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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8423BD-D-IS

Name: SI8423BD-D-IS
Brand: Skyworks Solutions Inc.
SKU: SI8423BD-D-IS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8423BD-D-IS

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8423BD-D-IS.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8423BD-D-IS from Skyworks is a dual-channel, high-speed digital isolator with 5 kV_RMS reinforced isolation, 150 Mbps data rate, <11 ns propagation delay, and selectable high-fail-safe output mode-designed for isolated communication in industrial motor control and medical power supplies.

For engineers reviewing the SI8423BD-D-IS datasheet, SI8423BD-D-IS pinout, SI8423BD-D-IS application, or SI8423BD-D-IS equivalent, this page delivers verified electrical specs, package mapping to SOIC-16 wide-body, fail-safe behavior under UVLO, CMTI of 45 kV/µs, and direct alternatives for dual-channel 5 kV isolators operating at 2.7–5.5 V.

Technical Context

The SI8423BD-D-IS implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling deterministic timing. Its two independent input-to-output channels operate with Schmitt-trigger inputs and support asymmetric supply configurations (VDD1/VDD2 = 2.7–5.5 V).

It features programmable fail-safe default output (high) during input-side undervoltage conditions, with UVLO thresholds at 2.3 V ±0.15 V and hysteresis of 75 mV. Propagation delay skew between channels is ≤0.5 ns, and pulse width distortion is ≤1.5 ns-enabling precise synchronization in isolated gate drivers and ADC interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	DC to 150 Mbps - supports high-speed SPI, RS-485, and isolated PWM feedback without oversampling.
Isolation Rating	5000 V_RMS for 1 minute - meets reinforced insulation requirements per IEC 60950-1, IEC 60601-1, and UL 1577.
Propagation Delay	≤11 ns max - enables sub-10 ns timing-critical signal transfer in real-time motor control loops.
CMTI	45 kV/µs min - ensures robust operation in noisy inverter and SMPS environments with fast dv/dt transients.
Supply Voltage	2.7–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level shifters.
Fail-Safe Mode	Default-high output on VDD1 loss - maintains safe logic state in isolated gate driver enable paths during controller power faults.
Channel Count	Dual unidirectional (2-in, 0-out) - provides isolated control signals for half-bridge upper/lower gate drivers or dual ADC clock/data lines.

Pinout & Package

SI8423BD-D-IS is housed in a RoHS-compliant SOIC-16 wide-body package (WB SOIC-16), providing 8.3 mm creepage and clearance for reinforced 5 kV_RMS isolation. Pin numbering follows standard SOIC-16 convention with pins 1–8 on one side (VDD1, GND1, IN1, IN2, NC, NC, NC, NC) and pins 9–16 on the other (VDD2, GND2, OUT1, OUT2, NC, NC, NC, NC).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	VDD1, GND1, IN1, IN2	Input-side power, ground, and two digital inputs - accepts 2.7–5.5 V logic; Schmitt-triggered for noise immunity.
5–8	No Connect	Internally unconnected; may be left floating, tied to VDD1, or grounded per layout needs.
9, 10, 11, 12	VDD2, GND2, OUT1, OUT2	Output-side power, ground, and two isolated outputs - drives 50 Ω loads directly; VOH ≥ VDD2 – 0.4 V at 4 mA.
13–16	No Connect	Internally unconnected; no internal connection; no electrical function.

Key Features

Feature	Design Value
RF-based isolation architecture	Eliminates startup delay and reference clock dependency-output follows input within 40 µs of VDD stabilization.
Selectably high fail-safe output	Ensures OUT1/OUT2 remain logic-high during VDD1 brownout-critical for enabling isolated IGBT/SiC gate drivers safely.
Ultra-low power at 100 Mbps	Consumes <9.2 mA per side at 2.7 V / 100 Mbps-reduces thermal load in dense PCB layouts and extends battery life in portable medical devices.
Precise channel-to-channel timing	0.5 ns max skew enables synchronized sampling of dual isolated current sensors in motor phase-leg monitoring.
AEC-Q100 qualified	Rated for automotive-grade reliability (Grade 1: –40°C to +125°C), supporting use in EV traction inverter auxiliary systems.

