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SI8441AB-C-IS1 Equivalent & Substitute Parts
Part Overview
The SI8441AB-C-IS1 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 flexibility when the primary part becomes unavailable.
Substiute Parts
Key Parameters
| Parameter | SI8441AB-C-IS1 |
|---|---|
| Manufacturer | Skyworks Solutions Inc. |
| Technology | Capacitive Coupling |
| Type | General Purpose |
| Number of Channels | 4 |
| Inputs - Side 1/Side 2 | 3/1 |
| Channel Type | Unidirectional |
| Voltage - Isolation | 2500Vrms |
| Common Mode Transient Immunity (Min) | 25kV/µs (Typ) |
| Data Rate | 1Mbps |
| Voltage - Supply | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) |
Substitute Part Grouping Explanation
Substitution eligibility for the SI8441AB-C-IS1 is determined by the following critical parameters:
- Channel Configuration: 4 channels with 3/1 input/output split
- Isolation Voltage: Minimum 2500Vrms
- Common Mode Transient Immunity: 25kV/µs (Typ)
- Data Rate: 1Mbps or higher
- Package: 16-SOIC form factor
- Supply Voltage Range: Must support 2.7V ~ 5.5V operation
- Operating Temperature: -40°C ~ 125°C
The SI8430AB-D-IS1 is a parametric equivalent with identical electrical specifications but differs in channel count (3 channels vs. 4 channels), making it suitable only for applications requiring fewer isolated channels.
The MAX14931 series variants (Analog Devices Inc./Maxim Integrated) are similar substitutes offering higher isolation voltage (2750Vrms), improved performance characteristics, and active product status. These parts maintain the same 4-channel 3/1 configuration and 16-SOIC package footprint, with variations in data rate and propagation delay based on specific part suffix.
Parameter Comparison
| Parameter | SI8441AB-C-IS1 | SI8430AB-D-IS1 | MAX14931DASE+ | MAX14931DASE+T | MAX14931BASE+ | MAX14931BASE+T | MAX14931CASE+ | MAX14931CASE+T |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | Skyworks | Skyworks | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 4 | 3 | 4 | 4 | 4 | 4 | 4 | 4 |
| Inputs - Side 1/Side 2 | 3/1 | 3/0 | 3/1 | 3/1 | 3/1 | 3/1 | 3/1 | 3/1 |
| Voltage - Isolation | 2500Vrms | 2500Vrms | 2750Vrms | 2750Vrms | 2750Vrms | 2750Vrms | 2750Vrms | 2750Vrms |
| Common Mode Transient Immunity (Min) | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs |
| Data Rate | 1Mbps | 1Mbps | 1Mbps | 1Mbps | 25Mbps | 25Mbps | 150Mbps | 150Mbps |
| Propagation Delay tpLH / tpHL (Max) | 35ns / 35ns | 35ns / 35ns | 54.1ns / 55.3ns | 54.1ns / 55.3ns | 27.5ns / 28.8ns | 27.5ns / 28.8ns | 7.5ns / 7.4ns | 7.5ns / 7.4ns |
| Pulse Width Distortion (Max) | 25ns | 25ns | 4.5ns | 4.5ns | 2.6ns | 2.6ns | 1ns | 1ns |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 1.71V ~ 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 | -40°C ~ 125°C |
| Package / Case | 16-SOIC (0.154", 3.90mm) | 16-SOIC (0.154", 3.90mm) | 16-SOIC (0.154", 3.90mm) | 16-SOIC (0.154", 3.90mm) | 16-SOIC (0.154", 3.90mm) | 16-SOIC (0.154", 3.90mm) | 16-SOIC (0.154", 3.90mm) | 16-SOIC (0.154", 3.90mm) |
| Packaging Type | Tube | Tube | Tube | Tape & Reel | Tube | Tape & Reel | Tube | Tape & Reel |
| Product Status | Not For New Designs | 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 | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) | 2 (1 Year) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
SI8430AB-D-IS1 (Skyworks Solutions Inc.)
