SI88441BD-IS Digital Isolator Equivalent & Substitute Parts

Part Overview

The SI88441BD-IS is a general purpose digital isolator manufactured by Skyworks Solutions Inc., featuring 5000Vrms isolation voltage, 4 channels, and 100Mbps data rate in a 20-SOIC package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary for ongoing production support, design updates, and long-term supply chain continuity.

Key Parameters

Parameter	SI88441BD-IS
Manufacturer	Skyworks Solutions Inc.
Technology	Capacitive Coupling
Type	General Purpose
Number of Channels	4
Inputs - Side 1/Side 2	3/1
Voltage - Isolation	5000Vrms
Common Mode Transient Immunity (Min)	40kV/µs
Data Rate	100Mbps
Propagation Delay tpLH / tpHL (Max)	18ns / 23ns
Pulse Width Distortion (Max)	7ns
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution for the SI88441BD-IS is determined by the following critical parameters:

Primary Substitution Criteria (4-Channel Configuration):

Number of Channels: 4
Inputs - Side 1/Side 2: 3/1 (unidirectional configuration)
Voltage - Isolation: 5000Vrms
Common Mode Transient Immunity: 40kV/µs
Data Rate: 100Mbps
Package: 20-SOIC (0.295", 7.50mm Width)
Voltage - Supply: 3V ~ 5.5V
Operating Temperature: -40°C ~ 125°C

Direct Equivalents (Same Channel Configuration): Parts SI88441BC-IS and SI88441EC-IS maintain identical electrical specifications and channel configuration. These parts differ only in product status (Active vs. Not For New Designs) and temperature grade designation.

Parametric Equivalents (Reduced Channel Count): Parts SI88320BC-IS, SI88320EC-IS, SI88321BC-IS, and SI88321EC-IS provide 2-channel configurations with identical isolation voltage, CMTI, data rate, and timing specifications. These parts are suitable for applications requiring fewer isolated channels within the same electrical performance envelope.

Parametric Equivalents (4-Channel Alternative): Part SI88620BC-IS and SI88620EC-IS provide 2-channel configurations. Part SI88441EC-IS provides 4-channel configuration matching the original part specifications.

Parameter Comparison

Part Number	Channels	Inputs (1/2)	Isolation (Vrms)	CMTI (kV/µs)	Data Rate (Mbps)	tpLH/tpHL (ns)	PWD (ns)	Supply (V)	Temp (°C)	Package	Status
SI88441BD-IS	4	3/1	5000	40	100	18/23	7	3.0-5.5	-40 to 125	20-SOIC	Not For New Designs
SI88441BC-IS	4	3/1	5000	40	100	18/23	7	3.0-5.5	-40 to 125	20-SOIC	Active
SI88441EC-IS	4	3/1	5000	40	100	18/23	7	3.0-5.5	-40 to 125	20-SOIC	Active
SI88241BC-IS	4	3/1	5000	40	100	18/23	7	3.0-5.5	-40 to 125	20-SOIC	Active
SI88241EC-IS	4	3/1	5000	40	100	18/23	7	3.0-5.5	-40 to 125	20-SOIC	Active
SI88320BC-IS	2	2/0	5000	40	100	18/23	7	3.0-5.5	-40 to 125	20-SOIC	Active
SI88320EC-IS	2	2/0	5000	40	100	18/23	7	3.0-5.5	-40 to 125	20-SOIC	Active
SI88321BC-IS	2	1/1	5000	40	100	18/23	7	3.0-5.5	-40 to 125	20-SOIC	Active
SI88321EC-IS	2	1/1	5000	40	100	18/23	7	3.0-5.5	-40 to 125	20-SOIC	Active
SI88620BC-IS	2	2/0	5000	40	100	18/23	7	3.0-5.5	-40 to 125	20-SOIC	Active
SI88620EC-IS	2	2/0	5000	40	100	18/23	7	3.0-5.5	-40 to 125	20-SOIC	Active

Engineering Selection Recommendations

For Direct Replacement (4-Channel, 3/1 Configuration): SI88441BC-IS and SI88441EC-IS are the primary substitutes for SI88441BD-IS. Both parts maintain identical electrical specifications and channel configuration. SI88441BC-IS and SI88441EC-IS carry Active product status, ensuring continued manufacturing support and availability. Both parts are ROHS3 compliant with MSL 3 rating, matching the original part's compliance profile.

For Channel-Reduced Applications (2-Channel Configurations): When application requirements permit reduction to 2 isolated channels, SI88320BC-IS, SI88320EC-IS, SI88321BC-IS, and SI88321EC-IS provide equivalent electrical performance. SI88320 and SI88620 series support 2/0 input configuration (two inputs on Side 1, none on Side 2). SI88321 series supports 1/1 input configuration (one input on each side). All 2-channel variants maintain 5000Vrms isolation, 40kV/µs CMTI, 100Mbps data rate, and identical timing specifications.

Compliance and Certification: All substitute parts maintain ROHS3 compliance and MSL 3 (168 Hours) moisture sensitivity rating. All parts operate across the -40°C to 125°C temperature range with 3V to 5.5V supply voltage compatibility.

Frequently Asked Questions (FAQ)

Q: Can SI88441BC-IS directly replace SI88441BD-IS in existing designs? A: Yes. SI88441BC-IS provides identical electrical specifications, channel configuration (4 channels, 3/1 input arrangement), isolation voltage (5000Vrms), CMTI (40kV/µs), data rate (100Mbps), and package (20-SOIC). The only difference is product status (Active vs. Not For New Designs). Pin-to-pin compatibility is maintained.

Q: What is the difference between SI88441EC-IS and SI88441BC-IS? A: Both parts are electrically identical with matching specifications and Active product status. The designation difference (BC vs. EC) reflects internal temperature grade or manufacturing process variants within Skyworks' product line, but electrical performance and pinout remain identical.

Q: Can I use a 2-channel part (SI88320, SI88321, SI88620 series) instead of the 4-channel SI88441BD-IS? A: Only if your application requires fewer than 4 isolated channels. The 2-channel variants maintain identical isolation voltage, CMTI, data rate, and timing specifications. However, they provide only 2 channels instead of 4. Verify your circuit design requires no more than 2 isolated channels before substitution.

Q: What is the difference between SI88320 and SI88321 series? A: SI88320 series (SI88320BC-IS, SI88320EC-IS) provides 2/0 input configuration (both inputs on Side 1). SI88321 series (SI88321BC-IS, SI88321EC-IS) provides 1/1 input configuration (one input on each side). Select based on your isolation barrier placement requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 3 (168 Hours) moisture sensitivity rating, matching the original SI88441BD-IS compliance profile.

Q: What is the package compatibility across all substitute parts? A: All substitute parts use the 20-SOIC (0.295", 7.50mm Width) package, ensuring PCB footprint compatibility with the original SI88441BD-IS design.

Q: Why is SI88441BD-IS marked "Not For New Designs"? A: This designation indicates the part has reached end-of-life status. Skyworks recommends SI88441BC-IS or SI88441EC-IS for new designs while maintaining SI88441BD-IS availability for existing production support.

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