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Skyworks Solutions Inc. SI88321BC-ASR
- Part No.:
- SI88321BC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88321BC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:2,272
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Product details
Overview
SI88321BC-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 reinforced 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 in industrial and automotive systems requiring galvanic separation and local isolated power.
For engineers reviewing the SI88321BC-ASR datasheet, SI88321BC-ASR pinout, SI88321BC-ASR application, or SI88321BC-ASR equivalent, this device serves as a complete signal + power isolation solution for motor control gate drivers, PLC I/O modules, and EV battery management systems where compact size, high CMTI (>100 kV/µs), and AEC-Q100 qualification are critical selection criteria.
Technical Context
The SI88321BC-ASR implements RF-based on/off keying modulation across a silicon dioxide capacitive barrier for robust noise immunity and zero initialization latency. Its digital isolator side uses independent UVLO monitors per side (VDDA/VDDP and VDDB) with fail-safe low default outputs during undervoltage conditions.
The integrated flyback DC-DC controller operates in peak current mode with closed-loop feedback via VSNS, COMP, and internal error amplifier. It supports soft-start (SS pin), shutdown (SH_FC pin), and programmable switching frequency (200–800 kHz) using external RC on SH_FC/SS - all confirmed for Si883xx family including SI88321BC-ASR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute (UL 1577, VDE 62368-1, CSA 62368-1) |
| Data Rate | Up to 100 Mbps - enables high-speed serial interfaces like SPI, RS-485, and CAN FD without timing bottlenecks |
| 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 microcontrollers, ADCs, or gate drivers without external regulators |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient environments |
| CMTI | 100 kV/µs typical - prevents false triggering in high-dv/dt motor drive and inverter applications |
| AEC-Q100 Grade | Qualified - meets automotive reliability requirements for ECU, BMS, and traction inverter subsystems |
Pinout & Package
SI88321BC-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, supporting reinforced insulation per IEC 62368-1.
| Pin | 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 | A1, A2, HF XMTR, HF XMTR | Forward digital channel inputs (A1/A2); dedicated RF transmitters for each channel |
| 11, 12, 13, 14 | HF RCVR, HF RCVR, B1, B2 | Dedicated RF receivers; isolated digital outputs (B1/B2) referenced to VDDB/GNDB |
| 15, 16, 17, 18, 19, 20 | GNDB, VDDB, NC, VSNS, COMP, NC | Secondary-side ground and supply; no-connect pins; feedback sense input; compensation node for loop stability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC with secondary-side sensing | Eliminates optocouplers and external feedback components - improves line/load regulation and long-term reliability |
| Programmable soft-start (SS pin) | External capacitor sets startup ramp time - prevents inrush current damage to transformer and downstream loads |
| RF-based isolation architecture | No clock/data recovery circuitry required - zero-latency operation and immunity to magnetic fields up to 100 kV/µs |
| Fail-safe output default | Outputs held low during UVLO or power loss - ensures safe state in motor control and safety-critical I/O |
| Automotive-grade manufacturing flow | Full AEC-Q100 qualification with PPAP documentation support - suitable for ASIL-B system integration |
Applications
| Motor Control Gate Driver Isolation | PLC Digital I/O Module |
|---|---|
Use Scenario: Isolating PWM signals and fault feedback between MCU and 600 V IGBT/MOSFET half-bridge drivers in servo drives. IC Role / Device Role / Timing Role: Provides bidirectional signal isolation (A1→B1, A2→B2) and powers gate driver ICs via integrated 5 V/2 W DC-DC output. Use Value: Enables single-chip isolation + power, reducing BOM count and PCB area vs. discrete isolator + isolated buck converter. |
Use Scenario: Digitally isolating 24 V field-side digital inputs/outputs from 3.3 V controller-side logic in modular PLC backplanes. IC Role / Device Role / Timing Role: Dual-channel isolator with fail-safe low outputs during brownout; powers isolated I/O ASICs from VDDB rail. Use Value: Meets IEC 61000-4-5 surge immunity requirements while eliminating external isolated bias supplies. |
| Battery Management System (BMS) Cell Monitoring | EV Onboard Charger (OBC) Control Interface |
Use Scenario: Isolating voltage/current measurement data from high-voltage battery stack (up to 1000 V) to MCU in traction battery packs. IC Role / Device Role / Timing Role: Transmits isolated analog-to-digital interface signals (e.g., SPI clock/data) with <23 ns skew between channels. Use Value: Supports precise cell balancing timing synchronization across 96+ series cells with minimal propagation delay mismatch. |
