5KP28A-E3/51 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 5KP28A-E3/51 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This through-hole axial component is designed for general-purpose transient voltage suppression applications with a 28V reverse standoff voltage and 45.4V maximum clamping voltage at peak pulse current.

The 5KP28A-E3/51 is classified as obsolete. Equivalent and substitute parts are available from multiple manufacturers with identical or enhanced electrical characteristics, ensuring continued design support and procurement flexibility.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	28V
Voltage - Breakdown (Min)	31.1V
Voltage - Clamping (Max) @ Ipp	45.4V
Current - Peak Pulse (10/1000µs)	110A
Power - Peak Pulse	5000W (5kW)
Operating Temperature Range	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 5KP28A-E3/51 is determined by the following critical parameters:

Voltage - Reverse Standoff: 28V (exact match required)
Voltage - Breakdown (Min): 31.1V minimum
Voltage - Clamping (Max) @ Ipp: 45.4V maximum
Current - Peak Pulse: 110A minimum
Power - Peak Pulse: 5000W minimum
Operating Temperature: -55°C ~ 175°C
Mounting Type: Through Hole
Package / Case: P600 or R-6 Axial

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (5kW Power Rating) Parts with identical 5000W peak pulse power and 110A peak pulse current specifications. These provide one-to-one functional replacement with no derating required.

Category 2: Enhanced Performance Substitutes (15kW or 20kW Power Rating) Parts with higher peak pulse power ratings (15000W or 20000W) and correspondingly higher peak pulse currents (317.9A or 420.8A). These provide superior transient suppression capability while maintaining the same 28V reverse standoff voltage and compatible clamping voltage characteristics. These parts are suitable for applications requiring enhanced protection margins.

Parameter Comparison

Part Number	Manufacturer	Voltage RWM (V)	Voltage Breakdown Min (V)	Voltage Clamp Max (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Product Status
5KP28A-E3/51	Vishay	28	31.1	45.4	110	5000	P600	Obsolete
5KP28AHE3/54	Vishay	28	31.1	45.4	110	5000	P600	Active
5KP28A-E3/54	Vishay	28	31.1	45.4	110	5000	P600	Active
5KP28AE3/TR13	Microchip Technology	28	31.1	45.4	110	5000	P600	Active
15KP28A-TP	Micro Commercial Co	28	31.1	47.5	—	15000	R-6	Active
15KPA28A	MDE Semiconductor Inc	28	31.28	47.5	317.9	15000	P600	Active
15KPA28A-B	Littelfuse Inc.	28	31.28	47.5	317.9	15000	P600	Active
15KPA28A-HR	Littelfuse Inc.	28	31.28	47.5	317.9	15000	P600	Active
15KPA28A-HRA	Littelfuse	28	31.28	47.5	317.9	15000	P600	Active
20KPA28A	MDE Semiconductor Inc	28	31.28	48	420.8	20000	P600	Active
20KPA28A-B	Littelfuse Inc.	28	31.28	48	420.8	20000	P600	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

Select 5KP28A-E3/54 (Vishay, Active status) as the primary replacement. This part maintains identical electrical specifications and P600 axial package compatibility with the obsolete 5KP28A-E3/51. Availability is confirmed at 8400 units in stock. Both parts are ROHS3 compliant with unlimited moisture sensitivity rating.

Alternative direct equivalents include 5KP28AHE3/54 (Vishay, Automotive grade with AEC-Q101 qualification) for applications requiring automotive-level reliability, and 5KP28AE3/TR13 (Microchip Technology) for alternative sourcing.

For Enhanced Protection Applications:

The 15KPA28A series (15000W rating) and 20KPA28A series (20000W rating) provide higher transient suppression capability while maintaining the 28V reverse standoff voltage. These parts are suitable for applications where additional protection margin is beneficial. The 15KPA28A-HRA and 15KPA28A-HR variants from Littelfuse offer tape and reel packaging for automated assembly. The 20KPA28A-B from Littelfuse is available in bulk packaging.

All substitute parts listed are ROHS3 compliant and operate within the -55°C to 175°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can I use a 15KPA28A or 20KPA28A as a direct replacement for the 5KP28A-E3/51?

A: Yes. These parts maintain the same 28V reverse standoff voltage and are electrically compatible. The higher power ratings (15kW and 20kW versus 5kW) provide enhanced transient suppression capability without compromising circuit performance. The clamping voltage is slightly higher (47.5V or 48V versus 45.4V), which remains within acceptable design margins for 28V systems.

Q: What is the difference between P600 and R-6 packages?

A: Both are through-hole axial packages for the same component category. P600 is the standard package used in the 5KP28A-E3/51. The R-6 package (used in 15KP28A-TP) is an alternative axial format. Physical dimensions and lead spacing may differ; verify PCB footprint compatibility before substitution.

Q: Are there packaging format differences I should consider?

A: Yes. The 5KP28A-E3/54 is available in Cut Tape (CT) packaging. The 5KP28AHE3/54 and 5KP28AE3/TR13 are available in Tape & Reel (TR) format. The 15KPA28A and 20KPA28A series offer both Bulk and Tape & Reel options. Select packaging based on assembly requirements and order quantities.

Q: Does the Automotive grade variant (5KP28AHE3/54) affect circuit performance?

A: No. The AEC-Q101 qualification indicates enhanced reliability screening and documentation for automotive applications. Electrical specifications remain identical to the standard 5KP28A-E3/54. Use the automotive variant only if your application requires automotive-level traceability and qualification.

Q: What compliance certifications apply to all substitute parts?

A: All listed substitute parts are ROHS3 compliant. Moisture Sensitivity Level is 1 (Unlimited) for most variants, indicating no special moisture handling requirements. REACH status is either Unaffected or available upon request. ECCN classification is EAR99 for all parts.

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