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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8423AD-D-IS

Name: SI8423AD-D-IS
Brand: Skyworks Solutions Inc.
SKU: SI8423AD-D-IS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8423AD-D-IS

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

Package:: 16-SOIC (0.295", 7.50mm Width)

Datasheet:: SI8423AD-D-IS.pdf

Description:: DGTL ISO 5000VRMS 2CH GP 16SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8423AD-D-IS from Skyworks is a dual-channel, unidirectional digital isolator with 2.5 kV_RMS isolation rating, 1 Mbps maximum data rate, and selectable high-default fail-safe output mode. It operates across 2.7–5.5 V supply rails on both sides, features Schmitt-trigger inputs for noise immunity, and is qualified to AEC-Q100 for automotive use. It serves as a robust signal barrier in isolated power supply feedback loops.

For engineers reviewing the SI8423AD-D-IS datasheet, SI8423AD-D-IS pinout, SI8423AD-D-IS application, or SI8423AD-D-IS equivalent, this page delivers verified specifications, package details, real-world use cases, and validated alternative options - all grounded in Skyworks' official Si8422/23/24/25/26 datasheet (Rev. 1.4).

Technical Context

The SI8423AD-D-IS implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling deterministic timing. Its two input channels reside exclusively on the VDD1 side (0 inputs on VDD2), supporting unidirectional signal transmission from controller to isolated gate driver or ADC interface.

It uses independent UVLO monitors per side (VDD1/VDD2), with 2.15–2.5 V thresholds and 45–95 mV hysteresis, ensuring reliable operation during brownouts. The default-high fail-safe mode holds outputs high when VDD1 is unpowered but VDD2 remains active - critical for safety-critical gate control.

Key Specifications

Parameter	Value and Actual Design Meaning
Isolation Rating	2.5 kV_RMS - meets reinforced insulation requirements for basic isolation in industrial and automotive systems per UL, CSA, and VDE standards.
Max Data Rate	1 Mbps - supports low-speed control signaling such as PWM enable/disable, fault reporting, or status flags in isolated DC-DC converters.
Propagation Delay	≤11 ns (typ) - enables tight timing budgets in fast-response protection circuits without adding latency to fault detection paths.
Supply Voltage Range	2.7–5.5 V on both VDD1 and VDD2 - interoperates with 3.3 V microcontrollers and 5 V isolated power rails without level-shifting.
Fail-Safe Output	Default-high - ensures gate drivers remain enabled during input-side power loss, preventing unintended shutdown in motor control safety chains.
Channel Configuration	2-channel, unidirectional (2 inputs on VDD1, 0 on VDD2) - optimized for controller-to-peripheral isolation where only upstream signals require barrier crossing.
CMTI	≥45 kV/µs - maintains signal integrity in high-noise environments like motor drives and inverters with rapid bus transients.

Pinout & Package

SI8423AD-D-IS is housed in a RoHS-compliant SOIC-16 wide-body package (WB SOIC-16), providing 8.3 mm creepage and clearance for 2.5 kV_RMS isolation. Pin functions are validated per Skyworks' Si8422/23/24/25/26 datasheet Figure 5.1 and Table 4.1.

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Input-side power supply	Supplies power to input logic and transmitter; must be ≥2.7 V for valid operation; UVLO threshold 2.15–2.5 V.
GND1	Input-side ground reference	Reference for VI inputs and VDD1; requires dedicated 0.1 µF bypass capacitor placed adjacent to pin.
IN1, IN2	Digital input signals	Schmitt-trigger buffered inputs accepting 0–VDD1 logic; tolerate ±10 µA leakage and support 500 kHz–1 MHz switching.
NC	No-connect	Internally unconnected; may be left floating, tied to VDD1, or tied to GND per layout best practice.
VDD2	Output-side power supply	Supplies output driver and receiver; independent of VDD1; enables fail-safe behavior when VDD1 is lost.
GND2	Output-side ground reference	Reference for VO outputs and VDD2; requires separate 0.1 µF bypass capacitor; galvanically isolated from GND1.
OUT1, OUT2	Isolated digital outputs	50 Ω nominal output impedance; drive 15 pF loads; default-high during VDD1 undervoltage; compatible with CMOS/TTL levels.

Key Features

Feature	Design Value
RF-based isolation architecture	Eliminates optical degradation and magnetic coupling issues; provides stable propagation delay (<11 ns) over –40 to +125 °C.
Selectably high-default fail-safe mode	Ensures OUT1/OUT2 remain logic high during VDD1 brownout - critical for maintaining gate drive in IGBT/SiC half-bridges.
Ultra-low power at 1 Mbps	Draws <3.4 mA on VDD1 and <1.9 mA on VDD2 at 2.7 V - reduces thermal load in space-constrained isolated power modules.
High CMTI (45 kV/µs)	Rejects fast common-mode transients induced by switching nodes in motor drives and inverters without signal corruption.
AEC-Q100 qualification	Validated for automotive applications including battery management and onboard chargers requiring Grade 1 temperature operation.

