Equivalent & Substitute Parts for 3KP64C-B TVS Diode

Part Overview

The 3KP64C-B is a Littelfuse transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. This bidirectional Zener diode features a 64V reverse standoff voltage with 108.15V maximum clamping voltage and 29.1A peak pulse current capability in a through-hole P600 axial package. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Substiute Parts

3KP64C-B

LittelfuseIn Stock: 8393KP64C-B Datasheet

Current PartRFQ

5KP64CA-B

Littelfuse Inc.In Stock: 11275KP64CA-B Datasheet

DirectRFQ

15KP64CA-TP

Micro Commercial CoIn Stock: 100015KP64CA-TP Datasheet

MFR RecommendedRFQ

5KP64CA-TP

Micro Commercial CoIn Stock: 6765KP64CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 3KP64C-B is determined by the following critical parameters:

• Voltage - Reverse Standoff: Must match at 64V to ensure proper circuit protection threshold
• Bidirectional Channels: Must remain at 1 channel for equivalent functionality
• Type: Must be Zener diode for identical protection characteristics
• Mounting Type: Must be through-hole to maintain PCB compatibility
• Operating Temperature Range: Must support -55°C to 175°C minimum
• RoHS Compliance: Must maintain ROHS3 compliance for regulatory alignment

The substitute parts are grouped into two categories based on package configuration and manufacturer:

Category 1 - Littelfuse Direct Substitute (P600 Package):

• 5KP64CA-B: Active product with identical P600 axial package, higher power rating (5kW vs 3kW), and increased peak pulse current (49.5A vs 29.1A)

Category 2 - Manufacturer Recommended Alternatives (R-6 Package):

• 15KP64CA-TP and 5KP64CA-TP: Micro Commercial Co alternatives with R-6 axial package, higher power ratings, and active product status

Parameter Comparison

Engineering Selection Recommendations

5KP64CA-B (Littelfuse) is the primary substitute for the 3KP64C-B. This part maintains identical voltage specifications (64V reverse standoff), package form factor (P600 axial), and thermal operating range. The 5KP64CA-B is an active product with ROHS3 compliance and carries higher power dissipation capability (5kW vs 3kW), providing enhanced margin for transient protection. The increased peak pulse current (49.5A vs 29.1A) offers superior performance in the same package footprint.

15KP64CA-TP and 5KP64CA-TP (Micro Commercial Co) are manufacturer-recommended alternatives that meet all critical electrical parameters. These parts use the R-6 axial package instead of P600, requiring PCB layout verification for mechanical fit. Both are active products with ROHS3 compliance. The 15KP64CA-TP provides the highest power rating (15kW), suitable for applications requiring maximum transient suppression capability. The 5KP64CA-TP matches the original 5kW power specification.

All substitute parts maintain the required 64V reverse standoff voltage, bidirectional Zener diode topology, through-hole mounting, and -55°C to 175°C operating temperature range. Selection should prioritize package compatibility with existing PCB designs and application power requirements.

Frequently Asked Questions (FAQ)

Q: Can the 5KP64CA-B directly replace the 3KP64C-B without PCB modifications?

A: Yes. The 5KP64CA-B uses the identical P600 axial package and maintains the same reverse standoff voltage (64V), bidirectional Zener topology, and through-hole mounting. No PCB layout changes are required. The higher power rating (5kW vs 3kW) and increased peak pulse current (49.5A vs 29.1A) provide enhanced protection capability within the same footprint.

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

A: Both are through-hole axial packages for TVS diodes. The P600 package is the original form factor for the 3KP64C-B. The R-6 package used by the Micro Commercial Co alternatives is a different mechanical configuration. PCB hole spacing and lead diameter must be verified before substitution to ensure mechanical compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 5KP64CA-B, 15KP64CA-TP, and 5KP64CA-TP are all ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the original 3KP64C-B specifications.

Q: Why do the Micro Commercial Co parts not specify peak pulse current?

A: Peak pulse current is not provided in the available technical data for the 15KP64CA-TP and 5KP64CA-TP. Selection should be based on the specified power ratings (15kW and 5kW respectively) and the 64V reverse standoff voltage requirement.

Q: Can I use the 15KP64CA-TP for applications originally designed for the 3KP64C-B?

A: Yes, provided PCB package compatibility is verified. The 15KP64CA-TP meets all critical electrical parameters (64V reverse standoff, bidirectional Zener, -55°C to 175°C operating range) and offers significantly higher power dissipation (15kW vs 3kW). The R-6 package requires mechanical fit verification on the PCB.