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Skyworks Solutions Inc. SI88442EC-ISR
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- Part No.:
- SI88442EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88442EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,109
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Product details
Overview
SI88442EC-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, delivering up to 5 W output power at 5 V, supporting data rates up to 100 Mbps, propagation delay ≤23 ns, and reinforced isolation rated to 5000 VRMS. It serves as a complete signal + power isolation solution in high-voltage industrial inverters and battery management systems.
For engineers reviewing the SI88442EC-ISR datasheet, SI88442EC-ISR pinout, SI88442EC-ISR application, or SI88442EC-ISR equivalent, this page provides verified functional specifications, SOIC-20W package mapping, transformer-coupled flyback DC-DC architecture details, and validated alternative options for high-voltage input (≤24 V) to isolated low-voltage output designs.
Technical Context
The SI88442EC-ISR implements four unidirectional CMOS isolation channels using RF on-off keying across a silicon dioxide capacitive barrier, enabling robust noise immunity and no-startup initialization. Its isolated DC-DC converter uses an external NMOS switch driven by ESW, current sensing via RSN, and secondary-side voltage feedback through VSNS-enabling precise regulation without optocouplers.
This device belongs to the Si884xx family optimized for high-voltage primary-side inputs (up to 24 V), requiring external power switch and sense resistor. It features fixed 250 kHz PWM frequency, no SH/SH_FC shutdown pin, no SS soft-start pin, and 100 kΩ internal compensation resistance at COMP for stable loop control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - meets UL 1577, CSA 62368-1, VDE 62368-1 reinforced insulation requirements |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces including SPI, RS-485, and digital I/O in motor drives |
| Propagation Delay | ≤23 ns max - enables tight timing control in real-time control loops and gate driver feedback paths |
| DC-DC Output Power | Up to 5 W peak - powers isolated side logic (VDDB) and external circuitry (e.g., gate drivers, ADCs) simultaneously |
| Input Voltage Range | Up to 24 V on primary side - requires external NMOS switch (ESW driver) and current sense resistor (RSN) |
| Compensation Resistance | 100 kΩ internal - sets Type 1 loop compensation with external CCOMP at COMP pin for stable flyback operation |
| Operating Temperature | –40 °C to +125 °C - qualified per AEC-Q100 for automotive traction inverter and BMS use |
Pinout & Package
SI88442EC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 1.27 mm pitch), optimized for creepage/clearance compliance in 5000 VRMS applications.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 9, 10 | HF XMTR / HF RCVR | Four bidirectional-capable RF transmitter/receiver pairs for digital channel A1–A4 and B1–B4 across isolation barrier |
| 7, 8 | A1, A2 | Primary-side digital input/output channels - referenced to VDDA/GNDA; support 0–100 Mbps CMOS signaling |
| 11, 12, 14, 13 | B1, B2, B3, B4 | Secondary-side digital input/output channels - referenced to VDDB/GNDB; galvanically isolated from primary side |
| 15 | GNDP | Primary-side power stage ground - must be shorted directly to GNDA with ≥15-mil trace per layout guidelines |
| 16 | RSN | Current sense input for external NMOS switch - enables peak-current-mode control of flyback converter |
| 17 | ESW | External switch driver output - drives gate of external NMOS transistor (Q1) in high-voltage flyback configuration |
| 18 | VDDA | Primary-side signal supply - must be ≤5.5 V; powered externally or via VREGA + NPN regulator if >5.5 V available |
| 19 | GNDA | Primary-side signal ground - separate from GNDP but directly connected with minimal impedance |
| 20 | VREGA | Internal voltage reference - used with external NPN transistor to generate regulated VDDA when primary supply >5.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated flyback DC-DC controller | Eliminates need for optocoupler-based feedback - senses output voltage on secondary side (VSNS) and transmits error across isolation barrier |
| RF-based digital isolation | On-off keying modulation delivers best-in-class 100 kV/µs transient immunity and immunity to magnetic fields vs. pulse-based schemes |
| External NMOS switch support | ESW pin drives high-side NMOS; RSN pin enables accurate current sensing - required for >5.5 V primary-side operation |
| Thermal protection | Automatic shutdown at safe junction temperature - prevents permanent damage during overload or poor heatsinking |
| Cycle skipping at light load | Reduces switching losses automatically below ~20% load - improves efficiency in standby or low-power modes |
Applications
| Industrial Inverters | Battery Management Systems |
|---|---|
Use Scenario: Isolated gate drive and current sensing in 3-phase motor inverters with 600–1200 V DC bus. IC Role / Device Role / Timing Role: Provides simultaneous isolated power (5 V @ 1 A) and four high-speed digital channels for PWM signals and fault reporting. Use Value: Enables single-chip isolation of both power and signal domains - reduces component count vs. discrete isolator + DC-DC combo. |
Use Scenario: Cell monitoring and balancing in EV battery packs with 24 V system supply and isolated MCU communication. IC Role / Device Role / Timing Role: Delivers isolated 5 V power to analog front-end ICs while transmitting cell voltage data and thermal alerts across barrier. Use Value: Meets AEC-Q100 and 5000 VRMS requirements - eliminates need for separate safety-certified power and signal isolation stages. |
| Traction Inverters | PLC Digital I/O Modules |