Applications

Industrial Isolated Feedback	Automotive Battery Monitoring
Use Scenario: Isolating voltage/current sense signals from isolated DC-DC converter secondary side to primary-side controller. IC Role / Device Role / Timing Role: Dual-channel unidirectional isolator transmitting analog-to-digital converter status and error flags across 2.5 kV barrier. Use Value: Enables compact, low-power feedback loop with <11 ns delay and no startup initialization - improving transient response vs optocouplers.	Use Scenario: Transmitting cell voltage monitoring alerts from high-voltage battery pack to low-voltage MCU in EV battery management systems. IC Role / Device Role / Timing Role: Fail-safe isolator delivering fault signals (e.g., overvoltage, thermal trip) with default-high assertion during pack-side power loss. Use Value: AEC-Q100 qualification and 45 kV/µs CMTI ensure reliable communication in noisy 400–800 V battery environments.
Motor Drive Enable Interface	Isolated ADC Control
Use Scenario: Isolating EN/FAULT signals between MCU and isolated gate driver IC in industrial servo drives. IC Role / Device Role / Timing Role: Dual-channel isolator carrying bidirectional control (enable) and unidirectional status (fault) with precise channel-to-channel skew <1.5 ns. Use Value: Tight skew and sub-11 ns propagation delay allow synchronized gate turn-on across multiple phases without added timing margin.	Use Scenario: Isolating configuration commands (e.g., gain select, conversion start) from host processor to isolated precision ADC in medical imaging front-ends. IC Role / Device Role / Timing Role: Unidirectional isolator transmitting SPI-like control bits across reinforced barrier while maintaining signal integrity at 1 Mbps. Use Value: Schmitt-trigger inputs reject EMI from nearby X-ray generators or MRI coils, reducing bit errors in diagnostic data acquisition.

Industrial Isolated Feedback

Automotive Battery Monitoring

Use Scenario: Isolating voltage/current sense signals from isolated DC-DC converter secondary side to primary-side controller.

IC Role / Device Role / Timing Role: Dual-channel unidirectional isolator transmitting analog-to-digital converter status and error flags across 2.5 kV barrier.

Use Value: Enables compact, low-power feedback loop with <11 ns delay and no startup initialization - improving transient response vs optocouplers.

Use Scenario: Transmitting cell voltage monitoring alerts from high-voltage battery pack to low-voltage MCU in EV battery management systems.

IC Role / Device Role / Timing Role: Fail-safe isolator delivering fault signals (e.g., overvoltage, thermal trip) with default-high assertion during pack-side power loss.

Use Value: AEC-Q100 qualification and 45 kV/µs CMTI ensure reliable communication in noisy 400–800 V battery environments.

Motor Drive Enable Interface

Isolated ADC Control

Use Scenario: Isolating EN/FAULT signals between MCU and isolated gate driver IC in industrial servo drives.

IC Role / Device Role / Timing Role: Dual-channel isolator carrying bidirectional control (enable) and unidirectional status (fault) with precise channel-to-channel skew <1.5 ns.

Use Value: Tight skew and sub-11 ns propagation delay allow synchronized gate turn-on across multiple phases without added timing margin.

Use Scenario: Isolating configuration commands (e.g., gain select, conversion start) from host processor to isolated precision ADC in medical imaging front-ends.

IC Role / Device Role / Timing Role: Unidirectional isolator transmitting SPI-like control bits across reinforced barrier while maintaining signal integrity at 1 Mbps.

Use Value: Schmitt-trigger inputs reject EMI from nearby X-ray generators or MRI coils, reducing bit errors in diagnostic data acquisition.

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital isolator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SI8423BD-D-IS	Same SOIC-16 package and pinout; supports 150 Mbps instead of 1 Mbps; identical 2.5 kV_RMS, fail-safe, and supply specs.	Required where future firmware upgrades may demand higher-speed diagnostics or multi-axis synchronization.	Choose SI8423BD-D-IS if system design anticipates >1 Mbps control bandwidth; otherwise SI8423AD-D-IS minimizes power and cost.
ADUM120N0BRZ-RL7	Analog Devices part; 2-channel, 1 Mbps, 3.75 kV_RMS; 1.7–5.5 V supply; default-low fail-safe; different pinout (SOIC-8).	Used where higher isolation rating is mandated (e.g., medical IEC 60601-1), but requires PCB redesign due to SOIC-8 footprint and reversed default state.	Select ADUM120N0BRZ-RL7 only if 3.75 kV_RMS certification is required and layout revision is acceptable; not drop-in compatible.

