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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8420AD-D-IS

Name: SI8420AD-D-IS
Brand: Skyworks Solutions Inc.
SKU: SI8420AD-D-IS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8420AD-D-IS

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8420AD-D-IS.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:2,606

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Product details

Overview

SI8420AD-D-IS from Skyworks Solutions is a dual-channel, low-power digital isolator with 5 kV_RMS reinforced isolation, 1 Mbps maximum data rate, and selectable fail-safe low-default output state. It operates across 2.7–5.5 V supply rails on both sides and delivers <3.5 mA/channel at 1 Mbps (2.7 V), enabling compact isolated communication in space-constrained industrial power supplies.

For engineers reviewing the SI8420AD-D-IS datasheet, SI8420AD-D-IS pinout, SI8420AD-D-IS application, or SI8420AD-D-IS equivalent, key selection criteria include its SOIC-16 wide-body package, dual unidirectional channel configuration (2 inputs on VDD1 side, 0 on VDD2), AEC-Q100 qualification, and compliance with IEC 60747-5-5 and UL 1577 for reinforced insulation in safety-critical systems.

Technical Context

The SI8420AD-D-IS implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and ensuring deterministic timing. Its Schmitt-trigger inputs provide high noise immunity, while independent UVLO monitors on VDD1 and VDD2 guarantee robust operation during asymmetric power sequencing.

It supports fail-safe operation with logic-low default output when VDD1 is unpowered but VDD2 remains active-a critical feature for fault-tolerant motor gate drivers and isolated ADC interfaces where undefined states must be avoided during brownout conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Isolation rating	5 kV_RMS reinforced insulation per UL 1577 and IEC 60747-5-5-enables use in mains-connected industrial equipment requiring creepage/clearance compliance.
Max data rate	1 Mbps-sufficient for isolated feedback loops in SMPS, sensor interfaces, and slow serial control links without overspecifying cost or EMI.
Supply voltage	2.7–5.5 V on both VDD1 and VDD2-supports interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting.
Power consumption	<3.5 mA/channel at 1 Mbps, 2.7 V-reduces thermal load and extends battery life in isolated IoT edge nodes.
Propagation delay	≤35 ns worst-case-ensures tight timing margins in closed-loop motor control and real-time protection circuits.
Fail-safe mode	Default-low output during VDD1 loss-prevents unintended activation of downstream MOSFET gates or relay drivers in power-loss scenarios.
CMTI	≥20 kV/µs-maintains signal integrity in high-dv/dt environments like inverters and variable-frequency drives.

Pinout & Package

SI8420AD-D-IS is housed in a RoHS-compliant SOIC-16 wide-body package (WB SOIC-16) with 8.3 mm creepage and clearance, certified for reinforced insulation up to 5 kV_RMS.

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Input-side power supply	Supplies power to input-side logic and transmitter; UVLO threshold 2.15–2.5 V ensures clean startup.
GND1	Input-side ground reference	Return path for VDD1; must be separated from GND2 by ≥8.3 mm to maintain reinforced isolation barrier.
IN1, IN2	Digital input signals	Schmitt-trigger inputs with 0.45 V hysteresis-reject noise spikes common in industrial wiring.
NC	No-connect	Pins 5, 6, 11, 12 are internally unconnected; may be left floating or tied to GND/VDD1/VDD2 per layout needs.
VDD2	Output-side power supply	Supplies output driver and receiver; independent UVLO allows safe operation even if VDD1 fails.
GND2	Output-side ground reference	Return path for VDD2; galvanically isolated from GND1 to block ground loops and common-mode noise.
OUT1, OUT2	Isolated digital outputs	50 Ω nominal output impedance-requires controlled-impedance PCB traces for >10 MHz signals to avoid reflections.

Key Features

Feature	Design Value
RF-based isolation architecture	Eliminates optical degradation and capacitor aging-ensures stable propagation delay and CMTI over 25+ years of operation.
Selectably fail-safe output	Low-default state prevents false triggering in isolated gate drivers during input-side power loss-critical for IGBT/MOSFET safety.
Wide supply range (2.7–5.5 V)	Enables direct interface with 3.3 V MCUs and legacy 5 V peripherals without external regulators or level shifters.
AEC-Q100 qualified	Validated for automotive under-hood temperatures (–40 to 125 °C), supporting deployment in EV battery management and onboard chargers.
SOIC-16 wide-body package	Provides 8.3 mm creepage/clearance-meets IEC 61010-1 and IEC 60601-1 reinforced insulation requirements out-of-the-box.

