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Skyworks Solutions Inc. SI88221BD-ASR
- Part No.:
- SI88221BD-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88221BD-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:2,119
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Product details
Overview
SI88221BD-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 galvanic separation between gate drivers and MCU logic.
For engineers reviewing the SI88221BD-ASR datasheet, SI88221BD-ASR pinout, SI88221BD-ASR application, or SI88221BD-ASR equivalent, this page provides verified specifications, SOIC-16 wide-body package details, automotive-grade AEC-Q100 qualification, safety certifications (UL 1577, VDE 62368-1), and real-world design context for industrial and EV power systems.
Technical Context
The SI88221BD-ASR implements RF-based on/off keying modulation across a silicon dioxide capacitive barrier, enabling robust noise immunity and zero initialization latency. Its digital channels operate independently with no handshake or protocol overhead, supporting bidirectional signal flow via separate forward (A→B) and reverse (B→A) paths.
The integrated flyback-derived DC-DC controller uses peak current mode regulation with secondary-side voltage sensing via VSNS, closed-loop error feedback across the isolation barrier, and internal power switches (VSW). It supports soft-start (SS pin), shutdown (SH 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 - meets reinforced insulation requirements per UL 1577 and VDE 62368-1. |
| Data Rate | Up to 100 Mbps - enables high-speed serial interface isolation (e.g., SPI, RS-485 PHY control) without timing bottlenecks. |
| Propagation Delay | 23 ns maximum - ensures tight timing alignment in real-time motor control loops and PWM gate drive synchronization. |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power isolated gate drivers (e.g., Si82xx) and microcontroller peripherals on the secondary side. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient environments without derating. |
| Transient Immunity | 100 kV/µs typical - suppresses fast common-mode transients in inverter switching nodes and IGBT collector lines. |
| AEC-Q100 Grade | Qualified to Grade 1 - validated for automotive powertrain and chassis applications with full PPAP support. |
Pinout & Package
SI88221BD-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, 2, 3, 4 | A1, A2, GNDA, VDDA | Primary-side digital I/O channels and supply - powers isolator input side; VDDA must be 3.0–5.5 V. |
| 5, 6 | GNDP, SH | Primary-side power ground and shutdown control - SH = high disables DC-DC; tie to GNDP for normal operation. |
| 7–10 | VSW, VDDP, VREGA, RSN | Internal switch output, primary power input (3–5.5 V), reference output, and current sense - VSW drives transformer primary; RSN unused in SI8822x. |
| 11–14 | GNDB, VDDB, VSNS, COMP | Secondary-side ground, digital supply, feedback input, and compensation node - VSNS sets output voltage via resistor divider; COMP requires RC network for stability. |
| 15, 16 | B1, B2 | Secondary-side digital outputs - provide isolated logic-level signals referenced to VDDB/GNDB; no pull-ups required. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based capacitive isolation | Eliminates magnetic coupling sensitivity and startup initialization - delivers deterministic latency and EMI resilience in noisy motor drive environments. |
| Integrated DC-DC with secondary-side sensing | Removes need for optocouplers or auxiliary bias supplies - simplifies BOM and improves load regulation (<±1.5%) across 10–100% load range. |
| Soft-start and shutdown control | SS pin capacitor sets ramp time; SH pin enables system-level power sequencing - prevents inrush into downstream gate drivers during cold start. |
| AEC-Q100 Grade 1 qualification | Validated for automotive power electronics including traction inverters and battery management interfaces - includes IMDS/CAMDS documentation and PPAP readiness. |
| 83% peak DC-DC efficiency | Achieved with external Schottky diode and optimized transformer - reduces thermal stress in enclosed enclosures and extends lifetime in continuous-duty applications. |
Applications
| Motor Control Inverters | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Isolating PWM signals and fault feedback between MCU and 3-phase IGBT/SiC gate drivers in 400 V–800 V traction inverters. IC Role / Device Role / Timing Role: Dual-channel isolator providing independent forward (PWM) and reverse (DESAT/fault) signal paths with <23 ns skew. Use Value: Enables safe, high-fidelity gate drive timing while powering isolated driver ICs directly from its 5 V/2 W DC-DC output - eliminates external isolated bias rails. |
Use Scenario: Digitally isolating analog input conditioning circuits and digital output drivers in modular PLC backplanes operating in factory-floor EMI environments. IC Role / Device Role / Timing Role: Provides reinforced insulation barrier between field-side 24 V sensors/actuators and 3.3 V logic domain, with integrated power for ADC/DAC reference supplies. Use Value: Reduces component count by integrating isolation + isolated power in one SOIC-16 footprint - simplifies layout and meets IEC 61000-4-5 surge immunity requirements. |
| Onboard Charger (OBC) Control | EV Battery Management Systems |
Use Scenario: Isolating AC-DC PFC controller signals and DC-DC LLC feedback loops in bidirectional OBCs with 650 V DC link. IC Role / Device Role / Timing Role: Delivers precise timing-critical gate drive enable/disable and voltage/current sampling isolation with <18 ns typical prop delay. Use Value: Supports functional safety (ASIL-B) decomposition by separating control and monitoring domains - certified to UL/VDE reinforced insulation standards. |
Use Scenario: Isolating cell voltage monitor (CVM) data lines and pack contactor control signals in high-voltage battery packs (up to 900 V). IC Role / Device Role / Timing Role: Transfers isolated digital status and command signals between low-voltage BMS MCU and high-side contactor drivers. Use Value: Powers isolated CAN transceivers and contactor gate drivers from its 5 V output - avoids need for separate isolated DC-DC converters in compact battery modules. |
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 500 mW isolated 5 V output; 25 Mbps data rate; no shutdown/soft-start pins; SOIC-16W package. | Limited to low-power isolated logic; insufficient for driving gate drivers or CAN transceivers directly. | Select when only basic digital isolation + minimal bias power is needed - not suitable for motor control or high-load applications. |
| ISO7821FDWR | No integrated DC-DC; requires external isolated power supply; 100 Mbps; 11 kVRMS VISO; SOIC-16W. | Requires additional isolated DC-DC converter (e.g., SN6501 + transformer); higher BOM cost and board area. | Select when highest isolation rating (11 kVRMS) or ultra-low emissions are mandatory - adds design complexity but improves safety margin. |
Compared with ADUM6210ARWZ and ISO7821FDWR, SI88221BD-ASR uniquely combines 2 W isolated power, 100 Mbps speed, AEC-Q100 qualification, and programmable DC-DC controls in one device - making it optimal for space-constrained, high-reliability automotive and industrial power systems where integrated power delivery is critical.
