P4KE33A-B Equivalent & Substitute Parts

Part Overview

The P4KE33A-B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component operates across a wide temperature range (-55°C to 175°C) and is RoHS3 compliant. The part is currently active in production with 949 units in stock. Equivalent and substitute parts are identified to support design flexibility, inventory optimization, and supply chain continuity.

Substiute Parts

P4KE33A-B

Littelfuse Inc.In Stock: 1034P4KE33A-B Datasheet

Current PartRFQ

1.5KE33A

Good-Ark SemiconductorIn Stock: 348781.5KE33A Datasheet

MFR RecommendedRFQ

P4KE33A

Taiwan Semiconductor CorporationIn Stock: 1001P4KE33A Datasheet

MFR RecommendedRFQ

P6KE30A

Taiwan Semiconductor CorporationIn Stock: 25293P6KE30A Datasheet

MFR RecommendedRFQ

P6KE33A

Fairchild SemiconductorIn Stock: 15519P6KE33A Datasheet

MFR RecommendedRFQ

SA30A

Taiwan Semiconductor CorporationIn Stock: 45164SA30A Datasheet

MFR RecommendedRFQ

P6KE33A

Fairchild SemiconductorIn Stock: 15519P6KE33A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4KE33A-B are grouped based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 28.2V
• Voltage - Clamping (Max) @ Ipp: 45.7V
• Unidirectional Channels: 1
• Type: Zener
• Mounting Type: Through Hole
• RoHS3 Compliance

Secondary Considerations:

• Package compatibility (DO-204AL, DO-41, DO-15, DO-204AC)
• Current - Peak Pulse rating
• Power - Peak Pulse rating
• Operating temperature range
• Product status (Active)

The following substitute parts maintain the core voltage protection characteristics (28.2V standoff, 45.7V clamping) while offering variations in current handling capacity and package form factors:

• 1.5KE33A (Good-Ark Semiconductor): Identical voltage specifications with higher current rating (32.8A) and increased power dissipation (1500W)
• P4KE33A (Taiwan Semiconductor Corporation): Identical electrical and package specifications; alternative manufacturer source
• P6KE33A (Fairchild Semiconductor): Identical voltage specifications with moderate current increase (13.8A) and higher power rating (600W); DO-15 package variant
• P6KE30A (Taiwan Semiconductor Corporation): Lower voltage standoff (25.6V) and clamping (41.4V) with moderate current rating (14.5A) and 600W power dissipation; DO-15 package
• SA30A (Taiwan Semiconductor Corporation): Higher voltage standoff (30V) and clamping (64.3V) with moderate current rating (10.8A) and 500W power dissipation; DO-15 package

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical Performance):

The P4KE33A manufactured by Taiwan Semiconductor Corporation is a direct equivalent to the P4KE33A-B, maintaining identical voltage specifications (28.2V standoff, 45.7V clamping), current rating (9A), and power dissipation (400W). Both are RoHS3 compliant and active products. The primary difference is packaging format (Tape & Reel versus Bulk) and manufacturer source.

Higher Power Capacity Substitutes:

The 1.5KE33A (Good-Ark Semiconductor) and P6KE33A (Fairchild Semiconductor) maintain the critical voltage protection parameters (28.2V standoff, 45.7V clamping) while providing increased current handling and power dissipation. The 1.5KE33A offers the highest power capacity (1500W, 32.8A) and is suitable for applications requiring enhanced transient energy absorption. The P6KE33A provides moderate enhancement (600W, 13.8A) with a different package form factor (DO-15).

Alternative Voltage Ratings:

The P6KE30A and SA30A offer different voltage protection windows. The P6KE30A provides lower voltage clamping (41.4V) suitable for circuits with tighter voltage margins. The SA30A provides higher voltage clamping (64.3V) for applications requiring greater overvoltage tolerance. Both maintain RoHS3 compliance and active product status.

All substitute parts are active products with RoHS3 compliance, ensuring regulatory alignment and supply chain viability.

Frequently Asked Questions (FAQ)

Q: Can I use the 1.5KE33A as a direct replacement for the P4KE33A-B?

A: The 1.5KE33A maintains identical voltage specifications (28.2V standoff, 45.7V clamping) and is electrically compatible. However, it uses a DO-201AE package instead of the DO-204AL (DO-41) package of the P4KE33A-B. Physical board layout modifications may be required. The higher current rating (32.8A versus 9A) and power dissipation (1500W versus 400W) provide enhanced protection margin.

Q: What is the difference between the P4KE33A and P4KE33A-B?

A: Both parts share identical electrical specifications and package form factors. The designation difference typically reflects packaging format or manufacturing date code. The P4KE33A (Taiwan Semiconductor Corporation) is supplied in Tape & Reel format, while the P4KE33A-B (Littelfuse Inc.) is supplied in Bulk packaging.

Q: Can I substitute the SA30A for the P4KE33A-B?

A: The SA30A has different voltage specifications (30V standoff, 64.3V clamping versus 28.2V standoff, 45.7V clamping). This higher voltage rating makes it unsuitable for circuits designed for the P4KE33A-B protection window. Use only if your circuit design accommodates the higher clamping voltage.

Q: Are all substitute parts RoHS3 compliant?

A: The P4KE33A, 1.5KE33A, P6KE30A, and SA30A are confirmed RoHS3 compliant. The P6KE33A (Fairchild Semiconductor) does not specify RoHS status in the provided data. Verify compliance requirements with your procurement specifications before selection.

Q: What package considerations apply when selecting substitutes?

A: The P4KE33A-B uses DO-204AL (DO-41) axial package. The 1.5KE33A uses DO-201AE, while P6KE33A, P6KE30A, and SA30A use DO-204AC (DO-15) packages. Physical dimensions and lead spacing differ between these packages. Verify PCB footprint compatibility and lead bend radius requirements before substitution.

Q: Which substitute offers the best thermal performance?

A: The 1.5KE33A provides the highest power dissipation rating (1500W), enabling superior thermal performance under high transient energy conditions. The P6KE33A and P6KE30A both offer 600W ratings, providing moderate thermal enhancement over the base 400W rating of the P4KE33A-B.