SI8642BD-AS2 Equivalent & Substitute Parts

Part Overview

The SI8642BD-AS2 is a general-purpose digital isolator manufactured by Skyworks Solutions Inc., designed for automotive applications requiring galvanic isolation. This 4-channel capacitive coupling isolator operates at 5000Vrms isolation voltage with a maximum common mode transient immunity (CMTI) of 35kV/µs and supports data rates up to 150Mbps. The device is packaged in a 16-SOIC surface-mount package and meets AEC-Q100 automotive qualification standards with an operating temperature range of -40°C to 125°C.

The SI8642BD-AS2 is classified as an active product. Identifying equivalent and substitute parts is necessary for supply chain continuity, inventory optimization, and design flexibility when the primary part number becomes unavailable or when alternative sourcing options are required.

Substiute Parts

SI8642BD-AS2

Skyworks Solutions Inc.In Stock: 763SI8642BD-AS2 Datasheet

Current PartRFQ

SI8642BD-AS

Skyworks Solutions Inc.In Stock: 1434SI8642BD-AS Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI8642BD-AS2 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Manufacturer: Skyworks Solutions Inc.
• Series: Si864x
• Technology: Capacitive Coupling
• Number of Channels: 4
• Channel Configuration: 2 inputs on Side 1, 2 inputs on Side 2
• Channel Type: Unidirectional
• Isolation Voltage: 5000Vrms
• Common Mode Transient Immunity: 35kV/µs minimum
• Data Rate: 150Mbps
• Supply Voltage Range: 2.375V ~ 5.5V
• Package Type: 16-SOIC (0.295", 7.50mm Width)
• Grade: Automotive
• Qualification: AEC-Q100
• Operating Temperature Range: -40°C ~ 125°C
• Mounting Type: Surface Mount

The SI8642BD-AS qualifies as a parametric equivalent to the SI8642BD-AS2 based on identical electrical specifications, isolation characteristics, channel configuration, and automotive qualification status. Both parts belong to the Si864x series and share the same base product number (SI8642), differing only in packaging and moisture sensitivity level specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the SI8642BD-AS2 and SI8642BD-AS are active products from Skyworks Solutions Inc. with full AEC-Q100 automotive qualification. The parts are electrically and functionally identical across all critical isolation, timing, and operational parameters.

The primary distinction between these parts is the moisture sensitivity level (MSL) specification. The SI8642BD-AS2 carries an MSL rating of 3 (168 hours), while the SI8642BD-AS carries an MSL rating of 2A (4 weeks). This difference affects storage and handling requirements prior to assembly but does not impact electrical performance or functional compatibility in the final application.

Selection between these parts should be based on:

1. Supply Chain Availability: The SI8642BD-AS currently maintains higher inventory (1398 pcs) compared to the SI8642BD-AS2 (681 pcs).

2. Moisture Sensitivity Requirements: If the assembly process includes extended storage periods or high-humidity environments, the SI8642BD-AS with its 2A MSL rating provides a longer shelf life window (4 weeks) compared to the SI8642BD-AS2 (168 hours).

3. Packaging Specifications: Both parts are supplied in tube packaging and are suitable for automated assembly processes.

Both parts are suitable for direct substitution in automotive applications requiring 5000Vrms isolation, 4-channel digital isolation, and 150Mbps data rate performance within the -40°C to 125°C operating range.

Frequently Asked Questions (FAQ)

Q: Can the SI8642BD-AS be used as a direct replacement for the SI8642BD-AS2?

A: Yes. The SI8642BD-AS is a parametric equivalent to the SI8642BD-AS2. All electrical specifications, isolation voltage, channel configuration, data rate, timing characteristics, supply voltage range, automotive grade, AEC-Q100 qualification, and operating temperature range are identical. The parts are pin-compatible and functionally interchangeable.

Q: What is the difference between SI8642BD-AS2 and SI8642BD-AS?

A: The primary difference is the moisture sensitivity level (MSL) specification. The SI8642BD-AS2 has an MSL rating of 3 (168 hours), while the SI8642BD-AS has an MSL rating of 2A (4 weeks). This affects the maximum storage duration in non-controlled humidity environments before assembly. All other electrical and mechanical specifications are identical.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the SI8642BD-AS2 and SI8642BD-AS are automotive-grade components with AEC-Q100 qualification. They are designed and tested for automotive operating conditions including the -40°C to 125°C temperature range.

Q: What does the 16-SOIC package specification mean?

A: The 16-SOIC (Small Outline Integrated Circuit) package is a surface-mount package with 16 pins. The specification "0.295", 7.50mm Width" refers to the package body width of 7.50 millimeters. Both parts use this identical package type, ensuring mechanical and electrical compatibility on the same PCB layout.

Q: Can I use these parts interchangeably in my PCB design?

A: Yes. Both parts have identical pin configurations, package dimensions, and electrical specifications. No PCB layout changes or design modifications are required when substituting between the SI8642BD-AS2 and SI8642BD-AS.

Q: What is the significance of the 5000Vrms isolation voltage?

A: The 5000Vrms isolation voltage specification indicates the maximum continuous voltage that can be applied between the isolated sides of the device while maintaining electrical isolation. This rating is critical for safety-critical automotive applications requiring galvanic isolation between different circuit domains.

Q: What does 35kV/µs CMTI mean?

A: Common Mode Transient Immunity (CMTI) of 35kV/µs specifies the maximum rate of change of voltage between the isolated sides that the device can tolerate without introducing errors. This parameter is important in automotive environments with high-speed switching and transient noise.

Q: Are both parts available in the same packaging format?

A: Yes. Both the SI8642BD-AS2 and SI8642BD-AS are supplied in tube packaging, which is standard for automated assembly processes in high-volume production environments.