My Inquiry
My Account
Skyworks Solutions Inc. SI88443EC-ISR
.jpg)
- Part No.:
- SI88443EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88443EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,380
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI88443EC-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, delivering up to 5 W output power at 3.3 V or 5.0 V, supporting data rates up to 100 Mbps, propagation delay ≤23 ns, and reinforced isolation rated at 5000 VRMS. It serves as a complete signal + power isolation solution in high-noise industrial motor drives and battery management systems.
For engineers reviewing the SI88443EC-ISR datasheet, SI88443EC-ISR pinout, SI88443EC-ISR application, or SI88443EC-ISR equivalent, this page delivers verified technical context, exact pin functions for SOIC-20W layout, real-world application mappings, and two validated alternative parts with documented functional and implementation differences.
Technical Context
The SI88443EC-ISR implements four unidirectional RF-based digital isolation channels across a silicon dioxide capacitive barrier, using on/off keying modulation for best-in-class noise immunity and magnetic field rejection. Its integrated flyback DC-DC controller operates with external NMOS switch (driven by ESW), current sensing via RSN, and secondary-side voltage feedback through VSNS.
This device belongs to the Si884xx series optimized for high-voltage input configurations (up to 24 V primary), requiring external power switch and shunt resistor, with fixed 250 kHz default switching frequency and no shutdown or soft-start pins - distinguishing it from Si882xx/3xx/6xx variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute (UL 1577, CSA 62368-1, VDE 62368-1) |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485, and CAN FD physical layer signaling |
| Propagation Delay | ≤23 ns max - enables precise timing-critical applications such as gate driver control and ADC sampling synchronization |
| DC-DC Output Power | Up to 5 W peak (2 W average at 5 V) - sufficient to power isolated microcontrollers, sensors, or transceivers without auxiliary supplies |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial environments with thermal shutdown protection |
| Transient Immunity | 100 kV/µs typical - ensures robust operation during fast-switching events in inverters and motor drives |
| Package | SOIC-20 wide-body (7.5 mm body width, creepage ≥8.3 mm) - meets reinforced insulation requirements for 250 V working voltage |
Pinout & Package
SI88443EC-ISR uses a 20-pin SOIC wide-body package (7.5 mm body width) with 8.3 mm creepage and clearance, certified for reinforced insulation per IEC 62368-1. Pin functions are defined per Figure 3 and Table 1 of the datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 9, 10 | HF XMTR / HF RCVR (A1–A4, B1–B4) | Four unidirectional digital isolation channels: A-side inputs (A1–A4), B-side outputs (B1–B4); RF-modulated signal transmission across isolation barrier |
| 7, 8 | RSN, ESW | Primary-side current sense input (RSN) and external NMOS gate driver output (ESW) - required for high-voltage flyback operation (e.g., 24 V input) |
| 11, 12, 15, 16 | VDDA, GNDA, VDDB, GNDB | Primary-side signal supply (VDDA ≤5.5 V) and ground (GNDA); secondary-side signal supply (VDDB) and ground (GNDB) - powered by internal DC-DC or external source |
| 17, 18, 19, 20 | GNDP, VSNS, COMP, DNC/VREGB | Primary-side power ground (GNDP); secondary-side feedback input (VSNS); compensation network node (COMP); Zener-referenced VREGB (DNC if VOUT ≤5.5 V) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Flyback DC-DC Controller | Supports 24 V primary input → 3.3/5.0/24 V isolated output with external FET, transformer, and rectifier - eliminates need for separate isolated power IC |
| Secondary-Side Voltage Sensing | VSNS feedback loop senses output directly on isolated side - achieves superior line/load regulation without optocouplers or bias circuitry |
| Capacitive Digital Isolation | Silicon dioxide barrier with RF on/off keying - provides 100 kV/µs CMTI, 100 Mbps data rate, and 23 ns propagation delay with no startup initialization |
| Reinforced Insulation Certification | UL 1577 (5000 VRMS), CSA/IEC 62368-1, VDE 62368-1 - enables single-component isolation in safety-critical industrial and automotive systems |
| AEC-Q100 Qualified | Grade 1 (–40 °C to +125 °C) qualification - validated for automotive traction inverters, BMS, and vehicle communication buses |
Applications
| Motor Drive Gate Control | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Isolating PWM signals and fault feedback between MCU and IGBT/SiC gate drivers in 3-phase inverters. IC Role / Device Role / Timing Role: SI88443EC-ISR provides four isolated logic channels plus regulated 5 V supply for gate driver ICs, replacing discrete isolators + isolated DC-DC modules. Use Value: Eliminates optocoupler timing skew and external power supply complexity while maintaining <23 ns channel-to-channel skew for synchronized switching. |
Use Scenario: Monitoring cell voltages and balancing commands across high-voltage battery stacks (e.g., 400–800 V EV packs). IC Role / Device Role / Timing Role: SI88443EC-ISR isolates analog front-end SPI bus and powers isolated ADCs/sensors on the high-side monitoring board. Use Value: Delivers 5 W isolated power to support multiple isolated measurement ICs, reducing BOM count and improving long-term reliability vs. transformer-based solutions. |
| Industrial PLC Analog I/O Module | Traction Inverter Current Sensing Interface |
|
Use Scenario: Providing galvanic isolation for 4–20 mA loop-powered analog inputs and digital status reporting in distributed control systems. IC Role / Device Role / Timing Role: SI88443EC-ISR isolates sensor data lines and supplies isolated 3.3 V to signal conditioning circuitry on the field-side PCB. Use Value: Enables compact, single-chip isolation + power for multi-channel analog modules - meets IEC 61000-4-5 surge immunity requirements with 5000 VRMS rating. |
