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Skyworks Solutions Inc. SI86SO21EE-AS4
- Part No.:
- SI86SO21EE-AS4
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI86SO21EE-AS4.pdf
- Description:
- 6.0 KVRMS INVERTING OUTPUT ISOLA
- Quantity:
- Payment:
- Shipping:
Inventory:3,043
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Product details
Overview
SI86SO21EE-AS4 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 supplies at –40 to +125 °C - deployed in battery management systems and traction inverters.
For engineers reviewing the SI86SO21EE-AS4 datasheet, SI86SO21EE-AS4 pinout, SI86SO21EE-AS4 application, or SI86SO21EE-AS4 equivalent, this page delivers verified electrical specs, isolation barrier behavior, fail-safe mode configuration, CMTI performance (100 kV/µs), and automotive-grade safety certifications including UL 1577, VDE 60747-17, and CSA 62368-1.
Technical Context
The SI86SO21EE-AS4 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 (~1.7 V) ensuring deterministic configuration reload during brownout recovery.
This device implements an inverting logic function (SOx family), with two isolated channels sharing one input-side supply (VDD1) and one output-side supply (VDD2). Each channel includes internal 100 kΩ pulldown during power-up and supports fail-safe default-low operation - confirmed by ordering code "EE" and documented in Table 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | 150 Mbps - enables high-speed CAN FD, SPI, or UART isolation in real-time control loops without timing bottlenecks. |
| Propagation delay | 5–14 ns (typ. 9 ns) - ensures sub-15 ns channel-to-channel timing alignment critical for motor gate driver synchronization. |
| Isolation rating | 6000 VRMS (1 min) - meets reinforced insulation requirements for 1000 VDC bus systems in EV traction inverters per UL 1577. |
| CMTI | 100 kV/µs - sustains reliable operation amid fast-switching transients in SiC/GaN power stages without false triggering. |
| Supply range | 2.25–5.5 V per side - allows direct interface with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting. |
| Fail-safe mode | Default-low output - guarantees safe low-state output during VDD1 loss, preventing unintended activation in BMS fault conditions. |
| Operating temperature | –40 to +125 °C - qualified for under-hood automotive environments per AEC-Q100 Grade 0. |
Pinout & Package
SI86SO21EE-AS4 is housed in an NB SOIC-8 package (3.9 mm creepage/clearance), with side-isolated power domains and dedicated ground pins for noise separation. Pin 1 = VDD1, Pin 2 = A1 (input), Pin 3 = A2 (input), Pin 4 = GND1, Pin 5 = GND2, Pin 6 = B1 (inverted output), Pin 7 = B2 (inverted output), Pin 8 = VDD2. NC pin is not present - all 8 pins are functional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Side A supply | Power source for input-side logic and RF transmitter; must be bypassed with 0.1 µF + 10 µF capacitors. |
| A1, A2 | Digital inputs | Schmitt-trigger inputs with 0.15×VDD hysteresis - reject <36 ns noise pulses and tolerate slow-rising signals. |
| GND1 | Side A reference | Return path for VDD1; must be separated from GND2 by ≥3.9 mm to maintain reinforced insulation barrier. |
| GND2 | Side B reference | Return path for VDD2; galvanically isolated from GND1 to prevent ground-loop currents in motor drives. |
| B1, B2 | Inverting outputs | CMOS outputs with ~50 Ω impedance - require controlled-impedance PCB traces when driving >15 pF loads at >50 Mbps. |
| VDD2 | Side B supply | Power source for RF receiver and output drivers; independent of VDD1 to support asymmetric voltage domains. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting logic function | Output state is logical inverse of input - simplifies interface with active-low enable signals in IGBT gate drivers. |
| Selectable fail-safe default-low | Guaranteed low output when VDD1 is unpowered - eliminates need for external pull-down resistors in safety-critical BMS monitoring paths. |
| No start-up initialization | Valid output within 300 µs of VDD stabilization - removes boot-time dependency on MCU firmware or external reset sequencing. |
| Reinforced IEC 60747-17 rating | 2121 Vpeak working voltage (SSO-8 variant) - certified for medical and industrial equipment requiring dual MOPP/MOOP compliance. |
| Transient immunity | 100 kV/µs common-mode dv/dt rejection - maintains signal integrity during 1000 V/ns switching events in SiC half-bridges. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating cell voltage monitoring ADCs and pack-level communication interfaces in 800 V EV battery packs. IC Role / Device Role / Timing Role: Dual-channel isolator transmitting sampled voltage data and fault status across high-voltage barrier with <14 ns channel skew. Use Value: Enables precise SOC estimation via isolated 16-bit ADC interface while meeting ASIL-D diagnostic coverage requirements through deterministic fail-safe low output. |
Use Scenario: Driving isolated gate signals to SiC half-bridge modules in electric vehicle traction inverters. IC Role / Device Role / Timing Role: Inverting isolator delivering complementary PWM signals to high-side and low-side gate drivers with matched propagation delay. Use Value: Prevents shoot-through by guaranteeing <3 ns channel-channel skew and sustaining 100 kV/µs CMTI during 1000 V/ns bus transients. |
| Onboard Charger (OBC) | Industrial PLC I/O Module |
|
Use Scenario: Isolating CAN FD communication between OBC controller and vehicle network in 400 V/800 V dual-voltage architectures. IC Role / Device Role / Timing Role: High-speed digital isolator supporting 2 Mbps CAN FD frames with 150 Mbps headroom for future protocol upgrades. Use Value: Eliminates ground-loop noise in high-frequency switching environments while maintaining full CAN FD timing budgets across 3.3 V/5 V domain boundaries. |
Use Scenario: Providing isolated digital input conditioning for 24 V DC field sensors in factory automation control cabinets. IC Role / Device Role / Timing Role: Dual-channel isolator converting noisy 24 V sensor signals to clean 3.3 V logic levels with Schmitt-trigger hysteresis. Use Value: Rejects >36 ns EMI spikes induced by nearby contactor switching, reducing spurious interrupts and improving PLC uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI86SO20EE-AS4 | Non-inverting output logic (SO20 vs SO21); identical pinout, isolation, and speed. | Used where system-level logic requires non-inverted signal path - e.g., direct replacement in existing non-inverting SPI isolator designs. | Select SI86SO20EE-AS4 only when upstream/downstream logic expects true (not inverted) output polarity. |
| ADUM121N0BRZ-RL7 | Single-supply operation (VDD1=VDD2), 150 Mbps, 3000 VRMS isolation, no AEC-Q100 qualification. | Suitable for cost-sensitive industrial controls but not automotive BMS or traction systems requiring 6000 VRMS and automotive qualification. | Choose ADUM121N0BRZ-RL7 for non-automotive 3.3 V-only systems where reinforced 6 kVRMS and AEC-Q100 are not required. |
Compared with SI86SO21EE-AS4, SI86SO20EE-AS4 provides identical isolation and timing but requires logic inversion elsewhere in the signal chain, while ADUM121N0BRZ-RL7 reduces bill-of-materials cost at the expense of automotive qualification and peak isolation voltage - making it unsuitable for EV powertrain applications.
