SI8442AB-D-IS Equivalent & Substitute Parts

Part Overview

The SI8442AB-D-IS is a general purpose digital isolator manufactured by Skyworks Solutions Inc., featuring 2500Vrms isolation voltage, 4 channels, and 1Mbps data rate in a 16-SOIC package. This device is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for ongoing production support, design updates, or when inventory becomes unavailable. Substitute parts must maintain compatibility with the 16-SOIC form factor and support the same isolation voltage class or higher, while accommodating differences in data rate, propagation delay, and supply voltage ranges.

Key Parameters

Parameter	SI8442AB-D-IS
Manufacturer	Skyworks Solutions Inc.
Number of Channels	4
Voltage - Isolation	2500Vrms
Data Rate	1Mbps
Common Mode Transient Immunity (Min)	25kV/µs (Typ)
Voltage - Supply	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package / Case	16-SOIC (0.295", 7.50mm Width)
Technology	Capacitive Coupling
Channel Type	Unidirectional
Inputs - Side 1/Side 2	2/2
Product Status	Not For New Designs
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution logic for the SI8442AB-D-IS is based on the following critical parameters:

Primary Compatibility Criteria:

Package / Case: 16-SOIC (0.295", 7.50mm Width) — all substitutes must use identical package
Number of Channels: 4 channels required
Channel Configuration: 2/2 input distribution (2 inputs on Side 1, 2 inputs on Side 2)
Channel Type: Unidirectional
Voltage - Isolation: 2500Vrms minimum (equal or higher isolation voltage acceptable)
Technology: Capacitive Coupling

Secondary Compatibility Criteria:

Operating Temperature: -40°C ~ 125°C (substitutes must cover this range)
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Substitutes are grouped into two categories:

Parametric Equivalents — Parts with identical channel count (4), identical input distribution (2/2), and identical isolation voltage (2500Vrms), differing only in manufacturer or minor performance characteristics.

Similar Parts — Parts with identical channel count (4), identical input distribution (2/2), but higher isolation voltage (3000Vrms or 5700Vrms) or enhanced data rate performance. These provide superior electrical isolation and performance headroom while maintaining form factor and channel compatibility.

Parameter Comparison

Part Number	Manufacturer	Channels	Inputs (1/2)	Isolation Voltage	Data Rate	CMTI (Min)	Supply Voltage	Temp Range	Package	Product Status
SI8442AB-D-IS	Skyworks	4	2/2	2500Vrms	1Mbps	25kV/µs	2.7V ~ 5.5V	-40°C ~ 125°C	16-SOIC	Not For New Designs
SI8431AB-D-IS	Skyworks	3	2/1	2500Vrms	1Mbps	25kV/µs	2.7V ~ 5.5V	-40°C ~ 125°C	16-SOIC	Not For New Designs
ISO7342CQDWQ1	Texas Instruments	4	2/2	3000Vrms	25Mbps	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	16-SOIC	Active
ISO7342CQDWRQ1	Texas Instruments	4	2/2	3000Vrms	25Mbps	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	16-SOIC	Active
ISO7342FCDW	Texas Instruments	4	2/2	3000Vrms	25Mbps	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	16-SOIC	Active
ISO7342FCDWR	Texas Instruments	4	2/2	3000Vrms	25Mbps	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	16-SOIC	Active
ISO7342FCQDWQ1	Texas Instruments	4	2/2	3000Vrms	25Mbps	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	16-SOIC	Active
ISO7342FCQDWRQ1	Texas Instruments	4	2/2	3000Vrms	25Mbps	25kV/µs	3V ~ 5.5V	-40°C ~ 125°C	16-SOIC	Active
ISO7842DW	Texas Instruments	4	2/2	5700Vrms	100Mbps	100kV/µs	2.25V ~ 5.5V	-55°C ~ 125°C	16-SOIC	Active
ISO7842DWR	Texas Instruments	4	2/2	5700Vrms	100Mbps	100kV/µs	2.25V ~ 5.5V	-55°C ~ 125°C	16-SOIC	Active
MAX14932AAWE+	Analog Devices Inc./Maxim	4	2/2	2750Vrms	1Mbps	25kV/µs	1.71V ~ 5.5V	-40°C ~ 125°C	16-SOIC	Active

Engineering Selection Recommendations

For Direct Replacement (Same Performance Profile):

The MAX14932AAWE+ from Analog Devices Inc./Maxim Integrated is the primary active substitute for the SI8442AB-D-IS. Both devices maintain 4-channel configuration with 2/2 input distribution, 1Mbps data rate, and 25kV/µs CMTI. The MAX14932AAWE+ offers 2750Vrms isolation (higher than the 2500Vrms of the SI8442AB-D-IS), wider supply voltage range (1.71V ~ 5.5V), and Active product status, making it suitable for new designs. The 16-SOIC package is identical, and RoHS3 compliance is maintained.

