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Skyworks Solutions Inc. SI88641EC-ISR
- Part No.:
- SI88641EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88641EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,435
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Product details
Overview
SI88641EC-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, configured for high-voltage input (up to 24 V) to low-voltage output (3.3/5.0 V), delivering up to 2 W average isolated power, supporting data rates up to 100 Mbps, and achieving propagation delay ≤23 ns. It serves as a complete signal + power isolation solution in industrial motor drives and battery management systems.
For engineers reviewing the SI88641EC-ISR datasheet, SI88641EC-ISR pinout, SI88641EC-ISR application, or SI88641EC-ISR equivalent, key selection criteria include its external-switch flyback topology, programmable soft-start and frequency control, reinforced 5000 VRMS isolation rating, and AEC-Q100 qualification for automotive-grade designs requiring robust transient immunity (100 kV/µs typical).
Technical Context
The SI88641EC-ISR implements four unidirectional CMOS isolation channels using RF-based on/off keying across a silicon dioxide capacitive barrier, enabling noise-immune digital transmission without startup initialization. Its isolated DC-DC converter uses peak-current-mode-controlled flyback architecture with external NMOS switch drive via ESW pin and current sensing via RSN pin.
This variant belongs to the Si886xx subfamily optimized for high-voltage primary-side operation (≥5.5 V), requiring external power FET Q1 and sense resistor R4. It supports user-configurable switching frequency (200–800 kHz) via SH_FC/SS RC network and soft-start timing via capacitor on SS pin - features absent in Si882xx/Si884xx variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for one minute (UL 1577, reinforced insulation per IEC 62368-1) |
| 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 alignment in real-time control loops and feedback paths |
| DC-DC Output Power | 2 W average at 5 V (5 W peak) - sufficient to power secondary-side MCU, ADC, or gate drivers without auxiliary supply |
| Transient Immunity | 100 kV/µs typical - maintains signal integrity during fast-switching events in inverters and motor drives |
| Operating Temp | –40 °C to +125 °C - supports under-hood automotive and industrial ambient conditions |
| Regulatory Certifications | UL, CSA, VDE, CQC; AEC-Q100 Grade 1 qualified - meets functional safety requirements for ASIL-B systems |
Pinout & Package
SI88641EC-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 ≥8.3 mm for reinforced isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | VDDA, GNDA, RSN, ESW, VREGA, RSN | Primary-side analog power domain: VDDA powers isolator logic; ESW drives external NMOS; RSN senses switch current for overcurrent protection |
| 7, 8, 17, 18 | SH_FC, SS, NC, NC | Configurable control: SH_FC enables shutdown/frequency tuning; SS sets soft-start ramp time; NC pins must be left floating |
| 9–16 | A1–A4, B1–B4 | Four bidirectional-capable unidirectional channels: A1–A4 are primary-side inputs; B1–B4 are secondary-side outputs (or vice versa per direction config) |
| 19–24 | VDDP, VSNS, COMP, GNDB, VDDB, DNC/VREGB | Secondary-side power domain: VDDB powers isolated logic; VSNS feeds back output voltage; COMP sets loop stability; DNC/VREGB is Zener-referenced only if VOUT > 5.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated flyback controller with external FET drive | Enables 24 V primary-side operation while maintaining high efficiency (83% peak) and eliminating need for discrete gate drivers |
| Programmable soft-start via external capacitor | Prevents inrush current into secondary-side loads during power-up, critical for systems with large output capacitance or downstream regulators |
| User-adjustable switching frequency (200–800 kHz) | Allows EMI optimization by shifting switching harmonics away from sensitive bands (e.g., AM radio, CAN bus frequencies) |
| Secondary-side voltage sensing with isolated feedback | Eliminates optocouplers and associated bias circuitry, improving long-term reliability and load regulation accuracy (±1.5% typical) |
| Thermal shutdown and cycle-skipping at light loads | Protects against overheating during overload; reduces quiescent power consumption in standby modes without compromising regulation |
Applications
| Industrial Motor Control | Battery Management Systems (BMS) |
|---|---|
|
Use Scenario: Isolating gate driver signals and current-sense ADC interfaces in 3-phase inverter stacks operating at 600–1200 V bus voltages. IC Role / Device Role / Timing Role: SI88641EC-ISR provides simultaneous signal isolation (A1–A4/B1–B4) and local 5 V rail generation for isolated gate drivers and shunt amplifier supplies. Use Value: Eliminates separate isolated DC-DC modules, reducing PCB area by >40% and enabling compact, high-density inverter designs compliant with IEC 61800-5-1. |
Use Scenario: Monitoring cell voltages and temperatures across 96-cell EV battery packs, where each module requires isolated communication and local power. IC Role / Device Role / Timing Role: SI88641EC-ISR isolates UART/SPI daisy-chain commands from master controller while powering local ADCs and temperature sensors on each module. Use Value: Achieves ±0.5 mV cell voltage measurement accuracy by removing ground-loop errors and supplying clean, regulated 3.3 V to precision ADCs. |
| Industrial PLC Analog I/O Modules | Traction Inverter Control Units |
|
Use Scenario: Providing channel-to-channel isolation and independent power for 16-channel 4–20 mA transmitter circuits in hazardous-area-rated PLC backplanes. IC Role / Device Role / Timing Role: SI88641EC-ISR delivers isolated 5 V per channel group and transmits calibrated DAC output codes across the barrier with <23 ns skew. Use Value: Enables true galvanic separation between field-side and controller-side grounds, meeting SIL-2 requirements per IEC 61508 without external isolators. |