Applications

Industrial Motor Control	Isolated Switch-Mode Power Supply
Use Scenario: Isolating PWM enable signals and fault feedback between MCU and half-bridge gate driver ICs in servo drives. IC Role / Device Role / Timing Role: Dual-channel unidirectional isolator delivering timing-coherent gate enable and overcurrent latch signals across 5 kV barrier. Use Value: 0.5 ns channel skew and 11 ns max propagation delay preserve dead-time integrity; 45 kV/µs CMTI prevents false triggering during IGBT switching.	Use Scenario: Providing isolated feedback for voltage regulation and primary-side sensing in 1–3 kW telecom rectifiers. IC Role / Device Role / Timing Role: Transmitting isolated error amplifier output and synchronous rectifier timing signals across reinforced barrier. Use Value: Fail-safe high output ensures regulation loop remains active during controller reset; 150 Mbps supports fast transient response in digital controllers.
Medical Imaging Power Systems	Hybrid Electric Vehicle Battery Management
Use Scenario: Isolating ADC clock and data lines between isolated high-voltage X-ray generator front-end and low-voltage digital processing unit. IC Role / Device Role / Timing Role: Dual-channel isolator preserving sub-ns timing alignment between sampling clock and digitized sensor data. Use Value: 1.5 ns pulse width distortion and 350 ps eye jitter maintain SNR in 16-bit+ medical ADC interfaces compliant with IEC 60601-1.	Use Scenario: Isolating cell voltage monitor (CVM) communication and pack contactor control signals in 400–800 V battery packs. IC Role / Device Role / Timing Role: Transmitting isolated UART commands and safety interlock status across reinforced 5 kV barrier in BMS main board. Use Value: AEC-Q100 qualification and –40°C to +125°C operation ensure reliability in under-hood battery enclosures; 2.7 V min supply supports low-power sleep modes.

Industrial Motor Control

Isolated Switch-Mode Power Supply

Use Scenario: Isolating PWM enable signals and fault feedback between MCU and half-bridge gate driver ICs in servo drives.

IC Role / Device Role / Timing Role: Dual-channel unidirectional isolator delivering timing-coherent gate enable and overcurrent latch signals across 5 kV barrier.

Use Value: 0.5 ns channel skew and 11 ns max propagation delay preserve dead-time integrity; 45 kV/µs CMTI prevents false triggering during IGBT switching.

Use Scenario: Providing isolated feedback for voltage regulation and primary-side sensing in 1–3 kW telecom rectifiers.

IC Role / Device Role / Timing Role: Transmitting isolated error amplifier output and synchronous rectifier timing signals across reinforced barrier.

Use Value: Fail-safe high output ensures regulation loop remains active during controller reset; 150 Mbps supports fast transient response in digital controllers.

Medical Imaging Power Systems

Hybrid Electric Vehicle Battery Management

Use Scenario: Isolating ADC clock and data lines between isolated high-voltage X-ray generator front-end and low-voltage digital processing unit.

IC Role / Device Role / Timing Role: Dual-channel isolator preserving sub-ns timing alignment between sampling clock and digitized sensor data.

Use Value: 1.5 ns pulse width distortion and 350 ps eye jitter maintain SNR in 16-bit+ medical ADC interfaces compliant with IEC 60601-1.

Use Scenario: Isolating cell voltage monitor (CVM) communication and pack contactor control signals in 400–800 V battery packs.

IC Role / Device Role / Timing Role: Transmitting isolated UART commands and safety interlock status across reinforced 5 kV barrier in BMS main board.

Use Value: AEC-Q100 qualification and –40°C to +125°C operation ensure reliability in under-hood battery enclosures; 2.7 V min supply supports low-power sleep modes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM121N1BRZ-RL7	2.5 kV_RMS isolation, 150 Mbps, SOIC-8 narrow body, default-low fail-safe	Limited to basic insulation; unsuitable for IEC 60601-1 medical or reinforced 5 kV industrial systems	Select only where lower isolation rating and smaller footprint are acceptable and fail-safe low is required.
ISO7721FDWR	5 kV_RMS, 100 Mbps, SOIC-8, 2.25–5.5 V supply, default-high fail-safe	Lower data rate limits high-speed SPI or fast PWM; SOIC-8 has reduced creepage vs. WB SOIC-16	Choose when cost and board space are prioritized over 150 Mbps performance and maximum creepage compliance.

