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Skyworks Solutions Inc. SI88244EC-ISR
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- Part No.:
- SI88244EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88244EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,605
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Product details
Overview
SI88244EC-ISR 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-ISR datasheet, SI88244EC-ISR pinout, SI88244EC-ISR application, or SI88244EC-ISR equivalent, this page delivers verified package mapping (SOIC-20 wide-body), confirmed pin functions (e.g., VSW, VSNS, SH, SS), exact channel configuration (4 unidirectional channels, A1–A4/B1–B4), and validated alternative options for 3.3/5 V isolated power + signal transfer.
Technical Context
The SI88244EC-ISR implements RF-based capacitive isolation across four independent channels using on/off keying modulation, enabling robust noise immunity and zero initialization requirement. Its integrated flyback DC-DC controller operates with internal primary-side switches (VSW) and supports external transformer drive via ESW for >5.5 V input configurations.
Feedback regulation occurs via secondary-side voltage sensing (VSNS), error encoding across the isolation barrier, and peak-current-mode control with external COMP compensation. Shutdown (SH pin), soft-start (SS pin), and fixed 250 kHz switching frequency are implemented per Si882xx family specifications.
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 interface isolation (e.g., SPI, RS-485, CAN FD physical layer) |
| Propagation Delay | ≤23 ns max - ensures tight timing alignment in real-time control loops |
| DC-DC Output Power | Up to 5 W peak - powers isolated logic (VDDB) and external circuitry without auxiliary supply |
| Operating Temp | –40 °C to +125 °C - qualified for automotive under-hood and industrial ambient conditions |
| Transient Immunity | 100 kV/µs typical - withstands fast-rising common-mode noise in motor drives and inverters |
| Regulatory Certifications | UL 1577, CSA 62368-1, VDE 62368-1, CQC GB4943.1 - meets global safety requirements for end-equipment certification |
Pinout & Package
SI88244EC-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 ≥8.3 mm, optimized for reinforced isolation compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 15, 16, 17, 18, 19, 20 | Signal I/O / Power / Control | Includes A1–A4 (primary-side inputs), B1–B4 (secondary-side outputs), VDDP/VDDA/VDDB (power rails), GNDP/GNDA/GNDB (grounds), SH (shutdown), SS (soft-start), VSW (internal switch), VSNS (feedback sense), COMP (compensation), DNC/VREGB (Zener reference for >5.5 V outputs) |
| A1–A4 | Primary-side digital input | Unidirectional CMOS inputs referenced to VDDA/GNDA; accept 3.3 V or 5 V logic |
| B1–B4 | Secondary-side digital output | Unidirectional CMOS outputs powered by VDDB/GNDB; driven by isolated RF receiver |
| VSW | Internal power switch output | Drives primary side of external transformer; rated for ≤5.5 V operation (Si882xx default config) |
| SH | DC-DC shutdown control | Active-high input; disables converter when pulled high; must be grounded for normal operation |
| SS | Soft-start timing node | Connect external capacitor to set startup ramp time; prevents inrush current into isolated load |
| VSNS | Secondary-side feedback input | Resistor-divider input sensing isolated output voltage; enables precise regulation without optocouplers |
| COMP | Loop compensation node | External RC network (RCOMP = 49.9 kΩ, CCOMP calculated per crossover freq.) stabilizes closed-loop control |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC converter | Eliminates need for external isolated power supply; reduces BOM count and PCB area in space-constrained designs |
| RF-based capacitive isolation | Provides 100 kV/µs transient immunity and superior magnetic field rejection vs. optocouplers or inductive isolators |
| Secondary-side voltage sensing | Enables <1% load/line regulation without optocoupler biasing circuitry - improves long-term reliability |
| Programmable soft-start | Capacitor-controlled ramp prevents inrush into downstream loads (e.g., gate drivers, ADC references) |
| Reinforced isolation certification | Meets UL, CSA, VDE, and CQC standards - allows direct use in safety-critical subsystems without additional system-level testing |
| AEC-Q100 qualification | Validated for automotive applications including traction inverters and battery management systems |
Applications
| Industrial Motor Control | Automotive Battery Management |
|---|---|
|
Use Scenario: Isolating gate driver signals and feedback in 3-phase inverter stacks for HVAC compressors and EV traction motors. IC Role / Device Role / Timing Role: SI88244EC-ISR provides simultaneous isolation of PWM inputs (A1–A4) and current-sense ADC outputs (B1–B4), while powering isolated gate driver ICs via its 5 V/5 W DC-DC output. Use Value: Enables compact, single-chip isolation + power architecture with <23 ns channel-to-channel skew - critical for synchronous FET switching and overcurrent protection response. |
Use Scenario: Monitoring cell voltages and temperatures across 12–96 series-connected Li-ion cells in high-voltage battery packs. IC Role / Device Role / Timing Role: SI88244EC-ISR isolates daisy-chained ADC communication (SPI) and powers isolated analog front-ends on each cell module using its regulated 3.3 V output. Use Value: Achieves ±0.5 mV measurement accuracy by eliminating ground loop noise and supplying clean, regulated power directly at point-of-use. |
| Isolated Switch-Mode Power Supply | PLC Digital I/O Module |
|
Use Scenario: Providing feedback and auxiliary power in isolated DC-DC converters for telecom and server PSUs. IC Role / Device Role / Timing Role: SI88244EC-ISR replaces optocoupler + LDO combo by sensing secondary-side output voltage (VSNS), transmitting error signal across barrier, and powering controller ICs on primary side via VDDA rail. Use Value: Improves transient response and line regulation by closing feedback loop on secondary side - eliminates optocoupler CTR drift and temperature dependence. |
