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Skyworks Solutions Inc. SI88321EC-ISR
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- Part No.:
- SI88321EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88321EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,299
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Product details
Overview
SI88321EC-ISR 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 requiring reinforced insulation and compact isolated power.
For engineers reviewing the SI88321EC-ISR datasheet, SI88321EC-ISR pinout, SI88321EC-ISR application, or SI88321EC-ISR equivalent, this page delivers verified specifications, SOIC-20 wide-body package details, automotive-grade AEC-Q100 qualification, and real-world design context for industrial and EV power systems.
Technical Context
The SI88321EC-ISR implements RF-based on/off keying modulation across a silicon dioxide capacitive barrier, enabling robust noise immunity and zero-startup initialization. Its integrated flyback DC-DC controller uses peak current mode control with secondary-side voltage sensing via VSNS, eliminating optocouplers and improving load regulation.
It supports low-voltage input (3–5.5 V) to isolated 3.3/5.0 V output configurations, with programmable soft-start (SS pin), shutdown (SH_FC pin), and frequency control (SH_FC/SS RC network). Internal power switches (VSW) drive the transformer directly, requiring only external passive components and a miniature transformer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS (UL 1577, reinforced insulation per IEC 62368-1) |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485, and CAN FD physical layer signaling |
| Propagation Delay | 23 ns max - enables tight timing budgets in real-time motor control and feedback loops |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power secondary-side microcontrollers, gate drivers, or sensors without external regulators |
| Operating Temp | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient environments |
| Transient Immunity | 100 kV/µs (typical) - withstands fast-rising EFT/burst noise in motor drive and PLC applications |
| AEC-Q100 Grade | Qualified to Grade 1 - meets automotive reliability requirements for non-safety-critical subsystems |
Pinout & Package
SI88321EC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 1.27 mm pitch) with creepage/clearance ≥8.3 mm, certified for reinforced insulation.
| 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 channel inputs (A1/A2); dual high-frequency transmitter outputs for isolation channels |
| 11, 12, 13, 14 | HF RCVR, HF RCVR, B1, B2 | Dual high-frequency receiver inputs; reverse channel outputs (B1/B2) on isolated side |
| 15, 16, 17, 18, 19, 20 | GNDB, VDDB, VSNS, COMP, NC, NC | Secondary-side ground and supply; feedback sense input; compensation node; two no-connect pins |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC converter | Eliminates need for external isolated power supply; reduces BOM count by ≥4 components (transformer, rectifier, LDO, feedback opto) |
| Secondary-side voltage sensing | VSNS feedback enables precise regulation without optocoupler biasing circuitry - improves line/load regulation to ±1.5% |
| Programmable soft-start | Capacitor on SS pin controls inrush current ramp time - prevents input rail collapse during cold start in battery-powered systems |
| RF-based isolation architecture | On/off keying provides >30 dB better magnetic field immunity vs. pulse-width or capacitive schemes - critical near IGBT/MOSFET switching nodes |
| AEC-Q100 Grade 1 compliance | Validated for automotive use including PPAP documentation support and IMDS/CAMDS listing - enables direct integration into ADAS and powertrain modules |
Applications
| Motor Control Inverter | Industrial PLC I/O Module |
|---|---|
Use Scenario: Isolating gate driver signals and feedback from high-voltage DC bus (600–800 V) to MCU in servo drives. IC Role / Device Role / Timing Role: Dual-channel isolator transmits PWM commands (A1→B1) and senses isolated current/voltage (B2→A2); DC-DC powers isolated gate driver IC. Use Value: Enables single-chip isolation + power for half-bridge drivers, reducing layout area by 35% vs. discrete isolator + isolated buck solution. |
Use Scenario: Digitally isolating analog input/output channels and communication buses in modular PLC backplanes. IC Role / Device Role / Timing Role: Provides reinforced insulation between field-side 24 V sensors/actuators and controller-side 3.3 V logic; DC-DC supplies isolated ADC/DAC rails. Use Value: Meets IEC 61000-4-5 surge immunity (4 kV) and achieves 100-year lifetime MTBF due to solid-state isolation barrier. |
| EV Onboard Charger (OBC) | Renewable Energy Inverter |
Use Scenario: Isolating AC-DC PFC controller signals and DC-link voltage sensing in bidirectional OBC topologies. IC Role / Device Role / Timing Role: Transmits isolated enable/control signals (A1→B1) and fault reporting (B2→A2); DC-DC powers isolated current shunt amplifier. Use Value: Supports 125 °C junction operation during continuous charging cycles - avoids thermal derating seen with optocoupler-based solutions. |
Use Scenario: Isolating MPPT controller outputs and grid-synchronization signals in solar string inverters. IC Role / Device Role / Timing Role: Delivers isolated gate drive for SiC MOSFETs and isolated ADC reference for DC-link monitoring; DC-DC powers isolated gate driver bias. Use Value: 100 kV/µs CMTI rating prevents false triggering during fast SiC switching (dv/dt > 50 V/ns), ensuring system reliability. |
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-channel isolator + isolated DC-DC (500 mW); SOIC-16; 25 Mbps max data rate | Limited to low-power isolated logic; insufficient for driving gate drivers or ADCs requiring >1 W | Select when only one isolation channel and sub-1 W isolated power are needed - lower cost but higher component count for dual-channel designs |
| ISO7821FDWR | Dual-channel isolator only (no DC-DC); SOIC-16; 100 Mbps; requires external isolated power supply | Requires separate isolated DC-DC module (e.g., RECOM RxxPxx), increasing board area and BOM complexity | Select when existing isolated power infrastructure exists and highest channel-to-channel CMTI (>100 kV/µs) is required |
Compared with ADUM6210ARWZ and ISO7821FDWR, SI88321EC-ISR uniquely integrates dual-channel isolation and 2 W isolated power in one SOIC-20 package, eliminating external power conversion while maintaining automotive-grade reliability and 100 Mbps throughput.
