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Skyworks Solutions Inc. SI88221BC-ISR
- Part No.:
- SI88221BC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88221BC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,571
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Product details
Overview
SI88221BC-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 reinforced 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 where compact, high-reliability signal and power isolation is required.
For engineers reviewing the SI88221BC-ISR datasheet, SI88221BC-ISR pinout, SI88221BC-ISR application, or SI88221BC-ISR equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative parts for industrial and automotive isolated power+signal designs.
Technical Context
The SI88221BC-ISR implements RF-based on-off keying (OOK) modulation across a silicon dioxide capacitive barrier, enabling robust noise immunity and magnetic field rejection without startup initialization. Its digital channels operate as transparent CMOS buffers with independent UVLO monitoring on both sides.
The integrated DC-DC controller uses peak-current-mode flyback topology with internal primary-side switches (VSW), secondary-side feedback via VSNS, and closed-loop regulation transmitted across the isolation barrier. 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 (UL 1577, VDE 62368-1, CSA 62368-1) |
| Data Rate | Up to 100 Mbps - enables high-speed serial interface isolation (e.g., SPI, RS-485 PHY control) |
| Propagation Delay | 23 ns max - supports tight-timing applications like gate driver feedback loops |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power isolated MCU peripherals and sensors |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient conditions |
| Transient Immunity | 100 kV/µs typical - ensures robust operation in noisy motor drive and inverter environments |
| AEC-Q100 Grade | Qualified - meets automotive reliability requirements for ECU and battery management subsystems |
Pinout & Package
SI88221BC-ISR is housed in a RoHS-compliant SOIC-16 wide-body package (10.3 mm × 10.3 mm, 2.3 mm height) with creepage/clearance ≥ 8.0 mm per IEC 60664-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GNDP | Primary-side power ground | Reference for VDDP and internal switch driver; must be low-inductance connected to VDDP bypass capacitor |
| 2 VSW | Internal switch output | Drives transformer primary directly; rated for ≤5.5 V; requires snubber for EMI suppression |
| 3 VDDP | Primary-side power supply | Input for DC-DC controller (3.0–5.5 V); powers internal switches and logic |
| 4 VDDA | Primary-side signal supply | Powers A1/A2 input receivers and UVLO circuitry; decoupled separately from VDDP |
| 5 GNDA | Primary-side signal ground | Reference for A1/A2 inputs; tied to GNDP via shortest possible trace |
| 6 SH | Shutdown control | Active-high disable of DC-DC converter; connect to GND for normal operation |
| 7 GNDB | Secondary-side signal ground | Reference for B1/B2 outputs; isolated from GNDA; connects to VDDB bypass cap |
| 8 VDDB | Secondary-side signal supply | Powered by internal DC-DC; supplies B1/B2 output drivers and UVLO |
| 9 VSNS | Feedback voltage sense | Connects to resistor divider from VDDB output; sets regulated DC-DC voltage |
| 10 COMP | Compensation node | External RC network (49.9 kΩ + capacitor) stabilizes DC-DC control loop |
| 11 NC | No-connect | Not bonded; leave unconnected and unpopulated on PCB |
| 12 A1 | Primary-side input channel 1 | Unidirectional input driving B1; CMOS-compatible, 1.65–5.5 V logic range |
| 13 A2 | Primary-side input channel 2 | Unidirectional input driving B2; independent timing and UVLO from A1 |
| 14 B1 | Secondary-side output channel 1 | Isolated output mirroring A1; drives loads up to 8 mA sink/source |
| 15 B2 | Secondary-side output channel 2 | Isolated output mirroring A2; rail-to-rail swing referenced to VDDB/GNDB |
| 16 HF | High-frequency oscillator node | Internal RF carrier path; not user-accessible; requires no external connection |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC with secondary-side sensing | Eliminates optocouplers and external feedback components; improves load regulation to ±1.5% |
| RF OOK isolation architecture | Delivers 100 kV/µs CMTI and >80 dB common-mode rejection without magnetic coupling concerns |
| Fail-safe default output state | B1/B2 held low during UVLO or power loss - prevents undefined states in safety-critical gate drivers |
| Automotive-grade qualification | AEC-Q100 Grade 1, PPAP-ready, IMDS/CAMDS compliant - supports Tier-1 automotive design-in |
| SOIC-16 wide-body packaging | Enables 8.0 mm creepage/clearance - meets reinforced insulation requirements for 600 VAC systems |
Applications
| Industrial Motor Control | EV Onboard Charger Control |
|---|---|
Use Scenario: Isolating PWM signals and fault feedback between MCU and IGBT/SiC gate drivers in 3-phase inverters. IC Role / Device Role / Timing Role: Dual-channel isolator providing timing-aligned A1→B1 (PWM) and A2→B2 (FAULT) paths with <23 ns skew. Use Value: Enables fast, reliable gate drive with integrated 5 V isolated supply - eliminates separate DC-DC and discrete isolators. |
Use Scenario: Signal and power isolation between AC/DC controller and DC/DC stage in bidirectional OBC units. IC Role / Device Role / Timing Role: Provides isolated communication (e.g., UART, SPI) and auxiliary 5 V rail for secondary-side MCU and sensors. Use Value: Reduces BOM count by combining 2-channel isolation + 2 W DC-DC in single SOIC-16 footprint. |
| Solar Inverter PLC Interface | Factory Automation I/O Module |
Use Scenario: Isolating digital I/O and status reporting between PLC master and string-level solar inverter controllers. IC Role / Device Role / Timing Role: Transmits command signals (A1/A2) and receives telemetry (B1/B2) across 5 kVRMS barrier with fail-safe defaults. Use Value: Supports long-term reliability in outdoor environments with –40 °C to +125 °C operation and AEC-Q100 stress screening. |
