SI8621BD-AS Equivalent & Substitute Parts

Part Overview

The SI8621BD-AS is an automotive-grade general purpose digital isolator manufactured by Skyworks Solutions Inc. This 2-channel capacitive coupling isolator provides 5000Vrms isolation with 150Mbps data rate capability and 35kV/µs common mode transient immunity. The device is qualified to AEC-Q100 automotive standards and operates across the -40°C to 125°C temperature range in a 16-SOIC surface mount package.

The SI8621BD-AS maintains active product status with 655 units in current inventory. Substitute parts are identified based on parametric equivalence within the SI862x digital isolator family, enabling component selection flexibility for design requirements, supply chain optimization, or inventory management.

Substiute Parts

SI8621BD-AS

Skyworks Solutions Inc.In Stock: 713SI8621BD-AS 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

Substitute parts for the SI8621BD-AS are identified as parametric equivalents within the Skyworks SI862x digital isolator family. Substitution eligibility is determined by strict equivalence across the following critical parameters:

Substitution Criteria:

• Isolation voltage: 5000Vrms
• Number of channels: 2
• Data rate: 150Mbps
• Common mode transient immunity: 35kV/µs minimum
• Supply voltage range: 2.5V ~ 5.5V
• Operating temperature range: -40°C ~ 125°C
• Package type: 16-SOIC (0.295", 7.50mm Width)
• Technology: Capacitive coupling
• Automotive grade and AEC-Q100 qualification
• Channel configuration: 1 input per side, unidirectional

The SI8622BD-AS and SI8622ED-AS meet all substitution criteria and are classified as parametric equivalents. These parts differ only in base product designation (SI8622 versus SI8621) while maintaining identical electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—SI8621BD-AS, SI8622BD-AS, and SI8622ED-AS—are active products with full AEC-Q100 automotive qualification and identical electrical and mechanical specifications. Selection between these parts is based on the following engineering considerations:

Product Status and Compliance: All substitute parts maintain active product status and meet automotive-grade requirements with AEC-Q100 qualification. No compliance or qualification differences exist between the three options.

Inventory Availability: The SI8622BD-AS (1883 units) and SI8622ED-AS (1699 units) offer significantly higher inventory levels compared to the SI8621BD-AS (655 units). For applications requiring immediate availability or bulk procurement, the SI8622 variants provide supply chain advantages.

Packaging and Handling: All parts are supplied in tube packaging with identical MSL 2A (4 Weeks) moisture sensitivity ratings. No differences in handling, storage, or assembly requirements exist.

Electrical Performance: Propagation delay, pulse width distortion, rise/fall time, and all isolation parameters are identical across all three parts. No performance differentiation exists for signal integrity or timing-critical applications.

Design Integration: Direct pin-for-pin and functional compatibility exists between SI8621BD-AS and both SI8622 variants. PCB layout, schematic integration, and firmware requirements remain unchanged during substitution.

Frequently Asked Questions (FAQ)

Q: Can SI8622BD-AS or SI8622ED-AS be used as direct replacements for SI8621BD-AS?

A: Yes. Both SI8622BD-AS and SI8622ED-AS are parametric equivalents with identical isolation voltage (5000Vrms), channel count (2), data rate (150Mbps), CMTI (35kV/µs), supply voltage range (2.5V ~ 5.5V), operating temperature range (-40°C ~ 125°C), and 16-SOIC package specifications. Pin-for-pin compatibility and functional equivalence are confirmed.

Q: Are there any differences in automotive qualification between these parts?

A: No. All three parts carry identical automotive grade designation and AEC-Q100 qualification. No differences in automotive compliance, reliability testing, or qualification status exist.

Q: What is the difference between SI8621BD-AS and SI8622BD-AS?

A: The parts differ only in base product number designation (SI8621 versus SI8622). All electrical parameters, mechanical specifications, package type, and performance characteristics are identical. The difference is a product line variant within the Skyworks SI862x family.

Q: Can I substitute SI8622ED-AS for SI8622BD-AS?

A: Yes. Both parts are parametric equivalents with identical specifications across all critical parameters including isolation voltage, data rate, CMTI, supply voltage, temperature range, and package type. The difference is a product line variant designation.

Q: Are the propagation delay and timing characteristics identical across all three parts?

A: Yes. Propagation delay tpLH and tpHL are both 13ns maximum, pulse width distortion is 4.5ns maximum, and rise/fall times are 2.5ns typical for all three parts. No timing differences exist.

Q: What is the moisture sensitivity level for these parts?

A: All three parts have MSL 2A (4 Weeks) rating. This indicates the parts must be used within 4 weeks of bag opening under controlled humidity conditions. Identical handling and storage requirements apply to all variants.

Q: Are there inventory or lead time considerations for substitution?

A: SI8622BD-AS (1883 units) and SI8622ED-AS (1699 units) have higher current inventory levels than SI8621BD-AS (655 units). For applications with immediate delivery requirements or large volume needs, the SI8622 variants may offer supply chain advantages.

Q: Can these parts be used interchangeably in automotive applications?

A: Yes. All three parts are automotive-grade with AEC-Q100 qualification and identical operating temperature range (-40°C ~ 125°C). Interchangeability is confirmed for automotive system integration.

Q: What package type is used for all three parts?

A: All three parts use 16-SOIC (0.295", 7.50mm Width) surface mount package. PCB footprint, land pattern, and assembly process requirements are identical across all variants.