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Skyworks Solutions Inc. SI88321ED-ASR
- Part No.:
- SI88321ED-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88321ED-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:4,659
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Product details
Overview
SI88321ED-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 requiring reinforced insulation and compact isolated power.
For engineers reviewing the SI88321ED-ASR datasheet, SI88321ED-ASR pinout, SI88321ED-ASR application, or SI88321ED-ASR equivalent, this page provides verified specifications, SOIC-20 wide-body package mapping, functional pin roles, automotive-grade AEC-Q100 qualification, and real-world design context for industrial and EV power systems.
Technical Context
The SI88321ED-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 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 (3–5.5 V) to 3.3/5.0 V output configurations, includes programmable soft-start (SS pin), shutdown (SH_FC pin), and frequency control (SH_FC/SS RC network), and requires only an external transformer, Schottky diode, and minimal passive components for full operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - meets UL 1577, VDE 62368-1, CSA 62368-1 reinforced insulation requirements |
| Data Rate | Up to 100 Mbps - enables high-speed serial communication in motor gate drivers and PLC backplanes |
| 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 logic and small gate drivers 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 - withstands fast-rising common-mode noise in inverter switching environments |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev G - supports PPAP documentation and IMDS/CAMDS compliance for automotive OEMs |
Pinout & Package
SI88321ED-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 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 supply, signal VDD, 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 digital isolation paths |
| 11, 12, 13, 14 | A1, A2, B1, B2 | Primary-side input (A1/A2) and secondary-side output (B1/B2) CMOS I/O terminals |
| 15, 16, 17, 18, 19, 20 | GNDB, VDDB, NC, VSNS, COMP, NC | Secondary ground, secondary VDD, no-connect, feedback sense, compensation node, no-connect |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC converter | Regulated 3.3/5.0 V output with secondary-side sensing eliminates optocouplers and improves load regulation |
| Programmable soft-start | External capacitor on SS pin controls inrush current during power-up, preventing system brownouts |
| Shutdown & frequency control | Single SH_FC pin enables converter disable and 200–800 kHz PWM frequency tuning via RC network |
| High EMI immunity | Dithered switching and RF modulation architecture achieves ultra-low emissions (<10 dBμV/m @ 30–1000 MHz) |
| Automotive-grade flow | Manufactured with AIAG-compliant PPAP, IMDS/CAMDS support, and zero-defect screening for safety-critical applications |
Applications
| Motor Control Inverters | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Isolating gate drive signals and feedback from high-voltage IGBT/SiC half-bridges in servo drives and traction inverters. IC Role / Device Role / Timing Role: Dual-channel isolator providing independent forward (A→B) signal paths for PWM and fault reporting, with integrated 5 V/2 W supply for secondary-side gate driver bias. Use Value: Eliminates need for separate isolated DC-DC converter and reduces BOM count by 3–4 components while maintaining 5 kVRMS reinforced insulation. |
Use Scenario: Digitally isolating analog input/output and digital I/O between field-side sensors/actuators and controller CPU in distributed control cabinets. IC Role / Device Role / Timing Role: Provides galvanic separation for 24 V DC field bus interfaces and powers isolated ADC/DAC reference supplies via its regulated 3.3 V output. Use Value: Enables single-chip isolation + power solution compliant with IEC 61000-4-5 surge immunity and IEC 61800-5-1 motor drive safety standards. |
| Hybrid/Electric Vehicle Battery Management | Isolated Power Supplies for Industrial Sensors |
Use Scenario: Interfacing cell voltage monitors and temperature sensors across battery pack modules in 400–800 V EV architectures. IC Role / Device Role / Timing Role: Transmits isolated status and alarm signals from high-side monitoring ICs while powering their local LDOs via 5.0 V output. Use Value: Supports AEC-Q100 Grade 0 qualification and operates reliably at +105 °C ambient, meeting ASIL-B functional safety requirements. |
Use Scenario: Powering and isolating 4–20 mA loop-powered transmitters and RS-485 nodes in hazardous area instrumentation. IC Role / Device Role / Timing Role: Delivers intrinsically safe 3.3 V supply to sensor front-end ICs while blocking ground loops and common-mode transients up to 100 kV/µs. Use Value: Meets IEC 61000-4-4/6 immunity levels and enables Class I, Div 2 certification without additional isolation barriers. |
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 3.3 V output; uses iCoupler® transformer-based isolation; 50 Mbps max data rate | Limited to lower power loads; lacks programmable frequency/soft-start; not AEC-Q100 qualified | Preferred where lower cost and legacy iCoupler compatibility outweigh higher power and automotive needs |
| ISO7821FDWWR | 2-channel isolator only - no integrated DC-DC; requires external isolated power; 100 Mbps, 11 ns prop delay; 5 kVRMS | Needs discrete isolated DC-DC (e.g., SN6501 + transformer); increases layout complexity and component count | Chosen when maximum timing precision is critical and board space allows separate power conversion |
Compared with ADUM6210ARWZ and ISO7821FDWWR, SI88321ED-ASR uniquely combines 2 W isolated power, 100 Mbps speed, AEC-Q100 qualification, and programmable converter control in a single SOIC-20 package-enabling compact, automotive-ready designs without compromising performance or safety compliance.
