TPSMB20HE3/52T Equivalent & Substitute Parts

Part Overview

The TPSMB20HE3/52T is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for surface mount applications in the DO-214AA (SMB) package and provides 16.2V reverse standoff voltage with 29.1V maximum clamping voltage at peak pulse current. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

TPSMB20HE3/52T

Vishay General Semiconductor - Diodes DivisionIn Stock: 707TPSMB20HE3/52T Datasheet

Current PartRFQ

TPSMB20AHE3_A/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 899TPSMB20AHE3_A/H Datasheet

DirectRFQ

1KSMB20A

Taiwan Semiconductor CorporationIn Stock: 9021KSMB20A Datasheet

MFR RecommendedRFQ

P6SMB20A

Eaton - Electronics DivisionIn Stock: 5158P6SMB20A Datasheet

MFR RecommendedRFQ

P6SMB20A

Eaton - Electronics DivisionIn Stock: 5158P6SMB20A Datasheet

MFR RecommendedRFQ

PTVS17VP1UP,115

NXP USA Inc.In Stock: 61371PTVS17VP1UP,115 Datasheet

MFR RecommendedRFQ

SMBJP6KE20A-TP

Micro Commercial CoIn Stock: 30145SMBJP6KE20A-TP Datasheet

MFR RecommendedRFQ

SZP6SMB20AT3G

Littelfuse Inc.In Stock: 5473SZP6SMB20AT3G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPSMB20HE3/52T is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Reverse standoff voltage within acceptable tolerance (16.2V nominal)
• Breakdown voltage minimum (18V or higher)
• Clamping voltage maximum (27.7V to 29.1V range)
• Peak pulse current capability (20.6A minimum)
• Power dissipation rating (600W minimum)
• Unidirectional Zener type configuration

Mechanical Compatibility Criteria:

• Surface mount package: DO-214AA or SMB equivalent
• Mounting type: Surface mount
• Moisture sensitivity level: MSL 1 or better

Environmental & Compliance Criteria:

• Operating temperature range: -65°C to 185°C preferred; -55°C to 175°C acceptable
• Automotive grade and AEC-Q101 qualification preferred
• RoHS3 compliance required

All substitute parts listed meet the electrical parameters within the specified tolerance band and maintain mechanical compatibility with the original DO-214AA SMB package footprint.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: TPSMB20AHE3_A/H

The TPSMB20AHE3_A/H from Vishay is the direct successor to the obsolete TPSMB20HE3/52T. Both parts share identical electrical specifications within the critical parameters (reverse standoff voltage, clamping voltage, peak pulse current, power rating) and maintain the same DO-214AA SMB package. The substitute part carries active product status, automotive grade qualification, AEC-Q101 certification, and ROHS3 compliance. Operating temperature range extends to 185°C, matching the original specification.

Secondary Recommendations: SZP6SMB20AT3G and SMBJP6KE20A-TP

Both the SZP6SMB20AT3G (Littelfuse) and SMBJP6KE20A-TP (Micro Commercial Co) provide equivalent electrical performance with clamping voltage of 27.7V and peak pulse current of 22A. Both maintain automotive grade status and AEC-Q101 qualification. Operating temperature maximum is 150°C, which is lower than the original specification but acceptable for most applications. Both are ROHS3 compliant with MSL 1 rating.

Alternative Recommendation: 1KSMB20A

The 1KSMB20A from Taiwan Semiconductor Corporation offers enhanced power dissipation capability (1000W versus 600W) and higher peak pulse current (36.1A), providing additional margin for transient protection. This part is suitable for applications requiring higher energy absorption. However, it lacks automotive grade designation and AEC-Q101 qualification, making it appropriate only for general-purpose applications where automotive compliance is not required.

Package Consideration: PTVS17VP1UP,115

The PTVS17VP1UP,115 from NXP USA Inc. (Nexperia) provides equivalent electrical performance but uses the SOD-128 package instead of DO-214AA SMB. This part is suitable only if the PCB layout can accommodate the different package footprint. It carries automotive grade and AEC-Q101 qualification with active product status.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for TPSMB20HE3/52T?

A: The TPSMB20AHE3_A/H is the direct replacement with identical specifications. Other substitutes are compatible based on electrical parameters but may have different operating temperature ranges or package types. Verify that the selected substitute meets your specific application requirements, particularly operating temperature and package footprint.

Q: What is the difference between the clamping voltage of 29.1V (original) and 27.7V (most substitutes)?

A: The original part specifies a maximum clamping voltage of 29.1V, while most substitutes specify 27.7V. Both values fall within acceptable transient suppression performance for the 16.2V to 17.1V reverse standoff voltage range. The lower clamping voltage of the substitutes provides slightly tighter voltage regulation. Verify that your circuit design can tolerate the 27.7V clamping level.

Q: Why does the 1KSMB20A have higher peak pulse current (36.1A) and power rating (1000W)?

A: The 1KSMB20A is designed for higher energy transient events. The increased ratings provide additional protection margin but are not required for applications designed around the original 20.6A / 600W specification. Use this part only if your application requires enhanced transient protection capability.

Q: Are all substitute parts automotive qualified?

A: No. The TPSMB20AHE3_A/H, SZP6SMB20AT3G, PTVS17VP1UP,115, and SMBJP6KE20A-TP carry automotive grade designation and AEC-Q101 qualification. The 1KSMB20A and P6SMB20A do not carry automotive qualification and are suitable only for general-purpose applications.

Q: What is the significance of the SOD-128 package used by PTVS17VP1UP,115?

A: The SOD-128 package is physically different from the DO-214AA SMB package used by the original part and most substitutes. If you select this part, your PCB layout must be modified to accommodate the different package footprint and pin configuration. This part is suitable only if your design can be updated for the alternative package.

Q: Which substitute part should I choose for a new design?

A: For new designs requiring automotive compliance, select either TPSMB20AHE3_A/H (Vishay), SZP6SMB20AT3G (Littelfuse), or SMBJP6KE20A-TP (Micro Commercial Co). All three maintain automotive grade and AEC-Q101 qualification with active product status. For general-purpose applications without automotive requirements, the 1KSMB20A offers enhanced protection capability. Verify component availability and lead time with your supplier.

Q: What is the operating temperature limitation of the substitute parts?

A: The original TPSMB20HE3/52T operates from -65°C to 185°C. The TPSMB20AHE3_A/H maintains this range. Most other substitutes operate to 150°C or 175°C maximum. If your application requires operation above 175°C, use only TPSMB20AHE3_A/H or verify that the selected substitute's temperature range is acceptable for your circuit.