Equivalent & Substitute Parts for 3KP7.5-B TVS Diode

Part Overview

The 3KP7.5-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose transient voltage protection applications. This component features a 7.5V reverse standoff voltage, 14.65V maximum clamping voltage, and 232.6A peak pulse current capability in a through-hole P600 axial package. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

3KP7.5-B

LittelfuseIn Stock: 7783KP7.5-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

MFR RecommendedRFQ

5KP7.5A-TP

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP7.5-B is determined by the following critical parameters:

• Voltage - Reverse Standoff: 7.5V (exact match required)
• Voltage - Clamping (Max) @ Ipp: tolerance range 12.9V to 14.65V
• Current - Peak Pulse (10/1000µs): minimum 232.6A
• Power - Peak Pulse: minimum 3000W
• Operating Temperature Range: -55°C to 175°C (minimum requirement)
• Mounting Type: Through Hole
• Type: Zener, Unidirectional

Substitute parts are grouped into two categories based on package compatibility and manufacturer status:

Category 1: Same Package (P600) - Direct Mechanical Substitutes

• 5KP7.5A-B (Littelfuse): Higher power rating (5kW), same P600 package, active product status

Category 2: Alternative Package (R-6) - Functional Equivalents

• 3KP7.5A-TP (Micro Commercial Co): Matched power rating (3kW), R-6 package, active product status
• 5KP7.5A-TP (Micro Commercial Co): Higher power rating (5kW), R-6 package, active product status

Parameter Comparison

Engineering Selection Recommendations

For P600 Package Requirement (Direct Footprint Compatibility): The 5KP7.5A-B from Littelfuse is the primary substitute when P600 axial package compatibility is mandatory. This part maintains identical reverse standoff voltage (7.5V), meets clamping voltage specifications (12.9V within tolerance), and provides enhanced peak pulse current (395.3A) and power dissipation (5kW) compared to the original 3KP7.5-B. The part carries active product status and ROHS3 compliance certification.

For Functional Equivalence with Package Flexibility: When PCB layout permits alternative packaging, the 3KP7.5A-TP from Micro Commercial Co provides matched electrical performance (3kW power rating, 232.6A peak pulse current) in an R-6 axial package. This part is actively manufactured and REACH compliant.

For Enhanced Performance with Package Flexibility: The 5KP7.5A-TP from Micro Commercial Co offers the highest power dissipation capability (5kW) in an R-6 package with active product status and ROHS3 compliance. This option is suitable when design margins for transient energy absorption are prioritized.

All substitute options maintain the required operating temperature range (-55°C to 175°C), unidirectional Zener topology, and general-purpose application suitability of the original 3KP7.5-B.

Frequently Asked Questions (FAQ)

Q: Can the 5KP7.5A-B replace the 3KP7.5-B in existing designs? A: Yes, provided the P600 axial package footprint is compatible with your PCB layout. The 5KP7.5A-B maintains identical reverse standoff voltage (7.5V) and clamping voltage specifications (12.9V), with superior current and power handling capabilities. No circuit redesign is required.

Q: What is the difference between the 3KP and 5KP series? A: The primary difference is power dissipation rating. The 3KP series is rated for 3000W peak pulse power, while the 5KP series is rated for 5000W. Both series share identical voltage specifications (7.5V reverse standoff) and are suitable for the same protection applications, with the 5KP offering greater transient energy absorption capacity.

Q: Are the R-6 and P600 packages mechanically interchangeable? A: No. R-6 and P600 are distinct axial package formats with different physical dimensions. PCB footprints must be verified before substitution. Both are through-hole axial packages suitable for wave soldering and manual insertion.

Q: Do all substitute parts meet RoHS compliance? A: The 5KP7.5A-B and 5KP7.5A-TP are explicitly ROHS3 compliant. The 3KP7.5A-TP compliance status is not specified in available documentation and should be verified with the manufacturer if RoHS certification is a design requirement.

Q: What is the impact of the different clamping voltages (14.65V vs 12.9V)? A: The 3KP7.5-B clamps at a maximum of 14.65V, while substitute parts clamp at 12.9V. This represents a 0.65V reduction in peak transient voltage, which provides improved protection margins in most applications. Verify that your protected circuit can tolerate the lower clamping voltage threshold.

Q: Is the 3KP7.5A-TP from Micro Commercial Co a direct equivalent? A: The 3KP7.5A-TP provides electrical equivalence (3kW power rating, 232.6A peak pulse current, 7.5V reverse standoff) but uses an R-6 package instead of P600. It is actively manufactured and suitable for new designs when package flexibility exists.