Use Scenario: Providing isolated digital input conditioning and sensor power in modular industrial I/O terminals. IC Role / Device Role / Timing Role: Powers isolated sensor front-end (VDDB) while relaying status bits (A1→B1, A2→B2) to host controller. Use Value: Delivers 2 W isolated power without external regulators - simplifies layout and reduces thermal hotspots. |
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 + 2 W isolated DC-DC; 5 kVRMS; 100 Mbps; SOIC-16; but uses iCoupler® magnetic coupling and lacks AEC-Q100 qualification | Targeted at industrial automation, not automotive; lower CMTI (50 kV/µs) limits use in high-noise motor drives | Choose when magnetic isolation compatibility or ADI ecosystem integration is prioritized over automotive qualification |
| ISO7821FDWR | 2-channel isolator only - no integrated DC-DC; requires external isolated power; 5 kVRMS; 100 Mbps; SOIC-16; AEC-Q100 Grade 1 | Used where system already provides isolated 5 V rail; adds external DC-DC complexity but offers higher data integrity margin | Choose when strict separation of signal and power isolation is mandated, or when higher channel count scalability is needed |
Compared with ADUM6223ARWZ and ISO7821FDWR, SI88221BC-ISR uniquely combines AEC-Q100 qualification, RF-based 100 kV/µs CMTI, and integrated 2 W DC-DC in a single SOIC-16 package - making it optimal for space-constrained automotive and industrial inverters requiring both signal integrity and self-powered isolated domains.
Availability
SI88221BC-ISR is available at Aetrix Electronics and suitable for industrial motor control, EV onboard charger control, and solar inverter PLC interfaces requiring stable component supply, automotive-grade reliability, and integrated isolated power delivery.
Supply support for SI88221BC-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 family was designed specifically for applications demanding combined high-speed digital isolation and compact isolated DC-DC conversion - targeting automotive electrification, industrial automation, and renewable energy systems.
FAQ
What is the maximum data rate supported by the SI88221BC-ISR?
The SI88221BC-ISR supports a maximum data rate of 100 Mbps across both isolation channels. This is achieved using RF-based on-off keying modulation and is specified across the full operating temperature range (–40 °C to +125 °C). The device maintains sub-23 ns propagation delay at this rate, making it suitable for high-speed serial protocols including SPI clock domains and fast digital feedback loops in SI88221BC-ISR-based systems.
Does the SI88221BC-ISR require external components to operate its DC-DC converter?
Yes - the SI88221BC-ISR requires an external miniature transformer, input/output capacitors (C2, C3), a rectifying Schottky diode (D1), and a resistor divider (R1/R2) for VSNS feedback. It also needs a compensation network (RCOMP + CCOMP) on the COMP pin. Unlike fully integrated modules, SI88221BC-ISR relies on these passive components to configure output voltage, regulate performance, and ensure EMI compliance - all detailed in AN892.
Can the SI88221BC-ISR generate 24 V output?
No - the SI88221BC-ISR's integrated DC-DC converter is configured for low-voltage input (3.0–5.5 V) to low-voltage output (3.3 V or 5.0 V) only. It delivers up to 2 W at those voltages. For 24 V output, Skyworks specifies the Si8842x or Si8862x families, which support high-voltage-to-high-voltage conversion and include external switch drivers (ESW) and current sense (RSN) pins - capabilities not present in SI88221BC-ISR.
What is the function of the SH pin on the SI88221BC-ISR?
The SH (Shutdown) pin on the SI88221BC-ISR is an active-high control that disables the internal DC-DC converter when driven logic high. During shutdown, the digital isolation channels remain fully operational - preserving signal integrity while halting isolated power generation. For normal operation, SH must be tied to GNDA. This feature enables dynamic power management in SI88221BC-ISR-based systems such as sleep-mode sequences in automotive ECUs.
Is the SI88221BC-ISR pin-compatible with other Si8822x variants like SI88220 or SI88222?
No - SI88221BC-ISR has a unique pin configuration among Si8822x devices. As shown in Figure 1 of the datasheet, SI88221 places A1/A2 on pins 12/13 and B1/B2 on pins 14/15, whereas SI88220 swaps A/B channel positions and SI88222 duplicates transmitter/receiver roles on both sides. Pinouts are not interchangeable; PCB layout must match the exact variant. SI88221BC-ISR's pin mapping is fixed and validated per its SOIC-16 marking and functional description.
SI88221BC-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-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:
- 16-SOIC
SI88221BC-ISR FAQ
1.How can I place an order for SI88221BC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88221BC-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 SI88221BC-ISR reliable?
The price and inventory of SI88221BC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88221BC-ISR is usually 5 days.
3.What payment methods are accepted for SI88221BC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88221BC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88221BC-ISR?
SI88221BC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88221BC-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 SI88221BC-ISR?
For technical support, including SI88221BC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88221BC-ISR requirements.
6.How does Aetrix verify that SI88221BC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88221BC-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 SI88221BC-ISR meets industry standards.
7.What is the process for return or replacement of SI88221BC-ISR?
All SI88221BC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88221BC-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 SI88221BC-ISR part is unused and in its original packaging.
Return procedure for SI88221BC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88221BC-ISR 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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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7741DWR
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ISO7741FDWR
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