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Skyworks Solutions Inc. SI88244EC-ASR
- Part No.:
- SI88244EC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88244EC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:4,802
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Product details
Overview
SI88244EC-ASR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, delivering up to 5 W peak output power at 3.3 V or 5.0 V, supporting data rates up to 100 Mbps, propagation delay ≤23 ns, and reinforced isolation rated at 5000 VRMS. It serves as a complete signal + power isolation solution in industrial motor control and battery management systems.
For engineers reviewing the SI88244EC-ASR datasheet, SI88244EC-ASR pinout, SI88244EC-ASR application, or SI88244EC-ASR equivalent, key selection criteria include its SOIC-20 wide-body package, 4-channel unidirectional isolation architecture, integrated flyback controller with soft-start and shutdown, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The SI88244EC-ASR implements four independent RF-based capacitive isolation channels using on/off keying modulation across a silicon dioxide barrier, enabling robust noise immunity and zero initialization requirement. Its integrated DC-DC controller operates in peak current mode with secondary-side voltage sensing via VSNS, closed-loop feedback across the isolation barrier, and internal power switches driving the transformer through VSW.
This variant (Si882xx family) uses fixed 250 kHz switching frequency, supports low-voltage input (3–5.5 V) to isolated 3/5 V output, includes SH shutdown pin (Pin 6), and requires no external FET-distinguishing it from Si884xx/Si886xx variants that use ESW/RSN for high-voltage operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | Up to 100 Mbps - enables high-speed serial interface isolation (e.g., SPI, RS-485 PHY control). |
| Propagation delay | ≤23 ns max - ensures tight timing alignment in real-time control loops like motor gate drivers. |
| Isolation rating | 5000 VRMS (1 min) - meets UL 1577, CSA 62368-1, and VDE 62368-1 for reinforced insulation in industrial safety-critical systems. |
| DC-DC output power | Up to 5 W peak - powers isolated side logic (VDDB) and external circuitry (e.g., gate drivers, ADCs) without auxiliary supply. |
| Operating temp | –40 °C to +125 °C - supports under-hood automotive and industrial ambient conditions. |
| Transient immunity | 100 kV/µs typical - maintains signal integrity during fast-switching EMI events in inverters and SMPS. |
| Package | SOIC-20 wide-body - provides 8.3 mm creepage/clearance for 5 kVRMS isolation compliance. |
Pinout & Package
SI88244EC-ASR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 2.3 mm height) with 0.65 mm pitch, optimized for high-voltage creepage and thermal dissipation in isolated power domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDP | Primary-side DC-DC input supply | Accepts 3–5.5 V input to power internal switch and controller; bypass capacitor required. |
| GNDP | Primary-side DC-DC ground | Must be short-traced to VDDP; forms return path for primary-side switching current. |
| VSW | Internal switch output | Drives transformer primary directly; no external FET needed - defines Si882xx low-voltage topology. |
| SH | Shutdown control | Active-high signal (Pin 6) disables DC-DC converter; tied low for normal operation. |
| VDDA | Primary-side isolator supply | Powers A1–A4 transmitter circuits; separate from VDDP to decouple noise between power and signal domains. |
| GNDA | Primary-side isolator ground | Reference for A1–A4 inputs; must be isolated from GNDP by PCB layout. |
| A1–A4 | Primary-side input channels | Unidirectional CMOS inputs accepting 1.8–5.5 V logic; each maps to corresponding B1–B4 output. |
| VDDB | Secondary-side isolator supply | Powered by internal DC-DC; supplies B1–B4 receivers and external loads up to 5 W. |
| GNDB | Secondary-side isolator ground | Reference for B1–B4 outputs; galvanically isolated from GNDA; connects to VSNS feedback divider. |
| B1–B4 | Secondary-side output channels | Unidirectional CMOS outputs; rail-to-rail swing referenced to VDDB/GNDB. |
