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Skyworks Solutions Inc. SI88441EC-ASR
- Part No.:
- SI88441EC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88441EC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:1,461
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Product details
Overview
SI88441EC-ASR 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 max propagation delay, and provides 5000 VRMS reinforced isolation. It is used in traction inverters and battery management systems requiring galvanic separation and local isolated power.
For engineers reviewing the SI88441EC-ASR datasheet, SI88441EC-ASR pinout, SI88441EC-ASR application, or SI88441EC-ASR equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all aligned to Skyworks' Si884xx family specifications and automotive-grade design requirements.
Technical Context
The SI88441EC-ASR implements four unidirectional RF-based digital isolation channels across a silicon dioxide capacitive barrier, using on/off keying modulation for superior noise immunity and magnetic field rejection. Its isolated DC-DC converter uses an external flyback transformer, NMOS switch driver (ESW), and current-sense input (RSN) to support high-input-voltage operation (≤24 V).
This variant belongs to the Si884xx series optimized for high-voltage-to-low-voltage or high-voltage-to-high-voltage conversion. It features fixed 250 kHz default switching frequency, no shutdown (SH) or soft-start (SS) pins, and requires Type 1 loop compensation at COMP with RCOMP = 100 kΩ - distinguishing it from Si882xx/3xx and Si886xx variants.
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 - enables high-speed serial interfaces like SPI, RS-485, and CAN FD physical layer isolation |
| Propagation Delay | ≤23 ns max - ensures tight timing control in motor gate drivers and real-time feedback loops |
| DC-DC Output Power | Up to 5 W peak - powers secondary-side microcontrollers, ADCs, and gate drivers without external DC-DC stage |
| Operating Temp | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient conditions |
| Transient Immunity | 100 kV/µs typical - sustains operation during fast-switching EMI events in inverters and SMPS |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev G - meets automotive reliability and stress-test requirements |
Pinout & Package
SI88441EC-ASR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 1.27 mm pitch), rated for 5000 VRMS isolation and optimized for high-voltage PCB layout with creepage/clearance compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 9, 10 | HF XMTR / HF RCVR | Four bidirectional-capable RF transmitter/receiver pairs - each pair supports one unidirectional isolation channel (A1→B1, A2→B2, etc.) |
| 7, 8, 14, 13 | A1–A4 | Primary-side digital input signals - connect to MCU GPIO, UART TX, or PWM controller outputs |
| 11, 12, 16, 15 | B1–B4 | Secondary-side digital output signals - drive isolated gate drivers, ADC inputs, or communication transceivers |
| 17, 18 | GNDP, GNDA | Primary-side power and signal ground - must be shorted with minimal trace length per layout guidelines |
| 19, 20 | GNDB, VDDB | Secondary-side signal ground and supply - powers isolated logic; VDDB sourced from internal DC-DC or external regulator |
| VDDA (Pin 17) | Digital isolator primary supply | Accepts 3.0–5.5 V only - requires external regulation if primary rail exceeds 5.5 V; VREGA supports this via NPN bias circuit |
| ESW (Pin 3) | External switch driver | Drives external NMOS FET in high-voltage flyback topology - enables >5.5 V primary-side operation (e.g., 24 V input) |
| RSN (Pin 2) | Current sense input | Monitors primary-side switch current via shunt resistor - essential for peak-current-mode control and overcurrent protection |
| VSNS (Pin 12) | DC-DC feedback input | Connects to resistor divider on secondary side - enables precise regulation of isolated output voltage without optocouplers |
| COMP (Pin 11) | Loop compensation | Requires 100 kΩ resistor + capacitor network - sets crossover frequency for stable closed-loop DC-DC regulation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated flyback DC-DC controller | Eliminates need for separate isolated power IC - reduces BOM count and board area in space-constrained inverters |
| RF-based isolation architecture | Delivers 100 kV/µs CMTI and sub-23 ns propagation delay - critical for IGBT/SiC gate driver timing integrity |
| Secondary-side voltage sensing | Enables ±1% load/line regulation without optocoupler drift - improves long-term accuracy in battery monitoring systems |
| AEC-Q100 qualified | Validated for automotive applications including traction inverters and BMS - supports PPAP documentation and IMDS reporting |
| SOIC-20 wide-body package | Provides 8.3 mm creepage distance - meets reinforced insulation requirements for 1000 VRMS working voltage systems |
Applications
| Traction Inverter Control | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Isolating gate driver signals and feedback from high-voltage DC bus (400–800 V) to low-voltage MCU domain in EV/HEV inverters. IC Role / Device Role / Timing Role: SI88441EC-ASR provides four isolated logic channels plus regulated 5 V supply for isolated gate drivers and current sensors. Use Value: Enables single-package isolation + power, reducing component count and improving timing synchronization between phase legs. |
Use Scenario: Monitoring cell voltages and temperatures across 96+ series-connected Li-ion cells with centralized MCU. IC Role / Device Role / Timing Role: SI88441EC-ASR isolates analog front-end SPI buses and supplies isolated 3.3 V to daisy-chained ADCs. Use Value: Delivers precise, low-noise isolated power and signal paths - avoids ground loop errors and improves SOC estimation accuracy. |
| Industrial PLC Analog I/O Module | Isolated Switch-Mode Power Supply Feedback |
|
