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Skyworks Solutions Inc. SI88221BC-ASR
- Part No.:
- SI88221BC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88221BC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:1,640
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Product details
Overview
SI88221BC-ASR from Skyworks Solutions is a dual-channel digital isolator with integrated isolated DC-DC converter, delivering up to 5 W output power, supporting 0–100 Mbps data rates, and providing 5000 VRMS reinforced isolation. It features two unidirectional isolation channels (A1/A2 → B1/B2), internal primary-side power switches (VSW), and shutdown control (SH pin), enabling compact isolated power and signal transfer in industrial motor drives and EV battery management systems.
For engineers reviewing the SI88221BC-ASR datasheet, SI88221BC-ASR pinout, SI88221BC-ASR application, or SI88221BC-ASR equivalent, this device is selected for designs requiring simultaneous galvanic isolation of digital signals and local isolated 3.3/5 V supply generation without external MOSFETs-especially where space-constrained PCB layouts demand SOIC-16 wide-body integration and AEC-Q100-compliant reliability.
Technical Context
The SI88221BC-ASR implements RF-based capacitive isolation using on/off keying modulation across a silicon dioxide barrier, achieving 18 ns typical propagation delay and 100 kV/µs transient immunity. Its integrated flyback DC-DC controller operates at fixed 250 kHz switching frequency and uses internal VSW switches to drive an external transformer, with feedback via VSNS and loop compensation at COMP.
It supports low-voltage input configurations (3–5.5 V to 3.3/5 V output) and includes undervoltage lockout (UVLO) on both sides, soft-start via external capacitor on SS, and shutdown control via SH pin asserted high. All isolation and power functions are certified to UL 1577 (5000 VRMS), VDE 62368-1, and CSA 62368-1 standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - enables reinforced insulation in safety-critical industrial and automotive systems. |
| Data Rate | 0–100 Mbps - supports high-speed serial interfaces including SPI, RS-485, and CAN FD physical layer signaling. |
| Propagation Delay | 18 ns typical, 23 ns max - ensures tight timing alignment in real-time control loops and encoder feedback paths. |
| DC-DC Output Power | Up to 5 W peak - powers secondary-side microcontrollers, gate drivers, or sensors without discrete DC-DC stages. |
| Operating Temp | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient environments. |
| Transient Immunity | 100 kV/µs typical - maintains signal integrity during fast-switching EMI events in motor inverters and power converters. |
| Regulatory Certifications | UL 1577, VDE 62368-1, CSA 62368-1, CQC GB4943.1 - meets global safety requirements for end-equipment certification. |
Pinout & Package
SI88221BC-ASR is housed in a RoHS-compliant SOIC-16 wide-body package (10.3 mm × 10.3 mm, 2.3 mm height) with creepage/clearance ≥ 8.3 mm, optimized for reinforced isolation compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GNDP | Primary-side power ground | Reference for VDDP and internal switch driver; must be short-traced to VDDP bypass capacitor. |
| 2 VSW | Internal power switch output | Drives transformer primary directly; requires snubber network to suppress VSW voltage spikes. |
| 3 VDDP | Primary-side power supply | Input for DC-DC controller (3–5.5 V); supplies internal logic and power stage. |
| 4 VDDA | Primary-side signal supply | Powers A1/A2 digital inputs; independent of VDDP but shares same domain. |
| 5 GNDA | Primary-side signal ground | Reference for A1/A2 I/O; must be connected to GNDP with minimal impedance. |
| 6 SH | Shutdown control input | Active-high shutdown of DC-DC converter; tie to GND for normal operation. |
| 7 GNDB | Secondary-side signal ground | Reference for B1/B2 outputs; isolated from GNDA by capacitive barrier. |
| 8 VDDB | Secondary-side signal supply | Powered by internal DC-DC; supplies B1/B2 outputs and external loads up to 5 W. |
| 9 VSNS | Feedback voltage sense input | Monitors isolated output voltage via resistor divider; sets VOUT accuracy and regulation. |
| 10 COMP | Compensation node | Connects external R-C network (49.9 kΩ + capacitor) to stabilize DC-DC control loop. |
| 11 NC | No-connect | Not bonded; leave unconnected per design guidelines. |
| 12 A1 | Primary-side input channel 1 | Unidirectional digital input; drives B1 output across isolation barrier. |
| 13 A2 | Primary-side input channel 2 | Unidirectional digital input; drives B2 output across isolation barrier. |
| 14 B1 | Secondary-side output channel 1 | CMOS output referenced to VDDB/GNDB; compatible with 3.3/5 V logic families. |
| 15 B2 | Secondary-side output channel 2 | CMOS output referenced to VDDB/GNDB; supports fail-safe default-low startup behavior. |
| 16 HF XMTR / RCVR | RF carrier interface | Internal RF oscillator and demodulator path; not user-accessible; enables noise-immune data transmission. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC with internal switches | Eliminates need for external MOSFETs or gate drivers-reduces BOM count and layout area in SOIC-16 footprint. |
| Capacitive RF isolation architecture | Delivers 100 kV/µs CMTI and 18 ns prop delay without magnetic coupling or initialization sequences. |
| Reinforced isolation certification | 5000 VRMS UL/VDE/CSA approval enables single-component isolation in IEC 61800-5-1 and ISO 26262 ASIL-B systems. |
| Programmable soft-start | External capacitor on SS pin controls inrush current ramp rate-prevents input rail collapse during cold start. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including battery disconnect units and onboard chargers operating at 125 °C junction. |
Applications
| Industrial Motor Drives | EV Battery Management Systems |
|---|---|
|
Use Scenario: Isolating PWM gate signals and current-sense ADC outputs between MCU and 3-phase inverter stage. IC Role / Device Role / Timing Role: Dual-channel isolator provides independent A1→B1 (PWM) and A2→B2 (ADC sync) paths while powering gate driver ICs from VDDB. Use Value: Enables compact, certified isolation without external DC-DC, reducing component count and improving thermal margin in IPM modules. |
