3KP28CA-B Equivalent & Substitute Parts

Part Overview

The 3KP28CA-B is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage 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 through-hole P600 axial package. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

3KP28CA-B

Littelfuse Inc.In Stock: 8153KP28CA-B Datasheet

Current PartRFQ

5KP28CA-B

Littelfuse Inc.In Stock: 10765KP28CA-B Datasheet

DirectRFQ

15KP28CA-TP

Micro Commercial CoIn Stock: 109215KP28CA-TP Datasheet

MFR RecommendedRFQ

3KP28CA-TP

Micro Commercial CoIn Stock: 8463KP28CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3KP28CA-B are identified based on the following critical electrical and mechanical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 28V
• Voltage - Breakdown (Min): 31.1V
• Bidirectional Channels: 1
• Type: Zener
• Mounting Type: Through Hole
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Applications: General Purpose

Secondary Compatibility Parameters:

• Voltage - Clamping (Max) @ Ipp: 45.4V (allowable tolerance range)
• Current - Peak Pulse (10/1000µs): 66.1A (minimum requirement)
• Power - Peak Pulse: 3000W (minimum requirement)
• Package / Case: P600 or R-6 axial packages (mechanical compatibility)

Substitutes are grouped into two categories: direct electrical equivalents with identical electrical specifications, and higher-rated alternatives that exceed the original performance envelope while maintaining voltage compatibility.

Parameter Comparison

Engineering Selection Recommendations

Direct Electrical Equivalent (Preferred for Replacement): The 3KP28CA-TP manufactured by Micro Commercial Co provides identical electrical specifications to the 3KP28CA-B, including matching voltage ratings (28V standoff, 31.1V breakdown, 45.4V clamping) and current handling (66.1A peak pulse, 3kW peak power). This part maintains active product status and ROHS3 compliance. The primary difference is the package variant (R-6 versus P600 axial), which requires mechanical verification for board layout compatibility.

Higher-Rated Alternatives: The 5KP28CA-B (Littelfuse Inc.) and 15KP28CA-TP (Micro Commercial Co) maintain identical voltage specifications while providing increased current and power handling capabilities. The 5KP28CA-B offers 112.3A peak pulse current and 5kW peak power in the same P600 package. The 15KP28CA-TP provides 15kW peak power in an R-6 package. These alternatives are suitable for applications requiring enhanced transient suppression margin or higher energy absorption capacity.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity), ensuring compatibility with standard manufacturing and storage requirements. The 5KP28CA-B and 15KP28CA-TP include REACH Unaffected status documentation.

Frequently Asked Questions (FAQ)

Q: Can the 3KP28CA-TP directly replace the 3KP28CA-B in existing designs? A: The 3KP28CA-TP provides identical electrical specifications and is functionally equivalent. However, the package variant differs (R-6 versus P600 axial), requiring verification that the component footprint and lead spacing are compatible with the existing PCB layout and mechanical assembly.

Q: What is the difference between the 3KP28CA-B and 5KP28CA-B? A: Both parts maintain identical voltage ratings (28V standoff, 31.1V breakdown, 45.4V clamping). The 5KP28CA-B provides higher current handling (112.3A versus 66.1A) and power dissipation (5kW versus 3kW). The 5KP28CA-B is suitable for applications requiring greater transient energy absorption while maintaining the same voltage protection level.

Q: Why is the 15KP28CA-TP listed as a substitute if it has a different clamping voltage? A: The 15KP28CA-TP maintains the same 28V reverse standoff and 31.1V breakdown voltages as the 3KP28CA-B. The clamping voltage difference (47.5V versus 45.4V) falls within acceptable tolerance for general-purpose transient suppression applications. The significantly higher power rating (15kW) makes this part suitable for high-energy transient environments where the original 3kW rating may be insufficient.

Q: Are all substitute parts ROHS3 compliant? A: Yes, all listed substitute parts (5KP28CA-B, 15KP28CA-TP, and 3KP28CA-TP) are ROHS3 compliant with MSL Level 1 rating, meeting current environmental and manufacturing standards.

Q: What packaging formats are available for these TVS diodes? A: The 3KP28CA-B and 5KP28CA-B use P600 axial through-hole packages. The 15KP28CA-TP and 3KP28CA-TP use R-6 axial through-hole packages. Both package types are compatible with standard through-hole PCB assembly processes, though mechanical verification is required for specific board layouts.

Q: Can I use a higher-rated part (5KP or 15KP series) in place of the 3KP28CA-B? A: Yes, the 5KP28CA-B and 15KP28CA-TP can be used as direct substitutes provided that the voltage specifications remain within the application requirements and the package footprint is compatible with the PCB design. Higher-rated parts provide additional transient suppression margin and are suitable for applications with increased energy demands.