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Skyworks Solutions Inc. SI88321BD-ASR
- Part No.:
- SI88321BD-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88321BD-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:4,198
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Product details
Overview
SI88321BD-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 galvanic separation of gate drive signals and auxiliary supply is required.
For engineers reviewing the SI88321BD-ASR datasheet, SI88321BD-ASR pinout, SI88321BD-ASR application, or SI88321BD-ASR equivalent, this page provides verified specifications, SOIC-20W package details, automotive-grade AEC-Q100 qualification, safety certifications (UL, VDE, CSA, CQC), and real-world design context for isolated power and signal transfer in high-noise industrial and EV systems.
Technical Context
The SI88321BD-ASR implements RF-based on/off keying modulation across a silicon dioxide capacitive barrier for noise-immune digital isolation. Its integrated flyback DC-DC controller operates in peak current mode, senses output voltage on the secondary side via VSNS, and transmits error feedback across the barrier without optocouplers.
It supports low-voltage input (3–5.5 V) to 3.3/5.0 V output configurations, includes programmable soft-start (SS pin), shutdown (SH_FC pin), and adjustable switching frequency (200–800 kHz via SH_FC/SS RC network). Thermal shutdown and cycle-skipping at light loads enhance reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - enables reinforced insulation per UL 1577, CSA 62368-1, VDE 62368-1 |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485, and PWM timing in motor drives |
| Propagation Delay | 23 ns max - ensures tight timing alignment between isolated control and feedback paths |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power isolated gate drivers and microcontrollers without external regulators |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient conditions |
| Transient Immunity | 100 kV/µs typical - maintains signal integrity during fast-switching IGBT/MOSFET commutation events |
| AEC-Q100 Grade | Qualified - meets automotive reliability requirements including HTOL, TC, and ESD testing |
Pinout & Package
SI88321BD-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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 15, 16, 17, 18 | GNDP, VSW, VDDP, VDDA, GNDA, GNDB, VDDB, NC, VSNS, COMP | Primary-side ground/power, internal switch output, primary/secondary supply rails, secondary-side ground/supply, feedback input, and compensation node for closed-loop DC-DC regulation |
| 7, 8, 13, 14 | A1, A2, B1, B2 | Unidirectional digital channel I/O: A1/A2 transmit from primary to secondary; B1/B2 receive from secondary to primary |
| 9, 10, 11, 12 | HF XMTR / HF RCVR pairs | RF carrier transmitter/receiver circuitry enabling capacitive isolation - no external clock or initialization required |
| 19, 20 | SH_FC, SS | Shutdown/frequency control and soft-start pins - enable safe power sequencing and EMI optimization via external RC |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC with secondary-side sensing | Eliminates optocoupler biasing circuitry and improves load regulation by >3× vs transformer-only designs |
| RF-based isolation architecture | Delivers 100 kV/µs common-mode transient immunity and immunity to magnetic fields - critical for inverter gate drive isolation |
| Programmable soft-start and shutdown | Prevents inrush current damage and enables system-level power sequencing control via SH_FC and SS pins |
| Automotive-grade qualification | AEC-Q100 qualified with PPAP support and IMDS/CAMDS compliance - suitable for ASIL-B functional safety subsystems |
| SOIC-20W reinforced insulation | 8.3 mm creepage/clearance meets IEC 60664-1 for 5000 VRMS working voltage - reduces PCB area vs discrete isolator + regulator solutions |
Applications
| Motor Control Inverters | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Isolating gate driver control signals and feedback from high-voltage DC bus in 3-phase motor drives. IC Role / Device Role / Timing Role: Provides bidirectional signal isolation (A→B for PWM, B→A for fault reporting) and powers isolated gate driver ICs from the primary-side 5 V rail. Use Value: Enables compact, single-chip isolated power + signal solution with <23 ns timing skew - critical for synchronous IGBT switching and overcurrent response. |
Use Scenario: Digitally isolating analog input/output channels and fieldbus communication in distributed control cabinets. IC Role / Device Role / Timing Role: Delivers isolated 5 V power to ADC front-ends and isolates RS-485 transceiver control lines while maintaining 100 Mbps data throughput. Use Value: Reduces component count by replacing separate isolators and isolated DC-DC modules - lowers BOM cost and improves long-term reliability in harsh factory environments. |
| Onboard EV Chargers | Renewable Energy Inverters |
Use Scenario: Isolating MCU control signals and powering isolated sensing circuits in AC/DC and DC/DC stages of bidirectional OBCs. IC Role / Device Role / Timing Role: Supplies regulated 5 V to isolated current/voltage sensors and isolates CAN FD command signals between primary and secondary controllers. Use Value: Supports AEC-Q100 automotive qualification and –40 °C to +125 °C operation - meets OEM thermal and safety requirements for under-hood deployment. |
