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Skyworks Solutions Inc. SI88444EC-ISR
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- Part No.:
- SI88444EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88444EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,576
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Product details
Overview
SI88444EC-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, designed for high-voltage input (up to 24 V) to isolated 3.3/5.0 V or 24 V output configurations. It delivers up to 5 W peak isolated power, supports data rates up to 100 Mbps, achieves ≤23 ns propagation delay, and provides 5000 VRMS reinforced isolation. It is used in traction inverters and battery management systems where primary-side voltage exceeds 5.5 V.
For engineers reviewing the SI88444EC-ISR datasheet, SI88444EC-ISR pinout, SI88444EC-ISR application, or SI88444EC-ISR equivalent, this page delivers verified specifications, SOIC-20 wide-body package mapping, confirmed pin functions (including ESW, RSN, VSNS, COMP), and validated alternative parts for high-voltage isolated power + signal transfer designs.
Technical Context
The SI88444EC-ISR implements a modified flyback topology with external NMOS switch drive via ESW and current sensing via RSN, enabling robust operation at input voltages up to 24 V. Its digital isolation channels use RF on/off keying across a silicon dioxide barrier, delivering 100 Mbps data rate and 18 ns typical propagation delay.
It features secondary-side voltage sensing (VSNS), Type 1 loop compensation (RCOMP = 100 kΩ, CCOMP calculated per crossover frequency), and thermal shutdown protection. Unlike Si882xx/3xx, it lacks SH/SH_FC and SS pins - shutdown and soft-start are not supported, and switching frequency is fixed at 250 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for one minute (UL 1577, reinforced insulation) |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485, and CAN FD physical layer signaling |
| Propagation Delay | ≤23 ns max - enables precise timing-critical control loops in motor drives and inverters |
| DC-DC Output Power | Up to 5 W peak - sufficient to power isolated gate drivers, ADCs, and microcontrollers on secondary side |
| Input Voltage Range | Up to 24 V on primary side - requires external FET (Q1) and sense resistor (R4), unlike low-voltage variants |
| Compensation Resistance | 100 kΩ at COMP pin - matches internal resistance for stable Type 1 loop compensation in high-voltage mode |
| Operating Temperature | –40 °C to +125 °C - qualified for automotive under-hood and industrial harsh-environment applications |
Pinout & Package
SI88444EC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 1.27 mm pitch) with creepage/clearance optimized for 5000 VRMS isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 | Digital I/O / Power / Control | Includes A1–A4 (primary-side inputs), B1–B4 (secondary-side outputs), VDDA/GNDA (primary signal supply), VDDB/GNDB (secondary signal supply), GNDP (primary power ground), ESW (external switch driver), RSN (current sense input), VSNS (feedback input), COMP (compensation node), VREGA (voltage reference), DNC/VREGB (Zener-referenced output for >5.5 V outputs), and NC (no-connect) |
| VDDA | Primary-side signal power supply | Must be ≤5.5 V; if unavailable, VREGA + external NPN supplies regulated VDDA |
| ESW | External switch driver output | Drives gate of external NMOS (Q1); enables high-voltage primary-side operation (>5.5 V) |
| RSN | Current sense input | Connects to shunt resistor for peak-current-mode control of external FET |
| VSNS | Secondary-side feedback input | Accepts resistor-divider voltage from isolated output to enable precise regulation without optocouplers |
| COMP | Compensation node | Requires external R (100 kΩ) + C network for stable closed-loop control of flyback converter |
Key Features
| Feature | Design Value |
|---|---|
| Integrated isolated DC-DC converter | Eliminates need for separate isolated power supply; supports 24 V → 3.3/5/24 V conversion with external FET and transformer |
| RF-based digital isolation | Capacitive SiO₂ barrier with on/off keying delivers best-in-class noise immunity (100 kV/µs transient immunity) and low EMI |
| Secondary-side voltage sensing | VSNS pin enables accurate line/load regulation without optocouplers or bias circuitry - improves reliability and reduces BOM count |
| AEC-Q100 qualified | Validated for automotive applications including traction inverters and battery management systems |
| Thermal shutdown protection | Prevents permanent damage during over-temperature events; activates before junction temperature reaches destructive levels |
Applications
| Motor Drive Gate Driver Isolation | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating PWM signals and providing isolated auxiliary power to IGBT/SiC gate drivers in 3-phase motor drives. IC Role / Device Role / Timing Role: SI88444EC-ISR transmits timing-critical gate signals (A1–A4 → B1–B4) while powering gate driver ICs via its 5 W isolated DC-DC output. Use Value: Enables compact, single-chip isolated power + signal solution - eliminates discrete DC-DC + optocoupler combinations and reduces PCB area by >40%. |
Use Scenario: Controlling high-power SiC modules in EV traction inverters where primary bus voltage reaches 800 V and gate drive must be isolated at 24 V input. IC Role / Device Role / Timing Role: SI88444EC-ISR receives MCU PWM commands on VDDA side and delivers synchronized, low-propagation-delay outputs to isolated gate drivers on VDDB side, powered from 24 V bus. Use Value: Supports 24 V → 15 V isolated output (with UTB02250s transformer) and 100 Mbps data rate - meets ASIL-D timing and safety requirements for torque control loops. |
| Battery Management System (BMS) Cell Monitoring | Industrial PLC Analog Input Isolation |
|
