5KP51A Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 5KP51A is a unidirectional Zener transient voltage suppressor manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This through-hole P600 package device operates across a temperature range of -55°C to 175°C and maintains ROHS3 compliance. The 5KP51A is currently in active production status with 4200 units in stock. Substitute parts are identified when equivalent electrical performance can be achieved within the specified voltage and power parameters while maintaining through-hole mounting compatibility and general-purpose application suitability.

Key Parameters

Parameter	5KP51A Value	Unit
Voltage - Reverse Standoff (Typ)	51	V
Voltage - Breakdown (Min)	56.7	V
Voltage - Clamping (Max) @ Ipp	82.4	V
Current - Peak Pulse (10/1000µs)	61.9	A
Power - Peak Pulse	5000	W
Operating Temperature	-55 to 175	°C
Mounting Type	Through Hole	-
Package / Case	P600, Axial	-
Type	Zener	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitute parts for the 5KP51A are grouped based on the following substitution criteria:

Primary Substitution Parameters:

Voltage - Reverse Standoff (Typ): 51V to 60V range
Voltage - Clamping (Max) @ Ipp: 82.4V to 96.8V range
Power - Peak Pulse: 400W to 5000W
Type: Zener, unidirectional
Mounting Type: Through Hole
Operating Temperature: -55°C to 175°C minimum
Applications: General Purpose
RoHS Compliance: ROHS3 Compliant

Substitutes are organized into three categories based on power dissipation capability and package form factor: high-power 5000W devices (5KP series), mid-power 1500W devices (1.5KE series), and lower-power 400W to 600W devices (P4KE and P6KE series). Each category maintains electrical compatibility within specified voltage parameters while accommodating different package and current requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ) [V]	Voltage - Clamping (Max) @ Ipp [V]	Current - Peak Pulse [A]	Power - Peak Pulse [W]	Package / Case	Operating Temperature [°C]	RoHS Status
5KP51A	Littelfuse	51	82.4	61.9	5000	P600, Axial	-55 to 175	ROHS3 Compliant
5KP54A	Littelfuse Inc.	54	87.1	58.6	5000	P600, Axial	-55 to 175	ROHS3 Compliant
5KP58A	Littelfuse	58	93.6	54.5	5000	P600, Axial	-55 to 175	ROHS3 Compliant
5KP60A	Diotec Semiconductor	60	96.8	52	5000	P600, Axial	-50 to 175	ROHS3 Compliant
1.5KE62A	Taiwan Semiconductor Corporation	53	85	18	1500	DO-201AA, DO-27, Axial	-55 to 175	ROHS3 Compliant
1.5KE68A	Meritek	-	92	16.5	1500	Axial	-55 to 175	-
P4KE62A	Taiwan Semiconductor Corporation	53	85	5	400	DO-204AL, DO-41, Axial	-55 to 175	ROHS3 Compliant
P4KE68A	Taiwan Semiconductor Corporation	58.1	92	4.5	400	DO-204AL, DO-41, Axial	-55 to 175	ROHS3 Compliant
P6KE62A	Diotec Semiconductor	53	85	7.4	600	DO-204AC, DO-15, Axial	-50 to 175	Not applicable
P6KE68A	Fairchild Semiconductor	58.1	92	6.8	600	DO-204AC, DO-15, Axial	-50 to 175	-
SA58A	Taiwan Semiconductor Corporation	58	93.6	5.6	500	DO-204AC, DO-15, Axial	-55 to 175	ROHS3 Compliant

Engineering Selection Recommendations

5KP Series (5000W Power Rating): The 5KP54A, 5KP58A, and 5KP60A maintain identical P600 package form factor and 5000W power dissipation as the 5KP51A. All three are ROHS3 compliant and active production status. The 5KP54A and 5KP58A are manufactured by Littelfuse, matching the original manufacturer. Selection within this group depends on required reverse standoff voltage: 54V for 5KP54A, 58V for 5KP58A, or 60V for 5KP60A. The 5KP60A from Diotec Semiconductor operates at a minimum temperature of -50°C versus -55°C for Littelfuse variants.

1.5KE Series (1500W Power Rating): The 1.5KE62A and 1.5KE68A provide reduced power dissipation at 1500W with lower peak pulse currents. Both maintain through-hole axial mounting and -55°C to 175°C operating temperature. The 1.5KE62A from Taiwan Semiconductor Corporation is ROHS3 compliant with 300,200 units in stock. The 1.5KE68A from Meritek offers 92V clamping voltage equivalent to higher standoff voltage applications.

P4KE Series (400W Power Rating): The P4KE62A and P4KE68A are compact DO-204AL (DO-41) package devices rated at 400W. Both are manufactured by Taiwan Semiconductor Corporation and ROHS3 compliant. These are suitable for applications with lower current requirements (5A and 4.5A respectively) and space constraints.

P6KE and SA Series (500W to 600W Power Rating): The P6KE62A, P6KE68A, and SA58A offer intermediate power dissipation in DO-15 (DO-204AC) package. The SA58A from Taiwan Semiconductor Corporation is ROHS3 compliant with 500W rating and matches the 58V standoff voltage of 5KP58A with lower current handling.

All recommended substitutes maintain unidirectional Zener type, general-purpose application classification, and through-hole mounting. Selection should prioritize ROHS3 compliance and active production status for new designs.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 1.5KE62A for the 5KP51A in my application?

A: The 1.5KE62A is electrically compatible within voltage parameters (53V standoff, 85V clamping) but is rated at 1500W versus 5000W for the 5KP51A. Substitution is valid only if your application peak pulse current does not exceed 18A. The 1.5KE62A uses DO-201AA package instead of P600, requiring PCB layout modification.

Q: What is the difference between P4KE and P6KE series substitutes?

A: The P4KE series is rated at 400W with peak pulse currents of 4.5A to 5A in DO-204AL (DO-41) package. The P6KE series is rated at 600W with peak pulse currents of 6.8A to 7.4A in DO-15 (DO-204AC) package. Both are lower power alternatives to the 5KP51A and require application current verification before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: The 5KP54A, 5KP58A, 1.5KE62A, P4KE62A, P4KE68A, and SA58A are ROHS3 compliant. The 5KP60A is ROHS3 compliant. The P6KE62A and P6KE68A have undefined or not applicable RoHS status. Verify compliance requirements for your specific application before selection.

Q: Can I use a P6KE68A instead of 5KP51A if voltage parameters match?

A: The P6KE68A matches voltage parameters (58.1V standoff, 92V clamping) but is rated at 600W versus 5000W. This substitution is valid only for applications with peak pulse currents below 6.8A. The DO-15 package differs from P600, requiring PCB redesign.

Q: What is the minimum operating temperature for all substitutes?

A: Most substitutes operate from -55°C to 175°C. The 5KP60A and P6KE series operate from -50°C to 175°C. Verify minimum temperature requirements for your application before selecting 5KP60A or P6KE variants.

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

A: Identify your required reverse standoff voltage (51V to 60V range), peak pulse current, and power dissipation. Match these to the substitute part specifications. Verify package compatibility with your PCB layout. Confirm RoHS and temperature compliance with your design requirements.

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