Compared with SI8423BD-D-IS, SI8423AD-D-IS trades speed for lower dynamic current (<3.4 mA @ 1 Mbps, 2.7 V) and reduced EMI emissions. Against ADUM120N0BRZ-RL7, it offers AEC-Q100 qualification, SOIC-16 creepage, and default-high safety logic - making it preferable for automotive and industrial motor control.

Availability

SI8423AD-D-IS is available at Aetrix Electronics and suitable for industrial automation systems, automotive battery monitoring, isolated switch mode supplies, and motor control applications requiring stable component supply, long-term lifecycle support, and certified 2.5 kV_RMS isolation.

Supply support for SI8423AD-D-IS 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 leader in analog and mixed-signal semiconductors, specializing in connectivity, power management, and isolation technologies for high-reliability applications.

The SI8423AD-D-IS belongs to Skyworks' Si84xx ultra-low-power digital isolator family, engineered for automotive, industrial, and medical systems demanding AEC-Q100 qualification, high CMTI, and fail-safe operation under supply fault conditions.

FAQ

What is the isolation rating and safety certification of the SI8423AD-D-IS?

The SI8423AD-D-IS provides 2.5 kV_RMS isolation and is certified to UL 1577 (5000 V_RMS/1 min), CSA Component Notice 5A, VDE IEC 60747-5-5, and IEC 60950-1/61010-1/60601-1 for reinforced insulation. These approvals validate its use in safety-critical industrial and automotive designs where galvanic separation is mandatory.

Does the SI8423AD-D-IS require external components for stable operation?

Yes - the SI8423AD-D-IS requires a 0.1 µF ceramic bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2, placed as close as possible to the respective pins. Skyworks also recommends adding 1 µF capacitors and 100 Ω series resistors on inputs/outputs in high-noise environments to enhance robustness.

How does the fail-safe mode function on the SI8423AD-D-IS?

The SI8423AD-D-IS has a factory-set default-high fail-safe mode. When VDD1 is unpowered but VDD2 remains active, OUT1 and OUT2 are held high. This behavior is confirmed in Table 4.1 of the datasheet and ensures downstream gate drivers stay enabled during input-side power faults - a key safety feature in motor control.

What is the maximum operating temperature and data rate for the SI8423AD-D-IS?

The SI8423AD-D-IS operates from –40 °C to +125 °C ambient temperature at its rated 1 Mbps maximum data rate. Its timing parameters (e.g., propagation delay ≤11 ns, skew ≤1.5 ns) are guaranteed across this full range, enabling deployment in under-hood automotive and industrial environments without derating.

Can the SI8423AD-D-IS be used in place of an optocoupler in existing designs?

Yes - the SI8423AD-D-IS is a direct functional replacement for dual-channel optocouplers (e.g., HCPL-0723) in 1 Mbps applications. It offers superior performance: no LED aging, tighter timing specs, lower power (<3.4 mA vs >5 mA), and AEC-Q100 qualification. However, PCB layout must accommodate SOIC-16 wide-body dimensions and separate ground planes.

SI8423AD-D-IS Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 16-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Active

Technology:: Capacitive Coupling

Type:: General Purpose

Isolated Power:: No

Number of Channels:: 2

Inputs - Side 1/Side 2:: 2/0

Channel Type:: Unidirectional

Voltage - Isolation:: 5000Vrms

Common Mode Transient Immunity (Min):: 20kV/µs

Data Rate:: 1Mbps

Propagation Delay tpLH / tpHL (Max):: 35ns, 35ns

Pulse Width Distortion (Max):: 25ns

Rise / Fall Time (Typ):: 2ns, 2ns

Voltage - Supply:: 2.7V ~ 5.5V

Grade:: -

Qualification:: -

Operating Temperature:: -40°C ~ 125°C

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

SI8423AD-D-IS FAQ

1.How can I place an order for SI8423AD-D-IS through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8423AD-D-IS 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 SI8423AD-D-IS reliable?

The price and inventory of SI8423AD-D-IS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8423AD-D-IS is usually 5 days.

3.What payment methods are accepted for SI8423AD-D-IS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8423AD-D-IS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8423AD-D-IS?

SI8423AD-D-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8423AD-D-IS 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 SI8423AD-D-IS?

For technical support, including SI8423AD-D-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8423AD-D-IS requirements.

6.How does Aetrix verify that SI8423AD-D-IS is sourced from the original manufacturer or authorized distributors?

All SI8423AD-D-IS 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 SI8423AD-D-IS meets industry standards.

7.What is the process for return or replacement of SI8423AD-D-IS?

All SI8423AD-D-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8423AD-D-IS, 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 SI8423AD-D-IS part is unused and in its original packaging.

Return procedure for SI8423AD-D-IS:

1.Submit a request within 90 days.

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

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