3KP7.5 Equivalent & Substitute Parts

Part Overview

The 3KP7.5 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 7.5V reverse standoff voltage with a 14.65V maximum clamping voltage and 232.6A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making equivalent substitute parts necessary for new designs and ongoing system maintenance.

Substiute Parts

3KP7.5

Littelfuse Inc.In Stock: 9413KP7.5 Datasheet

Current PartRFQ

5KP7.5A

Littelfuse Inc.In Stock: 53045KP7.5A Datasheet

DirectRFQ

5KP7.5A-TP

Micro Commercial CoIn Stock: 10325KP7.5A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP7.5 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must be 7.5V to maintain circuit protection threshold
• Unidirectional Channels: Must remain 1 channel
• Mounting Type: Must be Through Hole for PCB compatibility
• Operating Temperature Range: Must support -55°C ~ 175°C (TJ)
• RoHS Compliance: Must maintain ROHS3 Compliant status

Substitute parts are grouped based on matching these core electrical and mechanical specifications. Package variations (P600 vs. R-6) are acceptable provided the axial through-hole form factor is maintained and electrical performance meets or exceeds the original specification.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain active product status and full ROHS3 compliance, ensuring regulatory and supply chain continuity.

5KP7.5A (Littelfuse Inc.) is the primary substitute. It maintains the same manufacturer lineage as the original 3KP7.5, uses the identical P600 axial package, and provides enhanced electrical performance with 5000W peak pulse power versus the original 3000W. The lower clamping voltage (12.9V vs. 14.65V) and higher peak pulse current (395.3A vs. 232.6A) represent improved protection characteristics within the same voltage class.

5KP7.5A-TP (Micro Commercial Co) is an alternative substitute with equivalent electrical specifications to the 5KP7.5A. The R-6 axial package is mechanically compatible with P600 footprints in through-hole applications. Peak pulse current is not specified for this part; verification against application requirements is necessary if peak current handling is a critical design parameter.

Frequently Asked Questions (FAQ)

Q: Can the 5KP7.5A directly replace the 3KP7.5 in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (7.5V), unidirectional channel configuration, operating temperature range, and through-hole mounting type. The P600 package footprint is identical. The 5KP7.5A provides higher power dissipation (5000W vs. 3000W) and lower clamping voltage, making it functionally superior for the same application.

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

A: Both are axial through-hole packages suitable for the same PCB footprint. P600 and R-6 are different package designations from different manufacturers but maintain compatible physical dimensions for axial component placement.

Q: Why is the clamping voltage lower in the substitute parts?

A: The 5KP7.5A and 5KP7.5A-TP both clamp at 12.9V versus the original 14.65V. This represents improved transient suppression performance within the same 7.5V voltage class and is acceptable for circuit protection applications.

Q: Is the 5KP7.5A-TP suitable if peak pulse current is not specified?

A: The 5KP7.5A-TP shares the same 5000W peak pulse power rating as the 5KP7.5A. If peak pulse current (Ipp) is a critical design parameter for your application, the 5KP7.5A with specified 395.3A Ipp is the recommended choice.

Q: Are both substitutes RoHS compliant?

A: Yes. Both the 5KP7.5A and 5KP7.5A-TP are ROHS3 Compliant, matching the original 3KP7.5 compliance status.