SMAJ22AE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMAJ22AE3/TR13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This surface-mount component operates in the 22V reverse standoff voltage class and features a 35.5V maximum clamping voltage with 14.1A peak pulse current capability. The part is active in production status and RoHS3 compliant with unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching or compatible electrical characteristics within the TVS diode category, specifically those sharing the same reverse standoff voltage class, similar clamping voltage performance, compatible package format (DO-214AC/SMA), and surface-mount technology. Substitutes must maintain functional equivalence for general-purpose transient voltage suppression applications.

Substiute Parts

SMAJ22AE3/TR13

Microchip TechnologyIn Stock: 978SMAJ22AE3/TR13 Datasheet

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SM4T26AY

STMicroelectronicsIn Stock: 10776SM4T26AY Datasheet

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SMAJ22A

MDDIn Stock: 44967SMAJ22A Datasheet

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SMAJ22A

MDDIn Stock: 44967SMAJ22A Datasheet

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SMAJ22A-13-F

Diodes IncorporatedIn Stock: 45171SMAJ22A-13-F Datasheet

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SMAJ22A-TP

Micro Commercial CoIn Stock: 4117SMAJ22A-TP Datasheet

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SZ1SMA22AT3G

Littelfuse Inc.In Stock: 10321SZ1SMA22AT3G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ22AE3/TR13 are grouped based on strict electrical and mechanical compatibility criteria. All identified substitutes share the following mandatory parameters:

Matching Parameters:

• Voltage - Reverse Standoff (Typ): 22V
• Voltage - Breakdown (Min): 24.4V
• Voltage - Clamping (Max) @ Ipp: 35.5V (with exception noted below)
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Type: Zener
• Unidirectional Channels: 1
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitution Categories:

Category A - Direct Electrical Equivalents (35.5V Clamping): Parts with identical clamping voltage specifications, suitable for direct replacement in applications where the original 14.1A peak pulse current and 500W peak pulse power are not exceeded.

Category B - Higher Performance Variant (48.3V Clamping): The SM4T26AY offers elevated clamping voltage and significantly higher current handling (48A at 8/20µs pulse), applicable in designs requiring enhanced transient suppression capability within the same voltage class.

All substitute parts maintain the 22V reverse standoff voltage and 24.4V minimum breakdown voltage, ensuring circuit protection threshold consistency.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement Substitutes (Category A):

The SMAJ22A (MDD), SMAJ22A-13-F (Diodes Incorporated), SMAJ22A-TP (Micro Commercial Co), and SZ1SMA22AT3G (Littelfuse) are functionally equivalent to the SMAJ22AE3/TR13 for applications operating within the original design specifications. These parts share identical voltage parameters and package format.

Selection Considerations:

• SMAJ22A (MDD): Provides direct electrical equivalence with 11.3A peak pulse current. Operating temperature range extends to -50°C minimum, suitable for applications not requiring extended low-temperature performance below -50°C.

• SMAJ22A-13-F (Diodes Incorporated): Offers equivalent performance with 11.2A peak pulse current and extended operating temperature range (-55 to 150°C). Tape & Reel packaging available. Suitable for designs requiring lower temperature operation.

• SMAJ22A-TP (Micro Commercial Co): Provides equivalent electrical characteristics with 11.2A peak pulse current and extended upper temperature rating to 175°C (TA). Applicable in high-temperature environments.

• SZ1SMA22AT3G (Littelfuse): Delivers equivalent performance with 11.3A peak pulse current, matching the original operating temperature range (-65 to 150°C). Automotive-grade qualification (AEC-Q101) and specified capacitance (540pF @ 1MHz) available. Suitable for automotive and high-reliability applications.

Higher Performance Alternative (Category B):

• SM4T26AY (STMicroelectronics): Offers elevated clamping voltage (48.3V) and significantly higher peak pulse current (48A at 8/20µs pulse specification). Automotive-grade qualification (AEC-Q101) included. This part is applicable in designs requiring enhanced transient suppression capability or higher current handling within the 22V voltage class. Note: Different pulse specification (8/20µs versus 10/1000µs) and higher clamping voltage require circuit-level evaluation for compatibility.

Compliance Status:

All identified substitutes maintain RoHS3 compliance, unlimited moisture sensitivity rating (MSL 1), and active production status. Automotive-qualified variants (SZ1SMA22AT3G and SM4T26AY) are available for applications requiring AEC-Q101 certification.

Frequently Asked Questions (FAQ)

Q: Can SMAJ22A (MDD) be used as a direct replacement for SMAJ22AE3/TR13?

A: Yes. The SMAJ22A shares identical voltage specifications (22V reverse standoff, 24.4V breakdown, 35.5V clamping) and package format (DO-214AC/SMA). Peak pulse current is 11.3A compared to 14.1A in the original part. Direct substitution is valid for applications where transient current does not exceed 11.3A. Operating temperature minimum is -50°C; verify compatibility if operation below -50°C is required.

Q: What is the difference between SMAJ22A-13-F and SMAJ22A-TP?

A: Both parts provide equivalent electrical performance (22V standoff, 35.5V clamping, 11.2A peak pulse current) and identical package format. SMAJ22A-13-F operates from -55 to 150°C (TJ). SMAJ22A-TP operates from -55 to 175°C (TA), providing extended high-temperature capability. Selection depends on application temperature requirements.

Q: Is SZ1SMA22AT3G suitable for automotive applications?

A: Yes. SZ1SMA22AT3G carries AEC-Q101 automotive qualification and provides equivalent electrical performance to the original part (22V standoff, 35.5V clamping, 11.3A peak pulse current). Operating temperature range matches the original (-65 to 150°C). Capacitance specification (540pF @ 1MHz) is provided.

Q: When should SM4T26AY be selected instead of direct equivalents?

A: SM4T26AY is selected when application requirements include higher transient current handling (48A at 8/20µs pulse) or elevated clamping voltage (48.3V) within the 22V voltage class. This part carries AEC-Q101 automotive qualification. Note that the pulse specification differs (8/20µs versus 10/1000µs); circuit-level evaluation is required to confirm compatibility with the original design.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Tape & Reel packaging is confirmed for SMAJ22AE3/TR13 (original), SMAJ22A-13-F, SMAJ22A-TP, SZ1SMA22AT3G, and SM4T26AY. SMAJ22A (MDD) packaging information is not specified in available data. Verify packaging availability with the supplier for the MDD variant.

Q: Do all substitutes maintain RoHS3 compliance?

A: Yes. All identified substitute parts are RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1), matching the original part's compliance status.

Q: What is the impact of lower peak pulse current in substitute parts?

A: Substitute parts SMAJ22A, SMAJ22A-13-F, SMAJ22A-TP, and SZ1SMA22AT3G specify 11.2–11.3A peak pulse current compared to 14.1A in the original SMAJ22AE3/TR13. These parts are suitable for applications where transient current does not exceed their rated specification. If the original design requires 14.1A capability, SM4T26AY (48A) provides higher current handling, or the original part should be retained.

Q: Can SMAJ22A-TP operate at higher temperatures than the original part?

A: Yes. SMAJ22A-TP specifies operating temperature to 175°C (TA) compared to 150°C (TJ) for the original SMAJ22AE3/TR13. This extended high-temperature rating is applicable in thermal environments exceeding 150°C. Note the temperature specification difference (TA versus TJ); verify thermal management requirements for the specific application.