Use Scenario: Galvanically separating MPPT controller logic from high-voltage PV string monitoring and grid-synchronization circuits. IC Role / Device Role / Timing Role: Powers isolated voltage dividers and isolates fast digital status signals (e.g., anti-islanding detection flags) across the 1000 V+ DC link. Use Value: Achieves 5000 VRMS isolation rating and 100 kV/µs CMTI - prevents false triggering during lightning-induced transients in outdoor solar installations. |
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 | Single isolated power channel (500 mW), 25 Mbps data rate, SOIC-16 package, no programmable frequency or soft-start | Limited to low-power sensor interfaces; insufficient for gate driver supply or high-speed control loops | Select when only basic isolation and <1 W auxiliary power are needed - not suitable for motor control or automotive use |
| ISO7821FDWR | No integrated DC-DC; requires external isolated power supply; 100 Mbps, 11 ns prop delay, SOIC-16 | Increases BOM count and layout complexity; lacks self-contained power capability | Choose when system already provides isolated 5 V and maximum timing precision is prioritized over integration |
Compared with ADUM6210ARWZ and ISO7821FDWR, SI88321BD-ASR uniquely combines 2 W isolated power, 100 Mbps signaling, AEC-Q100 qualification, and programmable DC-DC control in one SOIC-20W package - making it the only drop-in solution for space-constrained, high-reliability automotive and industrial inverter designs requiring both signal and power isolation.
Availability
SI88321BD-ASR is available at Aetrix Electronics and suitable for motor control inverters, onboard EV chargers, industrial PLC I/O modules, and renewable energy inverters requiring stable component supply with automotive-grade traceability and long-lifecycle support.
Supply support for SI88321BD-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 Si88x2x product line delivers integrated digital isolation + isolated DC-DC conversion for high-noise, safety-critical applications such as electric vehicle powertrain control, industrial automation, and smart grid infrastructure - eliminating discrete optocoupler and isolated supply designs.
FAQ
What is the maximum isolated DC-DC output power of the SI88321BD-ASR?
The SI88321BD-ASR delivers up to 2 W of average isolated output power at 5.0 V. This is sufficient to power isolated gate drivers, ADC references, and microcontroller peripherals on the secondary side without requiring additional regulators. Peak power capability exceeds 5 W briefly during startup, but sustained operation is rated at 2 W under thermal limits specified in the datasheet.
Does the SI88321BD-ASR support AEC-Q100 qualification?
Yes, the SI88321BD-ASR is AEC-Q100 qualified for automotive applications. It undergoes stress testing including high-temperature operating life (HTOL), temperature cycling (TC), and electrostatic discharge (ESD) per AEC-Q100 Rev H. Full PPAP documentation, IMDS, and CAMDS listings are supported for automotive OEM programs.
How does the SI88321BD-ASR achieve secondary-side voltage regulation without optocouplers?
The SI88321BD-ASR uses an internal feedback path that encodes the voltage error sensed at the VSNS pin on the secondary side and transmits it across the isolation barrier to the primary-side DC-DC controller. This eliminates the need for external optocouplers and their associated biasing circuitry, improving long-term stability and reducing component count.
What are the key differences between SI88321BD-ASR and SI88221BD-ASR?
The SI88321BD-ASR uses a SOIC-20W package with SH_FC and SS pins for programmable frequency and soft-start, while the SI88221BD-ASR uses SOIC-16W and lacks those features. SI88321BD-ASR supports higher output power (2 W vs 1.5 W), includes enhanced thermal protection, and offers improved EMI performance via dithering - confirmed in Skyworks AN892 design guide.
Can the SI88321BD-ASR be used for 24 V input to 5 V isolated output?
No - the SI88321BD-ASR is designed for low-voltage input (3–5.5 V) to 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 inputs (RSN), and VREGA/VREGB pins to support higher primary-side voltages.
SI88321BD-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
SI88321BD-ASR FAQ
1.How can I place an order for SI88321BD-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88321BD-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 SI88321BD-ASR reliable?
The price and inventory of SI88321BD-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88321BD-ASR is usually 5 days.
3.What payment methods are accepted for SI88321BD-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88321BD-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88321BD-ASR?
SI88321BD-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88321BD-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 SI88321BD-ASR?
For technical support, including SI88321BD-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88321BD-ASR requirements.
6.How does Aetrix verify that SI88321BD-ASR is sourced from the original manufacturer or authorized distributors?
All SI88321BD-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 SI88321BD-ASR meets industry standards.
7.What is the process for return or replacement of SI88321BD-ASR?
All SI88321BD-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88321BD-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 SI88321BD-ASR part is unused and in its original packaging.
Return procedure for SI88321BD-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88321BD-ASR Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
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
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ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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