5KP54-B Equivalent & Substitute Parts

Part Overview

The 5KP54-B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 54V reverse standoff voltage, 91.46V maximum clamping voltage, and 5000W peak pulse power rating in a through-hole P600 axial package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KP54-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	54V
Voltage - Breakdown (Min)	56.84V
Voltage - Clamping (Max) @ Ipp	91.46V
Power - Peak Pulse	5000W (5kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 5KP54-B is determined by the following critical parameters:

Voltage - Reverse Standoff: 54V nominal (acceptable range 49V to 58.1V based on available substitutes)
Voltage - Clamping (Max) @ Ipp: 85V to 96.3V range
Power - Peak Pulse: Minimum 1500W (original part rated 5000W)
Unidirectional Channels: 1 (single direction protection)
Type: Zener diode
Operating Temperature: -55°C to 175°C minimum
Mounting Type: Through Hole
RoHS Compliance: ROHS3 preferred

Substitutes are grouped into three categories based on package type and power rating: P600 axial package (5000W class), DO-201 axial package (1500W class), and DO-15/DO-41 axial packages (400W to 600W class). Each category maintains the core voltage protection characteristics while offering different form factors and power dissipation capabilities.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Package / Case	Product Status	RoHS Status
5KP54-B	Littelfuse Inc.	54V	56.84V	91.46V	5000W	P600, Axial	Obsolete	ROHS3 Compliant
5KP54A	Littelfuse Inc.	54V	60V	87.1V	5000W	P600, Axial	Active	ROHS3 Compliant
5KP54A-B	Littelfuse	54V	60V	87.1V	5000W	P600, Axial	Active	ROHS3 Compliant
5KP54E3/TR13	Microchip Technology	54V	60V	96.3V	5000W	P600, Axial	Active	ROHS3 Compliant
1.5KE62A	Taiwan Semiconductor Corporation	53V	58.9V	85V	1500W	DO-201AA, Axial	Active	ROHS3 Compliant
1.5KE68A	Meritek	Not specified	64.6V	92V	1500W	DO-201, Axial	Active	Not specified
1N5612	Microchip Technology	49V	54V	78.5V	1500W	G, Axial	Active	Not specified
P4KE62A-TP	Micro Commercial Co	53V	58.9V	85V	400W	DO-41, Axial	Active	Not specified
P6KE62A	Diotec Semiconductor	53V	58.9V	85V	600W	DO-15, Axial	Active	Not applicable
P6KE68A	Fairchild Semiconductor	58.1V	64.6V	92V	600W	DO-15, Axial	Active	Not specified

Engineering Selection Recommendations

Primary Substitutes (Same Package, Same Power Rating):

5KP54A and 5KP54A-B are direct replacements for the 5KP54-B. Both are manufactured by Littelfuse, maintain the P600 axial package, deliver 5000W peak pulse power, and are ROHS3 compliant with active product status. The 5KP54A-B in bulk packaging directly mirrors the original part's specifications with improved clamping voltage performance (87.1V vs 91.46V).

5KP54E3/TR13 from Microchip Technology is an alternative in the same P600 package with 5000W rating and ROHS3 compliance. This part offers slightly higher clamping voltage (96.3V) and maintains active product status.

Secondary Substitutes (Different Package, Reduced Power Rating):

1.5KE62A from Taiwan Semiconductor Corporation and 1.5KE68A from Meritek provide 1500W peak pulse power in DO-201 axial packages. Both maintain voltage protection characteristics within acceptable ranges and are ROHS3 compliant or active status. These are suitable for applications where 1500W dissipation capacity is sufficient.

1N5612 from Microchip Technology offers 1500W in an alternative axial package with active product status. The lower reverse standoff voltage (49V) requires circuit-level evaluation for compatibility.

Tertiary Substitutes (Compact Packages, Lower Power Rating):

P6KE62A and P6KE68A in DO-15 packages provide 600W peak pulse power for space-constrained applications. P4KE62A-TP in DO-41 package offers 400W rating. These are suitable only where thermal and power dissipation requirements are significantly reduced from the original 5000W specification.

Frequently Asked Questions (FAQ)

Q: Can I use a 1500W rated substitute in place of the 5KP54-B's 5000W rating?

A: Substitution depends on your circuit's actual peak pulse current and energy requirements. The 5KP54-B is rated for 5000W peak pulse power. A 1500W substitute like the 1.5KE62A will function for voltage clamping but has reduced thermal capacity. Verify that your application's peak pulse energy does not exceed the substitute's 1500W specification.

Q: What is the difference between 5KP54A and 5KP54A-B?

A: Both parts are electrically identical with 54V reverse standoff, 87.1V clamping voltage, and 5000W power rating in P600 packages. The primary difference is packaging: 5KP54A is supplied in Cut Tape (CT), while 5KP54A-B is supplied in Bulk. Select based on your procurement and assembly requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Not all substitutes explicitly state ROHS3 compliance. 5KP54A, 5KP54A-B, 5KP54E3/TR13, and 1.5KE62A are confirmed ROHS3 compliant. Verify compliance status with your supplier for parts marked as "Not applicable" or "Not specified" if ROHS3 certification is required for your application.

Q: Can I use P6KE62A or P4KE62A-TP in high-energy transient applications?

A: These parts are rated for 600W and 400W peak pulse power respectively, significantly lower than the original 5KP54-B's 5000W. They are suitable only for low-energy transient protection. For high-energy applications, use P600 package substitutes (5KP54A, 5KP54A-B, or 5KP54E3/TR13) or 1500W-rated DO-201 packages.

Q: What is the voltage tolerance range for substitution?

A: The 5KP54-B operates at 54V reverse standoff. Acceptable substitutes range from 49V (1N5612) to 58.1V (P6KE68A) reverse standoff voltage. Verify that your circuit's operating voltage and transient protection requirements fall within the substitute's voltage window. Clamping voltage should remain below your circuit's maximum tolerable voltage.

Q: Are through-hole packages interchangeable between P600, DO-201, DO-15, and DO-41?

A: No. These are distinct through-hole package formats with different lead spacing and physical dimensions. P600 and DO-201 are larger axial packages suitable for high-power applications. DO-15 and DO-41 are compact axial packages for space-constrained designs. Select the package based on your PCB layout and thermal requirements, not interchangeably.

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