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Skyworks Solutions Inc. SI88643EC-ISR
- Part No.:
- SI88643EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88643EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,028
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Product details
Overview
SI88643EC-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, supporting 100 Mbps data rate, 23 ns max propagation delay, and 5000 VRMS isolation. It features external switch driver (ESW), current sense (RSN), programmable soft-start (SS), and shutdown/frequency control (SH_FC) for high-voltage input (up to 24 V) to isolated 5 V output in industrial motor control and battery management systems.
For engineers reviewing the SI88643EC-ISR datasheet, SI88643EC-ISR pinout, SI88643EC-ISR application, or SI88643EC-ISR equivalent, this page delivers verified functional architecture, SOIC-24 wide-body package mapping, confirmed 4-channel unidirectional isolation, isolated 5 W power capability with external FET, and AEC-Q100 qualification for automotive-grade designs requiring reinforced insulation per VDE 62368-1 and UL 1577.
Technical Context
The SI88643EC-ISR implements RF-based on/off keying across a silicon dioxide capacitive barrier for each of its four unidirectional isolation channels, delivering sub-18 ns typical propagation delay and immunity to magnetic fields. Its isolated flyback DC-DC controller operates in peak current mode with secondary-side voltage sensing via VSNS and loop compensation at COMP.
This variant is configured for high-voltage primary-side operation (up to 24 V), using external NMOS switch driven by ESW and current sensing via RSN. It supports programmable switching frequency (200–800 kHz) and soft-start timing via external RC on SH_FC and SS pins, with thermal shutdown and cycle-skipping at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - meets reinforced insulation requirements per UL 1577 and VDE 62368-1. |
| Data Rate | Up to 100 Mbps - enables high-speed serial communication in motor gate drivers and PLC backplanes. |
| Propagation Delay | 23 ns maximum - ensures tight timing alignment in real-time control loops and encoder interfaces. |
| DC-DC Output Power | Up to 5 W with external power switch - powers isolated logic and auxiliary circuits without discrete DC-DC stages. |
| Operating Temp | –40 °C to +125 °C - supports under-hood automotive and industrial ambient conditions. |
| Transient Immunity | 100 kV/µs typical - maintains signal integrity during fast-switching IGBT/MOSFET commutation events. |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev G - validated for automotive electronics including traction inverters and BMS. |
Pinout & Package
SI88643EC-ISR is housed in a RoHS-compliant SOIC-24 wide-body package (15.4 mm × 7.5 mm, 1.27 mm pitch) with creepage/clearance optimized for 5000 VRMS isolation. Pin 1 marked with dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | VDDA, GNDA, RSN, ESW, VREGA, GNDP | Primary-side analog power and control: VDDA supplies isolator logic; RSN senses primary current; ESW drives external NMOS; VREGA references external bias for VDDA if >5.5 V available. |
| 7, 8, 17, 18 | SH_FC, SS, NC, NC | SH_FC enables shutdown and frequency programming; SS sets soft-start time constant; both require external RC for configuration. |
| 9–16 | A1–A4, B1–B4 | Four unidirectional CMOS I/O pairs: A-side inputs drive HF transmitters; B-side outputs decode HF receivers - no direction pins or auto-bidirectional logic. |
| 19–24 | VDDP, VSNS, COMP, DNC/VREGB, GNDB, VDDB | Secondary-side power and feedback: VDDB powers isolated logic; VSNS feeds resistor-divider feedback; COMP accepts R+C for Type 1 loop compensation; DNC/VREGB is Zener-referenced only if VOUT > 5.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation | Eliminates magnetic coupling sensitivity and startup initialization-enables plug-and-play integration in servo drives and inverters. |
| Secondary-sensing feedback | Enables precise line/load regulation without optocouplers or secondary-side biasing circuitry-reduces BOM count and improves long-term reliability. |
| External FET driver (ESW) | Supports primary-side voltages up to 24 V with external NMOS-avoids internal switch limitations while maintaining 5000 VRMS isolation barrier integrity. |
| Programmable soft-start & frequency | Reduces EMI via adjustable dithering and inrush limiting-critical for compliance in automotive EMC testing (CISPR 25 Class 5). |
| Integrated thermal shutdown | Protects against sustained overloads in enclosed enclosures-prevents latch-up or permanent damage during fault conditions in motor control applications. |
Applications
| Industrial Motor Control | Battery Management Systems |
|---|---|
Use Scenario: Isolating gate-drive signals and ADC feedback in 3-phase inverter stacks driving PMSM motors. IC Role / Device Role / Timing Role: Quad-channel isolator separates MCU PWM outputs (A1–A4) from IGBT/SiC gate drivers (B1–B4); DC-DC powers isolated gate-driver bias rails. Use Value: 23 ns max prop delay enables <100 ns dead-time control; 5000 VRMS withstand supports 600 V bus systems with safety margin. |
Use Scenario: Monitoring cell voltages and pack currents in EV battery packs with centralized master controller. IC Role / Device Role / Timing Role: Transmits isolated analog monitoring data and SOC commands across high-potential barriers; DC-DC powers isolated ADC and isolator side. Use Value: AEC-Q100 qualification ensures reliability over 15-year vehicle life; 100 kV/µs transient immunity prevents false trips during load dump events. |
| Traction Inverter Control | Programmable Logic Controllers |
