5KP75A-E3/51 Equivalent & Substitute Parts

Part Overview

The 5KP75A-E3/51 is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This through-hole P600 axial package device is rated for 75V reverse standoff voltage with a 121V maximum clamping voltage and 41.3A peak pulse current at 5000W peak pulse power. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KP75A-E3/51
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	75V
Voltage - Breakdown (Min)	83.3V
Voltage - Clamping (Max) @ Ipp	121V
Current - Peak Pulse (10/1000µs)	41.3A
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 5KP75A-E3/51 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 75V
Voltage - Clamping (Max) @ Ipp: 121V ±1V tolerance
Current - Peak Pulse (10/1000µs): 41.3A minimum
Power - Peak Pulse: 5000W minimum
Package / Case: P600, Axial through-hole
Operating Temperature Range: -55°C ~ 175°C
Type: Zener, Unidirectional
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (5kW Power Class): Parts with identical voltage ratings (75V standoff, 121V clamping) and 41.3A peak pulse current at 5000W power dissipation. These provide direct functional replacement with minimal circuit redesign.

Category B - Higher Power Alternatives (15kW and 30kW Power Classes): Parts with identical voltage ratings but higher peak pulse current and power dissipation capabilities. These provide enhanced transient protection margin and are suitable for applications requiring greater surge handling capacity.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package	Product Status	RoHS Status
5KP75A-E3/51	Vishay	75V	121V	41.3A	5000W	P600, Axial	Obsolete	ROHS3
5KP75AHE3/54	Vishay	75V	121V	41.3A	5000W	P600, Axial	Active	ROHS3
5KP75A-E3/54	Vishay	75V	121V	41.3A	5000W	P600, Axial	Active	ROHS3
5KP75AE3/TR13	Microchip Technology	75V	121V	41.3A	5000W	P600, Axial	Active	ROHS3
15KPA75A	MDE Semiconductor Inc	75V	122V	123.8A	15000W	P600, Axial	Active	ROHS3
15KPA75A-B	Littelfuse Inc.	75V	122V	123.8A	15000W	P600, Axial	Active	ROHS3
15KPA75A-HR	Littelfuse Inc.	75V	122V	123.8A	15000W	P600, Axial	Active	ROHS3
15KPA75A-HRA	Littelfuse Inc.	75V	122V	123.8A	15000W	P600, Axial	Active	ROHS3
30KPA75A-HR	Littelfuse Inc.	75V	119.4V	253.8A	30000W	P600, Axial	Active	ROHS3
30KPA75A-HRA	Littelfuse Inc.	75V	119.4V	253.8A	30000W	P600, Axial	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

The 5KP75A-E3/54 from Vishay is the manufacturer-recommended direct replacement. It maintains identical electrical specifications (75V standoff, 121V clamping, 41.3A peak pulse, 5000W power) and is available in active production status with ROHS3 compliance. The 5KP75AHE3/54 variant offers automotive-grade qualification (AEC-Q101) for applications requiring automotive reliability standards.

The 5KP75AE3/TR13 from Microchip Technology provides an equivalent alternative with identical electrical parameters and active product status, suitable for applications where multi-source qualification is required.

Higher Power Alternatives:

The 15KPA series (15KPA75A, 15KPA75A-B, 15KPA75A-HR, 15KPA75A-HRA) from MDE Semiconductor and Littelfuse provides 15kW peak pulse power with 123.8A peak pulse current. These are suitable for applications requiring enhanced transient protection margin while maintaining the 75V voltage class.

The 30KPA series (30KPA75A-HR, 30KPA75A-HRA) from Littelfuse provides 30kW peak pulse power with 253.8A peak pulse current. These are appropriate for high-energy transient environments where maximum protection is required.

All substitute parts maintain ROHS3 compliance and P600 axial through-hole packaging, ensuring mechanical and environmental compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can I use a 15KPA75A or 30KPA75A in place of the 5KP75A-E3/51?

A: Yes. The 15KPA and 30KPA series maintain the same 75V reverse standoff voltage and compatible clamping voltage characteristics. The higher peak pulse current and power ratings provide additional transient suppression capability without affecting circuit operation. No circuit modifications are required.

Q: What is the difference between 5KP75A-E3/54 and 5KP75AHE3/54?

A: Both parts are electrically identical with 75V standoff, 121V clamping, and 41.3A peak pulse current. The 5KP75AHE3/54 includes automotive-grade qualification (AEC-Q101) and is designated for automotive applications. Select based on application requirements.

Q: Are packaging options interchangeable?

A: All substitute parts listed use the P600 axial through-hole package. Packaging variants (Cut Tape, Tape & Reel, Bulk) refer to supply format only and do not affect electrical or mechanical compatibility. The physical component remains identical.

Q: Why is the 5KP75A-E3/51 obsolete?

A: The original part is obsolete, but functionally equivalent active alternatives are available from multiple manufacturers. The 5KP75A-E3/54 is the direct manufacturer replacement from Vishay.

Q: What is the difference between Littelfuse 15KPA75A-HR and 15KPA75A-HRA?

A: Both parts are electrically identical with 75V standoff, 122V clamping, and 123.8A peak pulse current at 15kW power. The suffix designations indicate different manufacturing series within Littelfuse's product line. Selection depends on availability and supply chain requirements.

Q: Can I substitute a lower power part for a higher power part?

A: No. Substituting a lower power part (5kW) for a higher power application requirement is not appropriate. However, substituting a higher power part (15kW or 30kW) for a 5kW application is acceptable and provides additional protection margin.

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