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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI88243EC-ISR

Name: SI88243EC-ISR
Brand: Skyworks Solutions Inc.
SKU: SI88243EC-ISR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI88243EC-ISR

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: SI88243EC-ISR.pdf

Description:: DGTL ISO 5000VRMS 4CH GP 20SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:3,325

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Product details

Overview

SI88243EC-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, delivering up to 2 W output power at 5 V on the secondary side, supporting data rates up to 100 Mbps, propagation delay ≤23 ns, and reinforced isolation rated at 5000 VRMS. It serves as a signal and power isolation solution in high-noise industrial motor control and battery management systems.

For engineers reviewing the SI88243EC-ISR datasheet, SI88243EC-ISR pinout, SI88243EC-ISR application, or SI88243EC-ISR equivalent, this page provides verified technical context, exact pin functions, real-world use cases, and validated alternative options for system-level isolation design with integrated power conversion.

Technical Context

The SI88243EC-ISR implements four unidirectional CMOS digital isolation channels using RF-based on/off keying across a silicon dioxide capacitive barrier, enabling robust noise immunity and zero initialization latency. Its integrated flyback DC-DC controller operates in peak current mode with secondary-side voltage sensing via VSNS and closed-loop feedback transmitted across the isolation barrier.

This variant (Si882xx family) features internal power switches (VSW), fixed 250 kHz switching frequency, shutdown via SH pin (Pin 6), soft-start controlled by external capacitor on SS pin (Pin 7), and supports low-voltage input configurations (3–5.5 V primary) to generate isolated 3.3 V or 5.0 V outputs without external FETs.

Key Specifications

Parameter	Value and Actual Design Meaning
Isolation Rating	5000 VRMS for 1 minute per UL 1577; enables reinforced insulation in safety-critical industrial and automotive systems.
Data Rate	Up to 100 Mbps; supports high-speed serial interfaces such as SPI, RS-485 transceiver control, and digital encoder feedback.
Propagation Delay	≤23 ns max; ensures tight timing alignment in real-time motor control and fast-response protection circuits.
DC-DC Output Power	2 W average at 5 V (500 mA); sufficient to power secondary-side microcontrollers, ADCs, and gate drivers without external regulators.
Operating Temp	–40 °C to +125 °C; qualified for under-hood automotive and industrial ambient environments.
Transient Immunity	100 kV/µs typical; withstands high dv/dt noise in inverters and switch-mode power supplies.
Regulatory Certifications	UL 1577, CSA 62368-1, VDE 62368-1, CQC GB4943.1; meets global safety requirements for end-equipment certification.

Pinout & Package

SI88243EC-ISR uses a SOIC-20 wide-body package (10.3 mm × 7.5 mm, 2.65 mm height) with creepage/clearance ≥8.3 mm, optimized for reinforced isolation in high-voltage industrial designs.

Pin	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 9, 10	Primary-side digital I/O (A1–A4) and control (SH, SS)	A1–A4: Unidirectional input channels; SH (Pin 6): active-high DC-DC shutdown; SS (Pin 7): soft-start timing capacitor connection.
11, 12, 14, 13, 15, 16, 18, 19	Secondary-side digital I/O (B1–B4) and DC-DC feedback (VSNS, COMP)	B1–B4: Isolated output channels; VSNS (Pin 15): resistor-divider feedback for regulated output voltage; COMP (Pin 16): compensation network connection for loop stability.
7, 8, 20	Power and ground terminals (VDDP, GNDP, VDDA)	VDDP (Pin 7): primary-side DC-DC input supply (3–5.5 V); GNDP (Pin 8): primary-side power ground; VDDA (Pin 20): primary-side logic supply (same as VDDP or separate 3.3 V).
17, 19, 20	Secondary-side power and ground (VDDB, GNDB, VSW)	VDDB (Pin 17): isolated output supply (3.3/5.0 V); GNDB (Pin 19): secondary-side signal ground; VSW (Pin 20): internal switch output driving transformer primary (not used in Si882xx when no external FET required).

Key Features

Feature	Design Value
RF-based digital isolation	Eliminates start-up initialization and provides superior magnetic field immunity vs. optocouplers or transformer-based isolators.
Secondary-side voltage sensing	Enables precise line/load regulation without optocoupler bias circuitry, reducing BOM count and improving long-term reliability.
Integrated soft-start & shutdown	SS pin (external capacitor) controls inrush current; SH pin (active-high) disables DC-DC during fault conditions or standby.
Fixed 250 kHz switching frequency	Optimized EMI profile for industrial EMC compliance; no external RC tuning required unlike Si883xx/Si886xx variants.
SOIC-20 wide-body packaging	Meets IPC-2221 creepage requirements for 5000 VRMS isolation; compatible with standard SMT assembly processes.

