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SI8441AB-D-IS Equivalent & Substitute Parts
Part Overview
The SI8441AB-D-IS is a general purpose digital isolator manufactured by Skyworks Solutions Inc., featuring 2500Vrms isolation across 4 channels with 1Mbps data rate and 25kV/µs common mode transient immunity. The device is housed in a 16-SOIC package and operates across a 2.7V to 5.5V supply range with -40°C to 125°C temperature rating. This part carries a "Not For New Designs" status, making identification of equivalent and substitute components essential for ongoing production support and design flexibility.
Substiute Parts
Key Parameters
| Parameter | SI8441AB-D-IS |
|---|---|
| Manufacturer | Skyworks Solutions Inc. |
| Number of Channels | 4 |
| Voltage - Isolation | 2500Vrms |
| Data Rate | 1Mbps |
| Common Mode Transient Immunity (Min) | 25kV/µs (Typ) |
| Propagation Delay tpLH / tpHL (Max) | 35ns / 35ns |
| Voltage - Supply | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Package / Case | 16-SOIC (0.295", 7.50mm Width) |
| Technology | Capacitive Coupling |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the SI8441AB-D-IS is determined by the following critical parameters: number of channels (4), isolation voltage (2500Vrms minimum), common mode transient immunity (25kV/µs minimum), package type (16-SOIC), and supply voltage compatibility (2.7V ~ 5.5V). Parts are grouped into two categories:
Parametric Equivalents maintain identical or near-identical electrical specifications within the same isolation voltage class (2500Vrms) and channel configuration, differing only in channel count or minor timing characteristics.
Similar Parts offer enhanced performance specifications (higher isolation voltage, faster data rates, improved CMTI) while maintaining the same 4-channel configuration and 16-SOIC package, suitable for applications requiring higher performance margins or automotive qualification.
Parameter Comparison
| Part Number | Manufacturer | Channels | Isolation (Vrms) | Data Rate (Mbps) | CMTI (kV/µs) | tpLH/tpHL Max (ns) | Supply (V) | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| SI8441AB-D-IS | Skyworks | 4 | 2500 | 1 | 25 | 35/35 | 2.7-5.5 | 16-SOIC | Not For New Designs |
| SI8431AB-D-IS | Skyworks | 3 | 2500 | 1 | 25 | 35/35 | 2.7-5.5 | 16-SOIC | Not For New Designs |
| MAX14931AAWE+ | Analog Devices/Maxim | 4 | 2750 | 1 | 25 | 54.1/55.3 | 1.71-5.5 | 16-SOIC | Active |
| ISO7341CQDWQ1 | Texas Instruments | 4 | 3000 | 25 | 25 | 58/58 | 3-5.5 | 16-SOIC | Active |
| ISO7341CQDWRQ1 | Texas Instruments | 4 | 3000 | 25 | 25 | 58/58 | 3-5.5 | 16-SOIC | Active |
| ISO7341FCDW | Texas Instruments | 4 | 3000 | 25 | 25 | 58/58 | 3-5.5 | 16-SOIC | Active |
| ISO7341FCDWR | Texas Instruments | 4 | 3000 | 25 | 25 | 58/58 | 3-5.5 | 16-SOIC | Active |
| ISO7341FCQDWQ1 | Texas Instruments | 4 | 3000 | 25 | 25 | 58/58 | 3-5.5 | 16-SOIC | Active |
| ISO7341FCQDWRQ1 | Texas Instruments | 4 | 3000 | 25 | 25 | 58/58 | 3-5.5 | 16-SOIC | Active |
| ISO7841DW | Texas Instruments | 4 | 5700 | 100 | 100 | 16/16 | 2.25-5.5 | 16-SOIC | Active |
| ISO7841DWR | Texas Instruments | 4 | 5700 | 100 | 100 | 16/16 | 2.25-5.5 | 16-SOIC | Active |
Engineering Selection Recommendations
For Direct Replacement (Minimum Specification Match): The MAX14931AAWE+ from Analog Devices/Maxim Integrated provides the closest functional equivalent with 4-channel configuration, 2750Vrms isolation, and 1Mbps data rate. This part is currently in Active status and maintains ROHS3 compliance. The extended supply voltage range (1.71V to 5.5V) offers additional design flexibility compared to the SI8441AB-D-IS.
