- 6.0 KVRMS INVERTING OUTPUT ISOLA
- Quantity:
- Payment:
- Shipping:
Inventory:4,262
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Product details
Overview
SI86SO21BE-AS4R from Skyworks Solutions is a dual-channel, inverting-output digital isolator with reinforced 6000 VRMS isolation, 150 Mbps data rate, and AEC-Q100 qualification for automotive systems. It features Schmitt-trigger inputs, selectable fail-safe default-low output, and operates across 2.25–5.5 V supply rails on both sides - deployed in battery management systems and traction inverters where high CMTI and precise timing are critical.
For engineers reviewing the SI86SO21BE-AS4R datasheet, SI86SO21BE-AS4R pinout, SI86SO21BE-AS4R application, or SI86SO21BE-AS4R equivalent, key selection criteria include its 10 ns typical propagation delay, 100 kV/µs common-mode transient immunity, fail-safe ordering option (default-low), SSO-8 package with 8.0 mm creepage/clearance, and compliance with IEC 60747-17 reinforced insulation standards.
Technical Context
The SI86SO21BE-AS4R 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 deterministic timing with ≤4.5 ns pulse width distortion and channel-to-channel skew of ≤3 ns.
It integrates independent undervoltage lockout (UVLO) and reset circuitry per side (VDD1/VDD2), with UVLO thresholds at 2.18 V (rising) and 2.05 V (falling), plus reset thresholds at ~1.7 V. The device supports fail-safe operation via factory-configured default-low output state during input-side power loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 150 Mbps - supports high-speed CAN FD, SPI, and isolated ADC interfaces without protocol bottlenecks |
| Propagation Delay | 9 ns typical - enables tight timing closure in motor control PWM feedback loops |
| CMTI | 100 kV/µs minimum - maintains signal integrity in high-dV/dt environments like 800 V traction inverters |
| Isolation Rating | 6000 VRMS - meets reinforced insulation requirements for 1000 V AC mains and EV battery systems |
| Supply Range | 2.25–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends |
| Fail-Safe Mode | Default-low output - ensures safe shutdown state in BMS fault conditions when Side A loses power |
| Operating Temp | –40 to +125 °C - qualified for under-hood automotive placement per AEC-Q100 Grade 0 |
Pinout & Package
SI86SO21BE-AS4R uses an SSO-8 (wide-body SOIC-8) package with 8.0 mm creepage and clearance, optimized for 6000 VRMS reinforced insulation. Pin 1 = VDD1, Pin 2 = A1, Pin 3 = A2, Pin 4 = GND1, Pin 5 = GND2, Pin 6 = B1, Pin 7 = B2, Pin 8 = VDD2. Pins A1/A2 and B1/B2 are unidirectional digital I/O channels with inverting logic relationship between input and output sides.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Side A power supply | Supplies primary-side logic; must be bypassed with 0.1 µF + 10 µF capacitors |
| A1, A2 | Side A digital inputs | Inverting inputs driving isolated outputs B1/B2; accept CMOS/Schmitt thresholds |
| GND1 | Side A ground reference | Return path for VDD1; must be separated from GND2 by isolation barrier |
| GND2 | Side B ground reference | Return path for VDD2; galvanically isolated from GND1 |
| B1, B2 | Side B digital outputs | Inverted replicas of A1/A2; 50 Ω nominal output impedance for controlled-impedance routing |
| VDD2 | Side B power supply | Supplies secondary-side logic; independent voltage domain from VDD1 |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift; enables <300 µs start-up with no initialization sequence |
| Selectably configured fail-safe mode | Factory-set default-low output ensures predictable BMS shutdown behavior during input-side brownout |
| High CMTI (100 kV/µs) | Prevents data corruption in 800 V SiC inverter switching noise environments |
| Reinforced IEC 60747-17 rating | Validates 2121 Vpeak working voltage for long-term reliability in EV drivetrain applications |
| AEC-Q100 Grade 0 qualification | Guarantees operation up to +125 °C junction temperature in automotive under-hood locations |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
Use Scenario: Isolating cell voltage monitoring ADCs and pack contactor control signals in 400–800 V EV battery packs. IC Role / Device Role / Timing Role: Dual-channel isolator providing reinforced insulation between low-voltage MCU and high-voltage battery domain; inverting logic matches typical BMS fault-signaling polarity. Use Value: 6000 VRMS isolation withstand prevents catastrophic failure during insulation breakdown events; 10 ns propagation delay enables real-time cell balancing decisions. | Use Scenario: Transmitting PWM gate-drive enable/disable commands from MCU to isolated gate drivers in SiC-based traction inverters. IC Role / Device Role / Timing Role: High-speed digital isolator conveying safety-critical enable signals across isolation barrier; default-low fail-safe ensures gate drivers disable on MCU power loss. Use Value: 100 kV/µs CMTI prevents false triggering during 5–10 kV/µs dV/dt transients; 150 Mbps supports multi-axis motor control loop updates. |
| Onboard Charger (OBC) | Industrial PLC I/O Module |
Use Scenario: Isolating communication lines (e.g., isolated UART or SPI) between OBC controller and AC/DC stage for grid synchronization. IC Role / Device Role / Timing Role: Dual-channel isolator separating functional safety domains; inverting outputs interface directly with RS-485 transceivers requiring complementary logic. Use Value: AEC-Q100 qualification ensures longevity in thermally stressed OBC enclosures; 2.25–5.5 V supply range simplifies biasing from multiple rail converters. | Use Scenario: Providing isolated digital input conditioning for 24 V DC field sensors in industrial automation cabinets. IC Role / Device Role / Timing Role: Dual-channel isolator converting noisy 24 V sensor signals to clean 3.3 V logic levels for PLC CPU; Schmitt-trigger inputs reject EMI-induced glitches. Use Value: 36 ns input deglitch filter (enabled in SOx variants) suppresses contact bounce and relay noise; 8.0 mm creepage meets IEC 61000-4-5 surge requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM121N1BRZ-RL7 | Single-channel, non-inverting, 150 Mbps, 3000 VRMS isolation, SOIC-8 | Lacks reinforced 6000 VRMS rating and AEC-Q100 qualification; unsuitable for automotive BMS | Use only in non-safety-critical industrial 3.3 V systems requiring lower isolation voltage |
| ISO7721DWR | Dual-channel, non-inverting, 100 Mbps, 5000 VRMS, SOIC-8, no AEC-Q100 | Lower data rate and isolation voltage; lacks default-low fail-safe configuration | Acceptable for cost-sensitive industrial PLCs where 150 Mbps and 6000 VRMS are not required |
Compared with ADUM121N1BRZ-RL7 and ISO7721DWR, SI86SO21BE-AS4R uniquely combines AEC-Q100 Grade 0, 6000 VRMS reinforced isolation, inverting logic, and factory-configured default-low fail-safe - making it the only qualified option for automotive battery domain signal isolation where functional safety and high-voltage robustness are mandatory.