This part is a parametric equivalent for applications requiring only 3 isolated channels. It maintains identical electrical performance to the SI8441AB-C-IS1 across isolation voltage, CMTI, data rate, and propagation delay. However, the reduced channel count (3 vs. 4) limits its use to designs that do not require the fourth channel. Both parts share "Not For New Designs" status, indicating limited long-term availability.
MAX14931 Series (Analog Devices Inc./Maxim Integrated)
The MAX14931 series represents the primary substitute path for new designs and ongoing production. All variants maintain the critical 4-channel 3/1 configuration and 16-SOIC package footprint. Key advantages include:
- Active product status with full manufacturer support
- Higher isolation voltage (2750Vrms vs. 2500Vrms)
- Extended supply voltage range (1.71V ~ 5.5V vs. 2.7V ~ 5.5V)
- ROHS3 compliance and improved MSL rating (1 vs. 2)
- Multiple data rate options to match application requirements
Data Rate Selection within MAX14931 Series:
- MAX14931DASE+ / MAX14931DASE+T: 1Mbps operation, direct speed equivalent to SI8441AB-C-IS1
- MAX14931BASE+ / MAX14931BASE+T: 25Mbps operation, improved propagation delay and pulse width distortion
- MAX14931CASE+ / MAX14931CASE+T: 150Mbps operation, optimal for high-speed isolation requirements
Packaging Considerations:
- Tube packaging (standard suffix): Suitable for manual assembly and lower-volume production
- Tape & Reel packaging (suffix +T): Optimized for automated pick-and-place assembly and high-volume manufacturing
Frequently Asked Questions (FAQ)
Q: Can SI8430AB-D-IS1 directly replace SI8441AB-C-IS1?
A: SI8430AB-D-IS1 is a parametric equivalent only for applications using 3 or fewer isolated channels. The SI8430AB-D-IS1 has 3 channels with 3/0 input/output configuration, while SI8441AB-C-IS1 has 4 channels with 3/1 configuration. If your design requires all 4 channels, this substitution is not compatible.
Q: Why do MAX14931 variants have different data rates?
A: The MAX14931 series offers multiple speed grades to accommodate different application requirements. The 1Mbps variant (MAX14931DASE+) matches the SI8441AB-C-IS1 speed. Higher-speed variants (25Mbps and 150Mbps) provide improved propagation delay and pulse width distortion characteristics for applications requiring faster signal transmission.
Q: What is the difference between Tube and Tape & Reel packaging?
A: Tube packaging is suitable for manual assembly, prototyping, and lower-volume production runs. Tape & Reel packaging is optimized for automated assembly equipment and high-volume manufacturing. Both contain identical components; the difference is in delivery format and handling method.
Q: Are MAX14931 parts pin-compatible with SI8441AB-C-IS1?
A: Both SI8441AB-C-IS1 and MAX14931 variants use 16-SOIC packages with identical pinout for the 4-channel 3/1 configuration. PCB layout compatibility is maintained, allowing direct substitution without redesign.
Q: What is the significance of the higher isolation voltage in MAX14931 (2750Vrms vs. 2500Vrms)?
A: The 2750Vrms isolation rating in MAX14931 provides additional safety margin and compliance headroom for applications operating near isolation voltage limits. This higher rating does not require circuit changes and is fully backward compatible with designs specified for 2500Vrms isolation.
Q: Why is SI8441AB-C-IS1 marked "Not For New Designs"?
A: This designation indicates the part has reached end-of-life status and is no longer recommended for new product development. Existing inventory remains available for legacy system support, but new designs should transition to active alternatives such as the MAX14931 series.
Q: Does the extended supply voltage range of MAX14931 (1.71V ~ 5.5V) affect circuit design?
A: The extended lower voltage limit (1.71V vs. 2.7V) provides additional flexibility for low-power applications. Existing designs operating within the original 2.7V ~ 5.5V range require no modification and remain fully compatible.
Q: What is MSL rating and why does it matter?
A: Moisture Sensitivity Level (MSL) indicates the component's sensitivity to moisture absorption during storage and handling. SI8441AB-C-IS1 has MSL 2 (1 Year shelf life), while MAX14931 variants have MSL 1 (Unlimited shelf life). MSL 1 components offer longer storage stability and reduced risk of moisture-related failures during assembly.
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