5KP33-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 5KP33-B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 33V reverse standoff voltage rating with 5000W peak pulse power handling capability in a through-hole P600 axial package. The 5KP33-B is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Substiute Parts

5KP33-B

Littelfuse Inc.In Stock: 9245KP33-B Datasheet

Current PartRFQ

5KP33A

Diotec SemiconductorIn Stock: 43285KP33A Datasheet

DirectRFQ

5KP33A-B

Littelfuse Inc.In Stock: 9185KP33A-B Datasheet

DirectRFQ

SLD33U-017-B

Littelfuse Inc.In Stock: 829SLD33U-017-B 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 eligibility for the 5KP33-B is determined by the following critical parameters:

• Voltage Rating: Reverse standoff voltage of 33V ±tolerance and breakdown voltage minimum of 34.79V or greater
• Power Rating: 5000W peak pulse power handling capability
• Package Compatibility: P600 or R-6 axial through-hole packages
• Electrical Type: Unidirectional zener TVS diode
• Temperature Range: Operating range of -55°C to 175°C or equivalent

All substitute parts listed maintain these core electrical specifications and mechanical compatibility. Variations in clamping voltage (53.3V to 59V range) and peak pulse current remain within acceptable substitution parameters for general-purpose transient suppression applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 5KP33A-B (Littelfuse Inc.)

The 5KP33A-B is the preferred direct substitute for the obsolete 5KP33-B. Both components are manufactured by Littelfuse Inc., share identical package specifications (P600 axial), and maintain the same operating temperature range (-55°C ~ 175°C). The 5KP33A-B is ROHS3 compliant and carries active product status, ensuring long-term availability and supply chain continuity.

Secondary Recommendation: SLD33U-017-B (Littelfuse Inc.)

The SLD33U-017-B provides an automotive-grade alternative with AEC-Q101 qualification. This part maintains electrical equivalence to the 5KP33A-B and is suitable for applications requiring automotive-level reliability and traceability. Both parts share identical electrical parameters and package specifications.

Alternative Recommendation: 5KP33A (Diotec Semiconductor)

The 5KP33A offers active availability with P600 axial packaging. This part operates across a slightly reduced temperature range (-50°C ~ 175°C versus -55°C ~ 175°C) and is suitable for applications where the lower temperature limit is not a critical constraint.

Package Variant: 5KP33A-TP (Micro Commercial Co)

The 5KP33A-TP provides equivalent electrical performance in an R-6 axial package. This variant is applicable only when R-6 package compatibility exists in the circuit design. Direct P600-to-R-6 package substitution requires mechanical and footprint verification.

Higher Clamping Voltage Option: 5KP33E3/TR13 (Microchip Technology)

The 5KP33E3/TR13 features a higher clamping voltage of 59V compared to the 53.3V standard. This part is suitable for applications where increased clamping voltage margin is acceptable or beneficial for system protection strategy.

Frequently Asked Questions (FAQ)

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

A: Yes. The 5KP33A-B is electrically and mechanically compatible with the 5KP33-B. Both components share the same 33V reverse standoff voltage, 5000W power rating, P600 axial package, and -55°C to 175°C operating temperature range. The 5KP33A-B is active and recommended for new designs and obsolescence mitigation.

Q: What is the difference between the clamping voltages listed for different substitute parts?

A: Clamping voltage variation (53.3V to 59V) reflects different manufacturing specifications across suppliers while maintaining the same 33V reverse standoff rating. All listed parts remain within acceptable substitution parameters for general-purpose transient suppression. System design must verify that the specific clamping voltage is compatible with protected circuit requirements.

Q: Is the SLD33U-017-B suitable for automotive applications?

A: Yes. The SLD33U-017-B carries AEC-Q101 automotive qualification and is designated as automotive-grade. This part is appropriate for automotive and mission-critical applications requiring enhanced reliability documentation and traceability.

Q: Can I substitute 5KP33A-TP (R-6 package) for 5KP33-B (P600 package)?

A: Electrical substitution is valid; however, mechanical compatibility must be verified. The R-6 and P600 packages have different physical dimensions and lead spacing. PCB footprint and component placement must accommodate the R-6 package geometry before implementation.

Q: What is the significance of the temperature range difference between 5KP33A (-50°C ~ 175°C) and 5KP33-B (-55°C ~ 175°C)?

A: The 5KP33A operates at a minimum temperature of -50°C, while the 5KP33-B operates at -55°C. For applications requiring operation below -50°C, the 5KP33A is not suitable. The 5KP33A-B, SLD33U-017-B, 5KP33A-TP, and 5KP33E3/TR13 all support the full -55°C lower limit.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance status, ensuring environmental and regulatory alignment with the original 5KP33-B component.