SI8441-B-IS Equivalent & Substitute Parts

Part Overview

The SI8441-B-IS is a general purpose digital isolator manufactured by Skyworks Solutions Inc., featuring 2500Vrms isolation across 4 channels with 10Mbps data rate and 25kV/µs common mode transient immunity. The device is packaged in 16-SOIC (0.295", 7.50mm Width) and uses capacitive coupling technology. This part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	SI8441-B-IS
Manufacturer	Skyworks Solutions Inc.
Technology	Capacitive Coupling
Number of Channels	4
Inputs - Side 1/Side 2	3/1
Voltage - Isolation	2500Vrms
Common Mode Transient Immunity (Min)	25kV/µs
Data Rate	10Mbps
Propagation Delay tpLH / tpHL (Max)	35ns / 35ns
Pulse Width Distortion (Max)	7.5ns
Voltage - Supply	2.375V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package / Case	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SI8441-B-IS is determined by the following critical parameters that must be matched or exceeded:

4-channel configuration with 3/1 input distribution (unidirectional)
2500Vrms isolation voltage
25kV/µs common mode transient immunity
10Mbps data rate capability
16-SOIC package form factor
Operating temperature range compatibility (-40°C minimum)
Surface mount technology

The substitute parts identified are from Analog Devices Inc. (iCoupler® series) using magnetic coupling technology instead of capacitive coupling. All substitutes maintain the same channel configuration, isolation voltage, CMTI specification, and package footprint. Substitutes are grouped by data rate performance and temperature grade to facilitate selection based on application requirements.

Parameter Comparison

Parameter	SI8441-B-IS	ADUM1401BRWZ	ADUM1401BRWZ-RL	ADUM1401CRWZ	ADUM1401CRWZ-RL	ADUM1401WTRWZ	ADUM1401WTRWZ-RL
Manufacturer	Skyworks Solutions	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices
Technology	Capacitive Coupling	Magnetic Coupling	Magnetic Coupling	Magnetic Coupling	Magnetic Coupling	Magnetic Coupling	Magnetic Coupling
Number of Channels	4	4	4	4	4	4	4
Inputs - Side 1/Side 2	3/1	3/1	3/1	3/1	3/1	3/1	3/1
Voltage - Isolation	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms
Common Mode Transient Immunity (Min)	25kV/µs	25kV/µs	25kV/µs	25kV/µs	25kV/µs	25kV/µs	25kV/µs
Data Rate	10Mbps	10Mbps	10Mbps	90Mbps	90Mbps	10Mbps	10Mbps
Propagation Delay tpLH / tpHL (Max)	35ns / 35ns	50ns / 50ns	50ns / 50ns	32ns / 32ns	32ns / 32ns	32ns / 32ns	32ns / 32ns
Pulse Width Distortion (Max)	7.5ns	3ns	3ns	2ns	2ns	3ns	3ns
Voltage - Supply	2.375V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	Not specified	Commercial	Commercial	Commercial	Commercial	Automotive	Automotive

Engineering Selection Recommendations

For direct replacement of the obsolete SI8441-B-IS, the ADUM1401BRWZ and ADUM1401BRWZ-RL are primary substitutes. Both maintain the 10Mbps data rate specification and meet all isolation and channel requirements. These parts are active products with ROHS3 compliance and full commercial availability.

For applications requiring extended operating temperature range to 125°C, the ADUM1401WTRWZ and ADUM1401WTRWZ-RL automotive-grade variants are specified. These maintain 10Mbps performance with automotive qualification and MSL 3 moisture sensitivity rating.

For applications where higher data rate performance is beneficial, the ADUM1401CRWZ and ADUM1401CRWZ-RL offer 90Mbps capability with improved propagation delay (32ns) and pulse width distortion (2ns), though operating temperature is limited to 105°C in commercial grade.

Packaging variants are available in Tube (standard) and Cut Tape with Digi-Reel® formats. Selection between these depends on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can ADUM1401 series parts directly replace SI8441-B-IS in existing designs?

A: Yes, the ADUM1401 series maintains identical channel configuration (4 channels, 3/1 input distribution), isolation voltage (2500Vrms), CMTI specification (25kV/µs), and 16-SOIC package footprint. Pin-to-pin compatibility exists for the specified functions. However, verify supply voltage range compatibility; SI8441-B-IS supports 2.375V minimum while ADUM1401 series supports 2.7V minimum.

Q: What is the difference between ADUM1401BRWZ and ADUM1401CRWZ?

A: Both maintain 2500Vrms isolation and 25kV/µs CMTI. The primary difference is data rate: ADUM1401BRWZ operates at 10Mbps with 50ns maximum propagation delay, while ADUM1401CRWZ operates at 90Mbps with 32ns maximum propagation delay. Select based on application bandwidth requirements.

Q: Why do some substitutes have different operating temperature ranges?

A: Commercial-grade ADUM1401 variants (BRWZ, CRWZ) operate to 105°C maximum. Automotive-grade variants (WTRWZ) extend to 125°C and include automotive qualification. Select based on application temperature requirements and qualification standards.

Q: What is the difference between Tube and Cut Tape packaging?

A: Tube packaging (ADUM1401BRWZ) is standard reel packaging. Cut Tape with Digi-Reel® (ADUM1401BRWZ-RL) provides the same component in cut tape format on a reel for automated assembly. Selection depends on assembly equipment and procurement preferences.

Q: Are all substitutes RoHS compliant?

A: Yes, all ADUM1401 series substitutes are ROHS3 compliant. The original SI8441-B-IS RoHS status is not specified in available documentation.

Q: What technology difference exists between SI8441-B-IS and ADUM1401 substitutes?

A: SI8441-B-IS uses capacitive coupling isolation technology, while ADUM1401 series uses magnetic coupling (iCoupler® technology). Both achieve the same 2500Vrms isolation and 25kV/µs CMTI specifications. Magnetic coupling provides equivalent performance with different implementation architecture.

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