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Skyworks Solutions Inc. SI88321EC-ASR
- Part No.:
- SI88321EC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88321EC-ASR.pdf
- Description:
- AUTOMOTIVE 3.75 KV 2-CHANNEL DIG
- Quantity:
- Payment:
- Shipping:
Inventory:3,548
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Product details
Overview
SI88321EC-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 motor control inverters where compact, reinforced-isolated power and signal transfer are required.
For engineers reviewing the SI88321EC-ASR datasheet, SI88321EC-ASR pinout, SI88321EC-ASR application, or SI88321EC-ASR equivalent, this page provides verified functional specifications, SOIC-20WB package details, automotive-grade AEC-Q100 qualification status, and real-world design context for industrial and EV power systems.
Technical Context
The SI88321EC-ASR implements capacitive RF-based digital isolation with on-off keying modulation across a silicon dioxide barrier, enabling robust noise immunity and no-startup initialization. Its integrated flyback DC-DC controller senses output voltage on the secondary side via VSNS and closes the loop using internal error amplification and COMP-pin compensation.
It supports low-voltage input (3–5.5 V) to isolated 3.3/5.0 V output, with programmable soft-start (SS pin), shutdown (SH_FC pin), and frequency tuning (SH_FC/SS RC network). The device uses internal power switches (VSW) and requires only an external transformer, Schottky diode, and minimal passive components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - meets UL 1577, CSA 62368-1, VDE 62368-1 reinforced insulation requirements |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and PWM feedback loops |
| Propagation Delay | 23 ns max - enables precise timing-critical applications such as gate driver signaling and current sensing synchronization |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power isolated microcontrollers, ADCs, or gate drivers without external regulators |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial motor drive environments |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev G - supports PPAP documentation and IMDS/CAMDS compliance for automotive OEM programs |
| Transient Immunity | 100 kV/µs typical - ensures reliable operation in high-noise inverter and PLC I/O modules |
Pinout & Package
SI88321EC-ASR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 15.4 mm, 1.27 mm pitch) with creepage/clearance ≥8.3 mm, certified for reinforced insulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | GNDP, VSW, VDDP, VDDA, GNDA, SH_FC | Primary-side ground, internal switch output, primary power input, signal supply, signal ground, shutdown/frequency control |
| 7, 8, 9, 10 | HF XMTR, HF RCVR, HF XMTR, HF RCVR | RF transmitter/receiver pairs for Channel 1 and Channel 2 forward paths |
| 11, 12, 13, 14 | A1, A2, B1, B2 | CMOS digital inputs (Side A) and outputs (Side B); unidirectional, 3.3/5 V logic compatible |
| 15, 16, 17, 18, 19, 20 | GNDB, VDDB, NC, VSNS, COMP, NC | Secondary-side ground, isolated signal supply, no-connect, feedback sense, compensation network, no-connect |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC with secondary-side sensing | Eliminates optocouplers and external bias circuitry; improves load regulation and long-term reliability |
| Programmable soft-start (SS pin) | Reduces inrush current during power-up; prevents transformer saturation and system brownouts |
| Shutdown control (SH_FC pin) | Allows system-level power sequencing and fault recovery without removing primary supply |
| Capacitive RF isolation architecture | Provides >100 kV/µs CMTI and immunity to magnetic fields-superior to opto- and transformer-based isolators |
| SOIC-20WB package with 5 kVRMS rating | Enables compact PCB layout while meeting reinforced insulation standards for industrial safety compliance |
Applications
| Motor Control Inverter | Industrial PLC I/O Module |
|---|---|
Use Scenario: Isolating gate driver signals and feedback from high-voltage DC bus in 3-phase inverters. IC Role / Device Role / Timing Role: SI88321EC-ASR provides isolated power (VDDB) and bidirectional signal isolation (A1/A2 → B1/B2) for IGBT/SiC gate drivers and current-sense ADCs. Use Value: Enables single-chip isolated power + signal transfer, reducing BOM count and eliminating discrete DC-DC + optocoupler combinations. |
Use Scenario: Digitally isolating field-side analog/digital I/O in distributed control cabinets exposed to EMI. IC Role / Device Role / Timing Role: SI88321EC-ASR delivers isolated 5 V for sensor front-ends and isolates digital control lines between CPU and I/O expansion cards. Use Value: Meets IEC 61000-4-5 surge immunity and reinforced insulation requirements while supporting hot-swap-capable modular designs. |
| Onboard Charger (OBC) | EV Battery Management System (BMS) |
Use Scenario: Signal and power isolation between AC/DC stage control and DC/DC stage in bidirectional OBCs. IC Role / Device Role / Timing Role: SI88321EC-ASR powers isolated MCU peripherals and transfers PWM commands and fault signals across the isolation barrier. Use Value: Supports AEC-Q100 qualification and 125 °C operation needed for under-hood automotive charging systems. |
Use Scenario: Isolating cell voltage monitoring ICs and balancing FET drivers from the main BMS controller. IC Role / Device Role / Timing Role: SI88321EC-ASR supplies isolated 3.3 V to precision ADCs and isolates digital communication (e.g., daisy-chain UART) between battery modules. Use Value: Provides 5 kVRMS isolation and 100 kV/µs CMTI to withstand high dv/dt transients during contactor switching in 800 V battery packs. |
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 |
|---|---|---|---|
| ADUM6210ARWZ | 2-channel isolator + 500 mW isolated DC-DC; SOIC-16WB; 2.5 kVRMS rating | Limited to lower power loads; not AEC-Q100 qualified; lacks programmable frequency/soft-start | Select when board space is constrained and <500 mW isolated power suffices; verify creepage for safety-critical use. |
| ISO7821FDWWR | Dual-channel isolator only (no DC-DC); SOIC-16WB; 8000 VRMS; 100 Mbps; 11 ns prop delay | Requires external isolated DC-DC; higher isolation rating but adds complexity and cost | Select when maximum isolation strength (>5 kVRMS) and ultra-low propagation delay are mandatory, and external DC-DC is acceptable. |
Compared with ADUM6210ARWZ and ISO7821FDWWR, the SI88321EC-ASR uniquely integrates 2 W isolated power, AEC-Q100 qualification, and programmable soft-start/shutdown in a single SOIC-20WB package-reducing system-level component count and qualification effort for automotive and industrial inverters.
