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Skyworks Solutions Inc. SI88240EC-ISR
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- Part No.:
- SI88240EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88240EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,434
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Product details
Overview
SI88240EC-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, delivering up to 2 W output power at 3.3 V or 5.0 V, supporting data rates up to 100 Mbps, propagation delay ≤23 ns, and 5000 VRMS isolation. It serves as a signal and power isolation solution in industrial motor control and PLC I/O modules.
For engineers reviewing the SI88240EC-ISR datasheet, SI88240EC-ISR pinout, SI88240EC-ISR application, or SI88240EC-ISR equivalent, this page provides verified functional specifications, SOIC-20 wide-body package details, transformer-coupled flyback DC-DC architecture, and validated alternative options for industrial and automotive isolated power + signal designs.
Technical Context
The SI88240EC-ISR implements four unidirectional CMOS isolation channels using RF on/off keying across a silicon dioxide capacitive barrier, enabling robust noise immunity and zero-startup initialization. Its integrated DC-DC controller operates in peak current mode with secondary-side voltage sensing via VSNS and closed-loop feedback transmitted across the isolation barrier.
This variant uses internal power switches (VSW), supports 3.3/5.0 V input-to-isolated 3.3/5.0 V output configurations, includes shutdown (SH pin), soft-start (SS pin), and fixed 250 kHz switching frequency - all confirmed for Si882xx family and explicitly assigned to SI88240 in Figure 1 and Table 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute (UL 1577 certified); enables reinforced insulation per IEC 62368-1 in safety-critical systems. |
| Data Rate | Up to 100 Mbps; supports high-speed serial interfaces like SPI, RS-485 transceiver control, and real-time encoder feedback. |
| Propagation Delay | ≤23 ns max; ensures tight timing alignment between isolated control and feedback signals in motor gate drivers. |
| DC-DC Output Power | 2 W average at 5.0 V; sufficient to power secondary-side microcontrollers, ADCs, and isolated transceivers without external regulators. |
| Operating Temp | –40 °C to +125 °C; qualified for under-hood automotive and industrial ambient environments. |
| Transient Immunity | 100 kV/µs typical; withstands fast EFT/burst events in noisy factory-floor or EV inverter subsystems. |
| Package | SOIC-20 wide-body (7.5 mm body width); provides creepage/clearance ≥8.3 mm for 5000 VRMS isolation compliance. |
Pinout & Package
SI88240EC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (7.5 mm body width, 1.27 mm pitch), optimized for 5000 VRMS reinforced insulation with ≥8.3 mm creepage and clearance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | A1–A4 (Primary-side inputs) | Unidirectional digital input channels referenced to GNDA; drive HF XMTR circuitry for isolation barrier transmission. |
| 5, 6 | GNDP, VSW | GNDP: primary-side power ground; VSW: internal switch output driving transformer primary - no external FET required. |
| 7, 8 | VDDP, VDDA | VDDP: primary-side DC-DC power supply (3.3/5.0 V); VDDA: primary-side digital logic supply (same domain as A1–A4). |
| 9–12 | GNDA, SH, A3, A4 | GNDA: primary-side signal ground; SH: active-high shutdown for DC-DC; A3/A4: additional primary input channels. |
| 13–16 | B1–B4 | Unidirectional digital outputs referenced to GNDB; receive demodulated signals from HF RCVR after crossing isolation barrier. |
| 17, 18 | GNDB, VDDB | GNDB: secondary-side signal ground; VDDB: secondary-side digital logic supply - powered directly by integrated DC-DC. |
| 19, 20 | VSNS, COMP | VSNS: feedback input for regulated DC-DC output voltage sensing; COMP: compensation node for error amplifier loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC with secondary sensing | Eliminates optocoupler-based feedback, improving load regulation accuracy and reducing BOM count by ≥3 components. |
| RF-based isolation architecture | Delivers 100 kV/µs transient immunity and immunity to magnetic fields - critical for gate driver and current-sense isolation. |
| Programmable soft-start (SS pin) | External capacitor sets inrush current ramp rate, preventing input rail collapse during power-up in multi-rail systems. |
| Shutdown control (SH pin) | Active-high assertion disables DC-DC output while preserving digital channel operation - enables safe system-level power sequencing. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including battery management and traction inverter control without derating. |
Applications
| Industrial Motor Control | PLC Digital I/O Modules |
|---|---|
Use Scenario: Isolating PWM gate drive signals and current-sense feedback in 3-phase inverter stacks. IC Role / Device Role / Timing Role: SI88240EC-ISR provides simultaneous isolated power (VDDB) and four-channel signal isolation for high-side/low-side gate drivers and analog front-end ADCs. Use Value: Enables compact, single-chip isolation of both power and control paths - eliminates need for separate isolated DC-DC and digital isolators. |
Use Scenario: Providing channel-by-channel isolation for 24 V digital input/output terminals in modular PLC backplanes. IC Role / Device Role / Timing Role: SI88240EC-ISR delivers independent 3.3 V or 5.0 V isolated supplies and bidirectional-compatible unidirectional channels for status reporting and command execution. Use Value: Reduces PCB area by 40% vs. discrete isolator + regulator solutions while maintaining >5000 VRMS working voltage per channel. |
| Isolated Switch-Mode Power Supplies | Automotive Battery Management Systems |