For Enhanced Performance (Higher Isolation or Data Rate):

The Texas Instruments ISO7342 series (ISO7342CQDWQ1, ISO7342CQDWRQ1, ISO7342FCDW, ISO7342FCDWR, ISO7342FCQDWQ1, ISO7342FCQDWRQ1) provides 3000Vrms isolation with 25Mbps data rate, representing a 25× improvement in bandwidth. These parts are Active products with AEC-Q100 automotive qualification (where applicable), identical 4-channel/2-2 configuration, and 16-SOIC packaging. Selection among these variants depends on packaging preference (Tube vs. Cut Tape & Digi-Reel®) and automotive qualification requirements.

For Maximum Isolation and Speed:

The Texas Instruments ISO7842 series (ISO7842DW, ISO7842DWR) delivers 5700Vrms isolation with 100Mbps data rate and 100kV/µs CMTI, providing the highest performance envelope. These are Active products suitable for demanding applications requiring superior noise immunity and high-speed signal transmission. Extended operating temperature range (-55°C ~ 125°C) and lower minimum supply voltage (2.25V) offer additional design flexibility.

Product Status Consideration:

The SI8442AB-D-IS is marked "Not For New Designs." All recommended substitutes carry Active product status, ensuring long-term availability and continued manufacturer support. For new designs or production continuity, selection from the Active substitute list is strongly indicated.

Frequently Asked Questions (FAQ)

Q: Can the SI8431AB-D-IS (3-channel variant) replace the SI8442AB-D-IS (4-channel)?

A: No. The SI8431AB-D-IS has only 3 channels with 2/1 input distribution, whereas the SI8442AB-D-IS requires 4 channels with 2/2 distribution. Channel count and input configuration are non-negotiable substitution parameters. The SI8431AB-D-IS is suitable only if your application requires exactly 3 channels.

Q: What is the difference between ISO7342CQDWQ1 and ISO7342FCQDWQ1?

A: Both parts are identical in electrical specifications (4 channels, 3000Vrms isolation, 25Mbps data rate, 16-SOIC package). The difference lies in qualification: ISO7342FCQDWQ1 includes AEC-Q100 automotive qualification, while ISO7342CQDWQ1 does not. Select the automotive-qualified variant (F-suffix) if your application requires automotive-grade components.

Q: Can I use ISO7842DW instead of SI8442AB-D-IS in a 1Mbps application?

A: Yes, electrically. The ISO7842DW supports 100Mbps, so 1Mbps operation is well within its capability. However, verify that the higher isolation voltage (5700Vrms vs. 2500Vrms), faster propagation delay (16ns vs. 35ns), and different supply voltage range (2.25V ~ 5.5V vs. 2.7V ~ 5.5V) do not introduce timing or power supply compatibility issues in your circuit. The ISO7842DW is a performance upgrade, not a direct replacement.

Q: What does "Tube" vs. "Cut Tape & Digi-Reel®" packaging mean?

A: Tube packaging is used for lower-volume orders and manual assembly. Cut Tape & Digi-Reel® packaging is used for automated pick-and-place assembly and higher-volume production. Both contain identical components; the difference is in delivery format and handling method. Select based on your assembly process requirements.

Q: Is the MAX14932AAWE+ a direct drop-in replacement?

A: Yes, for most applications. The MAX14932AAWE+ matches the SI8442AB-D-IS in channel count (4), input distribution (2/2), data rate (1Mbps), CMTI (25kV/µs), operating temperature range (-40°C ~ 125°C), and 16-SOIC package. The higher isolation voltage (2750Vrms) and wider supply range (1.71V ~ 5.5V) are backward-compatible advantages. Verify pinout compatibility with your PCB layout before final selection.

Q: Why are some substitutes marked "Active" while the original is "Not For New Designs"?

A: "Not For New Designs" indicates the SI8442AB-D-IS has reached end-of-life and is no longer recommended for new product development. "Active" status means the substitute part is in full production, supported by the manufacturer, and recommended for new designs. For production continuity or design updates, Active substitutes ensure long-term availability and manufacturer support.

Q: Do all substitutes maintain ROHS3 compliance?

A: Yes. All listed substitutes are ROHS3 compliant, matching the environmental compliance of the SI8442AB-D-IS. Compliance status is maintained across all recommended alternatives.

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