For Enhanced Performance Applications: Texas Instruments ISO7341 series (CQDWQ1, CQDWRQ1, FCDW, FCDWR, FCQDWQ1, FCQDWRQ1) offer 3000Vrms isolation with 25Mbps data rate, maintaining identical 4-channel configuration and 16-SOIC packaging. These parts are Active status with AEC-Q100 automotive qualification available on selected variants. The higher data rate accommodates future bandwidth requirements while maintaining backward compatibility with 1Mbps legacy protocols.
For Maximum Performance Margin: The Texas Instruments ISO7841 series (DW, DWR) provides 5700Vrms isolation with 100Mbps data rate and 100kV/µs CMTI, suitable for high-noise industrial environments. Extended operating temperature range (-55°C to 125°C) supports broader thermal applications.
Packaging Considerations: All recommended substitutes maintain the 16-SOIC (0.295", 7.50mm Width) package footprint, enabling direct PCB layout compatibility. Variants with "R" suffix (CQDWRQ1, FCDWR, FCQDWRQ1, DWR) are supplied in Tape & Reel format; non-R variants are supplied in Tube or Cut Tape packaging.
Frequently Asked Questions (FAQ)
Q: Can SI8431AB-D-IS (3-channel) replace SI8441AB-D-IS (4-channel)? A: SI8431AB-D-IS is a parametric equivalent with identical electrical specifications but reduced channel count (3 vs. 4). Substitution is only valid if the application requires 3 or fewer isolated channels. Pin-to-pin compatibility must be verified against the specific application schematic.
Q: What is the key difference between Skyworks SI8441AB-D-IS and Texas Instruments ISO7341 series? A: The primary differences are data rate (1Mbps vs. 25Mbps) and isolation voltage (2500Vrms vs. 3000Vrms). ISO7341 variants offer higher performance margins and are currently in Active production status. Supply voltage minimum differs: SI8441AB-D-IS operates from 2.7V while ISO7341 requires 3V minimum.
Q: Are ISO7341 automotive-qualified variants suitable for non-automotive applications? A: Yes. AEC-Q100 qualification indicates enhanced reliability testing and is applicable to any application requiring higher reliability assurance. Automotive-qualified parts (CQDWQ1, FCQDWQ1, FCQDWRQ1) can be used in industrial, medical, and consumer applications without restriction.
Q: What is the significance of the "R" suffix in part numbers like ISO7341CQDWRQ1? A: The "R" suffix indicates Tape & Reel packaging format, suitable for automated assembly processes. Parts without "R" (CQDWQ1, FCDW, FCQDWQ1) are supplied in Tube or Cut Tape format. Electrical specifications are identical; packaging format differs only.
Q: Can ISO7841DW (100Mbps) be used as a direct replacement for SI8441AB-D-IS (1Mbps)? A: ISO7841DW is functionally compatible but represents a performance upgrade. The higher data rate, isolation voltage (5700Vrms), and CMTI (100kV/µs) provide enhanced performance margins. Pin configuration and 16-SOIC package are identical. Verification of signal timing requirements is recommended due to lower propagation delay (16ns vs. 35ns).
Q: What is the moisture sensitivity level (MSL) impact on storage and handling? A: SI8441AB-D-IS carries MSL 2A (4 weeks); MAX14931AAWE+ carries MSL 1 (Unlimited); Texas Instruments parts carry MSL 2 (1 Year). Lower MSL ratings require shorter shelf life management and more stringent moisture control during storage and assembly. MSL 1 parts offer the most flexible handling and storage conditions.
Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring compatibility with environmental regulations and customer requirements.
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