Availability
SI88321ED-ASR is available at Aetrix Electronics and suitable for motor control inverters, industrial PLC I/O modules, and hybrid/electric vehicle battery management systems requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.
Supply support for SI88321ED-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 was designed to replace optocouplers and discrete isolation + DC-DC combinations in high-reliability, space-constrained applications such as EV traction inverters and industrial automation controllers.
FAQ
What is the maximum isolated output power of the SI88321ED-ASR?
The SI88321ED-ASR delivers up to 2 W average isolated output power at 5.0 V, sufficient to power secondary-side gate drivers, ADC references, and microcontroller peripherals. Peak power capability exceeds 5 W briefly during startup, but sustained operation is rated at 2 W under thermal limits specified in the datasheet. This output is regulated and sensed directly on the secondary side via the VSNS pin.
Does the SI88321ED-ASR support AEC-Q100 qualification?
Yes, the SI88321ED-ASR is AEC-Q100 qualified (Grade 0: –40 °C to +150 °C junction). It is manufactured using automotive-specific process flows, supports AIAG-compliant PPAP documentation, and includes IMDS and CAMDS listings. This makes it suitable for safety-critical automotive applications including battery management and motor control subsystems.
How is the DC-DC converter frequency programmed on the SI88321ED-ASR?
The SI88321ED-ASR uses pins SH_FC and SS to configure switching frequency from 200 kHz to 800 kHz via an external RC network. The time constant formed by resistor R and capacitor C connected between SH_FC and SS sets the operating frequency. Default factory setting is 250 kHz. This programmability helps optimize EMI performance for specific board layouts and noise-sensitive environments.
What transformer is recommended for use with the SI88321ED-ASR in a 5 V input to 5 V output configuration?
Skyworks validates the Coilcraft TA7618-AL and UMEC UTB02240s transformers for 4.5–5.5 V input to 3.0–5.5 V output operation with SI88321ED-ASR. Both provide 1:4 turns ratio, ≤64 nH leakage inductance, 2 µH ±5% primary inductance, and 5 kVRMS isolation rating. These transformers minimize radiated emissions and ensure stable regulation across temperature and load.
Can the SI88321ED-ASR be used in high-voltage to high-voltage DC-DC configurations?
No - the SI88321ED-ASR is specifically designed for low-voltage input (3–5.5 V) to low-voltage output (3.3/5.0 V) or low-to-high (e.g., 5 V → 24 V) configurations. High-voltage input (>5.5 V) applications require Si884xx or Si886xx families, which feature external switch drivers (ESW), current sense (RSN), and different pinouts. Using SI88321ED-ASR beyond its 5.5 V primary-side rating risks damage and invalidates safety certifications.
SI88321ED-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
SI88321ED-ASR FAQ
1.How can I place an order for SI88321ED-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88321ED-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 SI88321ED-ASR reliable?
The price and inventory of SI88321ED-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88321ED-ASR is usually 5 days.
3.What payment methods are accepted for SI88321ED-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88321ED-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88321ED-ASR?
SI88321ED-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88321ED-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 SI88321ED-ASR?
For technical support, including SI88321ED-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88321ED-ASR requirements.
6.How does Aetrix verify that SI88321ED-ASR is sourced from the original manufacturer or authorized distributors?
All SI88321ED-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 SI88321ED-ASR meets industry standards.
7.What is the process for return or replacement of SI88321ED-ASR?
All SI88321ED-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88321ED-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 SI88321ED-ASR part is unused and in its original packaging.
Return procedure for SI88321ED-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88321ED-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.
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ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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