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Skyworks Solutions Inc. SI88221EC-ASR
- Part No.:
- SI88221EC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88221EC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:1,424
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Product details
Overview
SI88221EC-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 SI88221EC-ASR datasheet, SI88221EC-ASR pinout, SI88221EC-ASR application, or SI88221EC-ASR equivalent, this page provides verified technical context, SOIC-16 wide-body package mapping, confirmed AEC-Q100 qualification, safety-certified isolation performance (UL 1577, VDE 62368-1), and validated alternative options for industrial and automotive signal/power isolation designs.
Technical Context
The SI88221EC-ASR implements RF-based on/off keying modulation across a silicon dioxide capacitive barrier for noise-immune digital channel operation, with no startup initialization required. Its integrated flyback DC-DC controller senses output voltage on the secondary side via VSNS and transmits error feedback across the isolation barrier-eliminating optocouplers and enabling superior line/load regulation.
This variant uses internal power switches (VSW) and supports low-voltage input configurations (3–5.5 V primary), delivering up to 2 W at 3.3/5.0 V on the isolated side. It includes shutdown (SH pin), soft-start (SS pin), and fixed 250 kHz switching frequency-no external frequency programming required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute (UL 1577 reinforced) |
| 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 loops |
| DC-DC Output Power | 2 W average at 3.3/5.0 V - sufficient to power isolated gate drivers and ADCs 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 EFT/burst events in noisy motor drive environments |
| Safety Certifications | UL 1577, CSA 62368-1, VDE 62368-1, CQC GB4943.1 - meets global reinforced insulation requirements |
Pinout & Package
SI88221EC-ASR is housed in a RoHS-compliant SOIC-16 wide-body package (10.3 mm × 10.3 mm, 2.65 mm height) with creepage/clearance ≥ 8.3 mm, rated for 5000 VRMS working voltage.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | HF XMTR | High-frequency transmitter input for Channel A1 - connects to primary-side digital signal source |
| 2 | HF RCVR | High-frequency receiver output for Channel A2 - drives primary-side logic after isolation |
| 3 | GNDP | Primary-side power ground - reference for VDDP and internal switch driver |
| 4 | VSW | Internal switch output - drives transformer primary with integrated NMOS (no external FET needed) |
| 5 | VDDP | Primary-side DC-DC input supply - accepts 3–5.5 V for low-voltage configuration |
| 6 | SH | Shutdown control - asserted high disables DC-DC converter; tied to GND for normal operation |
| 7 | A1 | Digital isolator input (Channel 1, primary side) - CMOS-compatible, 1.65–5.5 V logic |
| 8 | A2 | Digital isolator input (Channel 2, primary side) - independent unidirectional path |
| 9 | B1 | Digital isolator output (Channel 1, isolated side) - drives secondary-side loads up to 25 mA |
| 10 | B2 | Digital isolator output (Channel 2, isolated side) - rail-to-rail CMOS output referenced to VDDB |
| 11 | GNDB | Secondary-side signal ground - isolated reference for VDDB and B1/B2 outputs |
| 12 | VDDB | Secondary-side signal supply - powered by internal DC-DC; supplies B1/B2 I/O |
| 13 | VSNS | DC-DC feedback sense - connects to resistor divider on secondary to regulate VDDB |
| 14 | COMP | Compensation node - external R-C network (49.9 kΩ + capacitor) stabilizes flyback loop |
| 15 | GNDA | Primary-side signal ground - isolated from GNDP; reference for A1/A2 inputs |
| 16 | VDDA | Primary-side signal supply - powers A1/A2 input buffers (1.65–5.5 V) |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates startup initialization and provides immunity to magnetic fields and EMI without external components |
| Integrated flyback DC-DC with secondary-side sensing | Enables precise 3.3/5.0 V regulation without optocouplers or secondary-side bias circuits |
| Reinforced insulation certification | UL 1577 (5 kVRMS), VDE 62368-1, and CSA 62368-1 compliance ensures safety in mains-connected systems |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including traction inverters and battery management systems |
| SOIC-16 wide-body package | Provides 8.3 mm creepage/clearance - meets IPC-2221B Class B requirements for 5000 VRMS working voltage |
Applications
| Motor Control Inverter | Industrial PLC I/O Module |
|---|---|
Use Scenario: Isolating gate driver signals and feedback in 3-phase IGBT/SiC inverter stages operating at 600–1200 V bus voltage. IC Role / Device Role / Timing Role: SI88221EC-ASR provides dual-channel signal isolation (PWM + fault feedback) and powers isolated gate driver ICs from its 5 V/2 W DC-DC output. Use Value: Eliminates need for separate isolated DC-DC converter and optocouplers, reducing BOM count by ≥3 components and PCB area by >30%. |
Use Scenario: Digitally isolating analog input/output channels and communication buses (RS-485, CAN) in modular PLC backplanes exposed to 250–600 VAC field wiring. IC Role / Device Role / Timing Role: SI88221EC-ASR isolates sensor ADC data lines and microcontroller UART signals while supplying isolated 3.3 V power to remote I/O ASICs. Use Value: Achieves 5000 VRMS reinforced insulation with single-component integration, simplifying safety certification for UL 61010-1 Class II equipment. |
| Onboard Charger (OBC) Control | EV Battery Management System (BMS) |
Use Scenario: Isolating AC-DC PFC controller signals and DC-DC LLC feedback in automotive bidirectional OBCs operating at 400–800 V DC link. IC Role / Device Role / Timing Role: SI88221EC-ASR delivers isolated 5 V power to secondary-side current-sense amplifiers and transmits isolated voltage/current measurement data to MCU. Use Value: Supports AEC-Q100 Grade 1 operation at 125 °C ambient, enabling direct placement near power stage without derating. |