Availability
SI88321EC-ASR is available at Aetrix Electronics and suitable for motor control inverters, industrial PLC I/O modules, and EV onboard chargers requiring stable component supply, automotive-grade reliability, and reinforced isolation certification.
Supply support for SI88321EC-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 SI88321EC-ASR belongs to the Si88x2x family of integrated digital isolators with on-chip DC-DC converters, designed specifically for high-reliability industrial automation and automotive electrification systems demanding compact, certified, and self-powered isolation.
FAQ
What is the maximum isolated output power supported by the SI88321EC-ASR?
The SI88321EC-ASR delivers up to 2 W of average isolated output power at 5.0 V, sufficient to power isolated microcontrollers, ADCs, or gate drivers. Peak power capability reaches 5 W, but sustained operation is rated at 2 W due to thermal limits in the SOIC-20WB package. This specification is validated per the Si883xx design guide AN892 and applies to standard 3–5.5 V input configurations.
Does the SI88321EC-ASR support AEC-Q100 qualification for automotive use?
Yes, the SI88321EC-ASR is AEC-Q100 qualified (Grade 0, –40 °C to +125 °C), with full AIAG-compliant PPAP documentation support and IMDS/CAMDS listing. It is manufactured using automotive-specific process flows and tested for defectivity and robustness required in EV traction inverters and onboard chargers.
How does the SI88321EC-ASR achieve isolated DC-DC regulation without optocouplers?
The SI88321EC-ASR uses secondary-side voltage sensing via the VSNS pin and encodes the error signal across the capacitive isolation barrier to the primary-side controller. This eliminates external optocouplers and their associated bias circuitry, improving line/load regulation and long-term reliability compared to traditional isolated DC-DC topologies.
What transformer is recommended for use with the SI88321EC-ASR in a 5 V input to 5 V output configuration?
Skyworks validates the Coilcraft TA7618-AL and UMEC UTB02240s transformers for 5 V input to 5 V output with the SI88321EC-ASR. Both provide 1:4 turns ratio, ≤64 nH leakage inductance, 2 µH ±5% primary inductance, and 5 kVRMS isolation-ensuring stable regulation, low EMI, and compliance with reinforced insulation standards.
Can the SI88321EC-ASR be used in high-voltage input configurations (e.g., 24 V to 5 V)?
No-the SI88321EC-ASR is designed exclusively for low-voltage input (3–5.5 V) to isolated 3.3/5.0 V output. For 24 V input applications, Skyworks specifies the Si8842x or Si8862x families, which feature external switch drivers (ESW), current sense (RSN), and different pinouts. Using SI88321EC-ASR with >5.5 V input risks damage and invalidates safety certifications.
SI88321EC-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si88x2x
- Package/Case:
- 20-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:
- 20-SOIC
SI88321EC-ASR FAQ
1.How can I place an order for SI88321EC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88321EC-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 SI88321EC-ASR reliable?
The price and inventory of SI88321EC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88321EC-ASR is usually 5 days.
3.What payment methods are accepted for SI88321EC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88321EC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88321EC-ASR?
SI88321EC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88321EC-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 SI88321EC-ASR?
For technical support, including SI88321EC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88321EC-ASR requirements.
6.How does Aetrix verify that SI88321EC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88321EC-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 SI88321EC-ASR meets industry standards.
7.What is the process for return or replacement of SI88321EC-ASR?
All SI88321EC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88321EC-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 SI88321EC-ASR part is unused and in its original packaging.
Return procedure for SI88321EC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88321EC-ASR Tags
-
ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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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
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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