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Skyworks Solutions Inc. SI88440EC-ISR
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- Part No.:
- SI88440EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88440EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,944
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Product details
Overview
SI88440EC-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, delivering up to 5 W output power at 3.3 V or 5.0 V, supporting data rates up to 100 Mbps and propagation delay ≤23 ns. It features external switch driver (ESW), current sense (RSN), and secondary-side feedback (VSNS) for high-voltage input configurations (e.g., 24 V to 5 V), used in traction inverters and battery management systems.
For engineers reviewing the SI88440EC-ISR datasheet, SI88440EC-ISR pinout, SI88440EC-ISR application, or SI88440EC-ISR equivalent, this page provides verified functional architecture, SOIC-20 wide-body package mapping, confirmed 4-channel unidirectional isolation, integrated flyback controller with external FET support, and validated alternative options for high-input-voltage isolated power + signal transfer.
Technical Context
The SI88440EC-ISR implements four independent RF-based capacitive isolation channels using on/off keying modulation across a silicon dioxide barrier, enabling robust noise immunity and no-startup initialization. Its DC-DC subsystem uses peak-current-mode-controlled flyback topology with external primary-side NMOS switch driven by ESW and current sensing via RSN.
This variant belongs to the Si884xx series optimized for high-input-voltage operation (≥5.5 V primary), requiring external power switch and transformer. It lacks SH/SH_FC shutdown and SS soft-start pins-features reserved for Si883xx/Si886xx-confirming fixed-frequency (250 kHz default) and no user-programmable startup control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS (UL 1577), reinforced insulation per IEC 62368-1 |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485, CAN FD |
| Propagation Delay | ≤23 ns max - enables precise timing-critical applications such as motor gate drive synchronization |
| DC-DC Output Power | Up to 5 W peak with external FET - sufficient to power secondary-side MCU, ADC, and transceivers |
| Input Voltage Range | Primary side: up to 24 V - designed for industrial bus or automotive battery rail inputs |
| Transient Immunity | 100 kV/µs (typical) - withstands fast-rising common-mode noise in motor drives and inverters |
| Operating Temp | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient conditions |
Pinout & Package
SI88440EC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 1.27 mm pitch), rated for 5000 VRMS isolation and creepage/clearance compliant with reinforced insulation standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 9, 10, 14, 13, 7, 8 | HF XMTR / HF RCVR (A1–A4, B1–B4) | Four unidirectional digital isolation channels: A-side inputs (XMTR), B-side outputs (RCVR) |
| 11, 12, 15, 16, 17, 18, 19, 20 | GNDP, RSN, ESW, VDDA, GNDA, VREGA, GNDB, VDDB | Primary-side ground/power (GNDP/VDDA), external switch driver (ESW), current sense (RSN), reference (VREGA); secondary-side power/ground (VDDB/GNDB) |
| 11, 12, 15, 16, 17, 18, 19, 20 | VSNS, COMP, DNC/VREGB, NC | Secondary-side feedback (VSNS), compensation network (COMP), Zener-referenced VREGB (for >5.5 V outputs), no-connect (NC) |
Key Features
| Feature | Design Value |
|---|---|
| RF-based capacitive isolation | Eliminates magnetic coupling sensitivity and enables >100 kV/µs CMTI without external filtering |
| Integrated flyback controller with ESW driver | Supports external 60 V+ NMOS switch for primary-side voltages up to 24 V, improving efficiency vs. internal-switch variants |
| Secondary-side voltage sensing (VSNS) | Enables precise regulation (<±3%) without optocouplers or secondary-side bias supplies |
| Compensation-ready COMP pin | Internal 100 kΩ resistor enables stable Type-1 loop compensation with external RCOMP/CCOMP |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including battery management and traction inverter control |
Applications
| Industrial Motor Control | Traction Inverter Gate Drive |
|---|---|
|
Use Scenario: Isolated PWM signal transmission and auxiliary 5 V supply generation for IGBT/SiC gate drivers in variable-frequency drives. IC Role / Device Role / Timing Role: Provides four independent isolated logic channels plus regulated 5 V/1 A secondary power from 24 V DC bus. Use Value: Eliminates need for separate isolated DC-DC module and discrete isolators, reducing BOM count and PCB area by >40%. |
Use Scenario: Signal and power isolation between MCU domain and high-side/lower-side gate driver stages in EV traction inverters. IC Role / Device Role / Timing Role: Delivers synchronized, low-propagation-delay isolated gate signals (≤23 ns) and powers isolated gate driver ICs from vehicle 12/24 V battery. Use Value: Enables safe, compact, and EMC-robust gate drive architecture meeting ISO 26262 ASIL-B requirements. |
| Battery Management Systems | Isolated Data Acquisition |
|
Use Scenario: Cell voltage monitoring and pack-level communication isolation in high-voltage EV battery packs (up to 900 V). IC Role / Device Role / Timing Role: Transfers isolated analog front-end status and control commands while powering isolated ADCs and isolating CAN FD bus transceivers. Use Value: Achieves reinforced insulation barrier with single-component solution, simplifying certification to UL 62368-1 and IEC 61000-4-5. |
