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Skyworks Solutions Inc. SI88444EC-ASR
- Part No.:
- SI88444EC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88444EC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:4,651
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Product details
Overview
SI88444EC-ASR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, designed for high-voltage-to-low-voltage or high-voltage-to-high-voltage conversion (e.g., 24 V input to 5 V or 24 V output). It delivers up to 5 W peak isolated power, supports 100 Mbps data rate, 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-ASR datasheet, SI88444EC-ASR pinout, SI88444EC-ASR application, or SI88444EC-ASR equivalent, this page delivers verified technical context, package mapping, functional pin roles, real-world use cases, and validated alternative options - all confirmed against Skyworks' official Si88x4x family documentation dated August 2023.
Technical Context
The SI88444EC-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 integrated flyback DC-DC controller operates with external NMOS switch (driven by ESW), current sense (RSN), and secondary-side feedback (VSNS/COMP).
This device belongs to the Si884xx subfamily optimized for high-voltage primary-side operation (up to 24 V), requiring external power switch and shunt resistor. It features fixed 250 kHz default switching frequency, no shutdown (SH) or soft-start (SS) pins, and uses 100 kΩ compensation resistance at COMP for loop stability.
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 communication in motor control and BMS interfaces |
| Propagation Delay | ≤23 ns max - supports tight timing budgets in real-time control loops |
| DC-DC Output Power | Up to 5 W peak - powers isolated logic and peripheral ICs without external regulators |
| Operating Temp | –40 °C to +125 °C - qualified for automotive under-hood and industrial harsh environments |
| Transient Immunity | 100 kV/µs typical - ensures robust operation during fast-switching EMI events in inverters |
| AEC-Q100 Grade | Qualified - meets automotive reliability requirements for HEV/EV applications |
Pinout & Package
SI88444EC-ASR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 15.4 mm, 1.27 mm pitch) with creepage/clearance ≥8.3 mm for reinforced isolation.
| 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 for digital channel A1–A4 and B1–B4 |
| 7, 8 | A1, A2 | Primary-side digital input/output signals (channel 1 and 2) |
| 11, 12 | B1, B2 | Secondary-side digital input/output signals (channel 1 and 2) |
| 13, 14 | A3, A4 | Primary-side digital input/output signals (channel 3 and 4) |
| 15, 16 | B3, B4 | Secondary-side digital input/output signals (channel 3 and 4) |
| 17 | GNDP | Primary-side power stage ground - must be short-traced to VDDP |
| 18 | RSN | Current sense input for external FET - sets peak current limit in flyback controller |
| 19 | ESW | External switch driver output - drives gate of external NMOS transistor (Q1) |
| 20 | VDDA | Primary-side signal supply (≤5.5 V) - powers isolator logic and controller core |
Key Features
| Feature | Design Value |
|---|---|
| Flyback DC-DC with external switch | Enables 24 V primary-side operation while maintaining high efficiency and thermal safety |
| Secondary-side voltage sensing | Eliminates optocouplers and external bias circuitry - improves load regulation and long-term reliability |
| 100 kΩ COMP pin resistance | Matches internal compensation network for stable loop response with external RCOMP/CCOMP |
| RF on/off keying isolation | Provides best-in-class CMTI (100 kV/µs) and immunity to magnetic fields in noisy power electronics |
| AEC-Q100 qualification | Validated for automotive-grade production use in traction inverters and battery monitoring units |
Applications
| Traction Inverter Control | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Isolating gate drive signals and ADC feedback between MCU and IGBT/SiC modules in EV powertrain inverters. IC Role / Device Role / Timing Role: Provides reinforced isolation for PWM signals and current/voltage sensing data across 24 V primary bus. Use Value: Enables safe 24 V-to-5 V conversion to power isolated gate drivers and ADCs while maintaining ≤23 ns timing alignment. |
Use Scenario: Monitoring cell voltages and temperatures across 96-cell battery packs with distributed sensing nodes. IC Role / Device Role / Timing Role: Transfers isolated analog front-end data and control commands across high-potential barriers in modular BMS stacks. Use Value: Delivers 5 W isolated power to remote sensor nodes and supports 100 Mbps daisy-chain communication without external DC-DC stages. |
| Industrial PLC Analog I/O Module | Isolated Switch-Mode Power Supply Feedback |
|
Use Scenario: Conditioning and isolating 4–20 mA or ±10 V analog inputs in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Digitally isolates sigma-delta ADC outputs and supplies isolated 5 V to precision op-amps and reference buffers. Use Value: Replaces discrete optocoupler + regulator combinations, reducing board area and improving temperature drift performance. |
Use Scenario: Providing isolated feedback path and auxiliary power for secondary-side controllers in medical-grade SMPS. IC Role / Device Role / Timing Role: Senses regulated output voltage via VSNS and powers secondary-side supervisor ICs using VDDB rail. Use Value: Achieves <1% load regulation and eliminates optocoupler aging effects - critical for Class II/III medical compliance. |
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-ASR | No failsafe mode; identical pinout, SOIC-20, 24 V input support, same ESW/RSN/VSNS interface | Lacks configurable failsafe output state on loss of input power - unsuitable for safety-critical shutdown sequences | Select SI88440EC-ASR only when failsafe behavior is not required and cost optimization is prioritized |
| SI88644EC-ASR | Includes SH_FC and SS pins for frequency control and soft-start; uses SOIC-24 package; same 24 V input capability | Supports programmable 200–800 kHz switching and controlled inrush - preferred for EMI-sensitive designs | Choose SI88644EC-ASR when adjustable frequency or soft-start is needed; requires PCB layout change due to SOIC-24 footprint |
Compared with SI88444EC-ASR, SI88440EC-ASR removes failsafe logic to reduce cost but retains identical isolation and power specs, while SI88644EC-ASR adds configurability at the expense of larger package and layout revision - making SI88444EC-ASR the optimal balance of integration, reliability, and drop-in compatibility for fixed-frequency 24 V systems.