Use Scenario: Interfacing MCU to high-side/lower-side gate drivers and current sensors in dual-motor traction inverters. IC Role / Device Role / Timing Role: Provides independent isolation for PWM, fault reporting, and temperature telemetry; DC-DC supplies isolated sensor front-end. Use Value: SOIC-24 wide-body package meets IPC-2221 creepage requirements for 1000 V working voltage; soft-start prevents inrush into large gate capacitances. |
Use Scenario: Isolating field I/O (digital inputs/outputs) and communication buses (RS-485, CAN) in distributed control cabinets. IC Role / Device Role / Timing Role: Replaces discrete optocouplers and isolated DC-DC modules; four channels handle DI/DO/COMMS simultaneously. Use Value: 5 W isolated power eliminates need for separate isolated supply-reducing board area by >30% vs. discrete solutions. |
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 |
|---|---|---|---|
| ADUM6420ARWZ | Integrated internal switches only (no ESW/RSN); max 2 W output; 2500 VRMS isolation. | Limited to ≤5.5 V primary input; unsuitable for 24 V input or >2 W isolated loads. | Choose ADUM6420ARWZ only when primary supply is ≤5.5 V and isolated power demand is ≤2 W. |
| ISO7844FDWER | No integrated DC-DC; requires external isolated supply; 8000 VRMS isolation; 100 Mbps. | Demands full external isolated power design (transformer, regulator, feedback); higher system complexity. | Choose ISO7844FDWER when highest isolation rating is mandatory and external DC-DC is already designed. |
Compared with ADUM6420ARWZ and ISO7844FDWER, SI88643EC-ISR uniquely combines 24 V primary support, 5 W external-FET power delivery, and 5000 VRMS in a single SOIC-24 package-making it optimal for space-constrained automotive and industrial systems needing both robust isolation and self-contained power.
Availability
SI88643EC-ISR is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, traction inverters, and programmable logic controllers requiring stable component supply, AEC-Q100 validation, and reinforced insulation certification.
Supply support for SI88643EC-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 family was designed to replace optocoupler-based isolation with integrated, high-efficiency isolated DC-DC for automotive and industrial systems demanding compact, reliable, and certified signal/power separation.
FAQ
What is the maximum input voltage supported by SI88643EC-ISR?
SI88643EC-ISR supports up to 24 V DC on the primary side via its external switch driver (ESW) and current sense (RSN) interface. It is specifically designed for high-voltage-to-isolated-low-voltage conversion (e.g., 24 V to 5 V), unlike low-voltage variants such as Si882xx/3xx which cap at 5.5 V. This makes SI88643EC-ISR suitable for industrial and automotive applications where bus voltages exceed 12 V.
Does SI88643EC-ISR require an external transformer?
Yes, SI88643EC-ISR requires an external miniature transformer for its isolated DC-DC function. The device integrates the controller and feedback circuitry but relies on external magnetics-such as UMEC UTB02250s or Coilcraft TA7788-AL-to complete the flyback topology. Transformer selection must match input/output voltage, turns ratio, leakage inductance, and isolation rating per AN901 design guidelines.
How many isolation channels does SI88643EC-ISR provide, and are they bidirectional?
SI88643EC-ISR provides four unidirectional digital isolation channels (A1→B1, A2→B2, A3→B3, A4→B4). Each channel uses RF on/off keying across a capacitive barrier and has no built-in direction control logic. Bidirectional communication requires pairing two channels (e.g., A1→B1 for TX, A2←B2 for RX), as the device does not support auto-direction sensing or half-duplex arbitration.
What certifications apply to SI88643EC-ISR?
SI88643EC-ISR is certified to UL 1577 (5000 VRMS), VDE 62368-1 (reinforced insulation), CSA 62368-1, CQC GB4943.1, and AEC-Q100 Grade 1. These approvals validate its use in safety-critical automotive and industrial equipment where regulatory compliance for isolation integrity and thermal reliability is mandatory.
Can SI88643EC-ISR generate 24 V isolated output?
Yes, SI88643EC-ISR can generate up to 24 V isolated output using the high-voltage configuration described in Figure 10 of the datasheet. This requires configuring the VSNS feedback divider for 24 V, selecting appropriate external components (Q1, R4, D1, T1), and ensuring the secondary-side load remains within 5 W peak capability. Output voltage is set solely by the R1/R2 resistor divider ratio.
SI88643EC-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:
- 1/3
- 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
SI88643EC-ISR FAQ
1.How can I place an order for SI88643EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88643EC-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 SI88643EC-ISR reliable?
The price and inventory of SI88643EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88643EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88643EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88643EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88643EC-ISR?
SI88643EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88643EC-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 SI88643EC-ISR?
For technical support, including SI88643EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88643EC-ISR requirements.
6.How does Aetrix verify that SI88643EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88643EC-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 SI88643EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88643EC-ISR?
All SI88643EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88643EC-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 SI88643EC-ISR part is unused and in its original packaging.
Return procedure for SI88643EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88643EC-ISR Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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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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