Equivalent & Substitute Parts for 3KP28C

Part Overview

The 3KP28C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage protection applications. This bidirectional zener diode features a 28V reverse standoff voltage with a 47.67V maximum clamping voltage and 66.1A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within the specified electrical and mechanical parameters.

Substiute Parts

3KP28C

Littelfuse Inc.In Stock: 8853KP28C Datasheet

Current PartRFQ

5KP28CA

Diotec SemiconductorIn Stock: 68405KP28CA Datasheet

DirectRFQ

15KP28CA-TP

Micro Commercial CoIn Stock: 109215KP28CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP28C is determined by the following critical parameters:

• Voltage - Reverse Standoff: Must be 28V (nominal)
• Voltage - Breakdown (Min): Must fall within acceptable range (29.48V minimum for 3KP28C)
• Voltage - Clamping (Max) @ Ipp: Must not exceed application limits
• Current - Peak Pulse: Must meet or exceed 66.1A requirement
• Power - Peak Pulse: Must meet or exceed 3000W requirement
• Package / Case: Must be through-hole axial configuration
• Type: Must be bidirectional zener TVS diode

The identified substitute parts meet these criteria while offering active product status and improved availability compared to the obsolete 3KP28C.

Parameter Comparison

Engineering Selection Recommendations

5KP28CA (Diotec Semiconductor): This substitute maintains the P600 axial package configuration and 28V standoff voltage specification. It exceeds the peak pulse current requirement (110A vs. 66.1A) and power dissipation capability (5000W vs. 3000W). The lower temperature minimum (-50°C vs. -55°C) represents a minor constraint for applications requiring full -55°C operation. This part is currently active with substantial inventory availability.

15KP28CA-TP (Micro Commercial Co): This substitute provides the highest power dissipation rating (15000W) and maintains full temperature range compatibility (-55°C to 175°C). The R-6 axial package differs from the P600 configuration but remains a through-hole axial form factor. RoHS3 compliance and active product status support long-term supply chain reliability. Peak pulse current specification is not provided for this part.

For applications where the P600 package footprint is critical, the 5KP28CA is the direct mechanical equivalent. For applications prioritizing maximum power handling and temperature range, the 15KP28CA-TP is suitable provided the R-6 package dimensions are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 5KP28CA directly replace the 3KP28C in existing designs?

A: The 5KP28CA maintains identical voltage specifications (28V standoff) and uses the same P600 axial through-hole package. The higher current and power ratings provide margin above the 3KP28C requirements. The operating temperature minimum is -50°C rather than -55°C; verify this meets application requirements.

Q: What is the primary difference between the 5KP28CA and 15KP28CA-TP?

A: Both parts share the 28V standoff voltage specification. The 15KP28CA-TP offers significantly higher power dissipation (15000W vs. 5000W) and uses an R-6 axial package instead of P600. The 15KP28CA-TP maintains the full -55°C to 175°C temperature range. Package dimensions differ; verify PCB layout compatibility before selection.

Q: Are there mechanical compatibility concerns with package substitution?

A: The 5KP28CA uses the P600 package (same as 3KP28C) and requires no layout modifications. The 15KP28CA-TP uses the R-6 package, which has different physical dimensions. Verify lead spacing, body diameter, and PCB hole sizing before implementing this substitute in existing designs.

Q: What compliance certifications apply to these substitute parts?

A: The 3KP28C and 15KP28CA-TP are both ROHS3 compliant. The 5KP28CA RoHS status is not applicable per the manufacturer specification. All three parts carry EAR99 ECCN classification.

Q: Which substitute part should be selected for new designs?

A: For new designs, either active substitute is acceptable based on application requirements. The 5KP28CA provides direct package compatibility with the obsolete 3KP28C. The 15KP28CA-TP offers superior power handling and full temperature range operation at the cost of package reconfiguration.