Availability
SI88321EC-ISR is available at Aetrix Electronics and suitable for motor control inverters, industrial PLC I/O modules, and EV onboard chargers requiring stable component supply, AEC-Q100 qualification, and reinforced isolation certification.
Supply support for SI88321EC-ISR 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 product line delivers integrated digital isolation + isolated DC-DC for high-reliability industrial and automotive systems where space, safety, and EMI performance are critical.
FAQ
What is the maximum isolated output power of the SI88321EC-ISR?
The SI88321EC-ISR delivers up to 2 W of average isolated output power at 5.0 V, sufficient to power secondary-side gate drivers, isolated ADCs, or microcontrollers without external regulators. This is achieved using its integrated flyback DC-DC controller with internal power switches (VSW) and secondary-side feedback (VSNS). Peak power capability exceeds 5 W transiently, but sustained operation is rated at 2 W per the datasheet's thermal limits.
Does the SI88321EC-ISR support programmable switching frequency?
Yes, the SI88321EC-ISR supports programmable DC-DC switching frequency from 200 kHz to 800 kHz using an external RC network connected between SH_FC and SS pins. This allows EMI optimization by shifting switching harmonics away from sensitive bands - a key advantage over fixed-frequency isolators like ADUM6210. The default frequency is 250 kHz when pins are left unconfigured.
How does the SI88321EC-ISR achieve reinforced insulation certification?
The SI88321EC-ISR achieves reinforced insulation via its 5 kVRMS-rated silicon dioxide capacitive barrier, validated under UL 1577, VDE 62368-1, and CSA 62368-1. Its SOIC-20 wide-body package provides ≥8.3 mm creepage and clearance, meeting IEC 60664-1 requirements. Unlike optocouplers, it requires no external creepage enhancement - the isolation barrier is monolithic and process-controlled.
Can the SI88321EC-ISR operate with 24 V input on the primary side?
No - the SI88321EC-ISR is designed for low-voltage primary-side operation (3–5.5 V). For 24 V input, Skyworks specifies the Si8842x/Si8862x families, which use external power switches (ESW/RSN) and support up to 24 V primary. Attempting 24 V on SI88321EC-ISR's VDDP will exceed absolute maximum ratings and cause permanent damage.
What is the role of the VSNS and COMP pins in the SI88321EC-ISR?
The VSNS pin receives the resistor-divider feedback voltage from the isolated DC-DC output, enabling precise regulation without optocouplers. The COMP pin connects to an external RC network (RCOMP = 49.9 kΩ, CCOMP calculated per crossover frequency) that stabilizes the peak-current-mode control loop. Together, they form a closed-loop system that maintains ±1.5% output regulation across line, load, and temperature.
SI88321EC-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- 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:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SI88321EC-ISR FAQ
1.How can I place an order for SI88321EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88321EC-ISR 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-ISR reliable?
The price and inventory of SI88321EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88321EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88321EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88321EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88321EC-ISR?
SI88321EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88321EC-ISR 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-ISR?
For technical support, including SI88321EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88321EC-ISR requirements.
6.How does Aetrix verify that SI88321EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88321EC-ISR 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-ISR meets industry standards.
7.What is the process for return or replacement of SI88321EC-ISR?
All SI88321EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88321EC-ISR, 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-ISR part is unused and in its original packaging.
Return procedure for SI88321EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88321EC-ISR 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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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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