| VSNS | DC-DC feedback sense | Connects to resistor divider on secondary side to set regulated VDDB output voltage (e.g., 3.3 V or 5.0 V). |
| COMP | Loop compensation | External RC network (RCOMP = 49.9 kΩ + CCOMP) stabilizes DC-DC control loop per AN892 guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| RF capacitive isolation | Eliminates optocoupler aging and temperature drift; enables >100-year lifetime and <1 ns jitter in timing-critical applications. |
| Integrated flyback controller | Removes need for external PWM IC, error amp, and optocoupler - reduces BOM count by ≥7 components vs. discrete solutions. |
| Secondary-side voltage sensing | Enables precise load regulation (<±1.5%) without optocoupler biasing circuitry, improving efficiency and simplifying layout. |
| Soft-start & shutdown | Capacitor-programmable SS pin limits inrush current; SH pin allows system-level power sequencing and fault recovery. |
| AEC-Q100 Grade 1 | Validated for automotive environments including traction inverters and BMS, with full PPAP documentation support. |
Applications
| Industrial Motor Control | Automotive Battery Management |
|---|---|
Use Scenario: Isolating gate driver signals and feedback in 3-phase IGBT/SiC inverter stacks for HVAC compressors and EV traction drives. IC Role / Device Role / Timing Role: SI88244EC-ASR provides four isolated logic channels (A1–A4 → B1–B4) plus regulated 5 V/1 A VDDB to power isolated gate drivers and current-sense amplifiers. Use Value: Eliminates separate isolated DC-DC module, reducing board area by 35% and enabling compact, thermally efficient inverter designs. | Use Scenario: Monitoring cell voltages and controlling contactors in high-voltage battery packs (400–800 V) with centralized BMS controllers. IC Role / Device Role / Timing Role: SI88244EC-ASR isolates UART/ISO-SPI communication between MCU and analog front-end while powering isolated ADCs and level-shifted GPIOs from VDDB. Use Value: Achieves reinforced 5 kVRMS isolation barrier meeting ISO 6469-3 requirements without external isolation components. |
| Isolated Switch-Mode Power Supply | PLC Digital I/O Modules |
Use Scenario: Providing isolated feedback and auxiliary power in 24 V input, 5 V/3.3 V output AC-DC or DC-DC converters for factory automation equipment. IC Role / Device Role / Timing Role: SI88244EC-ASR replaces optocoupler + TL431 feedback loop and standalone isolated bias supply, with VSNS directly sensing secondary-side output. Use Value: Improves line/load regulation to ±1.2% and reduces component count by 6 parts, lowering failure rate and qualification effort. | Use Scenario: Conditioning and isolating 24 V digital inputs/outputs in modular PLC backplanes where field-side transients exceed 4 kV. IC Role / Device Role / Timing Role: SI88244EC-ASR delivers four independent isolation channels plus local 5 V VDDB to power opto-LED drivers and protection circuitry on field-side PCBs. Use Value: Enables single-chip isolation + power for 4-channel I/O modules, cutting assembly cost by 22% versus dual-component solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad digital isolator with integrated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6420ARWZ | 4-channel, 50 Mbps max, 2.5 W isolated power, SOIC-20, no programmable shutdown or soft-start. | Limited to lower-power isolated logic; unsuitable for driving gate drivers or high-current ADCs requiring >2 W. | Select when only basic isolation + low-power bias is needed and AEC-Q100 is not required. |
| SI88243EC-ASR | Same Si882xx family, identical pinout and DC-DC architecture, but with 3-channel isolation (A1–A3/B1–B3) and NC on A4/B4. | Reduces channel count for cost-sensitive 3-wire interfaces (e.g., isolated CAN transceivers with enable lines). | Choose when one isolation channel is unused - saves $0.32/unit with no layout change. |
Compared with ADUM6420ARWZ, SI88244EC-ASR delivers double the isolated power (5 W vs. 2.5 W) and higher data rate (100 Mbps vs. 50 Mbps), while SI88243EC-ASR offers identical performance in a 3-channel configuration - making SI88244EC-ASR optimal for full 4-channel, high-power industrial and automotive applications.
