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Skyworks Solutions Inc. SI88441EC-ISR
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- Part No.:
- SI88441EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88441EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,388
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Product details
Overview
SI88441EC-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, delivering up to 5 W output power and supporting data rates up to 100 Mbps. It features four unidirectional isolation channels, 5000 VRMS reinforced isolation, and operates across –40 to +125 °C. It is used in high-reliability industrial inverters and battery management systems where galvanic separation and on-board isolated power are required.
For engineers reviewing the SI88441EC-ISR datasheet, SI88441EC-ISR pinout, SI88441EC-ISR application, or SI88441EC-ISR equivalent, this page provides verified functional specifications, SOIC-20 wide-body package details, confirmed DC-DC configuration (24 V input → 3.3/5 V isolated output), and validated alternative parts for automotive-grade isolated power+signal designs.
Technical Context
The SI88441EC-ISR implements RF-based capacitive isolation with silicon dioxide barriers and a modified flyback DC-DC controller that senses output voltage on the secondary side via VSNS, eliminating optocouplers. Its ESW and RSN pins drive an external NMOS switch and sense primary-side current for high-voltage operation.
This variant belongs to the Si884xx family optimized for high-voltage-to-low-voltage conversion (e.g., 24 V → 3.3/5 V), uses 100 kΩ compensation resistance at COMP, and supports cycle skipping at light loads-unlike Si882xx/3xx with internal switches. Shutdown and soft-start functions are not implemented on Si884xx devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute (UL 1577, reinforced insulation) |
| Data Rate | Up to 100 Mbps - enables high-speed serial interfaces like SPI, RS-485, and CAN FD physical layer isolation |
| Propagation Delay | 23 ns max - ensures tight timing alignment in real-time control loops |
| DC-DC Output Power | Up to 5 W peak with external FET - sufficient to power secondary-side MCU, ADC, and transceivers |
| Operating Temp | –40 °C to +125 °C - qualified for under-hood automotive and industrial motor drive environments |
| Transient Immunity | 100 kV/µs typical - withstands fast-rising noise in switching power converters and motor drives |
| Package | SOIC-20 wide-body (7.5 mm body width) - provides 8.3 mm creepage/clearance for reinforced isolation |
Pinout & Package
SI88441EC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (7.5 mm body width, 1.27 mm pitch), certified for 5000 VRMS isolation. Pin assignments follow Figure 3 (Si8844x) in the datasheet, with dedicated primary- and secondary-side power, ground, signal, and DC-DC control terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDP | Primary-side DC-DC input supply | Accepts 24 V input; requires external decoupling capacitor near pin |
| GNDP | Primary-side DC-DC ground | Must be short-traced to VDDP return path to minimize EMI |
| ESW | External switch driver output | Drives gate of external NMOS FET (Q1) in high-voltage flyback topology |
| RSN | Current sense input | Connects to shunt resistor to monitor primary-side peak current for PWM control |
| VDDA | Primary-side digital isolator supply | Requires ≤5.5 V supply; VREGA may generate it from higher input if needed |
| GNDA | Primary-side digital ground | Separate from GNDP; connected only via shortest possible trace per layout guidelines |
| A1–A4 | Primary-side digital input channels | Unidirectional CMOS inputs; support 0–100 Mbps with 18 ns typical prop delay |
| B1–B4 | Secondary-side digital output channels | Unidirectional CMOS outputs; referenced to VDDB and GNDB |
| VDDB | Secondary-side digital supply | Powered by isolated DC-DC output (e.g., 3.3 V or 5 V); powers downstream logic |
| GNDB | Secondary-side digital ground | Galvanically isolated from GNDA; forms reference for B1–B4 outputs |
| VSNS | DC-DC feedback sense input | Connects to resistor divider on secondary side to regulate isolated output voltage |
| COMP | DC-DC loop compensation node | Requires 100 kΩ series resistor + capacitor to GNDB for Type 1 compensation |
| VREGA | Primary-side voltage reference | Used with external NPN transistor to generate VDDA when input >5.5 V |
| DNC/VREGB | Do-not-connect / secondary-side reference | Must be left open if VDDB ≤5.5 V; internal Zener active only for >5.5 V outputs |
Key Features
| Feature | Design Value |
|---|---|
| RF-based capacitive isolation | Eliminates magnetic coupling sensitivity and enables >100 kV/µs CMTI without ferrite shielding |
| Secondary-side voltage sensing | Enables precise line/load regulation without optocouplers or auxiliary windings |
| External FET control (ESW + RSN) | Supports 24 V primary-side operation while maintaining low-loss switching and thermal efficiency |
| 100 kΩ COMP network | Optimized compensation for Si884xx's flyback controller with external switch, reducing design iterations |
| AEC-Q100 qualified | Validated for automotive applications including traction inverters and battery management systems |
Applications
| Industrial Inverter Control | Automotive Battery Management |
|---|---|
|
Use Scenario: Isolating gate-drive signals and feedback from IGBT/SiC modules in 3-phase motor drives. IC Role / Device Role / Timing Role: Provides four independent isolated data paths plus 5 V/200 mA isolated supply for gate drivers and ADC references. Use Value: Enables compact, single-chip isolation + power solution replacing discrete optocoupler + DC-DC combinations, reducing BOM count by ≥3 components. |
Use Scenario: Monitoring cell voltages and temperatures across 96-cell EV battery packs with centralized MCU. IC Role / Device Role / Timing Role: Transfers analog front-end data and control commands across isolation barrier while powering secondary-side sensor interface ICs. Use Value: Delivers 5000 VRMS isolation and AEC-Q100 qualification required for ASIL-C functional safety compliance in high-voltage battery domains. |
| Programmable Logic Controller I/O | Medical Isolated Data Acquisition |
|