Use Scenario: Communicating cell voltage measurements from high-side monitoring ICs to central BMS MCU across 400–800 V battery stacks. IC Role / Device Role / Timing Role: Provides reinforced isolation for SPI bus lines (SCLK/MOSI/MISO) and powers isolated ADC reference circuitry from VDDB. Use Value: Meets IEC 61508 SIL-2 and ISO 26262 ASIL-B requirements with single-component solution and 5000 VRMS rating. |
| Programmable Logic Controllers | Isolated Industrial Ethernet Nodes |
|
Use Scenario: Isolating digital I/O expansion modules from main CPU backplane in harsh factory environments. IC Role / Device Role / Timing Role: Transfers discrete ON/OFF status and control commands bidirectionally while powering remote I/O ASICs from VDDB. Use Value: Supports 100 Mbps data rate for deterministic cyclic communication in EtherCAT and PROFINET IRT networks. |
Use Scenario: Isolating PHY interface signals (MDIO, MDC, TX_EN) and powering isolated Ethernet PHY from MCU side. IC Role / Device Role / Timing Role: Delivers isolated 3.3 V to PHY while transferring management and control signals across isolation barrier. Use Value: Eliminates need for separate isolated DC-DC and digital isolator-reducing bill-of-materials and board space by >30%. |
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 | Uses iCoupler® transformer isolation; 2 W max isolated output; no internal power switches-requires external FET. | Limited to lower-power isolated logic; unsuitable for >2 W secondary loads or space-constrained layouts. | Select when legacy ADI ecosystem compatibility or lower EMI profile is prioritized over output power density. |
| ISO7821FDWR | Capacitive isolation only-no integrated DC-DC; requires external isolated power supply (e.g., ISOW7841). | Increases system complexity and footprint; cannot replace SI88221BC-ASR's combined signal+power function. | Choose only if existing design already includes isolated bias supply and higher channel count (3–4 ch) is needed. |
Compared with ADUM6223ARWZ and ISO7821FDWR, SI88221BC-ASR uniquely integrates full 5 W DC-DC conversion with internal switches in a single SOIC-16 package-enabling true "isolate-and-power" functionality without external FETs or auxiliary converters, critical for compact industrial and automotive subsystems.
Availability
SI88221BC-ASR is available at Aetrix Electronics and suitable for industrial motor drives, EV battery management systems, and programmable logic controllers requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for SI88221BC-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 Si88xx family was designed to replace optocouplers and discrete isolator+DC-DC combinations in high-reliability, space-constrained applications-delivering integrated signal isolation and regulated isolated power in a single certified package.
FAQ
What is the maximum isolated output power supported by SI88221BC-ASR?
SI88221BC-ASR supports up to 5 W peak isolated output power using its integrated DC-DC converter and internal VSW power switches. This enables direct powering of secondary-side microcontrollers, gate drivers, or sensors without external MOSFETs-making it ideal for compact industrial and automotive subsystems where board space is constrained.
Does SI88221BC-ASR require external components to operate its DC-DC converter?
Yes, SI88221BC-ASR requires an external miniature transformer, rectifying Schottky diode, input/output capacitors (C2/C3), and a resistor divider (R1/R2) for VSNS feedback. However, it does not require external power switches-the internal VSW driver eliminates the need for discrete MOSFETs, simplifying design versus alternatives like ADUM6223ARWZ.
How is the shutdown function implemented on SI88221BC-ASR?
SI88221BC-ASR implements shutdown via the SH pin (Pin 6): asserting SH high disables the DC-DC converter while preserving digital isolation functionality. For normal operation, SH must be tied to GND. This feature allows controlled power-down of isolated rails without disrupting signal integrity across the barrier.
What isolation certifications apply to SI88221BC-ASR?
SI88221BC-ASR is certified to UL 1577 (5000 VRMS, 1 min), VDE 62368-1 (reinforced insulation), CSA 62368-1, and CQC GB4943.1. These approvals validate its use in safety-critical applications including industrial automation, EV traction inverters, and medical equipment where reinforced isolation is mandated.
Can SI88221BC-ASR support 24 V input to 5 V isolated output?
No-SI88221BC-ASR is configured for low-voltage input (3–5.5 V to 3.3/5 V output) and uses internal VSW switches. For 24 V input applications, Skyworks offers Si8842x/Si8862x variants with external switch drivers (ESW/RSN) and high-voltage topology. SI88221BC-ASR must be used within its specified 3–5.5 V VDDP range.
SI88221BC-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
SI88221BC-ASR FAQ
1.How can I place an order for SI88221BC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88221BC-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 SI88221BC-ASR reliable?
The price and inventory of SI88221BC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88221BC-ASR is usually 5 days.
3.What payment methods are accepted for SI88221BC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88221BC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88221BC-ASR?
SI88221BC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88221BC-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 SI88221BC-ASR?
For technical support, including SI88221BC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88221BC-ASR requirements.
6.How does Aetrix verify that SI88221BC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88221BC-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 SI88221BC-ASR meets industry standards.
7.What is the process for return or replacement of SI88221BC-ASR?
All SI88221BC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88221BC-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 SI88221BC-ASR part is unused and in its original packaging.
Return procedure for SI88221BC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88221BC-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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