SI8405AB-A-IS1R Equivalent & Substitute Parts

Part Overview

The SI8405AB-A-IS1R is a 4-channel I2C digital isolator manufactured by Skyworks Solutions Inc., designed to provide galvanic isolation up to 2500Vrms with capacitive coupling technology. This component operates across a supply voltage range of 3V to 5.5V and supports bidirectional and unidirectional channel configurations in a 16-SOIC surface mount package.

The SI8405AB-A-IS1R carries a product status of Not For New Designs, indicating that Skyworks Solutions has discontinued active development and support for this model. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with active manufacturer support and improved specifications.

Substiute Parts

SI8405AB-A-IS1R

Skyworks Solutions Inc.In Stock: 989SI8405AB-A-IS1R Datasheet

Current PartRFQ

SI8605AB-B-IS1R

Skyworks Solutions Inc.In Stock: 3404SI8605AB-B-IS1R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SI8405AB-A-IS1R must maintain electrical and mechanical compatibility based on the following critical parameters:

Mandatory Matching Parameters:

• Technology: Capacitive Coupling
• Type: I2C Digital Isolator
• Number of Channels: 4
• Voltage - Isolation: 2500Vrms
• Voltage - Supply: 3V ~ 5.5V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Inputs - Side 1/Side 2: 3/3
• Channel Type: Bidirectional, Unidirectional
• Isolated Power: No

Allowable Variation Parameters:

• Common Mode Transient Immunity (Min): May exceed the original 25kV/µs specification, as higher CMTI values provide enhanced performance without compromising compatibility
• Product Status: Active status preferred for new designs and long-term supply assurance

The SI8605AB-B-IS1R qualifies as a direct substitute, meeting all mandatory electrical and mechanical parameters while offering improved Common Mode Transient Immunity of 35kV/µs and active product status.

Parameter Comparison

Engineering Selection Recommendations

The SI8605AB-B-IS1R is the qualified substitute for the SI8405AB-A-IS1R. Selection rationale is based on the following engineering criteria:

Product Status Alignment: The SI8405AB-A-IS1R is designated Not For New Designs, indicating end-of-life status. The SI8605AB-B-IS1R maintains Active product status, ensuring ongoing manufacturer support, availability, and compliance with current industry standards.

Electrical Compatibility: Both components share identical isolation voltage (2500Vrms), supply voltage range (3V ~ 5.5V), operating temperature range (-40°C ~ 125°C), and channel configuration (4 channels, 3/3 inputs). The SI8605AB-B-IS1R provides enhanced Common Mode Transient Immunity (35kV/µs versus 25kV/µs), which represents a performance improvement without introducing compatibility issues.

Mechanical Compatibility: Both parts utilize the same 16-SOIC package footprint (0.154", 3.90mm Width) and surface mount technology, enabling direct PCB layout compatibility without redesign.

Compliance and Certification: Both components share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, maintaining regulatory compliance across supply chain transitions.

Frequently Asked Questions (FAQ)

Q: Can the SI8605AB-B-IS1R be used as a direct replacement for the SI8405AB-A-IS1R on existing PCBs?

A: Yes. Both components share identical package geometry (16-SOIC, 0.154", 3.90mm Width), pin configuration (3/3 inputs), and electrical specifications (2500Vrms isolation, 3V ~ 5.5V supply). The SI8605AB-B-IS1R can be soldered into existing board layouts without modification.

Q: What is the difference between the SI8405AB-A-IS1R and SI8605AB-B-IS1R?

A: The primary difference is Common Mode Transient Immunity: the SI8605AB-B-IS1R provides 35kV/µs compared to the SI8405AB-A-IS1R's 25kV/µs. Additionally, the SI8605AB-B-IS1R maintains Active product status, while the SI8405AB-A-IS1R is Not For New Designs.

Q: Why is the SI8405AB-A-IS1R marked as Not For New Designs?

A: This designation indicates that Skyworks Solutions has transitioned this component to end-of-life status. New designs should utilize the SI8605AB-B-IS1R to ensure long-term supply availability and manufacturer support.

Q: Are there any functional differences in I2C protocol support between these parts?

A: No. Both components are I2C digital isolators with identical channel configuration (4 channels), input structure (3/3), and support for bidirectional and unidirectional channel types.

Q: What is the inventory status of these parts?

A: The SI8405AB-A-IS1R has 931 pieces in stock. The SI8605AB-B-IS1R has 3312 pieces in stock, providing greater supply assurance for ongoing production requirements.