Use Scenario: High-precision sensor data acquisition in noisy industrial environments (e.g., PLC analog input modules). IC Role / Device Role / Timing Role: Isolates SPI or parallel interface lines between microcontroller and delta-sigma ADC, while supplying clean 3.3 V to ADC reference and digital core. Use Value: Maintains 16-bit effective resolution under 10 kV surge conditions due to 100 kV/µs CMTI and low-noise isolated power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel isolated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88442EC-ISR | Same SOIC-20 package and pinout; differs only in failsafe state (A-side defaults high vs. low) | Suitable where default-high logic on isolated outputs is required during power loss or fault | Select SI88442EC-ISR if system safety logic mandates active-high default behavior on channel A outputs |
| ADUM6420ARWZ | 4-channel isolator + integrated DC-DC (500 mW, not 5 W); uses transformer-based isolation; no ESW/RSN pins | Limited to low-power secondary loads (e.g., small MCU only); unsuitable for driving gate drivers or multi-peripheral rails | Choose ADUM6420ARWZ only for space-constrained, low-power applications where <500 mW isolated supply suffices |
Compared with SI88440EC-ISR, SI88442EC-ISR offers identical power and isolation performance but different failsafe polarity, while ADUM6420ARWZ provides simpler integration at the cost of 10× lower isolated power and no external switch flexibility-making SI88440EC-ISR the sole option for high-power, high-voltage, field-serviceable designs.
Availability
SI88440EC-ISR is available at Aetrix Electronics and suitable for traction inverters, battery management systems, and industrial motor control requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for SI88440EC-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 Si88xx family was engineered to replace optocoupler + discrete DC-DC combinations in high-reliability industrial and automotive systems, integrating robust capacitive isolation with flexible, high-efficiency isolated power conversion.
FAQ
What is the maximum isolated output power supported by the SI88440EC-ISR?
The SI88440EC-ISR supports up to 5 W peak isolated output power when used with an appropriately rated external NMOS switch, transformer, and rectifier. This is achieved in high-input-voltage configurations (e.g., 24 V primary to 5 V secondary) and exceeds the 2 W limit of internal-switch variants like the Si882xx. Actual continuous power depends on thermal design and component selection per AN901.
Does the SI88440EC-ISR include a shutdown pin for the DC-DC converter?
No, the SI88440EC-ISR does not include a shutdown (SH) pin. Shutdown functionality is explicitly excluded from the Si884xx series per datasheet Section 2.3.1, which states "This feature is not available on the Si884xx." The device operates continuously when powered; external enable control must be implemented via primary-side VDDA sequencing or upstream regulator.
Which transformer part numbers are validated for use with the SI88440EC-ISR in 24 V to 5 V conversion?
Validated transformers for SI88440EC-ISR in 24 V → 5 V applications include UMEC UTB02250s (3.0:1.0 turns ratio, 5 kVRMS), Coilcraft TA7788-AL (1.00:1.25:0.75, 5 kVRMS), and Mentech TTER09-0458S1 (1.0:1.0, 5 kVRMS). These meet leakage inductance, primary inductance, and isolation rating requirements specified in Table 2 of the Si88x4x datasheet.
Can the SI88440EC-ISR generate an isolated 24 V output?
Yes, the SI88440EC-ISR supports isolated 24 V output when configured in high-voltage-to-high-voltage mode (e.g., 24 V input to 24 V output), as confirmed in Section 2.3.13. This requires appropriate resistor divider scaling on VSNS, external transformer with 1:1 turns ratio (e.g., Mentech TTER09-0458S1), and careful compensation network design per AN901 guidelines.
What is the purpose of the RSN pin on the SI88440EC-ISR?
The RSN (current sense) pin on the SI88440EC-ISR provides primary-side current feedback to the internal flyback controller when used with an external NMOS switch. It connects to a shunt resistor between the switch source and ground, enabling cycle-by-cycle current limiting and accurate peak-current-mode control-critical for stable operation at high input voltages and variable load conditions.
SI88440EC-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 20-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:
- 4
- Inputs - Side 1/Side 2:
- 4/0
- 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:
- 20-SOIC
SI88440EC-ISR FAQ
1.How can I place an order for SI88440EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88440EC-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 SI88440EC-ISR reliable?
The price and inventory of SI88440EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88440EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88440EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88440EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88440EC-ISR?
SI88440EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88440EC-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 SI88440EC-ISR?
For technical support, including SI88440EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88440EC-ISR requirements.
6.How does Aetrix verify that SI88440EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88440EC-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 SI88440EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88440EC-ISR?
All SI88440EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88440EC-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 SI88440EC-ISR part is unused and in its original packaging.
Return procedure for SI88440EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88440EC-ISR Tags
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