5KP28 Equivalent & Substitute Parts

Part Overview

The 5KP28 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This through-hole P600 axial package component operates across a temperature range of -55°C to 175°C and provides 5000W peak pulse power dissipation. The 5KP28 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

5KP28

Littelfuse Inc.In Stock: 10155KP28 Datasheet

Current PartRFQ

5KP28A

Littelfuse Inc.In Stock: 149105KP28A Datasheet

DirectRFQ

SLD28U-017-B

Littelfuse Inc.In Stock: 674SLD28U-017-B Datasheet

MFR RecommendedRFQ

3KP28A-TP

Micro Commercial CoIn Stock: 19123KP28A-TP Datasheet

MFR RecommendedRFQ

5KP28A-TP

Micro Commercial CoIn Stock: 8035KP28A-TP Datasheet

MFR RecommendedRFQ

5KP28E3/TR13

Microchip TechnologyIn Stock: 8675KP28E3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5KP28 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must be 28V
• Voltage - Clamping (Max) @ Ipp: Must not exceed 47.67V (lower values acceptable for reduced transient stress)
• Power - Peak Pulse: Must be 5000W minimum
• Operating Temperature Range: Must support -55°C ~ 175°C
• Mounting Type: Through Hole required
• Type: Zener diode, unidirectional configuration
• RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories based on package compatibility:

Category A - P600 Axial Package (Direct Mechanical Compatibility):

• 5KP28A (Littelfuse Inc.)
• SLD28U-017-B (Littelfuse Inc., Automotive Grade)
• 5KP28E3/TR13 (Microchip Technology)

Category B - R-6 Axial Package (Alternative Mechanical Form):

• 3KP28A-TP (Micro Commercial Co)
• 5KP28A-TP (Micro Commercial Co)

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (P600 Package - Direct Mechanical Fit):

5KP28A (Littelfuse Inc.) is the direct active equivalent. It maintains the P600 axial package, identical voltage standoff specification, and equivalent 5000W power rating. The lower clamping voltage (45.4V vs 47.67V) provides improved transient suppression performance. Active product status ensures long-term availability and supply chain continuity.

SLD28U-017-B (Littelfuse Inc.) offers automotive-grade qualification (AEC-Q101) with identical electrical parameters to 5KP28A. Selection of this part is appropriate for applications requiring automotive-level reliability and traceability.

5KP28E3/TR13 (Microchip Technology) maintains P600 package compatibility and 5000W power rating. The clamping voltage specification of 50V is within acceptable tolerance for the 5KP28 application envelope. Tape & Reel packaging supports automated assembly processes.

Secondary Substitutes (R-6 Package - Alternative Mechanical Form):

5KP28A-TP (Micro Commercial Co) provides equivalent electrical performance with 5000W power rating and R-6 axial package. This substitute requires PCB layout modification to accommodate the different package footprint.

3KP28A-TP (Micro Commercial Co) operates at reduced power dissipation (3000W vs 5000W). This part is suitable only for applications where peak pulse power requirements do not exceed 3000W.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can 5KP28A directly replace 5KP28 without PCB modification?

A: Yes. The 5KP28A maintains identical P600 axial package geometry and through-hole mounting specifications. No PCB layout changes are required for direct substitution.

Q: What is the significance of the clamping voltage difference between 5KP28 (47.67V) and its substitutes (45.4V)?

A: The lower clamping voltage in active substitutes (5KP28A, SLD28U-017-B, 3KP28A-TP, 5KP28A-TP) indicates more aggressive transient suppression. This provides enhanced protection against voltage spikes and is functionally superior for the same 28V standoff specification. The 5KP28E3/TR13 at 50V clamping voltage remains within acceptable operating margins.

Q: Is 3KP28A-TP suitable as a substitute for all 5KP28 applications?

A: No. The 3KP28A-TP is rated for 3000W peak pulse power, compared to 5KP28's 5000W specification. This part is suitable only for applications where peak pulse power requirements do not exceed 3000W. Verify application power dissipation requirements before selection.

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

A: Both are axial through-hole packages for TVS diodes. P600 and R-6 differ in physical dimensions and lead spacing. Substitutes using R-6 packages (3KP28A-TP, 5KP28A-TP) require PCB footprint modification compared to the original P600 package.

Q: Does SLD28U-017-B offer advantages over standard 5KP28A?

A: SLD28U-017-B carries AEC-Q101 automotive qualification, indicating compliance with automotive reliability and testing standards. Selection is appropriate for automotive applications or designs requiring automotive-grade component traceability. Electrical performance is equivalent to 5KP28A.

Q: Are all substitutes available in the same packaging formats as 5KP28?

A: No. The original 5KP28 packaging format is not specified in available data. Substitutes are available in Cut Tape (CT), Bulk, and Tape & Reel (TR) formats. Verify packaging compatibility with procurement and assembly requirements.

Q: Can 5KP28E3/TR13 be used in applications sensitive to clamping voltage tolerance?

A: The 5KP28E3/TR13 specifies 50V maximum clamping voltage, which is 2.33V higher than the original 5KP28 (47.67V). For applications with strict transient voltage limits, verify that the higher clamping voltage remains within system tolerance specifications before selection.