SI8622ET-AS Digital Isolator Equivalent & Substitute Parts

Part Overview

The SI8622ET-AS is an automotive-grade general purpose digital isolator manufactured by Skyworks Solutions Inc. This component provides galvanic isolation using capacitive coupling technology, rated for 5000Vrms isolation voltage across 2 channels with 150Mbps data rate capability. The device is qualified to AEC-Q100 automotive standards and operates across the extended temperature range of -40°C to 125°C.

The SI8622ET-AS is currently in active production status. Equivalent substitute parts are available within the SI8622 product family, offering identical or compatible electrical and mechanical specifications for applications requiring component alternatives due to inventory availability, supply chain considerations, or specific moisture sensitivity requirements.

Substiute Parts

SI8622ET-AS2

Skyworks Solutions Inc.In Stock: 743SI8622ET-AS2 Datasheet

Current PartRFQ

SI8622BD-AS

Skyworks Solutions Inc.In Stock: 1930SI8622BD-AS Datasheet

Parametric EquivalentRFQ

SI8622ED-AS

Skyworks Solutions Inc.In Stock: 1731SI8622ED-AS Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI8622ET-AS is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Isolation voltage: 5000Vrms
• Number of channels: 2
• Channel configuration: 1 input per side, unidirectional
• Data rate: 150Mbps
• Propagation delay: 13ns maximum (both directions)
• Pulse width distortion: 4.5ns maximum
• Supply voltage range: 2.5V to 5.5V
• Operating temperature range: -40°C to 125°C
• Package: 16-SOIC (0.295", 7.50mm Width)
• Automotive qualification: AEC-Q100
• Technology: Capacitive coupling

Variable Parameters (Non-Critical for Substitution):

• Common Mode Transient Immunity: The SI8622ET-AS specifies 60kV/µs minimum, while substitute parts SI8622BD-AS and SI8622ED-AS specify 35kV/µs minimum. This represents a performance difference in the main part's favor.
• Moisture Sensitivity Level (MSL): SI8622ET-AS is MSL 3 (168 Hours); substitutes are MSL 2A (4 Weeks). This affects storage and handling requirements.

Both substitute parts maintain full electrical and mechanical compatibility with the SI8622ET-AS across all mandatory parameters, enabling direct functional substitution in automotive digital isolation applications.

Parameter Comparison

Engineering Selection Recommendations

SI8622ET-AS (Primary Part)

The SI8622ET-AS is the primary specification with the highest common mode transient immunity rating of 60kV/µs. This enhanced CMTI performance provides superior noise immunity in high-speed switching environments. The MSL 3 rating allows extended storage periods of up to 168 hours before moisture absorption becomes a concern. This part is recommended for applications where maximum transient immunity is required or where extended component storage is necessary prior to assembly.

SI8622BD-AS and SI8622ED-AS (Substitute Parts)

Both SI8622BD-AS and SI8622ED-AS are functionally equivalent substitutes with identical electrical performance across all critical parameters except CMTI, which is rated at 35kV/µs. These parts maintain full AEC-Q100 automotive qualification and active production status. The reduced CMTI specification does not affect applications operating within normal automotive EMI environments. Both substitutes feature MSL 2A ratings, requiring moisture control measures for storage periods exceeding 4 weeks. These parts are suitable for direct substitution where inventory availability or supply chain requirements necessitate component alternatives.

All three parts are manufactured by Skyworks Solutions Inc., share the identical 16-SOIC package, and maintain compatibility across all mandatory electrical and mechanical specifications for automotive digital isolation applications.

Frequently Asked Questions (FAQ)

Q: Can SI8622BD-AS or SI8622ED-AS be used as direct replacements for SI8622ET-AS in automotive applications?

A: Yes. Both substitute parts maintain identical electrical performance across all critical parameters including isolation voltage (5000Vrms), channel count (2), data rate (150Mbps), propagation delay (13ns), supply voltage range (2.5V to 5.5V), operating temperature range (-40°C to 125°C), and package type (16-SOIC). Both are AEC-Q100 qualified for automotive use. The primary difference is the CMTI specification (35kV/µs versus 60kV/µs), which does not affect functionality in standard automotive EMI environments.

Q: What is the significance of the CMTI difference between SI8622ET-AS and the substitute parts?

A: Common Mode Transient Immunity (CMTI) measures the isolator's ability to maintain signal integrity during rapid voltage changes across the isolation barrier. The SI8622ET-AS specifies 60kV/µs, while SI8622BD-AS and SI8622ED-AS specify 35kV/µs. Both ratings are sufficient for automotive applications. The higher CMTI of the SI8622ET-AS provides additional margin in high-noise environments with extremely fast switching transients.

Q: Are there packaging differences between these parts?

A: No. All three parts use identical 16-SOIC (0.295", 7.50mm Width) surface mount packaging. PCB layout, footprint, and assembly processes are identical across all three part numbers.

Q: What is the difference between MSL 3 and MSL 2A ratings?

A: MSL (Moisture Sensitivity Level) indicates how long a component can be stored in standard conditions before moisture absorption requires baking. SI8622ET-AS (MSL 3) allows 168 hours of storage. SI8622BD-AS and SI8622ED-AS (MSL 2A) allow 4 weeks of storage. After these periods, components must be baked according to IPC standards before assembly. For applications with extended component storage, SI8622ET-AS is preferred.

Q: Are all three parts currently in production?

A: Yes. SI8622ET-AS, SI8622BD-AS, and SI8622ED-AS are all listed as active products from Skyworks Solutions Inc. Current inventory levels are: SI8622ET-AS (708 pcs), SI8622BD-AS (1883 pcs), and SI8622ED-AS (1699 pcs).

Q: Can these parts be used interchangeably in the same design without PCB modifications?

A: Yes. All three parts share identical pinouts, package dimensions, and electrical interfaces. No PCB layout changes are required for substitution.