Equivalent & Substitute Parts for 3KP28A TVS Diode

Part Overview

The 3KP28A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This component features a 28V reverse standoff voltage with a 45.4V maximum clamping voltage and 66.1A peak pulse current capability in a P600 axial through-hole package. The 3KP28A is currently classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

3KP28A

Littelfuse Inc.In Stock: 10843KP28A Datasheet

Current PartRFQ

5KP28A

Littelfuse Inc.In Stock: 149105KP28A Datasheet

DirectRFQ

3KP28A-TP

Micro Commercial CoIn Stock: 19123KP28A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP28A is determined by the following critical parameters:

• Voltage Rating Match: Reverse standoff voltage of 28V, breakdown voltage minimum of 31.1V, and clamping voltage maximum of 45.4V must be maintained
• Package Compatibility: Through-hole axial mounting with P600 or equivalent package designation
• Unidirectional Configuration: Single-channel zener diode topology
• Temperature Range: Operating range of -55°C to 175°C (TJ)
• RoHS Compliance: ROHS3 compliant status required

The 5KP28A and 3KP28A-TP meet these substitution criteria while offering enhanced or equivalent electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

5KP28A (Littelfuse Inc.): This substitute is the preferred choice for new designs and procurement. It maintains identical voltage specifications and operating temperature range while providing enhanced peak pulse current (112.3A versus 66.1A) and power dissipation capability (5000W versus 3000W). The 5KP28A is actively manufactured and ROHS3 compliant, ensuring long-term availability and regulatory compliance.

3KP28A-TP (Micro Commercial Co): This substitute maintains the original 3000W power rating and identical voltage specifications. The R-6 axial package is mechanically compatible with P600 through-hole mounting applications. The 3KP28A-TP is actively manufactured and ROHS3 compliant. Peak pulse current is not specified for this variant.

Both substitutes are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original component's environmental and regulatory status.

Frequently Asked Questions (FAQ)

Q: Can the 5KP28A directly replace the 3KP28A in existing designs?

A: Yes. The 5KP28A maintains all critical voltage parameters (28V standoff, 31.1V breakdown minimum, 45.4V clamping maximum) and operating temperature range. The higher peak pulse current (112.3A) and power rating (5000W) provide enhanced transient protection capability without compromising circuit compatibility.

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

A: Both are axial through-hole packages for TVS diodes. The P600 and R-6 designations refer to different package geometries and lead configurations. Physical dimensions and lead spacing may differ; verify mechanical compatibility with your PCB layout before substitution.

Q: Why is the 3KP28A obsolete?

A: The 3KP28A has been discontinued by Littelfuse Inc. The 5KP28A series provides superior performance characteristics and remains in active production, making it the recommended long-term replacement.

Q: Are all substitutes RoHS compliant?

A: Yes. Both the 5KP28A and 3KP28A-TP are ROHS3 compliant, matching the original 3KP28A specification.

Q: What if my application requires the exact 3000W power rating?

A: The 3KP28A-TP maintains the 3000W power specification. However, the 5KP28A's 5000W capability provides additional margin for transient events without introducing compatibility issues in standard applications.