Use Scenario: Digitally isolating 4–20 mA current loop inputs and outputs in modular PLC backplanes operating at 24 V DC. IC Role / Device Role / Timing Role: SI88441EC-ASR handles bidirectional digital isolation for configuration and status, while powering isolated ADC/DAC stages. Use Value: Integrates signal and power isolation into one SOIC-20 footprint - simplifies thermal design and eases CE/UL certification. |
Use Scenario: Providing isolated feedback and auxiliary power for 1–3 kW telecom/server SMPS with 48 V or 54 V input. IC Role / Device Role / Timing Role: SI88441EC-ASR senses secondary-side output voltage (VSNS), regulates via COMP, and powers opto-coupler replacement circuitry. Use Value: Replaces optocoupler + LDO combo with higher accuracy, longer lifetime, and better temperature stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad digital isolator with integrated DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88440EC-ASR | No failsafe mode; default output state undefined on input loss | Suitable for non-safety-critical control where output state during fault is not mandated | Select when failsafe behavior is unnecessary and cost optimization is prioritized |
| SI88442EC-ASR | Includes failsafe mode (outputs go low on input loss); same pinout and DC-DC specs | Required in safety-critical subsystems where defined output state prevents hazardous conditions | Choose for ISO 26262 ASIL-B compliant designs needing guaranteed low-state fail behavior |
Compared with SI88440EC-ASR and SI88442EC-ASR, the SI88441EC-ASR offers a balanced middle option: it lacks failsafe but retains full DC-DC functionality and timing performance - ideal for cost-sensitive automotive subsystems where functional safety is managed at system level rather than component level.
Availability
SI88441EC-ASR is available at Aetrix Electronics and suitable for traction inverters, battery management systems, industrial PLCs, and isolated SMPS requiring stable component supply, automotive-grade qualification, and integrated signal + power isolation.
Supply support for SI88441EC-ASR 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 Si88xx product line was developed to replace optocouplers and discrete isolation + DC-DC combinations in high-reliability automotive and industrial systems - emphasizing integration, regulatory compliance, and robustness under EMI and thermal stress.
FAQ
What is the maximum isolated output power supported by SI88441EC-ASR?
The SI88441EC-ASR supports up to 5 W peak isolated output power when used with an appropriately rated external transformer and MOSFET. This capability enables direct powering of secondary-side microcontrollers, gate drivers, and sensor interfaces without additional DC-DC converters - a key advantage in compact inverter and BMS designs where board space is constrained.
Does SI88441EC-ASR include a shutdown pin for the DC-DC converter?
No, SI88441EC-ASR does not include a shutdown (SH) pin. Unlike Si882xx/3xx variants, the Si884xx family - including SI88441EC-ASR - omits the SH function. The DC-DC converter operates whenever valid input voltage is applied to VDDA and VDDP. This reflects its target use in always-on automotive subsystems where continuous isolated power is required.
What is the purpose of the RSN pin on SI88441EC-ASR?
The RSN (current sense) pin on SI88441EC-ASR connects to a shunt resistor on the primary-side switch path. It enables peak-current-mode control of the external flyback converter, providing cycle-by-cycle current limiting and accurate regulation under varying load and input conditions - essential for reliable operation in 24 V input automotive and industrial power systems.
Can SI88441EC-ASR be used with 24 V input to generate 24 V isolated output?
Yes, SI88441EC-ASR supports 24 V to 24 V isolated conversion using the high-voltage flyback topology. It requires an external NMOS switch driven by ESW, current sensing via RSN, and appropriate transformer selection (e.g., Mentech TTER09-0458S1). The VSNS feedback network and COMP compensation must be configured per AN901 for stable 24 V regulation.
What is the recommended compensation network for the COMP pin on SI88441EC-ASR?
SI88441EC-ASR requires a Type 1 compensation network at the COMP pin with RCOMP = 100 kΩ (fixed internal match) and CCOMP calculated per the equation CCOMP = 1/(2π × fC × RCOMP). For typical 20 kHz crossover frequency, CCOMP ≈ 80 nF. This network stabilizes the DC-DC control loop and is mandatory for reliable regulation across temperature and load variations.
SI88441EC-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si88x4x
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SI88441EC-ASR FAQ
1.How can I place an order for SI88441EC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88441EC-ASR 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-ASR reliable?
The price and inventory of SI88441EC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88441EC-ASR is usually 5 days.
3.What payment methods are accepted for SI88441EC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88441EC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88441EC-ASR?
SI88441EC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88441EC-ASR 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-ASR?
For technical support, including SI88441EC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88441EC-ASR requirements.
6.How does Aetrix verify that SI88441EC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88441EC-ASR 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-ASR meets industry standards.
7.What is the process for return or replacement of SI88441EC-ASR?
All SI88441EC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88441EC-ASR, 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-ASR part is unused and in its original packaging.
Return procedure for SI88441EC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88441EC-ASR Tags
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