Littelfuse 5KP28C Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The Littelfuse 5KP28C is a bidirectional transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. Rated at 28V reverse standoff voltage with 5000W peak pulse power handling, this component provides fast transient suppression in through-hole P600 axial package configuration. The 5KP28C is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Substiute Parts

5KP28C

Littelfuse Inc.In Stock: 10275KP28C Datasheet

Current PartRFQ

5KP28CA

Diotec SemiconductorIn Stock: 68405KP28CA Datasheet

DirectRFQ

SLD28-018-B

LittelfuseIn Stock: 867SLD28-018-B Datasheet

MFR RecommendedRFQ

15KP28CA-TP

Micro Commercial CoIn Stock: 109215KP28CA-TP Datasheet

MFR RecommendedRFQ

5KP28CE3/TR13

Microchip TechnologyIn Stock: 8255KP28CE3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5KP28C is determined by the following critical parameters:

• Voltage Rating: Reverse standoff voltage must be 28V (±tolerance within standard specifications)
• Breakdown Voltage: Minimum breakdown voltage in the range of 29.48V to 31.1V
• Clamping Voltage: Maximum clamping voltage at peak pulse current between 45.4V and 50V
• Power Dissipation: Peak pulse power rating of 5000W or greater
• Package Configuration: Through-hole axial package (P600 or R-6 compatible)
• Bidirectionality: Single bidirectional channel for symmetric transient suppression
• Temperature Range: Operating range of -55°C to 175°C or equivalent

The substitute parts listed below meet these electrical and mechanical criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

5KP28CA (Diotec Semiconductor): Active product with P600 axial package matching the original form factor. Clamping voltage of 45.4V is within acceptable range. Lower minimum operating temperature (-50°C vs -55°C) may require verification for applications requiring full -55°C operation. RoHS status listed as not applicable; verify compliance requirements for your application.

SLD28-018-B (Littelfuse): Manufacturer-recommended substitute from the same supplier as the original part. Maintains identical operating temperature range (-55°C to 175°C) and P600 package configuration. Includes AEC-Q101 automotive qualification and ROHS3 compliance. Clamping voltage of 45.4V and peak pulse current of 112.3A provide equivalent performance characteristics.

15KP28CA-TP (Micro Commercial Co): Active product with higher power dissipation rating (15000W vs 5000W), providing additional margin for transient suppression. Uses R-6 axial package instead of P600; verify mechanical fit in existing PCB layouts. Clamping voltage of 47.5V closely matches the original specification. ROHS3 compliant with full -55°C to 175°C operating range.

5KP28CE3/TR13 (Microchip Technology): Active product with P600 package compatibility. Clamping voltage of 50V is at the upper end of the acceptable range; verify circuit tolerance for this higher clamping point. Peak pulse current of 100A and ROHS3 compliance with full temperature range support direct substitution in most applications.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the 5KP28C?

A: All listed substitutes meet the core electrical parameters (28V standoff voltage, 5000W+ power rating, and compatible clamping voltage range). However, verify package compatibility: 5KP28CA, SLD28-018-B, and 5KP28CE3/TR13 use P600 packages; 15KP28CA-TP uses R-6 package. Confirm PCB layout and mechanical constraints before selection.

Q: What is the significance of the clamping voltage differences between substitutes?

A: Clamping voltage determines the maximum voltage spike that reaches the protected circuit. The 5KP28C specifies 47.67V maximum clamping. Substitutes range from 45.4V to 50V. Lower clamping voltages (45.4V) provide better protection margins; higher values (50V) remain within acceptable limits for most applications but should be verified against circuit design specifications.

Q: Does operating temperature range affect substitution compatibility?

A: The 5KP28C operates from -55°C to 175°C. Most substitutes match this range. The 5KP28CA operates from -50°C to 175°C, which is acceptable for applications not requiring full -55°C operation. Verify your application's minimum operating temperature requirement before selecting this alternative.

Q: Are there compliance or certification differences I should consider?

A: The SLD28-018-B includes AEC-Q101 automotive qualification, making it suitable for automotive applications. All substitutes except 5KP28CA are ROHS3 compliant. The 5KP28CA lists RoHS status as not applicable; clarify compliance requirements with your procurement or quality department if this part is selected.

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

A: Both are through-hole axial packages for TVS diodes. P600 is the standard package used in the original 5KP28C. R-6 is used by the 15KP28CA-TP and has different physical dimensions. Verify PCB footprint compatibility and lead spacing before selecting the R-6 package alternative.

Q: Can I use the 15KP28CA-TP if my circuit only requires 5000W dissipation?

A: Yes. The 15KP28CA-TP's 15000W rating exceeds the 5000W requirement, providing additional safety margin. Higher power ratings do not negatively impact performance in lower-power applications. Verify package compatibility (R-6 vs P600) for your PCB layout.