5KP33C-B Equivalent & Substitute Parts

Part Overview

The 5KP33C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional Zener diode 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 part is currently listed as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Substiute Parts

5KP33C-B

Littelfuse Inc.In Stock: 7465KP33C-B Datasheet

Current PartRFQ

5KP33CA

HY Electronic (Cayman) LimitedIn Stock: 118415KP33CA Datasheet

DirectRFQ

5KP33CA-B

Littelfuse Inc.In Stock: 14615KP33CA-B Datasheet

DirectRFQ

SLD33-018-B

Littelfuse Inc.In Stock: 4663SLD33-018-B Datasheet

MFR RecommendedRFQ

5KP33CA-TP

Micro Commercial CoIn Stock: 168145KP33CA-TP Datasheet

MFR RecommendedRFQ

5KP33CE3/TR13

Microchip TechnologyIn Stock: 10835KP33CE3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 5KP33C-B is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 33V (all substitutes maintain this specification)
• Power - Peak Pulse: 5000W (5kW) (all substitutes maintain this specification)
• Mounting Type: Through Hole (all substitutes use through-hole mounting)
• Bidirectional Channels: 1 (all substitutes are single-channel bidirectional devices)
• Type: Zener (all substitutes are Zener-type TVS diodes)

Substitute parts are grouped into two categories based on package compatibility and manufacturer status:

Category 1 - Direct Package Match (P600 Axial): Parts maintaining the original P600 axial package form factor, ensuring mechanical and electrical compatibility without PCB redesign.

Category 2 - Alternative Package (R-6 Axial): Parts using the R-6 axial package, functionally equivalent but with different physical dimensions, requiring PCB layout verification.

All substitutes maintain the 33V reverse standoff voltage and 5000W peak pulse power rating. Variations in clamping voltage (53.3V to 59V) and peak pulse current remain within the functional operating envelope for this device category.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

5KP33CA-B (Littelfuse Inc.) and SLD33-018-B (Littelfuse Inc.) are the preferred substitutes. Both maintain the P600 axial package, ensuring mechanical compatibility without PCB modification. 5KP33CA-B is active production status with bulk packaging availability. SLD33-018-B carries AEC-Q101 automotive qualification and is recommended for applications requiring automotive-grade reliability.

Secondary Substitutes (Package Verification Required)

5KP33CA-TP (Micro Commercial Co) and 5KP33CA (HY Electronic) use the R-6 axial package. These parts are functionally equivalent but require PCB layout verification due to different physical dimensions. 5KP33CA-TP is available in cut tape packaging with the highest inventory availability.

Alternative Substitute (Clamping Voltage Consideration)

5KP33CE3/TR13 (Microchip Technology) maintains P600 package compatibility but specifies a 59V maximum clamping voltage compared to 53.3V in other substitutes. This part is suitable where higher clamping voltage tolerance is acceptable within circuit design parameters.

All substitute parts maintain ROHS3 compliance and the 5000W peak pulse power rating. Selection should prioritize package compatibility and production status requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 5KP33CA-B as a direct replacement for 5KP33C-B?

A: Yes. 5KP33CA-B is a direct substitute. Both parts share the P600 axial package, 33V reverse standoff voltage, and 5000W peak pulse power rating. The primary difference is that 5KP33CA-B is in active production status, whereas 5KP33C-B is obsolete.

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

A: Both are axial through-hole packages for TVS diodes. P600 and R-6 differ in physical dimensions and lead spacing. Parts using R-6 packages (5KP33CA-TP, 5KP33CA) require PCB layout verification to confirm compatibility with existing footprints designed for P600.

Q: Does the clamping voltage difference between 53.3V and 59V affect substitution?

A: Clamping voltage is a secondary parameter. All substitutes maintain the 33V reverse standoff voltage and 5000W power rating. The 5KP33CE3/TR13 with 59V clamping voltage is functionally equivalent but should be verified against circuit design requirements for overvoltage protection thresholds.

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the original 5KP33C-B.

Q: Which substitute has the best availability?

A: 5KP33CA-TP (Micro Commercial Co) has the highest inventory availability at 16,757 pieces in stock. For P600 package preference, 5KP33CA-B (Littelfuse Inc.) has 1,418 pieces available.

Q: Is SLD33-018-B suitable for automotive applications?

A: Yes. SLD33-018-B carries AEC-Q101 automotive qualification and is designated as automotive-grade, making it suitable for automotive circuit protection applications.