3KP7.5A Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 3KP7.5A is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage clamping applications. This component features a 7.5V reverse standoff voltage with a 12.9V maximum clamping voltage and 232.6A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

3KP7.5A

Littelfuse Inc.In Stock: 8943KP7.5A Datasheet

Current PartRFQ

5KP7.5A

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

DirectRFQ

3KP7.5A-TP

Micro Commercial CoIn Stock: 9163KP7.5A-TP Datasheet

DirectRFQ

5KP7.5A-TP

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP7.5A is determined by the following critical parameters that must remain constant across all equivalent parts:

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

Substitute parts are grouped into two categories based on package compatibility and manufacturer availability. The first group maintains the original P600 axial package, while the second group uses the R-6 axial package variant. Both package types are through-hole axial configurations suitable for the same circuit board layouts with standard component spacing.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete 3KP7.5A, the following selection criteria apply:

Direct Replacement (Same Package - P600): The 5KP7.5A from Littelfuse Inc. maintains identical voltage specifications and the original P600 axial package. This part is in active production status with ROHS3 compliance. The 5KP7.5A provides higher peak pulse current (395.3A) and power dissipation (5000W) compared to the original specification, making it suitable for equivalent or higher-stress applications.

Alternative Replacement (R-6 Package): The 3KP7.5A-TP from Micro Commercial Co provides identical electrical specifications to the original part with matching 232.6A peak pulse current and 3000W power rating. This part uses the R-6 axial package variant and is in active production status. The 5KP7.5A-TP from Micro Commercial Co offers higher power capability (5000W) in the R-6 package configuration and is the manufacturer-recommended substitute, with active product status and ROHS3 compliance.

All substitute parts maintain the critical voltage parameters (7.5V reverse standoff, 12.9V clamping) and operating temperature range required for functional equivalence.

Frequently Asked Questions (FAQ)

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

A: Yes. The 5KP7.5A maintains identical voltage specifications (7.5V reverse standoff, 12.9V clamping) and uses the same P600 axial through-hole package. The higher peak pulse current (395.3A vs. 232.6A) and power rating (5000W vs. 3000W) make it suitable for equivalent or higher-stress applications with the same circuit board layout.

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

A: Both P600 and R-6 are through-hole axial package configurations. The primary difference is the physical package variant designation. Both are compatible with standard through-hole circuit board layouts. Component spacing and lead diameter may vary slightly between variants, but both accommodate typical axial component mounting practices.

Q: Is the 3KP7.5A-TP electrically identical to the original 3KP7.5A?

A: Yes. The 3KP7.5A-TP from Micro Commercial Co maintains identical electrical specifications including voltage ratings (7.5V reverse standoff, 12.9V clamping), peak pulse current (232.6A), and power dissipation (3000W). The primary difference is the package variant (R-6 vs. P600) and manufacturer.

Q: Why does the 5KP7.5A-TP not specify peak pulse current?

A: The peak pulse current specification is not provided in the available data for the 5KP7.5A-TP. However, the 5000W power rating at the same 12.9V clamping voltage indicates higher current handling capability than the 3000W-rated parts. Detailed specifications should be obtained from the manufacturer datasheet for precise current values.

Q: Are all substitute parts RoHS compliant?

A: The 5KP7.5A and 5KP7.5A-TP are confirmed ROHS3 compliant. The 3KP7.5A-TP RoHS status is not specified in the available data. Compliance verification should be confirmed with the supplier or manufacturer datasheet for the 3KP7.5A-TP if RoHS certification is required for your application.

Q: Can I use a higher power-rated part (5KP series) in place of the original 3KP7.5A?

A: Yes. The 5KP7.5A and 5KP7.5A-TP maintain the same voltage specifications as the original part. The increased power rating (5000W vs. 3000W) provides additional margin for transient suppression without affecting circuit compatibility, provided the same voltage clamping characteristics are maintained.