5KP28C-B Equivalent & Substitute Parts

Part Overview

The 5KP28C-B is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This component features a 28V reverse standoff voltage, 47.67V maximum clamping voltage, and 5000W peak pulse power rating in a P600 axial through-hole package. The part is currently obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for circuit protection applications.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	28V
Voltage - Breakdown (Min)	29.48V
Voltage - Clamping (Max) @ Ipp	47.67V
Power - Peak Pulse	5000W (5kW)
Bidirectional Channels	1
Type	Zener
Mounting Type	Through Hole
Package / Case	P600, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 5KP28C-B is determined by the following critical parameters:

Voltage Rating: Reverse standoff voltage of 28V and breakdown voltage minimum of 29.48V
Power Dissipation: 5000W peak pulse power rating
Package Configuration: P600 axial through-hole package for direct mechanical compatibility
Bidirectional Operation: Single bidirectional channel for symmetric overvoltage protection
Temperature Range: Operating range of -55°C to 175°C

Substitute parts are grouped into two categories based on package type compatibility:

Category 1 - P600 Package (Direct Mechanical Replacement): Parts maintaining the P600 axial package enable direct board-level substitution without layout modifications.

Category 2 - Alternative Package (R-6): Parts with different package geometry require board redesign but maintain electrical equivalence.

Parameter Comparison

Parameter	5KP28C-B (Main)	5KP28CA	5KP28CA-B	SLD28-018-B	5KP28CE3/TR13	15KP28CA-TP
Manufacturer	Littelfuse	Diotec Semiconductor	Littelfuse Inc.	Littelfuse	Microchip Technology	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	28V	28V	28V	28V	28V	28V
Voltage - Breakdown (Min)	29.48V	31.1V	31.1V	31.1V	31.1V	31.1V
Voltage - Clamping (Max) @ Ipp	47.67V	45.4V	45.4V	45.4V	50V	47.5V
Power - Peak Pulse	5000W	5000W	5000W	5000W	5000W	15000W
Package / Case	P600, Axial	P600, Axial	P600, Axial	P600, Axial	P600, Axial	R-6, Axial
Operating Temperature	-55°C ~ 175°C	-50°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not applicable	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (P600 Package - Direct Replacement)

The 5KP28CA-B, 5KP28CA, and 5KP28CE3/TR13 are functionally equivalent to the 5KP28C-B with identical P600 axial packaging. All three maintain the 28V reverse standoff voltage and 5000W power rating. The 5KP28CA-B and SLD28-018-B are Littelfuse products with ROHS3 compliance and identical temperature operating range (-55°C to 175°C), providing direct electrical and mechanical compatibility. The 5KP28CE3/TR13 from Microchip Technology offers equivalent performance with ROHS3 compliance and maintains full temperature range specification.

Secondary Substitute (Alternative Package - R-6)

The 15KP28CA-TP from Micro Commercial Co provides higher power dissipation (15000W versus 5000W) with R-6 axial packaging. This part requires board layout modification due to different package geometry but offers enhanced thermal performance for applications requiring greater transient energy absorption.

Compliance Considerations

All active substitute parts carry ROHS3 compliance certification. The SLD28-018-B includes AEC-Q101 automotive qualification, suitable for automotive-grade applications. Selection should prioritize parts with active product status and established supply availability.

Frequently Asked Questions (FAQ)

Q: Can the 5KP28CA-B directly replace the 5KP28C-B without board modifications?

A: Yes. The 5KP28CA-B maintains identical P600 axial package geometry, 28V reverse standoff voltage, and 5000W power rating. Direct board-level substitution is possible without layout changes.

Q: What is the difference between the 5KP28CA and 5KP28CA-B?

A: Both parts are electrically equivalent with 28V standoff voltage and 5000W power rating in P600 packages. The primary difference is packaging format: 5KP28CA is supplied in Tape & Reel, while 5KP28CA-B is supplied in Bulk. Selection depends on procurement and assembly requirements.

Q: Why does the 15KP28CA-TP have a different power rating?

A: The 15KP28CA-TP is rated for 15000W peak pulse power compared to 5000W for the main part. This higher rating provides greater transient energy absorption capability. However, the R-6 package differs from the P600, requiring board redesign for implementation.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed carry ROHS3 compliance certification. The 5KP28CA from Diotec Semiconductor shows "Not applicable" RoHS status due to manufacturer classification, but remains functionally suitable for general-purpose applications.

Q: What is the operating temperature difference between substitutes?

A: The 5KP28CA has a minimum operating temperature of -50°C compared to -55°C for other parts. For applications requiring full -55°C operation, select 5KP28CA-B, SLD28-018-B, 5KP28CE3/TR13, or 15KP28CA-TP.

Q: Is the SLD28-018-B suitable for automotive applications?

A: Yes. The SLD28-018-B carries AEC-Q101 automotive qualification and ROHS3 compliance, making it suitable for automotive-grade circuit protection applications.

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