Equivalent & Substitute Parts for 5KP26A-E3/51

Part Overview

The 5KP26A-E3/51 is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This component is rated for 26V reverse standoff voltage with a 42.1V maximum clamping voltage and 119A peak pulse current in a P600 axial through-hole package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	26V
Voltage - Breakdown (Min)	28.9V
Voltage - Clamping (Max) @ Ipp	42.1V
Current - Peak Pulse (10/1000µs)	119A
Power - Peak Pulse	5000W (5kW)
Type	Zener
Unidirectional Channels	1
Mounting Type	Through Hole
Package / Case	P600, Axial
Operating Temperature	-55°C ~ 175°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 5KP26A-E3/51 is determined by the following critical parameters:

Voltage - Reverse Standoff: 26V (primary selection criterion)
Voltage - Clamping (Max) @ Ipp: 42.1V (maximum allowable clamping voltage)
Current - Peak Pulse: 119A minimum (transient protection capability)
Power - Peak Pulse: 5000W minimum (energy dissipation capacity)
Package / Case: P600, Axial (physical and electrical compatibility)
Mounting Type: Through Hole (circuit board integration requirement)
Operating Temperature: -55°C ~ 175°C (thermal operating range)

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (5kW Power Rating) Parts maintaining the exact 5000W power rating with 26V standoff voltage and compatible clamping characteristics. These provide one-to-one functional replacement.

Category 2: Higher Power Alternatives (15kW and 20kW Power Ratings) Parts with identical voltage specifications but increased peak pulse current and power dissipation. These offer enhanced transient protection capability while maintaining voltage compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package	Product Status
5KP26A-E3/51	Vishay	26V	42.1V	119A	5000W	P600, Axial	Obsolete
5KP26A-E3/54	Vishay	26V	42.1V	119A	5000W	P600, Axial	Active
5KP26AHE3/54	Vishay	26V	42.1V	119A	5000W	P600, Axial	Active
5KP26AE3/TR13	Microchip Technology	26V	42.1V	119A	5000W	P600, Axial	Active
5KP26A	Littelfuse Inc.	26V	42.1V	121.1A	5000W	P600, Axial	Active
5KP26A-B	Littelfuse Inc.	26V	42.1V	121.1A	5000W	P600, Axial	Active
15KPA26A	MDE Semiconductor Inc	26V	44V	343.2A	15000W	P600, Axial	Active
15KPA26A-B	Littelfuse Inc.	26V	44V	343.2A	15000W	P600, Axial	Active
15KPA26A-HR	Littelfuse Inc.	26V	44V	343.2A	15000W	P600, Axial	Active
15KPA26A-HRA	Littelfuse Inc.	26V	44V	343.2A	15000W	P600, Axial	Active
20KPA26A	MDE Semiconductor Inc	26V	44.7V	451.9A	20000W	P600, Axial	Active

Engineering Selection Recommendations

Direct Replacement (5kW Category): For applications requiring exact electrical equivalence to the 5KP26A-E3/51, select from active parts with identical 5000W power rating: 5KP26A-E3/54, 5KP26AHE3/54, 5KP26AE3/TR13, 5KP26A, or 5KP26A-B. All maintain 26V standoff voltage, 42.1V clamping voltage, and P600 axial package compatibility. The 5KP26A-E3/54 from Vishay provides the closest product lineage continuity. Littelfuse 5KP26A and 5KP26A-B offer marginally higher peak pulse current (121.1A) within the same power class.

Higher Power Alternatives (15kW and 20kW Categories): Applications requiring enhanced transient suppression capability may use 15KPA26A series (343.2A peak pulse, 15000W) or 20KPA26A (451.9A peak pulse, 20000W). These maintain the 26V standoff voltage specification while providing increased energy dissipation. The 15KPA26A-HRA from Littelfuse offers tape & reel packaging for automated assembly. The 20KPA26A from MDE Semiconductor provides the highest power rating at 20000W.

Compliance Considerations: All substitute parts are ROHS3 compliant and rated for -55°C to 175°C operating temperature, matching the original specification. Littelfuse 15KPA-HR and 15KPA-HRA series are qualified to AEC-Q101 automotive standards where applicable.

Frequently Asked Questions (FAQ)

Q: Can I use a 15KPA26A or 20KPA26A as a direct replacement for the 5KP26A-E3/51? A: Yes, electrically. Both maintain the 26V reverse standoff voltage and P600 axial package. However, the higher power ratings (15kW and 20kW versus 5kW) result in different clamping voltages (44V and 44.7V respectively). Verify your circuit design tolerates the slightly higher clamping voltage before substitution.

Q: What is the difference between 5KP26A-E3/54 and 5KP26AHE3/54? A: Both are Vishay parts with identical electrical specifications (26V standoff, 42.1V clamping, 119A peak pulse, 5000W power). The 5KP26AHE3/54 carries AEC-Q101 automotive qualification. Select based on application requirements.

Q: Are Littelfuse and Microchip versions compatible with the original Vishay part? A: Yes. All substitute parts maintain the critical parameters: 26V standoff voltage, P600 axial through-hole package, and -55°C to 175°C operating temperature. Electrical performance is equivalent within specified tolerances.

Q: What packaging options are available? A: Substitute parts are available in Cut Tape (CT), Bulk, and Tape & Reel (TR) packaging. Select based on your procurement and assembly requirements. Tape & Reel packaging is standard for automated pick-and-place assembly.

Q: Why do some parts show higher peak pulse current (121.1A vs 119A) at the same 5kW power rating? A: Minor variations in peak pulse current specification occur within the same power class due to manufacturing tolerances and test conditions. Both values satisfy the 5000W power requirement and are functionally equivalent for circuit protection.

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