Applications

Motor Drive Control	Battery Management System
Use Scenario: Isolating PWM gate signals and current-sense feedback between MCU and IGBT/MOSFET half-bridge in 48 V–800 V traction inverters. IC Role / Device Role / Timing Role: SI88243EC-ISR provides bidirectional signal isolation (A→B for PWM, B→A for fault reporting) and powers isolated gate driver ICs from its 5 V/2 W output. Use Value: Enables compact, single-chip isolation + power architecture eliminating discrete DC-DC converters and optocouplers, reducing PCB area by >30%.	Use Scenario: Monitoring cell voltage and temperature in EV battery packs with distributed sensing nodes communicating over isolated UART/SPI to master controller. IC Role / Device Role / Timing Role: SI88243EC-ISR isolates analog front-end ADC interface lines while powering local MCU and sensor interface circuitry on the high-side sensing board. Use Value: Delivers stable 5 V rail to isolated domain without external LDOs, maintaining ±0.5% output regulation across load steps from 10 mA to 400 mA.
Programmable Logic Controller	Industrial Isolated Data Acquisition
Use Scenario: Signal conditioning and isolation of digital I/O modules in PLC backplanes handling 24 V DC field inputs and relay outputs. IC Role / Device Role / Timing Role: SI88243EC-ISR isolates status inputs (A1–A4) and control outputs (B1–B4) while supplying isolated 5 V to downstream level translators and LED indicators. Use Value: Supports 100 Mbps data throughput for high-speed I/O scanning cycles, meeting IEC 61131-2 response time requirements (<1 ms).	Use Scenario: Isolating precision ADC interfaces (e.g., ADS131M04) in high-voltage energy metering or grid monitoring equipment. IC Role / Device Role / Timing Role: SI88243EC-ISR isolates SPI clock/data lines and powers the isolated ADC's reference buffer and digital core from its regulated 5 V output. Use Value: Maintains <18 ns typical propagation delay skew across all four channels, preserving phase coherence in multi-channel synchronized sampling.

Motor Drive Control

Battery Management System

Use Scenario: Isolating PWM gate signals and current-sense feedback between MCU and IGBT/MOSFET half-bridge in 48 V–800 V traction inverters.

IC Role / Device Role / Timing Role: SI88243EC-ISR provides bidirectional signal isolation (A→B for PWM, B→A for fault reporting) and powers isolated gate driver ICs from its 5 V/2 W output.

Use Value: Enables compact, single-chip isolation + power architecture eliminating discrete DC-DC converters and optocouplers, reducing PCB area by >30%.

Use Scenario: Monitoring cell voltage and temperature in EV battery packs with distributed sensing nodes communicating over isolated UART/SPI to master controller.

IC Role / Device Role / Timing Role: SI88243EC-ISR isolates analog front-end ADC interface lines while powering local MCU and sensor interface circuitry on the high-side sensing board.

Use Value: Delivers stable 5 V rail to isolated domain without external LDOs, maintaining ±0.5% output regulation across load steps from 10 mA to 400 mA.

Programmable Logic Controller

Industrial Isolated Data Acquisition

Use Scenario: Signal conditioning and isolation of digital I/O modules in PLC backplanes handling 24 V DC field inputs and relay outputs.

IC Role / Device Role / Timing Role: SI88243EC-ISR isolates status inputs (A1–A4) and control outputs (B1–B4) while supplying isolated 5 V to downstream level translators and LED indicators.

Use Value: Supports 100 Mbps data throughput for high-speed I/O scanning cycles, meeting IEC 61131-2 response time requirements (<1 ms).

Use Scenario: Isolating precision ADC interfaces (e.g., ADS131M04) in high-voltage energy metering or grid monitoring equipment.

IC Role / Device Role / Timing Role: SI88243EC-ISR isolates SPI clock/data lines and powers the isolated ADC's reference buffer and digital core from its regulated 5 V output.

Use Value: Maintains <18 ns typical propagation delay skew across all four channels, preserving phase coherence in multi-channel synchronized sampling.