Use Scenario: Isolating digital input/output lines between field-side sensors/actuators and backplane CPU in modular PLC chassis. IC Role / Device Role / Timing Role: SI88244EC-ISR handles 4-channel DI status reporting (A1–A4 → B1–B4) and powers isolated LED indicators or solid-state relays via VDDB output. Use Value: Reduces component count per I/O channel by 30% versus discrete isolator + regulator solutions - lowers assembly cost and increases channel density. |
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 |
|---|---|---|---|
| ADUM6421ARWZ | 4-channel isolator + 500 mW isolated DC-DC; uses iCoupler® transformer isolation; no external transformer required; lower output power | Suitable for low-power isolated logic only - cannot drive gate drivers or ADC references requiring >500 mW | Select when board space is constrained and isolated load power ≤500 mW; avoid when >2 W isolated power needed. |
| ISO7844FDWR | 4-channel digital isolator only - no integrated DC-DC; requires external isolated power supply; higher CMTI (100 kV/µs); SOIC-20 package | Requires separate isolated DC-DC converter (e.g., SN6501 + transformer); adds design complexity and BOM cost | Select when highest possible data integrity is required and external power architecture already exists; not suitable as drop-in replacement for SI88244EC-ISR's integrated power capability. |
Compared with ADUM6421ARWZ, SI88244EC-ISR delivers 10× more isolated power (5 W vs. 0.5 W) for driving high-current loads; compared with ISO7844FDWR, it eliminates external power conversion components but trades off slightly lower CMTI margin (100 kV/µs typical vs. 100 kV/µs min).
Availability
SI88244EC-ISR is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management, and isolated switch-mode power supplies requiring stable component supply, long lifecycle support, and certified reinforced isolation.
Supply support for SI88244EC-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 product line was designed to replace optocoupler-based isolation + discrete DC-DC architectures in high-reliability industrial and automotive systems - integrating signal integrity, power delivery, and safety certification into one monolithic device.
FAQ
What is the maximum isolated output power supported by SI88244EC-ISR?
The SI88244EC-ISR supports up to 5 W peak isolated output power when configured with an appropriate external transformer and rectifier diode. This rating applies to both 3.3 V and 5.0 V regulated outputs. Continuous output power depends on thermal design and transformer selection; typical sustained output is 2 W at full load with proper heatsinking and layout per AN892 guidelines. The SI88244EC-ISR achieves this using internal primary-side switches and secondary-side feedback sensing.
Does SI88244EC-ISR require an external transformer?
Yes, the SI88244EC-ISR requires an external miniature transformer to implement its isolated DC-DC function. The device integrates the PWM controller and internal switches (VSW), but relies on an external transformer (e.g., UMEC UTB02240s or Coilcraft TA7618-AL) to provide galvanic isolation and voltage transformation. Transformer selection must match input/output voltage requirements and isolation rating (e.g., 5 kVRMS for reinforced insulation). No transformer is needed for digital isolation functionality alone.
Can SI88244EC-ISR operate with 24 V input?
No, the SI88244EC-ISR is part of the Si882xx family and is specified for 3.0–5.5 V primary-side input only. It uses internal power switches (VSW) rated for ≤5.5 V and lacks the ESW/RSN pins required for external FET drive in high-voltage configurations. For 24 V input applications, Skyworks offers Si884xx or Si886xx variants (e.g., SI88444AC-IS or SI88644AC-IS), which include external switch drivers and current sense inputs.
What is the purpose of the DNC/VREGB pin on SI88244EC-ISR?
The DNC/VREGB pin on SI88244EC-ISR is a Zener-referenced output used only when the isolated DC-DC output exceeds 5.5 V. In standard 3.3 V or 5.0 V configurations, this pin must remain unconnected (DNC). When used, it provides a stable reference for external NPN transistor-based regulation circuits to generate higher isolated voltages (e.g., 12 V or 24 V). Its internal Zener structure prevents misuse in ≤5.5 V designs - connecting it in those cases risks latch-up or regulation instability.
How does SI88244EC-ISR achieve reinforced isolation certification?
The SI88244EC-ISR achieves reinforced isolation certification (UL 1577, CSA 62368-1, VDE 62368-1) through its monolithic capacitive isolation barrier fabricated in silicon dioxide, combined with SOIC-20 wide-body packaging providing ≥8.3 mm creepage and clearance. Certification covers both the digital isolation channels and the integrated DC-DC converter - meaning the entire device, including power transfer path, meets reinforced insulation requirements without requiring additional system-level barriers or spacing.
SI88244EC-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
SI88244EC-ISR FAQ
1.How can I place an order for SI88244EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88244EC-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 SI88244EC-ISR reliable?
The price and inventory of SI88244EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88244EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88244EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88244EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88244EC-ISR?
SI88244EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88244EC-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 SI88244EC-ISR?
For technical support, including SI88244EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88244EC-ISR requirements.
6.How does Aetrix verify that SI88244EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88244EC-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 SI88244EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88244EC-ISR?
All SI88244EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88244EC-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 SI88244EC-ISR part is unused and in its original packaging.
Return procedure for SI88244EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88244EC-ISR Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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