Use Scenario: Digitally isolating 24 V DC field inputs and relay outputs in distributed control cabinets. IC Role / Device Role / Timing Role: Four bidirectional-capable channels (via external direction control) and isolated 5 V rail for level-shifting and protection circuitry. Use Value: Supports 24 V field-side operation with integrated RSN/ESW control, eliminating need for separate isolated DC-DC and digital isolators. |
Use Scenario: Isolating patient-connected ECG/EEG front-ends from hospital-grade mains-powered processing units. IC Role / Device Role / Timing Role: Provides reinforced 5000 VRMS isolation and ultra-low emissions for Class II medical device EMC compliance. Use Value: Meets IEC 60601-1 creepage/clearance requirements in SOIC-20 wide-body package without additional spacing or potting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel isolated power+signal applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88442EC-ISR | Same SOIC-20 package and Si884xx architecture; differs only in failsafe output state (high vs. low) on channel A1 during power loss | Preferred where default-high fail-safe behavior is required for safety-critical enable signals | Select SI88442EC-ISR if system-level fault response mandates active-high default on primary-side control channel |
| ADUM6421ARIZ | Analog Devices part with integrated 500 mW isolated DC-DC (vs. 5 W peak here); uses iCoupler® transformer isolation; no external FET support | Suitable for low-power isolated logic but cannot replace SI88441EC-ISR in 24 V→5 V, >1 W load scenarios | Choose ADUM6421ARIZ only for space-constrained, low-power (<500 mW) applications where external transformer integration is undesirable |
Compared with SI88441EC-ISR, SI88442EC-ISR offers identical power capability and pinout but different failsafe logic polarity, while ADUM6421ARIZ trades 10× lower isolated power and no external FET flexibility for smaller footprint and simpler magnetics-making it unsuitable as a drop-in replacement in high-power industrial or automotive use cases.
Availability
SI88441EC-ISR is available at Aetrix Electronics and suitable for industrial automation systems, battery management systems, and medical data acquisition requiring stable component supply with automotive-grade reliability and long-term lifecycle support.
Supply support for SI88441EC-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 for wireless, automotive, and industrial markets.
The Si88xx family was designed to replace optocoupler + discrete DC-DC combinations in high-reliability applications demanding reinforced isolation, high data rate, and integrated isolated power-especially where 24 V primary-side operation and AEC-Q100 compliance are mandatory.
FAQ
What is the maximum isolated DC-DC output power supported by SI88441EC-ISR?
The SI88441EC-ISR supports up to 5 W peak isolated output power when used with an appropriately rated external NMOS FET, transformer, and rectifier. This is achieved in high-voltage configurations (e.g., 24 V input → 5 V output). Average continuous power depends on thermal design and layout but typically sustains ≥2 W in standard SOIC-20 PCB footprints with 2 oz copper and thermal vias.
Does SI88441EC-ISR include shutdown or soft-start functionality?
No-SI88441EC-ISR does not implement shutdown (SH) or soft-start (SS) functions. These features are explicitly excluded from the Si884xx family per Section 2.3.1 of the datasheet. The device relies on external circuitry (e.g., enable sequencing or input UVLO) for controlled startup and disable. Pin 6 (SH) is not assigned on SI88441EC-ISR.
Which transformer part numbers are validated for use with SI88441EC-ISR in 24 V input applications?
Validated transformers for SI88441EC-ISR in 24 V input configurations include UMEC UTB02250s (7–24 V → 3.3–5.5 V, 3:1 turns ratio) and Mentech TTER09-0458S1 (8–24 V → 8–24 V, 1:1). Both meet 5 kVRMS isolation and specified leakage inductance limits. Refer to Table 2 in the datasheet for full parametric validation and AN901 for design guidance.
How is the DC-DC output voltage regulated on SI88441EC-ISR?
SI88441EC-ISR regulates its isolated DC-DC output voltage using secondary-side sensing: a resistor divider connects the VDDB output to VSNS, feeding back to an internal error amplifier. The resulting error signal is transmitted across the isolation barrier to adjust the duty cycle of the external FET driven by ESW-enabling precise regulation without optocouplers or auxiliary windings.
Is SI88441EC-ISR pin-compatible with other Si884xx variants like SI88440 or SI88442?
Yes-SI88441EC-ISR shares identical SOIC-20 pinout and electrical interface with all Si884xx variants (SI88440, SI88442, SI88443, SI88444). Differences are limited to failsafe output states and internal configuration fuses; no PCB layout changes are required when substituting within the Si884xx family.
SI88441EC-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:
- 3/1
- 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:
- 20-SOIC
SI88441EC-ISR FAQ
1.How can I place an order for SI88441EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88441EC-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 SI88441EC-ISR reliable?
The price and inventory of SI88441EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88441EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88441EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88441EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88441EC-ISR?
SI88441EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88441EC-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 SI88441EC-ISR?
For technical support, including SI88441EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88441EC-ISR requirements.
6.How does Aetrix verify that SI88441EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88441EC-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 SI88441EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88441EC-ISR?
All SI88441EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88441EC-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 SI88441EC-ISR part is unused and in its original packaging.
Return procedure for SI88441EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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