Use Scenario: Isolating PWM signals from MCU to SiC gate drivers and feeding isolated feedback (desaturation, temperature) to fault-detection logic in traction inverters. IC Role / Device Role / Timing Role: SI88641EC-ISR carries high-frequency PWM edges (up to 100 kHz) with minimal jitter and powers isolated desat detection comparators from its 5 V output. Use Value: Reduces system-level fault response time to <2 µs by integrating power + signal isolation, directly supporting ISO 26262 ASIL-D timing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel isolated power + signal applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6421ARWZ | Integrated internal switches (no external FET required); lower max input voltage (5.5 V); 1 W output power | Suitable for low-voltage systems (e.g., 3.3 V microcontrollers), not for 24 V primary-side conversion | Select when board space is constrained and primary supply ≤5.5 V; avoid for high-input-voltage BMS or motor control. |
| ISO7844FDWR | No integrated DC-DC; requires external isolated power supply; higher data rate (150 Mbps); 5000 VRMS isolation | Used where isolated power is already available (e.g., from separate DC-DC module), prioritizing speed over integration | Choose when signal integrity at >100 Mbps is critical and isolated power is sourced separately - adds component count but improves jitter performance. |
Compared with ADUM6421ARWZ and ISO7844FDWR, SI88641EC-ISR uniquely supports 24 V primary-side operation with external FET drive and delivers 2 W of regulated isolated power - making it the only option among the three capable of replacing both signal isolator and isolated DC-DC in high-voltage industrial and automotive subsystems.
Availability
SI88641EC-ISR is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and traction inverter designs requiring stable component supply, long lifecycle support, and automotive-grade reliability.
Supply support for SI88641EC-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 Si88xx family was designed to replace optocoupler-based isolation with higher reliability, speed, and integration - specifically targeting industrial automation, automotive electrification, and energy infrastructure applications demanding reinforced isolation and self-contained power.
FAQ
What is the maximum input voltage supported by SI88641EC-ISR's DC-DC converter?
The SI88641EC-ISR is designed for high-voltage primary-side operation, supporting input voltages up to 24 V. Its external-switch flyback architecture - controlled via ESW and RSN pins - enables safe and efficient conversion from 24 V to isolated 3.3 V or 5.0 V outputs. Input voltages exceeding 24 V are not supported and may damage the SI88641EC-ISR.
Does SI88641EC-ISR require an external transformer, and what are the validated part numbers?
Yes, SI88641EC-ISR requires an external miniature transformer. Validated options include UMEC UTB02250s (7–24 V input, 3.3–5.5 V output, 5 kVRMS), Coilcraft TA7788-AL (12 V input, 5/15 V output), and Mentech TTER09-0458S1 (8–24 V input, 8–24 V output). These transformers meet leakage inductance, turns ratio, and isolation rating requirements specified in AN901.
How does the soft-start function work on SI88641EC-ISR, and how is it configured?
The SI88641EC-ISR implements soft-start via an external capacitor connected to the SS pin (Pin 8). The capacitor value determines the ramp time of the DC-DC output voltage, limiting inrush current into downstream loads. Configuration follows the design equations in AN901; typical values range from 1 nF to 100 nF depending on required startup time and output capacitance.
Can SI88641EC-ISR be used in automotive applications, and what qualifications does it hold?
Yes, SI88641EC-ISR is AEC-Q100 Grade 1 qualified (–40 °C to +125 °C), UL 1577 certified (5000 VRMS), and compliant with IEC 62368-1 reinforced insulation standards. It is approved for automotive use in battery management systems, traction inverters, and vehicle communication interfaces - with full PPAP documentation and IMDS/CAMDS support available from Skyworks.
What is the role of the DNC/VREGB pin on SI88641EC-ISR, and when should it be connected?
The DNC/VREGB pin on SI88641EC-ISR is a Zener-referenced voltage output intended only when the isolated DC-DC output exceeds 5.5 V. If VOUT ≤ 5.5 V (e.g., standard 3.3 V or 5.0 V configurations), this pin must remain unconnected (DNC). Connecting it in low-voltage setups risks damaging the internal Zener diode and invalidating isolation certification.
SI88641EC-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:
- 3/1
- 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
SI88641EC-ISR FAQ
1.How can I place an order for SI88641EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88641EC-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 SI88641EC-ISR reliable?
The price and inventory of SI88641EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88641EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88641EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88641EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88641EC-ISR?
SI88641EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88641EC-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 SI88641EC-ISR?
For technical support, including SI88641EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88641EC-ISR requirements.
6.How does Aetrix verify that SI88641EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88641EC-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 SI88641EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88641EC-ISR?
All SI88641EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88641EC-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 SI88641EC-ISR part is unused and in its original packaging.
Return procedure for SI88641EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88641EC-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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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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