3KP75A-B Equivalent & Substitute Parts

Part Overview

The 3KP75A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 75V reverse standoff voltage with a 121V maximum clamping voltage and 24.8A peak pulse current capability. The part is classified as obsolete, making identification of suitable equivalent and substitute components essential for ongoing system support and new design implementations.

Substiute Parts

3KP75A-B

Littelfuse Inc.In Stock: 12123KP75A-B Datasheet

Current PartRFQ

5KP75A-B

Littelfuse Inc.In Stock: 7955KP75A-B Datasheet

DirectRFQ

3KP75A-TP

Micro Commercial CoIn Stock: 12223KP75A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP75A-B is determined by the following critical parameters:

• Voltage Rating Match: Reverse standoff voltage of 75V, breakdown voltage minimum of 83.3V, and clamping voltage maximum of 121V must be maintained
• Current Capability: Peak pulse current rating must meet or exceed 24.8A at the 10/1000µs pulse profile
• Power Dissipation: Peak pulse power rating must support 3000W minimum
• Mounting Configuration: Through-hole axial package required for mechanical compatibility
• Temperature Range: Operating range of -55°C to 175°C (TJ) must be supported
• Regulatory Compliance: ROHS3 compliance required

Two substitute parts meet these criteria with varying performance characteristics and manufacturer sources.

Parameter Comparison

Engineering Selection Recommendations

5KP75A-B (Littelfuse Inc.): This substitute is manufactured by the original equipment manufacturer and maintains active product status. It provides enhanced current handling capability at 42.1A and increased power dissipation at 5000W, exceeding the original specification. The identical voltage ratings and temperature range ensure direct functional compatibility. The P600 axial package matches the original mechanical footprint. ROHS3 compliance is maintained.

3KP75A-TP (Micro Commercial Co): This substitute matches the original electrical specifications exactly, including 24.8A peak pulse current and 3000W power dissipation. Active product status ensures continued availability. The R-6 axial package differs from the original P600 package, requiring mechanical verification for board layout compatibility. REACH compliance status is unaffected. This option provides electrical equivalence with alternative packaging.

Frequently Asked Questions (FAQ)

Q: Can the 5KP75A-B be used as a direct replacement for the 3KP75A-B?

A: Yes. The 5KP75A-B maintains identical voltage ratings (75V standoff, 83.3V breakdown, 121V clamping) and operating temperature range. The increased current rating (42.1A vs 24.8A) and power dissipation (5000W vs 3000W) provide enhanced performance margins. The P600 axial package is mechanically identical. This is a performance-enhanced substitute.

Q: What is the difference between the 3KP75A-TP and the original 3KP75A-B?

A: Electrical specifications are identical: 75V standoff voltage, 83.3V breakdown voltage, 121V clamping voltage, 24.8A peak pulse current, and 3000W power dissipation. The primary difference is the package designation (R-6 vs P600 axial). Both are through-hole axial configurations, but physical dimensions may differ. Verify board layout compatibility before substitution.

Q: Why is the 3KP75A-B listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Littelfuse Inc. The 5KP75A-B and 3KP75A-TP are active alternatives that provide equivalent or enhanced functionality for new designs and system support.

Q: Are all three parts ROHS3 compliant?

A: The 3KP75A-B and 5KP75A-B are explicitly ROHS3 compliant. The 3KP75A-TP has REACH unaffected status, which does not conflict with ROHS3 requirements for this component category.

Q: Can I use the 5KP75A-B in a space-constrained application?

A: The 5KP75A-B uses the same P600 axial package as the original 3KP75A-B, so physical dimensions are identical. Space constraints are not affected by this substitution.