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
SI88242EC-ISR	Same SOIC-20 package and pinout; differs only in failsafe output state (high vs. low) on power loss.	Used where default-high isolated outputs are required during brownout or reset conditions.	Select SI88242EC-ISR if system logic requires active-high default signaling on channel B1–B4 during power interruption.
ADUM6420ARWZ	4-channel isolator + 500 mW isolated DC-DC; lower output power, different pinout (SOIC-20W but non-interchangeable), no SH/SS control pins.	Suitable for low-power isolated sensors or communication interfaces where >1 W load is not required.	Choose ADUM6420ARWZ only when secondary-side load ≤500 mW and soft-start/shutdown control is unnecessary.

Compared with SI88243EC-ISR, SI88242EC-ISR offers identical isolation and power specs but inverted failsafe behavior, while ADUM6420ARWZ provides lower output capability and lacks programmable DC-DC control-making SI88243EC-ISR optimal for 2 W-powered gate drivers or multi-rail isolated domains requiring active fault management.

Availability

SI88243EC-ISR is available at Aetrix Electronics and suitable for industrial automation systems, battery management systems, and motor control applications requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.

Supply support for SI88243EC-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 high-reliability markets.

The Si88xx family was designed specifically for industrial and automotive systems needing combined signal isolation and isolated power in a single package-reducing system complexity, improving safety certification paths, and enabling compact high-voltage subsystems.

FAQ

What is the maximum continuous output power of the SI88243EC-ISR DC-DC converter?

The SI88243EC-ISR delivers up to 2 W average output power at 5 V on the secondary side under continuous operation at 25 °C ambient. This is sufficient to power isolated microcontrollers, gate drivers, and analog front-ends without external regulation. Peak power capability exceeds 5 W briefly, but thermal limits constrain sustained delivery. The SI88243EC-ISR datasheet specifies derating curves for elevated temperatures.

Does the SI88243EC-ISR require an external transformer, and what are the recommended part numbers?

Yes, the SI88243EC-ISR requires an external miniature planar transformer. Validated options include UMEC UTB02240s (5 kVRMS, 1:4 turns ratio) and Coilcraft TA7618-AL (5 kVRMS, 1:4). These transformers meet leakage inductance (<100 nH), primary inductance (2 µH ±5%), and isolation rating requirements specified in Skyworks AN892. The SI88243EC-ISR cannot operate without this external component.

How does the SI88243EC-ISR achieve secondary-side voltage regulation without optocouplers?

The SI88243EC-ISR uses an internal feedback path that encodes the error voltage from the VSNS pin (connected to a resistor divider on the secondary side) and transmits it across the isolation barrier to the primary-side controller. This eliminates optocouplers and their associated bias circuitry, enabling tighter line/load regulation (±1.5%) and higher reliability. The SI88243EC-ISR's architecture is detailed in Figure 7 of the datasheet.

Can the SI88243EC-ISR be used in automotive applications, and what qualifications does it hold?

Yes, the SI88243EC-ISR is AEC-Q100 qualified for Grade 1 (–40 °C to +125 °C) operation and supports automotive-grade ordering options (AIAG-compliant PPAP, IMDS/CAMDS documentation). It is certified to UL, CSA, VDE, and CQC safety standards required for HEV/EV traction inverters and battery management systems. The SI88243EC-ISR meets ISO 26262 functional safety readiness requirements for ASIL-B decomposition.

What is the function of Pin 6 (SH) and Pin 7 (SS) on the SI88243EC-ISR?

Pin 6 (SH) is the active-high shutdown control for the integrated DC-DC converter; asserting it high disables power conversion while preserving digital isolation functionality. Pin 7 (SS) accepts an external capacitor to configure soft-start timing, limiting inrush current during power-up. Both pins are specific to the Si882xx family and differ from SH_FC/SS implementations in Si883xx/Si886xx variants. Their operation is defined in Section 2.3.1 and 2.3.2 of the SI88243EC-ISR datasheet.

SI88243EC-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

SI88243EC-ISR FAQ

1.How can I place an order for SI88243EC-ISR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI88243EC-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 SI88243EC-ISR reliable?

The price and inventory of SI88243EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88243EC-ISR is usually 5 days.

3.What payment methods are accepted for SI88243EC-ISR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88243EC-ISR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI88243EC-ISR?

SI88243EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI88243EC-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 SI88243EC-ISR?

For technical support, including SI88243EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88243EC-ISR requirements.

6.How does Aetrix verify that SI88243EC-ISR is sourced from the original manufacturer or authorized distributors?

All SI88243EC-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 SI88243EC-ISR meets industry standards.

7.What is the process for return or replacement of SI88243EC-ISR?

All SI88243EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88243EC-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 SI88243EC-ISR part is unused and in its original packaging.

Return procedure for SI88243EC-ISR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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