Availability
SI86SO21BE-AS4R is available at Aetrix Electronics and suitable for battery management systems, traction inverters, onboard chargers, and industrial PLC I/O modules requiring stable component supply, long-term automotive-grade availability, and certified reinforced isolation.
Supply support for SI86SO21BE-AS4R 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, wireless infrastructure, and high-reliability isolation technologies.
The Si86S61x/S62x/SOx family was engineered specifically for automotive and industrial applications demanding reinforced isolation, AEC-Q100 compliance, and high CMTI - targeting EV powertrain, renewable energy inverters, and safety-critical control systems.
FAQ
What is the isolation voltage rating of SI86SO21BE-AS4R and which safety standards does it meet?
SI86SO21BE-AS4R is rated for 6000 VRMS isolation per UL 1577 and carries reinforced insulation certification per IEC 60747-17 (2121 Vpeak), CSA 62368-1, and CQC GB4943.1. These ratings validate its use in automotive battery systems and industrial equipment requiring double protection against electric shock. The SSO-8 package provides 8.0 mm creepage and clearance to support these certifications.
Does SI86SO21BE-AS4R support fail-safe operation, and how is it configured?
Yes, SI86SO21BE-AS4R is factory-configured for default-low fail-safe operation - meaning outputs B1 and B2 go low when Side A (input side) loses power while Side B remains powered. This behavior is fixed per ordering code (the "BE" suffix denotes default-low); no external configuration is needed. It ensures safe shutdown in BMS fault conditions without additional circuitry.
What are the supply voltage requirements for SI86SO21BE-AS4R on each side of the isolation barrier?
SI86SO21BE-AS4R supports independent 2.25 V to 5.5 V supplies on both VDD1 (Side A) and VDD2 (Side B). Each side requires local 0.1 µF + 10 µF bypass capacitors. The wide range enables interoperability with 3.3 V MCUs and 5 V analog subsystems, and the dual-rail design eliminates level-shifting components in mixed-voltage systems.
How does the RF-based isolation architecture of SI86SO21BE-AS4R improve reliability compared to optocouplers?
SI86SO21BE-AS4R uses RF on/off keying across a silicon dioxide isolation barrier instead of LEDs and photodiodes. This eliminates LED aging, temperature-dependent current transfer ratio (CTR) drift, and slow turn-off times. It achieves consistent 10 ns propagation delay over temperature and lifetime, requires no startup initialization, and delivers superior noise immunity - especially critical in high-dV/dt automotive environments.
Is SI86SO21BE-AS4R pin-compatible with other devices in the Si86S61x/S62x/SOx family?
SI86SO21BE-AS4R shares the same SSO-8 pinout as other dual-channel SOx variants (e.g., SI86SO20BE-AS4R), but differs from S61x/S62x series in output logic polarity (inverting vs. non-inverting) and fail-safe configuration. Pin compatibility exists within the SOx subgroup, but logic inversion and default state must be verified in system firmware and safety analysis before substitution.
SI86SO21BE-AS4R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si86SOx
- Package/Case:
- 8-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 6000Vrms
- Common Mode Transient Immunity (Min):
- 150kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 13.5ns, 13.5ns
- 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-SSO
SI86SO21BE-AS4R FAQ
1.How can I place an order for SI86SO21BE-AS4R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SO21BE-AS4R 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 SI86SO21BE-AS4R reliable?
The price and inventory of SI86SO21BE-AS4R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SO21BE-AS4R is usually 5 days.
3.What payment methods are accepted for SI86SO21BE-AS4R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SO21BE-AS4R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SO21BE-AS4R?
SI86SO21BE-AS4R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SO21BE-AS4R 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 SI86SO21BE-AS4R?
For technical support, including SI86SO21BE-AS4R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SO21BE-AS4R requirements.
6.How does Aetrix verify that SI86SO21BE-AS4R is sourced from the original manufacturer or authorized distributors?
All SI86SO21BE-AS4R 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 SI86SO21BE-AS4R meets industry standards.
7.What is the process for return or replacement of SI86SO21BE-AS4R?
All SI86SO21BE-AS4R units undergo pre-shipment inspection (PSI). If there is an issue with SI86SO21BE-AS4R, 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 SI86SO21BE-AS4R part is unused and in its original packaging.
Return procedure for SI86SO21BE-AS4R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SO21BE-AS4R 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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