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Skyworks Solutions Inc. SI88221ED-ASR
- Part No.:
- SI88221ED-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88221ED-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:3,116
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Product details
Overview
SI88221ED-ASR from Skyworks Solutions is a dual-channel digital isolator with integrated isolated DC-DC converter, delivering up to 2 W of regulated 3.3 V or 5.0 V output power across 5 kVRMS isolation. It features two unidirectional CMOS isolation channels (A1/A2 → B1/B2), 100 Mbps data rate, 23 ns max propagation delay, and operates from –40 °C to +125 °C. It is used in industrial motor control systems requiring galvanic separation between gate drivers and MCU logic.
For engineers reviewing the SI88221ED-ASR datasheet, SI88221ED-ASR pinout, SI88221ED-ASR application, or SI88221ED-ASR equivalent, this page provides verified technical context, exact pin functions, real-world use cases, and validated alternative parts for isolated power + signal transfer in high-noise environments.
Technical Context
The SI88221ED-ASR implements RF-based on/off keying modulation across a silicon dioxide capacitive barrier, enabling robust noise immunity and eliminating startup initialization. Its integrated flyback DC-DC controller uses peak current mode control with secondary-side voltage sensing via VSNS and closed-loop feedback transmitted across the isolation barrier.
It supports low-voltage input configurations (3–5.5 V to 3/5 V) using internal power switches (VSW), includes shutdown (SH pin), soft-start (SS pin), and dithering for EMI reduction. Thermal shutdown and cycle-skipping at light loads are built-in; no optocoupler or external bias circuitry is required for regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute (UL 1577, VDE, CSA, CQC certified) |
| Data Rate | Up to 100 Mbps - enables high-speed SPI, RS-485, or PWM signal isolation |
| Propagation Delay | 23 ns max - ensures tight timing alignment in real-time control loops |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power secondary-side MCU, gate driver, or ADC |
| Operating Temperature | –40 °C to +125 °C - qualified for automotive and industrial under-hood applications |
| Transient Immunity | 100 kV/µs (typical) - withstands fast-rising common-mode noise in motor drives |
| AEC-Q100 Grade | Qualified - meets automotive reliability requirements for ECU and inverter modules |
Pinout & Package
SI88221ED-ASR is housed in a RoHS-compliant SOIC-16 wide-body package (10.3 mm × 10.3 mm, 2.3 mm height) with creepage/clearance ≥8.3 mm per IEC 60664-1.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GNDP | Primary-side power ground - connects to transformer primary return and VDDP decoupling |
| 2 | VSW | Internal switch output - drives transformer primary directly in low-voltage configurations |
| 3 | VDDP | Primary-side power supply (3–5.5 V) - powers DC-DC controller and primary-side logic |
| 4 | VDDA | Primary-side signal supply - powers A1/A2 transmitter circuits and UVLO monitoring |
| 5 | GNDA | Primary-side signal ground - reference for A1/A2 inputs and VDDA bypass |
| 6 | SH | Shutdown control - high-level assertion disables DC-DC converter; tied to GND for normal operation |
| 7 | A1 | Channel 1 forward input - unidirectional digital input from MCU GPIO or SPI MOSI |
| 8 | A2 | Channel 2 forward input - second unidirectional input for status or enable signals |
| 9 | B1 | Channel 1 reverse output - isolated output driving gate driver enable or fault feedback |
| 10 | B2 | Channel 2 reverse output - isolated output for current sense alert or watchdog reset |
| 11 | GNDB | Secondary-side signal ground - reference for B1/B2 outputs and VDDB decoupling |
| 12 | VDDB | Secondary-side signal supply - powered by internal DC-DC; supplies B1/B2 receivers |
| 13 | VSNS | Feedback sense input - connects to resistor divider on secondary side to regulate VDDB |
| 14 | COMP | Compensation node - external R-C network (49.9 kΩ + capacitor) stabilizes DC-DC loop |
| 15 | NC | No connect - internally unconnected; must be left floating or grounded per layout guidelines |
| 16 | GNDP | Primary-side power ground - second GNDP pin for low-inductance transformer return path |
Key Features
| Feature | Design Value |
|---|---|
| RF-based digital isolation | Eliminates magnetic field susceptibility and enables >100 Mbps operation without initialization |
| Integrated flyback DC-DC controller | Reduces BOM count by removing external PWM IC, optocoupler, and bias supply |
| Secondary-side voltage sensing | Enables ±1% load regulation without optocoupler drift or aging effects |
| Dithering and programmable frequency | Allows EMI spread-spectrum tuning (200–800 kHz) to meet CISPR-32 Class B limits |
| AEC-Q100 qualification | Validated for automotive-grade production with PPAP support and IMDS/CAMDS compliance |
Applications
| Motor Control Inverters | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Isolating PWM gate drive signals and current sense feedback in 3-phase IGBT/SiC inverter stacks. IC Role / Device Role / Timing Role: SI88221ED-ASR provides bidirectional signal isolation (A1→B1 for PWM, B2→A2 for fault) while powering gate driver ICs via its 5 V/2 W DC-DC output. Use Value: Enables compact, single-chip isolated power + signal solution replacing discrete isolators + isolated buck converters - reducing PCB area by >40%. |
Use Scenario: Digitally isolating analog input conditioning circuits and digital output drivers in modular PLC backplanes. IC Role / Device Role / Timing Role: SI88221ED-ASR isolates 24 V sensor inputs (A1/A2) and delivers isolated 5 V power (VDDB) to local ADCs and level shifters on the field side. Use Value: Maintains ±0.1% measurement accuracy under 10 kV surge transients due to 100 kV/µs CMTI and reinforced insulation. |
| Onboard EV Chargers | Renewable Energy Inverters |
