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Skyworks Solutions Inc. SI88644EC-ISR
- Part No.:
- SI88644EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88644EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,833
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Product details
Overview
SI88644EC-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, rated for 5 kVRMS isolation, supporting up to 100 Mbps data rate and 23 ns max propagation delay. It features external switch driver (ESW), current sense (RSN), programmable soft-start (SS), and shutdown/frequency control (SH_FC) pins, designed for high-voltage input (up to 24 V) to isolated 3.3/5.0 V or 24 V output in industrial motor control and battery management systems.
For engineers reviewing the SI88644EC-ISR datasheet, SI88644EC-ISR pinout, SI88644EC-ISR application, or SI88644EC-ISR equivalent, this device delivers verified reinforced insulation (UL 1577, VDE 62368-1), AEC-Q100 qualification, –40 to +125 °C operation, and flyback-based dc-dc conversion with external FET support - critical for traction inverter gate drive and isolated PLC I/O design.
Technical Context
The SI88644EC-ISR 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 dc-dc controller operates in peak current mode with secondary-side voltage sensing via VSNS, eliminating optocouplers and enabling precise line/load regulation.
This variant belongs to the Si886xx family optimized for high-voltage primary-side operation (up to 24 V), requiring external NMOS switch (driven by ESW), shunt-based current sensing (RSN), and external compensation (COMP). It supports programmable switching frequency (200–800 kHz) and soft-start timing via RC networks on SH_FC and SS pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for one minute - meets reinforced insulation requirements per UL 1577 and VDE 62368-1. |
| Data Rate | Up to 100 Mbps - enables high-speed serial communication in real-time motor control and EV BMS interfaces. |
| Propagation Delay | 23 ns maximum - ensures tight timing alignment across isolated domains in gate driver feedback loops. |
| DC-DC Output Power | Up to 5 W peak with external power switch - sufficient to power isolated microcontrollers, ADCs, and gate drivers. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient environments. |
| Transient Immunity | 100 kV/µs typical - provides robust operation in noisy inverter and motor drive applications. |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev G - validated for automotive-grade reliability and defectivity control. |
Pinout & Package
SI88644EC-ISR is housed in a RoHS-compliant SOIC-24 wide-body package (15.4 mm × 7.5 mm, 1.27 mm pitch), optimized for creepage/clearance compliance at 5 kVRMS. Pin functions are validated per Figure 4 and Table 1 of Skyworks datasheet 206332B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA | Digital isolator primary-side supply | Accepts 3.0–5.5 V; powers internal logic and RF transmitter on A-side. |
| GNDA | Primary-side signal ground | Reference for A1–A4 inputs and VDDA; must be shorted directly to GNDP per layout guidelines. |
| A1–A4 | Primary-side digital input channels | Unidirectional CMOS inputs; each pairs with corresponding B1–B4 on isolated side. |
| VDDP | DC-DC primary-side power supply | Accepts up to 24 V input; powers internal controller and ESW driver stage. |
| GNDP | DC-DC primary-side ground | Power return for VDDP and ESW; requires low-inductance connection to GNDA. |
| ESW | External switch driver output | Drives gate of external NMOS FET (Q1); enables high-voltage flyback topology. |
| RSN | Current sense input | Monitors primary-side current via shunt resistor; enables cycle-by-cycle overcurrent protection. |
| SH_FC | Shutdown and frequency control | High-level assertion disables dc-dc; RC network sets PWM frequency (200–800 kHz). |
| SS | Soft-start timing control | Capacitor-connected pin programs startup ramp time to limit inrush current. |
| VREGA | Primary-side voltage reference | Internal Zener reference (2.5 V) used with external NPN to generate VDDA if no local supply exists. |
| VSNS | DC-DC feedback input | Connects to resistor divider on secondary side; enables closed-loop regulation without optocoupler. |
| COMP | Compensation node | External R-C network (RCOMP = 100 kΩ, CCOMP calculated per crossover freq.) stabilizes control loop. |
| VDDB | Secondary-side digital supply | Output of isolated dc-dc (3.3/5.0/24 V); powers B1–B4 receivers and downstream isolated circuitry. |
| GNDB | Secondary-side signal ground | Reference for B1–B4 outputs and VDDB; galvanically isolated from GNDA/GNDP. |
| B1–B4 | Secondary-side digital output channels | Unidirectional CMOS outputs; each corresponds to A1–A4 with 23 ns max prop delay. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based digital isolation | On/off keying modulation provides >100 kV/µs transient immunity and immunity to magnetic fields - critical for inverter gate drive integrity. |
| Secondary-sensing dc-dc control | VSNS feedback eliminates optocoupler dependency, improving long-term stability and reducing BOM count in isolated power supplies. |
| External FET support (ESW + RSN) | Enables safe operation with 24 V primary input and scalable output power up to 5 W - suitable for high-side gate driver biasing. |
| Programmable soft-start & frequency | SS and SH_FC pins allow tuning of inrush current and EMI profile - essential for meeting CISPR-25 Class 5 in automotive designs. |
| Reinforced insulation certification | UL 1577 (5 kVRMS), VDE 62368-1, CSA 62368-1, and CQC GB4943.1 - enables single-component isolation in safety-critical systems. |
| AEC-Q100 qualification | Validated for automotive use with AIAG PPAP support and IMDS/CAMDS compliance - reduces qualification effort for EV traction inverters. |
Applications
| Motor Control Gate Drive | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Isolating PWM signals and fault feedback between MCU and high-voltage IGBT/SiC gate drivers in 3-phase inverters. IC Role / Device Role / Timing Role: Quad-channel isolator transmits gate enable/disable and desaturation fault signals across 5 kVRMS barrier with <23 ns skew. Use Value: Enables compact, certified isolation without external optocouplers or LDOs - reduces PCB area and improves system-level ASIL-B compliance. |