Use Scenario: Isolating voltage/current measurement data from 400–800 V battery packs to MCU side while powering isolated ADCs and references. IC Role / Device Role / Timing Role: SI88444EC-ISR provides four isolated digital channels for SPI communication with isolated ADCs and supplies regulated 5 V to those peripherals via its DC-DC output. Use Value: Achieves 5000 VRMS isolation and –40 °C to +125 °C operation - satisfies IEC 62619 and UL 62368-1 for high-voltage energy storage systems. |
Use Scenario: Isolating analog front-end digital control lines (e.g., SPI to isolated ADCs) and powering isolated sensor signal conditioning circuits in factory automation PLCs. IC Role / Device Role / Timing Role: SI88444EC-ISR replaces optocoupler + DC-DC combos in modular I/O cards, delivering 4 isolated bidirectional data paths and 5 W isolated power from 24 V rail. Use Value: Reduces component count by 6+ parts per channel and supports 25+ year lifetime - critical for industrial equipment with long maintenance cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel isolated power + signal transfer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88440EC-ISR | Same SOIC-20 package and pinout; differs only in failsafe output state (default low vs. default high on B1–B4 during loss of input) | Preferred when system safety logic requires de-energized default state (e.g., brake activation in motion control) | Select SI88440EC-ISR if failsafe behavior must assert low on all outputs during fault; otherwise SI88444EC-ISR is drop-in compatible |
| ADUM6420ARWZ | 4-channel isolator + 500 mW isolated DC-DC (vs. 5 W); uses iCoupler magnetic isolation; no external FET support; fixed 3.3 V output only | Suitable for low-power MCU interfaces but cannot drive gate drivers or high-current loads requiring >500 mW | Choose ADUM6420ARWZ only for space-constrained, low-power applications where 500 mW suffices; SI88444EC-ISR is required for >1 W loads |
Compared with SI88440EC-ISR, SI88444EC-ISR offers identical performance and layout compatibility but with active-high failsafe behavior; compared with ADUM6420ARWZ, it delivers 10× more isolated power and supports flexible 3.3/5/24 V outputs via external components - making it the only viable option for high-power isolated subsystems.
Availability
SI88444EC-ISR is available at Aetrix Electronics and suitable for traction inverters, battery management systems, and industrial motor drives requiring stable component supply, AEC-Q100 qualification, and 5000 VRMS isolation compliance.
Supply support for SI88444EC-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 Si88x4x family was engineered specifically for high-reliability, high-voltage isolated power + signal transfer in automotive and industrial systems - addressing the need for integrated, certified, and field-proven alternatives to discrete optocoupler + DC-DC designs.
FAQ
What is the maximum isolated output power of the SI88444EC-ISR?
The SI88444EC-ISR supports up to 5 W peak isolated output power when used with an appropriate external NMOS switch (Q1), transformer (e.g., UTB02250s), and compensation network. This is achieved in high-voltage configurations (e.g., 24 V input to 5 V or 24 V output) and exceeds the capability of most integrated isolated DC-DC solutions. Average output power is typically 2 W at 5 V.
Does the SI88444EC-ISR support programmable switching frequency or soft-start?
No. The SI88444EC-ISR has a fixed 250 kHz switching frequency and does not include SH/SH_FC or SS pins - unlike Si883xx/Si886xx variants. Shutdown and soft-start functions are not implemented in this part. Designers must rely on external circuitry or system-level control for sequencing and emissions management.
Which transformer is recommended for 24 V input to 5 V isolated output with the SI88444EC-ISR?
The UMEC UTB02250s transformer is validated for 7–24 V input to 3.3–5.5 V output with SI88444EC-ISR. It provides a 3.0:1 turns ratio, ≤600 nH leakage inductance, 25 µH ±5% primary inductance, and 5 kVRMS isolation - meeting safety and efficiency requirements for automotive and industrial applications.
How is the SI88444EC-ISR different from the SI88244EC-ISR?
The SI88444EC-ISR is designed for high-voltage primary-side operation (up to 24 V) using external FET drive (ESW) and current sensing (RSN), while the SI88244EC-ISR integrates internal power switches and targets ≤5.5 V inputs. They share identical digital isolation specs (100 Mbps, 23 ns) and SOIC-20 packaging, but pin functions and DC-DC architecture differ significantly - they are not pin-compatible replacements.
What safety certifications does the SI88444EC-ISR hold?
The SI88444EC-ISR is UL 1577 recognized (5000 VRMS, 1 min), CSA certified to 62368-1 (reinforced insulation), VDE certified to 62368-1, and CQC approved per GB4943.1. It is also AEC-Q100 qualified for automotive applications, with full PPAP documentation and IMDS/CAMDS support available.
SI88444EC-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:
- 0/4
- 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
SI88444EC-ISR FAQ
1.How can I place an order for SI88444EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88444EC-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 SI88444EC-ISR reliable?
The price and inventory of SI88444EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88444EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88444EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88444EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88444EC-ISR?
SI88444EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88444EC-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 SI88444EC-ISR?
For technical support, including SI88444EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88444EC-ISR requirements.
6.How does Aetrix verify that SI88444EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88444EC-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 SI88444EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88444EC-ISR?
All SI88444EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88444EC-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 SI88444EC-ISR part is unused and in its original packaging.
Return procedure for SI88444EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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