SI8442AB-C-IS1R Equivalent & Substitute Parts

Part Overview

The SI8442AB-C-IS1R is a general purpose digital isolator manufactured by Skyworks Solutions Inc., featuring 2500Vrms isolation, 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, legacy system maintenance, and design continuity where isolation requirements must be met with actively supported alternatives.

Key Parameters

Parameter	SI8442AB-C-IS1R
Manufacturer	Skyworks Solutions Inc.
Voltage - Isolation	2500Vrms
Number of Channels	4
Channel Type	Unidirectional
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 (0.154", 3.90mm Width)
Technology	Capacitive Coupling
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Package compatibility: All substitutes must use 16-SOIC (0.154", 3.90mm Width) form factor for direct PCB replacement
Isolation voltage: Minimum 2500Vrms required; higher isolation ratings (2750Vrms) are acceptable as they exceed the original specification
Channel configuration: 4 channels, unidirectional, with 2/2 input distribution on each side
Technology: Capacitive coupling isolation technology
Operating temperature range: -40°C to 125°C minimum
Supply voltage compatibility: Overlapping or extended supply voltage ranges acceptable

Substitutes are grouped by data rate capability and product status. The SI8642AB-B-IS1R maintains the original 1Mbps specification with improved CMTI performance. The MAX14932 family offers multiple data rate variants (1Mbps, 25Mbps, 150Mbps) with higher isolation voltage and active product status, providing forward compatibility for new designs while maintaining pin-compatible 16-SOIC packaging.

Parameter Comparison

Parameter	SI8442AB-C-IS1R	SI8642AB-B-IS1R	MAX14932AASE+	MAX14932BASE+	MAX14932CASE+	MAX14932DASE+	MAX14932EASE+
Manufacturer	Skyworks	Skyworks	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices
Voltage - Isolation	2500Vrms	2500Vrms	2750Vrms	2750Vrms	2750Vrms	2750Vrms	2750Vrms
Number of Channels	4	4	4	4	4	4	4
Data Rate	1Mbps	1Mbps	1Mbps	25Mbps	150Mbps	1Mbps	25Mbps
CMTI (Min)	25kV/µs	35kV/µs	25kV/µs	25kV/µs	25kV/µs	25kV/µs	25kV/µs
Propagation Delay tpLH (Max)	35ns	35ns	54.1ns	27.5ns	7.5ns	54.1ns	27.5ns
Propagation Delay tpHL (Max)	35ns	35ns	55.3ns	28.8ns	7.4ns	55.3ns	28.8ns
Voltage - Supply	2.7V ~ 5.5V	2.5V ~ 5.5V	1.71V ~ 5.5V	1.71V ~ 5.5V	1.71V ~ 5.5V	1.71V ~ 5.5V	1.71V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	2 (1 Year)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For direct replacement with minimal design changes: SI8642AB-B-IS1R is the primary substitute. It maintains Skyworks manufacturing, identical 1Mbps data rate, and 16-SOIC packaging. The device offers improved CMTI performance (35kV/µs vs. 25kV/µs) and active product status, making it suitable for ongoing production. Supply voltage range is slightly reduced (2.5V minimum vs. 2.7V), which must be verified against system requirements.

For applications requiring higher performance or extended supply voltage: MAX14932 variants from Analog Devices provide multiple data rate options while maintaining 16-SOIC compatibility and higher isolation voltage (2750Vrms). All MAX14932 variants carry active product status, ROHS3 compliance, and superior MSL ratings (1 vs. 2). Selection among MAX14932 variants depends on required data rate: MAX14932AASE+/MAX14932DASE+ for 1Mbps applications, MAX14932BASE+/MAX14932EASE+ for 25Mbps, and MAX14932CASE+ for 150Mbps high-speed isolation requirements.

Compliance considerations: All active substitutes are ROHS3 compliant and REACH unaffected. The SI8442AB-C-IS1R "Not For New Designs" status necessitates transition to an actively supported alternative for long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can SI8642AB-B-IS1R directly replace SI8442AB-C-IS1R on existing PCBs? A: Yes. Both devices use identical 16-SOIC (0.154", 3.90mm Width) packaging and pin configuration. Verify that your system's minimum supply voltage requirement does not fall below 2.5V, as SI8642AB-B-IS1R has a 2.5V minimum compared to 2.7V for the original part.

Q: What is the key difference between SI8642AB-B-IS1R and MAX14932 substitutes? A: SI8642AB-B-IS1R maintains the original 1Mbps data rate and Skyworks manufacturing. MAX14932 variants offer higher isolation voltage (2750Vrms vs. 2500Vrms), extended supply voltage range (1.71V minimum), and multiple data rate options (1Mbps, 25Mbps, 150Mbps). All are pin-compatible in 16-SOIC packaging.

Q: Are all substitutes pin-compatible with SI8442AB-C-IS1R? A: Yes. All listed substitutes use 16-SOIC (0.154", 3.90mm Width) packaging with identical pinout for 4-channel unidirectional digital isolation. No PCB layout modifications are required.

Q: Which substitute should I choose for new designs? A: MAX14932CASE+ or MAX14932CASE+T are recommended for new designs requiring high-speed isolation (150Mbps). For 1Mbps applications, MAX14932DASE+ or MAX14932DASE+T provide active product status with extended supply voltage range. All MAX14932 variants offer superior compliance certifications and unlimited MSL ratings.

Q: What is the difference between packaging options (Tube, Tape & Reel, Cut Tape)? A: Packaging affects handling and assembly processes. Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel are suitable for automated pick-and-place assembly. Tube packaging is used for manual assembly or lower-volume applications. Electrical performance is identical across packaging variants of the same part number.

Q: Can I use MAX14932 parts with higher data rates if my application only requires 1Mbps? A: Yes. Higher data rate variants (MAX14932BASE+, MAX14932CASE+, MAX14932EASE+) are backward compatible with 1Mbps applications. They provide additional performance margin and future design flexibility without functional impact on lower-speed systems.

Q: What is the significance of MSL rating differences? A: SI8442AB-C-IS1R and SI8642AB-B-IS1R have MSL 2 (1 Year), requiring moisture bake-out within one year of manufacture. MAX14932 variants have MSL 1 (Unlimited), eliminating moisture sensitivity concerns and simplifying inventory management for long-term storage.

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