Availability
SI88221BD-ASR is available at Aetrix Electronics and suitable for motor control inverters, onboard chargers, and battery management systems requiring stable component supply, automotive-grade reliability, and long-term lifecycle support.
Supply support for SI88221BD-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 specifically for high-reliability isolated power and signal transfer in electric vehicle power electronics and industrial automation - emphasizing AEC-Q100 compliance, reinforced safety certification, and integrated DC-DC functionality.
FAQ
What is the maximum output power capability of the SI88221BD-ASR's integrated DC-DC converter?
The SI88221BD-ASR delivers up to 2 W of average isolated output power at 5.0 V, sufficient to power gate drivers, isolated CAN transceivers, and sensor interface circuitry on the secondary side. Peak power reaches 5 W briefly during startup, but sustained operation is rated at 2 W per the datasheet's thermal limits and SOIC-16 package constraints. This output is regulated and stable across temperature and load variations.
Does the SI88221BD-ASR support adjustable DC-DC switching frequency?
No, the SI88221BD-ASR uses a fixed 250 kHz switching frequency for its internal DC-DC converter - unlike Si883xx or Si886xx variants that offer programmable frequency via SH_FC/SS pins. Frequency adjustment is not supported; the device is optimized for EMI performance and stability at this default setting, with dithering enabled to reduce spectral peaks.
Can the SI88221BD-ASR be used in high-voltage input configurations (e.g., 24 V primary)?
No - the SI88221BD-ASR is designed exclusively for low-voltage input (3.0–5.5 V on VDDP/VDDA). It lacks external switch driver (ESW) and current sense (RSN) pins required for >5.5 V primary-side operation. For 24 V input applications, Skyworks specifies Si884xx or Si886xx families instead, which include ESW/RSN and support flyback topologies with external FETs.
What safety certifications does the SI88221BD-ASR hold?
The SI88221BD-ASR is certified to UL 1577 (5000 VRMS, 1 min), CSA 62368-1 (reinforced insulation), VDE 62368-1 (conformity), and CQC GB4943.1. It also meets VDE 60747-17 for basic insulation (pending final audit). All certifications apply to the SOIC-16 wide-body package and validate its suitability for industrial and automotive safety-critical designs.
How does the SI88221BD-ASR handle undervoltage lockout (UVLO) on both sides?
The SI88221BD-ASR implements independent UVLO monitors on VDDA (primary) and VDDB (secondary): VDDA exits UVLO at ≥3.0 V and enters at ≤2.7 V; VDDB exits at ≥2.7 V and enters at ≤2.4 V. Both sides power up asynchronously - outputs remain low until their respective supply crosses threshold and tSU (≥10 µs) elapses. This prevents metastability during asymmetric power sequencing.
SI88221BD-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
SI88221BD-ASR FAQ
1.How can I place an order for SI88221BD-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88221BD-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 SI88221BD-ASR reliable?
The price and inventory of SI88221BD-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88221BD-ASR is usually 5 days.
3.What payment methods are accepted for SI88221BD-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88221BD-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88221BD-ASR?
SI88221BD-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88221BD-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 SI88221BD-ASR?
For technical support, including SI88221BD-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88221BD-ASR requirements.
6.How does Aetrix verify that SI88221BD-ASR is sourced from the original manufacturer or authorized distributors?
All SI88221BD-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 SI88221BD-ASR meets industry standards.
7.What is the process for return or replacement of SI88221BD-ASR?
All SI88221BD-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88221BD-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 SI88221BD-ASR part is unused and in its original packaging.
Return procedure for SI88221BD-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88221BD-ASR Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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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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