5KP51C Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 5KP51C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 51V reverse standoff voltage, 5000W peak pulse power rating, and through-hole P600 axial packaging. The 5KP51C is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KP51C
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	51V
Voltage - Clamping (Max) @ Ipp	86.52V
Power - Peak Pulse	5000W (5kW)
Mounting Type	Through Hole
Package / Case	P600, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 5KP51C is determined by the following critical parameters: reverse standoff voltage (51V nominal), bidirectional operation (1 channel), peak pulse power rating (5000W), through-hole mounting, and axial package configuration. Substitute parts are grouped into two categories based on package compatibility:

Category 1: P600 Axial Package (Direct Package Match) Parts maintaining the P600 axial package form factor with 5000W power rating and 51V standoff voltage specification.

Category 2: Alternative Axial Packages (Functional Equivalents) Parts with different axial package types (DO-201, DO-15, R-6, DO-41) that maintain the 51V to 53V standoff voltage range and provide equivalent or reduced power dissipation capacity. These require mechanical re-evaluation for board layout compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Package / Case	Product Status	Operating Temperature
5KP51C	Littelfuse Inc.	51V	86.52V	5000W	P600, Axial	Obsolete	-55°C ~ 175°C
5KP51CA	Littelfuse Inc.	51V	82.4V	5000W	P600, Axial	Active	-55°C ~ 175°C
5KP51CE3/TR13	Microchip Technology	51V	91.1V	5000W	P600, Axial	Active	-55°C ~ 175°C
5KP51CA-TP	Micro Commercial Co	51V	82.4V	5000W	R-6, Axial	Active	-55°C ~ 175°C
1.5KE62CA	Taiwan Semiconductor Corporation	53V	85V	1500W	DO-201AA, DO-27, Axial	Active	-55°C ~ 175°C
1.5KE68CA	Taiwan Semiconductor Corporation	58.1V	92V	1500W	DO-201AA, DO-27, Axial	Active	-55°C ~ 175°C
P6KE62CA	Diotec Semiconductor	53V	85V	600W	DO-204AC, DO-15, Axial	Active	-50°C ~ 175°C
P6KE68CA	Fairchild Semiconductor	58.1V	92V	600W	DO-204AC, DO-15, Axial	Active	-50°C ~ 175°C
P4KE62CA-TP	Micro Commercial Co	53V	85V	400W	DO-204AL, DO-41, Axial	Active	-55°C ~ 175°C

Engineering Selection Recommendations

Primary Recommendation: 5KP51CA This Littelfuse part maintains identical electrical specifications (51V standoff, 5000W power rating) and P600 axial package configuration as the 5KP51C. Product status is active with full ROHS3 compliance and unlimited moisture sensitivity rating. This represents the direct functional replacement with no design modifications required.

Secondary Recommendation: 5KP51CE3/TR13 Microchip Technology part with identical package (P600 axial) and power rating (5000W) at 51V standoff voltage. Clamping voltage is 91.1V compared to 86.52V on the original part. Active product status with ROHS3 and REACH compliance. Suitable for direct substitution with no layout changes.

Alternative Recommendation: 5KP51CA-TP Micro Commercial Co part maintains 51V standoff and 5000W power rating but uses R-6 axial package instead of P600. Board layout modification required due to different package footprint. Active status with ROHS3 compliance.

Lower Power Alternatives: 1.5KE62CA, 1.5KE68CA, P6KE62CA, P6KE68CA, P4KE62CA-TP These parts provide reduced peak pulse power ratings (1500W, 600W, or 400W) with standoff voltages in the 53V to 58.1V range. Selection of these alternatives requires application-level power dissipation analysis to confirm adequacy for the intended circuit protection function. All are active products with appropriate compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can 5KP51CA directly replace 5KP51C without PCB modifications? A: Yes. The 5KP51CA maintains identical P600 axial package configuration, 51V reverse standoff voltage, and 5000W peak pulse power rating. No board layout changes are required.

Q: What is the difference between 5KP51CA and 5KP51CE3/TR13? A: Both parts share the same P600 package, 51V standoff voltage, and 5000W power rating. The primary difference is clamping voltage: 5KP51CA clamps at 82.4V while 5KP51CE3/TR13 clamps at 91.1V. Selection depends on circuit clamping voltage requirements.

Q: Why do lower power alternatives (1.5KE series, P6KE series) have different standoff voltages? A: These parts are from different product families with different voltage ratings. The 1.5KE62CA and P6KE62CA are rated at 53V standoff (compared to 51V), and 1.5KE68CA and P6KE68CA are rated at 58.1V standoff. Voltage tolerance and application requirements determine suitability.

Q: Can I use P6KE62CA or P6KE68CA as substitutes? A: These parts have reduced power ratings (600W versus 5000W) and different package types (DO-15 instead of P600). They are suitable only if circuit peak pulse power requirements do not exceed 600W and board layout accommodates DO-15 axial package.

Q: What is the impact of using 1.5KE62CA or 1.5KE68CA? A: These parts provide 1500W peak pulse power (versus 5000W) in DO-201 axial package. They are suitable for applications with lower transient energy levels. Board layout must accommodate the different package footprint.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts are ROHS3 compliant. Verify specific compliance documentation for your supply chain requirements.

Q: What package types are available among the substitutes? A: Substitutes are available in P600, R-6, DO-201, DO-15, and DO-41 axial packages. P600 and R-6 packages maintain closest mechanical compatibility with the original 5KP51C. Alternative packages require PCB footprint evaluation.

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