P4SMA33A-M3/5A Equivalent & Substitute Parts

Part Overview

The P4SMA33A-M3/5A is an active Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This unidirectional zener diode operates in the 28.2V reverse standoff voltage class and provides transient overvoltage protection in surface mount DO-214AC (SMA) packaging. The part is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1) and is suitable for general purpose applications requiring transient voltage suppression. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the same package class.

Substiute Parts

P4SMA33A-M3/5A

Vishay General Semiconductor - Diodes DivisionIn Stock: 1021P4SMA33A-M3/5A Datasheet

Current PartRFQ

P4SMA33A-E3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 3650P4SMA33A-E3/61 Datasheet

DirectRFQ

P4SMA33A

Eaton - Electronics DivisionIn Stock: 2902P4SMA33A Datasheet

MFR RecommendedRFQ

P4SMA33A

Eaton - Electronics DivisionIn Stock: 2902P4SMA33A Datasheet

MFR RecommendedRFQ

P4SMA33AH

Taiwan Semiconductor CorporationIn Stock: 8669P4SMA33AH Datasheet

MFR RecommendedRFQ

SMAJ33A

MDDIn Stock: 65153SMAJ33A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4SMA33A-M3/5A are classified based on electrical parameter compatibility within the 28.2V to 33V reverse standoff voltage range and matching mechanical package specifications. The primary substitution criteria are:

• Reverse standoff voltage within the 28.2V to 33V class
• Clamping voltage performance at rated peak pulse current
• Peak pulse power rating of 400W
• Surface mount DO-214AC (SMA) package compatibility
• Operating temperature range support
• Active product status and regulatory compliance (ROHS3)

Parts are grouped into two categories: direct electrical equivalents with identical voltage ratings (28.2V standoff) and compatible alternatives with slightly elevated voltage ratings (33V standoff) that maintain functional compatibility within the same application class.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical Performance):

P4SMA33A-E3/61 from Vishay is a direct equivalent to P4SMA33A-M3/5A with identical electrical specifications and packaging. Both parts share the same base product number (P4SMA33), voltage ratings, and thermal characteristics. Selection between these two Vishay variants depends on packaging format availability (Tape & Reel for both).

Compatible Alternatives (Matched Voltage Class):

P4SMA33A from Eaton and P4SMA33AH from Taiwan Semiconductor are compatible substitutes with matching 28.2V standoff voltage and 45.7V clamping performance. The Eaton variant operates across -55°C to 150°C (versus -65°C to 150°C for the original), while the Taiwan Semiconductor part includes AEC-Q101 automotive qualification and ROHS3 compliance. Peak pulse current is rated at 9.0A for both alternatives, providing equivalent or superior performance margin.

Higher Voltage Alternative (Different Application Class):

SMAJ33A from MDD operates in the 33V standoff voltage class with 53.3V clamping voltage. This part is suitable only for applications where the higher voltage rating is acceptable and does not conflict with circuit protection requirements. The reduced peak pulse current (7.5A) and higher minimum operating temperature (-50°C) represent functional differences that must be evaluated against specific application constraints.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating. The P4SMA33AH variant includes automotive-grade qualification (AEC-Q101), making it suitable for automotive and high-reliability applications where such certification is required.

Frequently Asked Questions (FAQ)

Q: Can P4SMA33A-E3/61 be used as a direct replacement for P4SMA33A-M3/5A?

A: Yes. Both parts are manufactured by Vishay with identical electrical specifications (28.2V standoff, 45.7V clamp, 8.8A peak pulse current) and DO-214AC (SMA) packaging. The difference is in packaging format (Tape & Reel for both), making them functionally interchangeable.

Q: What is the difference between the Eaton P4SMA33A and the original Vishay part?

A: The Eaton P4SMA33A maintains the same 28.2V standoff voltage and 45.7V clamping voltage with slightly higher peak pulse current (9.0A versus 8.8A). The operating temperature range is -55°C to 150°C compared to -65°C to 150°C for the Vishay original. Both use DO-214AC (SMA) packaging and are ROHS compliant.

Q: Is the Taiwan Semiconductor P4SMA33AH suitable for automotive applications?

A: Yes. The P4SMA33AH includes AEC-Q101 automotive qualification and ROHS3 compliance. It matches the electrical performance of the original part (28.2V standoff, 45.7V clamp, 9.0A peak pulse) and is suitable for automotive and high-reliability applications.

Q: Can SMAJ33A replace P4SMA33A-M3/5A in all applications?

A: SMAJ33A operates in a different voltage class (33V standoff versus 28.2V) with higher clamping voltage (53.3V versus 45.7V). It is suitable only for applications where the higher voltage rating does not compromise circuit protection. The reduced peak pulse current (7.5A) and higher minimum operating temperature (-50°C) must also be considered.

Q: Are all substitute parts available in the same DO-214AC (SMA) package?

A: Yes. All listed substitute parts use DO-214AC (SMA) surface mount packaging, ensuring mechanical and footprint compatibility with the original P4SMA33A-M3/5A design.

Q: What is the difference between ROHS3 and RoHS compliance?

A: ROHS3 represents compliance with the latest Restriction of Hazardous Substances directive including additional restricted substances. RoHS indicates compliance with earlier directive versions. Both meet hazardous substance restrictions; ROHS3 represents the current standard.