Use Scenario: Isolating cell voltage monitoring ICs and pack contactor control signals in high-voltage EV battery packs (up to 900 V). IC Role / Device Role / Timing Role: SI88221EC-ASR isolates daisy-chained BMS ADC data streams and powers isolated SPI interface ICs using its regulated 3.3 V output. Use Value: Meets ISO 26262 ASIL-B functional safety requirements via certified isolation barrier and thermal shutdown protection. |
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 |
|---|---|---|---|
| ADUM6223ARWZ | 2-channel isolator + 500 mW isolated 5 V output; uses iCoupler® capacitive technology; 50 Mbps max data rate | Limited to lower-power isolated peripherals (e.g., sensors); insufficient for gate driver biasing | Select when system power budget < 0.5 W and data rate ≤ 50 Mbps suffices |
| ISO7821FDWR | 2-channel isolator only - no integrated DC-DC; requires external isolated power supply; 100 Mbps, 11 ns prop delay | Requires additional transformer, rectifier, and regulator - increases layout complexity and cost | Select when higher timing precision (11 ns) is critical and external power design is already established |
Compared with ADUM6223ARWZ and ISO7821FDWR, SI88221EC-ASR uniquely combines 2 W isolated power delivery, 100 Mbps speed, and AEC-Q100 qualification in a single SOIC-16 package-enabling simplified, high-power, automotive-grade isolation without compromising performance or safety certification effort.
Availability
SI88221EC-ASR is available at Aetrix Electronics and suitable for motor control inverters, industrial PLC I/O modules, and EV onboard charger control requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for SI88221EC-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 Si88xx family was designed specifically for high-reliability industrial and automotive systems requiring integrated signal isolation and compact isolated power-replacing discrete optocoupler + DC-DC combinations with a single-certified solution.
FAQ
What is the maximum isolated output power of the SI88221EC-ASR?
The SI88221EC-ASR delivers up to 2 W of average isolated output power at 3.3 V or 5.0 V. This is sufficient to power isolated gate drivers, ADCs, and microcontrollers on the secondary side without external regulators. Peak power capability exceeds 5 W during short transients, but continuous operation is rated at 2 W per the datasheet's thermal limits and SOIC-16 package constraints.
Does the SI88221EC-ASR require external components for DC-DC operation?
Yes, the SI88221EC-ASR requires an external miniature transformer, input/output capacitors (C2, C3), blocking capacitor (C1), rectifying Schottky diode (D1), and resistor divider (R1/R2) for VSNS feedback. It does not require external power switches or optocouplers-the internal VSW driver and secondary-side sensing eliminate those components. Full bill-of-materials guidance is provided in AN892.
Is the SI88221EC-ASR pin-compatible with other Si8822x variants?
No-SI88221EC-ASR has a unique pinout among Si8822x devices. As shown in Figure 1 of the datasheet, SI88221 places HF XMTR/RCVR on pins 1–2 and A1/A2 on pins 7–8, whereas SI88220 and SI88222 assign different functions to those positions. Pin compatibility must be verified per exact part number; substitution without layout review will cause functional failure.
What safety certifications apply to the SI88221EC-ASR?
The SI88221EC-ASR is certified to UL 1577 (5000 VRMS, 1 min), CSA 62368-1, VDE 62368-1, and CQC GB4943.1 for reinforced insulation. These approvals cover both the digital isolation barrier and the integrated DC-DC converter, allowing single-component compliance for end-equipment safety standards such as IEC 61800-5-1 and UL 61800-5-1.
Can the SI88221EC-ASR operate with 24 V input?
No-SI88221EC-ASR is configured for low-voltage input (3–5.5 V on VDDP). It lacks external switch drivers (ESW, RSN) and high-voltage sense circuitry required for 24 V operation. For 24 V input, Skyworks specifies Si8842x or Si8862x families, which use external FETs and support up to 24 V primary-side supply.
SI88221EC-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si88x2x
- Package/Case:
- 16-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:
- 16-SOIC
SI88221EC-ASR FAQ
1.How can I place an order for SI88221EC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88221EC-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 SI88221EC-ASR reliable?
The price and inventory of SI88221EC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88221EC-ASR is usually 5 days.
3.What payment methods are accepted for SI88221EC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88221EC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88221EC-ASR?
SI88221EC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88221EC-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 SI88221EC-ASR?
For technical support, including SI88221EC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88221EC-ASR requirements.
6.How does Aetrix verify that SI88221EC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88221EC-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 SI88221EC-ASR meets industry standards.
7.What is the process for return or replacement of SI88221EC-ASR?
All SI88221EC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88221EC-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 SI88221EC-ASR part is unused and in its original packaging.
Return procedure for SI88221EC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88221EC-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
-
ISO7741FDWR
Texas Instruments
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