5KP33 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The Littelfuse 5KP33 is a unidirectional transient voltage suppressor diode designed for general-purpose overvoltage protection applications. This component operates at a 33V reverse standoff voltage with a 5000W peak pulse power rating and is housed in a P600 axial through-hole package. The 5KP33 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. Active alternatives with comparable electrical characteristics and mechanical compatibility are available from multiple manufacturers.

Substiute Parts

5KP33

LittelfuseIn Stock: 7465KP33 Datasheet

Current PartRFQ

5KP33A

Diotec SemiconductorIn Stock: 43285KP33A Datasheet

DirectRFQ

SLD33U-017-B

Littelfuse Inc.In Stock: 829SLD33U-017-B Datasheet

MFR RecommendedRFQ

15KP33A-TP

Micro Commercial CoIn Stock: 116015KP33A-TP Datasheet

MFR RecommendedRFQ

30KP33A-TP

Micro Commercial CoIn Stock: 88430KP33A-TP Datasheet

MFR RecommendedRFQ

3KP33A-TP

Micro Commercial CoIn Stock: 24203KP33A-TP Datasheet

MFR RecommendedRFQ

5KP33A-TP

Micro Commercial CoIn Stock: 12205KP33A-TP Datasheet

MFR RecommendedRFQ

5KP33E3/TR13

Microchip TechnologyIn Stock: 8505KP33E3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 5KP33 is determined by the following critical parameters:

• Voltage Rating: Reverse standoff voltage of 33V and breakdown voltage minimum of 34.79V
• Power Dissipation: Peak pulse power of 5000W (5kW)
• Package Compatibility: Through-hole axial mounting in P600 or equivalent package footprint
• Electrical Type: Unidirectional zener TVS diode with single channel
• Temperature Range: Operating range of -55°C to 175°C
• Compliance: ROHS3 compliance for environmental standards

Substitute parts must maintain the 33V voltage class, support 5000W peak pulse power, and use compatible through-hole axial packaging. Clamping voltage variations within the specified range are acceptable provided breakdown and standoff voltages remain within tolerance.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (P600 Package, 5000W Rating):

The SLD33U-017-B from Littelfuse Inc. and 5KP33E3/TR13 from Microchip Technology are the primary direct replacements for the 5KP33. Both maintain P600 axial packaging, 5000W peak pulse power, and ROHS3 compliance. The SLD33U-017-B includes AEC-Q101 automotive qualification and extends the operating temperature range to match the original specification (-55°C to 175°C). The 5KP33E3/TR13 is supplied in tape and reel packaging and maintains full compliance with ROHS3 and REACH standards.

Alternative with Same Voltage and Power (Different Package):

The 5KP33A-TP from Micro Commercial Co provides electrical equivalence with 5000W peak pulse power and 33V voltage rating but uses R-6 axial packaging instead of P600. This part is active and ROHS3 compliant. Physical footprint differences must be evaluated for PCB compatibility.

Lower Power Alternatives (3000W):

The 3KP33A-TP from Micro Commercial Co maintains 33V voltage rating and R-6 axial packaging but is rated for 3000W peak pulse power. This part is suitable only for applications where the 5000W power requirement can be reduced.

Higher Power Alternatives (15000W and 30000W):

The 15KP33A-TP and 30KP33A-TP from Micro Commercial Co provide increased power dissipation capability (15000W and 30000W respectively) with R-6 axial packaging. These parts are suitable for applications requiring enhanced transient protection beyond the original 5000W specification.

Cross-Manufacturer Option (Diotec Semiconductor):

The 5KP33A from Diotec Semiconductor offers P600 axial packaging and 5000W power rating with 33V voltage class. Operating temperature range is -50°C to 175°C, which is narrower than the original specification at the lower end.

Frequently Asked Questions (FAQ)

Q: Can I use 5KP33A-TP as a direct replacement for 5KP33?

A: The 5KP33A-TP maintains electrical equivalence (33V rating, 5000W power) but uses R-6 axial packaging instead of P600. Physical compatibility with existing PCB layouts must be confirmed before substitution.

Q: What is the difference between P600 and R-6 packages?

A: Both are through-hole axial packages for TVS diodes. P600 and R-6 differ in physical dimensions and lead spacing. PCB footprint compatibility must be verified for each application.

Q: Is SLD33U-017-B a suitable replacement for the obsolete 5KP33?

A: Yes. The SLD33U-017-B maintains P600 packaging, 33V voltage rating, 5000W power dissipation, and ROHS3 compliance. It extends the operating temperature range to -55°C to 175°C and includes AEC-Q101 automotive qualification.

Q: Can I use a higher power-rated part like 15KP33A-TP or 30KP33A-TP?

A: Higher power-rated parts (15000W and 30000W) maintain the 33V voltage class and are electrically compatible. However, they use R-6 packaging instead of P600. Selection depends on application requirements and PCB layout constraints.

Q: What compliance certifications are important for my application?

A: All recommended active substitutes are ROHS3 compliant. The SLD33U-017-B includes AEC-Q101 automotive qualification if automotive-grade components are required. REACH compliance status is documented for each part in the parameter comparison table.

Q: Does operating temperature range affect part selection?

A: The original 5KP33 operates from -55°C to 175°C. Most active substitutes maintain this range. The 5KP33A from Diotec Semiconductor has a narrower range (-50°C to 175°C) and should be used only if the lower temperature limit of -50°C is acceptable for your application.

Q: Are there inventory considerations for these substitutes?

A: Multiple substitutes are available in active production with documented inventory levels. SLD33U-017-B (794 pcs), 5KP33E3/TR13 (773 pcs), and 5KP33A-TP (1180 pcs) are readily available. Diotec 5KP33A has higher inventory (4300 pcs).