1SMA4741 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA4741 is an 11 V, 1.25 W surface mount zener diode manufactured by Taiwan Semiconductor Corporation in DO-214AC (SMA) packaging. This component is classified as an active product with RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified based on matching zener voltage, tolerance, mounting type, and package compatibility while accommodating variations in power dissipation and electrical characteristics within acceptable operating parameters.

Substiute Parts

1SMA4741

Taiwan Semiconductor CorporationIn Stock: 10501SMA4741 Datasheet

Current PartRFQ

1SMA5926BT3G

onsemiIn Stock: 101441SMA5926BT3G Datasheet

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3SMAJ5926B-TP

Micro Commercial CoIn Stock: 70733SMAJ5926B-TP Datasheet

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SMAJ4741A-TP

Micro Commercial CoIn Stock: 1499SMAJ4741A-TP Datasheet

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SZ1SMA5926BT3G

onsemiIn Stock: 690SZ1SMA5926BT3G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1SMA4741 is determined by the following criteria:

Primary Matching Parameters:

• Zener voltage: 11 V nominal
• Tolerance: ±5%
• Mounting type: Surface Mount
• Package: DO-214AC / SMA

Secondary Compatibility Parameters:

• Power dissipation rating (equal to or greater than 1.25 W)
• Impedance characteristics (Zzt)
• Reverse leakage current specifications
• Operating temperature range (minimum -55°C to 175°C coverage)
• RoHS3 compliance status

Substitute parts meeting these criteria are functionally equivalent for circuit applications requiring 11 V zener regulation at the specified power level and tolerance. Parts with higher power ratings or improved impedance characteristics provide enhanced performance margins while maintaining electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

1SMA5926BT3G (onsemi)

This substitute provides 11 V zener regulation with 1.5 W power dissipation, exceeding the 1.25 W requirement of the main part. Impedance is reduced to 5.5 Ohms with reverse leakage of 500 nA, representing improved performance characteristics. Operating temperature range is -65 to 150°C. RoHS3 compliance is maintained. This part is suitable for applications requiring enhanced thermal performance or lower impedance characteristics.

3SMAJ5926B-TP (Micro Commercial Co)

This substitute offers 11 V zener regulation with 3 W power dissipation, providing significant thermal margin above the 1.25 W specification. Impedance is 5.5 Ohms with reverse leakage of 1 µA. Operating temperature range is -55 to 150°C, matching the lower temperature limit of the main part. RoHS3 compliance is maintained. This part is applicable in high-power applications or designs requiring extended thermal headroom.

SMAJ4741A-TP (Micro Commercial Co)

This substitute provides 11 V zener regulation with 1 W power dissipation, operating below the 1.25 W rating of the main part. Impedance matches at 8 Ohms. Reverse leakage is specified at 5 µA. Operating temperature range is -65 to 150°C. RoHS3 compliance is maintained. This part is suitable for low-power applications where the reduced power rating is acceptable.

SZ1SMA5926BT3G (onsemi, AEC-Q101 Qualified)

This substitute provides 11 V zener regulation with 1.5 W power dissipation and AEC-Q101 automotive qualification. Impedance is 5.5 Ohms with reverse leakage of 500 nA. Operating temperature range is -65 to 150°C. RoHS3 compliance is maintained. This part is required for automotive applications or designs subject to automotive-grade component specifications.

Frequently Asked Questions (FAQ)

Q: Can the 1SMA4741 be replaced with a substitute having higher power dissipation?

A: Yes. Substitute parts with power ratings equal to or greater than 1.25 W are electrically compatible. Higher power ratings provide additional thermal margin and do not degrade circuit performance when the zener voltage and tolerance specifications match.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All listed substitutes use the DO-214AC (SMA) package, which maintains identical footprint and land pattern compatibility. Direct board-level substitution is possible without layout modifications.

Q: What is the significance of the impedance (Zzt) parameter in substitution?

A: Impedance affects voltage regulation stability and transient response. Lower impedance values (5.5 Ohms) provide improved regulation compared to higher values (8 Ohms). Substitutes with lower impedance offer enhanced performance but are functionally compatible with designs specified for higher impedance.

Q: Does the operating temperature range affect substitution eligibility?

A: Operating temperature range affects application suitability. The main part specifies -55 to 175°C. Substitutes with narrower ranges (-65 to 150°C) are compatible for applications operating within the substitute's specified range. Applications requiring the full -55 to 175°C range require the main part or equivalents with matching temperature specifications.

Q: Is the SZ1SMA5926BT3G suitable for non-automotive applications?

A: Yes. AEC-Q101 qualification indicates automotive-grade reliability but does not restrict use in non-automotive applications. This part is functionally equivalent to other 11 V, 1.5 W substitutes and may be selected based on availability or performance requirements.

Q: How does reverse leakage current affect circuit performance?

A: Reverse leakage current affects standby power consumption and regulation accuracy. Lower leakage values (500 nA) reduce power dissipation in reverse bias conditions compared to higher values (5 µA). Both are functionally acceptable; selection depends on application power budget requirements.

Q: Can substitutes with lower power ratings replace the 1SMA4741?

A: Substitutes with power ratings below 1.25 W (such as SMAJ4741A-TP at 1 W) are electrically compatible but operate with reduced thermal margin. Selection requires confirmation that circuit power dissipation does not exceed the substitute's rated power.