Compared with ADUM121N1BRZ-RL7 and ISO7721FDWR, SI8423BD-D-IS uniquely combines 5 kV reinforced isolation, 150 Mbps speed, SOIC-16 wide-body creepage, and guaranteed high-fail-safe behavior-making it the only option qualified for safety-critical motor control and medical power applications requiring all four attributes.

Availability

SI8423BD-D-IS is available at Aetrix Electronics and suitable for industrial motor control, medical imaging power systems, hybrid electric vehicle battery management, and isolated switch-mode power supplies requiring stable component supply, long-term lifecycle assurance, and certified 5 kV reinforced isolation.

Supply support for SI8423BD-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 semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.

The SI84xx family was engineered to replace optocouplers in high-reliability, high-speed isolation applications-delivering superior timing precision, ultra-low power, and AEC-Q100 qualification across industrial, medical, and automotive end markets.

FAQ

What is the isolation voltage rating and certification status of SI8423BD-D-IS?

The SI8423BD-D-IS is rated for 5000 V_RMS isolation for 1 minute and certified to UL 1577, CSA Component Notice 5A, VDE IEC 60747-5-5 (VDE 0884-10), and IEC 60950-1/61010-1/60601-1 for reinforced insulation. These certifications validate its suitability for safety-critical applications including medical equipment and industrial drives where galvanic separation must withstand sustained high voltage stress.

Does SI8423BD-D-IS require external components for stable operation?

Yes, SI8423BD-D-IS requires a 0.1 µF ceramic bypass capacitor placed between each VDD pin and its corresponding GND pin (VDD1–GND1 and VDD2–GND2), located as close as possible to the device. For noisy environments, Skyworks recommends adding 1 µF bulk capacitors and 100 Ω series resistors on input/output lines-per Section 4.3.1 of the official SI8423BD-D-IS datasheet.

What is the meaning of "BD" in SI8423BD-D-IS and how does it affect functionality?

The "BD" in SI8423BD-D-IS denotes the high-speed (150 Mbps) variant with default-high fail-safe output mode. Per Skyworks' Ordering Guide, "B" indicates 150 Mbps data rate and "D" specifies high-fail-safe behavior-ensuring OUT1 and OUT2 remain logic-high when VDD1 is unpowered but VDD2 is active. This differs from "AD" (1 Mbps, high-fail-safe) and "BB" (150 Mbps, unspecified default).

Can SI8423BD-D-IS operate with different supply voltages on each side?

Yes, SI8423BD-D-IS supports independent VDD1 and VDD2 supplies ranging from 2.7 V to 5.5 V each. This allows interfacing a 3.3 V microcontroller (VDD1 side) with a 5 V isolated ADC or gate driver (VDD2 side) without external level shifters. Both sides feature independent UVLO monitors, ensuring correct fail-safe behavior regardless of asymmetric supply sequencing.

How does the RF-based isolation architecture of SI8423BD-D-IS improve reliability versus optocouplers?

The SI8423BD-D-IS uses RF modulation across a silicon-dioxide isolation barrier instead of LED-photodiode coupling. This eliminates LED aging, temperature-dependent CTR drift, and slow turn-on/turn-off delays. As a result, SI8423BD-D-IS guarantees stable propagation delay (<11 ns), lifetime data rate consistency, and >100-year isolation barrier lifetime-unlike optocouplers whose performance degrades after 10–15 years under continuous operation.

SI8423BD-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:: 150Mbps

Propagation Delay tpLH / tpHL (Max):: 11ns, 11ns

Pulse Width Distortion (Max):: 3ns

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

SI8423BD-D-IS FAQ

1.How can I place an order for SI8423BD-D-IS through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8423BD-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 SI8423BD-D-IS reliable?

The price and inventory of SI8423BD-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 SI8423BD-D-IS is usually 5 days.

3.What payment methods are accepted for SI8423BD-D-IS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8423BD-D-IS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8423BD-D-IS?

SI8423BD-D-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8423BD-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 SI8423BD-D-IS?

For technical support, including SI8423BD-D-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8423BD-D-IS requirements.

6.How does Aetrix verify that SI8423BD-D-IS is sourced from the original manufacturer or authorized distributors?

All SI8423BD-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 SI8423BD-D-IS meets industry standards.

7.What is the process for return or replacement of SI8423BD-D-IS?

All SI8423BD-D-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8423BD-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 SI8423BD-D-IS part is unused and in its original packaging.

Return procedure for SI8423BD-D-IS:

1.Submit a request within 90 days.

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

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