3KP33A-B Equivalent & Substitute Parts

Part Overview

The 3KP33A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This component features a 33V reverse standoff voltage with a 53.3V maximum clamping voltage and 56.3A peak pulse current capability. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

3KP33A-B

Littelfuse Inc.In Stock: 11823KP33A-B Datasheet

Current PartRFQ

5KP33A-B

Littelfuse Inc.In Stock: 9185KP33A-B Datasheet

DirectRFQ

3KP33A-TP

Micro Commercial CoIn Stock: 24203KP33A-TP Datasheet

MFR RecommendedRFQ

5KP33A-TP

Micro Commercial CoIn Stock: 12205KP33A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3KP33A-B are selected based on matching the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff: 33V
• Voltage - Clamping (Max) @ Ipp: 53.3V
• Voltage - Breakdown (Min): 36.7V
• Operating Temperature Range: -55°C ~ 175°C
• Mounting Type: Through Hole
• Type: Zener TVS Diode
• Unidirectional Channels: 1
• RoHS3 Compliance

Substitutes are grouped into two categories based on power rating and peak pulse current capability, while maintaining identical voltage specifications and thermal operating range.

Parameter Comparison

Engineering Selection Recommendations

5KP33A-B (Littelfuse Inc.): This part is the direct electrical equivalent with identical voltage specifications and thermal range. It offers higher peak pulse current (95.7A) and power dissipation (5000W) compared to the main part, providing enhanced transient protection capability. Active product status ensures long-term availability and supply chain continuity. Package compatibility is maintained with P600 axial configuration. ROHS3 compliance is confirmed.

3KP33A-TP (Micro Commercial Co): This part maintains identical voltage and thermal specifications with 3000W power rating matching the main part. Active product status supports ongoing procurement. Package differs to R-6 axial configuration, requiring mechanical verification for board layout compatibility. ROHS3 compliance and REACH unaffected status are confirmed.

5KP33A-TP (Micro Commercial Co): This part provides higher power dissipation (5000W) with identical voltage specifications and thermal range. Active product status ensures availability. Package configuration is R-6 axial, requiring mechanical verification for board layout compatibility. ROHS3 compliance and REACH unaffected status are confirmed.

Frequently Asked Questions (FAQ)

Q: Can 5KP33A-B replace 3KP33A-B directly? A: Yes. Both parts share identical voltage specifications (33V standoff, 53.3V clamping), breakdown voltage, and operating temperature range. The 5KP33A-B provides higher peak pulse current and power dissipation, making it suitable for applications requiring enhanced transient protection. Package configuration (P600 axial) is identical.

Q: What is the difference between Littelfuse and Micro Commercial Co substitutes? A: Littelfuse 5KP33A-B maintains the original P600 axial package. Micro Commercial Co parts (3KP33A-TP and 5KP33A-TP) use R-6 axial packaging. Both manufacturers provide ROHS3-compliant components with identical voltage and thermal specifications. Package selection depends on board layout requirements.

Q: Are package differences between P600 and R-6 significant? A: Both are axial through-hole packages suitable for the same mounting type. Physical dimensions and lead spacing may differ. Verify board layout compatibility before substitution, particularly for high-density designs or automated assembly processes.

Q: Does higher power rating in 5KP series affect circuit performance? A: No. The 5KP series maintains identical voltage clamping and breakdown characteristics. Higher power rating (5000W vs 3000W) and peak pulse current (95.7A vs 56.3A) provide additional transient suppression margin without affecting normal circuit operation.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitutes are ROHS3 compliant. Micro Commercial Co parts additionally carry REACH unaffected status.