Use Scenario: Isolating AC-DC PFC and DC-DC LLC control signals between primary-side HV controller and secondary-side 12 V MCU in 6.6 kW OBCs. IC Role / Device Role / Timing Role: Delivers isolated 5 V power to secondary-side MCU while transmitting gate drive enable/fault signals. Use Value: Replaces optocoupler + isolated DC/DC combo - reduces thermal derating risk and improves startup reliability at –40 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel isolated power + signal applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6210ARWZ | 2-channel isolator + 500 mW isolated DC-DC; 50 Mbps max; SOIC-16; no programmable frequency or soft-start | Limited to low-power secondary-side logic; insufficient for driving gate drivers or ADCs requiring >1 W | Select when only basic isolation + low-power bias is needed and footprint constraints favor SOIC-16 |
| ISO7821FDWWR | 2-channel isolator only (no DC-DC); 100 Mbps; SOIC-16; requires external isolated power supply | Increases BOM cost and layout complexity due to need for separate isolated DC/DC converter and transformer | Select when system already includes an isolated power rail and only signal integrity and CMTI are prioritized |
Compared with ADUM6210ARWZ and ISO7821FDWWR, the SI88321BC-ASR uniquely integrates 2 W isolated power with 100 Mbps dual-channel isolation in SOIC-20, enabling single-component solutions for space-constrained automotive and industrial control where both signal fidelity and local power delivery are mandatory.
Availability
SI88321BC-ASR is available at Aetrix Electronics and suitable for motor control gate drivers, PLC I/O modules, battery management systems, and EV onboard chargers requiring stable component supply across extended temperature and automotive lifecycle demands.
Supply support for SI88321BC-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 for wireless, automotive, and industrial markets.
The SI88321BC-ASR belongs to Skyworks' Si88x2x family of integrated digital isolators with on-chip DC-DC converters, designed specifically for applications demanding simultaneous signal isolation and local isolated power in harsh environments.
FAQ
What is the maximum isolated DC-DC output power of the SI88321BC-ASR?
The SI88321BC-ASR delivers up to 2 W average output power at 5.0 V on the isolated side. This is sufficient to power secondary-side microcontrollers, gate drivers, or precision ADCs without requiring additional isolated DC/DC stages. Peak power capability exceeds 5 W transiently, but sustained operation is rated at 2 W under thermal limits specified in the datasheet.
Does the SI88321BC-ASR support fail-safe output behavior during power loss?
Yes, the SI88321BC-ASR implements fail-safe low default outputs. When either VDDA or VDDB falls below its respective UVLO threshold, the corresponding isolation channel outputs (B1/B2) are actively driven low. This behavior is inherent to the device architecture and requires no external configuration - a critical safety feature for motor control and industrial I/O.
Can the SI88321BC-ASR be used in automotive applications?
Yes, the SI88321BC-ASR is AEC-Q100 qualified and manufactured using automotive-specific process flows. It supports operation from –40 °C to +125 °C, includes AIAG-compliant PPAP documentation, and meets reinforced insulation requirements per VDE 62368-1 - making it suitable for BMS, traction inverter control, and ADAS domain controllers.
What transformer is recommended for use with the SI88321BC-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 SI88321BC-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.
How is the switching frequency programmed on the SI88321BC-ASR?
The SI88321BC-ASR allows programmable PWM frequency from 200 kHz to 800 kHz using an external RC network connected between SH_FC and SS pins. The frequency is set by the time constant of this network, as defined in AN892. Unlike Si882xx devices, Si883xx (including SI88321BC-ASR) supports this user-adjustable feature to optimize EMI performance for specific board layouts.
SI88321BC-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
SI88321BC-ASR FAQ
1.How can I place an order for SI88321BC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88321BC-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 SI88321BC-ASR reliable?
The price and inventory of SI88321BC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88321BC-ASR is usually 5 days.
3.What payment methods are accepted for SI88321BC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88321BC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88321BC-ASR?
SI88321BC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88321BC-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 SI88321BC-ASR?
For technical support, including SI88321BC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88321BC-ASR requirements.
6.How does Aetrix verify that SI88321BC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88321BC-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 SI88321BC-ASR meets industry standards.
7.What is the process for return or replacement of SI88321BC-ASR?
All SI88321BC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88321BC-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 SI88321BC-ASR part is unused and in its original packaging.
Return procedure for SI88321BC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88321BC-ASR Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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