Use Scenario: Secondary-side sensing and feedback isolation in isolated DC-DC converters for telecom or server PSUs. IC Role / Device Role / Timing Role: SI88240EC-ISR supplies isolated 5.0 V to secondary-side controller ICs while transmitting voltage/current telemetry across barrier via VSNS and digital channels. Use Value: Achieves ±1% load regulation without optocouplers - improves efficiency and long-term reliability over temperature. |
Use Scenario: Isolating cell voltage monitoring and balancing control signals between high-voltage battery pack and low-voltage MCU in EV BMS. IC Role / Device Role / Timing Role: SI88240EC-ISR powers isolated ADCs and digital isolates CAN interface control lines and fault signals across 5000 VRMS barrier. Use Value: Meets ASIL-B functional safety requirements via dual-certified isolation (UL + VDE) and AEC-Q100 Grade 1 operation. |
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 |
|---|---|---|---|
| ADUM6420ARWZ | 4-channel isolator + 500 mW isolated DC-DC; uses iCoupler® transformer isolation; lower output power; no programmable shutdown/soft-start. | Suitable for low-power sensor interfaces but insufficient for powering isolated MCUs or transceivers requiring >1 W. | Select when board space is constrained and secondary-side load < 100 mA; avoid when >2 W isolated power or automotive qualification needed. |
| ISO7844FDWW | 4-channel isolator only - no integrated DC-DC; requires external isolated power supply; 100 Mbps, 11 ns prop delay; 8000 VRMS rating. | Used where isolated power is already available (e.g., from separate DC-DC module) and ultra-low propagation delay is mandatory. | Select when system already includes high-efficiency isolated DC-DC and timing-critical SPI/CAN isolation is prioritized over integration. |
Compared with ADUM6420ARWZ and ISO7844FDWW, SI88240EC-ISR uniquely combines 2 W isolated power, AEC-Q100 qualification, programmable shutdown/soft-start, and 5000 VRMS certification in a single SOIC-20 package - making it optimal for space-constrained industrial and automotive subsystems requiring self-contained isolation.
Availability
SI88240EC-ISR is available at Aetrix Electronics and suitable for industrial motor control, PLC I/O modules, and automotive battery management systems requiring stable component supply, long lifecycle support, and certified reinforced isolation.
Supply support for SI88240EC-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 with higher reliability, tighter timing, and integrated isolated power - targeting industrial automation, medical electronics, and electric vehicle subsystems.
FAQ
What is the maximum isolated DC-DC output power of SI88240EC-ISR?
The SI88240EC-ISR delivers up to 2 W average isolated output power at 5.0 V, sufficient to power secondary-side microcontrollers, isolated transceivers, and precision ADCs. Peak power capability reaches 5 W briefly, but continuous operation is rated at 2 W per the datasheet's thermal limits and SOIC-20 package constraints. This output powers VDDB directly and can supply auxiliary loads.
Does SI88240EC-ISR support 24 V input configurations?
No, SI88240EC-ISR is part of the Si882xx series and supports only 3.3 V or 5.0 V primary-side input voltages. It is not rated for 24 V input operation - that capability belongs to Si884xx/Si886xx variants with external switch drivers (ESW/RSN pins). Using 24 V on VDDP would exceed absolute maximum ratings and cause permanent damage to SI88240EC-ISR.
How is the DC-DC output voltage set on SI88240EC-ISR?
The DC-DC output voltage on SI88240EC-ISR is set externally using a resistor divider (R1/R2) connected to the VSNS pin. The internal error amplifier compares the divided VSNS voltage to a 1.22 V reference; the output equation is VOUT = 1.22 × (1 + R1/R2). No programming pins or EEPROM are involved - adjustment is purely analog and hardware-configurable.
Is SI88240EC-ISR pin-compatible with other Si882xx variants like SI88241EC-ISR?
Yes, all Si882xx variants including SI88240EC-ISR, SI88241EC-ISR, and SI88242EC-ISR share identical SOIC-20 pinouts and package dimensions. Differences lie solely in channel direction configuration (e.g., all-transmit vs. mixed) and failsafe defaults - electrical pin functions and physical layout are fully compatible for drop-in replacement within the same Si882xx subfamily.
What transformer is recommended for use with SI88240EC-ISR?
Skyworks validates the UMEC UTB02240s and Coilcraft TA7618-AL transformers for SI88240EC-ISR in 5 V input → 5 V output configurations. Both provide 1:4 turns ratio, ≤100 nH leakage inductance, 2 µH ±5% primary inductance, and 5 kVRMS isolation - meeting the exact parametric requirements specified in AN892 for Si882xx devices.
SI88240EC-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
SI88240EC-ISR FAQ
1.How can I place an order for SI88240EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88240EC-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 SI88240EC-ISR reliable?
The price and inventory of SI88240EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88240EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88240EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88240EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88240EC-ISR?
SI88240EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88240EC-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 SI88240EC-ISR?
For technical support, including SI88240EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88240EC-ISR requirements.
6.How does Aetrix verify that SI88240EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88240EC-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 SI88240EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88240EC-ISR?
All SI88240EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88240EC-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 SI88240EC-ISR part is unused and in its original packaging.
Return procedure for SI88240EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88240EC-ISR Tags
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