5KP28A-B Equivalent & Substitute Parts

Part Overview

The 5KP28A-B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component operates with a 28V reverse standoff voltage and provides 5000W peak pulse power dissipation. The part is actively produced and ROHS3 compliant, making it suitable for modern electronic designs requiring transient suppression in industrial and commercial applications.

Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits alternative packaging formats while maintaining electrical performance within specified parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28	V
Voltage - Breakdown (Min)	31.1	V
Voltage - Clamping (Max) @ Ipp	45.4	V
Current - Peak Pulse (10/1000µs)	112.3	A
Power - Peak Pulse	5000	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package / Case	P600, Axial	—
Mounting Type	Through Hole	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the 5KP28A-B are identified based on the following critical electrical and mechanical 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
Diode Type: Unidirectional Zener TVS diode configuration
Mounting Compatibility: Through-hole axial package format
Temperature Range: Operating range of -55°C to 175°C (TJ)
Compliance: ROHS3 compliant status and EAR99 ECCN classification

The 5KP28A (Littelfuse Inc., Cut Tape packaging) is electrically and functionally identical to the main part, differing only in packaging format. The 3KP28A-TP (Micro Commercial Co, R-6 package) maintains voltage specifications and temperature range but operates at reduced peak pulse power (3000W versus 5000W), making it suitable only for applications with lower transient energy requirements.

Parameter Comparison

Parameter	5KP28A-B (Main)	5KP28A (Substitute)	3KP28A-TP (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	28V	28V	28V
Voltage - Breakdown (Min)	31.1V	31.1V	31.1V
Voltage - Clamping (Max) @ Ipp	45.4V	45.4V	45.4V
Current - Peak Pulse (10/1000µs)	112.3A	112.3A	Not specified
Power - Peak Pulse	5000W	5000W	3000W
Operating Temperature	-55 to 175°C (TJ)	-55 to 175°C (TJ)	-55 to 175°C (TJ)
Package / Case	P600, Axial	P600, Axial	R-6, Axial
Packaging Format	Bulk	Cut Tape (CT)	Cut Tape (CT)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

5KP28A (Littelfuse Inc.): This part is the primary substitute for the 5KP28A-B. Both components are manufactured by Littelfuse Inc., share identical electrical specifications, and maintain the same P600 axial package. The only difference is packaging format (Cut Tape versus Bulk). This substitute is suitable for direct replacement in all applications where the main part is specified.

3KP28A-TP (Micro Commercial Co): This part maintains voltage specifications and temperature range compatibility but is limited to applications with peak pulse power requirements not exceeding 3000W. The R-6 package differs from the P600 package, requiring mechanical verification for board layout compatibility. Selection of this substitute is appropriate only when power dissipation requirements are confirmed below 3000W and package dimensions are verified as compatible with the application.

Frequently Asked Questions (FAQ)

Q: Can the 5KP28A replace the 5KP28A-B in all applications?

A: Yes. The 5KP28A is electrically and functionally identical to the 5KP28A-B. Both components share the same voltage ratings, peak pulse power rating, temperature range, and P600 axial package. The difference is packaging format (Cut Tape versus Bulk), which does not affect electrical performance or board-level compatibility.

Q: What are the limitations of the 3KP28A-TP as a substitute?

A: The 3KP28A-TP maintains the same voltage specifications (28V reverse standoff, 31.1V breakdown minimum, 45.4V clamping maximum) and temperature range as the main part. However, peak pulse power is reduced to 3000W compared to 5000W for the 5KP28A-B. This substitute is suitable only for applications where transient energy does not exceed 3000W. Additionally, the R-6 package differs from the P600 package, requiring verification that board layout and mechanical constraints accommodate the alternative package geometry.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 5KP28A and 3KP28A-TP are both ROHS3 compliant, matching the compliance status of the 5KP28A-B. All three parts are classified under ECCN EAR99 and are REACH unaffected.

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

A: Both are through-hole axial packages for TVS diodes. The P600 package is the standard format for the 5KP series, while the R-6 package is used for the 3KP series. Physical dimensions and lead spacing differ between these packages. Board layout and mechanical design must be verified before substituting the 3KP28A-TP for the 5KP28A-B.

Q: How do I determine which substitute is appropriate for my application?

A: Verify two criteria: (1) Peak pulse power requirement—if your application requires 5000W dissipation capability, use the 5KP28A; if power is limited to 3000W or below, the 3KP28A-TP is acceptable. (2) Package compatibility—confirm that the selected package (P600 or R-6) fits your board layout and mechanical constraints.

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