3KP7.5CA-B Equivalent & Substitute Parts

Part Overview

The 3KP7.5CA-B is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage protection applications. This bidirectional Zener diode features a 7.5V reverse standoff voltage and 12.9V maximum clamping voltage, with a peak pulse current rating of 232.6A and 3000W peak pulse power dissipation. The component is mounted through-hole in a P600 axial package.

The 3KP7.5CA-B is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

3KP7.5CA-B

Littelfuse Inc.In Stock: 8173KP7.5CA-B Datasheet

Current PartRFQ

5KP7.5CA-B

Littelfuse Inc.In Stock: 10715KP7.5CA-B Datasheet

DirectRFQ

3KP7.5CA-TP

Micro Commercial CoIn Stock: 12373KP7.5CA-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3KP7.5CA-B are identified based on strict electrical and mechanical compatibility criteria. The following parameters must match or remain within acceptable tolerances for substitution:

• Voltage - Reverse Standoff (Typ): 7.5V
• Voltage - Breakdown (Min): 8.33V
• Voltage - Clamping (Max) @ Ipp: 12.9V
• Bidirectional Channels: 1
• Type: Zener
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Mounting Type: Through Hole
• Applications: General Purpose

Substitute parts are grouped into two categories:

Category 1: Higher Power Rating Substitutes – Parts with identical voltage specifications but increased peak pulse current and power dissipation capacity, suitable for applications requiring enhanced transient protection.

Category 2: Alternative Packaging Substitutes – Parts with identical electrical specifications but different axial package designations, maintaining electrical equivalence while accommodating different PCB layouts or mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

5KP7.5CA-B (Littelfuse Inc.) – This substitute is the preferred choice for new designs and production continuity. It maintains identical voltage specifications (7.5V reverse standoff, 12.9V clamping) and operating temperature range while offering increased peak pulse current (395.3A) and power dissipation (5000W). The component is manufactured by the original equipment supplier, carries Active product status, and is ROHS3 compliant. The P600 axial package is mechanically identical to the original part, requiring no PCB layout modifications.

3KP7.5CA-TP (Micro Commercial Co) – This substitute provides electrical equivalence with identical voltage and current specifications (232.6A peak pulse, 3000W power dissipation). It is manufactured by an alternative supplier and carries Active product status. The R-6 axial package differs mechanically from the original P600 package, requiring verification of PCB footprint compatibility and lead spacing before implementation. REACH compliance status is unaffected; RoHS status is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can the 5KP7.5CA-B be used as a direct replacement for the 3KP7.5CA-B?

A: Yes. The 5KP7.5CA-B is electrically equivalent with identical voltage specifications and operating temperature range. The P600 axial package is mechanically identical, requiring no PCB modifications. The increased peak pulse current (395.3A vs. 232.6A) and power rating (5000W vs. 3000W) provide enhanced transient protection capability.

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

A: Both are axial through-hole packages for TVS diodes. The P600 and R-6 designations indicate different mechanical dimensions and lead spacing. PCB footprint compatibility must be verified before substituting 3KP7.5CA-TP (R-6 package) for the original 3KP7.5CA-B (P600 package).

Q: Are all substitute parts RoHS compliant?

A: The 5KP7.5CA-B is ROHS3 compliant. The 3KP7.5CA-TP RoHS status is not specified in available technical documentation and should be confirmed with the manufacturer before use in applications requiring RoHS compliance.

Q: Why is the 3KP7.5CA-B classified as obsolete?

A: The 3KP7.5CA-B has been discontinued by Littelfuse Inc. The 5KP7.5CA-B serves as the active replacement, offering improved performance specifications while maintaining electrical compatibility.

Q: Can voltage specifications vary between substitute parts?

A: No. All substitute parts listed maintain identical voltage specifications: 7.5V reverse standoff voltage, 8.33V minimum breakdown voltage, and 12.9V maximum clamping voltage. Voltage compatibility is a mandatory substitution criterion.