SI8445BB-C-IS1R Digital Isolator Equivalent & Substitute Parts

Part Overview

The SI8445BB-C-IS1R is a general purpose digital isolator manufactured by Skyworks Solutions Inc., featuring 2500Vrms isolation across 4 channels with capacitive coupling technology. This active product operates at data rates up to 150Mbps with a common mode transient immunity of 25kV/µs (typical) and is packaged in a 16-SOIC surface mount configuration. Alternative models become necessary when addressing specific application requirements such as extended temperature ranges, enhanced CMTI performance, different packaging formats, or supply chain availability constraints.

Substiute Parts

SI8445BB-C-IS1R

Skyworks Solutions Inc.In Stock: 913SI8445BB-C-IS1R Datasheet

Current PartRFQ

HCPL-090J-000E

Broadcom LimitedIn Stock: 2403HCPL-090J-000E Datasheet

SimilarRFQ

IL 715-3

NVE Corp/Isolation ProductsIn Stock: 5700IL 715-3 Datasheet

SimilarRFQ

IL 715-3E

NVE Corp/Isolation ProductsIn Stock: 8866IL 715-3E Datasheet

SimilarRFQ

IL 715T-3E

NVE Corp/Isolation ProductsIn Stock: 967IL 715T-3E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI8445BB-C-IS1R is determined by the following critical parameters:

• Isolation Voltage: 2500Vrms (all substitutes must match)
• Number of Channels: 4 unidirectional channels (all substitutes must match)
• Package Type: 16-SOIC (0.154", 3.90mm Width) surface mount (all substitutes must match)
• Channel Configuration: 4 inputs on Side 1, 0 inputs on Side 2 (all substitutes must match)
• Supply Voltage Range: Minimum 2.7V required; substitutes with 3V minimum are acceptable
• Operating Temperature Range: -40°C minimum required; extended ranges acceptable
• Data Rate: 150Mbps baseline; substitutes with 110Mbps or higher acceptable
• Common Mode Transient Immunity: 25kV/µs baseline; higher values acceptable

The following parts meet these substitution criteria: HCPL-090J-000E, IL 715-3, IL 715-3E, and IL 715T-3E.

Parameter Comparison

Engineering Selection Recommendations

HCPL-090J-000E (Broadcom Limited): This substitute offers ROHS3 compliance and an extended operating temperature range of -55°C to 125°C. The GMR technology provides lower CMTI (15kV/µs) compared to the SI8445BB-C-IS1R, resulting in reduced propagation delay performance. Suitable for applications requiring enhanced temperature coverage and regulatory compliance. Packaging is supplied in tube format rather than tape and reel.

IL 715-3 (NVE Corp/Isolation Products): This IsoLoop® series part delivers superior CMTI performance at 100kV/µs and maintains the -40°C to 100°C operating range. RoHS non-compliant status may restrict use in regulated applications. Tube packaging format applies. Appropriate for high-speed transient immunity requirements where regulatory compliance is not a constraint.

IL 715-3E (NVE Corp/Isolation Products): This variant provides ROHS3 compliance with identical electrical performance to IL 715-3, including 100kV/µs CMTI. Operating temperature range remains -40°C to 100°C. Tube packaging format applies. Recommended for applications requiring both superior CMTI performance and RoHS3 compliance.

IL 715T-3E (NVE Corp/Isolation Products): This IsoLoop® series part combines ROHS3 compliance with the full -40°C to 125°C operating temperature range matching the SI8445BB-C-IS1R. CMTI performance reaches 100kV/µs. Tube packaging format applies. Optimal selection when matching both temperature range and regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SI8445BB-C-IS1R with any of these parts in my existing design?

A: All listed substitutes share the same 16-SOIC package footprint, 2500Vrms isolation voltage, 4-channel configuration, and unidirectional channel topology. Pin-level compatibility exists. However, verify that your application tolerates the reduced data rate (110Mbps vs. 150Mbps) and confirm supply voltage compatibility, as substitutes require minimum 3V versus the SI8445BB-C-IS1R's 2.7V minimum.

Q: What are the key differences in performance between these parts?

A: The SI8445BB-C-IS1R achieves faster propagation delay (9.5ns) and lower pulse width distortion (2.5ns) due to capacitive coupling technology. Substitute parts using GMR technology exhibit longer propagation delays (15ns) but offer superior CMTI performance (100kV/µs for NVE parts versus 25kV/µs for the SI8445BB-C-IS1R). HCPL-090J-000E provides intermediate CMTI at 15kV/µs.

Q: Does packaging format affect my selection?

A: The SI8445BB-C-IS1R is supplied in tape and reel format suitable for automated assembly. All substitute parts are supplied in tube format, requiring different handling and assembly processes. Confirm your manufacturing process accommodates tube packaging before selection.

Q: Which substitute offers the best compliance profile?

A: IL 715T-3E and IL 715-3E both provide ROHS3 compliance. IL 715T-3E additionally matches the full -40°C to 125°C operating temperature range of the SI8445BB-C-IS1R. HCPL-090J-000E also provides ROHS3 compliance with extended temperature coverage to -55°C. IL 715-3 is RoHS non-compliant and unsuitable for regulated applications.

Q: What supply voltage considerations apply to substitution?

A: The SI8445BB-C-IS1R operates from 2.7V minimum. All substitute parts require 3V minimum supply voltage. Applications operating below 3V cannot use these substitutes without circuit redesign.

Q: Which substitute provides the highest common mode transient immunity?

A: The three NVE IsoLoop® parts (IL 715-3, IL 715-3E, IL 715T-3E) all deliver 100kV/µs CMTI, significantly exceeding the SI8445BB-C-IS1R's 25kV/µs specification. HCPL-090J-000E provides 15kV/µs CMTI.