Availability
SI88244EC-ASR is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management systems, isolated switch-mode supplies, and PLC digital I/O modules requiring stable component supply across multi-year production cycles.
Supply support for SI88244EC-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 leader in analog and mixed-signal semiconductors, specializing in RF, precision analog, and isolation technologies for high-reliability applications.
The Si88x4x product line was designed to replace optocouplers and discrete isolated power supplies in safety-critical industrial and automotive systems, integrating robust digital isolation with highly regulated isolated DC-DC conversion in a single SOIC package.
FAQ
What is the maximum isolated output power of the SI88244EC-ASR?
The SI88244EC-ASR delivers up to 5 W peak isolated output power at 3.3 V or 5.0 V on the secondary side (VDDB). This power supports both the internal digital isolator receivers and external circuitry such as gate drivers or ADCs. Average continuous output is rated at 2 W at 5.0 V, consistent with thermal limits in SOIC-20 packaging. The SI88244EC-ASR achieves this using internal power switches and does not require an external FET.
Does the SI88244EC-ASR support adjustable DC-DC switching frequency?
No, the SI88244EC-ASR operates at a fixed 250 kHz switching frequency, as defined for the Si882xx family. Unlike Si883xx or Si886xx variants, it lacks SH_FC and SS pins for external RC programming. Frequency adjustment is not supported - design must accommodate 250 kHz EMI filtering and transformer selection per AN892 guidelines.
Can the SI88244EC-ASR be used in automotive applications?
Yes, the SI88244EC-ASR is AEC-Q100 qualified (Grade 1: –40 °C to +125 °C) and built using automotive-specific manufacturing flows. It supports AIAG-compliant PPAP documentation and IMDS/CAMDS reporting. Its 5000 VRMS isolation, 100 kV/µs transient immunity, and reinforced insulation certification make it suitable for traction inverters, battery management systems, and vehicle communication buses.
What is the role of the VSNS pin on the SI88244EC-ASR?
The VSNS pin on the SI88244EC-ASR is the DC-DC converter's feedback input, connected to a resistor divider on the secondary side to precisely regulate VDDB output voltage (e.g., 3.3 V or 5.0 V). It enables secondary-side sensing - eliminating optocoupler-based feedback - resulting in ±1.5% load regulation and simplified layout. The internal error amplifier compares VSNS voltage to a 1.22 V reference and adjusts duty cycle accordingly.
How many isolation channels does the SI88244EC-ASR provide, and are they bidirectional?
The SI88244EC-ASR provides four unidirectional digital isolation channels (A1→B1, A2→B2, A3→B3, A4→B4), each implemented with RF-based capacitive coupling across a silicon dioxide barrier. Channels are strictly unidirectional - no built-in reverse-path capability. For bidirectional protocols like I²C, external logic or additional channels are required. All channels operate simultaneously at up to 100 Mbps with matched propagation delay (≤23 ns).
SI88244EC-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si88x4x
- 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:
- 4
- Inputs - Side 1/Side 2:
- 0/4
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- 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
SI88244EC-ASR FAQ
1.How can I place an order for SI88244EC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88244EC-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 SI88244EC-ASR reliable?
The price and inventory of SI88244EC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88244EC-ASR is usually 5 days.
3.What payment methods are accepted for SI88244EC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88244EC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88244EC-ASR?
SI88244EC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88244EC-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 SI88244EC-ASR?
For technical support, including SI88244EC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88244EC-ASR requirements.
6.How does Aetrix verify that SI88244EC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88244EC-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 SI88244EC-ASR meets industry standards.
7.What is the process for return or replacement of SI88244EC-ASR?
All SI88244EC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88244EC-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 SI88244EC-ASR part is unused and in its original packaging.
Return procedure for SI88244EC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88244EC-ASR Tags
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SI8710AC-B-ISR
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