Applications

Industrial Motor Control	Isolated Switch-Mode Power Supply
Use Scenario: Isolating PWM signals from MCU to half-bridge gate drivers in servo drives and HVAC compressors. IC Role / Device Role / Timing Role: Dual-channel unidirectional isolator transmitting IN1→OUT1 and IN2→OUT2 with ≤35 ns propagation delay skew. Use Value: Fail-safe low-default output prevents shoot-through during controller reset or VDD1 brownout-enhancing system reliability.	Use Scenario: Providing isolated feedback from secondary-side voltage/current sensors to primary-side PWM controller. IC Role / Device Role / Timing Role: Transmitting error amplifier output or current-sense pulses across isolation barrier with sub-1 Mbps bandwidth. Use Value: 5 kV_RMS reinforced insulation meets EN60950-1 requirements for Class I AC/DC converters without additional creepage spacing.
Medical Isolated Data Acquisition	Hybrid Electric Vehicle Battery Monitoring
Use Scenario: Isolating ADC serial interface (e.g., SPI clock/data) between patient-connected analog front-end and host processor. IC Role / Device Role / Timing Role: Dual-channel isolator handling SCLK and SDATA lines with precise channel-to-channel skew (<35 ns). Use Value: IEC 60601-1 reinforced insulation certification enables direct integration into Class BF/CF medical devices without custom isolation testing.	Use Scenario: Isolating cell voltage measurement data from battery pack monitoring ICs to central BMS controller. IC Role / Device Role / Timing Role: Transmitting low-speed telemetry (e.g., temperature, voltage) across 500 V DC bus barrier in traction battery modules. Use Value: AEC-Q100 qualification and –40 to 125 °C operation ensure long-term reliability in high-vibration, thermally aggressive EV underhood environments.

Industrial Motor Control

Isolated Switch-Mode Power Supply

Use Scenario: Isolating PWM signals from MCU to half-bridge gate drivers in servo drives and HVAC compressors.

IC Role / Device Role / Timing Role: Dual-channel unidirectional isolator transmitting IN1→OUT1 and IN2→OUT2 with ≤35 ns propagation delay skew.

Use Value: Fail-safe low-default output prevents shoot-through during controller reset or VDD1 brownout-enhancing system reliability.

Use Scenario: Providing isolated feedback from secondary-side voltage/current sensors to primary-side PWM controller.

IC Role / Device Role / Timing Role: Transmitting error amplifier output or current-sense pulses across isolation barrier with sub-1 Mbps bandwidth.

Use Value: 5 kV_RMS reinforced insulation meets EN60950-1 requirements for Class I AC/DC converters without additional creepage spacing.

Medical Isolated Data Acquisition

Hybrid Electric Vehicle Battery Monitoring

Use Scenario: Isolating ADC serial interface (e.g., SPI clock/data) between patient-connected analog front-end and host processor.

IC Role / Device Role / Timing Role: Dual-channel isolator handling SCLK and SDATA lines with precise channel-to-channel skew (<35 ns).

Use Value: IEC 60601-1 reinforced insulation certification enables direct integration into Class BF/CF medical devices without custom isolation testing.

Use Scenario: Isolating cell voltage measurement data from battery pack monitoring ICs to central BMS controller.

IC Role / Device Role / Timing Role: Transmitting low-speed telemetry (e.g., temperature, voltage) across 500 V DC bus barrier in traction battery modules.

Use Value: AEC-Q100 qualification and –40 to 125 °C operation ensure long-term reliability in high-vibration, thermally aggressive EV underhood environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SI8420BD-D-IS	Same SOIC-16 package and dual-channel topology, but rated for 150 Mbps data rate and higher supply current (3.7 mA/channel @ 1 Mbps, 2.7 V).	Targeted at high-speed isolated communication (e.g., isolated USB, fast SPI), not low-power feedback loops.	Select SI8420BD-D-IS only if system requires >1 Mbps throughput; otherwise SI8420AD-D-IS minimizes power and EMI.
ADUM1200ARZ	2-channel, 1 Mbps isolator in SOIC-8 narrow-body package; 2.5 kV_RMS isolation; no fail-safe option; higher typical supply current (4.4 mA/channel @ 1 Mbps, 3.3 V).	Limited to basic isolation in non-safety-critical consumer or lab equipment due to lower isolation rating and no default-state control.	Choose ADUM1200ARZ only for cost-sensitive, space-constrained designs where 5 kV_RMS and fail-safe behavior are unnecessary.