Use Scenario: High-reliability isolation in hybrid/electric vehicle traction inverters operating at ambient up to 105 °C. IC Role / Device Role / Timing Role: Supplies isolated gate driver power and transmits PWM enable/fault signals with <23 ns delay for fast overcurrent response. Use Value: Supports –40 °C to +125 °C operation with automotive-grade PPAP documentation - simplifies qualification for ASIL-B systems. |
Use Scenario: Isolated digital input/output expansion in industrial PLC backplanes with 24 V field-side supply. IC Role / Device Role / Timing Role: Converts 24 V primary-side supply into isolated 5 V for downstream logic, while relaying status/control bits across barrier. Use Value: Eliminates external DC-DC converter and four discrete isolators - reduces PCB area by >40% and bill-of-materials cost. |
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 |
|---|---|---|---|
| SI88440EC-ISR | No failsafe mode; default output state undefined on input loss - SI88442EC-ISR defaults high on all channels. | Suitable for non-safety-critical monitoring; not recommended where defined state on failure is required. | Select SI88442EC-ISR when fail-safe behavior (high default) is needed for gate driver enable or fault flag transmission. |
| ADUM6420ARWZ | Analog Devices part with integrated DC-DC; lower 2 W max output power, 50 Mbps max data rate, SOIC-20W package. | Limited to lower-power isolated logic; insufficient for driving gate drivers or powering multiple downstream ICs. | Choose SI88442EC-ISR when ≥5 W isolated power and 100 Mbps throughput are required in same footprint. |
Compared with SI88440EC-ISR, SI88442EC-ISR adds failsafe high-default channel behavior critical for safety interlocks; compared with ADUM6420ARWZ, it doubles output power and data rate while maintaining pin compatibility - enabling direct upgrade in space-constrained high-power isolation designs.
Availability
SI88442EC-ISR is available at Aetrix Electronics and suitable for industrial inverters, battery management systems, and traction inverter designs requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for SI88442EC-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 specifically for high-reliability industrial and automotive applications requiring combined signal and power isolation - eliminating optocouplers and discrete DC-DC converters in safety-critical systems.
FAQ
What is the maximum isolated output power supported by the SI88442EC-ISR?
The SI88442EC-ISR supports up to 5 W peak isolated output power at 5 V, achieved using an external NMOS switch driven by the ESW pin and current sensing via RSN. This power level is sufficient to supply isolated gate drivers, ADCs, and microcontrollers in industrial and automotive systems without additional DC-DC stages. The SI88442EC-ISR achieves this while maintaining 5000 VRMS isolation and AEC-Q100 qualification.
Does the SI88442EC-ISR include a shutdown pin for the DC-DC converter?
No, the SI88442EC-ISR does not include a shutdown (SH) pin - this feature is absent in all Si884xx devices per the datasheet. Unlike Si882xx/3xx variants, SI88442EC-ISR relies on primary-side supply removal or external control of the ESW-driven NMOS switch to disable DC-DC operation. This design reflects its target use in high-voltage systems where continuous regulation is preferred over dynamic shutdown.
Which transformer part numbers are validated for use with the SI88442EC-ISR?
Validated transformers for SI88442EC-ISR include UMEC UTB02250s (7–24 V input to 3.3–5.5 V output, 5 kVRMS), Coilcraft TA7788-AL (12 V input to 5/15 V output), and Mentech TTER09-0458S1 (8–24 V input to 8–24 V output). These are specified in Skyworks AN901 and support the external-switch flyback topology required by SI88442EC-ISR's 24 V primary-side operation.
What is the purpose of the RSN and ESW pins on the SI88442EC-ISR?
The RSN (current sense) and ESW (external switch driver) pins enable SI88442EC-ISR's high-voltage flyback operation: ESW drives the gate of an external NMOS transistor, while RSN monitors switch current to implement peak-current-mode control. Together, they replace internal power switches - allowing SI88442EC-ISR to safely operate with primary-side voltages up to 24 V, unlike low-voltage Si882xx/3xx variants.
How does the SI88442EC-ISR achieve voltage regulation without optocouplers?
The SI88442EC-ISR senses output voltage on the secondary side using a resistor divider into the VSNS pin, encodes the error, and transmits it across the isolation barrier to the primary-side controller via an internal feedback path. This closed-loop method eliminates optocouplers and their associated biasing complexity, delivering superior line/load regulation and longer lifetime reliability - a core advantage confirmed in Skyworks AN901.
SI88442EC-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:
- 2/2
- 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
SI88442EC-ISR FAQ
1.How can I place an order for SI88442EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88442EC-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 SI88442EC-ISR reliable?
The price and inventory of SI88442EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88442EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88442EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88442EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88442EC-ISR?
SI88442EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88442EC-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 SI88442EC-ISR?
For technical support, including SI88442EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88442EC-ISR requirements.
6.How does Aetrix verify that SI88442EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88442EC-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 SI88442EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88442EC-ISR?
All SI88442EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88442EC-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 SI88442EC-ISR part is unused and in its original packaging.
Return procedure for SI88442EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88442EC-ISR Tags
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