3KP7.5A-B Equivalent & Substitute Parts

Part Overview

The 3KP7.5A-B is a through-hole 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 and 12.9V maximum clamping voltage with 232.6A peak pulse current capability. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement.

Substiute Parts

3KP7.5A-B

Littelfuse Inc.In Stock: 9473KP7.5A-B Datasheet

Current PartRFQ

5KP7.5A-B

Littelfuse Inc.In Stock: 9225KP7.5A-B 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

Substitute parts for the 3KP7.5A-B are grouped based on matching electrical characteristics and mechanical compatibility. The primary substitution criteria are:

• Voltage - Reverse Standoff: 7.5V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 12.9V (exact match required)
• Operating Temperature Range: -55°C to 175°C (exact match required)
• Mounting Type: Through Hole (exact match required)
• Type: Zener, Unidirectional (exact match required)

Substitutes are categorized into two groups:

Group 1: Direct Electrical Equivalents (Same Power Rating)

• 3KP7.5A-TP (Micro Commercial Co): Identical electrical specifications and 3000W power rating; package variant R-6 instead of P600

Group 2: Enhanced Performance Alternatives (Higher Power Rating)

• 5KP7.5A-B (Littelfuse Inc.): Identical voltage and clamping characteristics; 5000W power rating (67% higher); same P600 package
• 5KP7.5A-TP (Micro Commercial Co): Identical voltage and clamping characteristics; 5000W power rating; R-6 package variant

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select 3KP7.5A-TP when package footprint compatibility with R-6 axial configuration is acceptable. This part maintains identical electrical performance and is currently in active production status, ensuring long-term availability.

For Enhanced Reliability (Higher Power Margin): Select 5KP7.5A-B or 5KP7.5A-TP when circuit design permits higher power dissipation capability. The 5KP series provides 67% additional peak pulse power (5000W vs. 3000W) while maintaining identical voltage regulation characteristics. Both 5KP variants are in active production and ROHS3 compliant.

Package Considerations:

• P600 package (3KP7.5A-B, 5KP7.5A-B): Original package footprint
• R-6 package (3KP7.5A-TP, 5KP7.5A-TP): Alternative axial package; verify PCB layout compatibility

All substitute options maintain the required operating temperature range (-55°C to 175°C) and unidirectional zener configuration.

Frequently Asked Questions (FAQ)

Q: Can 3KP7.5A-TP replace 3KP7.5A-B directly? A: Electrically yes. Both parts have identical voltage ratings (7.5V standoff, 12.9V clamping) and power dissipation (3000W). The primary difference is the package: 3KP7.5A-TP uses R-6 axial configuration instead of P600. Verify PCB footprint compatibility before substitution.

Q: What is the advantage of using 5KP7.5A-B or 5KP7.5A-TP? A: The 5KP series provides higher peak pulse power rating (5000W vs. 3000W) while maintaining identical voltage regulation. This offers greater thermal margin and surge handling capability for the same voltage protection level. Use when circuit design allows higher power dissipation or when additional safety margin is required.

Q: Are all substitute parts RoHS compliant? A: 3KP7.5A-B, 5KP7.5A-B, and 5KP7.5A-TP are ROHS3 compliant. Compliance status for 3KP7.5A-TP is not specified in available documentation.

Q: Why is 3KP7.5A-B obsolete? A: The original part is classified as obsolete by the manufacturer. Active alternatives (3KP7.5A-TP, 5KP7.5A-B, 5KP7.5A-TP) provide equivalent or enhanced functionality and ensure continued design support and procurement availability.

Q: Can I use a 5KP series part in place of a 3KP series part? A: Yes. The 5KP series maintains identical voltage characteristics (7.5V standoff, 12.9V clamping) and operating temperature range. The higher power rating (5000W vs. 3000W) is a non-limiting enhancement. Verify package compatibility with your PCB layout.

Q: What is the difference between Littelfuse and Micro Commercial Co versions? A: Both manufacturers produce functionally equivalent parts meeting the same electrical specifications. Littelfuse offers P600 package options; Micro Commercial Co offers R-6 package options. Selection depends on PCB footprint requirements and supplier availability.