Use Scenario: Isolating communication between AC/DC PFC controller and DC/DC LLC stage in bi-directional OBC designs. IC Role / Device Role / Timing Role: SI88221ED-ASR transmits isolated UART commands (A1→B1) and status flags (B2→A2), while powering isolated microcontroller on secondary side. Use Value: Supports ASIL-B functional safety architecture via dual-channel redundancy and AEC-Q100 qualification. |
Use Scenario: Signal and power isolation between MPPT controller and grid-tie inverter H-bridge in solar string inverters. IC Role / Device Role / Timing Role: SI88221ED-ASR isolates isolated gate driver enable signals (A1→B1) and delivers 3.3 V/2 W to isolated current sensing ASICs (VDDB). Use Value: Achieves <1 µs propagation skew between channels - critical for synchronous dead-time control in 1700 V SiC half-bridges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel isolated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6223ARWZ | 2-channel isolator + 500 mW DC-DC; lower output power, no soft-start or shutdown pin | Suitable for low-power logic isolation only - cannot drive gate drivers or ADCs requiring >500 mW | Select when system load < 100 mA and EMI dithering is not required. |
| ISO7821FDWR | 2-channel isolator only - no integrated DC-DC; requires external isolated power supply | Requires separate isolated DC/DC (e.g., SN6501 + transformer), increasing BOM and layout complexity | Select when existing isolated power rail exists and highest channel-to-channel CMTI (>100 kV/µs) is mandatory. |
Compared with ADUM6223ARWZ and ISO7821FDWR, SI88221ED-ASR uniquely integrates 2 W isolated power with dual-channel signal isolation, programmable shutdown/soft-start, and automotive qualification - making it optimal for space-constrained, high-reliability motor control and EV applications where board area and safety certification are critical.
Availability
SI88221ED-ASR is available at Aetrix Electronics and suitable for industrial motor control, onboard EV chargers, and renewable energy inverters requiring stable component supply with long-term lifecycle assurance.
Supply support for SI88221ED-ASR 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 Si88x2x family was designed specifically for high-reliability isolated power + signal transfer in automotive and industrial systems - combining digital isolation, integrated DC-DC, and AEC-Q100 qualification in a single SOIC package.
FAQ
What is the maximum continuous output power of the SI88221ED-ASR's integrated DC-DC converter?
The SI88221ED-ASR delivers up to 2 W average output power at 5.0 V (400 mA) under continuous operation at +25 °C ambient. Peak capability reaches 5 W for short durations, but thermal derating applies above 85 °C case temperature. This output powers secondary-side circuitry such as gate drivers, ADCs, or microcontrollers - eliminating need for external isolated DC/DC stages.
Does the SI88221ED-ASR support bidirectional data transmission?
No - the SI88221ED-ASR has two unidirectional channels: A1 and A2 are inputs (primary-to-secondary), while B1 and B2 are outputs (secondary-to-primary). Each channel operates independently, enabling simultaneous forward control and reverse feedback paths - ideal for isolated gate driver enable + fault reporting in motor drives.
Can the SI88221ED-ASR operate with a 24 V input on the primary side?
No - SI88221ED-ASR is designed for low-voltage primary operation (3–5.5 V on VDDP). For 24 V input, Skyworks specifies Si8842x or Si8862x families, which use external FETs and RSN sensing. Attempting 24 V on VDDP will exceed absolute maximum ratings and damage the SI88221ED-ASR.
What is the purpose of the SH pin on the SI88221ED-ASR?
The SH (Shutdown) pin disables the internal DC-DC converter when driven high. It is active-high, requires no external pull-down in standard operation (tied to GND), and introduces no latency - converter halts within 10 µs. This enables safe power sequencing during system fault conditions or standby modes without affecting digital isolation channel operation.
How does the SI88221ED-ASR achieve high CMTI performance of 100 kV/µs?
The SI88221ED-ASR achieves 100 kV/µs typical common-mode transient immunity through its capacitive silicon dioxide isolation barrier and RF-based modulation scheme - which rejects fast dV/dt noise more effectively than pulse-based isolators. Layout adherence (e.g., minimizing GNDP/GNDA loop area) preserves this rating in end-equipment per IEC 61800-3.
SI88221ED-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si88x2x
- Package/Case:
- 16-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:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 40kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 18ns, 23ns
- Pulse Width Distortion (Max):
- 7ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI88221ED-ASR FAQ
1.How can I place an order for SI88221ED-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88221ED-ASR 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 SI88221ED-ASR reliable?
The price and inventory of SI88221ED-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88221ED-ASR is usually 5 days.
3.What payment methods are accepted for SI88221ED-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88221ED-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88221ED-ASR?
SI88221ED-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88221ED-ASR 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 SI88221ED-ASR?
For technical support, including SI88221ED-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88221ED-ASR requirements.
6.How does Aetrix verify that SI88221ED-ASR is sourced from the original manufacturer or authorized distributors?
All SI88221ED-ASR 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 SI88221ED-ASR meets industry standards.
7.What is the process for return or replacement of SI88221ED-ASR?
All SI88221ED-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88221ED-ASR, 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 SI88221ED-ASR part is unused and in its original packaging.
Return procedure for SI88221ED-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88221ED-ASR Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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