Use Scenario: Communicating cell voltage and temperature measurements from high-voltage battery stack to MCU in EVs. IC Role / Device Role / Timing Role: Provides isolated 5 V power and four bidirectional data paths for daisy-chained monitoring ICs. Use Value: Eliminates need for separate isolated DC-DC and digital isolators - simplifies BOM and meets AEC-Q100 thermal and lifetime requirements. |
| Industrial PLC I/O Module | Traction Inverter Control |
|
Use Scenario: Isolating digital inputs/outputs in distributed I/O terminals interfacing with 24 V field devices. IC Role / Device Role / Timing Role: Delivers isolated 24 V output power and four independent signal channels for status reporting and command execution. Use Value: Supports direct 24 V-to-24 V conversion with external FET, enabling single-chip isolation for both power and data in DIN-rail modules. |
Use Scenario: Providing isolated gate drive power and feedback for dual-motor traction inverters in hybrid electric vehicles. IC Role / Device Role / Timing Role: Supplies regulated 15 V gate bias to isolated half-bridge drivers while transmitting phase current and temperature telemetry. Use Value: Meets reinforced insulation and –40 to +125 °C operation required for ISO 26262 ASIL-D subsystems without derating. |
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 |
|---|---|---|---|
| SI88642EC-ISR | Same SOIC-24 package and pinout; differs only in failsafe default state (SI88642 defaults to high-Z on B-side during fault, SI88644 defaults to logic high). | Preferred where fail-safe output state must assert active-high control (e.g., enable lines for gate drivers). | Select SI88644EC-ISR when logic-high default on isolated outputs is required during power-up or fault conditions. |
| ADUM6420ARWZ | 4-channel isolator with integrated 500 mW dc-dc; lower output power, no external FET support, fixed 250 kHz frequency, no programmable soft-start. | Suitable for low-power MCU interfaces but insufficient for driving gate drivers or powering isolated ADCs in high-noise environments. | Choose SI88644EC-ISR for applications demanding >2 W isolated power, 24 V input capability, and EMI-tunable frequency/soft-start. |
Compared with SI88642EC-ISR, SI88644EC-ISR offers identical isolation performance and power capability but guarantees logic-high failsafe output behavior - critical for safety-critical gate enable paths. Versus ADUM6420ARWZ, it delivers 10× higher isolated power and full programmability for automotive-grade EMI compliance.
Availability
SI88644EC-ISR is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management, and PLC I/O modules requiring stable component supply, long lifecycle support, and certified reinforced isolation.
Supply support for SI88644EC-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 developed to replace optocoupler-based isolation with robust, high-speed, integrated digital isolators featuring certified reinforced insulation and scalable isolated power - targeting automotive traction systems and industrial automation.
FAQ
What is the maximum isolated output power supported by SI88644EC-ISR?
The SI88644EC-ISR supports up to 5 W peak isolated output power when used with an external NMOS power switch driven by the ESW pin. This is achieved in high-voltage configurations (e.g., 24 V input to 5 V or 24 V output) and exceeds the 2 W average rating of internal-switch variants like the Si882xx series. The actual delivered power depends on transformer selection, layout, and thermal management.
Does SI88644EC-ISR require external components for DC-DC operation?
Yes, SI88644EC-ISR requires external components for dc-dc operation: an NMOS power switch (driven by ESW), current sense resistor (connected to RSN), transformer (e.g., UMEC UTB02250s or Coilcraft TA7788-AL), rectifying diode, output capacitor, and compensation network (RCOMP + CCOMP on COMP pin). Unlike Si882xx/3xx, it does not integrate primary-side power switches.
How is the switching frequency programmed on SI88644EC-ISR?
The switching frequency of SI88644EC-ISR is programmed via an external RC network connected between SH_FC and SS pins. The default frequency is 250 kHz, but users can set it within 200–800 kHz by selecting appropriate RFSW and CSS values per Skyworks AN901. This programmability enables EMI optimization in sensitive automotive and industrial environments.
What isolation certifications apply to SI88644EC-ISR?
SI88644EC-ISR is certified to UL 1577 (5000 VRMS, 1 min), VDE 62368-1 (reinforced insulation), CSA 62368-1, and CQC GB4943.1. These approvals validate its suitability for safety-critical applications including automotive traction inverters and industrial PLCs where reinforced insulation is mandated by IEC 61800-5-1 and ISO 26262.
Can SI88644EC-ISR operate with a 24 V input and deliver 24 V isolated output?
Yes, SI88644EC-ISR supports 24 V-to-24 V isolated conversion using the high-voltage configuration described in Figure 10 of the datasheet. It requires an external NMOS switch (Q1), current sense resistor (R4), transformer (e.g., Mentech TTER09-0458S1), and proper compensation. Output voltage is set by the VSNS resistor divider, and regulation occurs via secondary-side feedback.
SI88644EC-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 24-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:
- 24-SOIC
SI88644EC-ISR FAQ
1.How can I place an order for SI88644EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88644EC-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 SI88644EC-ISR reliable?
The price and inventory of SI88644EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88644EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88644EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88644EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88644EC-ISR?
SI88644EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88644EC-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 SI88644EC-ISR?
For technical support, including SI88644EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88644EC-ISR requirements.
6.How does Aetrix verify that SI88644EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88644EC-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 SI88644EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88644EC-ISR?
All SI88644EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88644EC-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 SI88644EC-ISR part is unused and in its original packaging.
Return procedure for SI88644EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88644EC-ISR Tags
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