Use Scenario: Isolating shunt-based current measurement signals from high-dv/dt inverter legs to MCU-based protection logic. IC Role / Device Role / Timing Role: SI88443EC-ISR transmits isolated current sample data and powers isolated op-amp buffers and comparators on the high-side sensing board. Use Value: Achieves >100 kV/µs common-mode transient immunity - prevents false triggering during 10 kA/µs switching transients in 100 kW+ traction inverters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad digital isolator with integrated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88442EC-ISR | Same SOIC-20W package and pinout; differs only in failsafe output state (low vs. high) during loss of input power or isolation barrier fault. | Used where default-low output is required for fail-safe gate driver disable or alarm activation upon power loss. | Select SI88442EC-ISR when system safety logic mandates active-low default behavior; otherwise SI88443EC-ISR is preferred for standard high-impedance or high-level default. |
| ADUM6420ARWZ | 4-channel isolator + isolated DC-DC (500 mW, not 5 W); uses iCoupler® transformer isolation; SOIC-20W package but different pin mapping (no RSN/ESW pins). | Limited to low-power isolated peripherals (e.g., isolated UART, low-current sensors); cannot drive gate drivers or high-current loads. | Choose ADUM6420ARWZ only for space-constrained, low-power applications where 500 mW isolated supply suffices; SI88443EC-ISR is required for >1 W load capability and high-voltage primary operation. |
Compared with SI88442EC-ISR, SI88443EC-ISR offers identical isolation performance and power capability but guarantees failsafe high output state - critical for enabling gate drivers on power-up. Versus ADUM6420ARWZ, SI88443EC-ISR delivers 10× more isolated power and supports 24 V primary inputs with external FET control, making it suitable for high-power industrial and automotive subsystems.
Availability
SI88443EC-ISR is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management, and isolated switch-mode power supply designs requiring stable component supply, long lifecycle support, and certified reinforced insulation.
Supply support for SI88443EC-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 for wireless, automotive, and industrial markets.
The Si88xx family was designed to replace optocoupler + discrete DC-DC combinations in high-reliability systems, integrating robust capacitive isolation and flexible flyback power conversion into a single certified package for industrial automation and electric vehicle applications.
FAQ
What is the maximum isolated DC-DC output power supported by SI88443EC-ISR?
The SI88443EC-ISR supports up to 5 W peak isolated output power, with 2 W average at 5 V. This is achieved using an external NMOS power switch driven by the ESW pin and current sensing via RSN - enabling high-efficiency flyback operation from 24 V primary inputs. The actual deliverable power depends on transformer selection, layout, and thermal management; validated reference designs achieve full 5 W with UMEC UTB02250s or Coilcraft TA7788-AL transformers.
Does SI88443EC-ISR include built-in shutdown or soft-start functionality?
No, SI88443EC-ISR does not include shutdown (SH) or soft-start (SS) pins - these features are absent in all Si884xx devices per datasheet Section 2.3.1 and 2.3.2. Unlike Si882xx/3xx/6xx variants, SI88443EC-ISR relies on external circuitry for controlled startup and disable. Its fixed 250 kHz switching frequency and lack of SH/SS pins simplify design for high-voltage primary applications where deterministic timing is prioritized over programmability.
What transformer is recommended for use with SI88443EC-ISR in a 24 V to 5 V isolated power design?
For 24 V input to 5 V output, Skyworks validates the UMEC UTB02250s (turns ratio 3.0:1.0, 25 µH primary inductance, 5 kVRMS isolation) and Coilcraft TA7788-AL (1.00:1.25:0.75 triple winding, 5 kVRMS). Both meet leakage inductance (<600 nH), primary resistance (<0.49 Ω), and isolation requirements specified in AN901. These transformers enable full 5 W output with <83% peak efficiency when paired with appropriate Schottky diode and output capacitor selection.
How does the failsafe output behavior of SI88443EC-ISR differ from SI88442EC-ISR?
SI88443EC-ISR defaults to high-state output on all four channels during power loss, isolation barrier failure, or undervoltage lockout - ensuring gate drivers remain enabled unless actively commanded off. In contrast, SI88442EC-ISR defaults to low-state output under the same conditions. This difference is hardwired in silicon and affects system-level safety architecture; SI88443EC-ISR is selected when fail-high behavior aligns with functional safety goals (e.g., safe torque off not required on initial fault).
Can SI88443EC-ISR operate with a 3.3 V primary supply?
No - SI88443EC-ISR is designed exclusively for high-voltage primary operation (up to 24 V), requiring external NMOS switching via ESW and current sensing via RSN. It lacks internal power switches and cannot function with 3.3 V or 5 V primary supplies. For low-voltage input applications, Skyworks specifies Si882xx or Si883xx families (e.g., SI88243ED-IS), which integrate internal switches and support 3–5.5 V primary inputs.
SI88443EC-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 20-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:
- 20-SOIC
SI88443EC-ISR FAQ
1.How can I place an order for SI88443EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88443EC-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 SI88443EC-ISR reliable?
The price and inventory of SI88443EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88443EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88443EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88443EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88443EC-ISR?
SI88443EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88443EC-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 SI88443EC-ISR?
For technical support, including SI88443EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88443EC-ISR requirements.
6.How does Aetrix verify that SI88443EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88443EC-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 SI88443EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88443EC-ISR?
All SI88443EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88443EC-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 SI88443EC-ISR part is unused and in its original packaging.
Return procedure for SI88443EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88443EC-ISR Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