Compared with SI8420BD-D-IS and ADUM1200ARZ, SI8420AD-D-IS uniquely balances 5 kV_RMS reinforced insulation, fail-safe low-default output, and ultra-low 2.7 V operation-making it optimal for safety-certified, low-power industrial and automotive subsystems where deterministic fault behavior is mandatory.

Availability

SI8420AD-D-IS is available at Aetrix Electronics and suitable for industrial motor control, isolated switch-mode power supplies, medical data acquisition, and hybrid electric vehicle battery monitoring requiring stable component supply and long-term lifecycle support.

Supply support for SI8420AD-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 RF, timing, and isolation technologies for high-reliability applications.

The SI84xx family was designed specifically for replacing optocouplers in industrial, automotive, and medical systems-delivering superior data rate, timing precision, and isolation robustness in standard surface-mount packages.

FAQ

What is the isolation rating and safety certification of SI8420AD-D-IS?

The SI8420AD-D-IS provides 5 kV_RMS reinforced isolation and is certified to UL 1577 (5000 V_RMS/1 min), CSA Component Notice 5A, VDE IEC 60747-5-5, and IEC 60601-1/61010-1. These approvals validate its use in safety-critical systems such as medical equipment and industrial drives where galvanic separation must withstand sustained high voltage and transient surges.

Does SI8420AD-D-IS require external components for stable operation?

Yes, SI8420AD-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. Additional 1 µF capacitors and 100 Ω series resistors on input/output lines are recommended in noisy environments to enhance EMC robustness, per Skyworks' layout guidelines.

How does the fail-safe mode function in SI8420AD-D-IS?

In SI8420AD-D-IS, the fail-safe mode defaults outputs (OUT1/OUT2) to logic low when VDD1 is unpowered but VDD2 remains active. This behavior is hard-coded per ordering part number and prevents unintended activation of downstream power switches or actuators during input-side power loss-critical for functional safety in motor control and power conversion systems.

What is the maximum operating temperature and supply voltage range for SI8420AD-D-IS?

The SI8420AD-D-IS operates from –40 °C to +125 °C ambient temperature at full 1 Mbps data rate and supports supply voltages from 2.7 V to 5.5 V on both VDD1 and VDD2 rails. This wide range enables compatibility with 3.3 V microcontrollers and legacy 5 V logic, while the extended temperature rating supports deployment in automotive under-hood and industrial cabinet environments.

Can SI8420AD-D-IS replace optocouplers in existing designs?

Yes, SI8420AD-D-IS is a direct drop-in replacement for many 2-channel optocouplers (e.g., HCPL-0721, TLP2362) in SOIC-16 footprints. It offers identical pinout compatibility, eliminates LED aging and CTR degradation, improves propagation delay consistency (≤35 ns vs. ±100 ns typical for optos), and reduces supply current by >50% at 1 Mbps-enabling longer system lifetime and tighter timing control.

SI8420AD-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

SI8420AD-D-IS FAQ

1.How can I place an order for SI8420AD-D-IS through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8420AD-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 SI8420AD-D-IS reliable?

The price and inventory of SI8420AD-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 SI8420AD-D-IS is usually 5 days.

3.What payment methods are accepted for SI8420AD-D-IS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8420AD-D-IS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8420AD-D-IS?

SI8420AD-D-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8420AD-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 SI8420AD-D-IS?

For technical support, including SI8420AD-D-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8420AD-D-IS requirements.

6.How does Aetrix verify that SI8420AD-D-IS is sourced from the original manufacturer or authorized distributors?

All SI8420AD-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 SI8420AD-D-IS meets industry standards.

7.What is the process for return or replacement of SI8420AD-D-IS?

All SI8420AD-D-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8420AD-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 SI8420AD-D-IS part is unused and in its original packaging.

Return procedure for SI8420AD-D-IS:

1.Submit a request within 90 days.

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

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