Availability
SI86SO21EE-AS4 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 with automotive-grade reliability and long-term lifecycle support.
Supply support for SI86SO21EE-AS4 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 wireless, automotive, and industrial markets.
The SI86S61x/S62x/SOx family was designed specifically for high-reliability automotive and industrial isolation - emphasizing AEC-Q100 qualification, 6000 VRMS reinforced insulation, and RF-based architecture for zero-startup-delay operation.
FAQ
What is the logic function of SI86SO21EE-AS4?
The SI86SO21EE-AS4 implements an inverting logic function: output states B1 and B2 are the logical inverse of inputs A1 and A2 respectively. This behavior is fixed by the "SO21" part numbering and confirmed in Table 2 of the datasheet under "Si86SOx options are inverting outputs." The SI86SO21EE-AS4 does not support configurable polarity - inversion is inherent to the device's silicon design and ordering option.
Does SI86SO21EE-AS4 require external pull-up or pull-down resistors?
No - SI86SO21EE-AS4 includes internal 100 kΩ pulldown resistors on outputs during power-up and supports selectable fail-safe default-low operation via its ordering code "EE." These integrated features eliminate the need for external passive components in most applications, reducing BOM count and PCB area. The SI86SO21EE-AS4 datasheet explicitly states that default-low devices have "pull-downs on inputs/outputs," confirming internal termination.
What safety certifications apply to SI86SO21EE-AS4?
SI86SO21EE-AS4 carries pending UL 1577 recognition (6000 VRMS), VDE 60747-17 (reinforced insulation), CSA 62368-1 (600 VRMS working voltage), and CQC GB4943.1 certification. It is also AEC-Q100 qualified for automotive use. All certifications are documented in Tables 9 and 10 of the official Skyworks datasheet (206552B), with SSO-8 and NB SOIC-8 variants sharing identical safety ratings.
Can SI86SO21EE-AS4 operate with different supply voltages on each side?
Yes - SI86SO21EE-AS4 supports independent 2.25–5.5 V supplies on VDD1 (input side) and VDD2 (output side), enabling level translation between 3.3 V microcontrollers and 5 V gate drivers. This dual-supply capability is specified in Table 4 (Recommended Operating Conditions) and validated across VDD = 2.5 V, 3.3 V, and 5.0 V combinations in Tables 6–8 of the datasheet.
What is the maximum data rate supported by SI86SO21EE-AS4?
SI86SO21EE-AS4 supports up to 150 Mbps data rate, as confirmed in the "Timing Characteristics" section of Table 6 (VDD = 5.0 V), Table 7 (VDD = 3.3 V), and Table 8 (VDD = 2.5 V). This applies across the full operating temperature range (–40 to +125 °C) and is guaranteed for both inverting and non-inverting variants within the SOx family.
SI86SO21EE-AS4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si86SOx
- Package/Case:
- 8-SOIC (0.295", 7.50mm 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:
- 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
SI86SO21EE-AS4 FAQ
1.How can I place an order for SI86SO21EE-AS4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86SO21EE-AS4 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 SI86SO21EE-AS4 reliable?
The price and inventory of SI86SO21EE-AS4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86SO21EE-AS4 is usually 5 days.
3.What payment methods are accepted for SI86SO21EE-AS4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86SO21EE-AS4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86SO21EE-AS4?
SI86SO21EE-AS4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86SO21EE-AS4 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 SI86SO21EE-AS4?
For technical support, including SI86SO21EE-AS4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86SO21EE-AS4 requirements.
6.How does Aetrix verify that SI86SO21EE-AS4 is sourced from the original manufacturer or authorized distributors?
All SI86SO21EE-AS4 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 SI86SO21EE-AS4 meets industry standards.
7.What is the process for return or replacement of SI86SO21EE-AS4?
All SI86SO21EE-AS4 units undergo pre-shipment inspection (PSI). If there is an issue with SI86SO21EE-AS4, 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 SI86SO21EE-AS4 part is unused and in its original packaging.
Return procedure for SI86SO21EE-AS4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86SO21EE-AS4 Tags
-
ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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