Availability
SI88444EC-ASR is available at Aetrix Electronics and suitable for traction inverter control, battery management systems, and industrial PLC analog I/O modules requiring stable component supply, automotive-grade traceability, and long-lifecycle support.
Supply support for SI88444EC-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 SI88444EC-ASR belongs to Skyworks' Si88x4x quad digital isolator family, engineered specifically for high-voltage industrial and automotive power systems requiring integrated isolated power and robust signal integrity.
FAQ
What is the primary-side voltage range supported by SI88444EC-ASR?
The SI88444EC-ASR is designed for high-voltage primary-side operation, supporting input voltages up to 24 V. It requires an external NMOS switch driven by the ESW pin and current sensing via RSN. Its VDDA supply must remain ≤5.5 V, and if no suitable local rail exists, the VREGA reference can bias an external NPN transistor to generate VDDA - as documented in Skyworks AN901.
Does SI88444EC-ASR include shutdown or soft-start functionality?
No. Unlike Si883xx or Si886xx variants, SI88444EC-ASR does not feature SH, SH_FC, or SS pins. Section 2.3.1 of the datasheet explicitly states shutdown is "not available on the Si884xx", and Section 2.3.2 confirms soft-start is only offered on Si883xx and Si886xx. SI88444EC-ASR relies on fixed 250 kHz operation and inherent cycle-skipping for light-load efficiency.
What transformer is recommended for SI88444EC-ASR in a 24 V to 5 V design?
Skyworks validates the UMEC UTB02250s and Coilcraft TA7788-AL transformers for 24 V input to 5 V output with SI88444EC-ASR. Both meet 5 kVRMS isolation, ≤600 nH leakage inductance, and 25 µH ±5% primary inductance. The UTB02250s supports 7–24 V input and 3.3–5.5 V output with 3.0:1 turns ratio - matching SI88444EC-ASR's high-voltage configuration requirements.
How is loop compensation implemented on SI88444EC-ASR?
SI88444EC-ASR uses Type 1 compensation at the COMP pin with a fixed internal 100 kΩ resistance. Designers must add an external series RC network (RCOMP = 100 kΩ, CCOMP calculated per AN901) from COMP to GNDB. This matches the internal compensation architecture and ensures stable flyback regulation - differing from Si882xx/3xx which use 49.9 kΩ.
Is SI88444EC-ASR pin-compatible with other Si88x4x variants?
SI88444EC-ASR shares the SOIC-20 package and pinout with SI88440EC-ASR and SI88442EC-ASR (Figure 3), including identical placement of ESW, RSN, VSNS, COMP, VDDA, and all isolation channel pins. However, it is not pin-compatible with Si882xx (SOIC-20 with SH/VSW), Si883xx (SOIC-24 with SH_FC/SS), or Si886xx (SOIC-24) - confirmed by Skyworks' pin configuration diagrams and Table 1.
SI88444EC-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:
- 0/4
- 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
SI88444EC-ASR FAQ
1.How can I place an order for SI88444EC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88444EC-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 SI88444EC-ASR reliable?
The price and inventory of SI88444EC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88444EC-ASR is usually 5 days.
3.What payment methods are accepted for SI88444EC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88444EC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88444EC-ASR?
SI88444EC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88444EC-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 SI88444EC-ASR?
For technical support, including SI88444EC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88444EC-ASR requirements.
6.How does Aetrix verify that SI88444EC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88444EC-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 SI88444EC-ASR meets industry standards.
7.What is the process for return or replacement of SI88444EC-ASR?
All SI88444EC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88444EC-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 SI88444EC-ASR part is unused and in its original packaging.
Return procedure for SI88444EC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88444EC-ASR Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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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
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ISO7741FDWR
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