P6SMB30 Equivalent & Substitute Parts

Part Overview

The P6SMB30 is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This unidirectional Zener diode operates with a reverse standoff voltage of 25.6V and provides clamping at 43.47V with a peak pulse current of 14.7A. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within the same electrical and mechanical parameters.

Substiute Parts

P6SMB30

Littelfuse Inc.In Stock: 848P6SMB30 Datasheet

Current PartRFQ

P6SMB30A

Eaton - Electronics DivisionIn Stock: 25016P6SMB30A Datasheet

DirectRFQ

SZP6SMB30AT3G

Littelfuse Inc.In Stock: 1477SZP6SMB30AT3G Datasheet

MFR RecommendedRFQ

P6SMB30A

Eaton - Electronics DivisionIn Stock: 25016P6SMB30A Datasheet

DirectRFQ

SM6T30A

STMicroelectronicsIn Stock: 37818SM6T30A Datasheet

MFR RecommendedRFQ

SM6T30A-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 30322SM6T30A-E3/52 Datasheet

MFR RecommendedRFQ

SM6T30A-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 5050SM6T30A-E3/5B Datasheet

MFR RecommendedRFQ

SM6T30AY

STMicroelectronicsIn Stock: 1407SM6T30AY Datasheet

MFR RecommendedRFQ

SMBJP6KE30A-TP

Micro Commercial CoIn Stock: 9348SMBJP6KE30A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMB30 is determined by strict alignment of the following electrical and mechanical parameters:

• Reverse standoff voltage: 25.6V (nominal)
• Breakdown voltage minimum: 27V or higher
• Package type: DO-214AA / SMB surface mount
• Unidirectional configuration: Single channel Zener
• Peak pulse power rating: 600W
• Operating temperature range compatibility

Substitute parts are grouped into two categories based on clamping voltage performance:

Group A (Clamping 41.4V - 41.5V): Parts with lower clamping voltages suitable for applications requiring tighter voltage regulation. These include P6SMB30A (Eaton), SZP6SMB30AT3G (Littelfuse), SM6T30A-E3/52 (Vishay), SM6T30A-E3/5B (Vishay), and SMBJP6KE30A-TP (Micro Commercial Co).

Group B (Clamping 54.6V): Parts with higher clamping voltages from STMicroelectronics (SM6T30A and SM6T30AY) that provide different transient suppression characteristics while maintaining the same standoff voltage and package format.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Group A - Clamping 41.4V - 41.5V):

SZP6SMB30AT3G (Littelfuse Inc.) is the manufacturer-recommended direct replacement. It maintains ROHS3 compliance, extends the operating temperature range to -65°C, and is actively produced. This part provides the closest electrical match with minimal clamping voltage deviation (41.4V vs. 43.47V).

SM6T30A-E3/52 and SM6T30A-E3/5B (Vishay General Semiconductor - Diodes Division) are functionally equivalent alternatives with clamping voltage of 41.5V and extended temperature range (-65°C ~ 150°C). Both maintain ROHS3 compliance and are actively produced.

SMBJP6KE30A-TP (Micro Commercial Co) provides equivalent electrical performance with the widest operating temperature range (-55°C ~ 175°C) and ROHS3 compliance. Peak pulse current matches the original specification at 14.7A.

P6SMB30A (Eaton - Electronics Division) offers electrical compatibility but carries RoHS non-compliance status, limiting its use in regulated applications.

Secondary Substitutes (Group B - Clamping 54.6V):

SM6T30A and SM6T30AY (STMicroelectronics) feature higher clamping voltage (54.6V) and significantly higher peak pulse current (75A at 8/20µs). These parts are suitable only for applications where higher clamping voltage is acceptable. SM6T30AY includes automotive-grade qualification (AEC-Q101).

Frequently Asked Questions (FAQ)

Q: Can I directly replace P6SMB30 with any of these substitute parts?

A: Direct replacement depends on application requirements. Group A substitutes (41.4V - 41.5V clamping) are electrically closest to the original 43.47V specification. Group B substitutes (54.6V clamping) require circuit validation to confirm compatibility with higher clamping voltage. All substitutes maintain the same 25.6V reverse standoff voltage, 600W peak power, and DO-214AA/SMB package format.

Q: What is the difference between Group A and Group B substitutes?

A: Group A parts (P6SMB30A, SZP6SMB30AT3G, SM6T30A-E3/52, SM6T30A-E3/5B, SMBJP6KE30A-TP) provide clamping voltages between 41.4V and 41.5V, closely matching the original 43.47V specification. Group B parts (SM6T30A, SM6T30AY) clamp at 54.6V with significantly higher peak pulse current (75A vs. 14.7A), suitable for different transient protection requirements.

Q: Are all substitutes RoHS compliant?

A: Most substitutes are ROHS3 compliant. P6SMB30A (Eaton) is RoHS non-compliant and should be avoided in regulated applications. SZP6SMB30AT3G, SM6T30A-E3/52, SM6T30A-E3/5B, SM6T30A, SM6T30AY, and SMBJP6KE30A-TP all meet ROHS3 requirements.

Q: Does operating temperature range affect substitution?

A: The original P6SMB30 operates from -55°C to 150°C. SZP6SMB30AT3G, SM6T30A-E3/52, and SM6T30A-E3/5B extend the lower limit to -65°C. SMBJP6KE30A-TP extends the upper limit to 175°C. Verify that the selected substitute's temperature range meets your application requirements.

Q: What certifications should I consider?

A: SM6T30AY includes automotive-grade qualification (AEC-Q101), suitable for automotive and high-reliability applications. All other active substitutes are general-purpose components. Select based on your application's qualification requirements.

Q: Can I use SM6T30A or SM6T30AY as direct replacements?

A: These parts share the same 25.6V reverse standoff voltage and package format but feature significantly different clamping characteristics (54.6V vs. 43.47V) and peak pulse current (75A vs. 14.7A). Use only if your circuit design accommodates higher clamping voltage and current handling.